Top seal head and packaging device

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a top seal head and a packaging device.The top seal head comprises a seal head body, the seal head body is provided with a heat sealing surface, one side of the seal head body is provided with a preheating block corresponding to the heat sealing surface, the preheating block is provided with a first groove and a second groove in parallel, and the first groove and the second groove are communicated with each other. The depth of the first groove is smaller than that of the second groove; the positive pole lug and the negative pole lug can be in better contact with the preheating block in the preheating process, so that the positive pole lug and the negative pole lug can be uniformly heated when the preheating block is preheated, the phenomenon that the top sealing effect of the soft package battery is influenced due to non-uniform preheating of the positive pole lug and the negative pole lug is avoided, and false sealing or liquid leakage of the soft package battery is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery production and manufacturing, and specifically relates to a top sealing head and a packaging device. Background Art

[0002] As a new type of secondary battery, lithium-ion battery has the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. It has broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] The packaging process of soft-pack batteries requires multiple packaging steps such as top sealing and side sealing. The top sealing is achieved by heating and melting the tab glue on the tab with the aluminum-plastic film. The existing top sealing mechanism is generally equipped with an auxiliary heating block. During the packaging process, the auxiliary heating block is used to press the tab and conduct heat to the tab.

[0004] However, with the diversification of soft-pack battery designs, the materials of the positive and negative tabs are also different. In order to ensure that the positive and negative tabs can achieve the same effect during the charging and discharging process, different thicknesses of positive and negative metal strips are selected when designing soft-pack batteries. This causes a thickness difference between the positive and negative tabs of the soft-pack battery. When the auxiliary heating block is pressed down, its pressing surface has poor contact with the thinner tab, resulting in uneven preheating of the positive and negative tabs by the auxiliary heating block. This in turn affects the top sealing effect of the soft-pack battery, and the soft-pack battery may be sealed or leak. Utility Model Content

[0005] The purpose of the utility model is to provide a top sealing head in view of the deficiencies in the prior art, which solves the technical problem in the prior art that due to the difference in thickness between the positive electrode tab and the negative electrode tab, the auxiliary heating block preheats the positive electrode tab and the negative electrode tab unevenly, thereby affecting the top sealing effect of the soft-pack battery.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A top seal head comprises a head body, the head body having a heat seal surface, a preheating block corresponding to the heat seal surface is arranged on one side of the head body, a first groove and a second groove are arranged in parallel on the preheating block, and a depth L of the first groove is less than a depth H of the second groove.

[0008] Preferably, the second groove includes a first accommodating area and a second accommodating area from top to bottom, the first accommodating area is connected to the second accommodating area, and a width D of the second accommodating area is smaller than a width C of the first accommodating area.

[0009] Preferably, the second accommodating area is located in the middle or on one side of the first accommodating area.

[0010] Preferably, a depth P of the first accommodation area is the same as a depth L of the first groove.

[0011] Preferably, the width F of the first groove and the width K of the second groove are both the same as the width J of the preheating block.

[0012] Preferably, the depth L of the first groove and the depth H of the second groove satisfy the relationship: L=an, H=bn, wherein a is the thickness of the negative electrode tab, b is the thickness of the positive electrode tab, and n is 100-200 μm.

[0013] Preferably, the length M of the first groove and the length N of the second groove satisfy the relationship: M=d+m, N=e+m, wherein d is the width of the negative electrode tab, e is the width of the positive electrode tab, and m is 5-20 μm.

[0014] Preferably, the length M of the first groove is the same as the length N of the second groove.

[0015] Preferably, the head body is provided with a first pole lug groove and a second pole lug groove on the heat sealing surface, the first pole lug groove and the second pole lug groove are arranged in parallel, and the first groove corresponds to the position of the first pole lug groove, and the second groove corresponds to the position of the second pole lug groove.

[0016] Another object of the present invention is to provide a packaging device, comprising a first sealing head and a second sealing head arranged opposite to each other, wherein one of the first sealing head and the second sealing head is the top sealing head described in the foregoing description.

[0017] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0018] The top-sealing head of the utility model is provided with a first groove and a second groove on the preheating block of the head body, the depth of the first groove is less than the depth of the second groove, and during the packaging process, the first groove is used to accommodate the thinner electrode ear of the positive electrode ear and the negative electrode ear, and the second groove is used to accommodate the thicker electrode ear of the positive electrode ear and the negative electrode ear, so that the positive electrode ear and the negative electrode ear can better contact with the preheating block during the preheating process, ensuring that the positive electrode ear and the negative electrode ear can be heated evenly when the preheating block is preheated, thereby avoiding affecting the top-sealing effect of the soft-pack battery due to uneven preheating of the positive electrode ear and the negative electrode ear, and further avoiding false sealing or leakage of the soft-pack battery.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of the packaging device of the utility model.

[0022] Figure 2 It is a structural schematic diagram of the top sealing head of the utility model.

[0023] Figure 3 It is a schematic diagram of the top structure of the top seal head of the utility model.

[0024] Figure 4 It is another structural schematic diagram of the top sealing head of the utility model.

[0025] Figure 5 It is a structural schematic diagram of the preheating block of the utility model.

[0026] Figure 6 It is a schematic diagram of the cross-sectional structure of the preheating block of the utility model.

[0027] Figure 7 This is another cross-sectional structural schematic diagram of the preheating block of the utility model.

[0028] The reference numerals are described as follows:

[0029] 100, packaging device; 101, first end cap; 102, second end cap;

[0030] 10. Top seal head; 11. Head body; 111. Heat seal cover; 112. First pole lug groove; 113. Second pole lug groove;

[0031] 20. Preheating block; 21. First groove; 22. Second groove; 221. First accommodating area; 222. Second accommodating area. DETAILED DESCRIPTION

[0032] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0033] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0034] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection 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 utility model can be understood according to the specific circumstances.

[0035] The following will be combined with the attached Figures 1 to 7 The technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] See also Figures 1 to 7 The top sealing head 10 of the embodiment of the utility model includes a head body 11, the head body 11 has a heat sealing surface 111, and a preheating block 20 corresponding to the heat sealing surface 111 is arranged on one side of the head body 11, and a first groove 21 and a second groove 22 are arranged in parallel on the preheating block 20, and the depth L of the first groove 21 is less than the depth H of the second groove 22.

[0037] Compared with the prior art, the top sealing head 10 of the utility model embodiment is provided with a first groove 21 and a second groove 22 on the preheating block 20 of the head body 11, and the depth L of the first groove 21 is less than the depth H of the second groove 22. During the packaging process, the first groove 21 is used to accommodate the thinner electrode ear of the positive electrode ear and the negative electrode ear, and the second groove 22 is used to accommodate the thicker electrode ear of the positive electrode ear and the negative electrode ear, so that the positive electrode ear and the negative electrode ear can better contact with the preheating block 20 during the preheating process, ensuring that the positive electrode ear and the negative electrode ear can be heated evenly when the preheating block 20 is preheated, thereby avoiding the top sealing effect of the soft-pack battery being affected by the uneven preheating of the positive electrode ear and the negative electrode ear, and further avoiding false sealing or leakage of the soft-pack battery.

[0038] The inventors found that in order to increase the charge and discharge rate of the soft-pack battery, the positive electrode tab adopts an aluminum-to-nickel structure. At this time, the thickness of the negative electrode tab is less than the thickness of the positive electrode tab using the aluminum-to-nickel structure. During the packaging process, the first groove is used to accommodate the negative electrode tab, and the second groove is used to accommodate the positive electrode tab using the aluminum-to-nickel structure.

[0039] See also Figure 4 , 6 ~7, in some embodiments, the second groove 22 includes a first accommodating area 221 and a second accommodating area 222 from top to bottom, the first accommodating area 221 is connected to the second accommodating area 222, and the width D of the second accommodating area 222 is smaller than the width C of the first accommodating area 221. Through the coordinated use of the first accommodating area 221 and the second accommodating area 222, the second accommodating area 222 is located below the first accommodating area 221 and is connected to the first accommodating area 221, and the width D of the second accommodating area 222 is smaller than the width C of the first accommodating area 221. During the packaging process, the second groove 22 can better accommodate the positive electrode tab with an aluminum-to-nickel structure, ensuring that the positive electrode tab can be heated evenly when the preheating block 20 is preheated, thereby improving the top sealing effect of the soft-pack battery.

[0040] In some embodiments, the second accommodation area 222 is located in the middle or one side of the first accommodation area 221. When the second accommodation area 222 is located in the middle of the first accommodation area 221, the second accommodation area 222 corresponds to the junction of the aluminum-nickel structure; when the second accommodation area 222 is located on one side of the first accommodation area 221, the second accommodation area 222 is used to accommodate the nickel strip. During the packaging process, the second groove 22 can better accommodate the positive electrode tab with the aluminum-nickel structure, ensuring that the positive electrode tab can be heated evenly when the preheating block 20 is preheated, thereby improving the top sealing effect of the soft-pack battery.

[0041] See also Figure 4 , 57. In some embodiments, the depth P of the first accommodating area 221 is the same as the depth L of the first groove 21. By setting the depth P of the first accommodating area 221 and the depth L of the first groove 21, the depth P of the first accommodating area 221 is the same as the depth L of the first groove 21, ensuring that the positive electrode tab and the negative electrode tab can be heated evenly when the preheating block 20 is preheated, thereby avoiding affecting the top sealing effect of the soft-pack battery due to uneven preheating of the positive electrode tab and the negative electrode tab.

[0042] See also Figures 2-3 In some embodiments, the width F of the first groove 21 and the width K of the second groove 22 are both the same as the width J of the preheating block 20. By setting the width F of the first groove 21 and the width K of the second groove 22, the width F of the first groove 21 and the width K of the second groove 22 are both the same as the width J of the preheating block 20, which increases the contact area between the negative electrode tab and the positive electrode tab and the preheating block 20, and improves the heat conduction efficiency.

[0043] In some embodiments, the depth L of the first groove 21 and the depth H of the second groove 22 satisfy the relationship: L = an, H = bn, where a is the thickness of the negative electrode tab, b is the thickness of the positive electrode tab, and n is 100-200 μm. By setting the depth L of the first groove 21 and the depth H of the second groove 22, the depth L of the first groove 21 needs to be set according to the thickness of the negative electrode tab to ensure that the preheating block 20 can better contact with the negative electrode tab, thereby avoiding uneven heating of the negative electrode tab during preheating; similarly, the depth H of the second groove 22 needs to be set according to the thickness of the positive electrode tab to ensure that the preheating block 20 can better contact with the positive electrode tab, thereby avoiding uneven heating of the positive electrode tab during preheating. Therefore, the depth L of the first groove 21 and the depth H of the second groove 22 satisfy the relationship: L=an, H=bn, which effectively ensures that the positive electrode tab and the negative electrode tab can be heated evenly during preheating, thereby avoiding the top sealing effect of the soft-pack battery being affected by uneven preheating of the positive electrode tab and the negative electrode tab, thereby avoiding false sealing or leakage of the soft-pack battery.

[0044] Further, the depth L of the first groove 21 is 100-900 μm, and the depth H of the second groove 22 is 100-900 μm.

[0045] In some embodiments, the length M of the first groove 21 and the length N of the second groove 22 satisfy the relationship: M=d+m, N=e+m, wherein d is the width of the negative electrode tab, e is the width of the positive electrode tab, and m is 5-20 μm. By setting the length M of the first groove 21 and the length N of the second groove 22, the length M of the first groove 21 needs to be set according to the width of the negative electrode tab to ensure that the negative electrode tab can be accommodated in the first groove 21; similarly, the length N of the second groove 22 needs to be set according to the width of the positive electrode tab to ensure that the positive electrode tab can be accommodated in the second groove 22. Therefore, the length M of the first groove 21 and the length N of the second groove 22 satisfy the relationship: M=d+m, N=e+m, so that a gap is formed between the negative electrode tab and the side wall of the first groove 21, and a gap is formed between the positive electrode tab and the side wall of the second groove 22, ensuring that the negative electrode tab can be better accommodated in the first groove 21, and the positive electrode tab can be better accommodated in the second groove 22.

[0046] Further, a length M of the first groove 21 is the same as a length N of the second groove 22 .

[0047] Specifically, the length M of the first groove 21 and the length N of the second groove 22 are both 30-100 μm.

[0048] See also Figures 2 to 4 In some embodiments, the sealing body 11 is provided with a first tab groove 112 and a second tab groove 113 located on the heat sealing surface 111. The first tab groove 112 and the second tab groove 113 are arranged in parallel, and the first groove 21 corresponds to the first tab groove 112, and the second groove 22 corresponds to the second tab groove 113. Through the arrangement of the first tab groove 112 and the second tab groove 113, the first tab groove 112 is used to accommodate the tab glue of the negative tab, and the second tab groove 113 is used to accommodate the tab glue of the positive tab. Since the first groove 21 corresponds to the first tab groove 112, and the second groove 22 corresponds to the second tab groove 113, the position of the soft-pack battery during the preheating and packaging process is effectively made consistent, thereby improving the packaging effect of the soft-pack battery.

[0049] See also Figures 1 to 7 The packaging device 100 of the embodiment of the utility model includes a first head 101 and a second head 102 arranged opposite to each other, and one of the first head 101 and the second head 102 is the top sealing head 10 of the above embodiment.

[0050] Compared with the prior art, the packaging device 100 of the embodiment of the utility model adopts the top sealing head 10 of the above-mentioned embodiment. The top sealing head 10 can ensure that the positive electrode tab and the negative electrode tab are heated evenly during preheating, thereby avoiding the top sealing effect of the soft-pack battery being affected by the uneven preheating of the positive electrode tab and the negative electrode tab, thereby avoiding false sealing or leakage of the soft-pack battery.

[0051] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A top seal head, characterized in that: The invention comprises a sealing head body (11), wherein the sealing head body (11) has a heat sealing surface (111), a preheating block (20) corresponding to the heat sealing surface (111) is arranged on one side of the sealing head body (11), a first groove (21) and a second groove (22) are arranged in parallel on the preheating block (20), and a depth L of the first groove (21) is smaller than a depth H of the second groove (22).

2. The top seal head according to claim 1, characterized in that: The second groove (22) comprises, from top to bottom, a first accommodating area (221) and a second accommodating area (222); the first accommodating area (221) is connected to the second accommodating area (222), and a width D of the second accommodating area (222) is smaller than a width C of the first accommodating area (221).

3. The top seal head according to claim 2, characterized in that: The second accommodating area (222) is located in the middle or on one side of the first accommodating area (221).

4. The top seal head according to claim 2, characterized in that: The depth P of the first accommodating area (221) is the same as the depth L of the first groove (21).

5. The top seal head according to claim 1, characterized in that: The width F of the first groove (21) and the width K of the second groove (22) are both the same as the width J of the preheating block (20).

6. The top seal head according to claim 1, characterized in that: The depth L of the first groove (21) and the depth H of the second groove (22) satisfy the relationship: L=an, H=bn, wherein a is the thickness of the negative electrode tab, b is the thickness of the positive electrode tab, and n is 100 to 200 μm.

7. The top seal head according to claim 1, characterized in that: The length M of the first groove (21) and the length N of the second groove (22) satisfy the relationship: M=d+m, N=e+m, wherein d is the width of the negative electrode tab, e is the width of the positive electrode tab, and m is 5 to 20 μm.

8. The top seal head according to claim 7, characterized in that: The length M of the first groove (21) is the same as the length N of the second groove (22).

9. The top seal head according to claim 1, characterized in that: The sealing head body (11) is provided with a first pole lug groove (112) and a second pole lug groove (113) on the heat sealing face (111); the first pole lug groove (112) and the second pole lug groove (113) are arranged in parallel, and the first groove (21) corresponds to the first pole lug groove (112) in position, and the second groove (22) corresponds to the second pole lug groove (113) in position.

10. A packaging device, characterized in that: It comprises a first head (101) and a second head (102) which are arranged opposite to each other, and one of the first head (101) and the second head (102) is the top sealing head according to any one of claims 1 to 9.

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