Battery assembly and battery

Abstract

The utility model discloses a battery assembly and battery, the battery assembly includes: electric core, the electric core has the tab, the adapter piece, the adapter piece includes two piece bodies and connecting body, two the piece body is connected through connecting body and can fold oppositely around connecting body, at least one piece body is equipped with tab welding portion, the tab is pressed between two piece bodies, and is fixed through tab welding portion welding, the pole post connects portion is used for and the pole post connection of battery. The battery uses above-mentioned battery assembly. The battery assembly will the tab of electric core weld between the adapter piece of two piece bodies, utilize piece body as the buffer layer of ultrasonic welding, alleviate the direct action of ultrasonic vibration to tab, thereby reduce the tearing risk of tab, simultaneously, the piece body can also disperse the welding pressure that tab received, and the pressure is dispersed to the area of greater, avoid the tearing of tab partial pressure too big and produce.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, specifically a battery component and a battery. Background Technology

[0002] Lithium-ion batteries, with their high energy density, long cycle life, and low self-discharge rate, have become the mainstream energy storage device. In the manufacturing process of lithium-ion batteries, ultrasonic welding is commonly used to weld the tabs. However, various factors during welding, such as excessive welding energy, excessive welding time, and inappropriate amplitude, can cause the tabs to tear. Tab tearing not only affects the quality and reliability of lithium-ion batteries but also increases production costs.

[0003] While existing technologies have attempted to address the tab tearing problem by improving welding parameters and enhancing welding equipment, the effects have been limited and have failed to fundamentally eliminate this risk. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this utility model provides a battery assembly and a battery. The battery assembly welds the tabs of the battery cell between two plates forming an adapter plate. The plates cover the tabs as a buffer layer for ultrasonic welding, reducing the direct effect of ultrasonic vibration on the tabs and thus reducing the risk of tearing. At the same time, the plates can also disperse the welding pressure on the tabs, distributing the pressure over a larger area to avoid excessive local pressure on the tabs and causing tearing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a battery assembly, comprising: The battery cell has tabs; The adapter plate includes two plates and a connector. The two plates are connected by the connector and can be folded relative to each other around the connector. At least one plate is provided with a tab welding part. The tab is sandwiched between the two plates and fixed by welding through the tab welding part.

[0006] Through the above technical solution, the battery assembly welds the electrode of the cell between two plates forming an adapter plate. The plates serve as a buffer layer for ultrasonic welding, reducing the direct effect of ultrasonic vibration on the electrode and thus reducing the risk of the electrode tearing. At the same time, the plates can also disperse the welding pressure on the electrode, distributing the pressure over a larger area to avoid excessive local pressure on the electrode, which could cause tearing.

[0007] Furthermore, the two sheets are symmetrically arranged about the connector, and the two sheets can be folded relative to the connector to fit together. Connecting the two sheets into one piece facilitates control over their relative positions and prevents them from shifting due to vibration during ultrasonic welding.

[0008] Furthermore, the thickness of the connector is less than or equal to half the thickness of the sheet. This application sets the thickness of the connector to half the thickness of the sheet. On the one hand, this thickness ensures that the connection between the two sheets will not be broken by ultrasonic vibration; on the other hand, this thickness results in low stress on the connector, which will not affect folding.

[0009] Furthermore, in the flattened state, the distance between two sheets is less than twice the thickness of the sheet and less than three times the thickness of the sheet. That is, the width of the free portion of the connector is greater than or equal to twice the thickness of the sheet, to allow sufficient space for the two connected sheets to fold properly. And the width of the free portion of the connector is less than or equal to three times the thickness of the sheet, limiting the connector's length and preventing it from affecting the folding effect.

[0010] Furthermore, the sheet body has a notch, and the electrode tab welding portions are distributed on both sides of the notch. The notch can prevent the electrode tab welding portions on both sides of the notch from interfering with each other. If the electrode tab and electrode tab welding portion on one side of the notch are welded, and then the electrode tab and electrode tab welding portion on the other side of the notch are welded, due to the design of the notch, the vibration of the second ultrasonic welding will not affect the electrode tab and electrode tab welding portion that was welded the first time, thus avoiding the electrode tab and electrode tab welding portion that was welded the first time from loosening.

[0011] Furthermore, an insulating pad is provided on the side of the adapter plate facing the battery cell. The insulating pad can prevent direct contact between the adapter plate and the battery cell, thereby avoiding short circuits and increasing the safety of the battery during installation and use. Furthermore, at least one of the plates is provided with a pole connection portion, which protrudes in a direction perpendicular to the plate to reduce the distance between the pole and the pole connection portion.

[0012] Furthermore, it includes at least two stacked battery cells, with the tabs of two adjacent battery cells respectively welded to the tab welding portions on both sides of the notch.

[0013] A battery using the above-described battery assembly includes: A housing having an opening, the battery cell being placed inside the housing; A cover body that fits over the opening of the housing, the cover body having a pole post that is connected to the adapter plate.

[0014] Based on the above technical solution, the beneficial effects of this utility model are as follows: The battery assembly disclosed in this application welds the tabs of the battery cell between two plates forming an adapter plate. The plates cover the tabs and act as a buffer layer for ultrasonic welding, reducing the direct effect of ultrasonic vibration on the tabs and thus reducing the risk of the tabs tearing. In this application, the sheet body can also disperse the welding pressure on the electrode tab, spreading the pressure over a larger area and preventing excessive local pressure on the electrode tab from causing tearing.

[0015] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the connection between the adapter plate and the electrode tab in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of the adapter piece in an embodiment of this utility model; Figure 3 This is an exploded view of the battery in an embodiment of this utility model.

[0018] The reference numerals in the above figures are as follows: 1. Battery cell; 11. Electrode tab; 2. Adapter piece; 21. Sheet body; 211. Notch; 22. Connector; 23. Electrode tab welding part; 24. Electrode post connection part; 3. Housing; 4. Cover. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] Example: Figure 1 As shown, this embodiment discloses a battery assembly, including: Battery cell 1, wherein the battery cell 1 has tabs 11.

[0022] The electrode tab 11 is welded inside the adapter piece 2. The adapter piece 2 includes two pieces 21, and the electrode tab 11 is welded between the two pieces 21. Figure 2 As shown, the two sheet bodies 21 are connected by a connector 22, and the two sheet bodies 21 can be folded relative to the connector 22.

[0023] By using the above technical solution, the two pieces 21 are connected into one piece, which makes it easier to control the relative position of the two pieces 21 and avoids the two pieces 21 shifting due to vibration during ultrasonic welding.

[0024] The thickness of the connector 22 is less than or equal to half the thickness of the sheet 21. In some feasible embodiments, the thickness of the connector 22 is set to half the thickness of the sheet 21. This thickness ensures that the connection between the two sheets 21 will not be broken by ultrasonic waves, and the stress on the connector 22 is low, which will not affect folding. In the flattened state, twice the thickness of the sheet 21 ≤ the distance between the two sheets 21 ≤ three times the thickness of the sheet 21. That is, the width of the free portion of the connector 22 is greater than or equal to twice the thickness of the sheet 21, so as to leave enough space to ensure that the two connected sheets 21 can be folded normally. Moreover, the width of the free portion of the connector 22 is less than or equal to three times the thickness of the sheet 21, which limits the connector 22 from being too long and avoids affecting the folding effect. If the connector 22 is too long, the two sheets 21 will not be able to fit with the tab 11 after folding relative to the connector 22.

[0025] like Figure 2 As shown, the sheet 21 has a notch 211, meaning the sheet 21 is U-shaped. The U-shaped sheet 21 has tab welding portions 23 on both sides of the notch 211, which are used to weld the tabs 11. The notch 211 prevents the tab welding portions 23 on both sides of the notch 211 from interfering with each other. If the tabs 11 and tab welding portions 23 on one side of the notch 211 are welded, and then the tabs 11 and tab welding portions 23 on the other side of the notch 211 are welded, due to the design of the notch 211, the vibration of the second ultrasonic welding will not affect the first welded tabs 11 and tab welding portions 23, thus preventing the first welded tabs 11 and tab welding portions 23 from loosening.

[0026] The U-shaped sheet 21 has a pole post connection part 24 on the side of its bottom edge away from the pole tab 11. The pole post connection part 24 protrudes in a direction perpendicular to the sheet 21 to reduce the gap between the pole and the pole post connection part 24, which facilitates subsequent welding.

[0027] An insulating pad is provided on the side of the adapter plate 2 facing the battery cell 1. The insulating pad can prevent direct contact between the adapter plate 2 and the battery cell 1, thereby avoiding short circuits and increasing the safety of the battery during installation and use.

[0028] Through the above technical solution, the battery assembly welds the tab 11 of the cell 1 between the adapter plate 2 composed of two sheets 21. Compared with the traditional solution that uses ultrasonic waves to directly act on the tab 11 to weld it to the adapter plate, this application uses the sheet 21 as a buffer layer for ultrasonic welding, which reduces the direct effect of ultrasonic vibration on the tab 11, thereby reducing the risk of tearing of the tab 11. At the same time, the sheet 21 can also disperse the welding pressure on the tab 11, distributing the pressure over a larger area, and avoiding excessive local pressure on the tab 11 that could cause tearing.

[0029] This application also discloses a battery using the above-described battery assembly, such as... Figure 3 As shown, it includes: Two stacked battery cells, with the tabs 11 of the two battery cells 1 respectively welded to the tab welding portions 23 on both sides of the notch 211; The housing 3 has an opening, and the battery cell 1 is placed inside the housing 3. The cover 4 covers the opening of the housing 3. The cover 4 is provided with a pole post, and the pole post and the pole post connecting part 24 are connected.

[0030] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A battery assembly, characterized in that, include: The battery cell has tabs; The adapter plate includes two plates and a connector. The two plates are connected by the connector and can be folded relative to each other around the connector. At least one plate is provided with a tab welding part. The tab is sandwiched between the two plates and fixed by welding through the tab welding part.

2. The battery assembly as claimed in claim 1, characterized in that, The two sheets are symmetrically arranged about the connector, and the two sheets can be folded relative to the connector so that the two sheets fit together.

3. The battery assembly as described in claim 2, characterized in that, The thickness of the connector is less than or equal to half the thickness of the sheet.

4. The battery assembly as described in claim 2 or 3, characterized in that, When the adapter plate is flattened, the thickness of the plate is less than twice the thickness of the plate, and the distance between the two plates is less than three times the thickness of the plate.

5. The battery assembly as described in claim 2, characterized in that, The sheet body has a notch, and the electrode tab welding portion is located on both sides of the notch.

6. The battery assembly as claimed in claim 2, characterized in that, An insulating pad is provided on the side of the adapter plate facing the battery cell.

7. The battery assembly as claimed in claim 2, characterized in that, At least one of the sheet bodies is provided with a pole post connection portion, which protrudes in a direction perpendicular to the sheet body.

8. The battery assembly as claimed in claim 5, characterized in that, It includes at least two stacked battery cells, with the tabs of two adjacent battery cells respectively welded to the tab welding portions on both sides of the notch.

9. A battery using the battery assembly according to any one of claims 1-8, characterized in that, include: A housing having an opening, the battery cell being placed inside the housing; A cover body that fits over the opening of the housing, the cover body having a pole post that is connected to the adapter plate.

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