Battery cell and battery

Abstract

The utility model discloses a battery cell and a battery, and relates to the technical field of batteries. The battery cell comprises an insulating film and a plurality of core packages, the insulating film is in a bag shape, an opening is formed in one end of the insulating film, the insulating film is provided with a containing cavity communicated with the opening, the plurality of core packages are located in the containing cavity, and a support is arranged between every two adjacent core packages.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell and a battery. Background Technology

[0002] Lithium-ion batteries, due to their high energy density, long battery life, and high safety performance, have been widely used in smartphones, energy storage, electric vehicles, and other fields. During the assembly process, a blue film (inner protective film) is typically applied to the surface of the cell pack, and a bottom support is attached for insulation. However, this method causes electrolyte to deposit at the bottom of the casing, which is detrimental to the wettability of the cell pack in large batteries. Poor wettability affects the cell's performance, and in the later stages of cycling, the rebound of the negative electrode causes the cells to bond more tightly, creating safety hazards during subsequent cell disassembly. Utility Model Content

[0003] This application provides a cell and battery that can prevent electrolyte from depositing at the bottom of the casing and avoid the problem of difficulty in disassembling multiple cell packs.

[0004] In a first aspect, this application provides a battery cell, which includes an insulating film and a plurality of core packages. The insulating film is bag-shaped, with an opening at one end and a receiving cavity communicating with the opening. The plurality of core packages are located in the receiving cavity, and a support is provided between two adjacent core packages.

[0005] In one possible design of the first aspect, the support includes a support body, which includes a first side and a second side. Two core packages adjacent to the support are in contact with the first side and the second side, respectively. The support body has multiple through holes that penetrate the first side and the second side.

[0006] In one possible design approach of the first aspect, the through hole is circular, elliptical, triangular, or quadrilateral in shape.

[0007] In one possible design of the first aspect, a heat transfer cavity is also provided inside the support body, and the heat transfer cavity is not connected to the through hole.

[0008] In one possible design of the first aspect, the heat transfer cavity includes a plurality of heat transfer holes disposed on a support body between two through holes.

[0009] In one possible design of the first aspect, the axis of the heat transfer hole is perpendicular to the axis of the through hole.

[0010] In one possible design of the first aspect, there are two core packages, the insulating film is cuboid in shape, the difference between the length of the insulating film and the length of the core package is 1 mm to 2 mm, and the difference between the width of the insulating film and the sum of the widths of the two core packages is 1 mm to 2 mm.

[0011] In one possible design of the first aspect, the thickness of the insulating film is 50 μm to 60 μm.

[0012] In one possible design of the first aspect, the cell also includes a housing and a cover plate, with the cover plate covering the housing to form a closed space, an insulating film located inside the housing, and the core package connected to the cover plate via tabs.

[0013] In a first aspect, this application provides a battery, including the cell in the first aspect and any possible design thereof.

[0014] The beneficial effects of this application are:

[0015] In this application, a bag-shaped insulating film is used, and the core pack is placed within the receiving cavity of the insulating film. Electrolyte can be directly injected into the receiving cavity of the insulating film to wet the core pack. The electrolyte does not need to contact the cell casing, which helps prevent electrolyte deposition at the bottom of the cell casing. By setting supports between the core packs, direct contact between multiple core packs can be avoided, preventing difficulty in separating the core packs after expansion in the later stages of cycling. This makes core pack separation easier and avoids the risk of fire during disassembly. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0018] Figure 2 An exploded view of a battery cell provided in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the structure of an insulating film in a battery cell provided in an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the structure of a bracket provided in an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of another support structure provided in an embodiment of this application.

[0022] In the diagram: 110 - Insulating film; 120 - Core package; 130 - Support; 140 - Housing; 150 - Cover plate; 160 - Tab;

[0023] 111 - Opening; 112 - Receiving cavity;

[0024] 131-Support body; 132-Through hole; 133-First side; 134-Second side; 135-Heat transfer cavity; 136-Heat transfer hole. Detailed Implementation

[0025] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0026] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0027] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0028] It should be understood that the terminology used in the description of the various examples herein is for the purpose of describing the particular examples only and is not intended to be restrictive. As used in the description of the various examples, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context explicitly indicates otherwise.

[0029] In this application, "at least one" means one, two, or more, and "more than" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0030] It should also be understood that, in this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a sliding connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0031] It should also be understood that the term “comprising” (also referred to as “includes”, “including”, “comprises” and / or “comprising”) as used in this specification specifies the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0032] It should be understood that the terms "an embodiment," "another embodiment," and "a possible design" used throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment or implementation is included in at least one embodiment of this application. Therefore, phrases such as "in one embodiment of this application," "in another embodiment of this application," and "a possible design" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0033] It should also be understood that the specific values ​​mentioned in the embodiments of this application are not intended to limit the specific dimensions of particular features or structures. The relevant values ​​may be illustrative examples for ease of understanding, or they may represent the theoretically optimal value for a certain feature. In practice, the relevant dimensions may be a range of values, such as ±10% or ±20% of the optimal theoretical value, depending on whether the corresponding technical effect can be achieved.

[0034] The term "perpendicular" in this application's embodiments includes similar cases, such as angles between lines, lines and surfaces, or surfaces ranging from 80° to 100°, which can also be understood as perpendicular, rather than strictly limiting the angle between them to 90°. Similarly, the term "parallel" in this application's embodiments also includes similar cases, namely angles between lines, lines and surfaces, or surfaces ranging from 0° to 10°, which can also be understood as parallel.

[0035] Lithium-ion batteries, due to their high energy density, long battery life, and high safety performance, have been widely used in smartphones, energy storage, electric vehicles, and other fields. During the assembly process, a blue film (inner protective film) is typically applied to the surface of the cell pack, and a bottom support is attached for insulation. However, this method causes electrolyte to deposit at the bottom of the casing, which is detrimental to the wettability of the cell pack in large batteries. Poor wettability affects the cell's performance, and in the later stages of cycling, the rebound of the negative electrode causes the cells to bond more tightly, creating safety hazards during subsequent cell disassembly.

[0036] To address the aforementioned problems, this application provides a battery cell. (See reference...) Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application. Figure 2 This is an exploded view of a battery cell provided in an embodiment of this application. Figure 3 This is a schematic diagram of the structure of an insulating film in a battery cell provided in an embodiment of this application.

[0037] like Figure 1 and Figure 2 As shown, an embodiment of this application includes an insulating film 110 and a plurality of core packages 120. Wherein, as... Figure 3 As shown, the insulating film 110 is bag-shaped, with an opening 111 at one end and a receiving cavity 112 communicating with the opening 111. Multiple core packages 120 are located within the receiving cavity 112, and a support 130 is provided between two adjacent core packages 120.

[0038] In this embodiment of the application, the number of core packages 120 is set to multiple, for example, such as Figure 1 and Figure 2 As shown, the number of core packages 120 is set to 2. Alternatively, the number of core packages 120 can be set to 4. Or, a greater number of core packages 120 can be set, such as 6 or 8. In this embodiment, the number of core packages 120 is described as 2.

[0039] In this embodiment, a bag-shaped insulating film 110 is provided, and the core package 120 is disposed within the receiving cavity 112 of the insulating film 110. Electrolyte can be directly injected into the receiving cavity 112 of the insulating film 110 to wet the core package 120. The electrolyte does not need to contact the cell casing 140, which helps to prevent electrolyte deposition at the bottom of the cell casing 140. By providing supports 130 between the core packages 120, direct contact between multiple core packages 120 can be avoided, preventing the core packages 120 from becoming difficult to separate after expansion in the later stages of cycling. This makes it easier to separate the core packages 120 and avoids the risk of fire during disassembly.

[0040] In one embodiment of this application, reference is made to Figure 1 , Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of a support structure provided in an embodiment of this application. Figure 5 This is a schematic diagram of another support structure provided in an embodiment of this application.

[0041] like Figure 4 and Figure 5 As shown, the bracket 130 includes a bracket body 131 and a through hole 132 disposed on the bracket body 131. Wherein, as... Figure 1As shown, the support body 131 includes a first side 133 and a second side 134. Since the support 130 is disposed between two core packages 120, of the two core packages 120 adjacent to the support 130, one core package 120 contacts the first side 133 of the support body 131, and the other core package 120 contacts the second side 134 of the support body 131. That is, the first side 133 and the second side 134 of the support body 131 refer to the two sides of the support body 131 that respectively contact the two core packages 120.

[0042] The support body 131 has multiple through holes 132, which penetrate the first side 133 and the second side 134. That is, one end of the through hole 132 is located on the first side 133, and the other end is located on the second side 134. When the support 130 is placed between two core packages 120, since both core packages 120 are in contact with the support 130, the multiple through holes 132 on the support 130 allow the electrolyte to flow through the through holes 132 on the support 130, thus wetting the sides of the core packages 120 that are in contact with the support 130. This improves the wettability of the electrode sheets in the core packages 120 and enhances the electrical performance of the battery cell.

[0043] In one embodiment of this application, the through hole 132 on the support 130 mainly facilitates the flow of electrolyte to wet the core packing 120 on both sides of the support 130. Therefore, the main function of the through hole 132 is to allow the electrolyte to flow through, and thus the shape of the through hole 132 is not limited in this embodiment. The through hole 132 can be set to various common shapes, such as a circle, ellipse, triangle, quadrilateral, polygon, or other regular shapes. The shape of the through hole 132 can also be set to various irregular shapes, but it is necessary to ensure that one end of the through hole 132 is located on the first side 133 and the other end is located on the second side 134. That is, the electrolyte can flow from the first side 133 to the second side 134 through the through hole 132. In this embodiment, for ease of processing, the shape of the through hole 132 can generally be set to a circle, square, or rectangle. Figure 4 As shown, Figure 4 The through hole 132 is circular in shape. For example... Figure 5 As shown, Figure 5 The shape of the through hole 132 is set to be circular.

[0044] In one embodiment of this application, since the core packages 120 of the two brackets 130 will generate heat during operation, and the heat dissipation of the side of the core package 120 that is in contact with the first side 133 and the second side 134 is worse than that of the other sides, the heat accumulation on the side of the core package 120 that is in contact with the first side 133 and the side of the core package 120 that is in contact with the second side 134 may be more severe.

[0045] To address this issue, in the embodiments of this application, as follows: Figure 4 and Figure 5 As shown, a heat transfer cavity 135 is also provided inside the bracket body 131, wherein the heat transfer cavity 135 is not connected to the through hole 132. Water or other liquids can be added to the heat transfer cavity 135, and the heat transfer cavity 135 is sealed after the liquid is added. Since the bracket 130 is provided with a heat transfer cavity 135, and a heat-conducting liquid is added to the heat transfer cavity 135, the thermal conductivity of the bracket 130 is improved. When the core packages 120 on both sides of the bracket 130 come into contact with the bracket 130, the heat generated on the side of the core package 120 that is in contact with the bracket 130 can be conducted away through the bracket 130 with the heat transfer cavity 135, so that the heat conduction on the side of the core package 120 that is in contact with the bracket 130 can be more uniform, and heat accumulation is avoided from affecting the performance of the battery cell.

[0046] In one embodiment of this application, since the support body 131 is provided with multiple through holes 132, and the heat transfer cavity 135 is not connected to the through holes 132, the heat transfer cavity 135 is provided on the part of the support body 131 without through holes 132. The part of the support body 131 without through holes 132 is divided into smaller areas by the multiple through holes 132.

[0047] like Figure 4 and Figure 5 As shown in this embodiment, the heat transfer cavity 135 may include a plurality of heat transfer holes 136, wherein the heat transfer holes 136 are located between two through holes 132. That is, heat transfer holes 136 are provided on the support body 131 between the two through holes 132, and the plurality of heat transfer holes 136 together form the heat transfer cavity 135. The plurality of heat transfer holes 136 may or may not be interconnected. By adding a heat-conducting liquid into each heat transfer hole 136 and sealing it, the support 130 can have good thermal conductivity.

[0048] In one embodiment of this application, the axis of the heat transfer hole 136 is perpendicular to the axis of the through hole 132. Specifically, the axis of the through hole 132 can be set to be perpendicular to the first side surface 133 and the second side surface 134, and the axis of the heat transfer hole 136 can be set to be parallel to the first side surface 133 and the second side surface 134.

[0049] In one embodiment of this application, as Figure 1 and Figure 2 As shown, there are two core packages 120, and the insulating film 110 is rectangular in shape. This is because the core package 120 is generally rectangular, and setting the insulating film 110 to a rectangular shape makes it easier to place the core package 120 inside the insulating film 110. Figure 1 and Figure 2 As shown, the core package 120 is placed after the insulating film 110. The length direction of the core package 120 is consistent with the length direction of the insulating film 110, the width direction of the core package 120 is consistent with the width direction of the insulating film 110, and the height direction of the core package 120 is consistent with the height direction of the insulating film 110. Figure 1 In the middle, the dimensions of the core package 120 and the insulating film 110 in the horizontal direction are their respective widths, and the dimensions of the core package 120 and the insulating film 110 in the vertical direction are their respective heights. Figure 2 In the middle, the dimensions of the core package 120 and the insulating film 110 in the horizontal direction are their respective lengths, and the dimensions of the core package 120 and the insulating film 110 in the vertical direction are their respective heights.

[0050] In this embodiment, the length of the insulating film 110 is slightly longer than the length of the core package 120. The difference between the lengths of the insulating film 110 and the core package 120 can be set to 1 mm to 2 mm. The core package 120 in this embodiment includes two core packages 120, which are arranged adjacent to each other along their width direction. Figure 1 As shown, the width of the insulating film 110 can be set to be slightly larger than the total width of the two core packages 120, wherein the difference between the width of the insulating film 110 and the sum of the widths of the two core packages 120 is 1 mm to 2 mm.

[0051] In one embodiment of this application, the thickness of the insulating film 110 should generally not be set too thick. The thickness of the insulating film 110 can be set to 50 μm to 60 μm.

[0052] In one embodiment of this application, as Figure 1 and Figure 2 As shown, the battery cell also includes a housing 140 and a cover plate 150. The cover plate 150 covers the housing 140 to form a closed space. An insulating film 110 is located inside the housing 140, and a core package 120 and a support 130 are disposed inside the insulating film 110. The core package 120 is connected to the cover plate 150 via a tab 160. After the insulating film 110 is placed inside the housing 140, the top surface of the insulating film 110 is flush with the bottom surface of the cover plate 150.

[0053] In one embodiment of this application, a battery is also provided, which includes the battery cell in any of the above embodiments.

[0054] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0056] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the scope of protection of this application includes the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of this application.

[0057] This document uses specific examples to illustrate the working principle and implementation method of the battery cell and battery of this application. The above description of the embodiments is only for the purpose of helping to understand the specific settings and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation method and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0058] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell, characterized in that, It includes an insulating film and multiple core packages. The insulating film is bag-shaped, with an opening at one end and a receiving cavity communicating with the opening. The multiple core packages are located in the receiving cavity, and a support is provided between two adjacent core packages.

2. The battery cell according to claim 1, characterized in that, The support includes a support body, the support body includes a first side and a second side, and the two core packages adjacent to the support are in contact with the first side and the second side, respectively; The bracket body is provided with multiple through holes, which penetrate the first side and the second side.

3. The battery cell according to claim 2, characterized in that, The through hole can be circular, elliptical, triangular, or quadrilateral in shape.

4. The battery cell according to claim 2, characterized in that, The support body also has a heat transfer cavity inside, which is not connected to the through hole.

5. The battery cell according to claim 4, characterized in that, The heat transfer cavity includes multiple heat transfer holes, which are disposed on the support body between two of the through holes.

6. The battery cell according to claim 5, characterized in that, The axis of the heat transfer cavity is perpendicular to the axis of the through hole.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The number of core packages is two, the insulating film is cuboid in shape, the difference between the length of the insulating film and the length of the core package is 1mm to 2mm, and the difference between the width of the insulating film and the sum of the widths of the two core packages is 1mm to 2mm.

8. The battery cell according to claim 7, characterized in that, The thickness of the insulating film is 50 μm to 60 μm.

9. The battery cell according to claim 1, characterized in that, The battery cell also includes a housing and a cover plate. The cover plate is placed on the housing to form a closed space. The insulating film is located inside the housing. The core package is connected to the cover plate through tabs.

10. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

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