Battery structure

Abstract

The utility model provides a battery structure. The battery structure comprises an electrode assembly, a plastic part, an insulating layer and a connecting piece, wherein the electrode assembly is provided with a tab; the connecting piece is provided with a tab connecting area, and the tab connecting area is used for being connected with a tab; the plastic part is located on the side, facing the electrode assembly, of the connecting part, and the insulating layer is clamped between the plastic part and the connecting part. The utility model solves the problem that the service life of the secondary battery is seriously shortened as the insulation reliability inside the secondary battery cannot be ensured due to the risk that the insulation glue layer below the connecting piece of the secondary battery in the prior art falls off after being soaked in electrolyte.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and more specifically, to a battery structure. Background Technology

[0002] Secondary batteries are widely used in electrical equipment in various fields due to their good storage and rate characteristics. In particular, the use of secondary batteries under extreme conditions requires ensuring that all performance characteristics of the secondary batteries meet the standards.

[0003] In existing technology, a secondary battery includes a casing, electrode assembly, connectors, and a cover plate. The electrode assembly is housed within the space enclosed by the cover plate and the casing, and the connectors are used to connect the tabs of the electrode assembly to the terminals on the cover plate. Typically, to ensure insulation between the connectors and the electrode assembly, an insulating adhesive layer is applied to the lower surface of the connector (the surface facing the electrode assembly). However, after prolonged immersion in electrolyte, the insulating adhesive layer risks detaching, compromising the internal insulation reliability of the battery and significantly shortening its lifespan. Utility Model Content

[0004] The main objective of this invention is to provide a battery structure that addresses the problem in existing secondary batteries where the insulating adhesive layer under the connector is at risk of detaching after being soaked in electrolyte, thus failing to ensure the internal insulation reliability of the secondary battery and severely shortening its lifespan.

[0005] To achieve the above objectives, this utility model provides a battery structure, including an electrode assembly, a plastic part, an insulating layer, and a connector; wherein, the electrode assembly has tabs; the connector has a tab connection area for connecting with the tabs; the plastic part is located on the side of the connector facing the electrode assembly, and the insulating layer is sandwiched between the plastic part and the connector.

[0006] In one exemplary embodiment, the melting point of the insulating layer is higher than that of the plastic part.

[0007] In one exemplary embodiment, the insulating layer is a PI adhesive layer or a ceramic layer.

[0008] In one exemplary embodiment, the insulating layer is applied to the lower surface of the connector by spraying or scraping, wherein the lower surface of the connector is the surface of the connector facing the plastic part.

[0009] In one exemplary embodiment, the insulating layer is bonded to the plastic part by structural adhesive.

[0010] In one exemplary embodiment, the thickness of the insulating layer ranges from 50 to 150 μm.

[0011] In an exemplary embodiment, the electrode tab includes a negative electrode tab and a positive electrode tab; the connector includes a negative electrode connector and a positive electrode connector, and both the negative electrode connector and the positive electrode connector are disposed at the electrode tab connection area, with the negative electrode connector correspondingly connected to the negative electrode tab and the positive electrode connector correspondingly connected to the positive electrode tab; the insulating layer includes a negative electrode insulating layer corresponding to the negative electrode connector, and the insulating layer also includes a positive electrode insulating layer corresponding to the positive electrode connector; wherein, the sum of the thicknesses of the negative electrode connector and the negative electrode insulating layer is equal to the sum of the thicknesses of the positive electrode connector and the positive electrode insulating layer.

[0012] In an exemplary embodiment, the insulating layer has a first projection in a first direction, and the connector has a second projection in the first direction, the first projection completely covering the second projection; wherein, the first direction is the thickness direction of the insulating layer.

[0013] In one exemplary embodiment, a portion of the surface of the plastic part facing away from the electrode assembly is recessed to form a receiving groove, an insulating layer is located within the receiving groove, and at least a portion of the connector is located within the receiving groove.

[0014] In one exemplary embodiment, the depth of the receiving groove is less than the thickness of the connector.

[0015] The present invention provides a battery structure comprising an electrode assembly, a plastic component, an insulating layer, and a connector; wherein the electrode assembly has tabs; the connector has a tab connection area for connecting with the tabs; the plastic component is located on the side of the connector facing the electrode assembly, and the insulating layer is sandwiched between the plastic component and the connector.

[0016] By sandwiching the insulating layer between the plastic parts and the connectors, the installation stability of the insulating layer is ensured, which helps to prevent the insulating layer from falling off under long-term immersion in the electrolyte, thereby ensuring the insulation performance of the battery structure under normal operating conditions. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A partial structural schematic diagram of a battery structure according to an optional embodiment of the present invention is shown;

[0019] Figure 2 It shows Figure 1 An exploded view of the battery structure in the diagram;

[0020] Figure 3A partial structural schematic diagram of a battery structure according to another alternative embodiment of the present invention is shown.

[0021] The above figures include the following reference numerals:

[0022] 10. Electrode assembly; 11. Tab;

[0023] 20. Plastic parts; 21. Receiving groove; 211. Guide protrusion; 22. Drain hole;

[0024] 30. Insulating layer; 31. First guide notch;

[0025] 40. Connector; 41. Terminal connection part; 42. Electrode connection area; 43. Second guide notch. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] To address the problem that the insulating adhesive layer under the connector of a secondary battery in the prior art is at risk of peeling off after being soaked in electrolyte, thus failing to ensure the internal insulation reliability of the secondary battery and severely shortening its service life, this utility model provides a battery structure.

[0028] Example 1

[0029] like Figure 1 and Figure 2 As shown, the battery structure includes an electrode assembly 10, a plastic part 20, an insulating layer 30, and a connector 40; wherein, the electrode assembly 10 has a tab 11; the connector 40 has a tab connection area 42 for connecting with the tab 11; the plastic part 20 is located on the side of the connector 40 facing the electrode assembly 10, and the insulating layer 30 is sandwiched between the plastic part 20 and the connector 40.

[0030] By sandwiching the insulating layer 30 between the plastic part 20 and the connector 40, the installation stability of the insulating layer 30 is ensured, which helps to prevent the insulating layer 30 from falling off under long-term immersion in the electrolyte, thereby ensuring the insulation performance of the battery structure under normal operating conditions.

[0031] In some embodiments, the melting point of the insulating layer 30 is higher than that of the plastic part 20.

[0032] Typically, the negative electrode of a battery has a relatively high temperature rise, which can easily lead to heat concentration. The plastic part 20 is usually made of PET material, but PET has poor high temperature resistance. When the negative electrode heats up, the insulation performance of the plastic part 20 is compromised, but the insulation layer 30 can still maintain its insulation performance.

[0033] In some embodiments, the insulating layer 30 is a PI adhesive layer or a ceramic layer; the plastic part 20 is made of PET material; wherein, the PI adhesive layer is polyimide (abbreviated as PI), and the PET material is polyethylene terephthalate (abbreviated as PET).

[0034] Furthermore, the insulating layer 30 is either a sprayed layer or a scraped layer. Thus, using a sprayed layer to form the insulating layer 30 ensures ease of installation, or using a scraped layer to form the insulating layer 30 also ensures ease of installation.

[0035] In some embodiments, the insulating layer 30 is applied to the lower surface of the connector 40 by spraying or scraping, wherein the lower surface of the connector 40 is the surface of the connector 40 facing the plastic part 20.

[0036] In some embodiments, the insulating layer 30 is connected to the plastic part 20 by structural adhesive.

[0037] In some embodiments, to ensure the insulation reliability of the insulating layer 30, the thickness of the insulating layer 30 is preferably in the range of 50-150 μm. This optimizes the thickness range of the insulating layer 30, preventing it from being too thin and failing to achieve effective insulation, while also avoiding an increase in the overall height of the battery structure due to an excessively thick insulating layer 30.

[0038] In some embodiments, the insulating layer 30 has a first projection in a first direction, and the connector 40 has a second projection in the same first direction, the first projection completely covering the second projection; wherein, the first direction is the thickness direction of the insulating layer 30. This ensures that the connector 40 can be fully supported on the insulating layer 30, thereby ensuring the insulation reliability of the insulating layer 30.

[0039] In some embodiments, the outer contour of the insulating layer 30 is located on the outer periphery of the outer contour of the connector 40.

[0040] In some embodiments, the distance between the outer contour of the insulating layer 30 and the outer contour of the connector 40 is in the range of 2 to 3 mm. This optimizes the range of the distance between the outer contours of the insulating layer 30 and the connector 40, preventing excessively small creepage gaps that could lead to insulation failure in the battery structure.

[0041] In some embodiments, the connector 40 further includes a terminal connection portion 41 for connecting to a terminal on the cover plate.

[0042] In some embodiments, the tab 11 is connected to the upper surface of the connector 40, which is the surface of the connector 40 facing away from the plastic part 20.

[0043] In some embodiments, the thickness of the insulating layer 30 ranges from 50 to 150 μm.

[0044] In some embodiments, the tab 11 includes a negative tab and a positive tab; the connector 40 includes a negative connector and a positive connector, and both the negative connector and the positive connector are disposed at the tab connection area 42, with the negative connector corresponding to the negative tab and the positive connector corresponding to the positive tab; the insulating layer 30 includes a negative insulating layer corresponding to the negative connector, and the insulating layer 30 also includes a positive insulating layer corresponding to the positive connector; wherein the sum of the thicknesses of the negative connector and the negative insulating layer is equal to the sum of the thicknesses of the positive connector and the positive insulating layer.

[0045] Typically, due to overcurrent requirements, the thickness of the negative electrode connector is thinner than that of the positive electrode connector. This thickness difference leads to slightly lower stability of the entire battery structure. In this application, the sum of the thicknesses of the negative electrode connector and the negative electrode insulating layer is set to be equal to the sum of the thicknesses of the positive electrode connector and the positive electrode insulating layer, thereby eliminating this thickness difference and improving the stability of the entire battery structure.

[0046] Example 2

[0047] It should be noted that the difference between this embodiment and Embodiment 1 is that, as shown in the following... Figure 3As shown, a portion of the surface of the plastic part 20 facing away from the electrode assembly 10 is recessed to form a receiving groove 21. The insulating layer 30 is located within the receiving groove 21, and at least a portion of the connector 40 is located within the receiving groove 21. Thus, by providing the receiving groove 21 on the side of the plastic part 20 facing away from the electrode assembly 10, ensuring that the insulating layer 30 and at least a portion of the connector 40 are located within the receiving groove 21, the reliability of the receiving groove 21 in limiting the insulating layer 30 is further ensured. It also provides reliable limiting for the connector 40, making the connector 40, insulating layer 30, and plastic part 20 form an integrated structure. Furthermore, the receiving groove 21 can further reduce the possibility of the insulating layer 30 coming into contact with the electrolyte, which helps prevent the insulating layer 30 from detaching due to long-term immersion in the electrolyte.

[0048] In some embodiments, the depth of the receiving groove 21 is less than the thickness of the connector 40. This ensures that at least a portion of the connector 40 is exposed outside the receiving groove 21 to facilitate connection of the connector 40 to the tab 11 and / or the terminals on the cover plate.

[0049] like Figure 3 As shown, at least one side of the accommodating groove 21 has a raised section facing the accommodating groove 21 to form a guide protrusion 211; the insulating layer 30 has a first guide notch 31 at a position opposite to the guide protrusion 211; and the connector 40 has a second guide notch 43 at a position opposite to the guide protrusion 211. Thus, the guide protrusion 211 and the first guide notch 31 guide the insulating layer 30 during installation, and the guide protrusion 211 and the second guide notch 43 guide the connector 40 during installation.

[0050] like Figure 3 As shown, the plastic part 20 also has a drainage hole 22.

[0051] In some embodiments, the receiving groove 21, the insulating layer 30 and the connector 40 are adapted to each other, that is, the outer contours of the three are consistent.

[0052] In some embodiments, the insulating layer 30 is applied to the lower surface of the connector 40 by spraying or scraping; then the side surface of the insulating layer 30 facing away from the connector 40 and the bottom of the receiving groove 21 are connected by structural adhesive.

[0053] The present invention provides a battery structure comprising an electrode assembly 10, a plastic part 20, an insulating layer 30, and a connector 40. The electrode assembly 10 has tabs 11. The connector 40 has a tab connection area 42 for connecting to the tabs 11. The plastic part 20 is located on the side of the connector 40 facing the electrode assembly 10, and the insulating layer 30 is sandwiched between the plastic part 20 and the connector 40.

[0054] By sandwiching the insulating layer 30 between the plastic part 20 and the connector 40, the installation stability of the insulating layer 30 is ensured, which helps to prevent the insulating layer 30 from falling off under long-term immersion in the electrolyte, thereby ensuring the insulation performance of the battery structure under normal operating conditions.

[0055] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0057] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0058] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0059] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0060] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery structure, characterized in that, include: Electrode assembly (10), plastic part (20), insulating layer (30) and connector (40); The electrode assembly (10) has tabs (11); The connector (40) has a tab connection area (42) for connecting with the tab (11); The plastic part (20) is located on the side of the connector (40) facing the electrode assembly (10), and the insulating layer (30) is sandwiched between the plastic part (20) and the connector (40).

2. The battery structure according to claim 1, characterized in that, The melting point of the insulating layer (30) is higher than that of the plastic part (20).

3. The battery structure according to claim 2, characterized in that, The insulating layer (30) is a PI adhesive layer or a ceramic layer.

4. The battery structure according to claim 3, characterized in that, The insulating layer (30) is applied to the lower surface of the connector (40) by spraying or scraping, wherein the lower surface of the connector (40) is the surface of the connector (40) facing the plastic part (20).

5. The battery structure according to claim 1, characterized in that, The insulating layer (30) is connected to the plastic part (20) by structural adhesive.

6. The battery structure according to claim 1, characterized in that, The thickness of the insulating layer (30) ranges from 50 to 150 μm.

7. The battery structure according to claim 1, characterized in that, The electrode tab (11) includes a negative electrode tab and a positive electrode tab; The connector (40) includes a negative electrode connector and a positive electrode connector, and both the negative electrode connector and the positive electrode connector are disposed at the tab connection area (42). The negative electrode connector is connected to the negative electrode tab, and the positive electrode connector is connected to the positive electrode tab. The insulating layer (30) includes a negative electrode insulating layer corresponding to the negative electrode connector, and the insulating layer (30) also includes a positive electrode insulating layer corresponding to the positive electrode connector; Wherein, the sum of the thicknesses of the negative electrode connector and the negative electrode insulating layer is equal to the sum of the thicknesses of the positive electrode connector and the positive electrode insulating layer.

8. The battery structure according to claim 1, characterized in that, The insulating layer (30) has a first projection in a first direction, and the connector (40) has a second projection in the first direction, wherein the first projection can completely cover the second projection; wherein, the first direction is the thickness direction of the insulating layer (30).

9. The battery structure according to any one of claims 1 to 8, characterized in that, The plastic part (20) has a recessed portion of its surface facing away from the electrode assembly (10) to form a receiving groove (21), the insulating layer (30) is located in the receiving groove (21), and at least a portion of the connector (40) is located in the receiving groove (21).

10. The battery structure according to claim 9, characterized in that, The depth of the receiving groove (21) is less than the thickness of the connector (40).

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