Battery cell and rubberizing tool

Abstract

The utility model discloses a battery cell and a rubberizing tool, and the battery cell comprises a shell with an opening; the winding body is mounted in the shell, a plurality of tabs are arranged at the first end of the winding body, and the tabs are folded to form a tab bundle; the cover plate is connected with the shell and seals the opening of the shell, and a pole is arranged on the cover plate; the electric connecting piece is located between the first end of the winding body and the cover plate, the tab bundle is welded to the electric connecting piece, the connecting area of the tab bundle and the electric connecting piece is a welding printing area, and the pole penetrates through the cover plate to be connected to the electric connecting piece; the first adhesive tape is arranged along the extension direction of the tab bundle, one end of the first adhesive tape is adhered to the side surface of the winding body, the other end of the first adhesive tape is adhered to the welding printing area, and the part, between the winding body and the welding printing area, of the first adhesive tape is not adhered to the tab. And the part, between the winding body and the welding printing area, of the first adhesive tape is not adhered to the tab, so that the damage and pressing damage to the tab in the adhesive pasting process are reduced, the constraint of the adhesive tape to the tab is also reduced, and the bundling state of the tab is improved.

Description

Technical Field

[0001] The utility model relates to an electric core and a glue sticking tool. Background Art

[0002] During battery assembly, after the tabs and electrical connectors are ultrasonically welded, adhesive tape is applied to protect the weld marks. The existing adhesive tape application method involves applying tape from the lower end of the winding body along the tab to the upper end of the electrical connector, with the tape covering the weld mark area. Because the tape is applied directly to the tabs, it can easily cause the tabs to bend and damage the base of the tabs in subsequent processes. Furthermore, when the tabs are bent, the tape exerts a certain amount of pull on the tabs, which can easily cause the adhesive tape to fail. Furthermore, the tape significantly constrains the bent arc area of ​​the tabs, causing the outer tab base to stretch the diaphragm or bifurcate. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defect in the prior art that the adhesive tape easily causes damage to the tab, and to provide a battery cell and adhesive application tooling.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A battery cell, comprising:

[0006] a housing having an opening;

[0007] A winding body is installed inside the shell, wherein a first end of the winding body has a plurality of tabs, and the plurality of tabs are gathered to form a tab bundle;

[0008] a cover plate connected to the shell and closing the opening of the shell, wherein the cover plate is provided with a pole;

[0009] an electrical connection piece, located between the first end of the wound body and the cover plate, the tab bundle being welded to the electrical connection piece, the connection area between the tab bundle and the electrical connection piece being a weld mark area, and the pole passing through the cover plate being connected to the electrical connection piece;

[0010] A first tape is arranged along the extension direction of the tab bundle, one end of the first tape is adhered to the side of the winding body, the other end of the first tape is adhered to the weld print area, and the portion of the first tape between the winding body and the weld print area is not adhered to the tab.

[0011] In this solution, the battery cell uses the two ends of the first tape to stick the weld area and the side of the winding body respectively, so that the relative position of the winding body and the electrical connecting piece is fixed, thereby protecting the connection point between the tab bundle and the electrical connecting piece and the root of the tab. The part of the first tape between the winding body and the weld area is not stuck to the tab, which can reduce damage and pressure to the tab during the gluing process, and reduce the restraint of the tape on the tab, which is beneficial to the release of stress during the bending process of the tab and improves the tab clustering state. At the same time, after the tab is bent, the tape can protect the outer tab to avoid the situation where the root of the outer tab stretches the diaphragm or the tab is forked, thereby improving the qualified rate of battery cell production.

[0012] Preferably, the first adhesive tape includes a first section, a second section and a third section sequentially arranged along the length direction, the first section is bonded to the weld print area, the second section has no adhesive, and the third section is bonded to the side of the winding body.

[0013] In this solution, by not providing adhesive on the second section, the second section of the first tape is prevented from adhering to the tab, and the first tape is prevented from pulling on the tab, thereby damaging the tab.

[0014] Preferably, the first adhesive tape includes a base and an adhesive layer, the base extends from the first section to the third section, the bases of the first section and the third section are coated with the adhesive layer, and the second section is not provided with the adhesive layer.

[0015] In this solution, the base is used to support the adhesive layer, the base also provides the connecting tension, and the adhesive layer provides the bonding force. No adhesive layer is provided on the second section, which prevents the second section of the first tape from adhering to the tab after the tab is bent, thereby damaging the tab.

[0016] Preferably, the tab close to the first tape maintains a preset distance from the first tape both before and after being bundled.

[0017] In this solution, the tabs are kept at a preset distance from the first tape before and after being bundled, thereby preventing the first tape from adhering to the tabs and causing damage to the tabs.

[0018] Preferably, the wound body includes a plurality of pole piece layers, and a portion of the plurality of pole piece layers is led out to form the pole lug.

[0019] In this solution, the above-mentioned structural arrangement is adopted so that the tabs led out of the winding body are all on the side away from the first tape, so that a preset distance is maintained between the tabs and the first tape, avoiding the first tape affecting and adhering to the tabs.

[0020] Preferably, the number of the winding bodies is two, the two winding bodies are arranged side by side, and the tabs of each winding body are arranged on a side away from the first tape.

[0021] In this solution, the two windings can increase the power of the battery cell. The tabs of each winding are arranged on a side away from the first tape, so that the tabs are arranged away from the first tape to prevent the first tape from adhering to the tabs.

[0022] Preferably, the number of the winding bodies is four, and the four winding bodies are arranged side by side. Every two adjacent winding bodies form a group of winding body assemblies, and the tabs of each group of the winding body assemblies are located in the middle of the end surface of the winding body assembly.

[0023] In this solution, the four winding bodies can increase the power of the battery core. The tabs of each set of winding body assembly are located in the middle of the end surface of the winding body assembly to keep the tabs away from the first tape to prevent the tabs from adhering to the first tape.

[0024] Preferably, the battery cell also includes a second tape, which is arranged on the side of the tab bundle away from the first tape, one end of the second tape is adhered to the side of the winding body, and the other end of the second tape is adhered to the electrical connecting piece, and the middle part of the second tape does not contact the tab.

[0025] In this solution, a second tape is placed on the outside of the tab to protect the tab while also securing the electrical connection tab and the wound body. This protects the connection between the tab and the tab bundle and prevents the tab from being pulled. The middle of the second tape does not contact the tab, preventing the middle of the second tape from adhering to the tab and damaging it.

[0026] Preferably, the second adhesive tape comprises a base and an adhesive layer, both ends of the base along the length direction are coated with the adhesive layer, and the middle portion of the base along the length direction is not provided with the adhesive layer.

[0027] In this solution, no adhesive layer is provided in the middle portion of the substrate along the length direction, so as to prevent the tab from being adhered to the tape during the process of contraction and bending, thereby protecting the tab.

[0028] A gluing tool, which is used for gluing the battery cell as described above, and comprises:

[0029] A first cylinder has a first telescopic rod, an end of the first telescopic rod is connected to a first rubber plate, and the first rubber plate is arranged corresponding to the welding area;

[0030] The second cylinder is arranged side by side with the first cylinder. The second cylinder has a second telescopic rod. The end of the second telescopic rod is connected to a second rubber plate. The second rubber plate is arranged corresponding to the side rubber position of the winding body.

[0031] In this embodiment, when applying adhesive, the first or second tape is applied to one side of the wound body first, followed by the second or first tape on the other side. When applying the first tape, the first cylinder extends and retracts the first telescopic rod, causing the first adhesive plate to attach one end of the first tape to the weld area; the second cylinder extends and retracts the second telescopic rod, causing the second adhesive plate to attach the other end of the first tape to the side of the wound body. When applying the second tape, the first cylinder extends and retracts the first telescopic rod, causing the first adhesive plate to attach one end of the second tape to the electrical connector; the second cylinder extends and retracts the second telescopic rod, causing the second adhesive plate to attach the other end of the second tape to the side of the wound body. Preferably, the first and second cylinders can be set synchronously or asynchronously. After gluing, the first tape and the second tape do not contact the tabs, forming an air-avoidance space. After gluing, the tabs are bent in pairs. During the bending process, the binding force of the outermost tabs is small due to the air-avoidance of the tape, and a bending arc surface is easily formed. After bending, the tape forms an air-avoidance protection for the tabs, thereby improving the situation of tab damage and inward insertion of the arc surface after the tabs are bent.

[0032] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0033] The positive progressive effect of the present invention is that the battery cell sticks the weld print area and the side of the winding body through the two ends of the first tape, so that the relative position of the winding body and the electrical connection piece is fixed, which protects the connection point between the tab bundle and the electrical connection piece and the root of the tab, and the part of the first tape between the winding body and the weld print area is not stuck to the tab, which can reduce damage and pressure to the tab during the gluing process, and also reduce the restraint of the tape on the tab, which is beneficial to the release of stress during the bending process of the tab and improves the tab clustering state. At the same time, after the tab is bent, the tape can protect the outer tab to avoid the situation where the root of the outer tab stretches the diaphragm or the tab is forked, thereby improving the qualified rate of battery cell production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural schematic diagram of a battery cell according to a preferred embodiment of the present invention, which includes two winding bodies.

[0035] Figure 2 This is a structural schematic diagram of a preferred embodiment of the present invention, in which a battery cell includes four winding bodies.

[0036] Figure 3 This is a structural schematic diagram of a glue-applying tooling according to a preferred embodiment of the present invention.

[0037] Figure 4 This is a schematic structural diagram of a battery cell according to a preferred embodiment of the present invention, including two winding bodies unfolded.

[0038] Figure 5This is a schematic diagram of a preferred embodiment of the present invention using a glue sticking tool to glue the battery core. Figure 1 .

[0039] Figure 6 This is a schematic diagram of a preferred embodiment of the present invention using a glue sticking tool to glue the battery core. Figure 2 .

[0040] Description of reference numerals:

[0041] Shell 1

[0042] Winding 2

[0043] Tab 21

[0044] Tab bundle 22

[0045] Winding body assembly 23

[0046] Electrical connection piece 3

[0047] First tape 4

[0048] Pole 5

[0049] Welding area 6

[0050] Second tape 7

[0051] First cylinder 8

[0052] First telescopic rod 81

[0053] First adhesive sheet 82

[0054] Second cylinder 9

[0055] Second telescopic rod 91

[0056] Second adhesive sheet 92 DETAILED DESCRIPTION

[0057] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0058] like Figure 1 and Figure 2As shown, this embodiment discloses a battery cell, which includes a shell 1, a winding body 2, a cover plate, an electrical connecting piece 3 and a first tape 4. The shell 1 has an opening, the winding body 2 is installed inside the shell 1, the first end of the winding body 2 has a plurality of pole ears 21, and the plurality of pole ears 21 are gathered to form a pole ear bundle 22. The cover plate is connected to the shell 1 and closes the opening of the shell 1. A pole 5 is provided on the cover plate. The electrical connecting piece 3 is located between the first end of the winding body 2 and the cover plate. The pole ear bundle 22 is welded to the electrical connecting piece 3. The connection area between the pole ear bundle 22 and the electrical connecting piece 3 is a weld print area 6. The pole 5 is connected to the electrical connecting piece 3 through the cover plate. The first tape 4 is arranged along the extension direction of the pole ear bundle 22. One end of the first tape 4 is adhered to the side of the winding body 2, and the other end of the first tape 4 is adhered to the weld print area 6. The portion of the first tape 4 between the winding body 2 and the weld print area 6 is not adhered to the pole ear 21.

[0059] like Figure 1 and Figure 2 As shown, in this embodiment, the battery cell is pasted with the weld print area 6 and the side of the winding body 2 by the two ends of the first tape 4, so that the relative position of the winding body 2 and the electrical connecting piece 3 is fixed, thereby protecting the connection point between the tab bundle 22 and the electrical connecting piece 3 and the root of the tab 21, and the part of the first tape 4 between the winding body 2 and the weld print area 6 is not pasted to the tab 21, which can reduce damage and pressure to the tab 21 during the gluing process, and also reduce the restraint of the tape on the tab 21, which is beneficial to the release of stress during the bending process of the tab 21 and improves the contraction state of the tab 21. At the same time, after the tab 21 is bent, the tape can protect the outer tab 21 to avoid the situation where the root of the outer tab 21 stretches the diaphragm or the tab is forked, thereby improving the qualified rate of battery cell production.

[0060] The first adhesive tape 4 includes a first section, a second section, and a third section arranged in sequence along the length direction. The first section is bonded to the weld mark area 6, the second section has no adhesive, and the third section is bonded to the side of the wound body 2. By not having adhesive on the second section, the second section of the first adhesive tape 4 is prevented from bonding to the tab 21, preventing the first adhesive tape 4 from pulling on the tab 21 and damaging the tab 21.

[0061] Specifically, in this embodiment, the first adhesive tape 4 comprises a base and an adhesive layer. The base extends from the first to the third section, and the bases of the first and third sections are coated with an adhesive layer. The second section is not provided with an adhesive layer. The base supports the adhesive layer and provides tensile strength for connection, while the adhesive layer provides adhesion. The absence of an adhesive layer on the second section prevents the second section of the first adhesive tape 4 from adhering to the tab 21 after it is bent, thereby preventing damage to the tab.

[0062] like Figure 1 and Figure 2As shown, the tab 21 close to the first tape 4 maintains a preset distance from the first tape 4 before and after being bundled, so as to prevent the first tape 4 from adhering to the tab 21 and thereby causing damage to the tab 21 .

[0063] The wound body 2 includes several electrode layers, and a part of the electrode layers is led out to form the electrode ears 21, so that the electrode ears 21 led out of the wound body 2 are all on the side away from the first tape 4, so that a preset distance is maintained between the electrode ears 21 and the first tape 4 to avoid the first tape 4 affecting and bonding the electrode ears 21.

[0064] like Figure 1 、 Figure 4-Figure 6 As shown, in one embodiment, there are two jellyrolls 2, which are arranged side by side to increase the battery cell's capacity. The tabs 21 of each jellyroll 2 are positioned on a side away from the first tape 4, preventing the first tape 4 from adhering to the tabs 21.

[0065] like Figure 2 As shown, in another embodiment, the number of wound bodies 2 is four, and the four wound bodies 2 are arranged side by side to increase the power capacity of the battery cell. Every two adjacent wound bodies 2 form a wound body assembly 23. The tabs 21 of each wound body assembly 23 are located in the middle of the end surface of the wound body assembly 23, so that the tabs 21 are away from the first tape 4 to prevent the tabs 21 from adhering to the first tape 4.

[0066] like Figure 1 and Figure 2 As shown, in this embodiment, the battery cell further includes a second tape 7, which is arranged on the side of the tab bundle 22 away from the first tape 4. One end of the second tape 7 is adhered to the side of the winding body 2, and the other end of the second tape 7 is adhered to the electrical connection sheet 3. The middle part of the second tape 7 does not contact the tab 21, thereby protecting the tab 21. By arranging the second tape 7 on the outside of the tab 21, on the one hand, the tab 21 is protected, and on the other hand, the position of the electrical connection sheet 3 and the winding body 2 is fixed, thereby protecting the connection position between the electrical connection sheet 3 and the tab bundle 22 and avoiding pulling on the tab 21.

[0067] The second tape 7 includes a base and an adhesive layer. Both ends of the base along the length direction are coated with an adhesive layer, and the middle part of the base along the length direction is not provided with an adhesive layer to prevent the tab 21 from adhering to the tape during the process of contraction and bending.

[0068] like Figure 4 As shown, the battery cell includes two winding bodies 2 arranged in parallel, and the structural diagram of the two winding bodies after being unfolded and laid flat is shown. Figure 4 Only the lower half of the electrical connection sheet 3 , the first adhesive tape 4 , the tab 21 and the weld print area 6 are shown.

[0069] In one embodiment, the electrical connection piece is provided at the bottom of the cover plate, and the electrical connection piece and the cover plate are provided integrally.

[0070] like Figure 3 、 Figure 5 and Figure 6 As shown, this embodiment also discloses a glue sticking tool, which is used for glue sticking of the battery cell as described above. The glue sticking tool includes a first cylinder 8 and a second cylinder 9. The first cylinder 8 has a first telescopic rod 81. The end of the first telescopic rod 81 is connected to a first glue sticking plate 82. The first glue sticking plate 82 is arranged corresponding to the welding area 6. The second cylinder 9 is arranged side by side with the first cylinder 8. The second cylinder 9 has a second telescopic rod 91. The end of the second telescopic rod 91 is connected to a second glue sticking plate 92. The second glue sticking plate 92 is arranged corresponding to the side glue sticking position of the winding body 2.

[0071] like Figure 5 and Figure 6 As shown, when applying adhesive, the first adhesive tape 4 or the second adhesive tape 7 is applied to one side of the wound body 2 first, followed by the second adhesive tape 7 or the first adhesive tape 4 on the other side of the wound body 2. When applying the first adhesive tape 4, the first cylinder 8 extends and retracts the first telescopic rod 81, causing the first adhesive plate 82 to attach one end of the first adhesive tape 4 to the weld stamp area 6; the second cylinder 9 extends and retracts the second telescopic rod 91, causing the second adhesive plate 92 to attach the other end of the first adhesive tape 4 to the side of the wound body 2. When applying the second adhesive tape 7, the first cylinder 8 extends and retracts the first telescopic rod 81, causing the first adhesive plate 82 to attach one end of the second adhesive tape 7 to the electrical connection piece 3; the second cylinder 9 extends and retracts the second telescopic rod 91, causing the second adhesive plate 92 to attach the other end of the second adhesive tape 7 to the side of the wound body 2. Preferably, the first cylinder 8 and the second cylinder 9 can be provided synchronously. After gluing, the first tape 4 and the second tape 7 do not contact the tab 21, forming an air-avoidance space. After gluing, the tab 21 is bent in pairs. During the bending process, the binding force of the outermost tab bundle 22 is small due to the air-avoidance of the tape, and a bending arc surface is easily formed. After bending, the tape forms an air-avoidance protection for the tab 21, thereby improving the situation of damage to the tab 21 and inward insertion of the arc surface after the tab 21 is bent.

[0072] exist Figure 5 Schematic diagram of the glue application in which the glue application tools are installed on one side of the battery cell one by one is shown in FIG.

[0073] exist Figure 6 Figure 3 shows the electrical connector 3 in a horizontal position for adhesive application. To facilitate adhesive application, the second adhesive tape 7 is applied first, followed by the first adhesive tape 4. After adhesive application, the electrical connector 3 is flipped 90° clockwise before proceeding to the next step in the battery cell production process.

[0074] In the description of this article, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0075] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A battery cell, characterized in that: It includes: a housing having an opening; A winding body is installed inside the shell, wherein a first end of the winding body has a plurality of tabs, and the plurality of tabs are gathered to form a tab bundle; a cover plate connected to the shell and closing the opening of the shell, wherein the cover plate is provided with a pole; an electrical connection piece, located between the first end of the wound body and the cover plate, the tab bundle being welded to the electrical connection piece, the connection area between the tab bundle and the electrical connection piece being a weld mark area, and the pole passing through the cover plate being connected to the electrical connection piece; A first tape is arranged along the extension direction of the tab bundle, one end of the first tape is adhered to the side of the winding body, the other end of the first tape is adhered to the weld print area, and the portion of the first tape between the winding body and the weld print area is not adhered to the tab.

2. The battery cell according to claim 1, wherein: The first adhesive tape includes a first section, a second section and a third section arranged in sequence along the length direction, the first section is bonded to the weld print area, the second section has no adhesive, and the third section is bonded to the side of the winding body.

3. The battery cell according to claim 2, wherein: The first adhesive tape includes a base and an adhesive layer. The base extends from the first section to the third section. The bases of the first section and the third section are both coated with the adhesive layer. The second section is not provided with the adhesive layer.

4. The battery cell according to claim 1, wherein: The tab close to the first tape maintains a preset distance from the first tape both before and after being bundled.

5. The battery cell according to claim 1, wherein: The wound body includes a plurality of pole piece layers, and a portion of the plurality of pole piece layers is led out to form the pole lug.

6. The battery cell according to claim 5, characterized in that There are two winding bodies, which are arranged side by side, and the tab of each winding body is arranged on a side away from the first tape.

7. The battery cell according to claim 5, characterized in that The number of the winding bodies is four, and the four winding bodies are arranged side by side. Every two adjacent winding bodies form a group of winding body components, and the tabs of each group of the winding body components are located in the middle of the end surface of the winding body component.

8. The battery cell according to claim 1, wherein: The battery cell also includes a second tape, which is arranged on the side of the tab bundle away from the first tape, one end of the second tape is adhered to the side of the winding body, and the other end of the second tape is adhered to the electrical connecting piece, and the middle part of the second tape does not contact the tab.

9. The battery cell according to claim 8, characterized in that The second adhesive tape includes a base and an adhesive layer. Both ends of the base along the length direction are coated with the adhesive layer, and the middle portion of the base along the length direction is not provided with the adhesive layer.

10. A glue sticking tool, characterized in that: The gluing tool is used for gluing the battery cell according to any one of claims 1 to 8, and the gluing tool comprises: A first cylinder has a first telescopic rod, an end of the first telescopic rod is connected to a first rubber plate, and the first rubber plate is arranged corresponding to the welding area; The second cylinder is arranged side by side with the first cylinder. The second cylinder has a second telescopic rod. The end of the second telescopic rod is connected to a second rubber plate. The second rubber plate is arranged corresponding to the side rubber position of the winding body.

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