Overflow protection workpiece and liquid injection equipment

Abstract

The utility model relates to an overflow protection workpiece and liquid injection equipment, and relates to the technical field of battery production and processing equipment. The overflow protection workpiece is arranged between a first liquid injection assembly and a second liquid injection assembly, the first liquid injection assembly comprises a liquid injection needle, the second liquid injection assembly comprises a plurality of liquid injection cups arranged in parallel, and a gap is formed between every two adjacent liquid injection cups. The overflow protection workpiece comprises a plate body, the plate body is attached to the same side of the liquid injection cups, and the plate body covers the gap. A communicating hole is correspondingly formed in the plate body, and the communicating hole is matched with a flow guide hole formed in the liquid injection cup. When the first liquid injection assembly communicates with the second liquid injection assembly, the liquid injection needle can be matched with the communicating hole to block and seal the flow guide hole. According to the overflow protection workpiece provided by the invention, the problem that the production yield is influenced by the corrosion of a battery cell caused by overflow during electrolyte injection in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production and processing equipment, in particular to an overflow protection workpiece and a liquid injection device. BACKGROUND

[0002] An important step in the production and processing of power batteries is the injection of electrolyte, which is directly injected into the battery cell by a liquid injection device.

[0003] In the prior art, when the power battery is injected with electrolyte, a liquid injection mechanism is generally used to achieve a streamlined and rapid injection. For example, in a rotary table type liquid injection mechanism, the electrolyte is first injected from a primary cup into a secondary cup, and then injected into the battery cell by negative pressure injection.

[0004] However, in the above process, the connection position of the primary cup and the secondary cup may cause electrolyte to splash or overflow due to sealing reasons, and the electrolyte that has overflowed may drop onto the battery cell position, which may cause the positive and negative poles of the battery cell to corrode, affecting the yield of the battery cell. Invention content

[0005] The purpose of the present application is to provide an overflow protection workpiece and a liquid injection device, which can solve the problem of electrolyte overflow during electrolyte injection in the prior art, which can cause battery cell corrosion and affect production yield.

[0006] In order to achieve the above purpose, according to the first aspect of the present application, the overflow protection workpiece provided by the embodiments of the present application is arranged between the first liquid injection assembly and the second liquid injection assembly, the first liquid injection assembly includes a liquid injection needle, the second liquid injection assembly includes a plurality of liquid injection cups arranged in parallel, and the adjacent two liquid injection cups have a gap. The overflow protection workpiece includes a plate body, the plate body is attached to the same side of the plurality of liquid injection cups, and the plate body covers the gap. The plate body is provided with a communication hole corresponding to the gap, and the communication hole is matched with the flow guide hole formed on the liquid injection cup. When the first liquid injection assembly and the second liquid injection assembly are communicated, the liquid injection needle can block and close the flow guide hole in cooperation with the communication hole.

[0007] Based on the above-mentioned embodiments of the present application, when the electrolyte is injected into the battery cell, the electrolyte is injected from the first liquid injection assembly into the second liquid injection assembly, and then injected into the battery cell through negative pressure injection and the like in the second liquid injection assembly. During this process, the plate body is arranged on one side of the plurality of liquid injection cups in the second liquid injection assembly, and can cover the gap area between the liquid injection cups, and when the injection needle is inserted into the flow guide hole and cooperates with the position of the communication hole to complete the closure, the upper surface of the plate body forms a complete plate-shaped structure, thereby closing the connection position of the first liquid injection assembly and the second liquid injection assembly, i.e. the connection position of the injection needle and the flow guide hole, and reducing the possibility of electrolyte spraying caused by the injection pressure at the position of the flow guide hole. Further, even if a small amount of electrolyte is still sprayed during the injection process due to the injection pressure, the sprayed electrolyte will fall back onto the plate body. Since the plate body can cover the gaps between the liquid injection cups, electrolyte flowing along the edges of the liquid injection cups to the battery cell position to cause corrosion of the battery cell pole and the like can be avoided, thereby avoiding the reduction of yield caused by electrolyte corrosion during the production of the battery cell.

[0008] In some embodiments, when the first liquid injection assembly and the second liquid injection assembly are in communication, the injection needle is at least partially inserted into the communication hole, and the shape of the outer periphery surface of the injection needle insertion portion is matched with the shape of the inner wall of the communication hole.

[0009] Based on the above-mentioned embodiments of the present application, when the injection needle is inserted into the communication hole, the shape of the outer periphery surface of the injection needle insertion portion is matched with the shape of the inner wall of the communication hole, which on the one hand enables the injection needle insertion portion to match the communication hole and close the communication hole, and on the other hand enables the injection needle insertion portion to be partially staggered with the plate body at the communication hole portion, thereby improving the sealing effect when the injection needle and the communication hole are matched and closed, and further reducing the possibility of electrolyte overflow at the position of the communication hole during electrolyte injection.

[0010] In some embodiments, the overflow protection workpiece further comprises a liquid leakage prevention fence, which is arranged on the outer periphery side of the communication hole.

[0011] Based on the above-mentioned embodiments of the present application, by arranging the liquid leakage prevention fence, the liquid leakage prevention fence cooperates with the plate body to form a containing groove structure, thereby playing a temporary storage role when the electrolyte overflows, avoiding the leakage of electrolyte flowing out from the edge of the plate body, and further improving the protection effect of the overflow protection workpiece on the electrolyte overflow, and reducing the probability of electrolyte overflow and corrosion of the battery cell pole and the like.

[0012] In some embodiments, the liquid leakage prevention fence is arranged along the edge of the plate body.

[0013] Based on the above-mentioned embodiments of the present application, by setting the leakage-proof liquid barrier at the edge of the plate body, the leakage-proof liquid barrier and the entire plate body form a large containing groove structure, which can simultaneously contain multiple communication hole positions on the plate body.

[0014] In some embodiments, the height of the leakage-proof liquid barrier protruding from the plate body is H, and 5mm≤H≤20mm.

[0015] Based on the above-mentioned embodiments of the present application, by limiting the height of the leakage-proof liquid barrier protruding from the plate body, the problem of too little electrolyte that can be contained when the height of the leakage-proof liquid barrier is too low is avoided. At the same time, the problem of the overall volume of the liquid overflow protection workpiece being too large when the height of the leakage-proof liquid barrier is too high, causing inconvenience in assembly and use, is avoided.

[0016] In some embodiments, the plate body is provided with a relief groove for avoiding at least one of a negative pressure liquid injection pipeline, a pipeline mounting bracket, or a cup assembly structure.

[0017] Based on the above-mentioned embodiments of the present application, the liquid injection structure such as the first liquid injection assembly and the second liquid injection assembly usually includes a hydraulic drive structure and a negative pressure liquid injection structure when in use. The above-mentioned structures need to be matched with corresponding pipeline structures when in use. By setting the relief groove, the above-mentioned pipeline structure can flow out of the relief position when the liquid overflow protection workpiece is assembled, so that the liquid overflow protection workpiece can better cooperate with the first liquid injection assembly and the second liquid injection assembly.

[0018] In some embodiments, the relief groove can be provided at the edge of the plate body.

[0019] Based on the above-mentioned embodiments of the present application, by setting the relief groove at the edge of the plate body, the corresponding negative pressure liquid injection pipeline, pipeline mounting bracket, or cup assembly structure only needs to be clamped with the relief groove position when the liquid overflow protection workpiece is assembled and fixed. At the same time, setting the relief groove at the edge of the plate body is also convenient for processing.

[0020] In some embodiments, the plate body is provided with a connecting hole for connecting the plate body and the second liquid injection assembly by bolts.

[0021] Based on the above-mentioned embodiments of the present application, by setting the connecting hole, the plate body and the second liquid injection assembly are fixed by bolt connection. This can avoid the problem of protection failure caused by movement of the plate body during liquid injection. The bolt connection method is not only simple and convenient during connection, but also convenient for disassembly and replacement later.

[0022] According to the second aspect of the present application, a liquid injection device is provided, which includes a first liquid injection assembly, a second liquid injection assembly, and the above-mentioned liquid overflow protection workpiece. The liquid overflow protection workpiece is arranged on the surface of the second liquid injection assembly facing the first liquid injection assembly.

[0023] Based on the above embodiments of the present application, when the liquid injection equipment is used, the electrolyte is first injected from the first liquid injection assembly into the second liquid injection assembly, and then injected into the battery cell in the second liquid injection assembly by negative pressure injection and the like. In this process, the liquid injection equipment provided by the present application includes the above-mentioned overflow protection workpiece. By arranging the overflow protection workpiece on the surface of the second liquid injection assembly, the injection position can be closed and protected when the first liquid injection assembly injects liquid into the second liquid injection assembly, so as to avoid the electrolyte from dropping onto the battery cell position after the electrolyte overflow, thereby preventing the corrosion of the battery cell pole and other structures and affecting the production and processing yield.

[0024] In some embodiments, the first liquid injection assembly includes a liquid injection needle, the end of the liquid injection needle can be inserted into the flow guide hole, the middle of the liquid injection needle is provided with a connecting block, and the size of the connecting block is larger than that of the liquid injection needle. The size of the communication hole is larger than that of the flow guide hole, and the outer periphery of the connecting block abuts against the inner wall of the communication hole when the end of the liquid injection needle is inserted into the flow guide hole.

[0025] Based on the above embodiments of the present application, when the liquid injection equipment is used, the electrolyte is first injected from the first liquid injection assembly into the second liquid injection assembly, and then injected into the battery cell in the second liquid injection assembly by negative pressure injection and the like. In this process, the liquid injection equipment provided by the present application includes the above-mentioned overflow protection workpiece. By arranging the overflow protection workpiece on the surface of the second liquid injection assembly, the injection position can be closed and protected when the first liquid injection assembly injects liquid into the second liquid injection assembly, so as to avoid the electrolyte from dropping onto the battery cell position after the electrolyte overflow, thereby preventing the corrosion of the battery cell pole and other structures and affecting the production and processing yield.

[0026] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the present application, but do not constitute a limitation on the present application. In the drawings:

[0028] Figure 1 is a structural schematic diagram of the overflow protection workpiece provided by the embodiments of the present application.

[0029] Figure 2 is a cross-sectional schematic diagram of the overflow protection workpiece provided by the embodiments of the present application.

[0030] Figure 3 is a cross-sectional schematic diagram of the liquid injection equipment provided by the embodiments of the present application.

[0031] Figure 4 is Figure 3 is an enlarged schematic diagram of part A in FIG. 8.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1, first liquid injection assembly; 11, liquid injection needle; 12, connecting block; 2, second liquid injection assembly; 21, liquid injection cup; 22, flow guide hole; 3, plate body; 31, communication hole; 4, liquid leakage prevention fence; 5, avoidance groove; 6, connecting hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0035] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0037] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the present application, it should be noted that, without making the opposite statement, the orientation or position relationship indicated by the terms "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the product of the application is used, only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] An important step in the production and processing of power batteries is the injection of electrolyte. The electrolyte is directly injected into the battery cell through the injection equipment.

[0041] In the prior art, when the power battery is injected with electrolyte, the injection mechanism is generally used to realize the flow line type rapid injection. Taking a rotary table type injection mechanism as an example, the electrolyte is first injected from a primary cup to a secondary cup, and then the electrolyte is injected into the battery cell through negative pressure injection and other methods. In this process, the connection position of the primary cup and the secondary cup may cause the electrolyte to splash or overflow due to sealing reasons. The electrolyte that overflows and drops to the position of the battery cell may cause the positive and negative poles of the battery cell to be corroded, affecting the yield of the battery cell.

[0042] In order to solve the above problems in the prior art, according to the first aspect of the present application, referring to Figures 1 to 4 The overflow protection workpiece provided by the embodiments of the present application is arranged between the first injection assembly 1 and the second injection assembly 2. The first injection assembly 1 includes an injection needle 11, the second injection assembly 2 includes a plurality of injection cups 21 arranged in parallel, and there is a gap between adjacent two injection cups 21. The overflow protection workpiece includes a plate body 3, the plate body 3 is attached to the same side of the plurality of injection cups 21, and the plate body 3 covers the gap. The plate body 3 is correspondingly provided with a communication hole 31, and the communication hole 31 is matched with the flow guide hole 22 formed on the injection cup 21. When the first injection assembly 1 and the second injection assembly 2 are communicated, the injection needle 11 can block and close the flow guide hole 22 in cooperation with the communication hole 31.

[0043] Specifically, the overflow protection workpiece in the present application needs to be directly contacted with the electrolyte during use, so a metal material or a composite material with strong corrosion resistance can be selected when it is specifically arranged. At the same time, the communication hole 31 can be directly formed by stamping or other methods when it is arranged. The size of the communication hole 31 can be set to be slightly larger than the size of the flow guide hole 22, so as to avoid affecting the injection of the first injection assembly 1 into the flow guide hole 22 of the second injection assembly 2.

[0044] Based on the above embodiments of the application, when injecting electrolyte into the battery cell, the electrolyte is injected from the first liquid injection assembly 1 into the second liquid injection assembly 2, and then injected into the battery cell through negative pressure injection or the like in the second liquid injection assembly 2. In this process, the plate body 3 is arranged on one side of the plurality of liquid injection cups 21 in the second liquid injection assembly 2, and can cover the gap area between the liquid injection cups 21, and when the injection needle 11 is inserted into the flow guide hole 22, it is matched with the position of the communication hole 31 to complete the closure. At this time, the upper surface of the plate body 3 forms a complete plate-shaped structure, so as to close the connection position of the first liquid injection assembly 1 and the second liquid injection assembly 2, that is, the connection position of the injection needle 11 and the flow guide hole 22, and reduce the possibility of electrolyte spraying caused by the position of the flow guide hole 22 due to injection pressure.

[0045] Further, even if a small amount of electrolyte is sprayed during the injection process due to injection pressure at this time, the sprayed electrolyte will fall back onto the plate body 3. Since the plate body 3 can cover the gaps between the liquid injection cups 21, it can reduce or even avoid the electrolyte flowing along the edges corresponding to the above-mentioned gaps of the liquid injection cups 21, thereby improving the situation that the electrolyte flows to the battery cell position to cause corrosion of the battery cell pole column structure, and avoiding the reduction of yield caused by electrolyte corrosion during the production process of the battery cell.

[0046] Specifically, in actual use, the thickness of the plate body 3 should be avoided to be too thick or too thin. When the thickness of the plate body 3 is too thick, it will affect the cooperation injection between the injection needle 11 and the liquid injection cup 21, and when the thickness of the plate body 3 is too thin, it may affect the strength of the plate body 3, causing the plate body 3 to be easily deformed or damaged during the fixing and using process, and thus possibly causing liquid leakage to affect the protection effect. Therefore, the thickness of the plate body 3 should be limited. For example, when the plate body 3 is made of stainless steel, the thickness of the plate body 3 can be set to between 0.5mm and 2mm, and specific thickness values such as 0.5mm, 0.8mm, 1mm, 1.5mm and 2mm can be selected. The application does not make specific limitations on this.

[0047] In addition, it should be noted that the first liquid injection assembly 1 and the second liquid injection assembly 2 in the application are two parts of the liquid injection equipment, respectively. The first liquid injection assembly 1 mainly realizes the storage and supply of electrolyte, and the second liquid injection assembly 2 mainly includes liquid injection cups 21 and the like for realizing the injection of electrolyte into the battery cell, which can be completed by negative pressure injection or the like. The specific structures of the first liquid injection assembly 1 and the second liquid injection assembly 2 can be set in any suitable way in specific use. Since the application does not involve improvement of the above-mentioned specific structures, no specific limitation is made on this.

[0048] Further, referring to Figure 3 and Figure 4As shown in the above embodiments, in some embodiments of the present application, when the first liquid injection assembly 1 communicates with the second liquid injection assembly 2, the injection needle 11 is at least partially inserted into the communication hole 31, and the shape of the outer periphery of the inserted part of the injection needle 11 can be matched with the shape of the inner wall of the communication hole 31.

[0049] Based on the above embodiments of the present application, when the injection needle 11 is inserted into the communication hole 31, the shape of the outer periphery of the inserted part of the injection needle 11 is matched with the shape of the inner wall of the communication hole 31, which on one hand enables the inserted part of the injection needle 11 to be matched with the communication hole 31 and to seal the communication hole 31, and on the other hand enables the inserted part of the injection needle 11 to be partially staggered with the plate body 3 at the part of the communication hole 31, thereby improving the sealing effect when the injection needle 11 cooperates with the communication hole 31 to seal, and further reducing the possibility of electrolyte overflow at the position of the communication hole 31 during electrolyte injection.

[0050] Reference Figure 1 and Figure 2 As shown in the above embodiments, in some embodiments of the present application, the overflow protection workpiece can further include a liquid leakage prevention fence 4, which is arranged at the outer periphery of the communication hole 31.

[0051] Based on the above embodiments of the present application, by arranging the liquid leakage prevention fence 4, the liquid leakage prevention fence 4 cooperates with the plate body 3 to form a containing groove structure, thereby playing a temporary storage role when electrolyte overflows, avoiding electrolyte leakage from the edge of the plate body 3, and further improving the protection effect of the overflow protection workpiece on electrolyte overflow, and reducing the probability of electrolyte overflow and corrosion of the structure of the battery cell pole.

[0052] At the same time, by arranging the liquid leakage prevention fence 4 at the outer periphery of the communication hole 31, when electrolyte overflows due to pressure during electrolyte injection, the electrolyte overflows from the position of the communication hole 31, and at this time, the overflowing electrolyte is also located around the communication hole 31, and by arranging the liquid leakage prevention fence 4 at the outer periphery of the communication hole 31, a containing groove structure is formed at the outer periphery of the communication hole 31 to contain the overflowing electrolyte.

[0053] In the present application, the specific arrangement position and arrangement mode of the liquid leakage prevention fence 4 can be selected as any suitable arrangement. In an exemplary embodiment provided in the present application,

[0054] In an example embodiment provided in the present application, a liquid leakage prevention fence 4 is independently arranged at the periphery of each communication hole 31. During electrolyte injection, each communication hole 31 needs to be injected by a separate injection needle 11, and thus the sealing condition of each communication hole 31 and the possible liquid leakage condition are different. Therefore, by independently arranging a liquid leakage prevention fence 4 at the periphery of each communication hole 31, each communication hole 31 can be individually protected, and the serious liquid leakage caused by damage of a single communication hole 31 can be avoided, so as to affect the entire second electrolyte injection assembly 2. Thus, the liquid leakage is limited in the corresponding liquid leakage prevention fence 4, the possibility of corrosion of the cell pole caused by the flow of electrolyte to the cell position is reduced, and the production yield of the cell is improved.

[0055] Similarly, in some other example embodiments of the present application, a liquid leakage prevention fence 4 can be shared by every two communication holes 31. Compared with the mode of independently arranging a liquid leakage prevention fence 4 at the periphery of each communication hole 31, the number of liquid leakage prevention fences 4 can be reduced, and thus the production cost is reduced and the production efficiency is improved.

[0056] Alternatively, in another example embodiment provided in the present application, the liquid leakage prevention fence 4 can be arranged along the edge of the plate body 3.

[0057] Based on the above-mentioned embodiments of the present application, by arranging the liquid leakage prevention fence 4 at the edge of the plate body 3, the liquid leakage prevention fence 4 and the entire plate body 3 form a large containing groove structure, which can simultaneously contain the positions of multiple communication holes 31 on the plate body 3. At the same time, by arranging the liquid leakage prevention fence 4 at the edge of the plate body 3, the edge of the plate body 3 can be bent to form a fence structure protruding from the plate body 3 during the specific production and processing process, and then the structure joint positions of the plate body 3 on the adjacent side plates of the plate body 3 are fixed by welding or the like, so as to finally form the liquid leakage prevention fence 4.

[0058] Alternatively, the liquid leakage prevention fence can also be processed separately from the plate body 3, and then fixed by welding or gluing. The specific processing mode can be selected according to the strength requirement and other factors, and the present application does not make specific limitations.

[0059] Further, in some embodiments of the present application, the height of the liquid leakage prevention fence 4 protruding from the plate body 3 is H, and 5mm≤H≤20mm.

[0060] Based on the above-mentioned embodiments of the present application, by limiting the height of the liquid leakage prevention fence 4 protruding from the plate body 3, the problem of too little electrolyte that can be contained when the height of the liquid leakage prevention fence 4 is too low can be avoided. At the same time, the problem of too large overall volume of the liquid leakage prevention fence that causes inconvenience in assembly and use when the height of the liquid leakage prevention fence is too high can be avoided. In specific use, the height of the liquid leakage prevention fence 4 can be set to 5mm, 10mm, 15mm, 20mm and other specific heights.

[0061] Specifically, after the liquid leakage prevention fence 4 is arranged, the liquid leakage prevention fence 4 and the plate body 3 jointly form a containing groove for containing the overflow electrolyte. At this time, the volume of the containing groove is the product of the area of the plate body 3 and the height of the liquid leakage prevention fence 4 protruding from the plate body 3, so under the condition that the area of the plate body 3 is constant, the volume of the containing groove can be controlled by controlling the height of the liquid leakage prevention fence 4 protruding from the plate body 3.

[0062] Further, when specifically arranged, the required volume of the containing groove can be estimated according to the cleaning period of the overflow protection workpiece and the approximate amount of electrolyte overflow in the corresponding period, and then the height of the liquid leakage prevention fence 4 protruding from the plate body 3 is arranged according to the required volume of the containing groove.

[0063] Alternatively, in some other embodiments of the present application, in order to form a containing groove structure for containing electrolyte on the plate body 3, a concave structure can be arranged on the plate body 3, and the specific concave structure can be arranged as a circular planar structure or a circular conical surface structure.

[0064] Reference Figure 1 As shown in the above, in some embodiments of the present application, the plate body 3 can also be provided with an avoiding groove 5, and the avoiding groove 5 is used to avoid at least one of the negative pressure liquid injection pipeline, the pipeline mounting bracket or the cup assembly structure.

[0065] Based on the above embodiments of the present application, the liquid injection structure such as the first liquid injection assembly 1 and the second liquid injection assembly 2 generally includes a hydraulic drive structure and a negative pressure liquid injection structure when used in specific, and the above structure needs to be matched with the corresponding pipeline structure when used in specific. By arranging the avoiding groove 5, the above pipeline structure can flow out of the avoiding position when the overflow protection workpiece is assembled, so that the overflow protection workpiece can better cooperate with the first liquid injection assembly 1 and the second liquid injection assembly 2.

[0066] Specifically, in the present application, when the first liquid injection assembly 1 injects liquid to the second liquid injection assembly 2, the liquid injection needle 11 and other structures need to be correspondingly moved and inserted into the flow guide hole 22, at this time, a hydraulic drive structure generally needs to be matched to drive the movement of the liquid injection needle 11 and other structures. At the same time, the second liquid injection assembly 2 generally adopts a negative pressure liquid injection structure when injecting cooling liquid into the battery cell, so a negative pressure liquid injection pipeline needs to be correspondingly arranged. At the same time, in order to avoid the influence of pipeline disorder on liquid injection, a pipeline mounting bracket and other structures generally need to be arranged. Further, the connection between the first liquid injection assembly 1 and the second liquid injection assembly 2 also needs to be arranged with a cup assembly structure. By arranging the avoiding groove 5, space can be left for the arrangement of the above hydraulic pipeline and pneumatic pipeline. The avoiding groove 5 can be arranged according to the number and position of the corresponding pipeline when arranged, and the present application does not make specific limitations in this regard.

[0067] Further, in the present application, the specific position of the avoidance groove 5 can be selected in any suitable manner. Referring to Figure 1 In an exemplary embodiment provided in the present application, the avoidance groove 5 can be arranged at the edge position of the plate body 3.

[0068] Based on the above embodiments of the present application, by arranging the avoidance groove 5 at the edge position of the plate body 3, the corresponding negative pressure liquid injection pipeline, pipeline mounting bracket or cup assembly structure only needs to be clamped with the avoidance groove 5 position during the assembly and fixation of the overflow protection workpiece. At the same time, arranging the avoidance groove 5 at the edge of the plate body 3 is also convenient for processing.

[0069] Specifically, when the avoidance groove 5 is opened at the middle position of the plate body 3, for example, when the negative pressure liquid injection pipeline needs to pass through the avoidance, at this time the negative pressure liquid injection pipeline needs to pass through the avoidance groove 5, so that at least a part of the negative pressure liquid injection pipeline needs to be disassembled, and the connection and disassembly process of part of the pipeline is relatively cumbersome, resulting in a cumbersome and time-consuming entire assembly process. By arranging the avoidance groove 5 at the edge of the plate body 3, when the negative pressure liquid injection pipeline needs to cooperate with the avoidance groove 5 position, only the negative pressure liquid injection pipeline needs to be clamped into the avoidance groove 5 from the side opening position of the avoidance groove 5, and the assembly process is simple and convenient.

[0070] In the present application, the plate body 3 and the second liquid injection assembly 2 can be fixed in any suitable manner to avoid movement of the overflow protection workpiece during use affecting the protection effect.

[0071] Referring to Figure 1 In an exemplary embodiment provided in the present application, a connecting hole 6 can be arranged on the plate body 3 to connect the plate body 3 and the second liquid injection assembly 2 through bolt connection.

[0072] Based on the above embodiments of the present application, by arranging the connecting hole 6, the plate body 3 and the second liquid injection assembly 2 are fixed through bolt connection. It can avoid the problem of protection failure caused by the movement of the plate body 3 during the liquid injection process. The bolt connection method not only has a simple and convenient connection process, but also facilitates the later disassembly and replacement.

[0073] Specifically, in order to avoid liquid leakage from the position where the connecting hole 6 is located, in some embodiments of the present application, a rubber ring or the like structure can be arranged at the position where the connecting hole 6 is located, and the rubber ring is arranged coaxially with the connecting hole 6, thereby sealing the connecting hole 6 position to a certain extent. At the same time, after the bolt is tightened, the rubber ring can be compressed, thereby further improving the sealing effect of the rubber ring.

[0074] Alternatively, the position where the connecting hole 6 is located can be arranged to be slightly protruding from the surrounding area, thereby reducing the possibility of liquid leakage from the connecting hole 6 and improving the overall protection effect of the overflow protection workpiece.

[0075] On the basis of the above technical solutions, according to the second aspect of the present application, a liquid injection device is provided, as shown in Figure 3 and Figure 4 , the liquid injection device comprises a first liquid injection assembly 1, a second liquid injection assembly 2, and the above-mentioned overflow protection workpiece, which is arranged on the surface of the second liquid injection assembly 2 facing the first liquid injection assembly 1.

[0076] Based on the above-mentioned embodiments of the present application, the liquid injection device of the present application is used, and the electrolyte is first injected from the first liquid injection assembly 1 into the second liquid injection assembly 2, and then injected into the battery cell by negative pressure injection and the like. In this process, the liquid injection device provided by the present application comprises the above-mentioned overflow protection workpiece, by arranging the overflow protection workpiece on the surface of the second liquid injection assembly 2, the injection position can be closed and protected when the first liquid injection assembly 1 injects the electrolyte into the second liquid injection assembly 2, so as to avoid the electrolyte from dropping onto the battery cell position after the electrolyte overflow, causing the corrosion of the battery cell pole and other structures, and affecting the production and processing yield.

[0077] Specifically, in the prior art, during the injection process, the battery cell is directly arranged below the second liquid injection assembly 2, and when the electrolyte is injected from the first liquid injection assembly 1 into the second liquid injection assembly 2, the electrolyte will overflow or splash due to sealing problems, and the splashed electrolyte will directly fall onto the battery cell, and the overflowed electrolyte will flow along the second liquid injection assembly 2 and drop onto the battery cell.

[0078] And by arranging the overflow protection workpiece in the present application, the splashed electrolyte will directly splash onto the upper surface of the plate body 3 and be collected by the plate body 3, and at the same time, the plate body 3 closes the position of the flow guide hole 22, so that the electrolyte cannot continue to flow downward to the battery cell, thereby reducing the possibility of electrolyte dropping onto the battery cell position from two aspects, avoiding the corrosion of the electrolyte to the battery cell pole and other structures, and improving the production yield of the battery cell.

[0079] Referring to Figure 3 and Figure 4 , in some embodiments of the present application, the first liquid injection assembly 1 can further comprise a liquid injection needle 11, the end of the liquid injection needle 11 can be inserted into the flow guide hole 22, and the middle of the liquid injection needle 11 is provided with a connecting block 12, the size of the connecting block 12 is larger than that of the liquid injection needle 11. The size of the communication hole 31 is larger than that of the flow guide hole 22, and when the end of the liquid injection needle 11 is inserted into the flow guide hole 22, the outer periphery of the connecting block 12 abuts against the inner wall of the communication hole 31.

[0080] Based on the above embodiments of the present application, when the liquid injection is performed from the first liquid injection assembly 1 to the second liquid injection assembly 2, the end of the liquid injection needle 11 is inserted into the flow guide hole 22, which can reduce the probability of electrolyte splashing to a certain extent. Meanwhile, the connecting block 12 cooperates with the communication hole 31 to close the liquid injection position, thereby further reducing the possibility of liquid overflow.

[0081] Specifically, when the liquid injection needle 11 is used, the end of the liquid injection needle 11 is inserted into the flow guide hole 22, and the outer periphery of the connecting block 12 is in contact with the inner wall of the communication hole 31, thereby closing the position of the communication hole 31 and avoiding liquid leakage from the position of the communication hole 31.

[0082] Further, in some embodiments of the present application, a flexible sealing pad can be arranged on the surface of the connecting block 12 facing the second liquid injection assembly 2.

[0083] Based on the above embodiments of the present application, when the first liquid injection assembly 1 and the second liquid injection assembly 2 are in contact for liquid injection, the flexible sealing pad can be deformed to a certain extent under pressure, thereby further improving the closing effect of the liquid injection position and further reducing the possibility of liquid overflow.

[0084] The specific material of the flexible sealing pad can be rubber or foam. The flexible sealing pad made of rubber or foam can be fixed on the surface of the connecting block 12 facing the second liquid injection assembly 2 by gluing or the like.

[0085] In summary, based on the above arrangement of the present application, the specific use process of the liquid injection device in the present application is as follows: first, the liquid overflow protection workpiece is arranged on the top of the second liquid injection assembly 2, and the communication hole 31 and the flow guide hole 22 are aligned, then the bolt passes through the connecting hole 6 to bolt the liquid overflow protection workpiece and the second liquid injection assembly 2. After fixing the liquid overflow protection workpiece, the liquid injection needle 11 is inserted into the flow guide hole 22 to inject electrolyte into the second liquid injection assembly 2, and then the electrolyte is injected into the battery cell by negative pressure injection or the like. In this process, the flow guide hole 22 and other positions are closed by the liquid overflow protection workpiece to prevent the electrolyte from splashing or overflowing to the battery cell position, thereby ensuring the protection of the battery cell during the liquid injection process.

[0086] The preferred embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all belong to the protection scope of the present application.

[0087] It should be further noted that the various technical features described in the above specific embodiments can be combined in any suitable manner, and the application is not limited to the combinations explicitly described. In order to avoid unnecessary repetition, the various possible combinations are not described separately in the application.

[0088] Furthermore, the various different embodiments of the application can also be combined with each other in any suitable manner, as long as it does not deviate from the idea of the application, it should also be considered as disclosed in the application.

Claims

1. A spill guard workpiece, comprising: The first liquid injection assembly comprises a liquid injection needle, and the second liquid injection assembly comprises a plurality of liquid injection cups arranged in parallel and having a gap between adjacent two liquid injection cups; The overflow protection workpiece comprises a plate body which is attached to the same side of the plurality of liquid injection cups and covers the gap; A communication hole is arranged on the plate body and is matched with a flow guide hole arranged on the liquid injection cup; When the first liquid injection assembly and the second liquid injection assembly are communicated, the liquid injection needle can block and close the flow guide hole in cooperation with the communication hole.

2. The overflow containment workpiece of claim 1, wherein When the first liquid injection assembly and the second liquid injection assembly are communicated, the liquid injection needle is at least partially inserted into the communication hole, and the shape of the outer circumferential surface of the inserted part of the liquid injection needle is matched with the shape of the inner wall of the communication hole.

3. The overflow containment workpiece of claim 1, wherein, The overflow protection workpiece further comprises a liquid leakage prevention fence which is arranged on the outer circumferential side of the communication hole.

4. The overflow containment workpiece of claim 3, wherein, The liquid leakage prevention fence is arranged along the edge of the plate body.

5. The overflow containment workpiece of claim 3, wherein, The height of the liquid leakage prevention fence protruding from the plate body is H, and 5mm≤H≤20mm.

6. The overflow containment workpiece of claim 1, wherein An avoiding groove is arranged on the plate body, and the avoiding groove is used for avoiding at least one of a negative pressure liquid injection pipeline, a pipeline mounting bracket or a cup body assembly structure.

7. The overflow containment workpiece of claim 6, wherein The avoiding groove is arranged at the edge of the plate body.

8. The overflow containment workpiece of claim 1, wherein A connecting hole is arranged on the plate body, and the plate body and the second liquid injection assembly are connected through bolt connection.

9. A liquid injection apparatus characterized by comprising: The liquid injection equipment comprises: a first liquid injection assembly and a second liquid injection assembly; and The overflow protection workpiece according to any one of claims 1-8 is arranged on the surface of the second liquid injection assembly facing the first liquid injection assembly.

10. The liquid injection apparatus according to claim 9, wherein The first liquid injection assembly comprises a liquid injection needle, and the liquid injection needle is capable of being inserted into the flow guide hole at the end thereof, and a connecting block is arranged in the middle of the liquid injection needle, and the connecting block has a size larger than the liquid injection needle; The communication hole has a size larger than the flow guide hole, and the outer circumferential surface of the connecting block abuts against the inner wall of the communication hole when the end of the liquid injection needle is inserted into the flow guide hole.

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