CN219959343U - Positive and negative electrode tab and soft package battery - Google Patents

Abstract

A positive and negative electrode lug comprises a positive electrode lug substrate, a negative electrode lug substrate and colloid; the positive electrode lug substrate and the negative electrode lug substrate are arranged at intervals along the length direction of the colloid, and the positive electrode lug and the negative electrode lug comprise five areas which are divided into a positive electrode lug edge area, a positive electrode lug area, a middle area, a negative electrode lug area and a negative electrode lug edge area; wherein the thickness difference between any two regions is in the range of 0-100 μm. The utility model adopts an integrated structure of the anode tab and the cathode tab, solves the problems of unstable packaging thickness, liquid leakage and the like in the packaging process, and improves the packaging effect. The utility model also discloses a soft package battery.

Description

Positive and negative electrode tab and soft package battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a positive and negative electrode lug and a soft package battery.

Background

The tabs of the soft-packed battery are divided into a positive tab and a negative tab, the tabs of the two polarities are independent, and each tab comprises a tab substrate and tab glue (such as polypropylene pp glue). When the soft package battery with the tab at the same side is packaged, the pp layer of the tab and the insulating adhesive layer (such as the polypropylene pp layer) of the aluminum plastic film are thermally fused together through the hot pressing of the sealing head. The thickness of each position of the package is inconsistent, and the thickness of the positive electrode lug area, the thickness of the negative electrode lug area and the thickness of the electrodeless lug area are divided, so that two seal head structures are conventionally arranged. The sealing head is divided into a soft sealing head and a hard sealing head according to the material of the sealing head.

The soft sealing head is made of silica gel, the surface is smooth, and when in heat sealing, the silica gel can be extruded and deformed due to the lug base body, and the effect of inconsistent thickness of each position is formed. The device has the advantages that the device is not influenced by the width specification of the tab, and the phenomenon that the slot is stamped on the substrate does not exist. The defect is that the silica gel is easy to age when heated, the packaging thickness is unstable, the seal is unclear, and the method is suitable for low-end products with low requirements.

The hard sealing head is made of metal materials such as steel, copper, alloy and the like. Due to the lug substrate, grooves are formed in different positions of the sealing head according to the requirements of the width of the lug and the thickness of each position. Its advantages are clear seal, stable thickness and long service life of seal head. The defect is that when the size or the placement position of the tab fluctuates, dislocation can occur between the tab substrate and the slot mark, and the slot mark can press the tab substrate, so that poor insulation is caused. In addition, the width of the groove is slightly larger than the specification of the lug, and when the groove is too large, the liquid leakage is easy due to poor hot melting, and when the groove is too small, the base body of the lug can be pressed by the groove.

The electrodeless ear area is only fused together by an insulating adhesive layer (such as a polypropylene pp layer) of the aluminum plastic film, the colloid amount is small, heat radiation is easy to occur, and electrolyte is easy to erode the heat radiation area, so that poor insulation is caused or the aluminum plastic film is corroded.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the utility model aims to provide a positive and negative electrode lugs and a soft package battery, which solve the problems of unstable packaging thickness and unclear sealing in the packaging process; the problem that the groove marks and the lug matrixes are misplaced in the packaging process is solved, and the leakage risk is reduced; colloid is added in the electrodeless ear area, so that the problems of poor insulation or corrosion of the aluminum plastic film during heat sealing are solved.

The aim of the utility model is achieved by the following technical scheme:

a positive and negative electrode lug comprises a positive electrode lug substrate, a negative electrode lug substrate and colloid; the positive electrode lug base body and the negative electrode lug base body are arranged at intervals along the length direction of the colloid and fixedly connected with the colloid, and two ends of the colloid extend out of the positive electrode lug base body and the negative electrode lug base body; along the length direction of the colloid, the positive and negative electrode lugs comprise five areas, namely a positive electrode lug edge area, a positive electrode lug area, a middle area, a negative electrode lug area and a negative electrode lug edge area; the positive electrode lug edge area is positioned in an area close to the positive electrode lug substrate and far away from the negative electrode lug substrate, and comprises colloid; the negative electrode lug edge area is positioned in an area close to the negative electrode lug substrate and far away from the positive electrode lug substrate, and comprises colloid; the middle area is positioned in the area between the positive electrode lug substrate and the negative electrode lug substrate, and comprises colloid; the positive electrode lug area is positioned in an area between the edge area and the middle area of the positive electrode lug, and comprises colloid and a positive electrode lug substrate; the negative electrode lug area is positioned in an area between the middle area and the negative electrode lug edge area, and comprises colloid and a negative electrode lug substrate; wherein the thickness difference between any two regions of the positive electrode tab edge region, the positive electrode tab region, the middle region, the negative electrode tab region and the negative electrode tab edge region is in the range of 0-100 μm.

In an embodiment, the colloid of the positive electrode tab area includes a first adhesive layer and a second adhesive layer, the first adhesive layer is disposed on one side of the surface of the positive electrode tab substrate along the thickness direction of the colloid, and the second adhesive layer is disposed on the other side surface opposite to the one side of the surface of the positive electrode tab substrate; the colloid in negative pole ear district includes third glue film and fourth glue film, follows the thickness direction of colloid, the third glue film sets up one side on negative pole ear base member surface, the fourth glue film set up with negative pole ear base member surface one side opposite side surface.

In an embodiment, the thickness of the first adhesive layer is L1, the thickness of the second adhesive layer is L2, the thickness of the third adhesive layer is L3, and the thickness of the fourth adhesive layer is L4, wherein the ranges of L1, L2, L3, and L4 are all 50-500 μm.

In an embodiment, the thickness difference between the thickness of the first glue layer and the thickness of the second glue layer is 0-50 μm; and/or the thickness difference between the thickness of the third glue layer and the thickness of the fourth glue layer is 0-50 μm.

In an embodiment, the thickness of the colloid in the edge region of the positive electrode tab, the edge region of the negative electrode tab and the middle region is B; the thickness of the first adhesive layer is L1, the thickness of the second adhesive layer is L2, the thickness of the third adhesive layer is L3, and the thickness of the fourth adhesive layer is L4; the thickness of the positive electrode lug substrate is A1, and the thickness of the negative electrode lug substrate is A2; wherein l1+a1+l2=b, l3+a2+l4=b.

In one embodiment, the thickness of the positive electrode tab substrate is A1, and the range of A1 is 100-1000 μm; and/or the thickness of the negative electrode lug substrate is A2, and the range of A2 is 50-1000 mu m.

In an embodiment, along the width direction of the colloid, the middle part of the colloid is a seal area for packaging and bonding the colloid and the aluminum plastic film, the width of the colloid is D2, and the width of the seal area is D1, wherein D2-D1 is more than 0 and less than or equal to 3mm.

The utility model also provides a soft package battery, which comprises a bare cell, an aluminum plastic film and the positive and negative electrode lugs, wherein the bare cell is arranged in the aluminum plastic film, the positive and negative electrode lugs are arranged on the same side of the bare cell, and one end of the positive electrode lug substrate and one end of the negative electrode lug substrate are connected with the bare cell.

In an embodiment, the other end of the positive electrode tab substrate and the other end of the negative electrode tab substrate are exposed out of the aluminum plastic film, the colloid and the aluminum plastic film are bonded through seal head packaging, and the length of the colloid is greater than or equal to the length of one side of the aluminum plastic film packaging.

According to the positive and negative electrode lugs provided by the utility model, the positive electrode lug substrate, the negative electrode lug substrate and the colloid are arranged into an integrated structure, and the colloid is fixedly attached to the positive electrode lug substrate and the negative electrode lug substrate at the same time, so that the colloid is arranged in the connecting area between the positive electrode lug substrate and the negative electrode lug substrate and in the edge area between the positive electrode lug substrate and the negative electrode lug substrate, the colloid in the electrodeless lug area and the insulating adhesive layer of the aluminum plastic film can be fully and thermally fused together during packaging, the problems that the original electrodeless lug area is only thermally fused together by the insulating adhesive layer of the aluminum plastic film, the colloid quantity is small, heat radiation is easy to occur, and the electrolyte is easy to erode the heat radiation area, so that poor insulation or the aluminum plastic film is corroded are caused, and the sealing performance of the packaged soft-package battery is greatly improved; in addition, the thickness difference in each region of positive and negative electrode tab is little, and the hard head that matches need not to open a groove when the encapsulation, and when tab base member size variation and placement position take place undulant, dislocation phenomenon can not appear in tab base member and groove mark, avoids the groove mark to press the tab to appear melting the bad problem of glue, avoids the risk of weeping, can compromise the tab of different specification width simultaneously, has simplified the structure of hard head, has practiced thrift manufacturing cost.

Drawings

FIG. 1 is a schematic top view of an anode tab and a cathode tab according to the present utility model;

FIG. 2 is a schematic front view of the positive and negative electrode tabs of the present utility model;

FIG. 3 is a schematic view showing that the length of the glue is equal to the length of the aluminum plastic film packaging side during packaging;

fig. 4 is a schematic diagram showing that the length of the colloid is longer than the length of the aluminum plastic film packaging side in the packaging process of the utility model.

In the figure: the lithium battery cell comprises a 1-positive electrode lug substrate, a 2-negative electrode lug substrate, a 3-colloid, a 31-positive electrode lug edge region, a 32-positive electrode lug region, a 321-first adhesive layer, a 322-second adhesive layer, a 33-intermediate region, a 34-negative electrode lug region, a 341-third adhesive layer, a 342-fourth adhesive layer, a 35-negative electrode lug edge region, a 36-seal region, a 4-bare cell and a 5-aluminum plastic film.

Detailed Description

Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms described above will be understood to those of ordinary skill in the art in a specific context.

The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," and the like are used as references to orientations or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the inventive product is conventionally disposed in use, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore are not to be construed as limiting the utility model.

The terms "first," "second," "third," and the like, are merely used for distinguishing between similar elements and not necessarily for indicating or implying a relative importance or order.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements does not include only those elements but may include other elements not expressly listed.

The utility model provides a positive and negative electrode lug, which comprises a positive electrode lug substrate 1, a negative electrode lug substrate 2 and a colloid 3 which are in strip-shaped structures as shown in fig. 1 and 2. The positive electrode lug substrate 1 and the negative electrode lug substrate 2 are arranged at intervals along the length direction X of the colloid 3, so that the positive electrode lug substrate 1 and the negative electrode lug substrate 2 are prevented from being contacted to form a short circuit; and the positive electrode lug substrate 1 and the negative electrode lug substrate 2 are fixedly connected with the colloid 3, so that the positive electrode lug substrate 1 and the negative electrode lug substrate 2 are prevented from falling off from the colloid 3, and the positive electrode lug substrate 1 and the negative electrode lug substrate 2 are prevented from being in direct contact with the aluminum plastic film 5 to generate short circuit during packaging. The two ends of the colloid 3 extend out of the positive electrode lug substrate 1 and the negative electrode lug substrate 2, so that the colloid 3 is arranged at the joint of the edge of the positive electrode lug and the negative electrode lug and the aluminum plastic film 5, and the colloid 3 and the aluminum plastic film are bonded with each other, so that the sufficient glue amount is available, and the sealing effect is improved. As shown in fig. 1, along the width direction Y of the colloid 3, both the positive electrode tab substrate 1 and the negative electrode tab substrate 2 pass through the colloid 3, and both ends of the positive electrode tab substrate 1 and the negative electrode tab substrate 2 are exposed outside the colloid 3; as shown in fig. 3 and fig. 4, on one side of the colloid 3, one end of the positive electrode tab substrate 1 is connected with the positive electrode of the bare cell 4, and one end of the negative electrode tab substrate 2 is connected with the negative electrode of the bare cell 4; on the other side of the colloid 3, the other end of the positive electrode lug substrate 1 is connected with the positive electrode of an external circuit, and the other end of the negative electrode lug substrate 2 is connected with the negative electrode of the external circuit, so that current is led out from the bare cell 4 to form a loop. As shown in fig. 2, along the thickness direction Z of the colloid 3, the thickness difference between any two areas in the five areas is 0-100 μm, that is, the electrode ear areas with positive and negative electrode ears and the electrode ear areas with no electrode ear are both provided with the colloid 3, so that the problems of unstable packaging thickness and unclear sealing in the packaging process are solved, the problem of dislocation of the groove marks and the electrode ear matrix in the packaging process is solved, the risk of liquid leakage is reduced, the colloid is added in the electrode ear areas, the problem of poor insulation or corrosion of the aluminum plastic film 5 in the heat sealing process is solved, and the quality and stability of the soft package battery are greatly improved.

In this embodiment, as shown in fig. 2, along the length direction X of the colloid 3, the positive and negative electrode tabs include five regions: a positive tab edge region 31, a positive tab region 32, a middle region 33, a negative tab region 34, and a negative tab edge region 35. Wherein the positive electrode tab edge region 31 is located in a region close to the positive electrode tab substrate 1 and far from the negative electrode tab substrate 2, and the region is only the colloid 3; the negative electrode tab edge region 35 is located in a region close to the negative electrode tab base 2 and far from the positive electrode tab base 1, which is only the colloid 3. The intermediate region 33 is located in the region between the positive electrode tab substrate 1 and the negative electrode tab substrate 2, which has only the colloid 3; the positive electrode tab region 32 is located in a region between the positive electrode tab edge region 31 and the intermediate region 33, and includes the colloid 3 and the positive electrode tab base 1; the negative electrode tab region 34 is located in the region between the intermediate region 33 and the negative electrode tab edge region 35, which contains the gel 3 and the negative electrode tab substrate 2. Wherein, along the thickness direction Z of the colloid 3, the thickness difference between any two areas is in the range of 0-100 mu m, and the thickness difference between the areas is small and is controlled within 100 mu m. Further, in the thickness direction Z of the gel 3, the thickness difference between any two regions is in the range of 0 to 20 μm. The thickness difference between each region of the positive electrode lug and the negative electrode lug is small, and the matched hard sealing heads do not need to be grooved to adapt to regions with different thicknesses during packaging, so that the working procedures of manufacturing the hard sealing heads are reduced, and the production efficiency can be improved. When the size change and the placement position of the positive lug substrate 1 and the negative lug substrate 2 fluctuate, the dislocation phenomenon can not occur to the lug substrate and the groove mark, the problem that the glue melting is poor is avoided when the lug is pressed by the groove mark, the risk of liquid leakage is avoided, the lugs with different specification widths can be considered, the structure of the hard seal head is simplified, and the production cost is saved.

In this embodiment, the positive tab substrate 1 and the negative tab substrate 2 are both metal conductors, the material of the positive tab substrate 1 may be aluminum or stainless steel, and the material of the negative tab substrate 2 may be nickel or copper nickel plating. The colloid 3 is insulating hot melt adhesive, and polypropylene pp adhesive can be selected. The colloid 3 is bonded with the positive electrode lug substrate 1 and the negative electrode lug substrate 2 by hot pressing, and the positive electrode lug substrate 1 and the negative electrode lug substrate 2 are parallel to each other and are perpendicular to the colloid 3. Of course, the positive electrode tab substrate 1 and the negative electrode tab substrate 2 may be disposed obliquely to the colloid 3. The aluminum plastic film 5 is a multi-layer composite film and comprises a nylon layer, an aluminum foil layer and a heat sealing layer. The nylon layer is an outer layer and plays roles of auxiliary forming and protection; the aluminum foil layer is a barrier layer and plays roles in molding and barrier; the heat sealing layer is an inner layer and mainly used for sealing and bonding, and the polypropylene pp layer can be selected.

Specifically, the positive and negative electrode tabs provided by the embodiment are provided with the integrated structure, the positive electrode tab substrate 1, the negative electrode tab substrate 2 and the colloid 3 are fixedly attached to the positive electrode tab substrate 1 and the negative electrode tab substrate 2 at the same time, so that the colloid 3 is arranged in the connecting area between the positive electrode tab substrate 1 and the negative electrode tab substrate 2 and in the edge area between the positive electrode tab substrate 1 and the negative electrode tab substrate 2, the colloid 3 in the electrodeless tab area and the insulating adhesive layer of the aluminum plastic film 5 can be fully thermally fused together during packaging, the problem that the original electrodeless tab area is thermally fused together only by the insulating adhesive layer of the aluminum plastic film 5, the colloid 3 is small in quantity, heat radiation is easy to occur, and the electrolyte is easy to erode a heat radiation area, so that poor insulation or the aluminum plastic film 5 is corroded is caused, and the sealing performance of the soft package battery after heat sealing is greatly improved; in addition, the thickness difference in each region of positive and negative electrode lugs is little, and the hard head that matches need not to be grooved during the encapsulation, and when the size change and the placement position of positive electrode lug base member 1, negative electrode lug base member 2 take place undulantly, dislocation phenomenon can not appear in utmost point ear base member and groove mark, avoids the groove mark to press the utmost point ear to appear melting the bad problem of glue, avoids the risk of weeping, can compromise the utmost point ear of different specification width simultaneously, has simplified the structure of hard head, has practiced thrift manufacturing cost.

As an embodiment, as shown in fig. 2, the gel 3 of the positive electrode tab area 32 includes a first gel layer 321 and a second gel layer 322, the first gel layer 321 is disposed on one side of the surface of the positive electrode tab substrate 1 along the thickness direction Z of the gel 3, and the second gel layer 322 is disposed on the other side surface opposite to the one side of the surface of the positive electrode tab substrate 1; the gel 3 of the negative electrode ear region 34 includes a third gel layer 341 and a fourth gel layer 342, the third gel layer 341 is disposed on one side of the surface of the negative electrode ear substrate 2 along the thickness direction Z of the gel 3, and the fourth gel layer 342 is disposed on the surface of the other side opposite to the surface of the negative electrode ear substrate 2.

Specifically, when the positive and negative electrode tabs and the aluminum plastic film 5 are bonded by using the seal head through hot pressing, the colloid 3 in the positive electrode tab edge area 31, the middle area 33 and the negative electrode tab edge area 35 in the electrodeless tab area are bonded with the pp adhesive in the inner layer of the aluminum plastic film 5, the first adhesive layer 321 and the second adhesive layer 322 in the positive electrode tab area 32 are respectively bonded with the pp adhesive in the inner layer of the aluminum plastic film 5, the third adhesive layer 341 and the fourth adhesive layer 342 in the negative electrode tab area 34 are respectively bonded with the insulating adhesive in the inner layer of the aluminum plastic film 5, so that the packaging bonding positions are provided with sufficient adhesive, and the colloid 3 and the insulating adhesive in the inner layer of the aluminum plastic film 5 can be well fused to ensure the sealing performance of the bare cell 4.

As an embodiment, as shown in fig. 2, the thickness of the first adhesive layer 321 is L1, the thickness of the second adhesive layer 322 is L2, the thickness of the third adhesive layer 341 is L3, and the thickness of the fourth adhesive layer 342 is L4, wherein the ranges of L1, L2, L3, and L4 are all 50-500 μm. Further, the ranges of L1, L2, L3 and L4 are all 80-200 μm.

As one embodiment, the thickness difference between the thickness of the first adhesive layer 321 and the thickness of the second adhesive layer 322 is 0 to 50 μm. Further, the thickness difference between the thickness of the first glue layer 321 and the thickness of the second glue layer 322 is 0-20 μm.

As one embodiment, the thickness difference between the thickness of the third adhesive layer 341 and the thickness of the fourth adhesive layer 342 is 0 to 50 μm. Further, the thickness difference between the thickness of the third adhesive layer 341 and the thickness of the fourth adhesive layer 342 is 0-20 μm.

As an embodiment, as shown in fig. 2, the thickness of the colloid 3 of the positive electrode ear edge region 31, the negative electrode ear edge region 35, and the intermediate region 33 is B; the thickness of the first adhesive layer 321 is L1, the thickness of the second adhesive layer 322 is L2, the thickness of the third adhesive layer 341 is L3, and the thickness of the fourth adhesive layer 342 is L4; the thickness of the positive electrode lug substrate 1 is A1, and the thickness of the negative electrode lug substrate 2 is A2; wherein l1+a1+l2=b, l3+a2+l4=b. In this embodiment, the thickness of five regions is the same, and the hard head that matches need not to open a groove when encapsulation, and when the size change and the position of anodal ear base member 1, negative pole ear base member 2 take place undulantly, dislocation phenomenon can not appear in utmost point ear base member and groove mark, avoids the groove to press the utmost point ear to appear melting the bad problem of glue, avoids the risk of weeping, has improved the encapsulation effect greatly, has improved the leakproofness after the soft packet battery encapsulation.

As one embodiment, the thickness of the positive electrode tab substrate 1 is A1, and A1 is in the range of 100 to 1000 μm.

As one embodiment, the negative electrode tab substrate 2 has a thickness A2, and A2 ranges from 50 to 1000 μm.

Wherein, A1 and A2 are further determined according to the material selection of the tab substrate.

As an embodiment, as shown in fig. 1, along the width direction Y of the glue 3, the middle part of the glue 3 is a seal area 36 for packaging and bonding the glue 3 and the plastic-aluminum film 5. The width of the seal area 36 is consistent with the width of the seal head, the width of the colloid 3 is D2, the width of the seal area 36 is D1, wherein 0< D2-D1 is less than or equal to 3mm, the width of the seal area 36 is smaller than the width of the colloid 3, namely the width of the seal head is smaller than the width of the colloid 3. During packaging, the edge of the package is at a certain distance from the lug substrate, so that irreversible damage to the surface of the lug substrate is avoided when the high-temperature sealing head is adjacent to the edge of the lug substrate connected with the colloid 3 during hot pressing; and the size of D2-D1 is controlled within 3mm, so that the problem that the adhesive width range of the colloid 3 and the aluminum plastic film 5 is too small to cause unstable adhesion and easy falling is avoided, the sealing effect and stability after encapsulation are ensured, and liquid leakage is prevented.

The utility model also provides a soft package battery, as shown in fig. 3 and 4, which comprises a bare cell 4, an aluminum plastic film 5 and the positive and negative electrode lugs, wherein the bare cell 4 is arranged in the aluminum plastic film 5, the positive and negative electrode lugs are arranged on the same side of the bare cell 4, and one end of the positive electrode lug substrate 1 and one end of the negative electrode lug substrate 2 are connected with the bare cell 4.

As an embodiment, as shown in fig. 3 and 4, the other end of the positive electrode tab substrate 1 and the other end of the negative electrode tab substrate 2 are exposed to the outside of the plastic-aluminum film 5, and electric energy of the internal positive and negative electrodes can be transmitted to an external circuit. During packaging, the colloid 3 and the aluminum plastic film 5 are bonded through heat pressing of the sealing head, and the length of the colloid 3 is greater than or equal to the length of one side of the aluminum plastic film 5, which is packaged.

Specifically, as shown in fig. 3, the length of the colloid 3 is equal to the length of one side of the plastic-aluminum film 5 packaged; as shown in fig. 4, the length of the colloid 3 is longer than the length of the packaging side of the plastic-aluminum film 5. When the bare cell 4 is packaged, the matched sealing heads are hard sealing heads, the surfaces are smooth, the length of the colloid 3 is greater than or equal to the length of one side of the aluminum plastic film 5 packaged, the thickness of the sealing area 36 is B, slotting on the hard sealing heads is not needed, the whole packaged thickness is consistent after packaging, different standards are not needed to be set in a partition, and the on-site management and control are more convenient; the sealing performance of the packaging part and the surrounding connection parts can be ensured, and the risk of liquid leakage is reduced. Further, the hard sealing head is made of steel, copper, alloy and other metals. When the end enclosure seals the tab, the target seal thickness is achieved through limiting or servo.

The beneficial effects of the utility model are as follows:

(1) The thicknesses of all areas at the joint of the positive electrode lug substrate 1, the negative electrode lug substrate 2 and the colloid 3 are basically consistent, a matched hard sealing head does not need to be grooved during packaging, and the sealing head has a simple structure; when the size change and the placement position of the positive electrode lug substrate 1 and the negative electrode lug substrate 2 fluctuate, the dislocation phenomenon of the electrode lug substrate and the groove mark cannot occur, the problem that the glue melting is poor when the groove mark presses the electrode lug is avoided, and the risk of liquid leakage is avoided; simultaneously, the electrode lugs with different specification widths can be considered;

(2) The whole thickness of the packaged package is basically consistent, different standards are not required to be set up in a partition mode, and on-site management and control are more convenient;

(3) An intermediate zone 33 formed by a glue layer is added between the positive electrode lug zone 32 and the negative electrode lug zone 34, the glue layer is extruded to the side during heat sealing, the glue layer of the aluminum plastic film 5 is filled, and the risk that the aluminum plastic film 5 is exposed after being scalded is avoided.

Examples 1-4 and conventional comparative examples:

the thickness of each region of examples 1-4 and conventional comparative examples is shown in Table 1:

table 1 thickness of five areas of examples and conventional comparative examples

And (3) preparation of a soft package battery:

(1) taking 100 lugs of the examples 1-4 and the conventional comparative example respectively, and using bare cells with the same specification to finish welding, namely finishing the preparation of the bare cells;

(2) and packaging the bare cell and the 153 mu m aluminum plastic film, designing the deformation of the adhesive layer in the electrodeless lug area according to 20%, and recording the situation of stamping the electrode lug by the seal head groove of each case.

Soft package battery test:

and respectively carrying out packaging seal thickness test, packaging tensile test, glue melting color contrast and insulation test on the prepared soft package battery, wherein test items, test methods and standards are shown in table 2, and test results are shown in table 3.

Table 2 test items, test methods and criteria for examples and conventional comparative examples

Table 3 test results for examples and conventional comparative examples

In summary, as can be seen from table 3, the yields of the package seal thickness test, the package tension test, the melt color comparison, and the insulation test of examples 1 to 4 all reached 100%, while the yield of the insulation test of the conventional comparative example was only 98%. Therefore, after the positive and negative electrode lugs and the aluminum plastic film are packaged, the soft package battery has better performance, good sealing performance and 100 percent of yield of each test data.

The present utility model is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims (9)

1. The positive and negative electrode lugs are characterized by comprising a positive electrode lug substrate (1), a negative electrode lug substrate (2) and a colloid (3); along the length direction (X) of the colloid (3), the positive electrode lug base body (1) and the negative electrode lug base body (2) are arranged at intervals and fixedly connected with the colloid (3), and two ends of the colloid (3) extend out of the positive electrode lug base body (1) and the negative electrode lug base body (2);

along the length direction (X) of the colloid (3), the positive and negative electrode lugs comprise five areas, namely a positive electrode lug edge area (31), a positive electrode lug area (32), a middle area (33), a negative electrode lug area (34) and a negative electrode lug edge area (35);

the positive electrode lug edge area (31) is positioned in an area close to the positive electrode lug substrate (1) and far away from the negative electrode lug substrate (2), and the positive electrode lug edge area (31) comprises a colloid (3);

the negative electrode lug edge area (35) is positioned in an area close to the negative electrode lug base body (2) and far away from the positive electrode lug base body (1), and the negative electrode lug edge area (35) comprises a colloid (3);

the middle area (33) is positioned in the area between the positive electrode lug substrate (1) and the negative electrode lug substrate (2), and the middle area (33) comprises a colloid (3);

the positive electrode lug area (32) is positioned in an area between the positive electrode lug edge area (31) and the middle area (33), and the positive electrode lug area (32) comprises the colloid (3) and the positive electrode lug substrate (1);

the negative electrode ear region (34) is positioned in a region between the middle region (33) and the negative electrode ear edge region (35), and the negative electrode ear region (34) comprises the colloid (3) and the negative electrode ear substrate (2);

wherein the thickness difference between any two regions of the positive electrode tab edge region (31), the positive electrode tab region (32), the intermediate region (33), the negative electrode tab region (34) and the negative electrode tab edge region (35) is in the range of 0-100 μm.

2. The positive and negative electrode tab according to claim 1, wherein the colloid (3) of the positive electrode tab region (32) includes a first adhesive layer (321) and a second adhesive layer (322), the first adhesive layer (321) being disposed on one side of the surface of the positive electrode tab substrate (1) along the thickness direction (Z) of the colloid (3), the second adhesive layer (322) being disposed on the other side surface opposite to the one side of the surface of the positive electrode tab substrate (1);

the colloid (3) of negative pole ear district (34) includes third glue film (341) and fourth glue film (342), follows colloid (3) thickness direction (Z), third glue film (341) set up one side on negative pole ear base member (2) surface, fourth glue film (342) set up with negative pole ear base member (2) surface opposite side surface.

3. The positive and negative electrode tab according to claim 2, wherein the thickness of the first adhesive layer (321) is L1, the thickness of the second adhesive layer (322) is L2, the thickness of the third adhesive layer (341) is L3, and the thickness of the fourth adhesive layer (342) is L4, wherein L1, L2, L3, L4 are all in the range of 50-500 μm.

4. The positive and negative electrode tab according to claim 2, wherein a thickness difference between the thickness of the first adhesive layer (321) and the thickness of the second adhesive layer (322) is 0-50 μm; and/or the thickness difference between the thickness of the third glue layer (341) and the thickness of the fourth glue layer (342) is 0-50 μm.

5. The positive and negative electrode tab according to claim 2, wherein the thickness of the colloid (3) of the positive electrode tab edge region (31), the negative electrode tab edge region (35) and the intermediate region (33) is B; the thickness of the first adhesive layer (321) is L1, the thickness of the second adhesive layer (322) is L2, the thickness of the third adhesive layer (341) is L3, and the thickness of the fourth adhesive layer (342) is L4; the thickness of the positive electrode lug substrate (1) is A1, and the thickness of the negative electrode lug substrate (2) is A2; wherein l1+a1+l2=b, l3+a2+l4=b.

6. The positive and negative electrode tab according to claim 1, wherein the thickness of the positive electrode tab substrate (1) is A1, A1 being in the range of 100-1000 μm; and/or the thickness of the negative electrode ear substrate (2) is A2, and the range of A2 is 50-1000 mu m.

7. The positive and negative electrode tab according to any one of claims 1 to 6, wherein, along a width direction (Y) of the colloid (3), a seal area (36) is formed in a middle of the colloid (3) for packaging and bonding the colloid (3) and the aluminum plastic film (5), a width of the colloid (3) is D2, and a width of the seal area (36) is D1, wherein 0< D2-D1 is less than or equal to 3mm.

8. The soft package battery is characterized by comprising a bare cell (4), an aluminum plastic film (5) and the positive and negative electrode lugs according to any one of claims 1-7, wherein the bare cell (4) is arranged in the aluminum plastic film (5), the positive and negative electrode lugs are arranged on the same side of the bare cell (4), and one end of a positive electrode lug substrate (1) and one end of a negative electrode lug substrate (2) are connected with the bare cell (4).

9. The soft package battery according to claim 8, wherein the other end of the positive electrode tab substrate (1) and the other end of the negative electrode tab substrate (2) are exposed out of the aluminum plastic film (5), the colloid (3) and the aluminum plastic film (5) are bonded through sealing head encapsulation, and the length of the colloid (3) is greater than or equal to the length of one side of the aluminum plastic film (5) encapsulation.