Plastic part, cover plate assembly and battery cell

Abstract

The utility model provides a plastic part, a cover plate assembly and a battery cell, and relates to the technical field of batteries. The plastic part comprises a main body part and a first supporting part which are connected with each other, part of the first supporting part protrudes in the first direction relative to the main body part, a first containing cavity is defined by the first supporting part, first dispersing holes communicated with the first containing cavity are formed in the first supporting part, and a second containing cavity is defined by the main body part; a second dispersing hole communicated with the second accommodating cavity is formed in the main body part, and the first accommodating cavity is communicated with the second accommodating cavity. During liquid injection, electrolyte can flow to the pole group through the first accommodating cavity and the first dispersing holes. When the first dispersion hole is blocked by the diaphragm, the electrolyte in the first accommodating cavity overflows to the second accommodating cavity, and the electrolyte can flow to the pole group through the second dispersion hole, so that the problems that the liquid injection efficiency is reduced and the liquid injection time is prolonged due to the fact that the first dispersion hole is blocked are avoided. And when the diaphragm blocks the first dispersion holes, the electrolyte can flow to the pole group, so that the risk that the electrolyte overflows is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a plastic part, a cover assembly, and a battery cell. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are being used more and more widely in various fields.

[0003] The cover plate assembly is a crucial component of the battery cell. It typically consists of a bare aluminum plate and a lower plastic part. The lower surface of the lower plastic part abuts against the electrode assembly, thus limiting its movement. The bare aluminum plate has injection holes for injecting electrolyte. To allow the electrolyte to flow to the electrode assembly, dispersion holes are provided on the lower plastic part at positions corresponding to the injection holes.

[0004] However, because the electrode assembly abuts against the lower surface of the lower plastic part, the diaphragm in the electrode assembly can adhere to the dispersion holes of the lower plastic part. This diaphragm can block the dispersion holes, making it difficult for the electrolyte to pass through, reducing the efficiency of electrolyte injection and increasing the injection time. At the same time, the uneven electrolyte injection increases the risk of electrolyte overflow during injection. Utility Model Content

[0005] In view of this, this application provides a plastic part, a cover plate assembly, and a battery cell to solve the problems of diaphragms in the electrode assembly adhering to the dispersion holes of the lower plastic, which blocks the dispersion holes, making it difficult for the electrode liquid to pass through the dispersion holes, reducing the efficiency of electrolyte injection, increasing the injection time, and causing electrolyte injection to be unsmooth, resulting in a greater risk of electrolyte overflow during injection.

[0006] According to a first aspect of this application, a plastic part is provided, the plastic part including a main body portion and a first support portion connected to each other, a portion of the first support portion protruding relative to the main body portion along a first direction, the first support portion enclosing a first receiving cavity, the first support portion having a first dispersing hole communicating with the first receiving cavity, the main body portion enclosing a second receiving cavity, the main body portion having a second dispersing hole communicating with the second receiving cavity, and the first receiving cavity communicating with the second receiving cavity.

[0007] Preferably, the main body includes a first fitting plane, the first support includes a second fitting plane, the first fitting plane is flush with the second fitting plane, and the first direction is perpendicular to the first fitting plane.

[0008] Preferably, the second receiving cavity has a dimension of 1.5mm-2.3mm in the first direction.

[0009] Preferably, the portion of the first support portion that protrudes relative to the main body portion has a dimension of 3.3mm-4.1mm in the first direction.

[0010] Preferably, the plastic part includes an abutment member connected to the cavity wall of the second receiving cavity, and the end of the abutment member in the first direction is flush with the first mating plane.

[0011] Preferably, the abutting member includes a first abutting portion and a second abutting portion, the first abutting portion and the second abutting portion are connected, and the extending direction of the first abutting portion intersects the extending direction of the second abutting portion.

[0012] Preferably, the plastic part further includes a second support portion, which is connected to one end of the main body opposite to the first support portion, and a portion of the second support portion protrudes relative to the main body along the first direction.

[0013] Preferably, the second support portion encloses a connecting cavity, and the second support portion has a drain hole that communicates with the connecting cavity.

[0014] According to a second aspect of this application, a cover plate assembly is provided, the cover plate assembly including a cover plate body, an injection hole and the aforementioned plastic part, the injection hole being disposed on the cover plate body, the cover plate body being fitted with the plastic part, and the injection hole facing the first receiving cavity.

[0015] According to a third aspect of this application, a battery cell is provided, the battery cell including an electrode group and the aforementioned cover plate assembly, wherein a first support portion abuts against the electrode group, and the main body portion is arranged at a distance from the electrode group.

[0016] When the plastic part of this application is used in a battery cell, the first support portion of the plastic part protrudes relative to the main body portion, so that only the first support portion abuts against the electrode group, the main body portion and the electrode group are spaced apart, and the injection hole on the cover plate body faces the first receiving cavity. During injection, the electrolyte can flow to the electrode group through the first receiving cavity and the first dispersion hole. When the first dispersion hole is blocked by the diaphragm, the electrolyte in the first receiving cavity overflows into the second receiving cavity, which allows the electrolyte to flow to the electrode group through the second dispersion hole, avoiding the problems of reduced injection efficiency and increased injection time caused by the blockage of the first dispersion hole. When the diaphragm blocks the first dispersion hole, the electrolyte can flow to the electrode group, reducing the risk of electrolyte overflow. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A three-dimensional structural diagram of the plastic part from one perspective is shown;

[0019] Figure 2 A three-dimensional structural diagram showing another perspective of the plastic part;

[0020] Figure 3 A cross-sectional view of the cover plate assembly is shown;

[0021] Figure 4 A schematic diagram of the planar structure of the battery cell is shown;

[0022] Figure 5 Show Figure 4 A cross-sectional view of the battery cell taken along line A-A';

[0023] Figure 6 Show Figure 5 Enlarged view of section B.

[0024] Icons: 1-Plastic part; 11-Main body; 111-Second receiving cavity; 112-Second dispersion hole; 12-First support part; 121-First receiving cavity; 122-First dispersion hole; 13-Second support part; 131-Connecting cavity; 132-Liquid outlet hole; 14-Abutting part; 141-First abutting part; 142-Second abutting part; 2-Cover plate body; 3-Injection hole; 4-Shell; 5-Electrode assembly; S1-First mating plane; S2-Second mating plane; S3-Third mating plane; L1-First direction; L2-Second direction; L3-Third direction. Detailed Implementation

[0025] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0026] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0027] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0028] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0029] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0030] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0031] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0032] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0033] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0034] The following will combine Figures 1 to 6 The present application describes the plastic part 1, the cover assembly, and the battery cell. Figures 1 to 6 In the middle, the first direction L1, the second direction L2, and the third direction L3 are perpendicular to each other. The first direction L1 is parallel to the length direction of the battery cell, the second direction L2 is parallel to the width direction of the battery cell, and the third direction L3 is parallel to the thickness direction of the battery cell.

[0035] According to the first aspect of this application, a plastic part 1 is provided, such as... Figure 1 and Figure 2 As shown, the plastic part 1 includes a main body 11 and a first support 12 connected to each other. A portion of the first support 12 protrudes from the main body 11 along a first direction L1. The first support 12 encloses a first receiving cavity 121 and has a first dispersion hole 122 communicating with the first receiving cavity 121. The main body 11 encloses a second receiving cavity 111 and has a second dispersion hole 112 communicating with the second receiving cavity 111. The first receiving cavity 121 and the second receiving cavity 111 are connected.

[0036] When plastic part 1 is used in the battery cell, such as Figure 3 and Figure 6As shown, the first support portion 12 of the plastic part 1 protrudes relative to the main body portion 11, so that only the first support portion 12 abuts against the electrode group 5. The main body portion 11 and the electrode group 5 are arranged at intervals, and the injection hole 3 on the cover plate body 2 faces the first receiving cavity 121. During injection, the electrolyte can flow to the electrode group 5 through the injection hole 3, the first receiving cavity 121, and the first dispersion hole 122. When the first dispersion hole 122 is blocked by the diaphragm in the electrode group 5, the electrolyte in the first receiving cavity 121 overflows into the second receiving cavity 111, which allows the electrolyte to flow to the electrode group 5 through the second dispersion hole 112, avoiding the problems of reduced injection efficiency and increased injection time caused by the blockage of the first dispersion hole 122. When the diaphragm blocks the first dispersion hole 122, the electrolyte can flow to the electrode group 5, reducing the risk of electrolyte overflow.

[0037] In the embodiments of this application, such as Figure 1 and Figure 2 As shown, the plastic part 1 also includes a second support portion 13. The two ends of the main body portion 11 in the second direction L2 are connected to the first support portion 12 and the second support portion 13 respectively. The two ends of the main body portion 11 in the third direction L3 are flush with the two ends of the first support portion 12 in the third direction L3, and the two ends of the main body portion 11 in the third direction L3 are flush with the two ends of the second support portion 13 in the third direction L3. The main body portion 11 includes a first mating plane S1, the first support portion 12 includes a second mating plane S2, and the second support portion 13 includes a third mating plane S3. The first mating plane S1, the second mating plane S2, and the third mating plane S3 are flush with each other. The first mating plane S1, the second mating plane S2, and the third mating plane S3 are all perpendicular to the first direction L1. The first mating plane S1, the second mating plane S2, and the third mating plane S3 can be mated with the cover plate body 2.

[0038] Furthermore, the first support portion 12 is a hollow, groove-shaped structure, thereby enclosing a first receiving cavity 121. The bottom of the first support portion 12 has multiple through-holes 122, which are spaced apart and communicate with the first receiving cavity 121. The portion of the main body 11 near the end of the first support portion 12 is recessed relative to the first mating plane S1 towards the interior of the main body 11, thereby enclosing a second receiving cavity 111, connecting the first receiving cavity 121 and the second receiving cavity 111. The bottom of the recessed portion of the main body 11 has multiple second dispersing holes 112, each of which communicates with the second receiving cavity 111.

[0039] Furthermore, the second support portion 13 can also be a hollow, groove-shaped structure, thereby enclosing the connecting cavity 131. The bottom of the second support portion 13 has multiple liquid outlet holes 132, all of which communicate with the connecting cavity 131. During the electrolyte injection process, the electrolyte may flow into the connecting cavity 131. At this time, the electrolyte can flow to the electrode assembly 5 through the liquid outlet holes 132, thereby preventing electrode liquid overflow.

[0040] Optionally, the dimension a of the second receiving cavity 111 in the first direction L1 is 1.5mm-2.3mm. For example, the dimension a of the second receiving cavity 111 in the first direction L1 can be 1.5mm, 1.6mm, 1.8mm, 2.0mm, 2.1mm, 2.2mm, or 2.3mm, etc. Preferably, the dimension a of the second receiving cavity 111 in the first direction L1 is 2.3mm.

[0041] Optionally, such as Figure 3 and Figure 6 As shown, the dimension b of the portion of the first support 12 protruding relative to the main body 11 in the first direction L1 is 3.3mm-4.1mm. In other words, when the plastic part 1 is installed into the battery cell, the first support 12 abuts against the electrode group 5, and the space between the main body 11 and the electrode group 5 in the first direction L1 is 3.3mm-4.1mm. For example, the dimension b of the portion of the first support 12 protruding relative to the main body 11 in the first direction L1 can be 3.3mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 4.0mm, or 4.1mm, etc. Preferably, the dimension b of the portion of the first support 12 protruding relative to the main body 11 in the first direction L1 is 3.3mm.

[0042] In the embodiments of this application, such as Figure 1 As shown, the plastic part 1 includes an abutment 14, which is connected to the cavity wall of the second receiving cavity 111. The end of the abutment 14 in the first direction L1 is flush with the first mating plane S1. In this way, the abutment 14 can fit against the cover plate body 2, and the abutment 14 can serve to support the plastic part 1.

[0043] Optionally, the abutment 14 includes a first abutment portion 141 and abutment portion 142, the first abutment portion 141 and the second abutment portion 142 are connected, the extension direction of the first abutment portion 141 intersects the extension direction of the second abutment portion 142, and the strength of the support for the plastic part 1 is further improved through the first abutment portion 141 and the second abutment portion 142.

[0044] Preferably, the first abutment portion 141 is plate-shaped, and the second abutment portion 142 is also plate-shaped. There are two of each of the first abutment portions 141 and the second abutment portion 142. The two first abutment portions 141 are parallel and perpendicular to the third direction L3. The two second abutment portions 142 are parallel and perpendicular to the second direction L2. The ends of the first abutment portions 141 and the second abutment portions 142 facing away from the first contact plane S1 are connected to the bottom wall of the second receiving cavity 111. The end of the first abutment portion 141 facing the first contact plane S1 is flush with the first contact plane S1, and the end of the second abutment portion 142 facing the first contact plane S1 is flush with the first contact plane S1. The first abutment 141 is connected at its first end in the second direction L2 to the cavity wall of the second receiving cavity 111. The two ends of the second abutment 142 in the third direction L3 are respectively connected to the middle of the two first abutment 141. The other second abutment 142 is connected to the second end of the two first abutment 141 in the second direction L2.

[0045] In the plastic part 1 of this application, by providing a second receiving cavity 111 and a second dispersion hole 112, the problems of reduced injection efficiency and increased injection time caused by the blockage of the first dispersion hole 122 are avoided. The electrolyte can flow to the electrode group 5, reducing the risk of electrolyte overflow.

[0046] According to a second aspect of this application, a cover plate assembly is provided, such as... Figure 3 As shown, the cover plate assembly includes a cover plate body 2, an injection hole 3, and the aforementioned plastic part 1. The injection hole 3 is disposed on the cover plate body 2, and the cover plate body 2 is fitted to the plastic part 1, with the injection hole 3 facing the first receiving cavity 121. During injection, the electrolyte can flow to the electrode group 5 through the first receiving cavity 121 and the first dispersion hole 122. When the first dispersion hole 122 is blocked by the diaphragm, the electrolyte in the first receiving cavity 121 overflows into the second receiving cavity 111, and the electrolyte can flow to the electrode group 5 through the second dispersion hole 112, avoiding the problems of reduced injection efficiency and increased injection time caused by the blockage of the first dispersion hole 122. When the first dispersion hole 122 is blocked, the electrolyte can flow to the electrode group 5, reducing the risk of electrolyte overflow.

[0047] According to a third aspect of this application, a battery cell is provided, such as... Figure 4 , Figure 5 and Figure 6 As shown, the battery cell includes an electrode assembly 5, a housing 4, and the aforementioned cover plate assembly. The cover plate assembly is connected to the housing 4. The electrode assembly 5 is disposed inside the housing 4. The first support portion 12 abuts against the electrode assembly 5, and the main body portion 11 is spaced apart from the electrode assembly 5. When the first dispersion hole 122 is blocked, the electrolyte can flow to the electrode assembly 5 through the second dispersion hole 112.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A plastic part, characterized in that, The plastic part includes a main body and a first support portion connected to each other. A portion of the first support portion protrudes from the main body in a first direction. The first support portion encloses a first receiving cavity and has a first dispersing hole communicating with the first receiving cavity. The main body encloses a second receiving cavity and has a second dispersing hole communicating with the second receiving cavity. The first receiving cavity and the second receiving cavity are in communication.

2. The plastic part according to claim 1, characterized in that, The main body includes a first fitting plane, the first support includes a second fitting plane, the first fitting plane is flush with the second fitting plane, and the first direction is perpendicular to the first fitting plane.

3. The plastic part according to claim 2, characterized in that, The second receiving cavity has a dimension of 1.5mm-2.3mm in the first direction.

4. The plastic part according to claim 3, characterized in that, The portion of the first support portion that protrudes relative to the main body portion has a dimension of 3.3mm-4.1mm in the first direction.

5. The plastic part according to claim 2, characterized in that, The plastic part includes an abutment member, which is connected to the cavity wall of the second receiving cavity, and the end of the abutment member in the first direction is flush with the first mating plane.

6. The plastic part according to claim 5, characterized in that, The abutting member includes a first abutting part and a second abutting part, the first abutting part and the second abutting part are connected, and the extending direction of the first abutting part intersects the extending direction of the second abutting part.

7. The plastic part according to claim 2, characterized in that, The plastic part further includes a second support portion, which is connected to one end of the main body opposite to the first support portion, and a portion of the second support portion protrudes relative to the main body along the first direction.

8. The plastic part according to claim 7, characterized in that, The second support portion encloses a connecting cavity, and the second support portion has a drain hole, which communicates with the connecting cavity.

9. A cover plate assembly, characterized in that, The cover plate assembly includes a cover plate body, an injection hole, and a plastic part according to any one of claims 1-8. The injection hole is disposed on the cover plate body, the cover plate body is fitted with the plastic part, and the injection hole faces the first receiving cavity.

10. A battery cell, characterized in that, The battery cell includes an electrode assembly and a cover plate assembly as described in claim 9, wherein the first support portion abuts against the electrode assembly, and the main body portion is arranged at intervals from the electrode assembly.

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