Pouch battery and electric device using the same

Abstract

The utility model relates to the technical field of energy storage appliance discloses a kind of soft package battery and electric device, including electric core and plastic envelope electric core plastic envelope piece, plastic envelope piece forms surrounding body part, side edge and top edge;Surrounding body part completely covers electric core, and surrounding body part has opposite first side and second side;Side edge includes opposite first side edge edge part and second side edge edge part, and first side edge edge part is bent and pasted on first side, and second side edge edge part is bent and pasted on second side;The end of first side edge edge part away from top edge, and the end of second side edge edge part away from top edge, all have exceeding end portion;Exceeding end portion exceeds the first end portion of surrounding body part, and end portion is bent to the end surface of surrounding body part;The outer terminal of tab is from top edge and is out of plastic envelope piece.The soft package battery and electric device of the utility model can further reduce the overall size of soft package battery, and be conducive to improving the energy density of soft package battery.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, and in particular to a soft-pack battery and power supply device. Background Technology

[0002] Due to the lightweight nature of its aluminum-plastic film material, pouch batteries are increasingly being used in the automotive and energy storage industries. Aluminum-plastic film encapsulation is a crucial step in pouch battery production. It involves placing the battery cell inside the plastic encapsulation film and then using a sealing head to press the opening of the film to seal it, creating a sealed edge at the opening.

[0003] Current pouch batteries consist of a cell and a molding compound. The molding compound completely surrounds the cell through a molding process. After the molding process, the size of the molded part of the molding compound will further increase, which will affect the overall size of the pouch cell. This is not conducive to reducing the overall volume of the pouch battery, nor is it conducive to improving the energy density of the pouch battery.

[0004] In view of this, there is a need to design a pouch battery and power device that can further reduce the overall size of the pouch battery and improve its energy density.

[0005] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0006] This invention provides a pouch battery and an electrical device that can further reduce the overall size of the pouch battery and improve its energy density.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A pouch battery includes a cell and a molding compound surrounding the cell, the molding compound forming an enclosure surrounding a body portion, side seals, and a top seal.

[0009] The enclosing body completely covers the battery cell, and the enclosing body has a first side and a second side opposite to each other.

[0010] The side sealing edge includes a first side edge attaching portion and a second side edge attaching portion, wherein the first side edge attaching portion is bent and attached to the first side surface, and the second side edge attaching portion is bent and attached to the second side surface;

[0011] The first side edge portion away from the top sealing edge and the second side edge portion away from the top sealing edge both have an extended end; the extended end extends beyond the first end of the surrounding body portion and bends toward the end face of the surrounding body portion;

[0012] The battery cell has a tab connected to its top end away from the first end, and the outer end of the tab extends out of the plastic seal from the top sealing edge.

[0013] Optionally, the angle between the extended end and the first end of the surrounding body portion is α, where 0° < α ≤ 90°.

[0014] Optionally, the angle between the extended end and the first end of the surrounding body is α, where 0° < α < 90°, and a filler block is provided between the extended end and the first end of the surrounding body.

[0015] Optionally, an adhesive layer is applied to the first side edge, the second side edge, and the extended end.

[0016] The first side edge is attached to the first side surface via the adhesive layer, the second side edge is attached to the second side surface via the adhesive layer, and the protruding end is attached to the end face of the first end via the adhesive layer.

[0017] Optionally, the unsealed sealed component includes a first aluminum-plastic composite film portion and a second aluminum-plastic composite film portion that are sealed together.

[0018] The first aluminum-plastic composite film portion includes a stamped first encapsulation groove and first folded edges located on opposite sides of the first encapsulation groove; the second aluminum-plastic composite film portion includes a stamped second encapsulation groove and second folded edges located on opposite sides of the second encapsulation groove.

[0019] One first folded edge portion and one second folded edge portion are plastic-sealed together to form the first side edge portion, and another first folded edge portion and another second folded edge portion are plastic-sealed together to form the second side edge portion.

[0020] Optionally, the first aluminum-plastic composite film portion and the second aluminum-plastic composite film portion are connected by a crease line, and the bending angle of the first aluminum-plastic composite film portion and the second aluminum-plastic composite film portion can be adjusted around the crease line;

[0021] When the top surfaces of the first aluminum-plastic composite film portion and the second aluminum-plastic composite film portion are on the same plane, the crease line separates the first encapsulation groove and the second encapsulation groove, and the distance between the first encapsulation groove and the second encapsulation groove is not greater than 2mm.

[0022] Optionally, the portion of the molding compound with the crease line located between the first encapsulation groove and the second encapsulation groove is stretched.

[0023] Optionally, the depths of the first encapsulation groove and the second encapsulation groove are different.

[0024] Optionally, the width of both the first side edge and the second side edge is not less than 4mm.

[0025] An electrical device includes a pouch battery as described in any of the preceding claims.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The soft-pack battery and power device provided by this utility model can effectively reduce the overall width and length of the soft-pack battery by first bending and attaching the first side edge to the first side, bending and attaching the second side edge to the second side, and bending the first side edge and the second side edge to the end face of the extended end towards the first end during the plastic sealing process. This is beneficial to improving the energy density of the soft-pack battery.

[0028] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a front view of the soft-pack battery provided in this embodiment of the present invention when the extended end is not bent;

[0031] Figure 2 yes Figure 1 Enlarged schematic diagram of the pouch cell at position A;

[0032] Figure 3 This is a three-dimensional schematic diagram of the soft-pack battery provided in this embodiment of the present invention when the extended end is not bent;

[0033] Figure 4 This is a front view of the soft-pack battery provided in this embodiment of the present invention when it is bent 90° beyond the end;

[0034] Figure 5 yes Figure 4 Enlarged schematic diagram of the pouch cell at position B;

[0035] Figure 6This is a front view of the soft-pack battery provided in this embodiment of the present invention when it is bent at 45° beyond the end;

[0036] Figure 7 yes Figure 6 Enlarged schematic diagram of the pouch cell at position C;

[0037] Figure 8 This is a three-dimensional schematic diagram of the soft-pack battery provided in this embodiment of the present invention when it is bent beyond the end;

[0038] Figure 9 This is a top view of the first aluminum-plastic composite film portion and the second aluminum-plastic composite film portion in the molding compound provided in this embodiment of the utility model, with their top surfaces flush.

[0039] Figure 10 yes Figure 9 Side view of the middle structure;

[0040] Figure 11 yes Figure 9 A schematic diagram of the structure of the first aluminum-plastic composite film and the second aluminum-plastic composite film when they are bent and folded together and not sealed.

[0041] Reference numerals: 1. Molded part; 101. Extended end; 11. Surrounding body part; 12. First side edge; 13. Second side edge; 14. Top sealing edge; 2. Tab; 3. First aluminum-plastic composite film part; 31. First encapsulation groove; 32. First folded edge; 40. Crease line; 4. Second aluminum-plastic composite film part; 41. Second encapsulation groove; 42. Second folded edge. Detailed Implementation

[0042] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0043] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0044] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0045] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0046] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0047] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0048] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0049] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0050] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] Example 1

[0052] In view of the aforementioned defects in existing pouch batteries, the applicant, based on years of extensive practical experience and professional knowledge in the design and manufacture of such products, and in conjunction with theoretical application, actively conducted research and innovation in order to create a solution that overcomes the defects in the existing technology and makes pouch batteries more practical. After continuous research, design, and repeated prototype production and improvements, this utility model with real practical value has finally been created.

[0053] Please refer to Figures 1 to 11 This utility model provides a soft-pack battery, including a battery cell and a plastic encapsulation component 1 that encapsulates the battery cell.

[0054] The molding compound 1 surrounds the body portion 11, side seals, and top seal 14. The molding compound 1 has undergone the molding process and completely encapsulates the battery cell, thus providing excellent protection for the battery cell. The side seals keep the opposite sides of the body portion 11 closed, and the top seal 14 keeps the top of the body portion 11 closed, thereby completely encapsulating the battery cell.

[0055] The body portion 11 has opposing first and second sides. The side sealing edges include opposing first side-attachment portions 12 and 13. The first side-attachment portion 12 is bent and attached to the first side, and the second side-attachment portion 13 is bent and attached to the second side, which effectively reduces the overall width of the pouch battery. Both the first side-attachment portion 12 and the second side-attachment portion 13 are formed during the molding process.

[0056] The first side edge 12, at one end away from the top sealing edge 14, and the second side edge 13, at one end away from the top sealing edge 14, both have an extended end 101. The extended end 101 extends beyond the first end of the body portion 11 and bends towards the end face of the body portion 11. The bending of the extended end 101 will make the extended end 101 fit as close as possible to the end face of the first end, thereby shortening the overall length of the pouch battery. This will effectively reduce the overall length of the pouch battery, reduce the volume of the installation space occupied by the pouch battery, and increase the energy density of the pouch battery. A tab 2 is connected to the top end of the cell away from the first end, and the outer end of the tab 2 extends out of the plastic seal 1 from the top sealing edge 14.

[0057] It should also be noted that by fitting the end face of the first end as closely as possible to the end of the extended end 101, it is possible to avoid the extended end 101 contacting other pouch batteries and reduce the possibility of the extended end 101 puncturing the plastic seal 1 of other batteries.

[0058] Optionally, the angle between the extended end 101 and the first end of the surrounding body portion 11 is α, where 0° < α ≤ 90°. When the angle between the extended end 101 and the first end of the surrounding body portion 11 is 90°, the extended end 101 adheres to the end face of the first end, thereby minimizing the overall length of the pouch battery.

[0059] Optionally, the angle between the protruding end 101 and the first end surrounding the body portion 11 is α, where 0° < α < 90°. The larger the angle α, the closer the protruding end 101 is to the first end, thus shortening the overall length of the pouch battery, better reducing the volume of the installation space occupied by the pouch battery, and increasing the energy density of the pouch battery. A filler block is provided between the protruding end 101 and the first end surrounding the body portion 11. It should be noted that the filler block can be used to maintain the angle α between the protruding end 101 and the first end surrounding the body portion 11, preventing the protruding end 101 from being crushed. It should also be noted that when the angle α between the protruding end 101 and the first end surrounding the body portion 11 is close to 90°, the bent protruding end 101 can easily pull on the surrounding body portion 11, causing slight deformation of the surrounding body portion 11. Therefore, in a preferred embodiment, the filler block maintains the angle α between the protruding end 101 and the first end surrounding the body portion 11, thereby preventing deformation of the surrounding body portion 11. The filler block can be triangular prism-shaped, with one surface conforming to the end face of the first end and the other surface conforming to the end beyond 101. Preferably, the filler block is a flexible block. It is conceivable that the filler block can also be other shapes, such as a columnar structure with a circular cross-section, a columnar structure with a semi-circular cross-section, or a columnar structure with a trapezoidal cross-section, etc.

[0060] Optionally, a tab 2 is connected to the top portion of the battery cell away from the first end; the tab 2 includes a positive tab and a negative tab arranged at intervals, both of which are connected to the top portion of the battery cell. The tab 2 is sealed and surrounded by a top sealing edge 14.

[0061] Optionally, an adhesive layer is applied to the first side-mounted portion 12, the second side-mounted portion 13, and the extended end portion 101. The first side-mounted portion 12 is attached to the first side surface via the adhesive layer, the second side-mounted portion 13 is attached to the second side surface via the adhesive layer, and the extended end portion 101 is attached to the end face of the first end portion via the adhesive layer. The adhesive layer improves the stability of the first side-mounted portion 12, the second side-mounted portion 13, and the extended end portion 101 in the surrounding body portion 11, thereby improving the overall dimensional stability of the pouch battery.

[0062] Optionally, the unsealed encapsulated component 1 includes a first aluminum-plastic composite film portion 3 and a second aluminum-plastic composite film portion 4 that are encapsulated together; the first aluminum-plastic composite film portion 3 includes a stamped first encapsulation groove 31 and first folded edges 32 located on opposite sides of the first encapsulation groove 31; the second aluminum-plastic composite film portion 4 includes a stamped second encapsulation groove 41 and second folded edges 42 located on opposite sides of the second encapsulation groove 41; the first encapsulation groove 31 and the second encapsulation groove 41 together accommodate a battery cell.

[0063] In this design, a first folded edge portion 32 and a second folded edge portion 42 are plastic-encapsulated together to form a first side edge portion 12, and another first folded edge portion 32 and another second folded edge portion 42 are plastic-encapsulated together to form a second side edge portion 13. The overlapping and plastic-encapsulation of one first folded edge portion 32 and one second folded edge portion 42, and the overlapping and plastic-encapsulation of the other first folded edge portion 32 and the other second folded edge portion 42, ensures that the body portion 11 remains in a state of surrounding the battery cell, thereby improving the sealing effect of the battery cell.

[0064] Optionally, the first aluminum-plastic composite film portion 3 and the second aluminum-plastic composite film portion 4 are connected by a crease line 40. That is, the first aluminum-plastic composite film portion 3 and the second aluminum-plastic composite film portion 4 are actually different parts of the same aluminum-plastic film. The bending angle of the first aluminum-plastic composite film portion 3 and the second aluminum-plastic composite film portion 4 can be adjusted around the crease line 40. The relative position of the first aluminum-plastic composite film portion 3 and the second aluminum-plastic composite film portion 4 can be changed by the crease line 40, so that the top surfaces of the first aluminum-plastic composite film portion 3 and the second aluminum-plastic composite film portion 4 are on the same plane, or the first aluminum-plastic composite film portion 3 and the second aluminum-plastic composite film portion 4 can be superimposed to form a receiving cavity for accommodating the battery cell. The receiving cavity is composed of a first encapsulation groove 31 and a second encapsulation groove 41.

[0065] When the top surfaces of the first aluminum-plastic composite film portion 3 and the second aluminum-plastic composite film portion 4 are on the same plane, the crease line 40 separates the first encapsulation groove 31 and the second encapsulation groove 41, and the distance between the first encapsulation groove 31 and the second encapsulation groove 41 is no greater than 2mm. It should be noted that the bottom end of the molding compound 1 is formed by the area where the crease line 40 is located, and there is no dividing seam at the bottom end of the molding compound 1, improving the reliability of the bottom seal of the soft-pack battery. It should also be noted that the distance between the first encapsulation groove 31 and the second encapsulation groove 41 is no greater than 2mm, which can reduce the bulge at the bottom end of the molding compound 1 and avoid the formation of an extended portion of the molding compound.

[0066] Optionally, on the molding compound 1, the portion with the crease line 40 located between the first encapsulation groove 31 and the second encapsulation groove 41 is tightened, thereby making the bottom end of the molding compound 1 flatter, so that the protruding end 101 can be more smoothly attached to the end face of the first end. It should also be noted that, with the portion with the crease line 40 located between the first encapsulation groove 31 and the second encapsulation groove 41 tightened, the molding extension formed at the first end during the molding process is less or even non-existent.

[0067] Optionally, such as Figures 9 to 11 As shown, the depths of the first encapsulation groove 31 and the second encapsulation groove 41 are different. Specifically, the depths of the first encapsulation groove 31 and the second encapsulation groove 41 can be set according to the thickness of the battery cell.

[0068] Optionally, such as Figure 8 As shown, the molding compound 1 has a top sealing edge 14; the top sealing edge 14 seals the tab 2, specifically, the tab 2 is covered with tab adhesive, and the tab 2 and the top sealing edge 14 are sealed together by the tab adhesive. The top sealing edge 14 is connected to the second end of the body portion 11. The bottom end of the body portion 11 is the first end, and the top end is the second end.

[0069] Optionally, the width of both the first side-mounted edge portion 12 and the second side-mounted edge portion 13 is not less than 4mm to ensure the sealing effect on the battery cell.

[0070] Example 2

[0071] This embodiment discloses an electrical device including a pouch battery as described in any of the preceding embodiments.

[0072] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A pouch battery, comprising a battery cell and a plastic encapsulation surrounding the battery cell, characterized in that: The molding compound forms an enclosure around the body, side seals, and top seal; The enclosing body completely covers the battery cell, and the enclosing body has a first side and a second side opposite to each other. The side sealing edge includes a first side edge attaching portion and a second side edge attaching portion, wherein the first side edge attaching portion is bent and attached to the first side surface, and the second side edge attaching portion is bent and attached to the second side surface; The first side edge portion away from the top sealing edge and the second side edge portion away from the top sealing edge both have an extended end; the extended end extends beyond the first end of the surrounding body portion and bends toward the end face of the surrounding body portion; The battery cell has a tab connected to its top end away from the first end, and the outer end of the tab extends out of the plastic seal from the top sealing edge.

2. The pouch battery of claim 1, wherein, The angle between the extended end and the first end of the surrounding body is α, where 0° < α ≤ 90°.

3. The soft-pack battery according to claim 2, characterized in that, The angle between the extended end and the first end of the surrounding body is α, where 0° < α < 90°, and a filling block is provided between the extended end and the first end of the surrounding body. 4.The pouch battery of claim 1, wherein, An adhesive layer is applied to the first side edge, the second side edge, and the extended end. The first side edge is attached to the first side surface via the adhesive layer, the second side edge is attached to the second side surface via the adhesive layer, and the protruding end is attached to the end face of the first end via the adhesive layer. 5.The pouch battery of claim 1, wherein, The unsealed molded part includes a first aluminum-plastic composite film portion and a second aluminum-plastic composite film portion that are molded together; The first aluminum-plastic composite film portion includes a stamped first encapsulation groove and first folded edges located on opposite sides of the first encapsulation groove; the second aluminum-plastic composite film portion includes a stamped second encapsulation groove and second folded edges located on opposite sides of the second encapsulation groove. One first folded edge portion and one second folded edge portion are plastic-sealed together to form the first side edge portion, and another first folded edge portion and another second folded edge portion are plastic-sealed together to form the second side edge portion.

6. The pouch battery of claim 5, wherein, The first aluminum-plastic composite film portion and the second aluminum-plastic composite film portion are connected by a crease line, and the bending angle of the first aluminum-plastic composite film portion and the second aluminum-plastic composite film portion can be adjusted around the crease line; When the top surfaces of the first aluminum-plastic composite film portion and the second aluminum-plastic composite film portion are on the same plane, the crease line separates the first encapsulation groove and the second encapsulation groove, and the distance between the first encapsulation groove and the second encapsulation groove is not greater than 2mm.

7. The soft-pack battery according to claim 6, characterized in that, On the plastic encapsulation component, the portion with the crease line located between the first encapsulation groove and the second encapsulation groove is tightened.

8. The soft-pack battery according to claim 5, characterized in that, The first encapsulation groove and the second encapsulation groove have different depths.

9. The soft-pack battery according to claim 1, characterized in that, The width of both the first side edge and the second side edge is not less than 4mm.

10. An electrical appliance, characterized in that, It includes a pouch cell battery as described in any one of claims 1 to 9.

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