CN116613486A

CN116613486A - Liquid injection safety device, liquid injection method and liquid injection system of battery

Info

Publication number: CN116613486A
Application number: CN202310873370.5A
Authority: CN
Inventors: 吴凯; 孙陈铭; 冯亚兰
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-07-17
Filing date: 2023-07-17
Publication date: 2023-08-18
Anticipated expiration: 2043-07-17
Also published as: CN116613486B

Abstract

The embodiment of the application provides a liquid injection safety device, a liquid injection method and a liquid injection system of a battery. A liquid injection safety device for a battery is applied to a battery (100) having a liquid injection port (1312), the liquid injection safety device comprising: and a liquid injection member channel (210) provided corresponding to the liquid injection port (1312) of the battery (100), the liquid injection member channel (210) being configured to pass through the liquid injection member (300) so that the liquid injection member (300) injects the electrolyte into the battery (100) through the liquid injection port (1312) of the battery (100). Through this technical scheme, utilize annotating liquid safety device at annotating liquid in-process and protect the battery, annotate the liquid piece and pass the notes liquid mouth of battery through annotating liquid piece passageway that sets up in the notes liquid safety device that the liquid piece can be comparatively accurate, reduced annotate the possibility that liquid piece skew caused the influence to the battery to promote the manufacturing performance of battery at annotating liquid in-process and the reliability of use of battery.

Description

Liquid injection safety device, liquid injection method and liquid injection system of battery

Technical Field

The embodiment of the application relates to the field of batteries, and in particular relates to a liquid injection safety device, a liquid injection method and a liquid injection system of a battery.

Background

With the development of the age, the electric automobile has huge market prospect due to the advantages of high environmental protection, low noise, low use cost and the like, can effectively promote energy conservation and emission reduction, and is beneficial to the development and progress of society. For electric vehicles, battery technology is an important factor in the development thereof.

In the development of battery technology, attention is paid to the electric properties such as charge and discharge of a battery, and also to the manufacturing processability of a battery. For example, electrolyte is a composition of a battery, and the injection process of electrolyte into a battery case is also critical to the overall performance of the battery. In view of this, how to improve the manufacturing performance of the battery in the liquid injection process is a technical problem to be solved.

Disclosure of Invention

The embodiment of the application provides a liquid injection safety device, a liquid injection method and a liquid injection system of a battery, which can improve the manufacturing performance of the battery in the liquid injection process.

In a first aspect, a liquid injection safety device for a battery is provided, the liquid injection safety device being applied to a battery having a liquid injection port, the liquid injection safety device comprising: the liquid injection piece channel is arranged corresponding to the liquid injection port of the battery, and is used for injecting electrolyte into the battery through the liquid injection piece through the liquid injection port of the battery.

According to the technical scheme provided by the embodiment of the application, the electrolyte is injected into the battery by the liquid injection part, so that the problem of electrolyte pollution caused by electrolyte leakage in the liquid injection process can be reduced. Further, the battery is protected by the liquid injection safety device in the liquid injection process, the liquid injection part can pass through the liquid injection port of the battery accurately through the liquid injection part channel arranged in the liquid injection safety device, the possibility that the liquid injection part is deviated to influence the battery is reduced, and therefore the manufacturing performance of the battery in the liquid injection process and the use reliability of the battery are improved.

In some possible embodiments, the liquid injection safety device comprises a liquid injection safety cap configured to be snapped onto the battery.

Through the technical scheme of this embodiment, with annotating liquid safety device design for annotating liquid safety helmet, be favorable to this annotate liquid safety helmet comparatively convenient and reliable fixed setting in the battery, annotate the positional relationship between liquid safety helmet and the battery relatively fixed to make annotate the inside that liquid spare can be comparatively accurate get into the battery through annotating liquid safety helmet, be favorable to further promoting the manufacturing performance of battery at annotating the liquid in-process.

In some possible embodiments, a first inclined surface guide groove is formed at an end of the injection member channel away from the battery, an inclined surface of the first inclined surface guide groove is inclined with respect to an axial direction of the injection member channel, and the first inclined surface guide groove is used for guiding the injection member into the injection member channel.

Through the technical scheme of the embodiment, the diameter of the liquid injection part channel at the inlet end (namely, the end of the liquid injection part channel far away from the battery) can be enlarged, so that the liquid injection part can conveniently and smoothly enter the liquid injection part channel, the probability of blocking of the liquid injection part at the inlet end of the liquid injection part channel is reduced, and the manufacturing performance of the battery in the liquid injection process is further improved.

In some possible embodiments, the first beveled guide groove comprises a beveled guide groove.

Through the technical scheme of this embodiment, design the first inclined plane guide way into the conical surface guide way, can make this first inclined plane guide way have smooth surface to be convenient for play good guide effect to annotate the liquid spare, further reduce annotate the liquid spare and take place the probability of card to stop in annotating liquid spare passageway department, promote the manufacturing performance of battery at annotating the liquid in-process.

In some possible embodiments, a second inclined plane guiding groove is arranged at one end of the injection safety cap buckled on the battery, the inclined plane of the second inclined plane guiding groove is inclined relative to the wall of the battery, and the second inclined plane guiding groove is used for guiding the injection safety cap to be buckled on the battery.

Through the technical scheme of the embodiment, the second inclined plane guide groove can enlarge the inner diameter of the liquid injection safety helmet, so that the battery is allowed to have larger displacement allowance, and even if the battery has certain position offset compared with the liquid injection safety helmet, the liquid injection safety helmet can be smoothly buckled on the battery through the second inclined plane guide groove, and the production efficiency of the battery in the liquid injection process is further improved.

In some possible embodiments, the second beveled guide groove comprises a beveled guide groove.

Through the technical scheme of this embodiment, design the second inclined plane guide way into the conical surface guide way, can make this second inclined plane guide way have smooth surface to be convenient for play good guide effect to the battery, make the battery can be reliable and stable with annotate the mutual lock of liquid safety helmet, further promote the manufacturing performance of battery at annotating the liquid in-process.

In some possible embodiments, the liquid injection safety device corresponds to a wall of the electrode terminal of the battery, and a receiving groove for receiving the electrode terminal is formed in the liquid injection safety device.

Through the technical scheme of the embodiment, the holding groove in the liquid injection safety device can play a good protection role on the electrode terminal, and the liquid injection safety device and the battery can be accurately aligned, so that the correspondence between the liquid injection part channel in the liquid injection safety device and the liquid injection port in the battery is improved, and the manufacturing performance of the battery in the liquid injection process is further improved.

In some possible embodiments, the shape of the receiving groove matches the shape of the electrode terminal.

Through the technical scheme of this embodiment, under the condition that first holding tank and electrode terminal mutually match, the counterpoint precision between the two is higher, and can realize close fit, promotes the connection stability between annotating liquid safety device and the battery. Meanwhile, the gap between the first accommodating groove and the electrode terminal is smaller, and the first accommodating groove can play a good role in protecting the electrode terminal, so that interference and influence of the external environment on the electrode terminal in the liquid injection process are reduced.

In some possible embodiments, the liquid injection safety device is provided with an air guide groove which is communicated with a first surface attached to the battery in the liquid injection safety device and a surface facing the external environment in the liquid injection safety device.

Through the technical scheme of this embodiment, the air duct can be with the atmospheric gas in the external environment leading-in to annotate in the clearance between liquid safety device's the first surface and the battery, improves annotate the pressure between liquid safety device and the battery, and this annotate liquid safety device and break away from in the battery of being convenient for, and then promotes the production efficiency of battery.

In some possible embodiments, the air guide groove is communicated with the first surface and a second surface opposite to the first surface in the liquid injection safety device.

Through the technical scheme of the embodiment, the air guide groove is designed to be communicated with the first surface and the second surface which are opposite, so that the air guide groove can be conveniently manufactured in the liquid injection safety device, and the overall manufacturing cost of the liquid injection safety device is reduced.

In some possible embodiments, the liquid filling port of the battery is provided with a seal, and the liquid filling channel is provided corresponding to the seal, and the liquid filling channel is used for filling electrolyte into the battery through the liquid filling channel, so that the liquid filling channel penetrates through the seal.

Through the technical scheme of the embodiment, the liquid injection port of the battery is provided with the sealing piece, and in the liquid injection process, the liquid injection piece is utilized to penetrate through the sealing piece to enter the battery for liquid injection, so that the problem of electrolyte pollution caused by electrolyte leakage in the liquid injection process can be reduced, and the manufacturing performance of the battery in the liquid injection process and the use reliability of the battery are improved.

In some possible embodiments, the length L1 of the sprue channel and the length L2 of the target segment in the sprue are such that: and L1 is more than or equal to 2 xL 2, wherein the target section is positioned at one end of the liquid injection piece facing the inside of the battery and is positioned outside the liquid injection piece channel.

Through the technical scheme of this embodiment, annotate liquid spare passageway can play better constraint effect to annotating liquid spare, reduces annotating holistic skew degree of liquid spare for annotate the liquid spare and can get into the notes liquid mouth of battery with the angle of preferred and cause interference and influence to the department structure of annotating the liquid mouth with the reduction annotating liquid spare. In addition, in the case that the liquid injection port of the battery is provided with a sealing member, the liquid injection member can pass through the sealing member at a preferable angle, so that the liquid injection member can effectively and rapidly pass through the sealing member to enter the interior of the battery.

In some possible embodiments, the diameter D1 of the insert and the diameter D2 of the insert channel satisfy: 0 < (D2-D1)/D1 is less than or equal to 0.15.

Through the technical scheme of this embodiment, also can reduce annotate holistic skew of liquid spare for annotate the liquid spare and can get into the notes liquid mouth of battery with the preferred angle and cause interference and influence to annotating the department structure piece of liquid mouth with the reduction notes liquid spare.

In some possible embodiments, the material of the priming safety device comprises a high molecular polymer.

According to the technical scheme, the injection safety device manufactured by the high-molecular polymer can have better wear resistance, higher strength and higher corrosion resistance, so that the injection safety device can be stably and reliably applied to the injection process of the battery, plays a role in safety protection of the battery, and simultaneously has less abrasion and influence on the battery.

In a second aspect, a method for injecting liquid into a battery is provided, including: a liquid injection safety device is arranged on the battery, and a liquid injection piece channel corresponding to a liquid injection port of the battery is formed in the liquid injection safety device; moving the liquid injection piece in the liquid injection piece channel so that the liquid injection piece enters the battery through the liquid injection piece channel and the liquid injection port; electrolyte is injected into the battery through the injection member.

In some possible embodiments, before the liquid injection safety device is disposed on the battery, the liquid injection method further includes: a sealing element is arranged at a liquid injection port of the battery; the above-mentioned remove notes liquid spare in annotating liquid spare passageway to make annotate liquid spare and get into the inside of battery through annotating liquid spare passageway and notes liquid mouth, include: the filler piece is moved within the filler piece channel such that the filler piece enters the interior of the battery through the filler piece channel and the seal.

In a third aspect, there is provided a liquid injection system for a battery, comprising: a liquid injection member and the liquid injection safety device of the first aspect or any possible implementation manner of the first aspect, the liquid injection safety device being configured to be disposed on a battery, the liquid injection member being configured to inject electrolyte into the battery through the liquid injection safety device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a battery according to an embodiment of the present application;

FIG. 2 is a schematic perspective view of a battery injection safety device and a battery in cooperation with each other according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of the liquid injection safety device and battery shown in FIG. 2 taken along the direction A-A';

FIG. 4 is another schematic perspective view of a battery injection safety device according to an embodiment of the present application in cooperation with a battery;

FIG. 5 is a schematic cross-sectional view of a priming safety device provided in an embodiment of the present application;

FIG. 6 is a schematic perspective view of the priming safety device shown in FIG. 5;

FIG. 7 is another schematic perspective view of a battery injection safety device according to an embodiment of the present application in cooperation with a battery;

FIG. 8 is another schematic cross-sectional view of a priming safety device provided in an embodiment of the present application;

FIG. 9 is a schematic flow chart diagram of a method for filling a battery according to an embodiment of the present application;

fig. 10 is a schematic block diagram of a battery liquid injection system according to an embodiment of the present application.

In the drawings, the drawings are not drawn to scale.

Reference numerals illustrate:

100-cell; 110-a housing; 120-electrode assembly, 121-tab; 130-end cap assembly, 1301-negative end cap, 1302-positive end cap, 1311-electrode terminal, 1312-liquid injection port; 140-seals;

200-filling safety device; 210-a liquid injection part channel, 220-a first inclined plane guide groove, 230-a second inclined plane guide groove, 240-a first accommodating groove, 250-a second accommodating groove and 260-an air guide groove;

300-liquid injection piece;

400-priming device;

500-seal mounting means;

1-a liquid injection system of a battery.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.

In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the present application and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.

The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: there are three cases, a, B, a and B simultaneously. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

Unless defined otherwise, 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 application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.

In the field of new energy, batteries are of self-evident importance as a main power source for electric devices, such as electric vehicles, ships, spacecraft, or the like. In the present application, the battery may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, to which the embodiment of the present application is not limited. In some related art, the battery may also be referred to as a battery cell (battery cell) or a battery cell. In particular implementations, one or more batteries may constitute a battery module or battery pack (battery pack) to provide higher voltage and capacity to the powered device. Alternatively, the battery pack may include a case for enclosing one or more batteries. The case can reduce the influence of liquid or other foreign matter on the charge or discharge of the battery.

In the present application, the battery may have a cylindrical shape, a flat shape, a rectangular shape, or other shapes, etc., which are not limited in the embodiment of the present application. In addition, batteries are generally divided into three types in a packaged manner: cylindrical batteries, square batteries, and pouch batteries, which are not limited in this embodiment of the application.

Various design factors are considered in the development of battery technology, for example, in order to improve the charge and discharge performance of the battery, various performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate and the like of the battery are considered. In addition, the manufacturing efficiency and the manufacturing performance of the battery are also important for popularization, application and long-term development of the battery.

The battery generally includes a case, an electrode assembly, and an electrolyte, wherein the case is operable to accommodate the electrode assembly, which is composed of a positive electrode sheet, a negative electrode sheet, and a separator, and the electrolyte, as an electrolyte, can conduct ions between the positive electrode sheet and the negative electrode sheet of the electrode assembly, thereby achieving normal operation of the battery. For lithium batteries, the electrolyte may include lithium salts, organic solvents, and the like.

In the process of manufacturing a battery, a process of injecting an electrolyte into a housing of the battery is also an important process, and the manufacturing performance of the injection process affects the final product performance of the battery. In some related technologies, in the process of injecting the liquid into the battery, an injection tool (such as an injection nozzle) is used to be arranged at the edge of the liquid injection port of the battery, the liquid is injected into the liquid injection port of the battery through the injection tool, and under the condition that the injection tool is not in good contact with the edge of the liquid injection port, the risk of liquid leakage possibly exists in the process of injecting the liquid, so that the problem of electrolyte pollution is generated, and the manufacturing of the subsequent battery and the product performance of the battery are affected.

Therefore, in order to solve the above-mentioned electrolyte pollution problem, can adopt annotate liquid needle, annotate liquid pipe etc. annotate liquid spare and regard as annotate liquid instrument, penetrate annotate liquid mouth in order to get into the inside of battery with annotating liquid spare, annotate liquid device accessible annotate liquid spare and directly pour into the inside of battery into the electrolyte to reduce the possibility that electrolyte revealed to the outside of battery. However, in the solution of injecting liquid by using the liquid injecting member, if the liquid injecting member is directly used to pierce the battery, the liquid injecting member may be pierced into other parts of the battery except the liquid injecting port, for example, into the electrode terminal of the battery, which may have a certain influence on the manufacturing performance and subsequent use performance of the battery.

In view of this, an embodiment of the present application provides a liquid injection safety device for a battery, which is applied to a battery having a liquid injection port, and includes: the liquid injection piece channel is arranged corresponding to the liquid injection port of the battery and is used for injecting electrolyte into the battery through the liquid injection piece through the liquid injection port of the battery. According to the technical scheme provided by the embodiment of the application, the electrolyte is injected into the battery by the liquid injection part, so that the problem of electrolyte pollution caused by electrolyte leakage in the liquid injection process can be reduced. Further, the battery is protected by the liquid injection safety device in the liquid injection process, the liquid injection part can pass through the liquid injection port of the battery accurately through the liquid injection part channel arranged in the liquid injection safety device, the possibility that the liquid injection part is deviated to influence the battery is reduced, and therefore the manufacturing performance of the battery in the liquid injection process and the use reliability of the battery are improved.

The technical scheme described by the embodiment of the application is suitable for various devices using batteries, such as electric vehicles, battery cars, electric tools, ships, spacecrafts and the like, wherein the spacecrafts comprise planes, rockets, spacecrafts, spacecraft and the like. It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described devices, but may be applied to all devices using batteries.

Fig. 1 shows a schematic structure of a battery 100 according to an embodiment of the present application.

As shown in fig. 1, battery 100 includes a case 110, an electrode assembly 120, and an end cap assembly 130. The housing 110 and the end cap assembly 130 form an outer shell or battery compartment. The housing 110 may be formed of metal (e.g., aluminum). The case 110 is dependent on the shape of the one or more electrode assemblies 120 combined. For example, the housing 110 may be a hollow cylinder as shown in fig. 1.

The case 110 has an opening, the electrode assembly 120 is received in the case 110, and the cap assembly 130 is used to cover the opening to receive the electrode assembly 120 in the case 110. Housing and protection of the electrode assembly 120 and other components is achieved through the case 110 and the cap assembly 130. The housing 110 is filled with an electrolyte, i.e., an electrolytic solution.

In the battery 100 provided in the embodiment of the present application, the electrode assemblies 120 may be provided in a single or a plurality according to actual use requirements, for example, 1 electrode assembly 120 is provided in the battery 100 in the embodiment shown in fig. 1.

With continued reference to fig. 1, end cap assembly 130 includes a negative end cap 1301 and a positive end cap 1302, which cover the opening of housing 110 from both ends of housing 110, respectively, to cap electrode assembly 120 within housing 110. Negative electrode end cap 1301 has a negative electrode terminal and positive electrode end cap 1302 has a positive electrode terminal. The electrode assembly 120 is provided with a tab 121, wherein a positive electrode terminal is electrically connected with a positive electrode tab of the electrode assembly 120, and a negative electrode terminal is electrically connected with a negative electrode tab of the electrode assembly 120.

In addition to the electrode terminals, the negative electrode end cover 1301 or the positive electrode end cover 1302 is provided with a liquid filling port 1312, and for example, in the embodiment shown in fig. 1, the central portion of the negative electrode end cover 1301 may be provided with the liquid filling port 1312. During the injection process of the battery 100, an external injection tool may be provided at the injection port 1312 to inject the electrolyte into the battery 100.

It should be noted that, in the battery 100 provided in the embodiment of the present application, the end cap assembly 130 may be provided with other battery components, such as a pressure release mechanism, besides the electrode terminal and the liquid injection port, and the specific composition structure of the battery 100 is not limited in the embodiment of the present application.

In addition, the battery 100 shown in fig. 1 is illustrated as a cylindrical battery, and the battery provided by the present application may be a prismatic battery, or a battery of other shape, in which the constituent parts may be similar to the battery 100 shown in fig. 1 above, and the casing of the prismatic battery may be a hollow prismatic casing.

Fig. 2 is a schematic perspective view illustrating a battery injection safety device 200 and a battery 100 according to an embodiment of the present application. Fig. 3 shows a schematic cross-sectional view of the injection safety device 200 and the battery 100 shown in fig. 2 along the direction A-A'.

As shown in fig. 2 and 3, the liquid injection safety device 200 is applied to a battery 100 having a liquid injection port 1312, and the liquid injection safety device 200 includes: a filler channel 210, the filler channel 210 being disposed corresponding to the filler port 1312 of the battery 100, and the filler channel 210 being configured to pass through the filler 300 such that the filler 300 injects electrolyte into the battery 100 through the filler port 1312 of the battery 100.

Alternatively, in the embodiment of the present application, the liquid injection member 300 may be, for example, a liquid injection needle, a liquid injection tube, or the like. The syringe channel 210 may be a needle channel or a tube channel, etc. corresponding to the syringe 300.

Specifically, in the embodiment of the present application, a liquid injection safety device 200 may be configured for the battery 100, and a liquid injection passage 210 is formed in the liquid injection safety device 200. Before the battery 100 is filled, the filling safety device 200 may be disposed on a wall of the filling port 1312 in the battery 100, and the filling channel 210 in the filling safety device 200 may correspond to the filling port 1312. Then, the injection material 300 is passed through the injection material passage 210 (for example, an injection needle is inserted into the injection needle passage), and the injection material 300 can reach the injection port 1312 of the battery 100 through the injection material passage 210, and the injection material 300 can further enter the inside of the battery 100 through the injection port 1312 to inject the liquid into the inside of the battery 100.

In some examples, as shown in fig. 2 and 3, the liquid injection port 1312 of the battery 100 may be disposed on the top wall of the battery 100, and then the liquid injection safety device 200 may be disposed above the battery 100 correspondingly, for example, on the top wall of the battery 100. The syringe 300 may be disposed coaxially with the syringe channel 210 in the syringe safety device 200. The filler 300 is movable in a vertical direction, and vertically enters the filler port 1312 of the battery 100 after passing through the filler channel 210.

In the embodiment of the present application, the length of the injection channel 210 in the injection safety device 200 is smaller than the overall length of the injection 300, so that the injection 300 can pass through the injection channel 210 to enter the interior of the battery 100. In addition, the diameter of the injection channel 210 is also required to be matched with the diameter of the injection 300, for example, slightly larger than the diameter of the injection 300, so that the injection 300 can smoothly pass through the injection channel 210 without blocking, and the injection 300 has a better correspondence with the injection port 1312 of the battery 100.

According to the technical scheme provided by the embodiment of the application, the electrolyte is injected into the battery 100 by using the injection piece 300, so that the problem of electrolyte pollution caused by electrolyte leakage in the process of injection can be reduced. Further, the battery 100 is protected by the injection safety device 200 in the injection process, the injection piece 300 can more accurately pass through the injection port of the battery 100 through the injection piece channel 210 arranged in the injection safety device 200, the possibility that the offset of the injection piece 300 affects the battery 100 is reduced, and therefore the manufacturing performance of the battery 100 in the injection process and the use reliability of the battery 100 are improved.

Fig. 4 shows another schematic structural diagram of the injection safety device 200 and the battery 100 according to the embodiment of the present application.

As shown in fig. 4, in some possible embodiments, the injection safety device 200 may include an injection safety cap configured to be snapped onto the battery 100.

Specifically, in this embodiment, the injection safety cap may include a cover and an annular wall, where the cover is disposed corresponding to the wall of the injection port 1312 in the battery 100, the annular wall is connected to a side of the cover facing the battery 100, and the annular wall may be disposed around the battery 100 after the injection safety cap is fastened to the battery 100.

The liquid injection channel 210 is formed in the cover of the liquid injection safety helmet, and the liquid injection channel 210 penetrates through the cover of the liquid injection safety helmet. The axial direction of the filling channel 210 may be perpendicular to the wall of the filling port 1312 in the battery 100, so that the filling 300 can pass through the filling port 1312 vertically to enter the interior of the battery 100 accurately for filling.

In some embodiments, as shown in fig. 4, when the injection port 1312 is formed at the center of the wall where it is located, the injection member channel 210 may also be formed correspondingly at the center of the cover body of the injection safety cap.

Through the technical scheme of this embodiment, with annotating liquid safety device 200 design as annotating liquid safety helmet, be favorable to this annotate liquid safety helmet comparatively convenient and reliable fixed setting in battery 100, annotate the positional relationship between liquid safety helmet and the battery 100 relatively fixed to make annotate the inside that liquid spare 300 can be comparatively accurate get into battery 100 through annotating liquid safety helmet, be favorable to further promoting battery 100 at the manufacturing performance of annotating the liquid in-process.

Fig. 5 shows a schematic cross-sectional view of a priming safety device 200 provided in an embodiment of the present application.

As shown in fig. 5, in the injection safety device 200 provided by the embodiment of the application, a first inclined guiding groove 220 is formed at one end of the injection member channel 210 far away from the battery 100, the inclined surface of the first inclined guiding groove 220 is inclined with respect to the axial direction of the injection member channel 210, and the first inclined guiding groove 220 is used for guiding the injection member 300 to enter the injection member channel 210.

Specifically, in an embodiment of the present application, the end of the injector channel 210 away from the battery 100 may be the inlet end of the injector channel 210, i.e., the injector 300 enters from the inlet end of the injector channel 210. The first inclined guiding groove 220 is disposed at the inlet end of the injection channel 210, so as to enlarge the diameter of the injection channel 210 at the inlet end, which is beneficial for the injection 300 to enter the injection channel 210 more conveniently and smoothly. In the case that the injection member 300 is an injection needle, the probability that the injection member 300 is stuck at the inlet end of the injection member channel 210 can be effectively reduced, so that the manufacturing performance of the battery 100 in the injection process is further improved.

Alternatively, by way of example and not limitation, the first inclined guide groove 220 may include a tapered guide groove. The first inclined guiding groove 220 may have a truncated cone structure, and a side surface thereof is a conical surface. The upper bottom of the first inclined guiding groove 220 is a surface far from the battery 100, the lower bottom of the first inclined guiding groove 220 is a surface facing the battery 100, and the upper bottom area of the first inclined guiding groove 220 can be larger than the lower bottom area.

Through the technical scheme of the embodiment, the first inclined plane guide groove 220 is designed as a conical surface guide groove, so that the first inclined plane guide groove 220 has a smooth surface, thereby being convenient for playing a good role in guiding the liquid injection piece 300, further reducing the probability of the liquid injection piece 300 being blocked at the liquid injection piece channel 210, and improving the manufacturing performance of the battery 100 in the liquid injection process.

In some alternative embodiments, the first inclined guiding groove 220 may be designed as a truncated cone structure with a conical surface, but may also be designed as a truncated cone structure with other types of structures, and the embodiment of the present application is not limited thereto.

Fig. 6 shows a schematic perspective view of the priming safety device 200 shown in fig. 5.

Referring to fig. 5 and 6, in the case that the injection safety device 200 is an injection safety cap, a second inclined guide groove 230 may be disposed at one end of the injection safety cap that is fastened to the battery 100, and an inclined surface of the second inclined guide groove 230 is inclined with respect to a wall of the battery 100 (not shown in fig. 5 and 6), and the second inclined guide groove 230 is used for guiding the battery 100 to be fastened to the injection safety cap.

Specifically, in this embodiment, the end of the injection safety cap that is fastened to the battery 100 may be the end of the annular wall of the injection safety cap, and the inner circumferential surface of the annular wall may be provided with the second inclined guiding groove 230. The second inclined guiding groove 230 can enlarge the inner diameter of the injection safety helmet, thereby allowing the battery 100 to have larger displacement margin, even if the battery 100 does not correspond to the full position of the injection safety helmet, but has a certain position offset, the injection safety helmet can be smoothly buckled to the battery 100 through the second inclined guiding groove 230, so as to further improve the production efficiency of the battery 100 in the injection process.

Alternatively, by way of example and not limitation, the second inclined guide groove 230 may also include a tapered guide groove. The second inclined guiding groove 230 may have a truncated cone structure, and a side surface thereof is a conical surface. In addition, the upper bottom of the second inclined guiding groove 230 is a surface facing the pouring channel 210, the lower bottom of the second inclined guiding groove 230 is a surface far away from the pouring channel 210, and the upper bottom area of the second inclined guiding groove 230 can be smaller than the lower bottom area.

Through the technical scheme of this embodiment, design the second inclined plane guide way 230 as the conical surface guide way, can make this second inclined plane guide way 230 have smooth surface to be convenient for play good guide effect to battery 100, make battery 100 can be reliable and stable with annotate the mutual lock of liquid safety helmet, further promote the manufacturing performance of battery 100 in annotating the liquid in-process.

With continued reference to fig. 5 and 6, the injection safety device 200 may be provided to a wall (not shown in fig. 5 and 6) of the electrode terminal 1311 of the battery 100, and a first receiving groove 240 for receiving the electrode terminal 1311 is formed in the injection safety device 200.

Specifically, in this embodiment, the electrode terminal 1311 and the liquid injection port 1312 of the battery 100 may be located on the same wall of the battery 100, in which case the liquid injection safety device 200 may be provided in the battery 100 on the wall where the liquid injection port 1312 and the electrode terminal 1311 are located. The surface of the wall of the injection safety device 200 facing the injection port 1312 and the electrode terminal 1311 is formed with a first accommodating groove 240, so as to be convenient for accommodating the electrode terminal 1311 of the battery 100, so as to have a good protection effect on the electrode terminal 1311, and enable the injection safety device 200 to be accurately aligned with the battery 100, and promote the correspondence between the injection part channel 210 in the injection safety device 200 and the injection port 1312 in the battery 100, so as to further promote the manufacturing performance of the battery 100 in the injection process.

Alternatively, the shape of the first receiving groove 240 matches the shape of the electrode terminal 1311.

As an example, in the case where the electrode terminal 1311 is an annular protrusion electrode terminal, the first receiving groove 240 may be an annular receiving groove.

In the case where the first receiving groove 240 and the electrode terminal 1311 are matched with each other, alignment accuracy between the two is high, and tight fitting can be achieved, improving connection stability between the injection safety device 200 and the battery 100. Meanwhile, the gap between the first accommodating groove 240 and the electrode terminal 1311 is smaller, and the first accommodating groove 240 can well protect the electrode terminal 1311, so that interference and influence of the external environment on the electrode terminal 1311 in the liquid injection process are reduced.

With continued reference to fig. 5, in some embodiments, a gas-guide groove 260 is provided in the liquid-filled safety device 200, the gas-guide groove 260 communicating with a first surface of the liquid-filled safety device 200 that is attached to the battery 100 and a surface of the liquid-filled safety device 200 that faces the external environment.

Specifically, in the case where the liquid injection safety device 200 is correspondingly disposed on the battery 100, for example, in the case where the liquid injection safety device 200 is a liquid injection safety cap that is fastened to the battery 100, most of the area of the surface of the liquid injection safety device 200 facing the battery 100 may be attached to the wall of the battery 100, so that there is a high degree of fit and stable connection between the liquid injection safety device 200 and the battery 100.

In the case where the first surface of the liquid injection safety device 200 is attached to the battery 100, a gap between the first surface and the battery 100 is small, so that a small pressure or even a negative pressure is easily formed between the first surface and the battery 100, and in the process of separating the liquid injection safety device 200 from the battery 100 after the liquid injection is completed, the small pressure or even the negative pressure between the first surface and the battery 100 can make the liquid injection safety device 200 not easily separate from the battery 100, thereby affecting the production efficiency of the battery 100.

In view of this, in the embodiment of the present application, the gas guide groove 260 is disposed in the injection safety device 200, the gas guide groove 260 is connected to the first surface of the injection safety device 200 attached to the battery 100 and the surface of the injection safety device 200 facing the external environment, and the gas guide groove 260 can guide the atmospheric gas in the external environment into the gap between the first surface of the injection safety device 200 and the battery 100, so as to increase the pressure between the injection safety device 200 and the battery 100, and facilitate the separation of the injection safety device 200 from the battery 100, thereby improving the production efficiency of the battery 100.

In some possible embodiments, the air guide groove 260 communicates with a first surface of the injection safety device 200 attached to the battery 100 and a second surface of the injection safety device 200 opposite to the first surface.

Specifically, in this embodiment, the second surface opposite to the first surface is a surface of the liquid injection safety device 200 facing away from the battery 100, and the second surface is one of surfaces of the liquid injection safety device 200 facing toward the external environment.

In this embodiment, the air guide groove 260 may be a linear air guide channel extending through the injection safety device 200. The radial dimension of the air guide channel may be designed to be smaller, for example, the radial dimension of the air guide channel may be smaller than the radial dimension of the injector channel 210. With the smaller radial dimension of the air guide channel, the possibility that an interfering object in the external environment contacts the battery 100 through the air guide channel can be reduced, thereby reducing the interference and influence of the external environment on the battery 100.

By the technical scheme of the embodiment, the air guide groove 260 is designed to be communicated with the first surface and the second surface which are opposite, so that the air guide groove 260 can be conveniently manufactured in the liquid injection safety device 200, and the overall manufacturing cost of the liquid injection safety device 200 is reduced.

In some alternative embodiments, the air guide groove 260 may be designed as a curved or bent linear air guide channel, and the embodiment of the present application does not limit the shape design of the air guide groove 260.

The air guide groove 260 may be communicated with the first surface of the injection safety device 200 and the surface facing the external environment, and may also be communicated with the first surface and the injection material passage 210. Specifically, after the injector 300 is pulled away from the injector channel 210, the injector channel 210 may also be in communication with the atmosphere, and the air guide 260 may also guide the atmospheric gas to the first surface when the air guide 260 is in communication with the first surface and the injector channel 210.

In some possible embodiments, as shown in fig. 5, the number of the air guide grooves 260 may be plural, and the plurality of air guide grooves 260 may be disposed on two sides of the injection channel 210, so as to further reduce the possibility of forming a lower pressure or even a negative pressure between the injection safety device 200 and the battery 100.

Fig. 7 shows another schematic structural diagram of the injection safety device 200 and the battery 100 according to the embodiment of the present application. Alternatively, the priming safety device 200 in the embodiment shown in FIG. 7 may be the same structure as the priming safety device 200 in the embodiment shown in FIGS. 5 and 6 above.

As shown in fig. 7, in the embodiment of the present application, the injection port 1312 of the battery 100 is provided with a sealing member 140, and the injection passage 210 is provided corresponding to the sealing member 140, and the injection passage 210 is used to pass through the injection member 300 so that the injection member 300 injects the electrolyte into the interior of the battery 100 through the sealing member 140.

Specifically, the sealing member 140 is a structural member with sealing effect, and its external shape and size can be adapted to the liquid injection port 1312 of the battery 100, so as to perform a good sealing effect on the liquid injection port 1312 of the battery 100. In addition, the sealing member 140 may have a certain hardness, so as to improve the service performance of the sealing member 140 and reduce the influence of external stress on the sealing member 140.

Alternatively, in some embodiments, where the injection member 300 is an injection needle, the needle end of the injection needle may pierce the seal 140 under a certain pressure.

In addition, the seal 140 may be an elastic material, and the seal 140 may be elastically deformed after the syringe 300 is pulled away from the seal 140 to reduce the gap formed in the seal 140 by the syringe 300.

In this embodiment, after the injection molding 300 is pulled away from the sealing member 140, the elastic deformation of the sealing member 140 may make the gap in the sealing member 140 very small or even negligible, and the very small gap does not substantially affect the sealability of the battery 100, so that the sealing member 140 may be reused as a sealing member of the battery 100 during normal use to seal the injection port 1312 of the battery 100 in addition to improving the manufacturing performance of the battery 100 during injection. By the technical scheme of the embodiment, the manufacturing performance and the service performance of the battery 100 in the liquid injection process are improved comprehensively.

By way of example and not limitation, the material of the seal 140 may include rubber. The rubber material has better sealing property, certain hardness and better elastic deformation performance.

In some implementations, the seal 140 can be a glue spike. The seal 140 may be approximately nail-shaped in shape with a nut and a shank. The glue nail can be easily and stably installed at the liquid injection port 1312 of the battery 100 to have a good sealing effect on the battery 100.

In the technical solution of the embodiment of the present application, the liquid injection port 1312 of the battery 100 is provided with the sealing member 140, and in the liquid injection process, the liquid injection member 300 is utilized to penetrate through the sealing member 140 to enter the interior of the battery 100 for liquid injection, so that the problem of electrolyte pollution caused by leakage of electrolyte in the liquid injection process can be further reduced, and the manufacturing performance of the battery 100 in the liquid injection process and the use reliability of the battery 100 are improved.

In order to fit the sealing member 140, as shown in fig. 5 and 7, the injection safety device 200 may be provided with a second receiving groove 250, and the second receiving groove 250 is used to receive the sealing member 140.

Specifically, the second receiving groove 250 may be disposed at an end of the filler channel 210 facing the battery 100, that is, the second receiving groove 250 is disposed at an outlet end of the filler channel 210, thereby receiving the sealing member 140 corresponding to the filler channel 210. The shape of the second accommodating groove 250 can be matched with the sealing element 140 to design, so that the sealing element 140 can be well protected, and interference and influence of the external environment on the sealing element 140 in the liquid injection process are reduced.

Fig. 8 shows another schematic cross-sectional view of a priming safety device 200 provided by an embodiment of the present application.

Alternatively, as shown in fig. 8, the length L1 of the sprue channel 210 and the length L2 of the target segment in the sprue 300 may satisfy: L1.gtoreq.2XL2, wherein the target segment is located at an end of the filler piece 300 facing the interior of the battery 100 and is located outside the filler piece channel 210. By way of example, where the insert 300 is a needle, the target segment is located at the needle end of the needle and outside of the insert channel 210.

Alternatively, in the case where the inlet end of the syringe channel 210 is provided with the first inclined guide groove 220, the length L1 of the syringe channel 210 may include the depth of the first inclined guide groove 220.

Specifically, in this embodiment, the length of the injector 300 in the injector channel 210 is the length L1 of the injector channel 210, and a portion of the injector 300 in the injector channel 210 may be constrained by the injector channel 210 to control the distortion of the injector 300.

In the case where the syringe 300 is a syringe needle, the needle of the syringe 300 may pass through the syringe channel 210 to enter the interior of the battery 100, and thus a partial section (i.e., a target section) in the needle end of the syringe 300 may be located outside the syringe channel 210, with at least a portion of the target section being located in the interior of the battery 100. In the case where the liquid filling port 1312 of the battery 100 is provided with the sealing member 140, at least part of the target segment is located in the sealing member 140.

When the length L1 of the injection member channel 210 is greater, and the length L2 of the injection member 300 at a target segment other than the injection member channel 210 is smaller, for example, when the length L1 is greater than or equal to 2×l2, the injection member channel 210 can perform a better constraint function on the injection member 300, so that the overall distortion of the injection member 300 is reduced, and the injection member 300 can enter the injection port 1312 of the battery 100 at a better angle to reduce interference and influence of the injection member 300 on structural members at the injection port 1312. In addition, in the case where the filling port 1312 of the battery 100 is provided with the sealing member 140, the filling member 300 can pass through the sealing member 140 at a preferable angle, so that the filling member 300 can pass through the sealing member 140 effectively and rapidly to enter the inside of the battery 100.

Alternatively, with continued reference to FIG. 8, the diameter D1 of the insert 300 and the diameter D2 of the insert channel 210 satisfy: 0 < (D2-D1)/D1 is less than or equal to 0.15.

Specifically, in this embodiment, the diameter D2 of the syringe channel 210 will be greater than the diameter D1 of the syringe 300, i.e., D2-D1 > 0, to enable the syringe 300 to pass smoothly through the syringe channel 210.

Further, the difference (D2-D1) between the diameter D2 of the injector channel 210 and the diameter D1 of the injector 300 is also (D2-D1)/D1 is less than or equal to 0.15, in which case, the difference between the diameter D2 of the injector channel 210 and the diameter D1 of the injector 300 may be smaller, so that the injector channel 210 has a good constraining effect on the injector 300, and the injector 300 with a larger distortion cannot enter the battery 100 through the injector channel 210. Through the technical scheme of the embodiment, the overall distortion of the liquid injection part 300 can be reduced, so that the liquid injection part 300 can enter the liquid injection port 1312 of the battery 100 at a better angle to reduce the interference and influence of the liquid injection part 300 on the structural parts at the liquid injection port 1312.

In some possible embodiments, the material of the injection safety device 200 may include a high molecular polymer. By way of example, the high molecular polymer includes, but is not limited to, polyetheretherketone (PEEK) and the like.

Specifically, in order to make the battery 100 have better use stability and reliability, the housing of the battery 100 is generally made of a metal material, and in order to reduce abrasion and influence on the battery 100 when the injection safety device 200 contacts with the battery 100, the material of the injection safety device 200 may be a non-metal polymer. The high-molecular polymer can have better wear resistance, higher strength and higher corrosion resistance, so that the high-molecular polymer can be stably and reliably applied to the liquid injection process of the battery 100, plays a role in protecting the battery 100, and has smaller influence on the battery 100.

In the embodiment shown in fig. 8, the liquid injection safety device 200 may be a liquid injection safety cap in the embodiment shown in fig. 5 to 7. The relevant structural features of the priming safety device 200 may be found in the relevant description of any of the embodiments of fig. 5 to 7 above.

Optionally, in the injection safety cap, a first inclined guide groove 220 is formed at an end of the injection member channel 210 remote from the battery 100. In addition, a second inclined guiding groove 230 may be disposed at one end of the injection safety cap fastened to the battery 100. The first and second inclined guide grooves 220 and 230 may each be a tapered guide groove.

Optionally, the injection safety cap is fastened to the electrode terminal 1311 and the wall of the injection port 1312 in the battery 100, where the sealing member 140 is disposed at the injection port 1312. The injection cap has a first accommodation groove 240 for accommodating the electrode terminal 1311 and a second accommodation groove 250 for accommodating the sealing member 140. The shapes of the first receiving groove 240 and the second receiving groove 250 may be matched with the electrode terminal 1311 and the sealing member 140, so that the injection safety cap has a better fit with the battery 100. The first accommodating groove 240 and the second accommodating groove 250 can also realize accurate alignment of the injection safety cap and the battery 100, so that the injection part channel 210 in the injection safety cap can be aligned with the sealing part 140 of the battery 100 more accurately.

In addition, the gas guide groove 260 may be further provided in the injection safety cap, and the gas guide groove 260 is in communication with the first surface of the injection safety device 200 attached to the battery 100 and the surface of the injection safety device 200 facing the external environment. The air guide groove 260 can guide the air in the external environment into the gap between the first surface of the injection safety device 200 and the battery 100, so as to increase the pressure between the injection safety device 200 and the battery 100, facilitate the separation of the injection safety device 200 from the battery 100, and further improve the production efficiency of the battery 100. Alternatively, the number of the air guide grooves 260 may be plural, and the air guide grooves 260 may be disposed on two sides of the injector channel 210.

The above description is made with reference to fig. 2 to 8 to illustrate the injection safety device of the battery provided by the present application, and the following description is made with reference to fig. 9 to illustrate the injection method of the battery provided by the present application. It can be understood that the related technical solutions of the liquid injection method in the following embodiments may correspond to the related technical solutions of the liquid injection safety device in the foregoing embodiments, and details of the specific solutions may be referred to the related descriptions of the foregoing embodiments, which are not repeated herein.

Fig. 9 shows a schematic flow diagram of a method 10 for filling a battery according to an embodiment of the present application.

As shown in fig. 9, the method 10 of filling a battery may include the following steps.

S101: a liquid injection safety device is arranged on the battery, and a liquid injection piece channel corresponding to a liquid injection port of the battery is formed in the liquid injection safety device.

S102: the liquid filling piece is moved in the liquid filling piece channel so that the liquid filling piece enters the interior of the battery through the liquid filling piece channel and the liquid filling port.

S103: electrolyte is injected into the battery through the injection member.

Specifically, in the embodiment of the present application, the liquid injection method 10 may be applied to the battery 100 and the liquid injection safety device 200 in any of the above embodiments. The subject of the infusion method 10 may be an infusion system in a battery production line that may include multiple infusion devices to facilitate the execution of multiple steps in the infusion method 10.

In step S101, the battery production line may be provided with a mounting apparatus for mounting the liquid injection safety device 200, which may provide the liquid injection safety device 200 on the battery 100, and a liquid injection member passage 210 corresponding to the liquid injection port 1312 of the battery 100 is formed in the liquid injection safety device 200. Alternatively, the related design of the priming safety 200 and the priming channel 210 may be as described above with respect to any of the embodiments of fig. 2-8.

In step S102, the battery production line may be configured with a filler control device that may control the movement of the filler 300. In the case where the filler 300 is a filler needle, the filler control apparatus may pierce the filler needle into the filler channel 210 in the filler safety device 200 so that the filler needle can enter the interior of the battery 100 through the filler channel 210. Optionally, the related design of the injector channel 210 and the injector 300 may also be described in connection with any of the embodiments of fig. 2-8 above.

In step S103, the battery production line may be provided with a liquid injection device that can inject an electrolyte into the inside of the battery 100 through the liquid injection member 300. Alternatively, the electrolyte injection device may be understood as an electrolyte supply device connected to the electrolyte injection member 300, the electrolyte injection member 300 having an electrolyte injection passage formed therein, and the electrolyte in the electrolyte injection device flowing into the interior of the battery 100 through the electrolyte injection passage in the electrolyte injection member 300. Optionally, a switch may be disposed at the connection between the priming device and the priming member 300, where the priming device and the priming channel in the priming member 300 are in communication with each other when the switch is controlled to open, and where the priming device and the priming channel in the priming member 300 are turned off when the switch is controlled to close.

In some possible embodiments, before step S101 above, the priming method 10 may further include: in this case, the sealing member 140 is disposed at the liquid injection port 1312 of the battery 100, and the step S102 may include: the syringe 300 is moved within the syringe channel 210 such that the syringe 300 enters the interior of the battery 100 through the syringe channel 210 and the seal 140 at the syringe port 1312.

Alternatively, the relevant technical solution of the sealing member 140 can be seen from the above description of the embodiment shown in fig. 7. In the case where the sealing member 140 is provided at the liquid filling port 1312 of the battery 100, the battery 100 may have better liquid filling reliability.

In some embodiments, the internal gas of the battery 100 may be discharged through the electrolyte injection member 300 before the above step S103, i.e., before the electrolyte is injected into the interior of the battery 100 through the electrolyte injection member 300.

Through the technical scheme of the embodiment, the gas in the battery 100 can be discharged by the liquid injection member 300, and then the electrolyte is injected into the battery 100 through the liquid injection member 300, so that the discharged internal gas does not occupy the accommodating space in the battery 100, thereby being beneficial to improving the energy density and the product performance of the battery 100.

Alternatively, the internal gas of the battery 100 may be extracted through the injection member 300. Specifically, an air extractor is disposed in the battery production line, and is connected to the liquid injection member 300, and extracts the internal gas of the battery 100 through the liquid injection member 300. In some examples, after the air extractor extracts the internal gas of the battery 100, negative pressure can be formed in the battery 100, and the electrolyte in the normal pressure environment can be quickly injected into the battery 100 through the liquid injection member 300, which is not only beneficial to improving the liquid injection rate to improve the manufacturing and processing efficiency of the battery 100, but also can reduce the possibility of leakage or splashing of the electrolyte in the liquid injection process, thereby further improving the manufacturing performance of the battery 100 in the liquid injection process.

Alternatively, the internal gas of the battery 100 includes a gas generated in the process of performing the closed-end formation of the battery 100.

In the technical scheme provided by the embodiment, the reaction gas generated in the closed formation process of the battery 100 can be extracted through the liquid injection member 300, and then the electrolyte is injected into the battery 100 through the liquid injection member 300, so that on one hand, the capacity of the electrolyte injected into the battery 100 can be increased, the overall performance of the battery is improved, and on the other hand, the gas in the battery 100 can be reduced to reduce the internal gas pressure of the battery, and the possibility of explosion of the battery is reduced.

The embodiment of the application also provides a liquid injection system of the battery. As shown in fig. 10, the liquid injection system 1 of the battery may include a liquid injection member 300 and a liquid injection safety device 200.

Specifically, the injection safety device 200 may be configured to be disposed on the battery 100, and the injection member 300 is used to inject the electrolyte into the battery 100 through the injection safety device 200.

Alternatively, as shown in fig. 10, the electrolyte injection system 1 of the battery may further include an electrolyte injection device 400, the electrolyte injection device 400 being connected to the electrolyte injection member 300, the electrolyte injection device 400 being used to inject the electrolyte into the battery 100 through the electrolyte injection member 300.

Optionally, in the case where the sealing member 140 is provided at the liquid injection port 1312 of the battery 100, as shown in fig. 10, the liquid injection system 1 of the battery may further include: a seal mounting device 500, the seal mounting device 500 being configured to capture a seal 140 and to position the seal 140 at a fill port 1312 of the battery 100.

It will be appreciated that in the battery priming system 1, in addition to the respective priming devices shown in fig. 10, other auxiliary devices may be further included, such as a plurality of control devices for controlling the priming safety device 200, the priming member 300, and the priming device 400, and so forth.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A liquid injection safety device for a battery, characterized by being applied to a battery (100) having a liquid injection port (1312), the liquid injection safety device comprising:

a filler channel (210), the filler channel (210) being disposed corresponding to a filler port (1312) of the battery (100), the filler channel (210) being configured to pass through a filler (300) such that the filler (300) injects electrolyte into the interior of the battery (100) through the filler port (1312) of the battery (100);

the liquid injection safety device comprises a liquid injection safety cap, the liquid injection safety cap is configured to be buckled on the battery (100), the liquid injection safety cap comprises a cover body and an annular wall, the cover body is arranged corresponding to the wall of the liquid injection port (1312) in the battery (100), and the annular wall is connected to one side of the cover body, which faces the battery (100).

2. The injection safety device according to claim 1, wherein a first inclined surface guide groove (220) is formed at an end of the injection member channel (210) away from the battery (100), an inclined surface of the first inclined surface guide groove (220) is inclined with respect to an axial direction of the injection member channel (210), and the first inclined surface guide groove (220) is used for guiding the injection member (300) into the injection member channel (210).

3. The priming safety device of claim 2, wherein the first beveled guide slot (220) comprises a beveled guide slot.

4. A liquid injection safety device according to any one of claims 1 to 3, wherein a second inclined guide groove (230) is provided at one end of the liquid injection safety cap which is buckled with the battery (100), an inclined surface of the second inclined guide groove (230) is inclined relative to a wall of the battery (100), and the second inclined guide groove (230) is used for guiding the liquid injection safety cap to be buckled with the battery (100).

5. The priming safety device of claim 4, wherein the second sloped guide groove (230) comprises a tapered guide groove.

6. A liquid injection safety device according to any one of claims 1 to 3, wherein the liquid injection safety device is provided to a wall of an electrode terminal (1311) of the battery (100), and a receiving groove for receiving the electrode terminal (1311) is formed in the liquid injection safety device.

7. The liquid injection safety device according to claim 6, wherein the shape of the receiving groove matches the shape of the electrode terminal (1311).

8. A liquid injection safety device according to any one of claims 1-3, characterized in that an air guide groove (260) is provided in the liquid injection safety device, which air guide groove (260) communicates with a first surface of the liquid injection safety device attached to the battery (100) and a surface of the liquid injection safety device facing the external environment.

9. The liquid injection safety device according to claim 8, wherein the air guide groove (260) is communicated with the first surface and a second surface of the liquid injection safety device opposite to the first surface.

10. A liquid injection safety device according to any one of claims 1 to 3, wherein a liquid injection port (1312) of the battery (100) is provided with a seal (140), the liquid injection passage (210) is provided corresponding to the seal (140), and the liquid injection passage (210) is used for passing through the liquid injection member (300) so that the liquid injection member (300) injects electrolyte into the interior of the battery (100) through the seal (140).

11. A liquid injection safety device according to any one of claims 1 to 3, wherein the length L1 of the liquid injection member channel (210) and the length L2 of the target segment in the liquid injection member (300) satisfy: and L1 is larger than or equal to 2 xL 2, wherein the target section is positioned at one end of the liquid injection piece (300) facing the inside of the battery (100) and is positioned outside the liquid injection piece channel (210).

12. A liquid injection safety device according to any one of claims 1 to 3, wherein the diameter D1 of the liquid injection piece (300) and the diameter D2 of the liquid injection piece channel (210) satisfy: 0 < (D2-D1)/D1 is less than or equal to 0.15.

13. A liquid injection safety device according to any one of claims 1 to 3, wherein the material of the liquid injection safety device comprises a high molecular polymer.

14. A method of filling a battery, comprising:

a liquid injection safety device is arranged on the battery, and a liquid injection piece channel corresponding to a liquid injection port of the battery is formed in the liquid injection safety device;

moving a liquid filling member in the liquid filling member channel so that the liquid filling member enters the interior of the battery through the liquid filling member channel and the liquid filling port;

Electrolyte is injected into the battery through the liquid injection member.

15. A battery fluid injection system, comprising: the liquid injection part is provided with a plurality of liquid injection holes,

the liquid injection safety device of any one of claims 1 to 13, configured to be provided to the battery, the liquid injection member for injecting an electrolyte to the battery through the liquid injection safety device.