Battery cell, battery module and battery pack
By setting insulating glue and barrier layer on the connection surface of the electrode ear, the problems of tearing and short circuit after welding of the electrode ear are solved, and the safety and reliability of the battery cell are improved.
Patent Information
- Application Number
- CN202422281408.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-18
AI Technical Summary
In the prior art, the pole ears of the bare cell are prone to tear due to tape stress after welding, and the welding slag may cause the battery cell to be short-circuited, affecting battery safety.
The insulating glue and an insulation layer are provided on the connection surface of the electrode ear. The insulation glue blocks the welding slag, and the barrier layer blocks the pulling force of the insulation glue to avoid tearing and short circuit of the electrode ear.
Improve the safety of the battery cell, reduce the risk of welding slag leakage, enhance the reliability of the electrode welding, avoid the electrode tear, and improve the overall safety performance of the battery pack.
Smart Images
Figure CN223141000U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and particularly relates to a battery cell, a battery module and a battery pack having the battery cell. Background Art
[0002] With the development of new energy vehicles, the demand for fast charging of batteries is increasing, and the demand for fast charging of battery cells is also increasing. In related technologies, a bare battery cell is connected to a top cover through a connecting piece, the tab of the bare battery cell is ultrasonically welded to the connecting piece, and then connected to a pole through the connecting piece.
[0003] In related technologies, after the tab and the connecting piece are laser welded, glue needs to be pasted on the welding surface. After pasting the glue, the outermost layer of the tab is connected to the glue pasting surface. In the subsequent process of assembling the battery cells, during the bending process of the tab, due to the stress of the tape, the outermost tab adhered to the tape is prone to tearing. Summary of the Utility Model
[0004] The utility model aims to solve at least one of the technical problems in the related technologies to some extent. For this reason, an embodiment of the utility model provides a battery cell. The battery cell has the advantages of avoiding the risks of short circuit and tab tearing.
[0005] An embodiment of the utility model also provides a battery module.
[0006] An embodiment of the utility model also provides a battery pack.
[0007] The battery cell of the embodiment of the utility model includes a battery end cover, a bare battery cell, an insulating glue and a barrier layer.
[0008] The battery end cover includes an end cover body and a pole, and the pole penetrates through the end cover body; the bare battery cell includes a battery cell core body and a tab connected to each other, and an outer wall surface of a part of the tab extending out of the battery cell core body forms a connection surface, the connection surface has a connection area and a welding area connected in sequence, and the welding area is welded to the pole; the barrier layer is at least covered on the connection area to avoid adhesion between the connection area of the tab and the insulating glue.
[0009] For the battery cell of the embodiment of the utility model, through the insulating glue provided on the connection surface, not only can the tab be fixed to a certain extent, but also the insulating glue can block the welding slag around the connection surface, reducing the risk of welding slag sputtering and lapping between the tab and the battery cell core body, that is, reducing the problem of internal short circuit of the battery cell caused by welding slag leakage, thereby improving the safety of the battery cell.
[0010] In addition, in the region where the tab is connected to the cell core body, the stress is relatively concentrated, and when subjected to impact, the problem of force-induced tearing is likely to occur. By means of the barrier layer between the insulating adhesive and the tab, the problem of cracking caused by the insulating adhesive pulling on the connection area can be avoided.
[0011] Therefore, the cell of the embodiment of the present utility model has the advantages of avoiding the risks of short circuit and tab tearing.
[0012] In some embodiments, the connection area is a concave bending surface.
[0013] In some embodiments, the barrier layer covers a part of and the welding area.
[0014] In some embodiments, the insulating adhesive includes an insulating layer and an adhesive coating applied on the insulating layer; the barrier layer is attached to the adhesive coating, and at least a part of the barrier layer corresponds to the connection area, and the edge of the adhesive coating is adhered to the cell core body and the end cover body.
[0015] In some embodiments, the barrier layer covers the connection surface of the tab, and the barrier layer at least corresponds to the connection area of the connection surface, and the adhesive coating covers the barrier layer, and the outer edge of the adhesive coating is adhered to the cell core body and the end cover body.
[0016] In some embodiments, the barrier layer is electrostatically attracted or adhered to the connection surface of the tab.
[0017] In some embodiments, the barrier layer is a PET layer covering the connection surface of the tab.
[0018] In some embodiments, the width of the barrier layer is greater than the width L1 of the tab for complete coverage.
[0019] In some embodiments, the length of the barrier layer is greater than or equal to the sum of the length L2 of the welding area and the lengths L3 and L4 of the connection area.
[0020] In some embodiments, the tab includes multiple layers of single-piece tabs, and the multiple layers of single-piece tabs are arranged in a gathered and stacked manner, and the connection surface is formed on the outermost single-piece tab.
[0021] The cell of the embodiment of the present utility model further includes a cell housing having an opening, the end cover body seals the opening, and the bare cell is disposed inside the cell housing.
[0022] The battery module of the embodiment of the present utility model includes a plurality of cells according to any one of the above.
[0023] The battery pack according to an embodiment of the present utility model includes a battery box and the battery module described above, and the battery module is disposed within the battery box. Description of the Drawings
[0024] Figure 1 It is a partial view of the battery cell according to an embodiment of the present utility model.
[0025] Figure 2 is Figure 1 The enlarged view at A in
[0026] Figure 3 It is a partial view of the battery module according to an embodiment of the present utility model.
[0027] Figure 4 It is a schematic diagram of the cooperation of the tab, the insulating glue and the barrier layer according to an embodiment of the present utility model.
[0028] Reference Signs:
[0029] Battery end cover 1;
[0030] Naked battery cell 2; battery cell core 21; tab 22; connection area 221; welding area 222;
[0031] Insulating glue 3;
[0032] Barrier layer 4. Detailed Embodiment
[0033] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.
[0034] Below, reference is made to Figures 1-4 to describe the battery cell, the battery module and the battery pack according to the embodiments of the present utility model.
[0035] The battery cell according to an embodiment of the present utility model includes a battery end cover 1, a naked battery cell 2, an insulating glue 3 and a barrier layer 4.
[0036] The battery end cover 1 includes a cover body and a pole column, and the pole column penetrates through the cover body; the naked battery cell 2 includes a connected battery cell core 21 and a tab 22. The outer wall surface of the part of the tab 22 extending out of the battery cell core 21 forms a connection surface, and the connection surface has a sequentially connected connection area 221 and a welding area 222, and the welding area 222 is welded to the pole column; the barrier layer 4 is at least covered on the connection area 221 to prevent the connection area 221 of the tab 22 from adhering to the insulating glue 3.
[0037] The battery cell of the embodiment of the present utility model, through the insulating glue 3 provided on the connection surface, can not only play a certain fixing role for the tab 22, but also the insulating glue 3 can block the welding slag around the connection surface, reducing the risk of welding slag splashing and lapping between the tab 22 and the battery cell core 21, that is, reducing the problem of internal short circuit of the battery cell caused by the leakage of welding slag, thereby improving the safety of the battery cell.
[0038] In addition, in the area where the tab 22 is connected to the battery cell core 21, the stress is relatively concentrated, and when subjected to impact, the problem of force tearing is likely to occur. Through the barrier layer 4 between the insulating glue 3 and the tab 22, the problem of cracking caused by the connection area 221 no longer being pulled by the insulating glue 3 can be avoided.
[0039] Therefore, the battery cell of the embodiment of the present utility model has the advantages of avoiding the risks of short circuit and tearing of the tab 22.
[0040] Such as Figure 1 and Figure 3 shown, the connection area 221 is an inwardly concave bent surface.
[0041] The battery cell of the embodiment of the present utility model, by making the connection area 221 an inwardly concave bent surface, is beneficial to the gathering of the tab 22, thereby improving the welding reliability of the tab 22. Moreover, the bent tab 22 can be supported and fixed, and during the vibration impact process, it can avoid the tab 22 being bent by force and lapping with the main body part, reducing the risk of internal short circuit of the electrode assembly.
[0042] Optionally, the battery cell of the embodiment of the present utility model can also be provided with a spacer between the end cap body and the battery cell core 21, and the spacer can separate the welding area 222 of the pole column and the tab 22. The provided spacer can avoid the problem of being punctured and causing short circuit during the process of welding the pole column and the tab 22. Thus, the battery cell of the embodiment of the present utility model has the advantage of good safety performance.
[0043] The barrier layer 4 covers a part of the welding area 222 and the connection area 221.
[0044] A part of the welding area 222 is relatively weak due to the welding mark, and when subjected to impact, the problem of force tearing is likely to occur. Through the barrier layer 4 between the insulating glue 3 and the tab 22, the problem of cracking caused by the connection area 221 no longer being pulled by the insulating glue 3 can be further avoided.
[0045] The insulating glue 3 includes an insulating layer and a coating layer coated on the insulating layer. The barrier layer 4 is attached to the coating layer, and at least a part of the barrier layer 4 corresponds to the connection area 221, and the edge of the coating layer is adhered to the tab 22. It can be understood that the barrier layer 4 is first attached to the coating layer, and then the insulating glue 3 is attached to the barrier layer 4.
[0046] For the battery cell of the embodiment of the present utility model, the insulating adhesive 3 is divided into an insulating layer and an adhesive coating layer coated on the insulating layer, and the barrier layer 4 is first attached to the adhesive coating layer. The battery cell of the embodiment of the present utility model has the advantage of high processing convenience.
[0047] Specifically, during the preparation of the tape, after normal glue coating, an additional layer of PET is covered in the middle position, and the position where the additional PET is covered is attached to the bent surface of the tab 22 during tape pasting.
[0048] The embodiment of the present utility model is not limited thereto. For example, in other embodiments, the insulating adhesive 3 includes an insulating layer and an adhesive coating layer coated on the insulating layer. The barrier layer 4 covers the connection surface of the tab 22, and the barrier layer 4 corresponds at least to the connection area 221 of the connection surface, and the adhesive coating layer covers the barrier layer 4. It can be understood that the barrier layer 4 is first attached to the tab 22, and then the insulating adhesive 3 is attached to the connection surface of the tab 22 where the barrier layer 4 has been provided.
[0049] For the battery cell of the embodiment of the present utility model, the barrier layer 4 is first attached to the tab 22, without changing the structure of the insulating adhesive 3. Only the barrier layer 4 needs to be attached to the tab 22 in advance. Compared with changing the structure of the insulating adhesive 3, this method does not need to modify the existing tape pasting mechanism and has relatively low cost.
[0050] Optionally, the insulating layer can be made of materials such as terephthalic acid plastics (PET), polypropylene (pp), etc., and the adhesive coating layer can be made of materials such as a pressure-sensitive adhesive layer, a UV adhesive layer, etc. The substrate has a bearing surface for bearing the adhesive layer, and the adhesive layer is coated on the bearing surface.
[0051] The width of the barrier layer 4 is greater than the width of the tab 22 for complete coverage. To ensure that while covering the bent surface area of the tab 22, it does not prevent the tape from protecting the welding area.
[0052] The length of the barrier layer 4 is greater than or equal to the sum of the length L2 of the welding area 222 and the lengths L3 and L4 of the connection area 221. To ensure that while covering the bent surface area of the tab 22, it does not prevent the tape from protecting the welding area 222.
[0053] The tab 22 includes multiple single-layer tabs 22, and the multiple single-layer tabs 22 are gathered and arranged in a stacked manner, and the connection surface is formed on the outermost single-layer tab 22.
[0054] The battery module of the present utility model may include multiple battery cells according to any one of the above.
[0055] The battery module of the embodiment of the present utility model has the advantages of avoiding the risks of short circuit and tearing of the tab 22.
[0056] The battery pack of the present utility model may include a battery box and a battery module according to the above, and the battery module is disposed within the battery box.
[0057] The battery pack according to an embodiment of the present utility model has the advantages of avoiding the risks of short circuit and tearing of the tab 22.
[0058] In the battery pack, there may be multiple battery cells formed by single cells, and the multiple battery cells may be connected in series, in parallel or in a hybrid connection. The whole formed by the multiple battery cells is accommodated within the battery box.
[0059] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model.
[0060] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.
[0061] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0062] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0063] In the present utility model, the terms "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.
[0064] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.
Claims
1. A battery cell, characterized in that, Comprising: A battery end cap, the battery end cap including an end cap body and a pole post, the pole post being disposed through the end cap body; And A bare battery cell, the bare battery cell including a battery cell core body and a tab connected thereto, an outer wall surface of a portion of the tab extending out of the battery cell core body forming a connection surface, the connection surface having a connection area and a welding area connected in sequence, the welding area being welded to the pole post; An insulating adhesive and a barrier layer, the barrier layer being at least disposed on the connection area so as to prevent adhesion between the connection area of the tab and the insulating adhesive.
2. The battery cell according to claim 1, characterized in that The connection area is a concave bent surface.
3. The battery cell according to claim 1, wherein The barrier layer covers a portion of the welding area and the connection area.
4. The battery cell according to claim 1, wherein The insulating adhesive includes an insulating layer and an adhesive layer coated on the insulating layer; The barrier layer is adhered to the adhesive layer, and at least a portion of the barrier layer corresponds to the connection area, and an edge of the adhesive layer is adhered to the battery cell core body and the end cap body; Or, the barrier layer covers the connection surface of the tab, and the barrier layer at least corresponds to the connection area of the connection surface, and the adhesive layer covers the barrier layer, and an outer edge of the adhesive layer is adhered to the battery cell core body and the end cap body.
5. The cell according to claim 4, characterized in that, The barrier layer is electrostatically attracted or adhered to the connection surface of the tab.
6. The battery cell according to claim 1, wherein, The barrier layer is a PET layer covering the connection surface of the tab.
7. The cell according to claim 1, wherein The width of the barrier layer is greater than the width L1 of the tab; and / or, the length of the barrier layer is greater than or equal to the sum of the length L2 of the welding area and the lengths L3 and L4 of the connection area.
8. The battery cell according to any one of claims 1-7, characterized in that, The tab includes a plurality of single-layer tabs, the plurality of single-layer tabs being gathered and arranged in a stacked manner, the connection surface being formed on the outermost single-layer tab; And / or, further including a battery cell housing having an opening, the end cap body sealing the opening, and the bare battery cell being disposed inside the battery cell housing.
9. A battery module, characterized in that, Including a plurality of battery cells according to any one of claims 1-8.
10. A battery pack, characterized in that, Including a battery box and a battery module according to claim 9, the battery module being disposed inside the battery box.