Side seal head for packaging soft package battery

Abstract

The utility model provides a side seal head for packaging a soft package battery, which comprises a base part and a packaging part, and the base part is arranged along a first direction; the packaging part comprises a packaging surface extending along a second direction, and the second direction is intersected with the first direction; the terminal, extending along the second direction, of the packaging surface is connected with the surface of the base part; the packaging surface is a plane; along the length direction of the packaging surface, the packaging surface is divided into a first part, a slope transition part and a second part which are connected in sequence; the width of the first part and the width of the second part are fixed, and the width of the first part is smaller than that of the second part; one end of the slope transition part is smoothly connected with the first part, and the other end of the slope transition part is smoothly connected with the second part. When the side sealing head is used for side sealing, the size of a liquid injection opening can be increased, and electrolyte can enter a roll core easily.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packaging, and relates to a side sealing head used for soft-pack battery packaging. Background Art

[0002] Soft-pack batteries include lithium-ion soft-pack batteries, etc., and their packaging mainly includes top sealing, side sealing, and vacuum packaging after formation. In the traditional packaging process, the three types of heads are designed with the same head width, especially side sealing and vacuum packaging after formation. For soft-pack batteries with a larger cell width, the side sealing position is 90° to the edge sealing position after the aluminum-plastic film is folded in half, that is, the edge sealing position after the aluminum-plastic film is folded in half is the top sealing position, and the side sealing has no effect on the injection port.

[0003] However, for mini soft-pack batteries with a smaller width, due to the limitations of the pocket bag design and practical problems, the edge sealing position after the aluminum-plastic film is folded in half is the side sealing position, and the side sealing position and the side of the air bag need to be packaged simultaneously. According to the conventional head design, affected by the size of the battery cell, the air bag has a significantly reduced injection port due to the width of the head and heat radiation problems, and the aluminum-plastic film between the bottom of the battery cell and the air bag will be adhered due to heat radiation, resulting in the electrolyte being unable or difficult to enter the roll core during injection, affecting production efficiency and causing electrolyte contamination of the battery cell, etc. Therefore, it is urgent to provide a solution to solve the above problems. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a side sealing head for soft-pack battery packaging. The side sealing head provided by the present invention has a packaging surface with an asymmetric width design. For narrower micro soft-pack batteries, the second part of the packaging surface with a larger width can be used to seal the battery body, and the first part with a smaller width can be used to seal the airbag. This can increase the size of the injection port, which is beneficial for injection, and does not affect the effective sealing width of the side seal at the battery body position; it can also reduce the heat radiation between the bottom of the battery body and the airbag, reduce adhesion, and facilitate the electrolyte to enter the winding core; it can also increase the space for accommodating the electrolyte, avoid electrolyte contamination of the battery cell, and improve production yield.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a side sealing head for soft-pack battery packaging, the side sealing head comprising a base and a packaging part, the base is arranged along a first direction; the packaging part comprises a packaging surface extending along a second direction, the second direction intersects with the first direction; the terminal end of the packaging surface extending along the second direction is connected to the surface of the base;

[0007] The packaging surface is a plane; along the length direction of the packaging surface, the packaging surface is divided into a first part, a slope transition part and a second part which are connected in sequence; the width of the first part and the width of the second part are both fixed, and the width of the first part is smaller than the width of the second part;

[0008] One end of the slope transition portion is smoothly connected to the first portion, and the other end is smoothly connected to the second portion.

[0009] The side sealing head for soft pack battery packaging provided by the utility model has the following advantages:

[0010] (1) The packaging surface of the side sealing head is divided into a first part, a slope transition part and a second part which are connected in sequence. The width of the first part is smaller than the width of the second part. The advantages of this asymmetric width design are as follows: ① For narrower micro soft-pack batteries, the second part of the packaging surface with a larger width can be used to seal the battery body, and the first part with a smaller width can be used to seal the air bag. This can increase the size of the injection port, which is conducive to injection, and does not affect the effective sealing width of the side seal at the battery body; ② The asymmetric width design can reduce the heat radiation between the bottom of the battery body and the air bag, reduce adhesion, and facilitate the electrolyte to enter the winding core; ③ For micro soft-pack batteries, the asymmetric width design can increase the space for accommodating the electrolyte, avoid electrolyte contamination of the battery cell, and improve production yield;

[0011] (2) The slope transition portion is smoothly connected to both the first portion and the second portion, which can reduce the generation of packaging dead corners, avoid electrolyte retention in the dead corners, and ensure the performance of the battery cell.

[0012] Preferably, the ratio of the width of the first portion to the width of the second portion is 1:(1.5-4).

[0013] Preferably, the ratio of the length of the first part to the length of the second part is (0.8-2):1.

[0014] Preferably, along the direction from the first portion to the second portion, the width of the slope transition portion gradually increases.

[0015] Preferably, the slope transition portion is in the shape of a right-angled trapezoid.

[0016] Preferably, the right-angled trapezoid has a top side and a bottom side that are arranged oppositely, and a hypotenuse and a right-angle side that are arranged oppositely;

[0017] The width of the top edge is the same as the width of the first portion, and the top edge is connected to the first portion; the width of the bottom edge is the same as the width of the second portion, and the bottom edge is connected to the second portion.

[0018] Preferably, the hypotenuse is smoothly connected to a long side of the first part through a first arc segment.

[0019] Preferably, the oblique edge is smoothly connected to a long side of the second portion via a second arc segment.

[0020] Preferably, the angle between the hypotenuse and the length direction of the packaging surface is 15°-75°.

[0021] Preferably, the packaging portion is formed by extending the packaging surface along the second direction; and one side surface of the packaging portion is a Z-shaped curved surface.

[0022] Preferably, the base comprises a long plate and a short plate, and the long plate and the short plate are vertically connected to form an L-shaped structure; a side surface of the short plate away from the long plate is connected to a terminal extending along the second direction of the packaging surface.

[0023] Preferably, the long plate is provided with through holes.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The side sealing head for soft pack battery packaging provided by the utility model has the following advantages:

[0026] (1) The packaging surface of the side sealing head is divided into a first part, a slope transition part and a second part which are connected in sequence. The width of the first part is smaller than the width of the second part. The advantages of this asymmetric width design are as follows: ① For narrower micro soft-pack batteries, the second part of the packaging surface with a larger width can be used to seal the battery body, and the first part with a smaller width can be used to seal the air bag. This can increase the size of the injection port, which is conducive to injection, and does not affect the effective sealing width of the side seal at the battery body; ② The asymmetric width design can reduce the heat radiation between the bottom of the battery body and the air bag, reduce adhesion, and facilitate the electrolyte to enter the winding core; ③ For micro soft-pack batteries, the asymmetric width design can increase the space for accommodating the electrolyte, avoid electrolyte contamination of the battery cell, and improve production yield;

[0027] (2) The slope transition portion is smoothly connected to both the first portion and the second portion, which can reduce the generation of packaging dead corners, avoid electrolyte retention in the dead corners, and ensure the performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a side sealing head provided for a specific embodiment of the utility model;

[0029] Figure 2 A schematic diagram of a process for packaging a micro soft-pack battery provided in a specific embodiment of the utility model;

[0030] Figure 3 A schematic diagram of soft-pack battery packaging provided in a specific embodiment of the utility model;

[0031] Among them, 1-packaging part; 2-base; 3-packaging surface; 4-first arc segment; 5-second arc segment; 6-battery cell body; 7-air bag. DETAILED DESCRIPTION

[0032] It should be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc., are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of such features.

[0033] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0035] In a specific embodiment, the utility model provides a side sealing head for soft pack battery packaging, such as Figure 1 As shown, the side sealing head comprises a base 2 and a packaging part 1, wherein the base 2 is arranged along a first direction; the packaging part 1 comprises a packaging surface 3 extending along a second direction, wherein the second direction intersects with the first direction; and a terminal end of the packaging surface 3 extending along the second direction is connected to a surface of the base 2;

[0036] The packaging surface 3 is a plane; along the length direction of the packaging surface 3, the packaging surface 3 is divided into a first part, a slope transition part and a second part which are connected in sequence; the width of the first part and the width of the second part are both fixed, and the width of the first part is smaller than the width of the second part;

[0037] One end of the slope transition portion is smoothly connected to the first portion, and the other end is smoothly connected to the second portion.

[0038] The side sealing head for soft pack battery packaging provided by the utility model has the following advantages:

[0039] (1) The sealing surface 3 of the side sealing head is divided into a first part, a slope transition part and a second part which are connected in sequence. The width of the first part is smaller than the width of the second part. The advantages of this asymmetric width design are as follows: ① For narrower micro soft-pack batteries, such as Figure 3 As shown, the second part of the packaging surface 3 with a larger width can be used to seal the side of the battery body 6, and the first part with a smaller width can be used to seal the side of the air bag 7, which can increase the size of the injection port, which is conducive to injection, and does not affect the effective sealing width of the side seal at the position of the battery body 6; ② The asymmetric width design can reduce the heat radiation between the bottom of the battery body 6 and the air bag 7, reduce adhesion, and facilitate the electrolyte to enter the winding core; ③ For micro soft-pack batteries, the asymmetric width design can increase the space for accommodating electrolyte, avoid electrolyte contamination of the battery cell, and improve production yield;

[0040] (2) The slope transition portion is smoothly connected to both the first portion and the second portion, which can reduce the generation of packaging dead corners, avoid electrolyte retention in the dead corners, and ensure the performance of the battery cell.

[0041] If the slope transition part is not smoothly connected to the first part and the second part, but the edges are directly connected, it is easy to form a dead corner due to the influence of heat radiation, and part of the electrolyte will be retained in the dead corner. Since the amount of liquid injected into the micro battery is small, it is easy to cause abnormal performance of the battery cell.

[0042] In summary, the side sealing head of the utility model is suitable for packaging of micro soft-pack batteries, especially for packaging of narrow micro soft-pack batteries.

[0043] It should be noted that when the side sealing head provided by the utility model is used for side sealing, there are generally two side sealing heads symmetrically arranged up and down.

[0044] Further, a ratio of a width of the first portion to a width of the second portion is 1:(1.5-4), for example, it may be 1:1.5, 1:1.8, 1:2, 1:2.5, 1:3, 1:3.5 or 1:4, etc.

[0045] In the utility model, when the width ratio of the first part to the second part is 1:(1.5-4), the side sealing effect at the first part can be ensured, and the injection port can be made larger, which is conducive to injection.

[0046] Further, the ratio of the length of the first part to the length of the second part is (0.8-2):1, for example, it can be 0.8:1, 1:1, 1.2:1, 1.5:1, 1.8:1 or 2:1, etc.

[0047] Furthermore, along the direction from the first portion to the second portion, the width of the slope transition portion gradually increases.

[0048] Furthermore, the shape of the slope transition portion is a right-angled trapezoid.

[0049] Further, the right-angled trapezoid has a top side and a bottom side that are arranged oppositely, and a hypotenuse and a right-angle side that are arranged oppositely;

[0050] The width of the top edge is the same as the width of the first portion, and the top edge is connected to the first portion; the width of the bottom edge is the same as the width of the second portion, and the bottom edge is connected to the second portion.

[0051] Furthermore, the oblique edge is smoothly connected to a long side of the first part through a first arc segment 4 .

[0052] Furthermore, the oblique edge is smoothly connected to a long side of the second portion through a second arc segment 5 .

[0053] In the utility model, the hypotenuse of the slope transition part is connected to the first part and the second part respectively through the first arc segment 4 and the second arc segment 5, which can reduce the generation of packaging dead corners, avoid electrolyte retention in the dead corners, and ensure the performance of the battery cell.

[0054] Furthermore, the angle between the hypotenuse and the length direction of the packaging surface 3 is 15°-75°, for example, it can be 15°, 20°, 25°, 30°, 35°, 45°, 50°, 60°, 70° or 75°.

[0055] Furthermore, the packaging portion 1 is formed by extending the packaging surface 3 along the second direction; and one side surface of the packaging portion 1 is a Z-shaped curved surface.

[0056] In the present invention, when the packaging portion 1 is formed by extending the packaging surface 3 along the second direction, the side surfaces corresponding to the hypotenuse of the slope transition portion of the packaging surface 3 and the long sides of the first and second portions connected thereto are Z-shaped curved surfaces.

[0057] Furthermore, the base 2 includes a long plate and a short plate, and the long plate and the short plate are vertically connected to form an L-shaped structure; a side surface of the short plate away from the long plate is connected to a terminal extending along the second direction of the packaging surface 3.

[0058] Furthermore, the long plate is provided with through holes.

[0059] In another specific embodiment, the utility model provides a packaging method for a micro soft-pack battery, the process of which is as follows: Figure 2 As shown, the following steps are included:

[0060] (1) Roll the battery core into the pocket bag;

[0061] (2) Top seal the roll core into the pocket bag;

[0062] (3) side sealing with an asymmetric sealing head width, that is, side sealing with two symmetrically arranged side sealing heads provided in the above specific embodiments;

[0063] (4) The packaged roll core is placed in an oven and filled with liquid.

[0064] In the above packaging method, before performing the top sealing and the side sealing, the parallelism of the top sealing head and the side sealing head are adjusted respectively using carbon paper.

[0065] The soft pack battery obtained by packaging using the above method is as follows Figure 3 As shown, it can be seen that for a narrower micro soft-pack battery, the second portion with a larger width on the packaging surface 3 is used for side sealing at the battery cell body 6, and the first portion with a smaller width is used for side sealing at the air bag 7, which can increase the size of the injection port, which is beneficial to injection, and at the same time does not affect the effective sealing width of the side seal at the position of the battery cell body 6; it can also reduce the heat radiation between the bottom of the battery cell body 6 and the air bag 7, reduce adhesion, and facilitate the electrolyte to enter the winding core; and it can increase the space for accommodating the electrolyte, avoid electrolyte contamination of the battery cell, and improve production yield; in addition, the slope transition portion is smoothly connected to the first portion and the second portion through the first arc segment 4 and the second arc segment 5, respectively, which can reduce the generation of packaging dead corners, avoid electrolyte retention in dead corners, and ensure battery cell performance.

[0066] The above description is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. Technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by technicians in the relevant technical field within the technical scope disclosed in the present utility model fall within the protection scope and disclosure scope of the present utility model.

Claims

1. A side sealing head for soft pack battery packaging, characterized in that: The side sealing head comprises a base and a packaging part, wherein the base is arranged along a first direction; the packaging part comprises a packaging surface extending along a second direction, wherein the second direction intersects with the first direction; and a terminal end of the packaging surface extending along the second direction is connected to a surface of the base; The packaging surface is a plane; along the length direction of the packaging surface, the packaging surface is divided into a first part, a slope transition part and a second part which are connected in sequence; the width of the first part and the width of the second part are both fixed, and the width of the first part is smaller than the width of the second part; One end of the slope transition portion is smoothly connected to the first portion, and the other end is smoothly connected to the second portion.

2. The side sealing head for soft pack battery packaging according to claim 1, characterized in that: A ratio of a width of the first portion to a width of the second portion is 1:(1.5-4); The ratio of the length of the first part to the length of the second part is (0.8-2):

1.

3. The side sealing head for soft pack battery packaging according to claim 1, characterized in that: Along the direction from the first portion to the second portion, the width of the slope transition portion gradually increases.

4. The side sealing head for soft pack battery packaging according to claim 1, characterized in that: The shape of the slope transition part is a right-angle trapezoid.

5. The side sealing head for soft pack battery packaging according to claim 4, characterized in that: The right-angled trapezoid has a top side and a bottom side that are arranged oppositely, and a hypotenuse and a right-angle side that are arranged oppositely; The width of the top edge is the same as the width of the first portion, and the top edge is connected to the first portion; the width of the bottom edge is the same as the width of the second portion, and the bottom edge is connected to the second portion.

6. The side sealing head for soft pack battery packaging according to claim 5, characterized in that: The hypotenuse is smoothly connected to a long side of the first part through a first arc segment; The hypotenuse is smoothly connected to a long side of the second part through a second arc segment.

7. The side sealing head for soft pack battery packaging according to claim 5, characterized in that: The angle between the hypotenuse and the length direction of the packaging surface is 15°-75°.

8. The side sealing head for soft pack battery packaging according to claim 6, characterized in that: The packaging portion is formed by extending the packaging surface along the second direction; and a side surface of the packaging portion is a Z-shaped curved surface.

9. The side sealing head for soft pack battery packaging according to claim 1, characterized in that: The base includes a long plate and a short plate, and the long plate and the short plate are vertically connected to form an L-shaped structure; A side surface of the short board away from the long board is connected to a terminal of the packaging surface extending along the second direction.

10. The side sealing head for soft pack battery packaging according to claim 9, characterized in that: The long plate is provided with through holes.

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