Battery cell and battery module

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a battery cell and a battery module. The battery cell comprises a shell, an anti-explosion valve, a first insulating membrane and a second insulating membrane; the shell comprises two first side faces perpendicular to the width direction and two second side faces perpendicular to the thickness direction. Wherein one first side face is provided with an anti-explosion valve, a first insulating diaphragm is attached to the first side face, the first insulating diaphragm wraps the anti-explosion valve, an indentation easy to explode is arranged at the position corresponding to the anti-explosion valve, and the second insulating diaphragm wraps the other first side face and the two second side faces. Or the explosion-proof valves are arranged on the two first side faces, the first insulating membranes are attached to the two first side faces, and the two second side faces are wrapped with the second insulating membranes. According to the battery cell and the battery module, the problems that in an existing battery cell film coating form, if a hole is formed in a blue film explosion-proof valve for coating, automatic production of film coating equipment is not facilitated, and if the hole is directly formed in the blue film explosion-proof valve for avoiding space, the safety requirement cannot be met are solved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a battery cell and a battery module. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. As a result, the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] Lithium cells are the core components of battery pack safety and assembly, and their structural design is crucial to cell safety. Existing cell structures mostly use blue films to insulate the cells.

[0004] However, in the blue film coating form, if the explosion-proof valve is directly coated inside the blue film, this will affect the normal opening of the explosion-proof valve and the outward turning action, seriously affecting the safety performance of the battery cell.

[0005] However, if a hole is opened at the blue film explosion-proof valve for coating, the positioning distance between the edge of the blue film and the explosion-proof valve must be precise, and the coating equipment needs to be positioned multiple times, which is not conducive to automatic production of the coating equipment.

[0006] If a hole is directly opened at the blue film explosion-proof valve to avoid air, the insulation and creepage distance of the exposed part of the battery cell casing will not meet safety requirements. Utility Model Content

[0007] The purpose of the present application is to provide a battery cell and a battery module, thereby solving the problem in the existing battery cell coating form that if a hole is opened at the blue film explosion-proof valve for coating, it is not conducive to the automatic production of the coating equipment, and if a hole is directly opened at the blue film explosion-proof valve to avoid air, it cannot meet the safety requirements.

[0008] According to a first aspect of the present application, a battery cell is provided, the battery cell comprising a shell, an explosion-proof valve, a first insulating diaphragm and a second insulating diaphragm; the battery cell has a length direction, a width direction and a thickness direction perpendicular to each other; the shell comprises two first side surfaces perpendicular to the width direction, and two second side surfaces perpendicular to the thickness direction; one of the first side surfaces is provided with the explosion-proof valve, one of the first side surfaces is adhered to the first insulating diaphragm, the first insulating diaphragm is coated on the explosion-proof valve, and an indentation that is easy for the explosion-proof valve to explode is provided at a position corresponding to the explosion-proof valve, and the second insulating diaphragm is coated on the other first side surface and two second side surfaces of the shell; or, the explosion-proof valve is provided on both first side surfaces, the first insulating diaphragm is adhered to both first side surfaces, the first insulating diaphragm is coated on the explosion-proof valve, and an indentation that is easy for the explosion-proof valve to explode is provided at a position corresponding to the explosion-proof valve, and the second insulating diaphragm is coated on the two second side surfaces of the shell.

[0009] In any of the above technical solutions, further, the first insulating diaphragm is adhered to the first side surface of the housing and the explosion-proof valve.

[0010] In any of the above technical solutions, further, the thickness of the first insulating film is 0.1 mm to 1 mm.

[0011] In any of the above technical solutions, further, the thickness of the second insulating film is 0.085 mm to 0.11 mm.

[0012] In any of the above technical solutions, further, the explosion-proof valve includes an effective exhaust area; the first insulating diaphragm is provided with an indentation area corresponding to the effective exhaust area of ​​the explosion-proof valve, and the indentation that facilitates the explosion of the explosion-proof valve is provided in the indentation area; the area of ​​the indentation area is larger than the area of ​​the effective exhaust area.

[0013] In any of the above technical solutions, further, the area of ​​the indentation region is greater than 1.1 times the area of ​​the effective exhaust region.

[0014] In any of the above technical solutions, further, the indentation includes an outer ring indentation and an internal indentation arranged inside the outer ring indentation; the outer ring indentation is arranged at the outer edge of the indentation area; and / or the internal indentation includes a "Y" type, "Z" type, "X" type or "H" type structure, and there is an isolation gap between the internal indentation and the outer ring indentation.

[0015] In any of the above technical solutions, further, the explosion-proof valve includes a protruding structure protruding relative to the surface of the shell; the first insulating diaphragm includes a protruding portion that imitates the protruding structure; and the indentation area is arranged on the protruding portion.

[0016] In any of the above technical solutions, further, the residual thickness of the indentation is greater than 0.06 mm.

[0017] According to a second aspect of the present application, a battery module is provided, comprising the battery cell as described above.

[0018] The battery cell of the present application includes a shell, an explosion-proof valve, a first insulating diaphragm and a second insulating diaphragm. The battery cell has a length direction, a width direction and a thickness direction that are perpendicular to each other; the shell includes two first side surfaces that are perpendicular to the width direction, and two second side surfaces that are perpendicular to the thickness direction; one of the first side surfaces is provided with an explosion-proof valve, one of the first side surfaces is attached with a first insulating diaphragm, the first insulating diaphragm is coated on the explosion-proof valve, and an indentation that is easy for the explosion-proof valve to explode is provided at the position corresponding to the explosion-proof valve, and the second insulating diaphragm is coated on the other first side surface and the two second side surfaces of the shell; or, both first side surfaces are provided with the explosion-proof valve, both first side surfaces are attached with the first insulating diaphragm, the first insulating diaphragm is coated on the explosion-proof valve, and an indentation that is easy for the explosion-proof valve to explode is provided at the position corresponding to the explosion-proof valve, and the second insulating diaphragm is coated on the two second side surfaces of the shell.

[0019] According to the above technical features, the beneficial effects of this application are:

[0020] The explosion-proof valve of the present application is arranged on the side of the shell, and the second insulating diaphragm is not covered on this side to avoid air directly. On the side where the explosion-proof valve is located, a first insulating diaphragm is separately arranged to cover it. The first insulating diaphragm does not have a hole corresponding to the position of the explosion-proof valve, but is provided with an indentation that is easy for the explosion-proof valve to explode (it can provide all-round protection for the explosion-proof valve, such as external scratches, electrolyte pollution, dust, etc.). In this way, when the explosion-proof valve is depressurized, the indentation of the first insulating diaphragm can be torn without affecting the opening of the explosion-proof valve.

[0021] In summary, the first insulating diaphragm of the present application is coated on the explosion-proof valve and an indentation corresponding to the explosion-proof valve is provided, which is easy for the explosion-proof valve to explode. Compared with the prior art, not only will the insulation and creepage distances not fail to meet safety requirements due to the exposure of the battery cell shell (explosion-proof valve), but also the opening of the explosion-proof valve will not be affected on this basis. Moreover, on this basis, neither the first insulating diaphragm nor the second insulating diaphragm needs to have holes opened, and thus the coating equipment does not need to be positioned multiple times, which will not affect the automatic production of the coating equipment.

[0022] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1A schematic diagram showing the overall exploded structure of a battery cell according to an embodiment of the present application;

[0025] Figure 2 A top view of a battery cell according to an embodiment of the present application is shown;

[0026] Figure 3 A schematic diagram showing an indentation area of ​​an embodiment of the present application;

[0027] Figure 4 A schematic diagram showing the indentation of the present application under a first example;

[0028] Figure 5 A schematic diagram showing the indentation of the present application under a second example;

[0029] Figure 6 A schematic diagram showing a first insulating film according to an embodiment of the present application;

[0030] Figure 7 A top view of a housing of an embodiment of the present application is shown;

[0031] Figure 8 Show Figure 7 BB cross-sectional view.

[0032] Icon: 100-first insulating diaphragm; 101-raised portion; 102-indentation area; 103-outer ring indentation; 104-internal indentation; 200-housing; 201-first side; 202-second side; 300-cover; 400-explosion-proof valve; 401-raised structure; 402-effective exhaust area; 500-second insulating diaphragm; X-length direction; Y-width direction; Z-thickness direction. DETAILED DESCRIPTION

[0033] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0034] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0035] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0036] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0037] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0038] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the 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 relational terms used herein will be interpreted accordingly.

[0039] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0040] Variations in the shapes shown in the 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 drawings but include variations in shapes that occur during manufacturing.

[0041] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0042] The first aspect of the present application provides a battery cell, thereby solving the problem in the existing battery cell coating form that if a hole is opened at the blue film explosion-proof valve for coating, it will be unfavorable for automatic production of the coating equipment, and if a hole is directly opened at the blue film explosion-proof valve to avoid air, it will not meet the safety requirements.

[0043] Refer to the following Figures 1 to 8 The battery cells described in some embodiments of the present application are described in detail.

[0044] like Figure 1 As shown, the battery cell of the present application includes a housing 200, a cover plate 300, an explosion-proof valve 400, a first insulating diaphragm 100 and a second insulating diaphragm 500. The cover plate 300 is arranged at the end of the housing 200; the battery cell has a length direction X, a width direction Y and a thickness direction Z that are perpendicular to each other; the housing 200 includes two first side surfaces 201 perpendicular to the width direction Y, and two second side surfaces 202 perpendicular to the thickness direction Z.

[0045] In one example, Figure 1 As shown, the explosion-proof valve 400 is arranged on one of the first side surfaces 201 of the shell 200, the first insulating diaphragm 100 is attached to one of the first side surfaces 201 of the shell 200, and covers the explosion-proof valve 400; the first insulating diaphragm 100 is provided with an indentation corresponding to the position of the explosion-proof valve 400 to facilitate the explosion of the explosion-proof valve 400; the second insulating diaphragm 500 covers the other first side surface and two second side surfaces 202 of the shell 200.

[0046] In another example (not shown in the figure), both first side surfaces 201 are provided with explosion-proof valves 400, both first side surfaces 201 are adhered with first insulating diaphragms 100, the upper and lower first insulating diaphragms 100 are both covered on the explosion-proof valves 400, and each first insulating diaphragm 100 is provided with an indentation corresponding to the position of the explosion-proof valve 400 to facilitate the explosion of the explosion-proof valve, and the second insulating diaphragm 500 is covered on the two second side surfaces 202 of the outer shell.

[0047] The explosion-proof valve 400 of the present application is arranged on the side of the housing 200, and the second insulating diaphragm 500 does not cover this side and directly avoids air. On the side where the explosion-proof valve 400 is located, a first insulating diaphragm 100 is separately arranged for covering. The first insulating diaphragm 100 does not have a hole corresponding to the position of the explosion-proof valve 400, but is provided with an indentation that is easy for the explosion of the explosion-proof valve 400 (it can provide all-round protection for the explosion-proof valve 400, such as external scratches, electrolyte pollution, dust, etc.), so that when the explosion-proof valve 400 is depressurized, the indentation of the first insulating diaphragm 100 can be torn without affecting the opening of the explosion-proof valve 400.

[0048] In summary, the first insulating diaphragm 100 of the present application is coated on the explosion-proof valve 400 and an indentation corresponding to the explosion-proof valve 400 is provided, which is easy for the explosion-proof valve 400 to explode. Compared with the prior art, not only will the insulation and creepage distances not fail to meet safety requirements due to the exposure of the battery cell housing 200 (explosion-proof valve 400), but also the opening of the explosion-proof valve 400 will not be affected on this basis. Moreover, on this basis, neither the first insulating diaphragm 100 nor the second insulating diaphragm 500 needs to be opened, and the film coating equipment does not need to be positioned multiple times, which will not affect the automatic production of the film coating equipment.

[0049] In the embodiments of the present application, Figure 2 As shown, the explosion-proof valve 400 includes an effective exhaust area 402 (i.e. Figure 2 The first insulating diaphragm 100 is provided with an indentation area 102 corresponding to the effective exhaust area 402 of the explosion-proof valve 400, and the indentation that is easy for the explosion-proof valve 400 to explode is provided in the indentation area 102; when the explosion-proof valve 400 releases pressure, the indentation area 102 of the first insulating diaphragm 100 can be torn.

[0050] In this example, the area of ​​the indentation region 102 is larger than the area of ​​the effective exhaust region 402. In this way, the pressure relief efficiency of the explosion-proof valve 400 is not affected.

[0051] Preferably, the area of ​​the indentation region 102 is greater than 1.1 times the area of ​​the effective exhaust region 402 .

[0052] The following will refer to Figures 3 to 5 Describe the shape of the indentation of this application.

[0053] like Figures 3 to 5As shown, the indentation includes an outer ring indentation 103 and an inner indentation 104 disposed inside the outer ring indentation 103. The outer ring indentation 103 is disposed at the outer edge of the indentation area 102; the inner indentation 104 includes a "Y" type, "Z" type, "X" type or "H" type structure.

[0054] For example, Figure 3 and Figure 4 As shown, the internal indentation 104 comprises a "Y" shape; Figure 5 As shown, the internal indentation 104 comprises an "X" shape.

[0055] In this example, Figures 3 to 5 As shown, there is an isolation gap between the inner indentation 104 and the outer ring indentation 103. The isolation gap can prevent the indentation area 102 from being broken by external force.

[0056] In the embodiments of the present application, Figure 1 and Figure 8 As shown, the explosion-proof valve 400 includes a protruding structure 401 protruding relative to the surface of the housing. Figure 6 As shown, the first insulating diaphragm 100 includes a protruding portion 101 conforming to the protruding structure 401 ; the indentation area 102 is disposed on the protruding portion 101 and corresponds to the effective exhaust area 402 of the explosion-proof valve 400 .

[0057] In the embodiment of the present application, the first insulating diaphragm 100 may be a thin-walled insulating diaphragm with adhesive backing, so that the first insulating diaphragm 100 may be adhered to the first side surface 201 of the housing 200 and the explosion-proof valve 400 .

[0058] As an example, the thickness of the first insulating film 100 may be 0.1 mm to 1 mm. The residual thickness of the indentation is greater than 0.06 mm, where the residual thickness refers to the remaining thickness at the indentation.

[0059] As an example, the thickness of the second insulating film 500 may be 0.085 mm to 0.11 mm.

[0060] In summary, the first insulating diaphragm 100 of the present application is coated on the explosion-proof valve 400 and an indentation corresponding to the position of the explosion-proof valve 400 is provided to facilitate the explosion of the explosion-proof valve 400. Compared with the prior art, the insulation withstand voltage and creepage distance at the explosion-proof valve 400 of the battery cell meet safety requirements.

[0061] Furthermore, on this basis, when the explosion-proof valve 400 opens, the indentation area 102 of the first insulating diaphragm 100 can be torn instantly, and does not hinder the normal exhaust of the explosion-proof valve 400.

[0062] Furthermore, on this basis, no hole needs to be opened in either the first insulating film 100 or the second insulating film 500, and the requirement for the insulating film coating accuracy is relatively low, thereby reducing the process cost and improving the production efficiency.

[0063] According to a second aspect of the present application, a battery module is provided, comprising the battery cell as described above.

[0064] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. A battery cell, characterized in that: The battery core comprises a shell, an explosion-proof valve, a first insulating diaphragm and a second insulating diaphragm; The battery core has a length direction, a width direction and a thickness direction that are perpendicular to each other; The housing comprises two first side surfaces perpendicular to the width direction, and two second side surfaces perpendicular to the thickness direction; The explosion-proof valve is disposed on one of the first side surfaces, the first insulating diaphragm is attached to one of the first side surfaces, the first insulating diaphragm is coated on the explosion-proof valve, and an indentation is disposed at a position corresponding to the explosion-proof valve so as to facilitate the explosion of the explosion-proof valve, and the second insulating diaphragm is coated on the other first side surface and two second side surfaces of the housing; Alternatively, the explosion-proof valve is provided on both first side surfaces, the first insulating diaphragm is adhered to both first side surfaces, the first insulating diaphragm is covered on the explosion-proof valve, and an indentation that facilitates the explosion of the explosion-proof valve is provided at a position corresponding to the explosion-proof valve, and the second insulating diaphragm is covered on the two second side surfaces of the outer shell.

2. The battery cell according to claim 1, characterized in that: The first insulating diaphragm is adhered to the first side surface of the housing and the explosion-proof valve.

3. The battery cell according to claim 1, characterized in that: The thickness of the first insulating film is 0.1 mm to 1 mm.

4. The battery cell according to claim 1, characterized in that: The thickness of the second insulating film is 0.085 mm to 0.11 mm.

5. The battery cell according to claim 1, characterized in that: The explosion-proof valve includes an effective exhaust area; The first insulating diaphragm is provided with an indentation area corresponding to the effective exhaust area of ​​the explosion-proof valve, and the indentation that facilitates the explosion of the explosion-proof valve is provided in the indentation area; The area of ​​the indentation region is greater than the area of ​​the effective exhaust region.

6. The battery cell according to claim 5, characterized in that: The area of ​​the indentation region is greater than 1.1 times the area of ​​the effective exhaust region.

7. The battery cell according to claim 5, characterized in that: The indentation includes an outer ring indentation and an inner indentation arranged inside the outer ring indentation; The outer ring indentation is arranged at the outer edge of the indentation area; And / or, the internal indentation includes a "Y"-type, "Z"-type, "X"-type or "H"-type structure, and there is an isolation gap between the internal indentation and the outer ring indentation.

8. The battery cell according to claim 5, characterized in that: The explosion-proof valve includes a protruding structure protruding relative to the surface of the housing; The first insulating film includes a protrusion conforming to the protrusion structure; The indentation area is arranged on the raised portion.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The residual thickness of the indentation is greater than 0.06 mm.

10. A battery module, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 9.

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