Ultrasonic horn structure, ultrasonic welding apparatus, and battery

Abstract

This invention belongs to the field of battery technology and discloses an ultrasonic welding head structure, ultrasonic welding equipment, and a battery. The ultrasonic welding head structure includes a first welding head and a second welding head. The thickness of the first electrode tab is t1. The first welding head includes a first welding head body and a first welding tooth. The first welding tooth is disposed on the first welding head body and has a tooth height of h1, a1≤h1 / t1≤b1, where a1 is a first preset minimum value and b1 is a first preset maximum value. The thickness of the second electrode tab is t2. The second welding head includes a second welding head body and a second welding tooth. The second welding tooth is disposed on the second welding head body and has a tooth height of h2, a2≤h2 / t2≤b2, where a2 is a second preset minimum value and b2 is a second preset maximum value. The hardness of the first electrode tab is less than that of the second electrode tab, and the thickness of the first electrode tab is greater than that of the second electrode tab, a1>a2, b1<b2, in order to improve the welding yield of the first electrode tab and the first adapter piece.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to an ultrasonic welding head structure, ultrasonic welding equipment, and battery. Background Technology

[0002] In existing technologies, ultrasonic welding equipment is often used to weld tabs and adapters. However, the welding yield of tabs and adapters is generally low. This problem seriously reduces the production efficiency of the production line and causes material scrap. Under mechanical impact conditions, the connection between the tabs and adapters is at high risk of failure, which reduces the reliability of battery products.

[0003] Therefore, there is an urgent need to propose an ultrasonic welding head structure, ultrasonic welding equipment, and battery to solve the above-mentioned technical problems. Summary of the Invention

[0004] The first objective of this invention is to provide an ultrasonic welding head structure that can improve the welding yield between the first electrode tab and the first adapter piece.

[0005] To achieve this objective, the present invention adopts the following technical solution: The ultrasonic welding head structure includes: The first welding head is used to weld the first electrode tab and the first adapter piece of the same material. The thickness of the first electrode tab is t1. The first welding head includes the first welding head body and the first welding tooth. The first welding tooth is set on the first welding head body. The tooth height of the first welding tooth is h1, a1≤h1 / t1≤b1, a1 is the first preset minimum value, and b1 is the first preset maximum value. The second welding head is used to weld the second electrode and the second adapter piece of the same material. The thickness of the second electrode is t2. The second welding head includes a second welding head body and a second welding tooth. The second welding tooth is set on the second welding head body. The tooth height of the second welding tooth is h2, a2≤h2 / t2≤b2, a2 ​​is the second preset minimum value, and b2 is the second preset maximum value. The hardness of the first electrode tab is less than that of the second electrode tab, the thickness of the first electrode tab is greater than that of the second electrode tab, a1>a2, b1<b2.

[0006] Optionally, a1 ≥ 0.57, b1 ≤ 1.01; And / or, a2≥0.49, b2≤1.1.

[0007] Optionally, 0.24mm≤t1≤1.44mm, 0.14mm≤h1≤1.44mm, 0.12mm≤t2≤0.72mm, and 0.06mm≤h2≤0.79mm.

[0008] Optionally, both the first welding tooth and the second welding tooth are frustum-shaped. The first welding tooth has a first large bottom surface and a first small bottom surface, and the first large bottom surface is connected to the first welding head body. The second welding tooth has a second large bottom surface and a second small bottom surface, and the second large bottom surface is connected to the second welding head body.

[0009] Optionally, there are multiple first welding teeth, which are arranged in a first rectangular array on the first welding head body. In the row direction and column direction of the first rectangular array, the distance between the first small bottom surfaces of two adjacent first welding teeth facing the same side is w1, 0.21mm≤w1≤4mm.

[0010] Alternatively, 1.45 ≤ w1 / h1 ≤ 2.85.

[0011] Optionally, there are multiple second welding teeth, which are arranged in a second rectangular array on the second welding head body. In the row direction and column direction of the second rectangular array, the distance between the second small bottom surfaces of two adjacent second welding teeth facing the same side is w2, 0.078mm≤w2≤2.37mm.

[0012] Optionally, 1.25 ≤ w2 / h2 ≤ 3.05.

[0013] A second objective of this invention is to provide an ultrasonic welding apparatus that can improve the welding yield of a first electrode tab and a first adapter piece.

[0014] To achieve this objective, the present invention adopts the following technical solution: Ultrasonic welding equipment, including the ultrasonic welding head structure described above.

[0015] A third objective of the present invention is to provide a battery in which the connection between the first tab and the first adapter piece is highly reliable.

[0016] To achieve this objective, the present invention adopts the following technical solution: The battery includes an electrode assembly, a first tab, a second tab, a first adapter plate, and a second adapter plate. One end of the first tab is connected to the electrode assembly, and the other end is welded and fixed to the first adapter plate using the first welding head of the aforementioned ultrasonic welding equipment. One end of the second tab is connected to the electrode assembly, and the other end is welded and fixed to the second adapter plate using the second welding head of the aforementioned ultrasonic welding equipment. The first tab and the first adapter plate are made of the same material, and the second tab and the second adapter plate are made of the same material. The hardness of the first tab is less than that of the second tab, and the thickness of the first tab is greater than that of the second tab.

[0017] The beneficial effects of this invention are: This ultrasonic welding head structure takes into account the hardness and thickness differences between the first and second electrodes, as well as the hardness differences between the first and second adapter pieces. This allows the first welding head to weld the first electrode and the first adapter piece, and the second welding head to weld the second electrode and the second adapter piece. Furthermore, it ensures that the first preset minimum value a1 is greater than the second preset minimum value a2, and the first preset maximum value b1 is less than the second preset maximum value b2. This ensures that the ratio of h1 to t1 can still improve the welding yield of the first electrode and the first adapter piece, even when both the minimum and maximum conditions are met. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the battery structure provided by the present invention; Figure 2 This is a partially enlarged structural diagram of the first welding head, the first electrode tab, and the first adapter piece provided by the present invention; Figure 3 This is a front view of the first welding head provided by the present invention; Figure 4 This is a partially enlarged structural schematic diagram of the second welding head, the second electrode tab, and the second adapter piece provided by the present invention; Figure 5 This is a front view of the second welding head provided by the present invention; Figure 6 This is a top view of the first welding head provided by the present invention; Figure 7 This is a top view of the second welding head provided by the present invention.

[0019] In the picture: 10. First electrode tab; 20. First adapter plate; 30. Second electrode tab; 40. Second adapter plate; 50. Electrode assembly; 100, First welding head; 110, First welding head body; 120, First welding tooth; 121, First large bottom surface; 122, First small bottom surface; 200, Second welding head; 210, Second welding head body; 220, Second welding tooth; 221, Second large bottom surface; 222, Second small bottom surface. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] This embodiment provides an ultrasonic welding head structure mainly applicable to square batteries. This ultrasonic welding head structure can improve the welding yield of the first electrode tab and the first adapter piece.

[0025] Specifically, such as Figures 1 to 5As shown, the ultrasonic welding head structure includes a first welding head 100 and a second welding head 200. The first welding head 100 is used to weld a first electrode 10 and a first adapter piece 20 made of the same material. The thickness of the first electrode 10 is t1. The first welding head 100 includes a first welding head body 110 and a first welding tooth 120. The first welding tooth 120 is disposed on the first welding head body 110, and the tooth height of the first welding tooth 120 is h1, a1≤h1 / t1≤b1, where a1 is a first preset minimum value and b1 is a first preset maximum value. The second welding head 200 is used to weld a second electrode 30 and a second adapter piece 40 made of the same material. The thickness of the second electrode 30 is t2. The second welding head 200 includes a second welding head body 210 and a second welding tooth 220. The second welding tooth 220 is disposed on the second welding head body 210, and the tooth height of the second welding tooth 220 is h2, a2≤h2 / t2≤b2, where a2 is a second preset minimum value and b2 is a second preset maximum value. The hardness of the first tab 10 is less than that of the second tab 30, the thickness of the first tab 10 is greater than that of the second tab 30, a1>a2, b1<b2.

[0026] This ultrasonic welding head structure takes into account the hardness and thickness differences between the first tab 10 and the second tab 30, as well as the hardness difference between the first adapter piece 20 and the second adapter piece 40. This allows the first welding head 100 to weld the first tab 10 and the first adapter piece 20, and the second welding head 200 to weld the second tab 30 and the second adapter piece 40. Furthermore, it ensures that the first preset minimum value a1 is greater than the second preset minimum value a2, and the first preset maximum value b1 is less than the second preset maximum value b2. This ensures that the ratio of h1 to t1 can still improve the welding yield of the first tab 10 and the first adapter piece 20, even under the minimum and maximum conditions. This, in turn, improves production line efficiency, reduces material waste, and enhances the reliability of battery products.

[0027] Specifically, a tab is typically formed by stacking multiple sub-tabs sequentially. The positive electrode sub-tab has more layers than the negative electrode sub-tab, meaning the positive electrode tab is thicker than the negative electrode tab. Furthermore, the positive electrode tab and positive electrode adapter are usually made of aluminum, while the negative electrode tab and negative electrode adapter are usually made of copper. This means the hardness of the positive electrode tab is less than that of the negative electrode tab, and the hardness of the positive electrode adapter is less than that of the negative electrode adapter. If the same welding head is used to weld the positive electrode tab and positive electrode adapter, and the negative electrode tab and negative electrode adapter, the aforementioned differences in thickness and material hardness cannot be simultaneously accounted for, thus making it impossible to simultaneously achieve the welding yield of the positive electrode tab to the positive electrode adapter and the welding yield of the negative electrode tab to the negative electrode adapter.

[0028] In this embodiment, the first electrode 10 is formed by stacking multiple first sub-electrodes sequentially. The first electrode 10 is an aluminum positive electrode, and the first adapter piece 20 is an aluminum positive adapter piece. The second electrode 30 is formed by stacking multiple second sub-electrodes sequentially. The second electrode 30 is a copper negative electrode, and the second adapter piece 40 is a copper negative adapter piece. The thickness of the first electrode 10 is greater than the thickness of the second electrode 30, meaning that the number of layers of the first sub-electrodes is greater than the number of layers of the second sub-electrodes. Furthermore, the first adapter piece 20 has a lower hardness compared to the second adapter piece 40. When the first welding head 100 presses the first electrode 10 and the first adapter piece 20 together along the -z direction, the multiple first sub-electrodes are first deformed and pressed together along the -z direction to form the first electrode 10, and then the first electrode 10 and the first adapter piece 20 are pressed together. Because the first sub-tab has many layers (i.e., the first tab 10 is relatively thick), it is easy for several first sub-tabs near the first adapter piece 20 to not be pressed together, and it is also easy for the first tab 10 to not be pressed together with the first adapter piece 20. In other words, it is easy for the first welding tooth 120 to fail to press the first tab 10 into the first adapter piece 20. In addition, because the first adapter piece 20 has low hardness, during the pressing process, the first adapter piece 20 is prone to deform along the -z direction with the first tab 10. That is, the first adapter piece 20 cannot provide good support for the first tab 10 in the +z direction, which leads to low connection strength between the first tab 10 and the first adapter piece 20, or even the first welding tooth 120 failing to press the first tab 10 into the first adapter piece 20. When the second welding head 200 presses the second electrode tab 30 and the second adapter piece 40 along the -z direction, multiple second sub-electrode tabs are first deformed and pressed together along the -z direction to form the second electrode tab 30. Then, the second electrode tab 30 and the second adapter piece 40 are pressed together. Because the number of layers of the second sub-electrode tabs is small (i.e., the second electrode tab 30 is thinner), all the second sub-electrode tabs are more easily pressed together to form the second electrode tab 30, and the second electrode tab 30 is also more easily pressed together with the second adapter piece 40. In addition, because the second adapter piece 40 has high hardness, during the pressing process, the second adapter piece 40 can provide good support for the second electrode tab 30 along the +z direction, so that the second electrode tab 30 and the second adapter piece 40 are reliably pressed together. In this embodiment, the minimum value of h1 / t1 is made greater than the minimum value of h2 / t2, that is, a1 is greater than a2, so that even when the ratio of h1 to t1 is minimized, the first welding tooth 120 can still reliably press the first electrode tab 10 and the first adapter piece 20 together.

[0029] Furthermore, since the hardness of the first tab 10 is less than that of the second tab 30, the first tab 10 is more likely to tear during the crimping process. Also, since the hardness of the first adapter piece 20 is less than that of the second adapter piece 40, the supporting force provided by the first adapter piece 20 to the first tab 10 during the crimping process is less than the supporting force provided by the second adapter piece 40 to the second tab 30, which further increases the tearing probability of the first tab 10. To reduce the tearing probability of the first tab 10, in this embodiment, the maximum value of h1 / t1 is less than the maximum value of h2 / t2, i.e., b1 < b2, so that even when the ratio of h1 to t1 is at its maximum, the problem of the first welding tooth 120 cracking the first tab 10 can still be avoided.

[0030] It should be noted that the thickness t1 of the first electrode 10 mentioned above refers to the thickness of the first electrode 10 before it is welded to the first adapter piece 20. The thickness t2 of the second electrode 30 mentioned above refers to the thickness of the second electrode 30 before it is welded to the second adapter piece 40.

[0031] In other embodiments, the first tab 10, the second tab 30, the first adapter piece 20, and the second adapter piece 40 may also be made of other materials, and the first tab 10 may be the negative tab and the second tab 30 may be the positive tab, as long as the hardness of the first tab 10 is less than the hardness of the second tab 30, and the thickness of the first tab 10 is greater than the thickness of the second tab 30.

[0032] Optionally, a1 ≥ 0.57, b1 ≤ 1.01. For example, a1 can be 0.57, 0.6, or 0.73, etc., and b1 can be 1.01, 1.0, or 0.86, etc. That is, the minimum value of h1 / t1 is 0.57, and the maximum value of h1 / t1 is 1.01. If h1 / t1 is too small, that is, h1 / t1 is less than 0.57, the first welding tooth 120 will not press the first electrode 10 into the first adapter piece 20 to a sufficient depth, which will reduce the connection strength between the first electrode 10 and the first adapter piece 20. If h1 / t1 is too large, that is, h1 / t1 is greater than 1.01, the first welding tooth 120 is prone to cracking the first electrode 10 when pressing the first electrode 10 and the first adapter piece 20, and thus, during testing and use, the welding area between the first electrode 10 and the first adapter piece 20 is prone to tearing due to external vibration and impact.

[0033] Optionally, a2 ≥ 0.49, b2 ≤ 1.1. For example, a2 can be 0.49, 0.5, or 0.68, etc., and b2 can be 1.1, 0.8, or 0.65, etc. That is, the minimum value of h2 / t2 is 0.49, and the maximum value of h2 / t2 is 1.1. If h2 / t2 is too small, i.e., h2 / t2 is less than 0.49, the second welding tooth 220 will not press the second electrode 30 into the second adapter piece 40 to a sufficient depth, which will reduce the connection strength between the second electrode 30 and the second adapter piece 40. If h2 / t2 is too large, i.e., h2 / t2 is greater than 1.1, the second welding tooth 220 is prone to cracking the second electrode 30 when pressing it against the second adapter piece 40, which will easily cause the welding area between the second electrode 30 and the second adapter piece 40 to tear due to vibration and impact during testing and use.

[0034] Optionally, 0.24mm ≤ t1 ≤ 1.44mm, where t1 can be, for example, 0.24mm, 0.38mm, 1.05mm, or 1.44mm, etc. 0.14mm ≤ h1 ≤ 1.44mm, where h1 can be, for example, 0.14mm, 0.58mm, 1.17mm, or 1.44mm, etc. This ensures that the first welding head 100, based on a1 ≤ h1 / t1 ≤ b1, is suitable for first tabs 10 of most common thicknesses. 0.12mm ≤ t2 ≤ 0.72mm, where t2 can be, for example, 0.12mm, 0.36mm, 0.61mm, or 0.72mm, etc. 0.06mm ≤ h2 ≤ 0.79mm, where h2 can be, for example, 0.06mm, 0.33mm, 0.62mm, or 0.79mm, etc. So that the second welding head 200 can be used for most common thicknesses of the second electrode tab 30, based on the condition that a2≤h2 / t2≤b2.

[0035] Optionally, the ultrasonic welding head structure provided in this embodiment is suitable for square batteries. Compared to other types of batteries, the tabs and adapter plates of square batteries are thicker, and the adapter plates have higher hardness. In this embodiment, such as... Figures 3 to 7 As shown, both the first welding tooth 120 and the second welding tooth 220 are frustoconical in shape. The first welding tooth 120 has a first large bottom surface 121 and a first small bottom surface 122. The first large bottom surface 121 is connected to the first welding head body 110, and the first small bottom surface 122 is used to press the first electrode tab 10 and the first adapter piece 20 together. The second welding tooth 220 has a second large bottom surface 221 and a second small bottom surface. The second large bottom surface 221 is connected to the second welding head body 210, and the second small bottom surface 222 is used to press the second electrode tab 30 and the second adapter piece 40 together, so as to improve the connection strength between the first electrode tab 10 and the first adapter piece 20, and the connection strength between the second electrode tab 30 and the second adapter piece 40.

[0036] Furthermore, there are multiple first welding teeth 120, which are arranged in a first rectangular array on the first welding head body 110. In the row direction (x-direction) and column direction (y-direction) of the first rectangular array, the distance between the first small bottom surfaces 122 of two adjacent first welding teeth 120 facing the same side is w1, 0.21mm≤w1≤4mm. For example, w1 can be 0.21mm, 1.62mm, 2.38mm, or 4mm, etc. This structure makes the arrangement of multiple first welding teeth 120 more regular and maintains a suitable distance between two adjacent first welding teeth 120, which is conducive to improving the welding yield of the first electrode 10 and the first adapter piece 20. When the first electrode 10 and / or the first adapter piece 20 are subjected to force due to vibration and impact, the welding area of ​​the first electrode 10 and the first adapter piece 20 is subjected to force more evenly, reducing the probability of tearing in the welding area.

[0037] Furthermore, there are multiple second welding teeth 220, arranged in a second rectangular array on the second welding head body 210. In the row direction (x-direction) and column direction (y-direction) of the second rectangular array, the distance between the second small bottom surfaces 222 of two adjacent second welding teeth 220 facing the same side is w2, 0.078mm ≤ w2 ≤ 2.37mm. For example, w2 can be 0.078mm, 0.51mm, 1.68mm, or 2.37mm, etc. This structure makes the arrangement of the multiple second welding teeth 220 more regular and maintains a suitable distance between adjacent second welding teeth 220, thereby improving the welding yield of the second electrode 30 and the second adapter piece 40. When the second electrode 30 and / or the second adapter piece 40 are subjected to vibration and impact, the welding area of ​​the second electrode 30 and the second adapter piece 40 is subjected to more uniform stress, reducing the probability of tearing in the welding area.

[0038] Optionally, 1.45 ≤ w1 / h1 ≤ 2.85. For example, w1 / h1 can be 1.45, 1.5, 2.33, 2.8, or 2.85. If w1 / h1 is too small, i.e., w1 / h1 is less than 1.45, the first welding tooth 120 may easily crack the first electrode 10 when pressing it against the first electrode 10 and the first adapter piece 20. Consequently, during testing and use, the welding area between the first electrode 10 and the first adapter piece 20 may tear due to external vibration and impact. If w1 / h1 is too large, i.e., w1 / h1 is greater than 2.85, the first welding tooth 120 may not press the first electrode 10 into the first adapter piece 20 deeply enough, which will reduce the connection strength between the first electrode 10 and the first adapter piece 20.

[0039] Optionally, 1.25 ≤ w2 / h2 ≤ 3.05. For example, w2 / h2 can be 1.25, 1.3, 2.25, 3, or 3.05, etc. If w2 / h2 is too small, i.e., w2 / h2 is less than 1.25, the second welding tooth 220 may easily crack the second electrode 30 when pressing it against the second electrode 30 and the second adapter piece 40. Consequently, during testing and use, the welding area between the second electrode 30 and the second adapter piece 40 may tear due to external vibration and impact. If w2 / h2 is too large, i.e., w2 / h2 is greater than 3.05, the second welding tooth 220 may not press the second electrode 30 into the second adapter piece 40 deeply enough, which will reduce the connection strength between the second electrode 30 and the second adapter piece 40.

[0040] Optionally, the first welding tooth 120 is a regular square frustum, and the side length of the first large base 121 of the first welding tooth 120 is n1, 0.2mm≤n1≤3mm. For example, n1 can be 0.2mm, 1.5mm or 3mm, etc., to improve the reliability of the connection between the first welding tooth 120 and the first welding head body 110.

[0041] Optionally, the second welding tooth 220 is a regular square frustum, and the side length of the second large base 221 of the second welding tooth 220 is n2, 0.2mm≤n2≤3mm. For example, n2 can be 0.2mm, 1.5mm or 3mm, etc., to improve the reliability of the connection between the second welding tooth 220 and the second welding head body 210.

[0042] Table 1 below provides eight sets of exemplary and eight sets of comparative examples. The exemplary examples are ultrasonic welding head structures that satisfy 0.57≤h1 / t1≤1.01, 1.45≤w1 / h1≤2.85, 0.49≤h2 / t2≤1.1, and 1.25≤w2 / h2≤3.05. The comparative examples are ultrasonic welding head structures that do not satisfy 0.57≤h1 / t1≤1.01, 1.45≤w1 / h1≤2.85, 0.49≤h2 / t2≤1.1, or 1.25≤w2 / h2≤3.05. Except for the differences mentioned above, the experimental and production conditions for the eight exemplary and eight comparative examples are the same, and will not be repeated here. In Example 1, t1 is 0.36mm, h1 is 0.22mm, w1 is 0.35mm, t2 is 0.18mm, h2 is 0.11mm, w2 is 0.22mm, h1 / t1 is 0.61, w1 / h1 is 1.6, h2 / t2 is 0.6, and w2 / h2 is 2. During ultrasonic welding, neither the first electrode tab 10 nor the second electrode tab 30 experienced cracking. The connection strength between the first electrode tab 10 and the first adapter piece 20 was high, and the connection strength between the second electrode tab 30 and the second adapter piece 40 was also high.

[0043] In Example 2, t1 is 0.6mm, h1 is 0.59mm, w1 is 1.47mm, t2 is 0.3mm, h2 is 0.24mm, w2 is 0.36mm, h1 / t1 is 0.98, w1 / h1 is 2.5, h2 / t2 is 0.8, and w2 / h2 is 1.5. During ultrasonic welding, neither the first electrode 10 nor the second electrode 30 experienced cracking. The connection strength between the first electrode 10 and the first adapter piece 20 was high, and the connection strength between the second electrode 30 and the second adapter piece 40 was also high.

[0044] In Example 3, t1 is 0.96mm, h1 is 0.77mm, w1 is 1.15mm, t2 is 0.48mm, h2 is 0.48mm, w2 is 0.86mm, h1 / t1 is 0.8, w1 / h1 is 1.5, h2 / t2 is 1, and w2 / h2 is 1.8. During ultrasonic welding, neither the first electrode tab 10 nor the second electrode tab 30 experienced cracking. The connection strength between the first electrode tab 10 and the first adapter piece 20 was high, and the connection strength between the second electrode tab 30 and the second adapter piece 40 was also high.

[0045] In Example 4, t1 is 0.6mm, h1 is 0.48mm, w1 is 1.3mm, t2 is 0.3mm, h2 is 0.18mm, w2 is 0.5mm, h1 / t1 is 0.8, w1 / h1 is 2.7, h2 / t2 is 0.6, and w2 / h2 is 2.8. During ultrasonic welding, neither the first electrode tab 10 nor the second electrode tab 30 experienced cracking. The connection strength between the first electrode tab 10 and the first adapter piece 20 was high, and the connection strength between the second electrode tab 30 and the second adapter piece 40 was also high.

[0046] In Example 5, t1 is 1.2mm, h1 is 0.84mm, w1 is 1.51mm, t2 is 0.6mm, h2 is 0.32mm, w2 is 0.7mm, h1 / t1 is 0.7, w1 / h1 is 1.8, h2 / t2 is 0.53, and w2 / h2 is 2.2. During ultrasonic welding, neither the first electrode tab 10 nor the second electrode tab 30 experienced cracking. The connection strength between the first electrode tab 10 and the first adapter piece 20 was high, and the connection strength between the second electrode tab 30 and the second adapter piece 40 was also high.

[0047] In Example 6, t1 is 0.3mm, h1 is 0.26mm, w1 is 0.46mm, t2 is 0.15mm, h2 is 0.16mm, w2 is 0.32mm, h1 / t1 is 0.86, w1 / h1 is 1.8, h2 / t2 is 1.08, and w2 / h2 is 2. During ultrasonic welding, neither the first electrode tab 10 nor the second electrode tab 30 experienced cracking. The connection strength between the first electrode tab 10 and the first adapter piece 20 was high, and the connection strength between the second electrode tab 30 and the second adapter piece 40 was also high.

[0048] In Example 7, t1 is 0.6mm, h1 is 0.48mm, w1 is 0.96mm, t2 is 0.3mm, h2 is 0.24mm, w2 is 0.34mm, h1 / t1 is 0.8, w1 / h1 is 2, h2 / t2 is 0.8, and w2 / h2 is 1.4. During ultrasonic welding, neither the first electrode tab 10 nor the second electrode tab 30 experienced cracking. The connection strength between the first electrode tab 10 and the first adapter piece 20 was high, and the connection strength between the second electrode tab 30 and the second adapter piece 40 was also high.

[0049] In Example 8, t1 is 1.2mm, h1 is 0.84mm, w1 is 1.51mm, t2 is 0.6mm, h2 is 0.54mm, w2 is 1.62mm, h1 / t1 is 0.7, w1 / h1 is 1.8, h2 / t2 is 0.9, and w2 / h2 is 3. During ultrasonic welding, neither the first electrode tab 10 nor the second electrode tab 30 experienced cracking. The connection strength between the first electrode tab 10 and the first adapter piece 20 was high, and the connection strength between the second electrode tab 30 and the second adapter piece 40 was also high.

[0050] In Comparative Example 1, t1 is 0.36mm, h1 is 0.18mm, w1 is 0.42mm, t2 is 0.18mm, h2 is 0.11mm, w2 is 0.22mm, h1 / t1 is 0.5, w1 / h1 is 2, h2 / t2 is 0.6, w2 / h2 is 2, and h1 / t1 < 0.57. The connection strength between the first electrode tab 10 and the first adapter piece 20 is low, and the first electrode tab 10 and the first adapter piece 20 will detach during the vibration and impact test.

[0051] In Comparative Example 2, t1 is 0.6mm, h1 is 0.61mm, w1 is 1.53mm, t2 is 0.3mm, h2 is 0.24mm, w2 is 0.36mm, h1 / t1 is 1.02, w1 / h1 is 2.5, h2 / t2 is 0.8, w2 / h2 is 1.5, and h1 / t1 > 1.01. The first welding tooth 120 is prone to cracking the first electrode tab 10. During the vibration and impact test, the connection area between the first electrode tab 10 and the first adapter piece 20 tears.

[0052] In Comparative Example 3, t1 is 0.96mm, h1 is 0.77mm, w1 is 1.08mm, t2 is 0.48mm, h2 is 0.48mm, w2 is 0.86mm, h1 / t1 is 0.8, w1 / h1 is 1.4, h2 / t2 is 1, w2 / h2 is 1.8, w1 / h1 < 1.45, the first welding tooth 120 is easily crushed by the first electrode tab 10, and during the vibration and impact test, the connection area between the first electrode tab 10 and the first adapter piece 20 tears.

[0053] In Comparative Example 4, t1 is 0.6mm, h1 is 0.48mm, w1 is 1.39mm, t2 is 0.3mm, h2 is 0.18mm, w2 is 0.5mm, h1 / t1 is 0.8, w1 / h1 is 2.9, h2 / t2 is 0.6, w2 / h2 is 2.8, and w1 / h1 > 2.85. The connection strength between the first electrode tab 10 and the first adapter piece 20 is low, and the first electrode tab 10 and the first adapter piece 20 will detach during the vibration and shock test.

[0054] In Comparative Example 5, t1 is 1.2mm, h1 is 0.84mm, w1 is 1.51mm, t2 is 0.6mm, h2 is 0.29mm, w2 is 0.63mm, h1 / t1 is 0.7, w1 / h1 is 1.8, h2 / t2 is 0.48, w2 / h2 is 2.2, and h2 / t2 < 0.49. The connection strength between the second electrode tab 30 and the second adapter piece 40 is low, and the second electrode tab 30 and the second adapter piece 40 detach during vibration and shock testing.

[0055] In Comparative Example 6, t1 is 0.3mm, h1 is 0.26mm, w1 is 0.46mm, t2 is 0.15mm, h2 is 0.17mm, w2 is 0.33mm, h1 / t1 is 0.86, w1 / h1 is 1.8, h2 / t2 is 1.11, w2 / h2 is 2, and h2 / t2 > 1.1. The second welding tooth 220 is prone to cracking the second electrode tab 30. During the vibration and impact test, the connection area between the second electrode tab 30 and the second adapter piece 40 tears.

[0056] In Comparative Example 7, t1 is 0.6 mm, h1 is 0.48 mm, w1 is 0.96 mm, t2 is 0.3 mm, h2 is 0.24 mm, w2 is 0.29 mm, h1 / t1 is 0.8, w1 / h1 is 2, h2 / t2 is 0.8, w2 / h2 is 1.2, and w2 / h2 < 1.25. The second welding tooth 220 is prone to cracking the second electrode tab 30. During the vibration and impact test, the connection area between the second electrode tab 30 and the second adapter piece 40 tears.

[0057] In Comparative Example 8, t1 is 1.2mm, h1 is 0.84mm, w1 is 1.51mm, t2 is 0.6mm, h2 is 0.54mm, w2 is 1.67mm, h1 / t1 is 0.7, w1 / h1 is 1.8, h2 / t2 is 0.9, w2 / h2 is 3.1, and w2 / h2 > 3.05. The connection strength between the second electrode tab 30 and the second adapter piece 40 is low, and the second electrode tab 30 and the second adapter piece 40 detach during the vibration and shock test.

[0058] It is evident that when the ultrasonic welding head structure simultaneously satisfies 0.57≤h1 / t1≤1.01, 1.45≤w1 / h1≤2.85, 0.49≤h2 / t2≤1.1, and 1.25≤w2 / h2≤3.05, it can ensure reliable connection strength between the first electrode 10 and the first adapter piece 20, and reliable connection strength between the second electrode 30 and the second adapter piece 40. At the same time, it can also avoid the problem of the first electrode 10 and the second electrode 30 being crushed during ultrasonic welding.

[0059] This embodiment also provides an ultrasonic welding device, which includes the ultrasonic welding head structure described above. It can take into account the hardness and thickness differences between the first electrode 10 and the second electrode 30, as well as the hardness difference between the first adapter piece 20 and the second adapter piece 40, thereby improving the welding yield of the first electrode 10 and the first adapter piece 20.

[0060] This embodiment also provides a battery, which includes an electrode assembly 50, a first tab 10, a second tab 30, a first adapter piece 20, and a second adapter piece 40. One end of the first tab 10 is connected to the electrode assembly 50, and the other end is welded and fixed to the first adapter piece 20 using the first welding head 100 of the ultrasonic welding equipment described above. One end of the second tab 30 is connected to the electrode assembly 50, and the other end is welded and fixed to the second adapter piece 40 using the second welding head 200 of the ultrasonic welding equipment described above. The first tab 10 and the first adapter piece 20 are made of the same material, and the second tab 30 and the second adapter piece 40 are made of the same material. The hardness of the first tab 10 is less than that of the second tab 30, and the thickness of the first tab 10 is greater than that of the second tab 30. The battery uses the first welding head 100 to connect the first tab 10 and the first adapter piece 20, and uses the second welding head 200 to connect the second tab 30 and the second adapter piece 40. This takes into account the differences in hardness and thickness between the first tab 10 and the second tab 30, as well as the differences in hardness between the first adapter piece 20 and the second adapter piece 40, which helps to improve the welding yield of the first tab 10 and the first adapter piece 20.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An ultrasonic welding head structure, characterized in that, include: A first welding head (100) is used to weld a first electrode tab (10) and a first adapter piece (20) of the same material. The thickness of the first electrode tab (10) is t1. The first welding head (100) includes a first welding head body (110) and a first welding tooth (120). The first welding tooth (120) is disposed on the first welding head body (110). The tooth height of the first welding tooth (120) is h1, a1≤h1 / t1≤b1, a1 is a first preset minimum value, and b1 is a first preset maximum value. The second welding head (200) is used to weld the second electrode (30) and the second adapter piece (40) of the same material. The thickness of the second electrode (30) is t2. The second welding head (200) includes a second welding head body (210) and a second welding tooth (220). The second welding tooth (220) is disposed on the second welding head body (210). The tooth height of the second welding tooth (220) is h2, a2≤h2 / t2≤b2, a2 ​​is the second preset minimum value, and b2 is the second preset maximum value. The hardness of the first electrode tab (10) is less than that of the second electrode tab (30), the thickness of the first electrode tab (10) is greater than that of the second electrode tab (30), a1>a2, b1<b2.

2. The ultrasonic welding head structure according to claim 1, characterized in that, a1≥0.57, b1≤1.01; And / or, a2≥0.49, b2≤1.

1.

3. The ultrasonic welding head structure according to claim 1 or 2, characterized in that, 0.24mm≤t1≤1.44mm, 0.14mm≤h1≤1.44mm, 0.12mm≤t2≤0.72mm, 0.06mm≤h2≤0.79mm.

4. The ultrasonic welding head structure according to claim 3, characterized in that, Both the first welding tooth (120) and the second welding tooth (220) are frustum-shaped. The first welding tooth (120) has a first large bottom surface (121) and a first small bottom surface (122). The first large bottom surface (121) is connected to the first welding head body (110). The second welding tooth (220) has a second large bottom surface (221) and a second small bottom surface (222). The second large bottom surface (221) is connected to the second welding head body (210).

5. The ultrasonic welding head structure according to claim 4, characterized in that, The number of the first welding teeth (120) is multiple, and the multiple first welding teeth (120) are arranged in a first rectangular array on the first welding head body (110). In the row direction and column direction of the first rectangular array, the distance between the first small bottom surface (122) of two adjacent first welding teeth (120) facing the same side is w1, 0.21mm≤w1≤4mm.

6. The ultrasonic welding head structure according to claim 5, characterized in that, 1.45≤w1 / h1≤2.

85.

7. The ultrasonic welding head structure according to claim 4, characterized in that, The number of the second welding teeth (220) is multiple, and the multiple second welding teeth (220) are arranged in a second rectangular array on the second welding head body (210). In the row direction and column direction of the second rectangular array, the distance between the second small bottom surface (222) of two adjacent second welding teeth (220) facing the same side is w2, 0.078mm≤w2≤2.37mm.

8. The ultrasonic welding head structure according to claim 7, characterized in that, 1.25≤w2 / h2≤3.

05.

9. An ultrasonic welding equipment, characterized in that, Includes the ultrasonic welding head structure as described in any one of claims 1-8.

10. A battery, characterized in that, The device includes an electrode assembly (50), a first electrode tab (10), a second electrode tab (30), a first adapter plate (20), and a second adapter plate (40). One end of the first electrode tab (10) is connected to the electrode assembly (50), and the other end is welded and fixed to the first adapter plate (20) using the first welding head (100) of the ultrasonic welding device as described in claim 9. One end of the second electrode tab (30) is connected to the electrode assembly (50), and the other end is welded and fixed to the second adapter plate (40) using the second welding head (200) of the ultrasonic welding device as described in claim 9. The first electrode tab (10) and the first adapter plate (20) are made of the same material, and the second electrode tab (30) and the second adapter plate (40) are made of the same material. The hardness of the first electrode tab (10) is less than that of the second electrode tab (30), and the thickness of the first electrode tab (10) is greater than that of the second electrode tab (30).

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