Battery cell lower plastic plate structure for liquid injection and diversion

Abstract

According to the liquid injection and diversion battery cell lower plastic plate structure, in the structure, a lower plastic plate comprises a horizontal plate and positioning supporting structures vertically extending downwards from the two sides of the horizontal plate, a pole penetrating hole is formed in the horizontal plate in a penetrating mode, a liquid injection hole is formed in the horizontal plate in a penetrating mode, an exhaust valve penetrating hole is formed in the horizontal plate in a penetrating mode, and a plurality of diversion part fixing holes are formed in the horizontal plate in a penetrating mode and surround the liquid injection hole; the inner enclosing wall extends upwards from the flow guide part, the inner enclosing wall has a first height, the outer enclosing wall extends upwards from the flow guide part and encloses the inner enclosing wall, the outer enclosing wall has a second height, a flow guide groove is formed between the inner enclosing wall and the outer enclosing wall, and the multiple connecting buckles are arranged at the top of the inner enclosing wall and are connected with the flow guide part fixing holes in a clamped mode. According to the structure, the infiltration effect of the core cladding central area is improved, and the available space in the battery core is not extruded.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a plastic plate structure under a battery cell for liquid injection and flow diversion. Background Art

[0002] As an important component of existing liquid lithium-ion batteries, the electrolyte is mainly used to achieve mutual conduction of lithium ions between active materials. In the actual manufacturing process of square battery cells, the electrolyte is usually injected into the internal core package through a small injection hole because of the need to consider the structural sealing.

[0003] The compact and fitted internal core package design makes it slower for the electrolyte to infiltrate the active material layer, diaphragm and other parts, greatly increasing the time of the injection process; in addition, because the injection opening is usually perpendicular to one side of the core package, the central area of ​​the core package relies on the diffusion of the electrolyte in the battery shell itself, which will affect the ion conductivity of the area to some extent, and easily cause the risk of high local impedance and greater heat generation during actual use.

[0004] In addition, in order to prevent the electrolyte from impacting the core package diaphragm area below the injection hole during the injection process, thereby causing the diaphragm to be dislocated at the impact point and causing a short circuit, a baffle structure is added at the bottom of the injection hole of the lower plastic plate to avoid this.

[0005] Patents CN116454566 and CN116487782A of the prior art respectively designed a guide piece connected to the bottom of the lower plastic plate, which realizes the function of electrolyte injection diversion and preventing injection impact, and improves the wetting efficiency of the battery cell to a certain extent. However, the actual injection flow rate is low, and it is difficult to achieve the flow blocking sputtering effect. There are still deficiencies in improving the injection diversion and large-scale wetting efficiency in the center of the battery core package. The prior art is equipped with a refilling pipeline to directly divert the electrolyte to the middle of the battery cell, optimize the pain point that the middle of the battery cell is difficult to infiltrate, and improve the injection infiltration efficiency. However, the structure is relatively complex, the injection molding cost is high, and the available space in the height direction inside the battery cell is severely compressed.

[0006] The above information disclosed in the background technology section is only used to enhance the understanding of the background of the present invention and therefore may contain information that does not constitute the prior art known to ordinary technicians in this field. Utility Model Content

[0007] The utility model aims to provide a plastic plate structure under the battery cell for liquid injection and diversion, which optimizes the diversion effect of electrolyte injection through the structure of the plastic plate under the battery cell, so as to improve the infiltration effect of the central area of ​​the core package, reduce the process time and improve safety; it does not affect the function of the lower plastic plate, does not squeeze the available space inside the battery cell, and has a simple overall structure, low cost and easy assembly.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] The utility model provides a plastic plate structure under a battery cell for liquid injection and flow guidance, comprising:

[0010] The lower plastic plate includes a horizontal plate and positioning support structures extending vertically downward from both sides of the horizontal plate.

[0011] The pole through hole is provided through the horizontal plate,

[0012] A liquid injection hole is provided through the horizontal plate,

[0013] The exhaust valve hole is provided through the horizontal plate.

[0014] A plurality of guide member fixing holes, which penetrate the horizontal plate and surround the liquid injection hole;

[0015] A flow guide, comprising:

[0016] an inner enclosing wall extending upward from the flow guide, wherein the inner enclosing wall has a first height,

[0017] an outer closing wall extending upward from the flow guide member and enclosing the inner closing wall, the outer closing wall having a second height, and a flow guide groove being formed between the inner closing wall and the outer closing wall,

[0018] A plurality of connection buckles are arranged on the top of the inner enclosure wall and the connection buckles are engaged with the fixing holes of the flow guide member.

[0019] In the plastic plate structure under the battery cell for liquid injection and flow diversion, the liquid injection hole is aligned with the flow diversion groove.

[0020] In the plastic plate structure under the battery cell with liquid injection and flow diversion, the first height is greater than the second height.

[0021] In the plastic plate structure under the battery cell for liquid injection and flow diversion, the inner enclosing wall and the outer enclosing wall are both rectangular structures.

[0022] In the plastic plate structure under the battery cell with liquid injection and flow diversion, the positioning support structure is a rectangular block.

[0023] In the plastic plate structure under the battery cell for liquid injection and flow diversion, the liquid injection hole is located in the central area of ​​the horizontal plate and the plurality of flow guide fixing holes are located between the two pole through holes.

[0024] In the plastic plate structure under the battery cell with liquid injection and flow diversion, the diversion groove is kept in a horizontal state.

[0025] In the plastic plate structure under the battery cell for liquid injection and flow diversion, the outer combined wall is provided with an outward chamfered structure.

[0026] In the plastic plate structure under the battery cell for liquid injection and flow diversion, the exhaust valve perforation is located between the plurality of guide member fixing holes.

[0027] In the plastic plate structure under the battery cell for liquid injection and flow diversion, the plastic plate structure under the battery cell is a symmetrical structure.

[0028] In the above technical scheme, the utility model provides a plastic plate structure under the battery cell for liquid injection and diversion, which has the following beneficial effects: the structural combination of the utility model has low manufacturing cost and does not squeeze the available space inside the battery cell; it can achieve large-area synchronous infiltration of the center area of ​​the battery cell and improve the core package infiltration efficiency; it can effectively prevent the safety risks caused by the impact of electrolyte injection on the core package and can increase the injection flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0030] Figure 1 The present invention is a schematic diagram of the overall structure of a plastic plate structure under a battery cell for liquid injection and flow diversion provided in an embodiment of the present invention.

[0031] Figure 2 A schematic diagram of a lower plastic plate structure of a battery cell with liquid injection and flow diversion provided in an embodiment of the utility model.

[0032] Figure 3 A schematic diagram of the structure of a flow guide member of a plastic plate structure under a battery cell for liquid injection and flow diversion provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] See also Figure 1-3 As shown, in one embodiment, a plastic plate structure under a battery cell for liquid injection and flow diversion of the utility model includes:

[0042] The lower plastic plate 101 includes a horizontal plate and positioning support structures 102 extending vertically downward from both sides of the horizontal plate.

[0043] The pole through hole 103 is provided through the horizontal plate.

[0044] The injection hole 105 is provided through the horizontal plate.

[0045] The exhaust valve through hole 106 is provided through the horizontal plate.

[0046] A plurality of guide member fixing holes 104 are provided through the horizontal plate and surround the injection hole 105;

[0047] The flow guide 201 includes:

[0048] An inner enclosing wall extending upward from the flow guide 201, wherein the inner enclosing wall has a first height,

[0049] The outer wall extends upward from the guide member 201 and surrounds the inner wall. The outer wall has a second height. A guide groove 203 is formed between the inner wall and the outer wall.

[0050] A plurality of connection buckles 202 are disposed on the top of the inner enclosure wall and the connection buckles 202 are engaged with the guide member fixing holes 104 .

[0051] In a preferred embodiment of the plastic plate structure under the battery cell for liquid injection and flow diversion, the liquid injection hole 105 is aligned with the flow diversion groove 203 .

[0052] In a preferred embodiment of the plastic plate structure under the battery cell for liquid injection and flow guidance, the first height is greater than the second height.

[0053] In a preferred embodiment of the plastic plate structure under the battery cell for liquid injection and flow diversion, the inner enclosing wall and the outer enclosing wall are both rectangular structures.

[0054] In the preferred embodiment of the plastic plate structure under the battery cell for liquid injection and flow guidance, the positioning support structure 102 is a rectangular block.

[0055] In a preferred embodiment of the plastic plate structure under the battery cell for liquid injection and flow diversion, the liquid injection hole 105 is located in the central area of ​​the horizontal plate and the plurality of guide member fixing holes 104 are located between the two pole through holes 103 .

[0056] In the preferred embodiment of the plastic plate structure under the battery cell for liquid injection and flow diversion, the diversion groove 203 is kept in a horizontal state.

[0057] In a preferred embodiment of the plastic plate structure under the battery cell for liquid injection and flow diversion, the outer wall is provided with an outward chamfered structure.

[0058] In the preferred embodiment of the plastic plate structure under the battery cell for liquid injection and flow diversion, the exhaust valve through hole 106 is located between the plurality of guide member fixing holes 104 .

[0059] In a preferred embodiment of the plastic plate structure under the battery cell for liquid injection and flow diversion, the plastic plate structure under the battery cell is a symmetrical structure.

[0060] In one embodiment, the guide member 201 has a horizontal bottom plate, and the inner enclosing wall and the outer enclosing wall both extend upward from the bottom plate and share a common central axis.

[0061] In one embodiment, Figure 1 As shown, the lower plastic plate structure of the battery cell for liquid injection and flow diversion is suitable for a square battery cell with a single-side double pole, and is respectively composed of a lower plastic plate 101 and a flow guide 201; the lower plastic plate 101 includes a positioning support structure 102, a pole through hole 103, a flow guide fixing hole 104, a liquid injection hole 105, and an exhaust valve through hole 106; the flow guide 201 includes a connecting buckle 202 and a flow guide groove 203. The flow guide fixing hole 104 and the connecting buckle 202 are connected up and down by buckling and hot welding; in addition, the liquid injection hole 105 is ensured to be positioned with the flow guide groove 203 in the vertical direction.

[0062] During use, the upper electrolyte flows into the guide groove 203 through the injection hole 105. Since the outer side of the guide groove is relatively low in height and is provided with a chamfered structure, when the groove is filled with electrolyte, it will be evenly guided along the outer side to the surrounding area of ​​the middle area of ​​the battery cell to achieve large-area synchronous infiltration and improve the infiltration efficiency.

[0063] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0064] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A plastic plate structure under a battery cell for liquid injection and flow diversion, characterized in that: These include, The lower plastic plate includes a horizontal plate and positioning support structures extending vertically downward from both sides of the horizontal plate. The pole through hole is provided through the horizontal plate, A liquid injection hole is provided through the horizontal plate, The exhaust valve hole is provided through the horizontal plate. A plurality of guide member fixing holes, which penetrate the horizontal plate and surround the liquid injection hole; A flow guide, comprising: an inner enclosing wall extending upward from the flow guide, wherein the inner enclosing wall has a first height, an outer closing wall extending upward from the flow guide member and enclosing the inner closing wall, the outer closing wall having a second height, and a flow guide groove being formed between the inner closing wall and the outer closing wall, A plurality of connection buckles are arranged on the top of the inner enclosure wall and the connection buckles are engaged with the fixing holes of the flow guide member.

2. A plastic plate structure under a battery cell with liquid injection and flow guidance according to claim 1, characterized in that: The injection hole is aligned with the guide groove.

3. The plastic plate structure under the battery cell with liquid injection and flow diversion according to claim 1, characterized in that: The first height is greater than the second height.

4. The plastic plate structure under the battery cell with liquid injection and flow guidance according to claim 1, characterized in that: The inner enclosing wall and the outer enclosing wall are both rectangular structures.

5. The plastic plate structure under the battery cell with liquid injection and flow guidance according to claim 1, characterized in that: The positioning support structure is a rectangular block.

6. The plastic plate structure under the battery cell with liquid injection and flow guidance according to claim 1, characterized in that: The injection hole is located in the central area of ​​the horizontal plate and the plurality of guide member fixing holes are located between the two pole through holes.

7. The plastic plate structure under the battery cell with liquid injection and flow guidance according to claim 1, characterized in that: The guide groove maintains a horizontal state.

8. The plastic plate structure under the battery cell with liquid injection and flow guidance according to claim 1, characterized in that: The peripheral combined wall is provided with an outward chamfered structure.

9. The plastic plate structure under the battery cell with liquid injection and flow guidance according to claim 1, characterized in that: The exhaust valve through hole is located between the plurality of guide member fixing holes.

10. The plastic plate structure under the battery cell with liquid injection and flow guidance according to claim 1, characterized in that: The plastic plate structure under the battery cell is a symmetrical structure.

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