Soft package battery shell, battery and battery pack
By designing an expansion slot on the side of the soft-pack battery shell, the problems of corner damage and insufficient liquid retention during battery cycling are solved, achieving better buffering effect and electrolyte storage, and improving the battery's cycle performance and quality.
Patent Information
- Application Number
- CN202422166417.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-09-04
AI Technical Summary
Soft-pack batteries are prone to corner damage and insufficient liquid retention during the cycle process, affecting the quality of the battery cells.
An expansion slot is designed on the side of the soft-pack battery shell, which protrudes in the direction away from the accommodating cavity to form a buffer zone when the battery expands thermally and increase the electrolyte storage capacity.
The shell tearing phenomenon caused by thickness expansion during battery cycling is improved, and the battery's liquid retention capacity is increased, thereby improving the battery's later cycle performance and quality.
Smart Images
Figure CN223414161U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and in particular to a soft-pack battery shell, a battery and a battery pack. Background Art
[0002] Soft pack battery is a battery that is packaged in a soft aluminum-plastic film. During the production process of soft pack ion battery, the soft pack packaging cells are as follows Figure 1 It can be divided into the main body straight area, the side R corner, and the packaging area; the conventional packaging design basically has an arc-shaped R corner, which is more closely fitted to the core; however, the aluminum-plastic film used in this design is becoming thinner and thinner, and the corners are prone to damage during the expansion of the battery in the later cycles; in addition, the side R corner area fits the battery cell and cannot retain more electrolyte, which is not conducive to the later cycle of the soft-pack battery with a higher liquid retention capacity, and has a very bad impact on the quality of the battery cell; therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be solved. Utility Model Content
[0003] Aiming at the problem that the soft-pack battery shell is prone to corner damage and low liquid retention due to expansion in the later cycle of the battery, the utility model provides a soft-pack battery shell, a battery and a battery pack.
[0004] The technical solutions adopted by the present invention to solve the above technical problems are as follows:
[0005] A first aspect of the present invention provides a soft-pack battery case, which includes a first shell, which is a semi-enclosed shell with an opening, and the first shell has a first accommodating cavity for accommodating a battery cell. The first shell has multiple side surfaces formed around the opening, and at least one of the side surfaces has an expansion groove protruding in a direction away from the first accommodating cavity.
[0006] Optionally, the first shell further includes a flat bottom surface, and the plurality of side surfaces are all arc-shaped surfaces. The plurality of side surfaces are arranged around the flat bottom surface and are connected end to end, and the plurality of side surfaces are respectively transitioned to the flat bottom surface with rounded corners.
[0007] Optionally, expansion slots are formed on multiple side surfaces, and the expansion slots are strip-shaped slots. The expansion slots extend along the side surfaces, and the expansion slots are located on a plane parallel to the flat bottom surface. Multiple expansion slots on the side surfaces are connected end to end to form a ring.
[0008] Optionally, a single or multiple expansion slots are provided on a single side surface, and the cross-section of the expansion slots is arc-shaped or V-shaped. When there are multiple expansion slots on a single side surface, the multiple expansion slots are arranged in parallel and spaced apart to form a structure with a wavy or M-shaped cross-section.
[0009] Optionally, the depth is 0.8-1.0 mm, the width of the expansion slot is 0.8-1.2 mm, and the distance from the expansion slot to the edge of the flat bottom surface is 1-3 mm.
[0010] Optionally, a second shell is included, and the second shell is used to close the opening of the first shell.
[0011] Optionally, a first packaging area is provided on the periphery of the opening end of the first accommodating cavity, a second packaging area is provided on the periphery of the opening end of the second accommodating cavity, and the first shell and the second shell are packaged by the first packaging area and the second packaging area.
[0012] Optionally, a second accommodating cavity is formed on the second shell, and the first accommodating cavity and the second accommodating cavity are connected to form a battery cell accommodating cavity.
[0013] Optionally, the soft-pack battery shell is an aluminum-plastic film shell.
[0014] A second aspect of the present invention provides a soft-pack battery, comprising a battery cell and the soft-pack battery shell described above, wherein the battery cell is placed in the battery cell accommodating cavity.
[0015] A third aspect of the present invention provides a battery pack formed by stacking the soft-pack batteries described above.
[0016] According to the soft-pack battery case, battery and battery pack provided by the utility model, an expansion groove is formed on the side surface protruding in a direction away from the first accommodating cavity. The soft-pack battery will generate thermal expansion during the charging and discharging process. The expansion groove can form an effective buffer zone on the side surface when the battery undergoes thermal expansion, thereby improving the phenomenon of the battery case being torn and damaged on the side surface due to thickness expansion during battery cycling. At the same time, by forming the expansion groove on the side surface, the expansion groove is formed to protrude in a direction away from the first accommodating cavity, and the storage capacity of the electrolyte in the battery case can be increased, so that the liquid retention capacity of the soft-pack battery becomes higher, and the later cycle performance of the soft-pack battery can be improved, thereby improving the quality of the soft-pack battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0018] Figure 1 It is a structural diagram of an existing soft pack battery;
[0019] Figure 2This is a structural schematic diagram of the first shell in the soft-pack battery shell provided by one embodiment of the present utility model;
[0020] Figure 3 This is a structural diagram of the second shell in the soft-pack battery shell provided by one embodiment of the present utility model;
[0021] Figure 4 This is a schematic structural diagram of a soft-pack battery housing provided by one embodiment of the present invention;
[0022] The reference numerals in the drawings of the specification are as follows:
[0023] 1-first shell; 11-first accommodating cavity; 12-opening; 13-side surface; 14-flat bottom surface; 15-expansion slot; 16-first packaging area; 2-second shell; 21-second accommodating cavity; 22-second packaging area; 3-battery cell. DETAILED DESCRIPTION
[0024] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0025] In the description of the present invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.
[0026] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0027] like Figure 1-Figure 2As shown, in one embodiment, the first aspect of the present invention provides a soft-pack battery shell, which includes a first shell 1. The first shell 1 is a semi-enclosed shell with an opening 12. The first shell 1 has a first accommodating cavity 11 for accommodating a battery cell 3. The first shell 1 is formed with multiple side surfaces 13 around the opening 12, and at least one side surface 13 is protruded in a direction away from the first accommodating cavity 11 to form an expansion slot 15.
[0028] Specifically, the present application forms an expansion groove 15 on the side 13 protruding in a direction away from the first accommodating cavity 11. The soft-pack battery will generate thermal expansion during the charging and discharging process. The expansion groove 15 can form an effective buffer zone on the side 13 when the battery expands thermally, thereby improving the phenomenon of the battery shell on the side 13 being torn and damaged due to thickness expansion during battery cycling. At the same time, by forming the expansion groove 15 on the side 13, the expansion groove 15 protrudes in the direction away from the first accommodating cavity 11, and the storage capacity of the electrolyte in the battery shell can be increased, so that the liquid retention capacity of the soft-pack battery becomes higher, which can improve the later cycle performance of the soft-pack battery and improve the quality of the soft-pack battery.
[0029] like Figure 1-Figure 2 As shown, in one embodiment, the first shell 1 further includes a flat bottom surface 14, and the multiple side surfaces 13 are all arc-shaped surfaces. The multiple side surfaces 13 are arranged around the flat bottom surface 14 and are connected end to end, and the multiple side surfaces 13 respectively transition to the flat bottom surface 14 with rounded corners.
[0030] Specifically, the multiple side surfaces 13 are respectively transitioned with the rounded corners of the flat bottom surface 14 to form the side surfaces 13, and the soft-pack battery shell is basically designed to be arc-shaped on the side surfaces 13, so that it fits the winding core more closely; it should be noted that, generally, the arc structure formed on the side of the battery cell 3 has an arc angle of about 90°-150°. By designing the side surfaces 13 to have an arc angle approximately equal to that of the arc structure on the side of the battery cell 3, the two can fit more closely.
[0031] Furthermore, the present application forms an expansion slot 15 on the side 13. The soft-pack battery will generate thermal expansion during the charging and discharging process. The expansion slot 15 can form an effective buffer zone on the side 13 when the battery expands due to thermal expansion, thereby improving the phenomenon of the battery shell on the side 13 being torn and damaged due to thickness expansion during battery cycling. At the same time, by forming the expansion slot 15 on the side 13, the expansion slot 15 is formed to protrude in the direction away from the first accommodating cavity 11, which can also increase the storage capacity of the electrolyte in the battery shell.
[0032] like Figure 1-Figure 2As shown, in one embodiment, expansion slots 15 are formed on the plurality of side surfaces 13 , and the expansion slots 15 are strip-shaped slots. The expansion slots 15 extend along the side surfaces, and the expansion slots 15 are located on a plane parallel to the flat bottom surface 14 . The expansion slots 15 on the plurality of side surfaces 13 are connected end to end to form a ring shape.
[0033] Multiple expansion slots 15 can form a more effective buffer zone on the side 13 when the battery expands due to heat, which can significantly improve the phenomenon of tearing and damage of the battery shell on the side 13 due to thickness expansion during battery cycling. At the same time, by forming multiple expansion slots 15 on multiple side surfaces 13, multiple expansion slots 15 are all located on a plane parallel to the flat bottom surface 14, and the distances between multiple expansion slots 15 and the edge of the flat bottom surface 14 are equal, so that the multiple expansion slots 15 are connected end to end to form a ring, which can significantly increase the storage capacity of the electrolyte in the battery shell, increase the liquid retention capacity of the soft-pack battery, improve the later cycle performance of the soft-pack battery, and improve the quality of the soft-pack battery.
[0034] like Figure 1-Figure 2 As shown, in one embodiment, a single side surface 13 is provided with a single or multiple expansion slots 15, and the cross-section of the expansion slots 15 is arc-shaped or V-shaped. When the number of expansion slots 15 on a single side surface 13 is multiple, the multiple expansion slots 15 are arranged in parallel and spaced apart to form a structure with a wavy or M-shaped cross-section.
[0035] Specifically, when the volume of the battery cell is small, a single expansion slot 15 can be provided on a single side 13, and the cross-section of the expansion slot 15 is arc-shaped or V-shaped. When the volume of the battery cell is large, multiple expansion slots 15 can be provided on a single side 13, and the multiple expansion slots 15 are arranged in parallel and spaced apart to form a structure with a wavy or M-shaped cross-section; by providing a single or multiple expansion slots 15 on a single side 13, the gap between the side 13 and the battery cell 3 can be significantly increased, and more electrolyte can be stored; moreover, the provision of the expansion slot 15 can form a more effective buffer zone on the side 13 when the battery expands due to heat in the later stage, which can significantly improve the phenomenon of tearing and damage of the battery shell on the side 13 due to thickness expansion during battery cycling.
[0036] like Figure 1-Figure 2 As shown, in one embodiment, the depth of the expansion slot 15 is 0.8-1.0 mm, the width of the expansion slot 15 is 0.8-1.2 mm, and the distance from the expansion slot 15 to the edge of the flat bottom surface 14 is 1-3 mm.
[0037] Specifically, the depth of the expansion slot 15 is any point value among 0.8mm, 0.9mm or 1.0mm, or a range value consisting of any two point values. In the specific implementation process, the depth of the expansion slot 15 is determined by the radius of the arc of the expansion slot 15; in a preferred embodiment, the depth of the expansion slot 15 is 0.8mm.
[0038] When the depth of the expansion slot 15 is 0.8 to 1.0 mm, the gap between the side surface 13 and the battery cell 3 can be significantly increased, and more electrolyte can be stored. Moreover, the setting of the expansion slot 15 can form a more effective buffer zone on the side surface 13 when the battery expands due to heat in the later stage, which can significantly improve the phenomenon of tearing and damage of the battery shell on the side surface 13 due to thickness expansion during battery cycle. When the depth of the expansion slot 15 is less than 0.8 mm, more electrolyte cannot be effectively stored. When the depth of the expansion slot 15 is greater than 1.0 mm, the arc vertex will exceed the surface of the battery cell, affecting the thickness and appearance of the battery cell.
[0039] Specifically, the width of the expansion slot 15 is any point value among 0.8mm, 0.9mm, 1.0mm, 1.1mm or 1.2mm, or a range value consisting of any two point values. In the specific implementation process, the width of the expansion slot 15 is a range value consisting of the straight-line distance between the two points connecting the expansion slot 15 and the side surface 13; in a preferred embodiment, the width of the expansion slot 15 is 1.0Mm.
[0040] When the width of the expansion slot 15 is 0.8 to 1.2 mm, the gap between the side 13 and the battery cell 3 can be significantly increased, and more electrolyte can be stored. Moreover, the setting of the expansion slot 15 can form a more effective buffer zone on the side 13 when the battery expands due to heat in the later stage, which can significantly improve the phenomenon of tearing and damage of the battery shell on the side 13 due to thickness expansion during battery cycle. When the width of the expansion slot 15 is less than 0.8 mm, it will not be able to effectively store more electrolyte. When the width of the expansion slot 15 is greater than 1.2 mm, it will cause it to exceed the side.
[0041] Specifically, the distance from the expansion slot 15 to the edge of the flat bottom surface 14 is any point value among 1mm, 1.5mm, 2mm, 2.5mm or 3mm, or a range value consisting of any two point values; in the specific implementation process, the distance from the expansion slot 15 to the edge of the flat bottom surface 14 is a range value consisting of the distance from one end point of the expansion slot 15 close to the flat bottom surface 14 to the flat bottom surface 14; in a preferred embodiment, the distance from the expansion slot 15 to the edge of the flat bottom surface 14 is 2mm.
[0042] When the distance from the expansion slot 15 to the edge of the flat bottom surface 14 is 1 to 3 mm, the gap between the side surface 13 and the battery cell 3 can be significantly increased, and more electrolyte can be stored. Moreover, the setting of the expansion slot 15 can form a more effective buffer zone on the side surface 13 when the battery expands due to heat in the later stage, which can significantly improve the phenomenon of tearing and damage of the battery shell on the side surface 13 due to thickness expansion during battery cycle. When the distance from the expansion slot 15 to the edge of the flat bottom surface 14 is less than 1 mm, the edge of the expansion slot 15 and the flat surface 14 will be significantly squeezed during folding and formation, affecting the appearance and thickness of the battery cell. When the distance from the expansion slot 15 to the edge of the flat bottom surface 14 is greater than 3 mm, the space of the expansion slot 15 will be significantly too small, resulting in the inability to retain the electrolyte.
[0043] like Figure 1-Figure 2 As shown, in one embodiment, a second shell 2 is included, which is used to close the opening 12 of the first shell 1, so that a closed cavity is formed between the second shell 2 and the first shell 1 for enclosing the battery cell 3 of the soft-pack battery.
[0044] like Figure 1-Figure 2 As shown, in one embodiment, a first packaging area 14 is provided on the periphery of the opening end of the first accommodating cavity 11, and a second packaging area 22 is provided on the periphery of the opening end of the second accommodating cavity 21. The first shell 1 and the second shell 2 are packaged by the first packaging area 14 and the second packaging area 22.
[0045] Specifically, the edge of the first packaging area 14 of the first shell 1 and the edge of the second packaging area 22 of the second shell 2 are sealed and connected to each other through a heat sealing process to form a packaging area.
[0046] like Figure 1-Figure 2 As shown, in one embodiment, a second shell 2 is included, a second accommodating cavity 21 is formed on the second shell 2, and the opening end of the first accommodating cavity 11 and the opening end of the second accommodating cavity 21 are arranged opposite to each other to form a battery cell accommodating cavity.
[0047] Specifically, the opening end of the first accommodating cavity 11 and the opening end of the second accommodating cavity 21 are arranged opposite to each other to form a battery cell accommodating cavity. The battery cell accommodating cavity is a closed structure and is used to enclose the battery cell 3 of the soft-pack battery.
[0048] Furthermore, the second housing 2 is formed with a plurality of side surfaces 13 surrounding the second accommodating cavity 21 , and an expansion slot 15 is formed on at least one of the side surfaces 13 , protruding in a direction away from the second accommodating cavity 21 .
[0049] Specifically, the present application forms an expansion groove 15 on the side 13 protruding in a direction away from the second accommodating cavity 21. The soft-pack battery will generate thermal expansion during the charging and discharging process. The expansion groove 15 can form an effective buffer zone on the side 13 when the battery expands thermally, thereby improving the phenomenon of the battery shell on the side 13 being torn and damaged due to thickness expansion during battery cycling. At the same time, by forming the expansion groove 15 on the side 13, the expansion groove 15 protrudes in the direction away from the second accommodating cavity 21, and the storage capacity of the electrolyte in the battery shell can be increased, so that the liquid retention capacity of the soft-pack battery becomes higher, which can improve the later cycle performance of the soft-pack battery and improve the quality of the soft-pack battery.
[0050] like Figure 1-Figure 2 As shown, in one embodiment, the soft-pack battery housing is an aluminum-plastic film housing.
[0051] The soft pack battery shell uses an aluminum-plastic film shell as the shell. After assembly, the single cell 3 is sealed in the aluminum-plastic film to form a battery. The aluminum-plastic film plays a role in protecting the internal electrodes and isolating them from the external environment.
[0052] A second aspect of the present invention provides a soft-pack battery, comprising a battery cell 3 and the above-mentioned soft-pack battery shell, wherein the battery cell 3 is placed in a battery cell accommodating cavity.
[0053] The battery cell 3 of the soft-pack battery of the present application is placed in the battery cell accommodating cavity formed by the first accommodating cavity 11 and the second accommodating cavity 21. An expansion slot 15 is formed on the battery shell of the soft-pack battery of the present application. The soft-pack battery will generate thermal expansion during the charging and discharging process. The expansion slot 15 can form an effective buffer zone on the side 13 when the battery expands thermally, thereby improving the phenomenon of tearing and damage of the battery shell on the side 13 due to thickness expansion during battery cycle. At the same time, by forming the expansion slot 15 on the side 13, the expansion slot 15 protrudes in the direction away from the first accommodating cavity 11, and the storage capacity of the electrolyte in the battery shell can also be increased.
[0054] A third aspect of the present invention provides a battery pack formed by stacking the above-mentioned soft-pack batteries.
[0055] In the present invention, after the soft-pack batteries are stacked into a battery pack, the expansion slots 15 on the soft-pack batteries can form an effective buffer zone on the side 13 when the battery expands due to heat, thereby improving the phenomenon of tearing and damage of the battery shell on the side 13 due to thickness expansion during battery cycling. At the same time, the expansion slots 15 can also increase the storage capacity of the electrolyte in the battery shell, thereby increasing the liquid retention capacity of the soft-pack batteries, thereby improving the later cycle performance of the soft-pack batteries and improving the quality of the soft-pack batteries.
[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A soft pack battery housing, characterized in that: The soft-pack battery shell includes a first shell, which is a semi-enclosed shell with an opening. The first shell has a first accommodating cavity for accommodating the battery cell. The first shell has multiple side surfaces formed around the opening, and at least one of the side surfaces protrudes in a direction away from the first accommodating cavity to form an expansion groove.
2. The soft pack battery case according to claim 1, wherein: The first shell further includes a flat bottom surface, and the plurality of side surfaces are all arc-shaped surfaces. The plurality of side surfaces are arranged around the flat bottom surface and are connected end to end. The plurality of side surfaces are respectively transitioned to the flat bottom surface with rounded corners.
3. The soft pack battery case according to claim 2, characterized in that: Expansion slots are formed on the plurality of side surfaces. The expansion slots are strip-shaped slots that extend along the side surfaces and are located on a plane parallel to the flat bottom surface. The expansion slots on the plurality of side surfaces are connected end to end to form a ring.
4. The soft pack battery case according to claim 3, wherein: A single side surface is provided with a single or multiple expansion slots, and the cross-section of the expansion slots is arc-shaped or V-shaped. When there are multiple expansion slots on a single side surface, the multiple expansion slots are arranged in parallel and spaced apart to form a structure with a wavy or M-shaped cross-section.
5. The soft pack battery case according to claim 2, wherein: The depth of the expansion slot is 0.8-1.0 mm, the width of the expansion slot is 0.8-1.2 mm, and the distance from the expansion slot to the edge of the flat bottom surface is 1-3 mm.
6. The soft pack battery case according to claim 1, wherein: A second shell is included, and the second shell is used to close the opening of the first shell.
7. The soft pack battery case according to claim 6, characterized in that: A second accommodating cavity is formed on the second shell, and the first accommodating cavity and the second accommodating cavity are connected to form a battery cell accommodating cavity.
8. The soft pack battery case according to claim 7, characterized in that: A first packaging area is provided on the periphery of the opening end of the first accommodating cavity, a second packaging area is provided on the periphery of the opening end of the second accommodating cavity, and the first shell and the second shell are packaged by the first packaging area and the second packaging area.
9. The soft pack battery case according to claim 6, characterized in that: The soft-pack battery shell is an aluminum-plastic film shell.
10. A soft pack battery, characterized in that: It comprises a battery cell and a soft-pack battery shell according to any one of claims 1 to 9, wherein the battery cell is placed in the battery cell accommodating cavity.
11. A battery pack, characterized in that: The soft-pack battery according to claim 10 is stacked.