Pole piece and soft package button cell

Abstract

The utility model discloses a pole piece and a soft-package button cell. The pole piece comprises a pole piece body, the tab is provided with a welding part and an extension part, the welding part is welded on the pole piece body, and the extension part extends from the welding part and is exposed out of the pole piece body in a protruding manner; the tab glue is attached to the extension part, the tab glue is T-shaped glue, the T-shaped glue is provided with a first glue part and a second glue part which are sequentially arranged in the extension direction of the extension part, the width of the second glue part is smaller than that of the first glue part, and the second glue part covers the bent position of the tab. In the pole piece disclosed by the utility model, the tab bending operation is relatively easy and labor-saving.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an electrode sheet and a soft-pack button cell battery. Background Technology

[0002] A soft-pack button cell is a small battery that looks like a button. It is usually composed of a positive electrode, a negative electrode, a separator, an electrolyte, and a soft-pack casing.

[0003] The electrode sheet has a tab welded to it, which is covered with tab adhesive to insulate it from the external environment and extends beyond the soft housing. During the production process, the tab is usually bent to fit as close to the soft housing as possible, thereby saving space and facilitating welding.

[0004] When the tab is bent, the tab adhesive deforms along with the shape of the tab. The tab adhesive is usually a rectangular piece of adhesive paper, and the width of the adhesive paper is much larger than the width of the tab. During the bending process, it will have greater stress at the bending point, which will make the bending operation of the tab difficult. Utility Model Content

[0005] The main purpose of this utility model is to propose an electrode sheet that aims to solve, to some extent, the technical problem of laborious electrode tab bending operations in current soft-pack button cell batteries.

[0006] To achieve the above objectives, this utility model proposes an electrode sheet, which includes:

[0007] pole piece body;

[0008] The electrode tab has a welding part and an extension part, the welding part is welded to the electrode body, and the extension part extends from the welding part and protrudes from the electrode body;

[0009] The tab adhesive is applied to the outer extension portion. The tab adhesive is a T-shaped adhesive, which has a first adhesive portion and a second adhesive portion arranged sequentially along the extension direction of the outer extension portion. The width of the second adhesive portion is smaller than the width of the first adhesive portion, and the second adhesive portion covers the bending position of the tab.

[0010] In some embodiments, the T-shaped adhesive includes a first T-shaped adhesive layer and a second T-shaped adhesive layer, wherein both the first T-shaped adhesive layer and the second T-shaped adhesive layer are formed with a first adhesive portion and a second adhesive portion;

[0011] The first T-shaped adhesive layer and the second T-shaped adhesive layer are located on opposite sides of the extension portion. The first adhesive portion of the first T-shaped adhesive layer is bonded to the first adhesive portion of the second T-shaped adhesive layer, and the second adhesive portion of the second T-shaped adhesive layer is bonded to the second adhesive portion of the second T-shaped adhesive layer.

[0012] In some embodiments, the T-shaped adhesive includes a T-shaped sleeve, which is fitted onto the outer extension portion.

[0013] In some embodiments, the height of the second adhesive portion ranges from 0.6 mm to 1.1 mm.

[0014] In some embodiments, the width of the second adhesive portion is greater than the width of the extension portion.

[0015] In some embodiments, the width of the second adhesive portion extends beyond the width of the extension portion by 0.2 mm to 0.6 mm on one side.

[0016] This utility model also proposes a soft-pack button cell battery, which includes:

[0017] case;

[0018] A core is disposed in the housing, the core comprising an anode electrode, a diaphragm and a cathode electrode arranged in layers and wound together;

[0019] Wherein, at least one of the anode electrode and the cathode electrode includes the electrode as described above.

[0020] In some embodiments, the housing has a sealing area at the point where the tab protrudes, and the second adhesive portion is located outside the sealing area.

[0021] In some embodiments, the first adhesive portion extends beyond the sealing area but does not exceed the thickness space of the housing.

[0022] In some embodiments, along the thickness direction of the core, the side of the second adhesive portion away from the first adhesive portion extends beyond the top of the housing.

[0023] In this invention, the tab adhesive is a T-shaped adhesive. The width of the second adhesive part of the T-shaped adhesive is smaller than the width of the first adhesive part. Furthermore, the second adhesive part covers the bending position of the tab. When the T-shaped adhesive is bent along with the tab, its second adhesive part can bear part of the stress generated by the bending, guiding the stress from the key bending part to other parts, thereby reducing the stress concentration at the bending position and making the stress more effectively dispersed. The tab bending operation is relatively easy and labor-saving. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the electrode sheet in one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a soft-pack button battery in one embodiment of the present invention;

[0026] Explanation of icon numbers:

[0027]

[0028]

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0031] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0033] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0034] Reference Figure 1 , Figure 1 This is a schematic diagram of the electrode sheet in one embodiment of the present invention:

[0035] This utility model embodiment proposes an electrode sheet, such as Figure 1 As shown, the electrode includes:

[0036] Pole piece body 100;

[0037] The electrode tab 200 has a welding portion 210 and an extension portion 220. The welding portion 210 is welded to the electrode body 100, and the extension portion 220 extends from the welding portion 210 and protrudes from the electrode body 100.

[0038] The tab adhesive 300 is attached to the extension portion 220. The tab adhesive 300 is a T-shaped adhesive. The T-shaped adhesive has a first adhesive portion 310 and a second adhesive portion 320 arranged sequentially along the extension direction of the extension portion 220. The width of the second adhesive portion 320 is smaller than the width of the first adhesive portion 310. The second adhesive portion 320 covers the bending position Z of the tab 200.

[0039] The electrode involved in this embodiment can be the electrode of a soft-pack button cell battery. The soft-pack button cell battery is button-shaped, with the positive and negative electrodes located on the top and bottom sides of the battery, respectively. The electrochemical reaction is completed through the internal separator and electrolyte. The button design makes the battery more convenient to install and use, and can well adapt to the space requirements of some small electronic devices.

[0040] The electrode can be either a positive or negative electrode; this embodiment does not impose any limitation on this. A tab 200 is welded to the electrode body 100, and the tab 200 is used for connection to an external circuit. The tab 200 is an elongated tab, with its welding portion 210 and extension portion 220 integrally formed. The tab 200 is located on one side of the electrode body 100 and is welded to the electrode body 100 via its welding portion 210, while its extension portion 220 extends from the welding portion 210 and protrudes from the electrode body 100.

[0041] A tab adhesive 300 is attached to the outer extension 220 of the tab 200. The tab adhesive 300 is attached to the tab 200 and mainly serves to insulate, seal, and fix the tab. The tab adhesive 300 usually has good adhesion and corrosion resistance, which can prevent short circuits between the tab and the battery casing or other components, while ensuring that the electrolyte inside the battery does not leak.

[0042] The tab adhesive 300 is a T-shaped adhesive. A T-shaped adhesive means that the tab adhesive 300 is approximately T-shaped, having a first adhesive portion 310 and a second adhesive portion 320. The second adhesive portion 320 extends from one end of the first adhesive portion 310 and is narrower than the first adhesive portion 310. The first adhesive portion 310 and the second adhesive portion 320 are arranged sequentially along the extending direction of the outer extension 220 of the tab 200.

[0043] The T-shaped adhesive can be obtained by pre-adhering rectangular adhesive paper to the outer extension 220 of the tab 200, and then cutting the rectangular adhesive paper after the battery casing is sealed and before the tab 200 is bent to obtain the T-shaped adhesive. Alternatively, the T-shaped adhesive can be prepared in advance and then adhered to the outer extension 220 of the tab 200.

[0044] Furthermore, the second adhesive portion 320 covers the bending position Z of the tab 200. When the T-shaped adhesive is bent along with the tab 200, its second adhesive portion 320 can bear part of the stress generated by the bending, guiding the stress from the critical bending part to other parts, thereby reducing the stress concentration at the bending position and allowing the stress to be more effectively dispersed. This makes the bending operation of the tab 200 relatively easy and effortless. In other words, this solution optimizes the structural shape of the tab adhesive 300 by using T-shaped adhesive instead of the original rectangular adhesive paper, making the bending of the tab 200 simpler and easier to operate.

[0045] In some embodiments, the T-shaped adhesive includes a first T-shaped adhesive layer and a second T-shaped adhesive layer, both of which have a first adhesive portion 310 and a second adhesive portion 320 formed thereon.

[0046] The first T-shaped adhesive layer and the second T-shaped adhesive layer are located on opposite sides of the extension portion 220. The first adhesive portion 310 of the first T-shaped adhesive layer is bonded to the first adhesive portion 310 of the second T-shaped adhesive layer, and the second adhesive portion 320 of the second T-shaped adhesive layer is bonded to the second adhesive portion 320 of the second T-shaped adhesive layer.

[0047] In this embodiment, the T-shaped adhesive has a double-layer adhesive structure, including a first T-shaped adhesive layer and a second T-shaped adhesive layer. When applying the adhesive, the first T-shaped adhesive layer is bonded to the outer extension 220 of the tab 200 from one side, and the second T-shaped adhesive layer is bonded to the outer extension 220 of the tab 200 from the other side, and the first T-shaped adhesive layer and the second T-shaped adhesive layer are bonded to each other, thereby achieving the coverage of the outer extension 220 of the tab 200.

[0048] In addition to the above structural forms, T-shaped adhesive can also be:

[0049] In some embodiments, the T-shaped adhesive is a T-shaped sleeve, which is fitted onto the outer extension portion 220. In this embodiment, the T-shaped sleeve is an integrally molded sleeve-shaped adhesive. When applying the adhesive, the outer extension portion 220 of the tab 200 is first passed through the T-shaped sleeve, and the T-shaped sleeve is fitted onto the outer extension portion 220 of the tab 200 to cover it. Then, the T-shaped sleeve is flattened so that the T-shaped sleeve and the outer extension portion 220 of the tab 200 are tightly bonded together. The operation is simple and convenient.

[0050] The dimensions (such as width) of the first adhesive portion 310 of the T-shaped adhesive are designed according to the encapsulation requirements, while the dimensions of the second adhesive portion 320 can be:

[0051] In some embodiments, the height of the second adhesive portion 320 ranges from 0.6 mm to 1.1 mm. Specifically, the height of the second adhesive portion 320 can be set within the range of 0.6 mm to 1.1 mm; for example, the height of the second adhesive portion 320 can be set to 0.6 mm, 0.85 mm, or 1.1 mm. Optionally, the height of the second adhesive portion 320 can be set with reference to the size of the tab 200. For example, when the size of the tab 200 is small, the height of the second adhesive portion 320 can be set to 0.6 mm; when the size of the tab 200 is medium, the height of the second adhesive portion 320 can be set to 0.85 mm; and when the size of the tab 200 is large, the height of the second adhesive portion 320 can be set to 1.1 mm. The above references for the height setting of the second adhesive portion 320 are merely exemplary and not limiting; other heights are also possible.

[0052] In some embodiments, the width of the second adhesive portion 320 is greater than the width of the outer extension portion 220. By setting the width of the second adhesive portion 320 to be greater than the width of the outer extension portion 220, the second adhesive portion 320 can better cover the edge of the outer extension portion 220 of the tab 200, enhance insulation performance, reduce the possibility of short circuits between the tab 200 and nearby metal casing, other electrodes, or circuit components, and ensure normal operation and safe use of the battery.

[0053] In some embodiments, the width of the second adhesive portion 320 extends beyond the width of the outer extension portion 220 on one side by a range of 0.2 mm to 0.6 mm. Specifically, the width of the second adhesive portion 320 extending beyond the outer extension portion 220 on one side can be set within the range of 0.2 mm to 0.6 mm; for example, the width of the second adhesive portion 320 extending beyond the outer extension portion 220 on one side can be set to 0.2 mm, 0.4 mm, or 0.6 mm. Based on the range of 0.2 mm to 0.6 mm for the width of the second adhesive portion 320 extending beyond the outer extension portion 220 on one side, it can be understood that the total width of the second adhesive portion 320 extending beyond the outer extension portion 220 ranges from 0.4 mm to 1.2 mm.

[0054] Reference Figure 2 , Figure 2 This is a schematic diagram of the structure of a soft-pack button battery in one embodiment of the present invention:

[0055] This utility model embodiment also proposes a soft-pack button battery, such as Figure 2 As shown, the soft-pack button cell battery includes:

[0056] 400 for the casing;

[0057] A core is disposed in the housing 400. The core includes an anode electrode, a diaphragm, and a cathode electrode that are stacked and wound together.

[0058] The anode and cathode electrodes include at least one electrode as described in the foregoing embodiments.

[0059] The specific structure of the electrode sheet is as described in the above embodiments. Since this soft-pack button cell adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0060] The casing 400 is mainly composed of aluminum-plastic film, which can be an aluminum-plastic composite film. It generally includes an outer nylon layer, which provides good mechanical strength and wear resistance; an inner aluminum foil layer, which can block moisture and oxygen to prevent the battery from reacting with the external environment; and an inner hot air layer, which is usually PP (polypropylene) and CPP (cast polypropylene), which can encapsulate the battery through a heat sealing process to form a sealed whole.

[0061] Inside the casing 400, the anode and cathode plates of the wound core are separated by a separator, and electrolyte fills the gaps between the anode, separator, and cathode plates. When the battery is connected to a circuit, under the influence of an electric field, lithium ions in the cathode plate move through the electrolyte to the anode plate. Simultaneously, electrons flow from the anode to the cathode from the external circuit, thereby generating current. The tabs of both the anode and cathode plates extend beyond the casing 400 for connection to external circuits.

[0062] Optionally, the anode electrode may include the electrode as described in the foregoing embodiments, the cathode electrode may include the electrode as described in the foregoing embodiments, or both the anode electrode and the cathode electrode may include the electrode as described in the foregoing embodiments.

[0063] When the anode electrode includes the electrode described in the aforementioned embodiments, the tab adhesive 300 applied to the anode tab is a T-shaped adhesive. When the T-shaped adhesive is bent along with the anode tab, its second adhesive portion 320 can bear part of the stress generated by bending, guiding the stress from the critical bending part to other parts, thereby reducing the stress concentration at the bending position and allowing the stress to be more effectively dispersed. The bending operation of the anode tab is relatively easy and labor-saving. When the cathode electrode includes the electrode described in the aforementioned embodiments, the tab adhesive 300 applied to the cathode tab is a T-shaped adhesive. When the T-shaped adhesive is bent along with the cathode tab, its second adhesive portion 320 can bear part of the stress generated by bending, guiding the stress from the critical bending part to other parts, thereby reducing the stress concentration at the bending position and allowing the stress to be more effectively dispersed. The bending operation of the cathode tab is relatively easy and labor-saving.

[0064] In some embodiments, such as Figure 2As shown, the housing 400 has a sealing area where the tab 200 protrudes, and the second adhesive portion 320 is located outside the sealing area. In this embodiment, the sealing area of ​​the housing 400 refers to the part where the edge of the housing 400 is sealed during the battery packaging process. Typically, in the sealing area of ​​the housing 400, the multi-layer structure of the housing 400 is joined together by heat sealing or other sealing methods to form a closed space. The anode tab and cathode tab protrude from the housing 400 and are then sealed accordingly. The fact that the second adhesive portion 320 is located outside the sealing area prevents gaps from forming during packaging due to the corner of the connection between the second adhesive portion 320 and the first adhesive portion 310 being located within the sealing area, thereby reducing the risk of leakage.

[0065] In some embodiments, such as Figure 2 As shown, the first adhesive portion 310 extends beyond the sealing area but does not exceed the thickness space of the housing 400. In this embodiment, by extending the first adhesive portion 310 beyond the sealing area, the corner position at the connection between the second adhesive portion 320 and the first adhesive portion 310 is correspondingly outside the sealing area, thereby avoiding the formation of gaps within the sealing area and further reducing the risk of leakage. Furthermore, the first adhesive portion 310 does not exceed the thickness space of the housing 400, preventing an increase in battery thickness due to the first adhesive portion 310 exceeding the thickness space of the housing 400, which is beneficial for battery miniaturization design.

[0066] In some embodiments, such as Figure 2 As shown, along the thickness direction of the core, the side of the second adhesive portion 320 away from the first adhesive portion 310 extends beyond the top of the housing 400. This structural arrangement effectively isolates the tab 200 from conductive objects that may come into contact with the outside world, preventing the risk of short circuits. It also provides a certain degree of physical protection for the tab 200. When the battery is subjected to external pressure, collision, or friction, it can buffer the tab 200, reducing the possibility of damage to the tab 200, thereby ensuring the normal performance and service life of the battery.

[0067] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A pole piece, characterized in that, The application relates to a tab, a tab jelly and a battery. The tab comprises a tab body, a tab ear and a tab jelly. The tab ear has a welding part and an extension part. The welding part is welded to the tab body.

2. The pole piece of claim 1, wherein The extension part extends from the welding part and protrudes out of the tab body. The tab jelly is attached to the extension part.

3. The pole piece of claim 1, wherein The tab jelly is T-shaped.

4. The pole piece of claim 1, wherein The T-shaped tab jelly has a first jelly part and a second jelly part arranged in sequence along the extension direction of the extension part.

5. The pole piece of claim 1, wherein The width of the second jelly part is smaller than that of the first jelly part.

6. The pole piece of claim 5, wherein The second jelly part covers the bending position of the tab ear.

7. A pouch-type battery, characterized by, The T-shaped tab jelly comprises a first T-shaped jelly layer and a second T-shaped jelly layer. Both the first T-shaped jelly layer and the second T-shaped jelly layer are formed with the first jelly part and the second jelly part. The first T-shaped jelly layer and the second T-shaped jelly layer are located on opposite sides of the extension part. The first jelly part of the first T-shaped jelly layer is attached to the first jelly part of the second T-shaped jelly layer.

8. The pouch battery of claim 7, wherein, The second jelly part of the second T-shaped jelly layer is attached to the second jelly part of the second T-shaped jelly layer.

9. The pouch battery of claim 8, wherein, The T-shaped tab jelly comprises a T-shaped jelly sleeve.

10. The pouch battery of claim 9, wherein, The T-shaped jelly sleeve is sleeved on the extension part. The height of the second jelly part ranges from 0.6mm to 1.1mm. The width of the second jelly part is greater than that of the extension part. The width of the second jelly part exceeds the width of the extension part by 0.2mm to 0.6mm on one side. The application relates to a battery. The battery comprises a shell and a winding core. The winding core is arranged in the shell. The winding core comprises an anode tab, a diaphragm and a cathode tab arranged in a laminated winding mode. At least one of the anode tab and the cathode tab comprises the tab as claimed in any one of claims 1 to 6. The position, through which the tab ear penetrates the shell, has a sealing area. The second jelly part is located outside the sealing area. The first jelly part extends out of the sealing area and does not exceed the thickness space of the shell. In the thickness direction of the winding core, the side of the second jelly part away from the first jelly part exceeds the top of the shell.

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