Battery cell tab welding structure, battery, electronic equipment and welding equipment

Abstract

The utility model discloses a battery cell tab welding structure, battery, electronic equipment and welding equipment, the battery cell tab welding structure comprises a tin-copper alloy layer and a plurality of tab bodies, the plurality of tab bodies are arranged along a first direction, the tin-copper alloy layer is arranged between every two adjacent tab bodies along the first direction, and the tin-copper alloy layer is arranged between every two adjacent tab bodies along the first direction. And the tab body and the tin-copper alloy layer are connected through ultrasonic welding. The utility model aims to solve the problems in the prior art that the welding yield of a battery cell tab is low during ultrasonic welding, and the defects of tab breakage, false welding, welding failure, infirmness after welding, incomplete welding, poor welding tension, low welding success rate and the like are easily caused when a sound head vibrates.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology, and in particular to a battery core tab welding structure, a battery, an electronic device, and a welding device. Background Art

[0002] Due to the rapid development of new energy electric vehicles, the demand for batteries is also increasing, and the application of ultrasonic welding of copper foil and aluminum foil has increased significantly. Ultrasonic welding uses ultrasonic vibration to make the metal surface particles rub against each other, thereby generating friction heat to increase the metal surface temperature and achieve the purpose of melting. When the metal surface temperature reaches the melting temperature, the copper foil surface begins to melt, and the molten tinned copper wire and the welding substrate diffuse with each other to form a welding joint.

[0003] However, at present, the welding yield of battery cell tabs (taking copper tabs as an example) is not high during ultrasonic welding, and the first-time good rate is less than 93%. When the ultrasonic head vibrates, defects such as tab breakage, false welding, inadequate welding, loose welding, incomplete penetration, poor welding tension, and low welding success rate are prone to occur.

[0004] The above contents are only used to assist in understanding the technical solution of the present utility model and do not constitute an admission that the above contents are prior art. Utility Model Content

[0005] The main purpose of the utility model is to provide a battery cell tab welding structure, a battery, an electronic device, and a welding device, aiming to solve the problems in the prior art of low battery cell tab welding yield, and easy tab breakage, false welding, poor welding, weak welding, incomplete welding, poor welding tension, and low welding success rate when the acoustic head vibrates.

[0006] In order to achieve the above object, the utility model provides a battery cell tab welding structure, the battery cell tab welding structure comprising:

[0007] a tin-copper alloy layer; and,

[0008] A plurality of tab bodies are arranged along a first direction, the tin-copper alloy layer is arranged between every two adjacent tab bodies along the first direction, and the tab bodies and the tin-copper alloy layer are connected by ultrasonic welding.

[0009] Preferably, in the battery cell tab welding structure, the thickness of the tin-copper alloy layer disposed between every two adjacent tab bodies along the first direction is H, and 5 μm≤H≤10 μm.

[0010] Preferably, in the battery cell tab welding structure, the tab body has a welding area, and the tin-copper alloy layer is arranged between the welding areas of two adjacent tab bodies.

[0011] Preferably, in the battery cell tab welding structure, the tin-copper alloy layer extends along a second direction, and the second direction is perpendicular to the first direction;

[0012] The tin-copper alloy layer has a first end away from the center of the tab body and a second end close to the center of the tab body and opposite to the first end. The tin-copper alloy layer extends from the first end toward the second end, and the second end is inclined.

[0013] Preferably, in the battery cell tab welding structure, the width of the welding area along the first direction is W, wherein 6mm≤W≤8mm.

[0014] In order to achieve the above-mentioned purpose, the utility model provides a battery, comprising a battery cell and a pole lug arranged on the battery cell, wherein the pole lug comprises the above-mentioned battery cell pole lug welding structure.

[0015] In order to achieve the above object, the utility model provides an electronic device, wherein the electronic device comprises the above battery.

[0016] In order to achieve the above object, the utility model provides a welding device for the above-mentioned battery cell tab welding structure, characterized in that it includes:

[0017] An ultrasonic welding machine, comprising a welding head, wherein the welding head is used to weld the battery cell tab welding structure; and

[0018] The fixture is used to clamp the welding structure of the battery cell tab.

[0019] Preferably, in the welding device, the welding head comprises:

[0020] Mounting plate;

[0021] A buckle cover, which is disposed on the mounting plate and is surrounded together with the mounting plate to form a cavity;

[0022] A first gear, mounted in the cavity;

[0023] A second gear, installed in the cavity and meshing with the first gear;

[0024] A welding head body, fixedly connected to the first gear;

[0025] A driving motor is mounted on the mounting plate or the buckle cover and is drivingly connected to the second gear.

[0026] Preferably, in the welding device, the first gear comprises:

[0027] a gear body, installed in the cavity and meshing with the second gear;

[0028] An intermediate piece is formed by radially extending from the tooth body;

[0029] a hub body, on which the welding head body is mounted; and

[0030] Connecting pieces are used to connect the intermediate piece and the hub body respectively.

[0031] The utility model has at least the following beneficial effects:

[0032] The utility model arranges the multiple tab bodies along the first direction, the tin-copper alloy layer is provided between every two adjacent tab bodies along the first direction, and the tab bodies and the tin-copper alloy layer are connected by ultrasonic welding, thereby solving the problems in the prior art of low welding yield of the battery tabs during ultrasonic welding, and easy occurrence of tab breakage, false welding, poor welding, loose welding, incomplete welding, poor welding tension, and low welding success rate when the acoustic head vibrates.

[0033] Furthermore, by arranging a tin-copper alloy layer between the tab bodies and utilizing the advantages of the tin-copper alloy having a low melting point and good welding performance, the purpose of improving production efficiency and improving welding yield is achieved; during the ultrasonic welding process, welding between the cell tabs (for the sake of convenience, the copper tabs are taken as an example below) requires that the contacting copper materials melt each other, and since the melting point of the tin-copper alloy powder is 232°C and the melting point of copper is 1086°C, the energy required to weld the copper tabs after the tin-copper alloy is melted is less than half of the direct welding between copper materials. Through this process improvement, the energy of the acoustic head acting on the tabs can be reduced, the stress during the welding of the tabs can be reduced, and the tab breakage can be reduced. The energy and technical requirements for tin-copper medium welding are less than those for copper-copper welding, thereby improving the welding success rate and reducing the defective rate by 70%-90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of an embodiment of a battery cell tab welding structure provided by the utility model;

[0035] Figure 2 A schematic diagram of a welding head provided by the utility model;

[0036] Figure 3 for Figure 2 Schematic diagram of the decomposition of the middle part structure;

[0037] Figure 4 for Figure 2 A cross-sectional view of

[0038] Figure 5 for Figure 4 A magnified schematic diagram of center A.

[0039]

[0040]

[0041] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] In the embodiments of the present invention, the term "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0044] The term "plurality" in the embodiments of the present invention refers to two or more than two, and other quantifiers are similar thereto.

[0045] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings. However, it can be understood by those skilled in the art that in the embodiments of the utility model, many technical details are proposed in order to enable readers to better understand the utility model. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed for protection of the utility model can also be implemented. The division of the following embodiments is for the convenience of description and should not constitute any limitation on the specific implementation of the utility model. The various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0047] The utility model provides a battery core tab welding structure, please refer to Figure 1 The battery cell tab welding structure 100 includes a tin-copper alloy layer 1 and a plurality of tab bodies 2, wherein the plurality of tab bodies 2 are arranged along a first direction, the tin-copper alloy layer 1 is provided between every two adjacent tab bodies 2 along the first direction, and the tab bodies 2 and the tin-copper alloy layer 1 are connected by ultrasonic welding.

[0048] It should be noted that the battery cell tabs can be but are not limited to copper tabs. For the sake of convenience in the following description, the battery cell tabs are copper tabs as an example, but it does not mean that the battery cell tabs are limited to copper tabs.

[0049] At present, during ultrasonic welding, the welding yield of battery cell tabs (taking copper tabs as an example) is not high, and the first-time good rate is less than 93%. When the acoustic head vibrates, defects such as tab breakage, false welding, inadequate welding, loose welding, incomplete penetration, poor welding tension, and low welding success rate are prone to occur.

[0050] The utility model arranges a tin-copper alloy layer 1 between two tab bodies, and utilizes the advantages of the tin-copper alloy with a low melting point and good welding performance to achieve the purpose of improving production efficiency and improving welding yield rate; in the ultrasonic welding process, welding between the tabs of the battery cell (for the sake of convenience, the copper tab is taken as an example below) requires that the contacting copper materials are mutually melted, and since the melting point of the tin-copper alloy powder is 232°C and the melting point of copper is 1086°C, the energy required for welding the copper tab after the tin-copper alloy is melted is less than half of the direct welding between the copper materials, and through this process improvement, the energy of the acoustic head acting on the tab can be reduced, the stress during the welding of the tab can be reduced, and the tab breakage can be reduced, the energy and technical requirements of the tin-copper medium welding are less than those of the copper-copper welding, the welding success rate is improved, and the defective rate is reduced by 70%-90%.

[0051] The formula of the tin-copper alloy layer 1 may adopt a conventional formula, or may adopt, for example, the tin-copper alloy layer 1 includes tin: 90%-97.5%, copper: 0.5%, and flux: 2%-9.5%.

[0052] In specific operations, you can first use organic solvents to clean the dust and extract the flux after welding.

[0053] In this embodiment, the thickness of the tin-copper alloy layer 1 disposed between every two adjacent tab bodies 2 along the first direction is H, 5 μm≤H≤10 μm. If H is too thick, the welding performance will be significantly reduced, and if it is too thin, it will not work.

[0054] More specifically, the tab body 2 has a welding area 21, and the tin-copper alloy layer 1 is disposed between the welding areas 21 of two adjacent tab bodies 2. For example, two adjacent tab bodies 2 are respectively a first tab body 2 and a second tab body 2, and the tin-copper alloy layer 1 is disposed between the welding area 21 of the first tab body 2 and the welding area 21 of the second tab body 2.

[0055] The tin-copper alloy layer 1 extends along a second direction, and the second direction is perpendicular to the first direction; the tin-copper alloy layer 1 has a first end away from the center of the tab body 2 and a second end close to the center of the tab body 2 and opposite to the first end, and the tin-copper alloy layer 1 extends from the first end toward the second end, and the second end is inclined, so that burr particles are not easily generated. Assuming that the tin-copper alloy layer 1 is arranged in a square shape, there will be material gaps, which makes it easy for layers to peel off and burr particles to be generated. In this embodiment, the first direction can be the up and down direction, and the second direction is the left and right direction.

[0056] The width of the welding area 21 along the first direction is W, and W can be set according to the size of different battery cells. In the present embodiment, the width of the welding area 21 along the first direction is W, wherein 6 mm≤W≤8 mm.

[0057] In order to achieve the above object, the utility model provides a battery, which includes a battery cell and a tab arranged on the battery cell, wherein the tab includes the above-mentioned battery cell tab welding structure 100. An embodiment of the battery includes an embodiment of the above-mentioned battery cell tab welding structure 100, and the beneficial effects of the above-mentioned battery cell tab welding structure 100 can be applied to the battery.

[0058] In order to achieve the above object, the utility model provides an electronic device, which includes the above battery. The embodiment of the electronic device includes the embodiment of the above battery, and the beneficial effects of the above battery can be applied to the electronic device.

[0059] In order to achieve the above-mentioned purpose, the utility model provides a welding device 200 for the above-mentioned battery cell pole ear welding structure, and the welding device 200 includes an ultrasonic welding machine 210, a clamp, and a temperature control system. The ultrasonic welding machine 210 includes a welding head 211, and the welding head 211 welds the battery cell pole ear welding structure; the clamp is used to clamp the battery cell pole ear welding structure 100.

[0060] Furthermore, the welding equipment 200 of the battery cell tab welding structure also includes a temperature control system, which is electrically connected to the ultrasonic welding machine 210 and is used to control the temperature during the welding process to ensure that the welding material reaches the melting temperature.

[0061] For ease of soldering, see Figures 2 to 5The welding head 211 includes a mounting plate 1a, a snap-on cover 2a, a first gear 3a, a second gear 5a and a welding head body 7a. The snap-on cover 2a is disposed on the mounting plate 1a and together with the mounting plate 1a, a cavity 21a is formed; the first gear 3a is mounted in the cavity 21a; the second gear 5a is mounted in the cavity 21a and meshes with the first gear 3a; the welding head body 7a is fixedly connected to the first gear 3a; the driving motor 6a is mounted on the mounting plate 1a or the snap-on cover 2a and is drivingly connected to the second gear 5a.

[0062] During operation, the welding head body 7a is installed on the first gear 3a, and the first gear 3a and the second gear 5a are meshed and matched. During welding operation, the second gear 5a is driven to rotate by the driving motor 6a, so that the second gear 5a drives the first gear 3a to rotate, and then drives the welding head body 7a to rotate to accurately adjust the relative angle to avoid affecting the welding effect. By setting the welding head body 7a to be rotatable, the welding operation efficiency can be improved. In this way, multiple products to be welded on the workbench can be welded. For example, after one product to be welded is welded, the welding head body 7a is rotated to weld the next product to be welded, thereby improving work efficiency.

[0063] The welding head 211 further includes a lifting structure, and the first gear 3a is mounted on the lifting structure, so that the lifting structure drives the first gear 3a to move in the up and down direction. The lifting structure can be, but is not limited to, a linear drive structure, such as a drive cylinder.

[0064] The first gear 3a includes a tooth body 31a, an intermediate piece 32a, a hub body 33a, and a connecting piece 34a. The tooth body 31a is installed in the cavity 21a and meshes with the second gear 5a. The intermediate piece 32a is formed by radially extending from the tooth body 31a. The hub body 33a is installed with the welding head body 7a. The connecting piece 34a respectively connects the intermediate piece 32a and the hub body 33a.

[0065] There are many ways to install the first gear 3a in the cavity 21a, usually through a bearing. More specifically, the bearing is connected to the center hole of the hub body 33a, and the inner ring of the bearing is fixed by a shaft fixed on the mounting plate 1a. However, this method requires multiple bearings and shafts connected to the multiple bearings to cooperate, which increases the overall volume and weight.

[0066] The two outer surfaces of the middle piece 32a along the axial direction are respectively provided with a first groove 321a and a second groove 322a which are arranged in an annular shape and take the center of the tooth body 31a as the center of the circle; the mounting plate 1a and the buckle cover 2a are respectively provided with a third groove 11a and a fourth groove 22a which are arranged opposite to the notches of the first groove 321a and the second groove 322a; wherein, a first sphere 41a and a second sphere 42a are correspondingly provided between the first groove 321a and the third groove 11a, and between the second groove 322a and the fourth groove 22a, the first sphere 41a respectively abuts against the bottom wall of the first groove 321a and the bottom wall of the third groove 11a, and the second sphere 42a respectively abuts against the bottom wall of the second groove 322a and the bottom wall of the fourth groove 22a, so that the middle piece 32a is supported between the mounting plate 1a and the buckle cover 2a and can rotate relative to the mounting plate 1a and the buckle cover 2a. Since the first sphere 41a is respectively abutted against the bottom wall of the first groove 321a and the bottom wall of the third groove 11a, and the second sphere 42a is respectively abutted against the bottom wall of the second groove 322a and the bottom wall of the fourth groove 22a, the first gear 3a is supported and fixed, and can rotate around the center of the tooth body 31a, while the structure is simple and the overall weight is reduced.

[0067] In addition, the welding head body 7a is fixed to the first gear 3a and can move in the first movable stroke in the up-down direction relative to the first gear 3a. Since the welding head body 7a will vibrate during welding, the welding head body 7a can be moved in the up-down direction relative to the first gear 3a to avoid limiting the movement of the welding head body 7a during welding. Specifically, a slide groove 35a can be provided on one of the welding head body 7a and the first gear 3a, and a sliding portion 71a can be provided on the other, and the slide groove extends in the up-down direction. In this embodiment, a sliding portion 71a is provided on the welding head body 7a, and a slide groove 35a is provided on the first gear 3a. The welding head body 7a and the first gear 3a can slide up and down through the sliding portion 71a slidingly cooperating with the slide groove 35a.

[0068] Obviously, the above described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the utility model.

Claims

1. A battery cell tab welding structure, characterized in that: include: Tin-copper alloy layer; as well as, A plurality of tab bodies are arranged along a first direction, the tin-copper alloy layer is arranged between every two adjacent tab bodies along the first direction, and the tab bodies and the tin-copper alloy layer are connected by ultrasonic welding.

2. The battery cell tab welding structure according to claim 1, characterized in that: The thickness of the tin-copper alloy layer disposed between every two adjacent tab bodies along the first direction is H, 5 μm≤H≤10 μm.

3. The battery cell tab welding structure according to claim 1, characterized in that: The tab body has a welding area, and the tin-copper alloy layer is arranged between the welding areas of two adjacent tab bodies.

4. The battery cell tab welding structure according to claim 3, characterized in that: The tin-copper alloy layer extends along a second direction, and the second direction is perpendicular to the first direction; The tin-copper alloy layer has a first end away from the center of the tab body and a second end close to the center of the tab body and opposite to the first end. The tin-copper alloy layer extends from the first end toward the second end, and the second end is inclined.

5. The battery cell tab welding structure according to claim 3, characterized in that: The width of the welding area along the first direction is W, wherein 6mm≤W≤8mm.

6. A battery, characterized in that: It comprises a battery cell and a tab arranged on the battery cell, wherein the tab comprises the battery cell tab welding structure as claimed in any one of claims 1 to 5.

7. An electronic device, characterized in that: Comprising the battery as claimed in claim 6.

8. A welding device for a battery cell tab welding structure as claimed in any one of claims 1 to 5, characterized in that: include: An ultrasonic welding machine, comprising a welding head, wherein the welding head is used to weld the battery cell tab welding structure; as well as, The fixture is used to clamp the welding structure of the battery cell tab.

9. The welding device according to claim 8, characterized in that The welding head comprises: a mounting plate; A buckle cover, which is disposed on the mounting plate and is surrounded together with the mounting plate to form a cavity; A first gear, mounted in the cavity; A second gear, installed in the cavity and meshing with the first gear; A welding head body, fixedly connected to the first gear; A driving motor is mounted on the mounting plate or the buckle cover and is drivingly connected to the second gear.

10. The welding device according to claim 9, characterized in that The first gear comprises: a tooth body installed in the cavity and meshing with the second gear; An intermediate piece is formed by radially extending from the tooth body; a hub body, on which the welding head body is mounted; and Connecting pieces are used to connect the intermediate piece and the hub body respectively.

Images