CN211907571U - Utmost point ear subassembly, laminate polymer battery and battery module - Google Patents

Abstract

The utility model belongs to the technical field of the battery, a utmost point ear subassembly, laminate polymer battery and battery module are disclosed. The tab assembly comprises a terminal, a sealing structure and a tab, wherein a fixing groove is formed in the sealing structure and used for fixing the terminal, and a terminal part is embedded in the fixing groove; the pole lug is arranged on one side face, deviating from the terminal, of the sealing structure, and the pole lug part penetrates through the sealing structure to be connected with the terminal. The soft package battery using the tab assembly does not need a battery support to fix the tab when the module is welded in groups, can be directly welded with the module bus bar, cancels the support mounting, and promotes the grouping efficiency of the battery module. Simultaneously, the terminal is fixed by the fixed slot earlier, realizes pre-buried effect in advance, then when utmost point ear installation, the terminal can play supplementary utmost point ear fixed effect for utmost point ear location is stable, is difficult to dislocation, skew, and utmost point ear need not bend, and the plane degree is good, thereby guarantees the reliability of connecting.

Description

Utmost point ear subassembly, laminate polymer battery and battery module

Technical Field

The utility model relates to the technical field of batteries, especially, relate to utmost point ear subassembly, laminate polymer battery and battery module.

Background

The soft-package power battery is widely applied to the market at present, wherein the lug of the soft-package power battery is a metal sheet adopting a flat sheet structure, the metal sheet penetrates through a sealing structure and is welded with an internal positive pole and a negative pole, and when a battery module is welded in a group mode, the lug exposed outside the battery is welded with a confluence sheet, so that series connection or parallel connection between the batteries is realized.

Because the utmost point ear of flat sheet structure is soft and easy skew partially, when the assembled battery module, need increase the tool and to the fixed of utmost point ear for battery module's efficiency in groups is lower. Simultaneously, when the welding, the utmost point ear of flat sheet structure is buckled easily, can't guarantee the plane degree after utmost point ear is buckled for the plane degree of utmost point ear is relatively poor, influences the welding effect, and the welding quality reliability that leads to the battery module of combination is lower. In addition, the exposed length of the tabs of the existing soft package battery is at least more than 15mm, the sum of the two sides of the positive and negative tabs is 30mm, and the exposed portions of the tabs waste the internal space of the battery.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a utmost point ear subassembly, laminate polymer battery and battery module improve efficiency and welding reliability in groups.

To achieve the purpose, the utility model adopts the following technical proposal:

a tab assembly comprises a terminal, a sealing structure and a tab, wherein a fixing groove is formed in the sealing structure and used for fixing the terminal, and a terminal part is embedded in the fixing groove; the pole lug is arranged on one side face, deviating from the terminal, of the sealing structure, and the pole lug part penetrates through the sealing structure to be connected with the terminal.

Preferably, the end face of the terminal protrudes beyond the end face of the sealing structure by a distance of less than 5 mm.

Preferably, the thickness of the terminal is 1.5mm to 5 mm.

Preferably, the sealing structure includes: the terminal comprises a first sealing layer and a second sealing layer, wherein the first sealing layer is wrapped on the terminal, and at least one layer of the second sealing layer is wrapped on the periphery of the first sealing layer in a superposition mode.

Preferably, the melting point of the second sealing layer is lower than the melting point of the first sealing layer.

Preferably, the cross section of the tab is of a T-shaped structure.

Preferably, the tab includes:

the tab body is arranged on one side surface of the sealing structure, which is far away from the terminal;

and the bulge part is convexly arranged on one side of the lug body close to the sealing structure, and at least part of the bulge part penetrates through the sealing structure and is connected with the terminal.

Preferably, the width of the second sealing layer is L, the thickness of the first sealing layer is B, wherein 50mm < L < 150mm, B < 20mm, and 2.5 < L/B < 80.

In order to achieve the purpose, the utility model also provides a laminate polymer battery, including foretell utmost point ear subassembly.

In order to achieve the purpose, the utility model also provides a battery module, including foretell laminate polymer battery.

The utility model has the advantages that:

the utility model provides a utmost point ear subassembly, through having seted up the fixed slot on seal structure, the fixed slot is used for holding the terminal, the fixed slot has played the effect of fixed terminal for when utmost point ear is connected with the terminal, the terminal has fixed the setting in the fixed slot, the terminal is fixed knot structure, compare with prior art, use this utmost point ear subassembly's laminate polymer battery, need not to reuse battery holder fixed utmost point ear when the battery welds in groups, can directly weld with the module piece that converges, cancelled the support mounting, promoted battery module efficiency in groups. Simultaneously, the terminal is fixed by the fixed slot earlier, realizes pre-buried effect in advance, then when utmost point ear installation, the terminal can play supplementary utmost point ear fixed effect for utmost point ear location is stable, is difficult to dislocation, skew, and replace traditional utmost point ear that exposes with smooth terminal, makes laminate polymer battery need not to buckle utmost point ear when carrying out in groups, and sufficient roughness can be guaranteed to smooth terminal simultaneously, thereby guarantees the reliability of connecting. In addition, the terminal part is embedded in the fixing groove, so that the terminal adopts a convex, concave and parallel and level structure, the structure is simple, the manufacturing process is mature and stable, the terminal can be optimized on the existing basis, the terminal is convenient to use, and the tab is integrated on the terminal to replace the traditional exposed tab, thereby being beneficial to improving the space utilization rate of the battery.

The utility model also provides a laminate polymer battery, including foretell utmost point ear subassembly, the seal structure department of plastic-aluminum membrane and utmost point ear subassembly seals to assemble laminate polymer battery, it is efficient in groups when assembling the module.

The utility model also provides a battery module, including foretell laminate polymer battery, the plane degree is good, and welding stability is good, and the quality is good.

Drawings

Fig. 1 is a side view of a tab assembly of the present invention;

fig. 2 is a schematic view of the terminal of the tab assembly of the present invention with the end surface flush with the end surface of the seal structure;

fig. 3 is a schematic view showing the end surface of the terminal in the tab assembly being recessed relative to the end surface of the sealing structure according to the present invention;

fig. 4 is a schematic view showing that the end face of the terminal in the tab assembly of the present invention protrudes relative to the end face of the sealing structure.

In the figure:

1. a terminal; 2. a sealing structure; 3. fixing grooves; 4. a tab;

21. a first sealing layer; 22. and a second sealing layer.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Because current laminate polymer battery's shell intensity is low, and utmost point ear 4's thickness is thinner, appears warping easily, simultaneously, generally need set up tools such as support when laminate polymer battery is in groups and protect to fixing utmost point ear 4, the efficiency in groups that leads to the battery module is lower, and go back to weld again after utmost point ear 4 need buckle when in groups, and the roughness is relatively poor, in addition, expose in the utmost point ear 4 of casing and set up greatly reduced laminate polymer battery's inner space utilization. In order to solve this problem, the present embodiment provides a tab assembly, as shown in fig. 1-2, the tab assembly includes a terminal 1, a sealing structure 2, and a tab 4, a fixing groove 3 is formed on the sealing structure 2, the fixing groove 3 is used for accommodating and fixing the terminal 1, and the terminal 1 is partially embedded in the fixing groove 3. The pole ear 4 is arranged on one side surface of the sealing structure 2, which is far away from the terminal 1, and the pole ear 4 partially penetrates through the sealing structure 2 to be connected with the terminal 1, so that an integral structure is formed. As shown in fig. 2 to 4, the thickness of the terminal 1 may be greater than or equal to or less than the groove depth of the fixing groove 3 so that the end face of the terminal 1 is disposed flush with or protruding or recessed with respect to the end face of the sealing structure 2.

The utmost point ear subassembly that this embodiment provided, through fixed slot 3 has been seted up on seal structure 2, fixed slot 3 is used for holding terminal 1, fixed slot 3 has played the effect of fixed terminal 1, when making utmost point ear 4 be connected with terminal 1, terminal 1 has fixed the setting in fixed slot 3, terminal 1 is fixed knot to be constructed, compared with the prior art, use the laminate polymer battery of this utmost point ear subassembly, need not to reuse battery support fixed utmost point ear 4 when the battery welds in groups, can directly weld with the module piece that converges, the support mounting has been cancelled, the battery module efficiency in groups has been promoted. Simultaneously, terminal 1 is fixed by fixed slot 3 earlier, realizes pre-buried effect in advance, then when utmost point ear 4 installs, terminal 1 can play supplementary utmost point ear 4 fixed effect for utmost point ear 4 location is stable, is difficult to the dislocation, the skew, and with level and smooth terminal 1 replace traditional utmost point ear 4 that exposes, make laminate polymer battery need not to buckle utmost point ear 4 when carrying out in groups, level end simultaneously, 1 can guarantee sufficient roughness, thereby guarantee the reliability of connecting. In addition, terminal 1 part inlays locates in fixed slot 3 for terminal 1 adopts the structure of protrusion, indent and parallel and level, simple structure, and the preparation technology is ripe and stable, can optimize on current basis, and it is convenient to use, moreover, with utmost point ear 4 integration on terminal 1, replaces traditional utmost point ear 4 that exposes, is favorable to improving the space utilization of battery.

The number of the tabs 4 is at least one, that is, the tabs 4 may be one or two or more, and the tabs 4 may be arranged in a single-layer structure or a multi-layer structure. It is understood that the connection portion between the tab 4 and the terminal 1 may be a welded connection, or may be a stamping or bending formation, and it is within the protection scope of the present embodiment as long as the stable connection between the tab 4 and the terminal 1 can be achieved.

Specifically, the cross section of the tab 4 has a T-shaped structure. Specifically, the tab 4 includes: the tab body is arranged on one side surface of the sealing structure 2, which is far away from the terminal 1; the bulge is convexly arranged on one side of the tab body close to the sealing structure 2, and at least part of the bulge penetrates through the sealing structure 2 and is connected with the terminal 1.

In order to further improve the flatness and stability of the tab 4, the thickness of the terminal 1 is set to 1.5mm to 5mm, preferably 2.0mm to 3.0 mm. Through setting up 1 thickness of terminal for 1.5mm ~ 5mm for the thickness of terminal 1 is about 3-5 times of current laminate polymer battery's utmost point ear 4 thickness, and the thickness of terminal 1 is thicker more at above-mentioned within range, and terminal 1 is difficult more skew and dislocation, then utmost point ear 4 is also difficult to warp thereupon, and the plane degree is good, leads to overall structure stable, and welding stability is just better, thereby improves the welding qualification rate.

The exposed length of the conventional tab 4 is large, so that the space utilization rate of the battery is reduced. In order to solve the problem, when the end surface of the terminal 1 provided by this embodiment is flush with or recessed relative to the end surface of the sealing structure 2, the end surface of the terminal 1 will not be exposed, and at this time, the exposed size of the terminal 1 is 0 mm; when the terminal surface at terminal 1 set up for seal structure 2's terminal surface protrusion, the terminal surface of terminal 1's terminal surface protrusion seal structure 2's terminal surface apart from being less than 5mm, exposes the size and is less than traditional laminate polymer battery far away, can effectively improve battery module's space utilization.

Since the terminal 1 is disposed in the fixing groove 3 of the sealing structure 2, the sealing structure 2 can protect the terminal 1. Preferably, the sealing structure 2 includes at least two sealing layers, the sealing layer located at the inner layer covers the terminal 1, and the sealing layer located at the outer layer covers the sealing layer located at the inner layer adjacent thereto. Through the mutual cooperation of the inner sealing layer and the outer sealing layer, the protection effect on the terminal 1 is further improved.

Further, the width of the sealing layer positioned on the outermost layer is L, and the thickness of the sealing layer positioned on the outermost layer is B, wherein L is more than 50mm and less than 150mm, B is less than 20mm, and L/B is more than 2.5 and less than 80. Through the arrangement, the sealing structure 2 does not occupy larger space while ensuring the protection terminal 1, so that the structure is more compact and reasonable.

It can be understood that, in this embodiment, the shape of the sealing layer is not limited, and both ends of the sealing layer are in an arc-shaped structure or a square structure, so that the structure is flexible and the use is convenient. Each sealing layer is made of one or more mixed polymer materials or composite polymer materials, such as PP, PE, PEN, fiber and the like.

Since the sealing layer located at the innermost layer is directly in contact with the terminal 1, the terminal 1 may have a high temperature during actual use, and therefore, the melting point of the sealing layer located at the innermost layer may be set higher than that of the sealing layer located at the outer layer to improve safety performance. Specifically, the high-melting-point material of the sealing layer may be a polymer material, or may be a plurality of mixed or composite polymer materials; the low-melting-point material of the sealing layer can be a high polymer material, and can also be a plurality of mixed or composite high polymer materials.

In the sealing structure 2 of the present embodiment, two sealing layers are taken as an example, as shown in fig. 1 to 4, the first sealing layer 21 and the second sealing layer 22 are provided, the first sealing layer 21 covers the terminal 1, so that the terminal 1 is located at the central position of the first sealing layer 21, at least one layer of the second sealing layer 22 covers the periphery of the first sealing layer 21 in a superposition manner, the first sealing layer 21 is located at the innermost side, the second sealing layer 22 is located at the outermost side, the second sealing layer 22 is arranged around the first sealing layer 21, and the second sealing layer 22 plays a role in reinforcing and protecting the terminal 1. Since the first sealing layer 21 is in direct contact with the terminal 1, the melting point of the first sealing layer 21 may be set higher than that of the second sealing layer 22.

The width of the second sealing layer 22 is L, the thickness of the first sealing layer 21 is B, wherein L is more than 50mm and less than 150mm, B is less than 20mm, and L/B is more than 2.5 and less than 80. The first sealant 21 and the second sealant 22 are made of any one of PP, PE, PEN, or fiber.

It should be noted that the tab assembly is generally divided into a positive tab assembly and a negative tab assembly, and the positive tab assembly and the negative tab assembly have substantially the same structure but different materials. Specifically, the terminal 1 and the tab 4 of the positive electrode tab assembly can be made of aluminum metal and the like, and the terminal 1 and the tab 4 of the negative electrode tab assembly can be made of copper sheets, copper nickel-plated sheets, copper nickel composite sheets, nickel sheets and the like.

The utility model also provides a laminate polymer battery, including foretell utmost point ear subassembly, 2 departments of seal structure of plastic-aluminum membrane and utmost point ear subassembly seal to assemble laminate polymer battery, it is efficient in groups when assembling the module.

This embodiment still provides a battery module, including foretell laminate polymer battery, the plane degree is good, and welding stability is good, and the quality is good.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are used in an orientation or positional relationship based on that shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. The tab assembly is characterized by comprising a terminal (1), a sealing structure (2) and a tab (4), wherein a fixing groove (3) is formed in the sealing structure (2), the fixing groove (3) is used for fixing the terminal (1), and the terminal (1) is partially embedded in the fixing groove (3); the tab (4) is arranged on one side face, deviating from the terminal (1), of the sealing structure (2), and the tab (4) partially penetrates through the sealing structure (2) and the terminal (1) to be connected.

2. A tab assembly as claimed in claim 1, wherein the end face of the terminal (1) protrudes beyond the end face of the sealing structure (2) by a distance of less than 5 mm.

3. The tab assembly as claimed in claim 1, wherein the terminal (1) has a thickness of 1.5mm to 5 mm.

4. A tab assembly as claimed in claim 1, wherein the sealing structure (2) comprises: the terminal comprises a first sealing layer (21) and a second sealing layer (22), wherein the first sealing layer (21) is coated on the terminal (1), and at least one layer of the second sealing layer (22) is coated on the periphery of the first sealing layer (21) in a superposition mode.

5. The tab assembly as claimed in claim 4, wherein the second sealing layer (22) has a melting point less than that of the first sealing layer (21).

6. The tab assembly as claimed in claim 1, wherein the cross section of the tab (4) is a T-shaped structure.

7. The tab assembly as claimed in claim 6, wherein the tab (4) comprises:

the tab body is arranged on one side surface of the sealing structure (2) departing from the terminal (1);

the lug body is arranged on one side, close to the sealing structure (2), of the lug body in a protruding mode, and at least part of the lug body penetrates through the sealing structure (2) and is connected with the terminal (1).

8. The tab assembly of claim 4 wherein the second sealing layer (22) has a width L and the first sealing layer (21) has a thickness B, wherein 50mm < L < 150mm, B < 20mm, 2.5 < L/B < 80.

9. A soft package battery, characterized by comprising the tab assembly of any one of claims 1-8.

10. A battery module comprising the pouch battery according to claim 9.

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