Connecting structure of insulating film and lower plastic part, battery cell and battery pack

Abstract

The utility model provides a connecting structure of an insulating film and a lower plastic part, a battery cell and a battery pack. The connecting structure of the insulating film and the lower plastic part comprises a clamping part arranged on the insulating film and a clamping matching part arranged on the lower plastic part, the insulating film is provided with a main body coating sheet and a side coating sheet which are connected, the main body coating sheet coats one side, facing the battery cell, of the lower plastic part, and the side coating sheet coats the circumferential direction of the lower plastic part, between the main body coating sheet and the lower plastic part and / or between the main body coating sheet and the lower plastic part; and the side wrapping sheet and the lower plastic part are connected together through the clamping matching of the clamping part and the clamping matching part. According to the connecting structure of the insulating film and the lower plastic part, by changing the connecting mode of the insulating film and the lower plastic part, defective products caused by the wiredrawing phenomenon due to hot melting connection can be avoided, and the connecting structure has a good using effect.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cell manufacturing, and in particular to a connection structure between an insulating film and a lower plastic part. The utility model also relates to a battery cell provided with the connection structure between the insulating film and the lower plastic part, and a battery pack provided with the battery cell. Background Art

[0002] As the power source of new energy vehicles, lithium battery technology has developed rapidly in recent years. Square lithium battery is the most common lithium-ion battery structure. In the manufacturing process of lithium batteries, it is usually necessary to use an insulating film such as Mylar film to weld the lower plastic part together by hot melt. However, when the Mylar film is hot-melted with the lower plastic part, wire drawing is prone to occur, affecting the yield. If it is accidentally transferred to the subsequent process, it will cause the diaphragm to be punctured, causing risks such as short circuits. Utility Model Content

[0003] In view of this, the utility model aims to provide a connection structure between an insulating film and a lower plastic part, so as to avoid the occurrence of defective products caused by wire drawing due to hot-melt connection.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A connection structure between an insulating film and a lower plastic part, comprising a clamping part arranged on the insulating film, and a clamping matching part arranged on the lower plastic part;

[0006] The insulating film has a main covering sheet and a side covering sheet connected to each other, wherein the main covering sheet covers the side of the lower plastic part facing the battery core, and the side covering sheet covers the circumference of the lower plastic part. The main covering sheet and the lower plastic part, and / or the side covering sheet and the lower plastic part are connected together by the snap-fitting of the snap-fitting part and the snap-fitting part.

[0007] Furthermore, the snap-fitting portion includes a snap-fitting portion integrally formed on the insulating film; the snap-fitting portion includes a snap-fitting groove provided on the lower plastic part, and the snap-fitting portion can be snapped into the snap-fitting groove.

[0008] Furthermore, the buckle has a conical clamping body, and a deformation gap is provided on the clamping body; the clamping slot includes a connected through hole and a clamping hole, and the clamping body passes through the through hole and is clamped in the clamping hole.

[0009] Furthermore, the clamping portion includes a clamping hole formed on the insulating film; the clamping matching portion includes a clamping protrusion provided on the lower plastic part, and the clamping protrusion can be clamped in the clamping hole.

[0010] Further, the snap-in parts are multiple and arranged at intervals on the circumferential direction of the main body covering sheet, the snap-fitting parts are multiple and arranged on the side of the lower plastic part facing the battery core, and the multiple snap-in parts are snap-fitted with the multiple snap-fitting parts in a one-to-one correspondence; and / or, the snap-in parts are multiple and arranged at intervals on each of the side covering sheets, the snap-fitting parts are multiple and arranged on the circumferential direction of the lower plastic part, and the multiple snap-in parts are snap-fitted with the multiple snap-fitting parts in a one-to-one correspondence.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] The connection structure between the insulating film and the lower plastic part described in the utility model adopts the snap-fitting of the snap-fitting part and the snap-fitting part so that the insulating film is snap-connected to the lower plastic part, thereby changing the connection mode between the insulating film and the lower plastic part, thereby avoiding the occurrence of defective products caused by wire drawing due to hot-melt connection of the insulating film, thereby facilitating improving the yield rate and having a good use effect.

[0013] In addition, the snap-fit ​​part adopts a snap buckle, and the snap-fitting part adopts a slot, which has a simple structure and is easy to process and prepare. The deformation gap provided on the snap-fit ​​main body on the snap buckle enables the snap-fit ​​main body to be compressed and deformed when passing through the through hole, and when extending from the through hole to the snap-fitting hole, it can be well snapped in the snap-fitting hole by utilizing deformation reset.

[0014] Secondly, the clamping part is formed in the clamping hole, and the clamping matching part is a clamping protrusion set on the lower plastic part. Through the clamping matching of the clamping protrusion and the clamping hole, the insulating film and the lower plastic part can also be clamped and connected, and a better connection effect can be guaranteed. The clamping parts are arranged on the main body covering sheet at intervals, and the clamping matching parts are arranged on one side of the lower plastic part, and the multiple clamping parts and the multiple clamping matching parts are arranged one by one, which is conducive to improving the connection effect between the main body covering sheet on the insulating film and the lower plastic part.

[0015] In addition, there are a plurality of snap-fitting portions arranged at intervals on the side covering sheet, and a plurality of snap-fitting portions are arranged on the circumference of the lower plastic part, and the plurality of snap-fitting portions are arranged in one-to-one correspondence with the plurality of snap-fitting portions, which is beneficial to improving the connection effect between the side covering sheet on the insulating film and the lower plastic part, and the plurality of snap-fitting portions on the main covering sheet and the plurality of snap-fitting portions on the side covering sheet respectively cooperate with the corresponding snap-fitting portions, which can further improve the connection effect between the insulating film and the lower plastic part.

[0016] Another object of the utility model is to provide a battery core, in which the connection structure between the insulating film and the lower plastic part as described above is provided.

[0017] In addition, the utility model also proposes a battery pack, in which the battery cell as described above is arranged.

[0018] The battery cell and battery pack of the present invention, as well as the connection structure between the insulating film and the lower plastic part as described above, have the same beneficial effects as those of the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention 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 improper limitation on the present invention. In the accompanying drawings:

[0020] Figure 1 It is a cross-sectional view of the connection structure between the insulating film and the lower plastic part according to the embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the buckle described in the embodiment of the utility model;

[0022] Description of reference numerals:

[0023] 1. Insulating film; 11. Buckle; 111. Connecting column; 112. Snap-fitting body; 10. Deformation gap;

[0024] 2. Lower plastic part; 21. Card slot; 211. Through hole; 212. Card hole. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] Embodiment 1

[0030] The present embodiment relates to a connection structure between an insulating film and a lower plastic part, which can avoid the occurrence of defective products caused by wire drawing due to hot-melt connection, and is conducive to improving the yield rate of the product.

[0031] In terms of overall structure, see Figure 1 and Figure 2 The connection structure between the insulating film and the lower plastic part of this embodiment includes a snap-fit ​​portion provided on the insulating film 1, and a snap-fit ​​portion provided on the lower plastic part 2. The insulating film 1 has a main covering sheet and a side covering sheet connected to each other. The main covering sheet covers the side of the lower plastic part facing the battery cell, and the side covering sheet covers the circumference of the lower plastic part. The main covering sheet and the lower plastic part 2, and / or the side covering sheet and the lower plastic part 2 are connected together by snap-fitting of the snap-fit ​​portion and the snap-fit ​​portion.

[0032] It should be noted that the snap-fitting portion and the snap-fitting portion can be arranged only between the main body covering sheet and the lower plastic part 2, that is, only the main body covering sheet and the lower plastic part 2 are snap-fitted together by the snap-fitting portion and the snap-fitting portion. The snap-fitting portion and the snap-fitting portion can also be arranged only between the side covering sheet and the circumference of the lower plastic part 2, that is, only the side covering sheet and the circumference of the lower plastic part 2 are snap-fitted together by the snap-fitting portion and the snap-fitting portion. Of course, the snap-fitting portion and the snap-fitting portion can also be arranged between the main body covering sheet and the lower plastic part 2 and between the side covering sheet and the lower plastic part 2.

[0033] In addition, it should be noted that the lower plastic part of this embodiment is in the shape of an elongated strip as a whole, and has a first end face facing the battery cell in the battery cell housing and a second end face away from the side where the battery cell is located, and four side faces connected between the first end face and the second end face. In this embodiment, the snap-fitting part is arranged on the side of the lower plastic part away from the cover plate and the circumference of the lower plastic part, that is, it is arranged on the first end face and the four side faces. In addition, the insulating film of this embodiment is preferably a Mylar film. Of course, it can be understood that it can also use other diaphragms with insulating functions in the prior art, which is also possible.

[0034] For more details, see Figure 1 and Figure 2 As shown, in this embodiment, the snap-fitting portion includes a snap-fitting portion 11 integrally formed on the insulating film 1, and the snap-fitting portion includes a snap-fitting slot 21 provided on the lower plastic part 2, and the snap-fitting portion 11 can be snapped into the snap-fitting slot 21. At this time, the snap-fitting portion 11 and the snap-fitting slot 21 are matched, and the structure is simple and easy to process and prepare.

[0035] As a preferred embodiment, still refer to Figure 1and Figure 2 As shown, the buckle 11 of this embodiment has a connecting column 111 connected to the insulating film 1, and a tapered clamping body 112 connected to the end of the connecting column 111, and a deformation gap 10 is provided on the clamping body 112. The clamping slot 21 specifically includes a through hole 211 and a clamping hole 212 that are connected to each other, and the clamping body 112 passes through the through hole 211 and is clamped in the clamping hole 212. The deformation gap 10 provided on the clamping body 112 allows the clamping body 112 to be compressed and deformed when passing through the through hole 211, and when extending from the through hole 211 to the clamping hole 212, the clamping body 112 can be better clamped in the clamping hole 212 by utilizing the deformation reset of the clamping body 112.

[0036] In addition, as another preferred embodiment, the clamping portion of this embodiment includes a clamping hole formed on the insulating film 1, and the clamping matching portion includes a clamping protrusion provided on the lower plastic part 2, and the clamping protrusion can be clamped in the clamping groove 21. At this time, the insulating film 1 and the lower plastic part 2 can also be clamped and connected by the clamping matching of the clamping protrusion and the clamping hole.

[0037] In the present embodiment, as a further preferred implementation mode, a plurality of snap-fitting portions are arranged at intervals in the circumferential direction of the main covering sheet, and a plurality of snap-fitting portions are also arranged at intervals on each side covering sheet. Correspondingly, a plurality of snap-fitting portions are also provided on the side of the lower plastic part 2 facing the battery core and in the circumferential direction of the lower plastic part 2, that is, on the second end face and four side surfaces of the lower plastic part 2. The plurality of snap-fitting portions are snap-fitted with the plurality of snap-fitting portions one by one, so that the main covering sheet and the side covering sheet on the insulating film 1 are snap-fitted and connected with the corresponding positions of the lower plastic part 2, which can further improve the connection effect between the insulating film 1 and the lower plastic part 2.

[0038] In specific implementation, that is, multiple buckles 11 are arranged at intervals on the main covering sheet and the side covering sheet, and correspondingly, multiple slots 21 are also arranged at intervals on one side of the lower plastic part 2 and in the circumferential direction of the lower plastic part 2. The buckles 11 are connected with the slots 21 one by one, so that the insulating film 1 is better covered on the lower plastic part 2.

[0039] It is worth mentioning that the snap-in parts can be multiple and spaced only on the main covering sheet. In this case, the snap-in fitting parts are multiple and spaced only on one side of the lower plastic part 2. Multiple snap-in parts are snapped with multiple snap-in fitting parts in a one-to-one correspondence, which can help improve the connection effect between the main covering sheet on the insulating film 1 and the lower plastic part 2. It is understandable that the snap-in parts can also be multiple and spaced only on the side covering sheet. The snap-in fitting parts are multiple and spaced only on the circumferential direction of the lower plastic part 2. Multiple snap-in parts are snapped with multiple snap-in fitting parts in a one-to-one correspondence, which can help improve the connection effect between the side covering sheet on the insulating film 1 and the lower plastic part 2.

[0040] In addition, it is worth noting that by forming the buckle 11 on the insulating film 1 and making the buckle 11 engage with the engagement groove 21 on the lower plastic part 2, it has been verified that the engagement between the buckle 11 and the engagement groove 21 meets the use requirements. Moreover, by punching holes in the existing insulating film 1 and passing a rope through the hole for a tensile test, it has been verified that the engagement between the insulating film 1 and the lower plastic part 2 using the engagement protrusion and the engagement hole can also meet the use requirements.

[0041] The connection structure between the insulating film and the lower plastic part of the present embodiment changes the connection method between the insulating film 1 and the lower plastic part 2 so that the insulating film 1 and the lower plastic part 2 are snap-connected, thereby avoiding the occurrence of defective products caused by wire drawing due to the hot-melt connection of the insulating film 1, thereby helping to improve the yield rate and having a good use effect.

[0042] Embodiment 2

[0043] The present embodiment relates to a battery cell, in which the connection structure between the insulating film and the lower plastic part described in the first embodiment is provided.

[0044] At the same time, this embodiment also relates to a battery pack, in which the above-mentioned battery cell is arranged.

[0045] The battery cell and battery pack of this embodiment, by adopting the connection structure of the insulating film and the lower plastic part of the first embodiment, can avoid the occurrence of defective products caused by wire drawing due to the hot-melt connection of the insulating film 1, thereby helping to improve the yield rate and the product quality of the battery cell and battery pack.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection structure between an insulating film and a lower plastic part, characterized in that: It includes a snap-fitting portion arranged on an insulating film and a snap-fitting portion arranged on a lower plastic part; the insulating film has a main covering sheet and a side covering sheet connected to each other, the main covering sheet covers the side of the lower plastic part facing the battery core, the side covering sheet covers the circumference of the lower plastic part, the main covering sheet and the lower plastic part, and / or the side covering sheet and the lower plastic part are connected together by snap-fitting of the snap-fitting portion and the snap-fitting portion.

2. The connection structure between the insulating film and the lower plastic part according to claim 1, characterized in that: The clamping portion includes a buckle integrally formed on the insulating film; The snap-fitting portion comprises a slot provided on the lower plastic part, and the buckle can be snapped into the slot.

3. The connection structure of the insulating film and the lower plastic part according to claim 2, characterized in that: The buckle has a conical clamping body, and a deformation gap is provided on the clamping body; The clamping slot comprises a through hole and a clamping hole which are connected to each other, and the clamping body passes through the through hole and is clamped in the clamping hole.

4. The connection structure of the insulating film and the lower plastic part according to claim 1, characterized in that: The clamping portion includes a clamping hole formed on the insulating film; The snap-fitting portion comprises a snap-fitting protrusion provided on the lower plastic part, and the snap-fitting protrusion can be snapped in the snap-fitting hole.

5. The connection structure between the insulating film and the lower plastic part according to any one of claims 1 to 4, characterized in that: The clamping parts are arranged in a plurality of intervals on the circumference of the main body covering sheet, the clamping fitting parts are arranged in a plurality of intervals on the side of the lower plastic part facing the battery core, and the plurality of clamping parts are clamped in a one-to-one correspondence with the plurality of clamping fitting parts; and / or, The clamping parts are multiple and arranged at intervals on each of the side covering sheets, and the clamping matching parts are multiple and arranged on the circumference of the lower plastic part. The multiple clamping parts are clamped with the multiple clamping matching parts in a one-to-one correspondence.

6. A battery cell, characterized in that: The battery cell is provided with a connection structure between the insulating film and the lower plastic part according to any one of claims 1 to 5.

7. A battery pack, characterized in that: The battery pack is provided with the battery cell described in claim 6.

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