A gummy battery structure and a square aluminum shell battery

Abstract

The utility model belongs to the battery manufacturing technical field, concretely relates to a kind of rubber pasting battery structure and square aluminium shell battery.It includes two or more battery packs, the battery pack is outwardly extended and is provided with tab;The tab of adjacent battery pack is connected by the connecting piece welded therewith;It further includes the rubber pasting that is simultaneously close to battery pack and tab, so that the interval part of uncovered rubber pasting is formed between tab and connecting piece.The utility model sets the interval part of uncovered rubber pasting between tab and connecting piece by optimizing traditional rubber pasting structure, in the case where guaranteeing the function of original rubber pasting structure, the pulling of tab by rubber pasting when tab is bent is avoided, and simultaneously by the double bending of tab set between connecting piece and battery pack, two layers of insulation structure are formed between connecting piece and battery pack.The utility model structure is simple, and the original rubber pasting equipment is simply transformed to be implemented, and it is suitable for the popularization and application in production practice.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing technology, specifically relating to an adhesive-coated battery structure and a square aluminum-cased battery. Background Technology

[0002] Square aluminum-cased batteries are lithium-ion secondary batteries that use an aluminum alloy casing as the packaging carrier and employ a wound or stacked electrode design. Their regular rectangular structure offers advantages such as high mechanical strength, excellent space utilization, and strong adaptability to battery pack configurations, making them the mainstream packaging form for new energy vehicle power batteries and energy storage systems.

[0003] In square aluminum-cased batteries, the adhesive bonding process between the tabs and the battery pack (or module) and connecting tabs is a crucial step in ensuring battery safety, reliability, and performance stability. For example, the tab bonding structure, battery module, and battery pack disclosed in patent CN 220604923 U involve bonding the adhesive film to the core pack structure and the tab structure, with the film located away from the connecting tabs. This structure reduces the breakage rate of the tabs. After the battery pack is bonded, it needs to be folded and sealed. It can be observed that in this technical solution, after folding, there is no insulation treatment between the bent tabs and the battery pack. Since common battery packs are of a wound core structure, when the battery pack is sealed, a downward pressure is applied to the connecting tabs, causing the tabs to come into contact with the battery pack, which can easily lead to a short circuit.

[0004] To prevent short circuits caused by downward pressure on the tabs, a battery tab structure and soft-pack button battery disclosed in patent CN 216928870 U abandons the traditional adhesive bonding structure and achieves the effect of preventing short circuits by setting a sealant layer on the tab surface. However, this technical solution adds a new step to battery manufacturing, and the efficiency of setting the sealant layer is far less than that of the traditional adhesive bonding process. Furthermore, the thickness of the sealant layer also affects the product's size, making it difficult to apply in production practice. Therefore, there is an urgent need to improve the traditional adhesive bonding process and solve the problem of short circuits caused by the traditional adhesive bonding structure. Utility Model Content

[0005] The present invention aims to overcome the defect in the prior art where the tabs of the battery are prone to short circuits due to contact with the battery pack after battery encapsulation, and provides an adhesive battery structure and a square aluminum-cased battery to overcome the above defects.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] An adhesive-bonded battery structure includes two or more battery packs, wherein the battery packs are provided with tabs extending outwards;

[0008] The tabs of adjacent battery packs are connected by connecting pieces welded to them;

[0009] It also includes adhesive tape that is in close contact with the battery pack and the tabs, so that there is a gap between the tabs and the connecting piece that is not covered by adhesive tape.

[0010] Most common power batteries nowadays use a stacked or wound design, forming a battery pack by alternating positive electrode sheets, separators, and negative electrode sheets. On one side of the battery pack, tabs extend outwards from the same electrode sheet, serving the functions of power transmission and structural connection. Due to the large number of electrode sheets, the extended tabs form clusters, and these tabs are usually welded to connecting plates to achieve electrical connection between multiple battery packs. In existing technologies, after the tabs are welded to the connecting plates, an adhesive application process is typically performed. The adhesive application structure mainly undertakes core functions such as electrode assembly fixation, insulation protection, and shock absorption. The traditional adhesive application process involves sequentially covering the battery pack, tabs, and connecting plates with adhesive. However, in practice, it has been found that because the battery pack needs to be placed vertically side-by-side, the tabs may bend between the connecting plates and the battery pack. Since the adhesive often lacks sufficient elasticity due to functional requirements, the adhesive near the connecting plates can pull on the tabs, making the outer tabs looser. When a force is applied to the connecting piece toward the battery pack, a gap will be created between the tab and the adhesive. If the tab comes into direct contact with the battery pack in this gap, a short circuit will occur, which will seriously affect the yield rate of the power battery assembly and the stability of the power battery during use.

[0011] Therefore, this utility model forms an uncovered gap between the tab and the connecting piece. Since the adhesive does not cover the connecting piece, the tab will not be pulled when it is bent, and space is provided for the deformation of the adhesive, so that the adhesive can still stick tightly to the tab, thereby forming an insulating layer between the tab and the battery pack to prevent short circuits.

[0012] Preferably, the width of the spacer is 1 to 10 mm.

[0013] Preferably, the electrodes are clustered and bent in the direction of the battery pack to form a first bending portion, and a second bending portion is provided between the first bending portion and the connecting piece; the bending directions of the first bending portion and the second bending portion are opposite. By setting two bending points, the space utilization is maximized, making it less likely for the electrodes to loosen during the packaging process. At the same time, the two bending points form a double-layer adhesive structure between the electrodes and the battery pack, improving the insulation effect.

[0014] Preferably, the side of the tab away from the adhesive patch is also provided with a second adhesive patch that simultaneously covers the battery pack, the tab, and the connecting piece.

[0015] Preferably, the adhesive tape has a redundant portion that extends beyond the width of the tab. Since in practice the adhesive tape is wider than the tab, the redundant portion of the tape can improve the overall stability of the battery pack by adhering it to the battery pack.

[0016] Preferably, the connecting piece includes two connecting portions for welding tabs, and a protrusion disposed between the connecting portions. The connecting portions and the protrusion create a U-shaped overall structure on the plane of the connecting piece. The connecting portions facilitate welding the tabs to the connecting piece, while the protrusion facilitates subsequent welding of the electrode to the connecting piece.

[0017] As a further preferred embodiment, the connecting piece is provided with a recess corresponding to the protrusion. Since the battery requires a subsequent electrolyte filling process, the recess can provide space for the electrolyte filling hole in the subsequent process.

[0018] On the other hand, the present invention also discloses a square aluminum-cased battery, comprising a square aluminum casing that covers the above-mentioned adhesive battery structure.

[0019] Preferably, the square aluminum shell is provided with electrodes corresponding to the connecting pieces.

[0020] Preferably, the battery pack has an auxiliary adhesive patch on the side away from the tabs. The purpose of the auxiliary adhesive patch is to further secure the multiple battery packs.

[0021] Therefore, this utility model has the following beneficial effects:

[0022] (1) By optimizing the traditional adhesive structure, this utility model sets an uncovered adhesive gap between the electrode tab and the connecting piece. While ensuring the function of the original adhesive structure, it avoids the pulling of the electrode tab by the adhesive when the electrode tab is bent, and effectively avoids the occurrence of short circuit.

[0023] (2) This utility model saves space as much as possible by setting a double bending structure of the tab between the connecting piece and the battery pack, and at the same time forms two layers of insulation structure between the connecting piece and the battery pack.

[0024] (3) This utility model improves upon the traditional adhesive application structure. The structure is simple and can be implemented by simply modifying the original adhesive application equipment. It is suitable for promotion and application in production practice. Attached Figure Description

[0025] Figure 1 This is a connection diagram of an adhesive battery structure according to Embodiment 1 of this utility model.

[0026] Figure 2 This is a schematic diagram of a connecting piece for an adhesive battery structure according to Embodiment 1 of this utility model.

[0027] Figure 3 This is a schematic diagram of the installation of an adhesive battery structure according to Embodiment 1 of this utility model.

[0028] Figure 4 This is a bending diagram of an adhesive battery structure according to Embodiment 1 of this utility model.

[0029] Figure 5 This is a schematic diagram of the structure of a square aluminum-cased battery according to Embodiment 2 of this utility model.

[0030] In the figure: 1. Battery pack; 2. Electrode; 3. Connecting piece; 4. Adhesive; 5. Spacer; 6. Second adhesive; 7. Square aluminum shell; 8. Electrode; 9. Auxiliary adhesive; 10. First bend; 20. Second bend; 31. Connecting part; 32. Protrusion; 33. Recess; 41. Redundancy. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0032] Example 1:

[0033] like Figure 1 As shown, an adhesive battery structure of this embodiment includes two battery packs 1, each battery pack 1 extending outwards with tabs 2 containing positive and negative electrodes. The two battery packs 1 are placed on the same plane such that the tabs 2 of the same polarity correspond to each other, and the tabs 2 of the same polarity are connected to each other by connecting pieces 3. Figure 2 The diagram shows the connecting piece 3 of this embodiment. The connecting piece 3 is generally rectangular, with its shorter side serving as a connecting portion 31 for welding to the electrode tab 2. One of its longer sides protrudes outward to form a protrusion 32, and the other longer side is recessed inward in a semi-circular shape to form a concave portion 33. This makes the connecting piece 3 generally "U"-shaped. This structure facilitates subsequent welding processes while maintaining the physical strength and conductivity of the connecting piece 3 despite its reduced weight. After the edge of the electrode tab 2 is welded to the connecting portion 31 on the connecting piece 3, as... Figure 3 As shown, the adhesive application process is performed using a pressing device. One end of the adhesive sticker 4 is tightly attached to the battery pack 1, and under the action of the pressing device, it is then tightly attached to the tab 2. At the same time, a gap 5 is formed on the tab 2 that is not covered by the adhesive sticker 4. Since the adhesive sticker 4 is wider than the tab 2, a redundant portion 41 is formed at the edge of the adhesive sticker 4. Then, the battery pack 1 is flipped over as a whole, and a second adhesive sticker 4 is pasted on the other side so that the second adhesive sticker 4 covers the battery pack 1, the tab 2, and the connecting piece 3, thus completing the adhesive application process.

[0034] like Figure 4As shown, after the adhesive application process is completed, the battery pack 1 is bent towards the second adhesive patch 4, so that the two battery packs 1 are placed side by side vertically. At this time, a downward force is applied to the connecting piece 3 to compress the space between the connecting piece 3 and the battery pack 1. At this time, under the action of the adhesive patch 4, the tab 2 forms a first bent portion 10 near the battery pack 1. Then, due to the setting of the spacer 5, space is provided for the bending of the tab 2, so that the tab 2 forms a second bent portion 20 in the opposite direction to the first bent portion 10 between the first bent portion 10 and the connecting piece 3. It can be seen that under the pressure of the second bent portion 20, the adhesive patch 4 can better adhere to the first bent portion 10, so that there are two layers of adhesive patch 4 between the tab 2 and the battery pack 1, which can achieve a better insulation effect.

[0035] Example 2:

[0036] A type of square aluminum-cased battery, such as Figure 5 As shown, the battery includes the adhesive battery structure described in Embodiment 1 and a square aluminum shell 7 covering the adhesive battery structure. Before encapsulating the battery pack 1 into the square aluminum shell 7, auxiliary adhesive tape 9 is attached to the side of the battery pack 1 away from the tab 2 to further fix the two battery packs 1. Furthermore, the top of the square aluminum shell 7 is provided with an electrode 8 corresponding to the connecting piece 3. By welding the electrode 8 to the connecting piece 3 and then encapsulating the square aluminum shell 7, the installation of the square aluminum shell battery in this embodiment is completed.

[0037] The embodiments of this specification have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technological improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An adhesive-coated battery structure, characterized in that: It includes two or more battery packs (1), and the battery packs (1) are provided with tabs (2) extending outward. The tabs (2) of adjacent battery packs (1) are connected by connecting pieces (3) welded to them; It also includes an adhesive tape (4) that is in close contact with the battery pack (1) and the tab (2), so that a gap (5) is formed between the tab (2) and the connecting piece (3) that is not covered by the adhesive tape (4).

2. The adhesive battery structure according to claim 1, characterized in that: The width of the interval (5) is 1~10mm.

3. The adhesive battery structure according to claim 1, characterized in that: The tabs (2) are clustered and bent toward the battery pack (1) to form a first bending portion (10), and a second bending portion (20) is provided between the first bending portion (10) and the connecting piece (3); the bending directions of the first bending portion (10) and the second bending portion (20) are opposite.

4. The adhesive battery structure according to claim 1, characterized in that: The tab (2) is provided with a second adhesive strip (6) on the side away from the adhesive strip (4) that simultaneously covers the battery pack (1), the tab (2) and the connecting piece (3).

5. The adhesive battery structure according to claim 1, characterized in that: The adhesive (4) has a redundant portion (41) that exceeds the width of the tab (2).

6. The adhesive battery structure according to claim 1, characterized in that: The connecting piece (3) includes two connecting portions (31) for welding the electrode tabs (2) and a protrusion (32) disposed between the connecting portions (31).

7. The adhesive battery structure according to claim 6, characterized in that: The connecting piece (3) is provided with a concave portion (33) corresponding to the protrusion (32).

8. A square aluminum-cased battery, characterized in that: It includes a square aluminum shell (7) that covers the adhesive battery structure as described in any one of claims 1-7.

9. A square aluminum-cased battery according to claim 8, characterized in that: The square aluminum shell (7) is provided with electrodes (8) corresponding to the connecting piece (3).

10. A square aluminum-cased battery according to claim 8, characterized in that: An auxiliary adhesive sticker (9) is provided on the side of the battery pack (1) away from the tab (2).

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