Battery cell and battery cell module with same
By incorporating grooves, insulating films, and explosion-proof sheet structures within the cell housing, the corrosion and poor pressure relief effects of the cell explosion-proof valve are resolved, resulting in a faster and more direct pressure relief response and reduced failure risk.
Patent Information
- Application Number
- CN202520216314.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-02-11
AI Technical Summary
Existing cell explosion-proof valves are susceptible to electrolyte corrosion and have poor pressure relief effects, especially with a high risk of failure when the impact force is insufficient.
A groove is provided on one side surface of the battery cell casing, which contains a pressure relief hole, an insulating film, and an explosion-proof sheet. The insulating film has perforated holes, which are covered by a hot melt adhesive film. The explosion-proof sheet has grooves, which are covered by a protective film to enhance the pressure relief effect.
By protecting the explosion-proof sheet with an insulating film, electrolyte corrosion is reduced, the pressure relief reaction is faster and more direct, the probability of explosion-proof sheet failure is reduced, and the safety of the battery cell is improved.
Smart Images
Figure CN223651504U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of battery cell, more specifically, a battery cell and a battery cell module with the same. BACKGROUND
[0002] Battery cells have energy storage characteristics and are widely used. For example, in electronic products such as mobile phones, tablet computers, cameras, and watches, battery cells are indispensable energy sources. In addition, in high-tech fields such as power tools, electric vehicles, hybrid electric vehicles, and unmanned aerial vehicles, battery cells also play a crucial role. Different types of battery cells have their unique advantages and application scenarios. Overall, battery cells are constantly driving the development of the electronic product and new energy vehicle industries due to their high energy density, long life, environmental friendliness, and rechargeable characteristics.
[0003] Currently, considering that the battery cell may be overcharged or subjected to a collision, which may cause an internal pressure of the battery cell to be too large and thus lead to an explosion, an explosion-proof valve is usually provided on the battery cell to avoid such a situation. However, the application of the explosion-proof valve still has the following problems: first, the explosion-proof valve in the prior art is mostly directly provided with an explosion-proof sheet at a pressure relief hole, and the explosion-proof sheet is difficult to avoid being corroded by the electrolyte inside the battery cell, thereby affecting the performance of the explosion-proof sheet, for example, causing the score of the explosion-proof sheet to break when the internal pressure of the battery cell does not reach a threshold value. Second, the explosion-proof sheet in the prior art usually only has one pressure relief area divided by a score, the impact surface is wide, and a large impact force is required. If the impact force for pressure relief is insufficient, the score is not easy to break in time, and there is a great risk of failure. Therefore, only one pressure relief score cannot bring good pressure relief effect. SUMMARY
[0004] The utility model provides a battery cell and a battery cell module with the same to solve the above-mentioned defects of the prior art.
[0005] The utility model adopts the technical scheme to solve the technical problems:
[0006] On the one hand, the utility model provides a battery cell, including the casing, the one side surface of casing is equipped with the recess, the recess is equipped with the pressure relief hole on the one side surface opposite with its slot, the recess is equipped with the insulating film covering the pressure relief hole, the insulating film is equipped with at least two hollow holes all with the pressure relief hole, the one side surface of insulating film away from the pressure relief hole is equipped with at least two hot melt adhesive films, and at least two hot melt adhesive films correspondingly cover at least two hollow holes, the recess is also equipped with an explosion-proof sheet, and the explosion-proof sheet is located on the side away from the insulating film of at least two hot melt adhesive films.
[0007] In some embodiments, there is a gap between any of the hot melt adhesive film and the explosion-proof sheet, and the gap is 1.0-2.0 mm.
[0008] In some embodiments, a protective film is attached to a side surface of the explosion-proof sheet away from the at least two hot melt adhesive films, and the protective film is provided with a second notch corresponding to the first notch.
[0009] In some embodiments, the protective film is flush with the groove opening.
[0010] In some embodiments, the depth of the first notch is 0.1-0.7 mm, and the depth of the second notch is 0.1-0.5 mm.
[0011] In some embodiments, the explosion-proof sheet is any one of an aluminum alloy explosion-proof sheet, a glass fiber explosion-proof sheet, and a ceramic explosion-proof sheet.
[0012] In some embodiments, the thickness of any of the hot melt adhesive films is less than the thickness of the insulating film.
[0013] In some embodiments, the shape of any of the hollow holes is a perfect circle or an ellipse.
[0014] In another aspect, the utility model also provides a cell module, including the cell of any one of the above.
[0015] The utility model has the advantages that, unlike the prior art, the cell of the utility model is provided with a groove on a side surface of a shell, a pressure relief hole, an insulating film, a hot melt adhesive film, and an explosion-proof sheet are all located in the groove, which helps to reduce the space occupied by the entire cell product, the insulating film can prevent the electrolyte in the shell from corroding the explosion-proof sheet, thereby protecting the explosion-proof sheet, at least two hollow holes in the insulating film are covered by corresponding at least two hot melt adhesive films, and the explosion-proof sheet is located away from the insulating film on a side of the at least two hot melt adhesive films; the explosion-proof sheet is provided with at least two corresponding first notches, so that the pressure relief reaction of the explosion-proof sheet is faster and more direct, and the failure probability of the explosion-proof sheet is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS
[0016] Fig. 1 is a side view structural schematic diagram of the cell in the utility model embodiment;
[0017] Fig. 2 is another side view structural schematic diagram of the cell in the utility model embodiment;
[0018] Fig. 3 is a partial cross-sectional view structural schematic diagram of the cell in the utility model embodiment;
[0019] Marked name and serial number in the figure: shell-1;Groove-10;Pressure relief hole-101;Insulating film-2;Hollow hole-201;Hot melt adhesive film-3;Explosion-proof sheet-4;First score-401;Protective film-5;Second score-501. DETAILED DESCRIPTION
[0020] The terms "first", "second", "third", and "fourth" and the like in the description and in the claims of the present application and the accompanying drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. The terms "comprises", "comprising", "includes", "including", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of steps or units does not include only those steps or units but can include other steps or units not expressly listed or inherent to such process, method, article, or apparatus. The terms "exemplary" and "example" are used herein to mean "serving as an example, instance, or illustration," and not "preferred" over other examples.
[0021] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.
[0022] "Multiple" means two or more. "And / or", describing the relationship between the associated objects, means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents that the front and rear associated objects are a "or" relationship.
[0023] Moreover, the terms "upper", "lower", "front", "back", "left", "right", "upper end", "lower end", and the like indicating the orientation are all with reference to the attitude position of the device or equipment in normal use as described in the present scheme.
[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.
[0025] Embodiment one: the utility model embodiment provides a kind of electric core, such as Figs. 1 to 3As shown in the middle, the electric core includes a shell 1, a recess 10 is arranged on one side surface of the shell 1, a pressure relief hole 101 is arranged on the side surface opposite to the slot of the recess 10, an insulating film 2 is arranged in the recess 10 and covers the pressure relief hole 101; the insulating film 2 is provided with at least two hollow holes 201 penetrating the pressure relief hole 101, at least two hot melt adhesive films 3 are arranged on the side surface of the insulating film 2 away from the pressure relief hole 101, and the at least two hot melt adhesive films 3 correspond to the at least two hollow holes 201 one by one; the recess 10 is further provided with an explosion-proof sheet 4, and the explosion-proof sheet 4 is located on the side away from the insulating film 2 of the at least two hot melt adhesive films 3; the explosion-proof sheet 4 is provided with at least two first notches 401, and the traces of the at least two first notches 401 correspond to the holes of the at least two hollow holes 201 one by one.
[0026] The electric core of the embodiment of the utility model, through being provided with the recess 10 on one side surface of the shell 1, the pressure relief hole 101, the insulating film 2, the hot melt adhesive film 3 and the explosion-proof sheet 4 are all located in the recess 10, which helps to reduce the space occupied by the whole electric core product, the insulating film 2 can prevent the electrolyte in the shell 1 from corroding the explosion-proof sheet 4, thereby protecting the explosion-proof sheet 4, the at least two hollow holes 201 on the insulating film 2 are covered by the corresponding at least two hot melt adhesive films 3 one by one, and the explosion-proof sheet 4 is located on the side away from the insulating film 2 of the at least two hot melt adhesive films 3; the explosion-proof sheet 4 is provided with at least two corresponding first notches 401, and the notches for pressure relief are divided into multiple parts by using the method of dividing the whole into parts, so that the pressure relief reaction of the explosion-proof sheet 4 is more rapid and direct, and the failure probability of the explosion-proof sheet 4 is effectively reduced.
[0027] Specifically, in the embodiment, the thickness of any hot melt adhesive film 3 is less than the thickness of the insulating film 2, so that the hot melt adhesive film 3 can be rapidly melted by heat under the pressure relief state on the basis of playing a blocking role in the normal state, thereby smoothly conducting pressure relief. There is a gap between any hot melt adhesive film 3 and the explosion-proof sheet 4 to increase the pressure relief space. The gap is 1.0-2.0mm, for example, 1.5mm.
[0028] Specifically, in the embodiment, the explosion-proof sheet 4 is any one of an aluminum alloy explosion-proof sheet, a glass fiber explosion-proof sheet and a ceramic explosion-proof sheet, and the selection of these materials is based on their high strength, high temperature resistance and other characteristics to ensure that the explosion-proof sheet 4 can provide effective protection in the case of pressure relief. Further, in order to increase the protection of the explosion-proof sheet 4, a protective film 5 is attached to the surface of the explosion-proof sheet 4 away from the at least two hot melt adhesive films 3, and the protective film 5 is flush with the notch of the groove 10. To prevent external factors from damaging the explosion-proof sheet 4 in normal state, improve the reliability of the explosion-proof sheet 4. And the area of the protective film 5 covering each first notch 401 is also provided with a second notch 501 corresponding to the first notch 401, to ensure that it has the ability to normally cooperate with pressure relief, so that the entire pressure relief process is smooth. The depth of the first notch 401 is 0.1-0.7mm, for example 0.5mm; the depth of the second notch 501 is 0.1-0.5mm, for example 0.3mm.
[0029] Specifically, in the embodiment, the shape of any one of the hollow holes 201 is a circle or an ellipse, for example, a circle. In actual application, the shape of the hollow hole 201 can also be designed and selected according to actual needs, and the embodiment is not limited specifically, and the drawings are only examples.
[0030] Embodiment two: the utility model embodiment provides a kind of electric core module, and the electric core module includes the electric core provided in embodiment one.
[0031] It should be understood that, for those skilled in the art, modifications or changes can be made according to the above description, and all such modifications and changes shall fall within the scope of the appended claims of the utility model.
Claims
1. A battery cell, comprising a housing, characterized in that: A groove is provided on one side surface of the housing. A pressure relief hole is provided on the side surface of the groove opposite to its opening. An insulating film covering the pressure relief hole is provided in the groove. The insulating film has at least two perforated holes that communicate with the pressure relief hole. At least two hot melt adhesive films are provided on the side surface of the insulating film away from the pressure relief hole, and the at least two hot melt adhesive films cover the at least two perforated holes one by one. An explosion-proof sheet is also provided in the groove. The explosion-proof sheet is located on the side where the at least two hot melt adhesive films are away from the insulating film. The explosion-proof sheet has at least two first engravings, and the marks of the at least two first engravings correspond to the edges of the at least two perforated holes one by one.
2. The battery cell according to claim 1, characterized in that: There is a gap between any of the hot melt adhesive films and the explosion-proof sheet, and the gap is 1.0 to 2.0 mm.
3. The battery cell according to claim 1, characterized in that: A protective film is attached to the surface of the explosion-proof sheet on the side away from at least two hot melt adhesive films, and the protective film has a second groove corresponding to the first groove.
4. The battery cell according to claim 3, characterized in that: The protective film is flush with the groove opening.
5. The battery cell according to claim 3 or 4, characterized in that: The depth of the first groove is 0.1 to 0.7 mm; the depth of the second groove is 0.1 to 0.5 mm.
6. The battery cell according to claim 1, characterized in that: The explosion-proof sheet is any one of aluminum alloy explosion-proof sheet, glass fiber explosion-proof sheet, and ceramic explosion-proof sheet.
7. The battery cell according to claim 1, characterized in that: The thickness of any of the hot melt adhesive films is less than the thickness of the insulating film.
8. The battery cell according to claim 1, characterized in that: The shape of any of the described perforations is either circular or elliptical.
9. A battery cell module, characterized in that: Includes the battery cell described in any one of claims 1-8.