cell

Abstract

The application provides an electric core, and relates to the technical field of batteries. The electric core comprises a top cover, a first insulating layer, a shell, a bottom support plate and a pole core. The shell comprises two openings opposite to each other in a first direction. The top cover and the bottom support plate are respectively arranged on the two openings. The pole core is arranged in the interior of the shell. The first insulating layer is attached to the side of the top cover facing the pole core. The side of the top cover of the electric core of the application facing the shell is provided with the first insulating layer. The first insulating layer can realize the insulation between the pole core and the top cover. The lower plastic for insulating the top cover and the pole core is not arranged in the interior of the shell. Therefore, the space occupied by the pole core in the interior of the shell is increased, and the energy density of the electric core is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell. BACKGROUND

[0002] With the development of lithium ion battery technology, higher demands are put forward for the energy density of the battery cell.

[0003] The battery cell generally comprises a top cover, a lower plastic, a tab, a pole piece, a Mylar film, a bottom support plate and a shell, the shell has two openings opposite to each other, the top cover and the bottom support plate are respectively arranged on the two openings, the lower plastic, the tab and the pole piece are arranged in sequence from top to bottom, and the Mylar film wraps the side of the pole piece. However, there are many structures inside the shell, which makes the space that the pole piece can occupy smaller, and the energy density of the battery cell smaller. SUMMARY

[0004] Therefore, the present application provides a battery cell to solve the problem that there are many structures inside the shell of the existing battery cell, which makes the space that the pole piece can occupy smaller, and the energy density of the battery cell smaller.

[0005] The present application provides a battery cell, which comprises a top cover, a first insulation layer, a shell, a bottom support plate and a pole piece, the shell comprises two openings opposite to each other in a first direction, the top cover and the bottom support plate are respectively arranged on the two openings, the pole piece is arranged inside the shell, and the first insulation layer is attached to one side of the top cover facing the pole piece.

[0006] Preferably, the pole piece comprises a tab and a pole body, and the tab is connected to one side of the pole body facing the top cover.

[0007] The top cover comprises a top cover plate and a pole column, the top cover plate is provided with a through hole penetrating through the top cover plate, the pole column penetrates through the through hole and is connected to the tab, and the first insulation layer is attached to one side of the top cover plate facing the pole piece.

[0008] Preferably, the tab comprises a connecting surface and an extending surface connected to each other, and the connecting surface is connected to the pole column.

[0009] The battery cell further comprises a second insulation layer, and the second insulation layer is attached to the extending surface.

[0010] Preferably, the battery cell further comprises an insulation film, the insulation film wraps the pole body, and the tab extends from the insulation film.

[0011] Preferably, the pole body comprises two first surfaces opposite to each other in the first direction, and the tab extends from one of the first surfaces.

[0012] The insulating film comprises a first wrapping part, the first wrapping part is provided with an extension opening, the first wrapping part is located at the side of the tab of the pole core body, and the tab extends from the extension opening.

[0013] Preferably, the pole core body further comprises two second surfaces opposite to each other in a second direction and two third surfaces opposite to each other on a third surface in a third direction, the area of the second surface is greater than the area of the third surface, and the first direction, the second direction and the third direction are perpendicular to each other;

[0014] The insulating film further comprises two second wrapping parts, two third wrapping parts, two fourth wrapping parts and two fifth wrapping parts, the two second wrapping parts are respectively attached to the two second surfaces, the two third wrapping parts are attached to the same third surface, the two fourth wrapping parts are attached to the other third surface, and the two fifth wrapping parts are attached to the first surface opposite to the tab.

[0015] Preferably, the first wrapping part is further provided with an exhaust port;

[0016] The battery cell further comprises an explosion-proof valve, the top cover plate is provided with a mounting opening penetrating through the top cover plate, the explosion-proof valve is arranged on the mounting opening, and the exhaust port faces the explosion-proof valve.

[0017] Preferably, the insulating film further comprises two first closing parts, the two first closing parts are connected to the two ends of the first wrapping part in the third direction, and the first closing part faces the pole core body;

[0018] The first closing part and the first wrapping part enclose a first containing space, and the first containing space is filled with a flame retardant.

[0019] Preferably, the insulating film further comprises a plurality of second closing parts, the plurality of second closing parts are connected to the side of the first wrapping part facing the pole core body, and the plurality of second closing parts are located between the two first closing parts;

[0020] The second closing part and the first wrapping part enclose a second containing space, and the second containing space is filled with a flame retardant.

[0021] Preferably, the size of the first containing space in the first direction is greater than or equal to the size of the second containing space in the first direction.

[0022] In the electric cell of the application, the electric cell comprises a top cover, a first insulating layer, a shell, a bottom support plate and a pole core, the shell comprises two openings opposite to each other in a first direction, the top cover and the bottom support plate are respectively covered on the two openings, the pole core is arranged in the interior of the shell, and the first insulating layer is attached to the side of the top cover facing the pole core. The side of the top cover of the electric cell in the application facing the shell is provided with the first insulating layer, the insulation between the pole core and the top cover can be realized through the first insulating layer, the lower plastic for insulating the top cover and the pole core is not needed to be arranged in the interior of the shell, so that the space that can be occupied by the pole core in the interior of the shell is increased, thereby the energy density of the electric cell is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed to be used in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 An exploded view of an electric cell according to an embodiment of the application is shown;

[0025] Figure 2 A structural schematic view of a top cover is shown;

[0026] Figure 3 A structural schematic view of a pole core is shown;

[0027] Figure 4 A structural schematic view of an insulating film is shown.

[0028] Figure legend: 1-top cover; 11-pole column; 12-top cover plate; 2-pole core; 21-pole lug; 211-connection surface; 212-extension surface; 22-pole body; 221-first surface; 222-second surface; 223-third surface; 3-insulating film; 31-first wrapping part; 311-outlet; 312-exhaust port; 32-second wrapping part; 33-third wrapping part; 34-fourth wrapping part; 35-fifth wrapping part; 4-bottom support plate; 5-shell; 6-first insulating layer; 7-explosion-proof valve; L1-first direction; L2-second direction; L3-third direction. DETAILED DESCRIPTION

[0029] The following detailed description is presented to aid the reader in gaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, various changes, modifications, and equivalents can be used, and thus particular embodiments described herein are not intended as being exhaustive of what the present disclosure can provide. For example, although processes are described with regard to the present disclosure, such processes can include more, fewer, or only a single process. Additionally, some processes can not be implemented even though they are described. Moreover, although processes are described herein as various separate processes, which can be performed by different systems, such processes can not necessarily be performed by different systems and the order of some processes can be changed, including that certain processes could be performed in an iterative or parallel manner. Additionally, various features that are described herein can be implemented as hardware, software, firmware, or combinations thereof, and can be implemented within one or more processors or external to one or more processors, including being implemented across multiple processors. Further, it will be appreciated that features described herein as being implemented with or across one or more processors can be implemented by one or more other processors.

[0030] The features described herein can be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, the described examples have been provided for illustrative purposes so that those skilled in the art will be able to implement the methods, apparatuses, and / or systems described herein in a variety of ways.

[0031] Throughout the specification, when an element (such as a layer, region, or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, "on top of" another element, or "covering" another element, it can be directly on, connected to, coupled to, adjacent to, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to," "directly adjacent to," "directly on top of," or "directly covering" another element, there are no other elements interposed therebetween.

[0032] As used herein, the term "and / or" includes any one of the listed items and any combination of two or more of the listed items.

[0033] Although terms such as "first" and "second" can be used herein to describe various elements, components, regions, layers, or sections, these elements, components, regions, layers, or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, the first element, component, region, layer, or section described in the examples described herein could also be called a second element, component, region, layer, or section without departing from the teachings of the examples.

[0034] For ease of description, spatial terms, such as "above", "upper", "below", and "lower" can be used herein to describe one element's relationship to another element as the device is positioned in accordance with a drawing. Such spatial term is intended to encompass different orientations of the device in its operation, e.g., orientation of the device is flipped over. For example, if a device in a drawing is flipped over, a component described as above other component would then be oriented below the other component. Accordingly, the spatial term "above" encompasses both a position above and below depending on the orientation of the device. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatial terms used herein interpreted accordingly.

[0035] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, are specifically intended to be construed as open-ended terms i.e., the terms do not exclude additional, unrecited elements or method steps. The terms "by" or "comprising a" or "comprising", or "having", or "including" preceding the recitation of a list of elements or steps, are specifically intended to be construed as open-ended terms i.e., the terms do not exclude additional, unrecited elements or method steps.

[0036] Variations in the shapes of the elements shown in the drawings can occur because of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the precise shapes shown in the drawings, but include variations in shapes that would occur to one of ordinary skill in the art upon inspective of the drawings.

[0037] The features of the examples described herein can be combined in a variety of ways as would be apparent to a person of ordinary skill in the art after inspective of the disclosure. Furthermore, although exemplary examples have been described in some detail, various modifications are possible that fall within the scope of the disclosure as defined by the appended claims.

[0038] The following will be described with reference to Figures 1 to 4 The cell of the present application is described, and Figures 1 to 4 In the embodiment, the first direction L1, the second direction L2 and the third direction L3 are perpendicular to each other.

[0039] As Figures 1 to 4As shown, the battery cell includes a top cover 1, a first insulation layer 6, a shell 5, a bottom support plate 4 and a pole core 2, the shell 5 includes two openings opposite to each other in a first direction L1, the top cover 1 and the bottom support plate 4 are respectively covered on the two openings, the pole core 2 is arranged inside the shell 5, and the first insulation layer 6 is attached to a side of the top cover 1 facing the pole core 2. The side of the top cover 1 in the battery cell of the application facing the shell 5 is provided with the first insulation layer 6, and the insulation between the pole core 2 and the top cover 1 can be realized through the first insulation layer 6, the inside of the shell 5 does not need to be provided with a lower plastic for insulating the top cover 1 and the pole core 2, so that the space that can be occupied by the pole core 2 inside the shell 5 is increased, thereby improving the energy density of the battery cell.

[0040] In addition, by canceling the lower plastic part, the cost of the lower plastic material and the installation cost of the lower plastic can be saved.

[0041] In the embodiment of the application, as shown in the drawings, Figure 2 The top cover 1 includes a top cover plate 12 and a pole 11, the top cover plate 12 and the bottom support plate 4 can be rectangular plates, the top cover plate 12 is provided with a through hole penetrating through the top cover plate 12, the pole 11 can pass through the through hole, and the first insulation layer 6 is attached to a side of the top cover plate 12 facing the pole core 2. In this way, the insulation between the top cover plate 12 and the pole core 2 can be realized through the first insulation layer 6, so that the inside of the shell 5 does not need to be provided with a lower plastic. The number of through holes is two, and the number of poles 11 is also two, two poles 11 pass through the two poles 11 respectively, one of the poles 11 serves as a positive pole 11, and the other pole 11 serves as a negative pole 11.

[0042] As shown in the drawings, Figure 2 The battery cell further includes an explosion-proof valve 7, the top cover plate 12 is provided with a mounting hole penetrating through the top cover plate 12, the mounting hole is located between the two through holes, and the explosion-proof valve 7 is arranged on the mounting hole. When thermal runaway occurs, gas can rush out through the explosion-proof valve 7.

[0043] As shown in the drawings, Figure 3 The pole core 2 includes a tab 21 and a pole core body 22, the pole core body 22 is composed of a positive electrode sheet, a negative electrode sheet and a separator, and the positive electrode sheet and the negative electrode sheet are both provided with the tab 21, the pole 11 serving as a positive pole passes through one through hole and is connected with the tab 21 of the positive electrode sheet, and the pole 11 serving as a negative pole passes through the other through hole and is connected with the tab 21 of the negative electrode sheet.

[0044] Further, the tab 21 comprises a connecting surface 211 and an extending surface 212 connected with each other, the surface of the root of the tab 21 for welding with the pole 11 is the connecting surface 211, and the rest is the extending surface 212. The battery cell further comprises a second insulating layer, which is attached to the extending surface 212. In this way, the part of the tab 21 except the surface for welding with the pole 11 is insulated by the second insulating layer, so as to prevent the problem of short circuit caused by the contact between the tab 21 and the pole due to the bending of the excess tab 21 during the assembly of the battery cell.

[0045] Optionally, an alkaline material can be added in the second insulating layer to absorb HF in the electrolyte, further improving the safety of the battery cell during operation.

[0046] In the embodiment of the present application, the battery cell further comprises an insulating film 3, which covers the core body 22, and the tab 21 extends from the insulating film 3. By covering the core body 22 with the insulating film 3, the insulation between the core body 22 and the shell 5 can be achieved.

[0047] Further, the core body 22 comprises two first surfaces 221 opposite to each other in the first direction L1, two second surfaces 222 opposite to each other in the second direction L2, and two third surfaces 223 opposite to each other in the third direction L3, the tab 21 extends from one first surface 221, the area of the second surface 222 is larger than that of the third surface 223, and the two first surfaces 221, the two second surfaces 222 and the two third surfaces 223 are attached to different parts of the insulating film 3, respectively, to achieve the insulation of different positions of the core body 22.

[0048] As shown in Figure 4 the insulating film 3 comprises a first wrapping part 31, two second wrapping parts 32, two third wrapping parts 33, two fourth wrapping parts 34 and two fifth wrapping parts 35, the two second wrapping parts 32 are connected with the two sides of the first wrapping part 31 in the second direction L2, respectively, the two third wrapping parts 33 are connected with the same side of the two second wrapping parts 32 in the third direction L3, respectively, the two fourth wrapping parts 34 are connected with the other side of the two second wrapping parts 32 in the third direction L3, respectively, and the two fifth wrapping parts 35 are connected with the side of the two second wrapping parts 32 opposite to the first wrapping part 31, respectively.

[0049] Further, the first wrapping part 31 is provided with an extension opening 311, the first wrapping part 31 is located at the side of the core body 22 where the tab 21 is located, and the tab 21 extends from the extension opening 311, so as to facilitate the connection between the tab 21 and the pole 11. At the same time, by providing the first wrapping part 31, the insulation between the core body 22 and the top cover 1 can be further improved.

[0050] Optionally, the first wrapping part 31 is further provided with an exhaust port 312; the exhaust port 312 faces the explosion-proof valve 7, and when thermal runaway occurs, the gas can be discharged to the explosion-proof valve 7 through the exhaust port 312 and then discharged from the shell 5.

[0051] As shown in Figure 4 the dashed lines are the boundaries between the first wrapping part 31 and the second wrapping part 32, the second wrapping part 32 and the third wrapping part 33, the second wrapping part 32 and the fourth wrapping part 34, and the fifth wrapping part 35. When wrapping the insulation film 3 on the pole core body 22, the bending can be performed at the positions of the dashed lines. Specifically, the first wrapping part 31 is attached to the first first surface 221, the two second wrapping parts 32 are bent so that the two second wrapping parts 32 are attached to the two second surfaces 222 respectively; the two third wrapping parts 33 are bent to the first third surface 223 to cover the first third surface 223, and the two third wrapping parts are welded together by heat melting after being overlapped; the two fourth wrapping parts 34 are bent to the second third surface 223 to cover the second third surface 223, and the two fourth wrapping parts are welded together by heat melting after being overlapped; and the two fifth wrapping parts 35 are bent to the second first surface 221 to cover the second first surface 221, and the two fifth wrapping parts are welded together by heat melting after being overlapped. In this way, the entire pole core body 22 is coated by the cooperation of the first wrapping part 31, the two second wrapping parts 32, the two third wrapping parts 33, the two fourth wrapping parts 34, and the two fifth wrapping parts 35.

[0052] In the embodiment of the present application, the insulation film 3 further comprises two first closing parts, both of which are connected to the two ends of the first wrapping part 31 in the third direction L3, and the first closing part faces the pole core body 22; the first closing part and the first wrapping part 31 enclose a first containing space, and the first containing space is filled with a fire retardant. When thermal runaway occurs, the fire retardant in the first containing space can prevent the risk of heat spread.

[0053] Further, the insulation film 3 further comprises a plurality of second closing parts, which are connected to the side of the first wrapping part 31 facing the pole core body 22, and the plurality of second closing parts are located between the two first closing parts; the second closing part and the first wrapping part 31 enclose a second containing space, and the second containing space is filled with a fire retardant. When thermal runaway occurs, the fire retardant in the second containing space can also prevent the risk of heat spread. Optionally, the plurality of second closing parts are arranged at intervals, and the plurality of second closing parts surround the exhaust port 312 to avoid the exhaust port 312.

[0054] In addition, the size of the first accommodating space in the first direction L1 is greater than or equal to the size of the second accommodating space in the first direction L1. When the flame retardant is filled into the first accommodating space and the second accommodating space, at least two first closing parts can be in abutment with the pole core body 22, and the first wrapping part 31 is attached to the top cover plate 12, thereby achieving the limiting of the pole core body 22.

[0055] In the electric core of the present application, the inside of the shell 5 does not need to be provided with a lower plastic for insulating the top cover 1 and the pole core 2, so that the space occupied by the pole core 2 in the inside of the shell 5 is increased, thereby improving the energy density of the electric core.

[0056] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric cell, characterized by, The electric core comprises a top cover, a first insulation layer, a shell, a bottom support plate and a pole core, the shell comprises two openings opposite to each other in a first direction, the top cover and the bottom support plate are respectively covered on the two openings, the pole core is arranged in the interior of the shell, and the first insulation layer is attached to the side of the top cover facing the pole core; The pole core comprises a pole tab and a pole core body, and the pole tab is connected to the side of the pole core body facing the top cover; The electric core further comprises an insulation film, the insulation film wraps the pole core body, and the pole tab extends out of the insulation film; The pole core body comprises two first surfaces opposite to each other in the first direction, and the pole tab extends out of one of the first surfaces; The insulation film comprises a first wrapping part, the first wrapping part is provided with an extension opening, the first wrapping part is located on the side of the pole core body where the pole tab is located, and the pole tab extends out of the extension opening; The pole core body further comprises two second surfaces opposite to each other in a second direction and two third surfaces opposite to each other in a third direction, the area of the second surface is greater than the area of the third surface, and the first direction, the second direction and the third direction are perpendicular to each other; The insulation film further comprises two first closing parts, the two first closing parts are connected to the two ends of the first wrapping part in the third direction, and the first closing part faces the pole core body; The first closing part and the first wrapping part enclose a first containing space, and the first containing space is filled with a flame retardant; The insulation film further comprises a plurality of second closing parts, the plurality of second closing parts are connected to the side of the first wrapping part facing the pole core body, and the plurality of second closing parts are located between the two first closing parts; The second closing part and the first wrapping part enclose a second containing space, and the second containing space is filled with a flame retardant; The size of the first containing space in the first direction is greater than or equal to the size of the second containing space in the first direction.

2. The electric cell of claim 1, wherein, The top cover comprises a top cover plate and a pole column, the top cover plate is provided with a through hole penetrating through the top cover plate, the pole column penetrates through the through hole and is connected to the pole tab, and the first insulation layer is attached to the side of the top cover plate facing the pole core.

3. The electric cell of claim 2, wherein, The pole tab comprises a connecting surface and an extending surface connected to each other, and the connecting surface is connected to the pole column; The electric core further comprises a second insulation layer, and the second insulation layer is attached to the extending surface.

4. The electric cell of claim 1, wherein, The insulation film further comprises two second wrapping parts, two third wrapping parts, two fourth wrapping parts and two fifth wrapping parts, the two second wrapping parts are respectively attached to the two second surfaces, the two third wrapping parts are attached to the same third surface, the two fourth wrapping parts are attached to the other third surface, and the two fifth wrapping parts are attached to the first surface opposite to the pole tab.

5. The electric cell of claim 2, wherein, The first wrapping part is further provided with an exhaust opening; The electric core further comprises an explosion-proof valve, the top cover plate is provided with a mounting opening penetrating through the top cover plate, the explosion-proof valve is arranged on the mounting opening, and the exhaust opening faces the explosion-proof valve.

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