Battery liquid injection device and battery liquid injection equipment

Abstract

The utility model provides a battery liquid injection device and battery liquid injection equipment, and belongs to the technical field of batteries. The battery liquid injection device comprises a first liquid injection cup, a second liquid injection cup, a third liquid injection cup and a fourth liquid injection cup, the first liquid outlet is used for the electrolyte to flow out of the first liquid injection cup; the second liquid inlet is used for the backflow electrolyte to flow into the first liquid injection cup; the second liquid injection cup is used for being in fluid communication with the first liquid injection cup, and the second liquid injection cup comprises a third liquid inlet used for allowing the backflow electrolyte to flow into the second liquid injection cup; the second liquid outlet is used for enabling the refluxed electrolyte to flow out of the second liquid injection cup; the first connecting pipeline is used for connecting the first liquid outlet with a liquid injection hole of the battery; the second connecting pipeline is used for connecting the first connecting pipeline with the third liquid inlet; and the second connecting pipeline is used for connecting the second liquid outlet and the second liquid inlet.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery liquid filling device and a battery liquid filling equipment. Background Art

[0002] The production process of lithium batteries is very complex and includes multiple processes. Formation is an important part of the process that cannot be ignored. It has a crucial impact on the performance of lithium batteries. Lithium battery formation is the first charging process of lithium batteries after lithium batteries are filled with liquid. This process can activate the active substances in lithium batteries and activate lithium batteries.

[0003] The negative pressure formation method currently used tends to draw in electrolyte while exhausting the gas, and drawing in too much electrolyte often leads to the problem of insufficient reaction electrolyte during the formation process. Utility Model Content

[0004] In view of the above problems, the present application provides a battery filling device and a battery filling equipment, aiming to alleviate, reduce or eliminate the problem of insufficient reaction electrolyte during the formation process caused by the negative pressure formation method which easily sucks the electrolyte while exhausting the gas.

[0005] In a first aspect, the present application provides a battery filling device, comprising: a first filling cup, comprising: a first liquid inlet, for electrolyte to flow into the first filling cup; a first liquid outlet, for electrolyte to flow out of the first filling cup; and a second liquid inlet, for supplying refluxed electrolyte to flow into the first filling cup; a second filling cup, for being fluidly connected to the first filling cup, the second filling cup comprising: a third liquid inlet, for supplying refluxed electrolyte to flow into the second filling cup; and a second liquid outlet, for supplying refluxed electrolyte to flow out of the second filling cup; a first connecting pipeline, for connecting the first liquid outlet with the filling hole of the battery; a second connecting pipeline, for connecting the first connecting pipeline with the third liquid inlet; and a third connecting pipeline, for connecting the second liquid outlet with the second liquid inlet.

[0006] In the technical solution of the embodiment of the present application, by using a liquid injection cup with two cavities interconnected with each other, it is possible to alleviate, reduce or eliminate the problem of insufficient reaction electrolyte in the formation process caused by the negative pressure formation method that easily draws electrolyte while exhausting. For example, when the negative pressure is drawn, the electrolyte can flow through one of the two liquid injection cups and overflow to the other of the two liquid injection cups, thereby increasing the amount of electrolyte retained in the battery, thereby reducing the possibility of insufficient reaction electrolyte.

[0007] In some embodiments, a first valve is provided on the first connecting pipeline, and the first valve is located upstream of the connection between the second connecting pipeline and the first connecting pipeline along the flow direction of the electrolyte flowing out of the first liquid outlet. By providing the first valve, it is possible to control whether the channel in the first connecting pipeline, that is, the passage from the first liquid outlet to the injection hole of the battery, is open.

[0008] In some embodiments, the first valve includes a one-way valve to achieve one-way communication from the first liquid outlet to the liquid injection hole of the battery. In such a design, the channel in the first connecting pipeline, that is, the passage from the first liquid outlet to the liquid injection hole of the battery, can be one-way communicated, thereby reducing the possibility of electrolyte flowing from the liquid injection hole of the battery to the first liquid outlet.

[0009] In some embodiments, a second valve is provided on the second connecting pipeline. By providing the second valve, it is possible to control whether the channel in the second connecting pipeline, that is, the passage from the first connecting pipeline to the third liquid inlet is open.

[0010] In some embodiments, the second valve includes a one-way valve to achieve one-way communication from the first connecting pipeline to the third liquid inlet. In such a design, the channel in the second connecting pipeline, that is, the passage from the first connecting pipeline to the third liquid inlet, can be one-way communicated, thereby reducing the possibility of electrolyte flowing from the third liquid inlet to the first connecting pipeline.

[0011] In some embodiments, a filter is disposed inside the second liquid injection cup to filter the refluxed electrolyte. In such a design, impurities in the electrolyte flowing through the second liquid injection cup when negative pressure is drawn can be filtered.

[0012] In some embodiments, the filter element is arranged near the second liquid outlet. In such a design, the electrolyte flowing back to the second liquid injection cup can be more fully filtered.

[0013] In some embodiments, the second liquid inlet is arranged at a position higher than half the height of the first liquid filling cup, and / or the second liquid outlet is arranged at a position higher than half the height of the second liquid filling cup. By arranging the connecting portion of the two cavities to be higher than half the height of the liquid filling cup, the excess electrolyte can overflow into the first liquid filling cup only when the liquid level of the electrolyte in the second liquid filling cup is higher.

[0014] In some embodiments, the battery injection device further includes: a fourth connecting pipeline for connecting the first liquid inlet with the electrolyte storage tank. By providing the fourth connecting pipeline, the first liquid inlet of the first injection cup can be connected to the electrolyte storage tank to introduce the electrolyte in the storage tank into the first injection cup.

[0015] In some embodiments, the second liquid injection cup further includes: a third liquid outlet for discharging the waste electrolyte from the second liquid injection cup. By providing the third liquid outlet on the second liquid injection cup, the waste electrolyte can be discharged from the second liquid injection cup regularly.

[0016] In some embodiments, the battery injection device further includes: a fifth connecting pipeline for connecting the third liquid outlet with the electrolyte collection device. In such a design, the waste electrolyte can be further discharged from the second injection cup to the electrolyte collection device for further processing.

[0017] In a second aspect, the present application provides a battery filling device, including an electrolyte storage tank and at least one battery filling device in the above-mentioned embodiment, the battery filling device is used to fill the battery through the battery's filling hole.

[0018] Such a battery filling device can provide the advantages described above with respect to the battery filling apparatus, which will not be described in detail for the sake of brevity.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0021] Figure 1 A schematic diagram of the structure of a battery liquid filling device according to some embodiments of the present application;

[0022] Figure 2 for Figure 1 A top view of a battery filling device;

[0023] Figure 3 For along Figure 2 A rotated cross-sectional view of the battery liquid filling device cut along the cross-sectional line CC;

[0024] Figure 4 This is a schematic diagram of the structure of a battery filling device according to some embodiments of the present application.

[0025] The reference numerals in the specific implementation manner are as follows:

[0026] A battery liquid injection device 100, a first liquid injection cup 110, a second liquid injection cup 120, a first connecting pipeline 130, a second connecting pipeline 140, a third connecting pipeline 150, a first liquid inlet 160, a first liquid outlet 170, a second liquid inlet 180, and a third liquid inlet 190;

[0027] The second liquid outlet 200, the liquid injection hole 210, the first valve 220, the second valve 230, the filter 240, the fourth connecting pipeline 250, the storage tank 260, the third liquid outlet 270, the fifth connecting pipeline 280, and the battery 290;

[0028] Battery filling equipment 400. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the description of the embodiments of the present application, 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. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0035] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] In the description of the embodiment of the present application, a flow chart is used to illustrate the operations performed by the system according to the embodiment of the present disclosure. It should be understood that the preceding or following operations are not necessarily performed precisely in order. On the contrary, the various steps may be processed in reverse order or simultaneously. At the same time, other operations may also be added to these processes, or one or more operations may be removed from these processes.

[0038] Currently, lithium batteries are activated by activating active substances in lithium batteries through chemical formation.

[0039] The negative pressure formation method currently used can easily draw out electrolyte while exhausting air, that is, it does not hinder the extraction of electrolyte in the battery during the formation process. However, extracting too much electrolyte will often lead to insufficient reaction electrolyte during the formation process, which in turn affects the performance of the battery and may cause battery abnormalities and loss and waste of electrolyte.

[0040] In order to alleviate, mitigate or eliminate the problem of insufficient reaction electrolyte during the formation process caused by the easy suction of electrolyte during the exhaust of the negative pressure formation method, a liquid injection cup with two interconnected cavities can be used. For example, when the negative pressure is drawn, the electrolyte can flow through one of the two liquid injection cups and overflow to the other of the two liquid injection cups, thereby increasing the amount of electrolyte retained in the battery, thereby reducing the possibility of insufficient reaction electrolyte.

[0041] Based on the above considerations, a battery filling device is designed. By adopting a filling cup with two interconnected cavities, the problem of insufficient reaction electrolyte during the formation process caused by the negative pressure formation method that easily sucks the electrolyte while exhausting the gas is alleviated, reduced or eliminated.

[0042] The battery liquid injection device disclosed in the embodiment of the present application can be used to inject liquid into a battery. A battery liquid injection device equipped with the battery liquid injection device disclosed in the present application can be used.

[0043] Reference Figure 1 , and please refer to Figures 2 to 3 . Figure 1 A schematic diagram of the structure of a battery liquid filling device 100 according to some embodiments of the present application; Figure 2 for Figure 1 A top view of a battery liquid filling device 100; Figure 3 For along Figure 2 A rotated cross-sectional view of a battery filling device 100 cut along a section line CC of the battery filling device 100. The battery filling device 100 includes a first filling cup 110, a second filling cup 120, a first connecting pipeline 130, a second connecting pipeline 140 and a third connecting pipeline 150. The first filling cup 110 includes: a first liquid inlet 160, a first liquid outlet 170 and a second liquid inlet 180. The first liquid inlet 160 is used for electrolyte to flow into the first filling cup 110. The first liquid outlet 170 is used for electrolyte to flow out of the first filling cup 110. The second liquid inlet 180 is used for supplying refluxed electrolyte into the first filling cup 110. The second filling cup 120 is used to be in fluid communication with the first filling cup 110. The second filling cup 120 includes a third liquid inlet 190 and a second liquid outlet 200. The third liquid inlet 190 is used for supplying refluxed electrolyte into the second filling cup 120. The second liquid outlet 200 is used for the refluxed electrolyte to flow out of the second liquid filling cup 120. The first connecting pipeline 130 is used to connect the first liquid outlet 170 with the liquid filling hole 210 of the battery 290. The second connecting pipeline 140 is used to connect the first connecting pipeline 130 with the third liquid inlet 190. The third connecting pipeline 150 is used to connect the second liquid outlet 200 with the second liquid inlet 180.

[0044] exist Figure 1In the example shown, the first liquid injection cup 110 and the second liquid injection cup 120 are fluidically connected to each other via a third connecting pipe 150. In some embodiments, the first liquid injection cup 110 can be placed at the same height as the second liquid injection cup 120. However, it is understood that the first liquid injection cup 110 can also be placed at a different height from the second liquid injection cup 120, and the present disclosure is not limited to this. In some embodiments, the first liquid injection cup 110 can have the same capacity as the second liquid injection cup 120. However, it is understood that the first liquid injection cup 110 can also have a different capacity from the second liquid injection cup 120, and the present disclosure is not limited to this.

[0045] like Figure 1 As shown, the first connecting line 130 connects the first liquid outlet 170 of the first liquid filling cup 110 with the liquid filling hole 210 of the battery 290. The second connecting line 140 branches off from the first connecting line 130 and extends from the first connecting line 130 to the third liquid inlet 190 of the second liquid filling cup 120.

[0046] By using a liquid injection cup with two interconnected cavities, it is possible to alleviate, reduce or eliminate the problem of insufficient reaction electrolyte during the formation process caused by the negative pressure formation method that easily draws electrolyte while exhausting. For example, when drawing negative pressure, the electrolyte can flow through the second liquid injection cup 120 and overflow to the first liquid injection cup 110, thereby increasing the amount of electrolyte retained in the battery, thereby reducing the possibility of insufficient reaction electrolyte.

[0047] Please continue to refer to Figure 1 According to some embodiments of the present application, a first valve 220 is disposed on the first connecting pipeline 130 . The first valve 220 is located upstream of the connection between the second connecting pipeline 140 and the first connecting pipeline 130 along the flow direction of the electrolyte flowing out of the first liquid outlet 170 .

[0048] like Figure 1 As shown, the electrolyte flows out of the first liquid outlet 170 in a vertically downward direction. In some embodiments, the first valve 220 may include a stop valve, a plunger valve, etc., which is not limited in the present disclosure.

[0049] By setting the first valve, it is possible to control whether the channel in the first connecting pipeline, that is, the passage from the first liquid outlet to the liquid injection hole of the battery is open.

[0050] Please refer to further Figure 3 According to some embodiments of the present application, the first valve 220 includes a one-way valve to achieve one-way conduction from the first liquid outlet 170 to the liquid injection hole 210 of the battery.

[0051] exist Figure 1 and 3In the example shown, during positive pressure injection, the first valve 220 is opened, and the electrolyte is directly injected into the battery after being buffered by the first injection cup 110. During negative pressure extraction, the first valve 220 is closed to allow the electrolyte from the battery to enter the second injection cup 120 along the second connecting pipe 140 and finally overflow to the first injection cup 110.

[0052] In such a design, the channel in the first connecting pipeline, that is, the passage from the first liquid outlet to the liquid injection hole of the battery, can be unidirectional, thereby reducing the possibility of electrolyte flowing from the liquid injection hole of the battery to the first liquid outlet.

[0053] According to some embodiments of the present application, a second valve 230 is disposed on the second connecting pipeline 140 .

[0054] In some embodiments, the second valve 230 may include a stop valve, a plunger valve, etc., which is not limited in the present disclosure.

[0055] By providing the second valve, it is possible to control whether the channel in the second connecting pipeline, that is, the passage from the first connecting pipeline to the third liquid inlet is open.

[0056] According to some embodiments of the present application, the second valve 230 includes a one-way valve to achieve one-way conduction from the first connecting pipeline 130 to the third liquid inlet 190 .

[0057] exist Figure 1 and 3 In the example shown, the second valve 230 is closed during positive pressure injection, and the second valve 230 is opened during negative pressure extraction to allow the electrolyte from the battery to flow into the second injection cup 120 along the second connecting pipe 140 and eventually overflow into the first injection cup 110 .

[0058] In such a design, the channel in the second connecting pipeline, that is, the passage from the first connecting pipeline to the third liquid inlet, can be unidirectional, thereby reducing the possibility of electrolyte flowing from the third liquid inlet to the first connecting pipeline.

[0059] Continue to refer to Figure 3 In some embodiments, a filter 240 is disposed inside the second liquid injection cup 120 to filter the refluxed electrolyte.

[0060] exist Figure 3 In the example shown, the filter element 240 may include a filter mesh, which may filter impurities in the electrolyte to reduce the electrolyte containing impurities from flowing back to the first liquid filling cup 110 .

[0061] In such a design, impurities in the electrolyte flowing through the second liquid filling cup when negative pressure is drawn can be filtered.

[0062] Continue to refer to Figure 3, the filter element 240 can be arranged close to the second liquid outlet 200 .

[0063] Herein, the term “close” may mean that the distance between two objects is within the range of 0.5 cm to 10 cm.

[0064] In such a design, the electrolyte flowing back to the second liquid filling cup can be filtered more fully.

[0065] Please refer to further Figure 3 According to some embodiments of the present application, the second liquid inlet 180 is disposed at a position above half the height of the first liquid injection cup 110 , and / or the second liquid outlet 200 is disposed at a position above half the height of the second liquid injection cup 120 .

[0066] exist Figure 3 In the example shown, the second liquid inlet 180 is disposed at almost two-thirds of the height of the first liquid filling cup 110 , and the second liquid outlet 200 is disposed at almost two-thirds of the height of the second liquid filling cup 120 .

[0067] By arranging the connecting portion of the two cavities to be higher than half the height of the liquid filling cup, the excess electrolyte can overflow into the first liquid filling cup only when the liquid level of the electrolyte in the second liquid filling cup is higher.

[0068] Continue to refer to Figure 1 The battery liquid injection device 100 may further include a fourth connecting pipeline 250 for connecting the first liquid inlet 160 with the electrolyte storage tank 260 .

[0069] According to some embodiments of the present application, the fourth connecting pipeline may be connected to a positive pressure device and a negative pressure device to perform positive pressure injection and negative pressure extraction respectively.

[0070] By providing the fourth connecting pipeline, the first liquid inlet of the first liquid filling cup can be connected to the electrolyte storage tank to introduce the electrolyte in the storage tank into the first liquid filling cup.

[0071] According to some embodiments of the present application, the second liquid filling cup 120 further includes a third liquid outlet 270 for discharging the waste electrolyte out of the second liquid filling cup 120 .

[0072] exist Figure 3 In the example shown, the third liquid outlet 270 is disposed at the bottom of the second liquid filling cup 120 and below the filter element 240 .

[0073] By arranging the third liquid outlet on the second liquid filling cup, the waste electrolyte can be discharged from the second liquid filling cup regularly.

[0074] Continue to refer to Figure 3The battery liquid injection device 100 further includes a fifth connecting pipeline 280 for connecting the third liquid outlet 270 with the electrolyte collection device.

[0075] According to some embodiments of the present application, the electrolyte collection device can recycle the electrolyte for further post-processing. According to some embodiments of the present application, the fifth connecting pipeline 280 can also be provided with a valve.

[0076] The specific structure and function of the sealing structure 100 used for sealing between the battery pack case 110 and the electrical device frame 130 have been described in detail above.

[0077] In such a design, the waste electrolyte can be further discharged from the second liquid injection cup to the electrolyte collection device for further processing.

[0078] According to some embodiments of the present application, see Figure 1 The present application provides a battery filling device 100, which includes a first filling cup 110, a second filling cup 120, a first connecting pipeline 130, a second connecting pipeline 140 and a third connecting pipeline 150. The first filling cup 110 includes: a first liquid inlet 160, a first liquid outlet 170 and a second liquid inlet 180. The first liquid inlet 160 is used for electrolyte to flow into the first filling cup 110. The first liquid outlet 170 is used for electrolyte to flow out of the first filling cup 110. The second liquid inlet 180 is used for supplying refluxed electrolyte into the first filling cup 110. The second filling cup 120 is used to be in fluid communication with the first filling cup 110. The second filling cup 120 includes a third liquid inlet 190 and a second liquid outlet 200. The third liquid inlet 190 is used for supplying refluxed electrolyte into the second filling cup 120. The second liquid outlet 200 is used for the refluxed electrolyte to flow out of the second liquid filling cup 120. The first connecting line 130 is used to connect the first liquid outlet 170 and the liquid filling hole 210 of the battery 290. The second connecting line 140 is used to connect the first connecting line 130 and the third liquid inlet 190. The third connecting line 150 is used to connect the second liquid outlet 200 and the second liquid inlet 180. In addition, a first valve 220 is provided on the first connecting line 130. The first valve 220 is located upstream of the connection between the second connecting line 140 and the first connecting line 130 along the flow direction of the electrolyte flowing out of the first liquid outlet 170. The first valve 220 includes a one-way valve to achieve one-way conduction from the first liquid outlet 170 to the liquid filling hole 210 of the battery. In addition, a second valve 230 is provided on the second connecting line 140. The second valve 230 includes a one-way valve to achieve one-way conduction from the first connecting pipeline 130 to the third liquid inlet 190 .

[0079] Reference Figure 4 , Figure 4Schematic diagram of the structure of a battery filling device 400 according to some embodiments of the present application. The battery filling device 400 includes an electrolyte storage tank 260 and at least one battery filling device 100. The battery filling device 100 is used to fill the battery 290 with electrolyte via the filling hole 210 of the battery 290.

[0080] According to some embodiments of the present application, multiple battery filling devices 100 may be used to simultaneously fill multiple batteries 290 .

[0081] exist Figure 4 In the example shown, the first connecting pipe 130 of the battery filling device 100 is connected to the filling hole 210 of the battery 290. After the first connecting pipe 130 of the battery filling device 100 is connected to the filling hole 210 of the battery 290, the negative pressure device and the positive pressure device can cause negative pressure and positive pressure to alternately appear in the first filling cup 110, and the negative pressure device can extract the electrolyte in the battery 290.

[0082] The specific structure and function of the battery filling device 100 for filling the battery 290 via the filling hole 210 of the battery 290 have been described in detail above.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application 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 replace some or all of the technical features therein by equivalents; 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 application, and they should all be included in the scope of the claims and specification of the present application. 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. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery liquid injection device (100), characterized in that: include: The first liquid injection cup (110) comprises: A first liquid inlet (160) for allowing electrolyte to flow into the first liquid injection cup (110); a first liquid outlet (170) for allowing the electrolyte to flow out of the first liquid injection cup (110); and a second liquid inlet (180) for allowing the refluxed electrolyte to flow into the first liquid injection cup (110); A second liquid injection cup (120) is used for fluid communication with the first liquid injection cup (110), and the second liquid injection cup (120) comprises: a third liquid inlet (190) for allowing the refluxed electrolyte to flow into the second liquid injection cup (120); and A second liquid outlet (200) for allowing the refluxed electrolyte to flow out of the second liquid injection cup (120); A first connecting pipeline (130) used to connect the first liquid outlet (170) and the liquid injection hole (210) of the battery (290); a second connecting pipeline (140), used for connecting the first connecting pipeline (130) and the third liquid inlet (190); and The third connecting pipeline (150) is used to connect the second liquid outlet (200) and the second liquid inlet (180).

2. The battery liquid filling device (100) according to claim 1, characterized in that: A first valve (220) is provided on the first connecting pipeline (130), and the first valve (220) is located upstream of the connection between the second connecting pipeline (140) and the first connecting pipeline (130) along the flow direction of the electrolyte flowing out of the first liquid outlet (170).

3. The battery liquid filling device (100) according to claim 2, characterized in that: The first valve (220) comprises a one-way valve to achieve one-way conduction from the first liquid outlet (170) to the liquid injection hole (210) of the battery.

4. The battery liquid filling device (100) according to any one of claims 1 to 3, characterized in that: The second connecting pipeline (140) is provided with a second valve (230).

5. The battery liquid filling device (100) according to claim 4, characterized in that: The second valve (230) comprises a one-way valve to achieve one-way conduction from the first connecting pipeline (130) to the third liquid inlet (190).

6. The battery liquid filling device (100) according to any one of claims 1 to 3, characterized in that: A filter (240) is disposed inside the second liquid injection cup (120) to filter the refluxed electrolyte.

7. The battery liquid filling device (100) according to claim 6, characterized in that: The filter element (240) is arranged close to the second liquid outlet (200).

8. The battery liquid filling device (100) according to any one of claims 1 to 3, characterized in that: The second liquid inlet (180) is arranged at a position above half the height of the first liquid injection cup (110), and / or the second liquid outlet (200) is arranged at a position above half the height of the second liquid injection cup (120).

9. The battery liquid filling device (100) according to any one of claims 1 to 3, characterized in that: Also includes: A fourth connecting pipeline (250) is used to connect the first liquid inlet (160) and the electrolyte storage tank (260).

10. The battery liquid filling device (100) according to any one of claims 1 to 3, characterized in that: The second liquid injection cup (120) further comprises: The third liquid outlet (270) is used to discharge the discarded electrolyte out of the second liquid injection cup (120).

11. The battery liquid filling device (100) according to claim 10, characterized in that: Also includes: A fifth connecting pipeline (280) is used to connect the third liquid outlet (270) and the electrolyte collection device.

12. A battery filling device (400), characterized in that: A battery liquid injection device (100) comprising a storage tank (260) for electrolyte and at least one battery liquid injection device (100) according to any one of claims 1 to 11, wherein the battery liquid injection device (100) is used to inject liquid into the battery (290) via an injection hole (210) of the battery (290).

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