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] This disclosure is based on Chinese patent application number 202420096151.0, application date January 15, 2024, and invention name “A liquid injection device and production line”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into the present disclosure as a reference. Technical Field

[0003] The present disclosure relates to the field of battery technology, and in particular to a liquid injection device and a production line. Background Art

[0004] Batteries are increasingly being used in everyday life and production. For example, new energy vehicles equipped with batteries are already widely used, and batteries can be used to fully or partially power these vehicles. Furthermore, batteries are increasingly being used in areas such as energy storage.

[0005] The battery includes at least one battery cell. During 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, which is connected to the internal cavity of the battery cell. It is usually necessary to first evacuate the liquid injection cup and the internal cavity of the battery cell, and then inject the electrolyte into the liquid injection cup, and then inject it into the internal cavity of the battery cell through the liquid injection cup. Since the liquid injection operation can only be carried out after the vacuum operation is completed, the liquid injection time is long and the production efficiency is low.

[0006] Utility Model Content

[0007] In view of this, the embodiments of the present disclosure hope to provide a liquid injection device and a production line that can shorten the liquid injection time and improve production efficiency.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present disclosure is implemented as follows:

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

[0010] Vacuum air circuit;

[0011] The first-level cup is formed with multiple mutually isolated buffer cavities;

[0012] The secondary cup is formed with a plurality of mutually isolated liquid injection cavities, each of which is connected to the vacuum air path;

[0013] A plurality of injection liquid paths, each of the injection liquid paths being connected to one of the buffer chambers;

[0014] 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.

[0015] The liquid injection device provided in the disclosed embodiments, on the one hand, utilizes a vacuum air circuit, a first-stage cup, a second-stage cup, multiple liquid injection circuits, and multiple liquid flow components to simultaneously prepare liquid and evacuate the battery. This solves the problem of prioritizing vacuuming and then injecting liquid, which results in long injection times, in the related art, and improves production efficiency. Furthermore, the first-stage cup forms multiple, mutually isolated buffer chambers, and the second-stage cup forms multiple, mutually isolated injection chambers. Multiple liquid flow components can be connected and disconnected to each buffer chamber and injection chamber. Thus, a single liquid injection device can inject liquid into multiple battery cells, further improving production efficiency.

[0016] In some embodiments, the liquid injection device includes a primary air circuit, and each of the buffer chambers is connected to the primary air circuit.

[0017] In this embodiment, after the liquid preparation and vacuuming are completed, each buffer cavity can be kept at a slightly positive pressure or normal pressure through the primary gas path, so that the electrolyte in the buffer cavity can smoothly enter the liquid injection cavity.

[0018] In some embodiments, the primary gas circuit includes:

[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 air pipe is communicated with the main air port.

[0021] In this embodiment, a first-level confluence channel can be connected to all cache cavities, and pressurization or decompression of all cache cavities can be achieved through a main air pipe and a confluence channel, which not only saves pipelines and reduces costs, but also reduces the difficulty of pipeline laying.

[0022] In some embodiments, the primary bus bar is disposed on the top of the primary cup.

[0023] In this embodiment, the height of the primary bus bar is higher than the height of the cache cavity, which can prevent the electrolyte in the cache cavity from entering the primary bus channel as much as possible.

[0024] In some embodiments, the liquid injection device includes a plurality of second switch members, and the vacuum air circuit includes:

[0025] 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;

[0026] A main gas pipe is communicated with the main gas port.

[0027] In this embodiment, a second switch is provided for each liquid injection cavity. This second switch switches the airflow path between each liquid injection cavity and the secondary converging channel, enabling more precise control of the vacuum level in each liquid injection cavity, thereby improving reliability. Furthermore, each secondary converging channel is connected to a single main gas pipe, saving piping and reducing costs while also simplifying piping layout.

[0028] In some embodiments, the secondary bus is disposed on the top of the secondary cup.

[0029] In this embodiment, the height of the secondary bus bar is higher than the height of the liquid injection cavity, which can prevent the liquid in the liquid injection cavity from entering the secondary bus channel as much as possible.

[0030] In some embodiments, the height of the primary cup is higher than the height of the secondary cup.

[0031] In this embodiment, after the liquid preparation and vacuuming are completed, the electrolyte in the buffer chamber can enter the liquid injection chamber under the action of gravity, reducing the resistance during the flow of the electrolyte and improving the liquid injection efficiency.

[0032] In some embodiments, the liquid injection device includes a third switch element corresponding one-to-one to the liquid injection path, and the third switch element is arranged in the liquid injection path to selectively open or close the liquid injection path.

[0033] In this embodiment, the amount of electrolyte entering the cache cavity can be more accurately controlled by the third switch component, and the injection path can be cut off by the third switch component when there is no need to inject electrolyte into the cache cavity.

[0034] In some embodiments, the liquid injection device includes a plurality of fourth switch components and a plurality of liquid injection nozzles arranged on the secondary cup, each of the liquid injection chambers is connected to one of the liquid injection nozzles, and a fourth switch component is arranged between the liquid injection chamber 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 chamber and the corresponding liquid injection nozzle.

[0035] In this embodiment, before the liquid injection chamber is evacuated, a fourth switch can be used to block the liquid flow path between the liquid injection chamber and the corresponding liquid injection nozzle, thereby facilitating rapid vacuuming of the liquid injection chamber. While the electrolyte in the liquid injection chamber is entering the internal cavity of the battery cell, the fourth switch opens the liquid flow path between the liquid injection chamber and the corresponding liquid injection nozzle. After the liquid injection is completed, the fourth switch can be used to block the liquid flow path between the liquid injection chamber and the corresponding liquid injection nozzle again, preventing external air from entering the liquid injection chamber through the liquid injection nozzle.

[0036] An embodiment of the present disclosure also provides a production line for producing batteries, comprising any one of the liquid injection devices described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic structural diagram of a liquid injection device in one embodiment of the present disclosure;

[0038] FIG2 is a schematic structural diagram of the structure shown in FIG1 from another perspective;

[0039] FIG3 is an enlarged schematic diagram of point A in FIG1 .

[0040] Description of Reference Numerals

[0041] Vacuum air circuit 1; secondary bus 11; main air pipe 12; primary cup 2; secondary cup 3; liquid injection circuit 4; liquid flow assembly 5; liquid flow channel 51; first switch member 52; primary air circuit 6; primary bus 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 following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection 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 this disclosure belongs. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this disclosure.

[0044] In the description of the embodiments of the present disclosure, technical terms such as "first" and "second" 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] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] The liquid injection device and production line provided in the embodiments of the present disclosure are both used for battery production. To clearly describe the liquid injection device and production line in the embodiments of the present disclosure, the battery in the embodiments of the present disclosure is first introduced.

[0047] The batteries provided in the embodiments of the present disclosure can be used individually. Multiple batteries can also be grouped together to form a battery pack. The batteries and battery packs can be used in, but are not limited to, electrical devices. Electrical devices include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, vehicles, ships, or spacecraft. Spacecraft may include aircraft, rockets, space shuttles, and spacecraft.

[0048] Taking the electric device of one embodiment of the present disclosure as a vehicle as an example, the vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery is provided inside the vehicle, and the battery can be provided at the bottom of the vehicle or at the front or rear of the vehicle. The battery can be used to power the vehicle, for example, the battery can serve as the operating power source of the vehicle. In some embodiments, the battery can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0049] The battery may be a lithium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, or a lithium-sulfur battery, etc., which is not limited in the embodiments of the present disclosure.

[0050] A battery includes at least one cell. A cell is the battery's energy storage component. The battery also includes a battery monitoring and management device, which monitors the cell's charge level and other parameters.

[0051] In a battery, there can be multiple cells, which can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple cells can be directly connected in series, in parallel, or in a hybrid configuration. Of course, a battery can also be constructed by first connecting multiple cells in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a complete battery.

[0052] In the embodiment of the present disclosure, the battery cell may be a secondary battery cell, which refers to a battery cell that can be recharged to activate the active material after being discharged and can be used continuously.

[0053] The battery cell may be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include square shell battery cells or polygonal prismatic battery cells, and the polygonal prismatic battery cells are, for example, hexagonal prismatic battery cells, etc., and there is no particular limitation in the present disclosure.

[0054] The internal cavity of the battery cell is used to house the electrode assembly and electrolyte. For example, the battery cell includes a housing, an electrode assembly, and an electrolyte. The housing defines an internal cavity, and the electrode assembly and electrolyte are housed within the housing. The housing is used to encapsulate components such as the electrode assembly and electrolyte.

[0055] Please refer to Figure 1. An embodiment of the present disclosure provides a liquid injection device, which includes a vacuum air circuit 1, a first-level cup 2, a second-level cup 3, multiple liquid injection circuits 4 and multiple liquid flow components 5.

[0056] The first-stage cup 2 is formed with multiple, isolated cache cavities. Each injection path 4 connects to a cache cavity. The injection path 4 is used to inject liquid, such as electrolyte, into the corresponding connected cache cavity. The electrolyte in each cache cavity cannot flow between them.

[0057] The secondary cup 3 is formed with a plurality of mutually isolated liquid injection chambers, each of which is connected to a vacuum air circuit 1. The vacuum air circuit 1 is used to evacuate each liquid injection chamber. The electrolyte in each liquid injection chamber cannot flow into or out of each other.

[0058] Referring to Figure 1 , the liquid flow assembly 5 , the buffer chamber, and the liquid injection chamber are arranged in a one-to-one correspondence. The liquid flow assembly 5 includes a liquid passage 51 and a first switch 52. The liquid passage 51 connects one buffer chamber and one liquid injection chamber. The first switch 52 is disposed in the liquid passage 51 to selectively open or close the liquid passage 51. In other words, one buffer chamber and one liquid injection chamber form a pair. Each liquid flow assembly 5 corresponds to a pair of buffer and injection chambers, and the liquid passage 51 connects the two.

[0059] Exemplarily, when it is necessary to inject liquid into the battery cell, the liquid injection chamber is connected to the internal cavity of the battery cell, and the first switch 52 is in a state of cutting off the liquid passage 51, so that gas and liquid cannot circulate between the liquid injection chamber and the cache chamber. Each liquid injection chamber and the internal cavity of the battery cell can be evacuated by the vacuum air circuit 1, and at the same time, electrolyte is injected into the cache cavity through the injection liquid circuit 4, so that liquid preparation and vacuuming are carried out simultaneously. After the liquid preparation and vacuuming are completed, the liquid injection step is entered, and the liquid injection step includes: the first switch 52 is switched to a state of conducting the liquid passage 51, and the electrolyte prepared in the cache cavity can enter the liquid injection chamber through the liquid passage 51, and then enter the internal cavity of the battery cell through the liquid injection chamber to complete the liquid injection.

[0060] It can be understood that each injection cavity is connected to the internal cavity of a battery cell. Therefore, multiple injection cavities can be used to inject liquid into multiple battery cells. The injection of multiple battery cells can be carried out simultaneously or separately according to needs.

[0061] The liquid injection device provided in the embodiment of the present disclosure, on the one hand, can achieve simultaneous liquid preparation and vacuuming through the vacuum air circuit 1, the first-level cup 2, the second-level cup 3, multiple injection liquid circuits 4, and multiple liquid flow components 5. This solves the problem of long liquid injection time caused by vacuuming first and then injecting liquid in the related art, can shorten the liquid injection time, and improve production efficiency. On the other hand, the first-level cup 2 forms multiple mutually isolated buffer chambers, and the second-level cup 3 forms multiple mutually isolated injection chambers. The multiple liquid flow components 5 can be connected to each buffer chamber and injection chamber in a disconnectable manner. In this way, a single liquid injection device can inject liquid into multiple battery cells, further improving production efficiency.

[0062] The type of the liquid passage 51 is not limited. For example, the liquid passage 51 may be formed by a pipe.

[0063] The first switch 52 can be an electrically controlled valve, for example, including but not limited to a membrane plug valve. In this way, the opening and closing of the first switch 52 can be controlled by the control circuit, thereby controlling the opening and closing of the liquid passage 51, with a high degree of automation.

[0064] In some embodiments, referring to FIG1 , the liquid injection device includes a primary air circuit 6 , with each cache cavity being connected to the primary air circuit 6 . The primary air circuit 6 is used to regulate the air pressure within each cache cavity. For example, the primary air circuit 6 can be used to pressurize or depressurize the cache cavity.

[0065] In this embodiment, after the liquid preparation and vacuuming are completed, each buffer cavity can be kept at a slightly positive pressure or normal pressure through the primary gas path 6, so that the electrolyte in the buffer cavity can smoothly enter the liquid injection cavity.

[0066] In one embodiment, referring to Figures 1 to 3 , the primary gas circuit 6 includes a primary busbar 61 and a main gas pipe 62. The primary busbar 61 defines a primary converging channel and a main gas port connected to the primary converging channel. Each buffer cavity is connected to the primary converging channel. The main gas pipe 62 is connected to the main gas port.

[0067] In this embodiment, a first-level confluence channel can be connected to all cache cavities, and pressurization or decompression of all cache cavities can be achieved through a main air pipe 62 and a confluence channel, which not only saves pipelines and reduces costs, but also reduces the difficulty of pipeline laying.

[0068] For example, in one embodiment, the liquid injection device includes an air pump connected to the main air pipe 62 and a fifth switch member disposed on the main air pipe 62 to selectively open or close the air path within the main air pipe 62. A single air pump can supply air to multiple buffer chambers via the main air pipe 62 and the primary bus 61.

[0069] In one embodiment, referring to Figures 1 to 3 , a primary busbar 61 is disposed on the top of the primary cup 2. Specifically, the top of the primary cup 2 is formed with multiple vents, each of which communicates with a buffer cavity, and the primary busbar channels are connected to the vents. The height of the primary busbar 61 is higher than the height of the buffer cavity, minimizing the risk of electrolyte in the buffer cavity entering the primary busbar channels.

[0070] In one embodiment, referring to FIG. 1 , the liquid injection device includes a plurality of second switch members 7 , and the vacuum air circuit 1 includes a secondary bus 11 and a main air pipe 12 .

[0071] The secondary busbar 11 is formed with a secondary bus channel and a main gas port connected to the secondary bus channel. Each injection cavity is connected to the secondary bus channel. Each injection cavity is provided with a corresponding second switch 7, which selectively opens or closes the airflow path between the corresponding injection cavity and the secondary bus channel. The main gas pipe 12 is connected to the main gas port.

[0072] In this embodiment, a second switch 7 is provided for each liquid injection cavity. This second switch 7 switches the airflow path between each liquid injection cavity and the secondary converging channel, enabling more precise control of the vacuum level in each liquid injection cavity, thereby improving reliability. Furthermore, each secondary converging channel is connected to a single main air pipe 12, saving piping and reducing costs while also simplifying piping layout.

[0073] The second switch element 7 can be an electrically controlled valve. For example, the second switch element 7 includes but is not limited to a piston valve. In this way, it is convenient to control the on and off of the second switch element 7 through the control circuit, and the degree of automation is high.

[0074] For example, in one embodiment, the liquid injection device includes a vacuum air source connected to the main air pipe 12. One vacuum air source can evacuate multiple liquid injection chambers through the main air pipe 12 and the secondary bus 11.

[0075] Vacuum gas sources include, but are not limited to, vacuum pumps.

[0076] In one embodiment, referring to Figures 1 and 2 , a secondary busbar 11 is disposed on the top of the secondary cup 3. Specifically, a gas port is formed on the top of the secondary cup 3, communicating with the liquid injection chamber. The secondary busbar 11 is connected to the gas port. This ensures that the height of the secondary busbar 11 is higher than the height of the liquid injection chamber, minimizing the risk of liquid in the liquid injection chamber entering the secondary busbar.

[0077] In one embodiment, referring to Figures 1 and 2 , the height of the primary cup 2 is higher than that of the secondary cup 3. For example, the primary cup 2 can be positioned above the secondary cup 3. After the electrolyte preparation and vacuum pumping are complete, the electrolyte in the buffer chamber can flow into the injection chamber under the action of gravity, reducing resistance during electrolyte flow and improving injection efficiency.

[0078] It should be noted that "down" refers to the direction toward the ground, and "up" refers to the opposite direction of "down." Top is in the same direction as "up," and bottom is in the same direction as "down."

[0079] In one embodiment, referring to Figures 1 to 3 , the liquid injection device includes a third switch 8 corresponding one-to-one with each injection path 4. The third switch 8 is disposed on the injection path 4 to selectively open or close the injection path 4. This allows for more precise control of the amount of electrolyte entering the buffer chamber via the third switch 8 , and also facilitates closing the injection path 4 via the third switch 8 when no electrolyte injection into the buffer chamber is required.

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

[0081] In one embodiment, the liquid injection device includes an electrolyte pump, which is connected to the liquid injection path 4 to pump the electrolyte.

[0082] In one embodiment, referring to Figures 1 and 2, the liquid injection device includes a plurality of fourth switch members 9 and a plurality of liquid injection nozzles 10 provided on the secondary cup 3. Each liquid injection cavity is connected to a liquid injection nozzle 10. A fourth switch member 9 is provided between the liquid injection cavity and the corresponding liquid injection nozzle 10. The fourth switch member 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 chamber is evacuated, the fourth switch 9 can be used to block the liquid flow path between the liquid injection chamber and the corresponding liquid injection nozzle 10, thereby facilitating rapid vacuuming of the liquid injection chamber. While the electrolyte in the liquid injection chamber is entering the internal cavity of the battery cell, the fourth switch 9 conducts the liquid flow path between the liquid injection chamber and the corresponding liquid injection nozzle 10. After the liquid injection is completed, the fourth switch 9 can be used to block the liquid flow path between the liquid injection chamber and the corresponding liquid injection nozzle 10 again, preventing external air from entering the liquid injection chamber through the liquid injection nozzle 10.

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

[0086] In one embodiment, referring to Figures 1 and 2, the liquid injection nozzle 10 is located at the bottom of the secondary cup 3. This facilitates the flow of electrolyte under the action of gravity and reduces flow resistance.

[0087] In a specific embodiment, referring to Figures 1 to 3, the liquid injection device includes a vacuum air circuit 1, a first-level air circuit 6, a first-level cup 2, a second-level cup 3, multiple liquid injection circuits 4, multiple liquid flow components 5, multiple second switch components 7, a third switch component 8, multiple fourth switch components 9, multiple liquid injection nozzles 10 and a fifth switch component.

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

[0089] When liquid needs to be injected into the internal cavity of the battery cell, the injection port of the battery cell is sealed with the injection nozzle 10. The preparation and vacuuming steps are first performed, specifically including: the second switch 7 is opened to open the vacuum air path 1, and the vacuum air source is activated to evacuate both the injection cavity and the internal cavity of the battery cell. Simultaneously, the third switch 8 is opened to open the injection path 4, and the electrolyte pump is activated to pump electrolyte into the buffer cavity. In this way, preparation and vacuuming are performed simultaneously. After the preparation and vacuuming are completed, the injection step is performed, specifically including: the second switch 7 is closed to block the vacuum air path 1, the first air path 6 supplies air to the buffer cavity to switch the buffer cavity to normal pressure, the first switch 52 is opened to open the liquid passage 51, and the fourth switch 9 is opened to open the liquid flow path between the injection cavity and the corresponding injection nozzle 10. The electrolyte in the buffer cavity flows through the liquid passage 51, the injection cavity, and the injection nozzle 10 in sequence, ultimately entering the internal cavity of the battery cell. In this way, the battery cell is injected.

[0090] An embodiment of the present disclosure further provides a production line, which includes the liquid injection device according to any one of the embodiments of the present disclosure.

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

[0092] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A liquid injection device, comprising: A vacuum pumping air path; A first - stage cup, formed with a plurality of mutually isolated buffer chambers; A second - stage cup, formed with a plurality of mutually isolated liquid injection chambers, and each of the liquid injection chambers is communicated with the vacuum pumping air path; A plurality of liquid injection paths, each of the liquid injection paths communicating with one of the buffer chambers; A plurality of liquid - conducting components, the liquid - conducting components, the buffer chambers and the liquid injection chambers are arranged in one - to - one correspondence. The liquid - conducting component includes a liquid - conducting channel and a first switching member. The liquid - conducting channel communicates one of the buffer chambers and one of the liquid injection chambers, and the first switching member is arranged in the liquid - conducting channel to selectively conduct or cut off the liquid - conducting channel.

2. The liquid injection device according to claim 1, wherein, The liquid injection device includes a first - stage air path, and each of the buffer chambers is communicated with the first - stage air path.

3. The liquid injection device according to claim 2, wherein, The first - stage air path includes: A first - stage manifold, formed with a first - stage manifold channel and a main air port communicated with the first - stage manifold channel, and each of the buffer chambers is communicated with the first - stage manifold channel; A main air pipe, communicated with the main air port.

4. The liquid injection device according to claim 3, wherein, The first - stage manifold is arranged on the top of the first - stage cup.

5. The liquid injection device according to claim 3, wherein, The liquid injection device includes an air pump and a fifth switching member. The air pump is connected to the main air pipe, and the fifth switching member is arranged in the main air pipe to selectively conduct or cut off 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 switching members. The vacuum pumping air path includes: A second - stage manifold, formed with a second - stage manifold channel and a total Air port, each of the liquid injection chambers is communicated with the second - stage manifold channel, and each of the liquid injection chambers is provided with a corresponding second switching member. The second switching member is used to selectively conduct or cut off the air flow path between the corresponding liquid injection chamber and the second - stage manifold channel; A total air pipe, communicated with the total air port.

7. The liquid injection device according to claim 6, wherein, The second switching member is an electromagnetic control valve.

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

9. The liquid injection device according to claim 6, wherein, The second - stage manifold is arranged on the top of the second - stage cup.

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

11. The liquid injection device according to any one of claims 1 to 10, wherein, The liquid injection device includes a third switching member corresponding to each of the liquid injection paths. The third switching member is arranged in the liquid injection path to selectively conduct or cut off the liquid injection path.

12. The liquid injection device according to claim 11, wherein, The third switching member is an electromagnetic control valve.

13. The liquid injection device according to any one of claims 1 to 12, wherein, The liquid injection device includes a plurality of fourth switching members and a plurality of liquid injection nozzles arranged on the second - stage cup. Each of the liquid injection chambers is communicated with one of the liquid injection nozzles, and a fourth switching member is arranged between the liquid injection chamber and the corresponding liquid injection nozzle. The fourth switching member is used to selectively conduct or cut off the liquid flow path between the liquid injection chamber and the corresponding liquid injection nozzle.

14. The liquid injection device according to claim 13, wherein, The fourth switching member is an electromagnetic control valve.

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

16. The liquid injection device according to any one of claims 1 to 15, wherein, The first switching member is an electromagnetic control valve.

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