Battery and power consuming device

Abstract

The application relates to the battery technical field and particularly discloses a battery and a power utilization device, wherein the battery comprises a shell, a battery cell and a cover plate assembly. The shell is provided with an opening, the battery cell is arranged inside the shell and leads out a plurality of tab groups towards the opening, the plurality of tab groups are gathered to form the tab groups; the cover plate assembly comprises a cover plate and a pole assembly, the cover plate seals the opening, the pole assembly is arranged on the cover plate, the pole assembly is electrically connected with the tab groups and forms a first welding area on the tab groups; at least part of the first welding area is provided with a glue layer, the glue layer is suitable for covering the welding slag formed by the first welding area, and the glass transition temperature of the glue layer is less than 0 DEG C. In the application, the glue layer can effectively wrap the welding slag generated in the welding process and prevent the welding slag from falling off. The characteristic that the glass transition temperature of the glue layer is lower than 0 DEG C makes the glue layer stable in the working temperature range of the battery, the glue layer is prevented from being invalid due to temperature rise, and the welding slag is long-term fixed.

Description

Technical Field

[0001] This application relates to the field of battery technology, and specifically discloses a battery and an electrical device. Background Technology

[0002] In battery manufacturing, tabs are typically electrically connected to adapter plates (or terminals) via welding to form an external electrode lead-out structure. However, during welding, due to high energy input and molten metal spatter, weld slag is easily generated in the welding area.

[0003] If these weld slags are not effectively controlled, they can easily detach from the welding area and fall into the battery. Especially between the positive and negative electrodes, they can potentially puncture the separator or directly cause a short circuit, leading to serious safety hazards such as micro-short circuits, thermal runaway, and even fire and explosion. Furthermore, weld slag residue can also affect the cleanliness of subsequent processes and the reliability of the battery, reducing product yield.

[0004] Although existing processes employ measures such as dust extraction, baffles, and inert gas protection to reduce welding slag spatter, these methods cannot completely eliminate the generation and shedding of welding slag. Especially on high-speed automated production lines, welding slag control remains a technical challenge. Utility Model Content

[0005] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions: In a first aspect, this application provides a battery comprising a casing, a cell, and a cover assembly. The casing has an opening, the cell is disposed inside the casing and has multiple tabs extending toward the opening, the multiple tabs being gathered together to form a tab assembly; the cover assembly includes a cover plate and a terminal post assembly, the cover plate sealing the opening, the terminal post assembly being disposed on the cover plate, the terminal post assembly being electrically connected to the tab assembly, and forming a first welding area on the tab assembly; at least a portion of the first welding area is provided with an adhesive layer, the adhesive layer being suitable for coating the welding slag formed in the first welding area, and the glass transition temperature of the adhesive layer being <0°C.

[0006] Secondly, this application also provides an electrical device that includes the battery of the first aspect.

[0007] The technical solution proposed in this application has at least the following technical effects: In the above solution, the adhesive layer effectively encapsulates the weld slag generated during the welding process, preventing it from detaching. The adhesive layer's glass transition temperature, below 0°C, ensures stability within the battery's operating temperature range (typically above 0°C), preventing adhesive layer failure due to temperature increases and thus permanently fixing the weld slag. Specifically, the adhesive layer covers the first welding area formed by welding the tab assembly and the terminal assembly, thereby physically blocking the weld slag and preventing it from piercing the separator and causing a short circuit. This invention is easy to process and is particularly suitable for the immediate fixing of weld slag in high-speed automated production lines. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the battery structure described in some embodiments of this application; Figure 2 This is a schematic diagram of the structure of the battery cell described in some embodiments of this application; Figure 3 This is a partial top view schematic diagram of a portion of the battery structure described in some embodiments of this application; Figure 4 This is a partial cross-sectional schematic diagram of a portion of the battery structure described in some embodiments of this application; Figure 5 for Figure 4 A magnified view of a portion of the image.

[0010] Explanation of reference numerals in the attached figures: 10. Housing; 20. Cell; 201. Electrode assembly; 2011. First welding area; 2012. Second welding area; 2013. Flat end; 30. Cover plate assembly; 301. Cover plate; 302. Terminal assembly; 3021. Adapter piece; 3022. Terminal body; 40. Adhesive layer; X, First direction; Y, Second direction. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0012] The embodiments of this application are described below with reference to the accompanying drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.

[0013] Firstly, combining Figures 1 to 5 Key reference Figures 3 to 5 This application provides an embodiment of a battery comprising a housing 10, a battery cell 20, and a cover assembly 30. The housing 10 has an opening, the battery cell 20 is disposed inside the housing 10 and has multiple tabs extending outward toward the opening, the multiple tabs being gathered together to form a tab assembly 201; the cover assembly 30 includes a cover plate 301 and a terminal post assembly 302, the cover plate 301 sealing the opening, the terminal post assembly 302 being disposed on the cover plate 301, the terminal post assembly 302 being electrically connected to the tab assembly 201, and forming a first welding area 2011 on the tab assembly 201; at least a portion of the first welding area 2011 is provided with an adhesive layer 40, the adhesive layer 40 being adapted to cover the welding slag formed in the first welding area 2011, and the glass transition temperature of the adhesive layer 40 being <0°C.

[0014] In this embodiment, the adhesive layer 40 effectively encapsulates the weld slag generated during the welding process, preventing it from detaching. The adhesive layer 40's glass transition temperature below 0°C ensures its stability within the battery's operating temperature range (typically above 0°C), preventing adhesion failure due to temperature variations and thus permanently fixing the weld slag. Specifically, the adhesive layer 40 covers the first welding area 2011 formed by welding the tab assembly 201 and the terminal assembly 302, thereby physically blocking the weld slag and preventing it from piercing the separator and causing a short circuit. This invention is easy to process and is particularly suitable for the immediate fixing of weld slag in high-speed automated production lines.

[0015] Specifically, the glass transition temperature (Tg) is the characteristic temperature at which a material transitions from a glassy state to a rubbery state, reflecting the critical point of "freezing" and "thawing" of molecular chain segment motion. When the adhesive layer is in the glassy state, the molecular chain segments are frozen, with only atoms vibrating at their equilibrium positions; the material is hard and brittle, losing its adhesiveness. Conversely, when the adhesive layer is in the rubbery state, the chain segments can move freely, and the material exhibits both elasticity and viscosity.

[0016] Optionally, the adhesive layer 40 is made of one or more materials such as polyolefin, polyurethane, polyacrylate, epoxy resin, and phenolic resin. After the electrode post assembly 302 and the electrode tab assembly 201 are welded to form the first welding area 2011, the adhesive layer material is extruded using a gear pump. The material is sprayed from a circular or specially shaped nozzle into the welding area. Furthermore, the adhesive layer 40 is initially gel-like during spraying and then slowly cures.

[0017] In some embodiments, refer to Figure 3Multiple electrodes in the electrode assembly 201 are welded together to form a second welding area 2012, and the first welding area 2011 overlaps at least partially with the second welding area 2012.

[0018] In this embodiment, a dual-integrated structure is formed by at least partial overlap between the internal welding of the tab assembly 201 (second welding area 2012) and the first welding area 2011 (the connection between the tab assembly 201 and the pole post assembly 302). The adhesive layer 40 covers the overlapping area, which can simultaneously fix the weld slag in both places, reducing the risk of weld slag spatter caused by welding stress concentration. In addition, the pre-welding of multiple tabs to form the second welding area 2012 can enhance the mechanical strength of the tab assembly 201 as a whole when welded to the pole post assembly 302, reduce the probability of weld slag peeling caused by local stress, and improve the overall structural reliability.

[0019] In some embodiments, combined with Figures 3 to 5 The adhesive layer 40 covers the entire first welding area 2011.

[0020] In this embodiment, the adhesive layer 40 completely covers the first welding area 2011, eliminating the possibility of weld slag exposure in this area. Furthermore, the complete coverage of the first welding area 2011 by the adhesive layer 40 simplifies the process (eliminating the need for precise positioning of the adhesive layer 40), ensuring comprehensive protection, and is particularly suitable for complex welding scenarios involving multiple tabs.

[0021] In some embodiments, the first welding area 2011 is formed by laser welding.

[0022] In this embodiment, laser welding energy is concentrated, the heat-affected zone is small, the amount of weld slag is small, and the spatter range is controllable. In addition, laser welding can improve welding accuracy, reduce process defects, and work synergistically with adhesive layer 40 to optimize the weld slag control effect.

[0023] In some embodiments, combined with Figures 3 to 5 Along the first direction X, the thickness of the adhesive layer 40 in the first welding area 2011 is d1mm, and satisfies 0.1mm≤d1mm≤2mm.

[0024] In this embodiment, the thickness design of the adhesive layer 40 in the first welding area 2011 needs to balance protection and battery volume efficiency. If it is too thin, it may cause the welding slag to penetrate. If it is too thick, it will increase internal resistance or affect the flexibility of the tabs and increase space occupation, etc.

[0025] Specifically, d1mm can take any one of 0.1mm, 0.5mm, 1mm, 1.5mm and 2mm or a range between any two of these values.

[0026] In some embodiments, refer to Figure 3 The first welding zone 2011 is entirely located inside the second welding zone 2012.

[0027] In this embodiment, the first welding area 2011 is entirely located inside the second welding area 2012, forming a dual integrated structure. The adhesive layer 40 covers the overlapping area, which can fix the two welding slags at the same time, reducing the risk of welding slag spatter caused by welding stress concentration.

[0028] In some embodiments, combined with Figures 3 to 5 The adhesive layer 40 covers the entire second welding area 2012.

[0029] In this embodiment, the adhesive layer 40 completely covers the second welding area 2012, eliminating the possibility of weld slag exposure in this area. Furthermore, the complete coverage of the second welding area 2012 by the adhesive layer 40 simplifies the process (eliminating the need for precise positioning of the adhesive layer 40), ensuring comprehensive protection, and is particularly suitable for complex welding scenarios involving multiple tabs.

[0030] In some embodiments, the second welding zone 2012 is formed by ultrasonic welding.

[0031] In this embodiment, ultrasonic welding can avoid thermal damage to the electrode tab thin layer caused by high temperature, reduce metal molten spatter, achieve high welding precision, and is stable and reliable.

[0032] In some embodiments, combined with Figures 3 to 5 Along the first direction X, the thickness of the adhesive layer 40 in the second welding area 2012 is d2mm, and satisfies 0.05mm≤d2mm≤1.6mm.

[0033] In this embodiment, the thickness design of the adhesive layer 40 in the second welding area 2012 needs to balance protection and battery volume efficiency. If it is too thin, it may cause the welding slag to penetrate; if it is too thick, it will increase internal resistance or affect the flexibility of the tabs and increase space occupation, etc.

[0034] Specifically, d2mm can take any one of the following values: 0.05mm, 0.1mm, 0.5mm, 1mm, 1.5mm, and 1.6mm, or a range between any two of these values.

[0035] It should be noted that the welding heat in the first welding zone 2011 is higher, and more welding slag may be generated than in the second welding zone 2012. Therefore, the thickness of the adhesive layer 40 in the second welding zone 2012 is generally less than the coating thickness in the first welding zone 2011.

[0036] Specifically, refer to Figure 5 In some embodiments, along the first direction X, the thickness of the first welding area 2011 is greater than the thickness of the second welding area 2012.

[0037] In some embodiments not shown in the figures, the first welding area 2011 and the second welding area 2012 have the same thickness along the first direction X, and both have a thickness of 0.1 mm to 2 mm.

[0038] In some embodiments, combined with Figures 3 to 5 The end of the tab assembly 201 away from the cell 20 is cut flush and forms a flat end 2013.

[0039] In this embodiment, the end of the tab assembly 201 is a stress concentration area. It is cut flat to form a flat end 2013 to reduce the generation of burrs and prevent the end of the tab assembly 201 from scratching other components.

[0040] In some embodiments, combined with Figures 3 to 5 The flat end 2013 is provided with an adhesive layer 40.

[0041] In this embodiment, the adhesive layer 40 is disposed at the end of the tab assembly 201, that is, the flat end 2013, which has a good bonding effect and can further suppress the expansion of welding burrs or cracks, and prevent the welding slag from falling off after fracture.

[0042] In some embodiments, combined with Figures 3 to 5 The adhesive layer 40 of the planar end 2013 and the adhesive layer 40 of the first welding area 2011 are integrally formed.

[0043] In this embodiment, the integrated design enhances the stability of the adhesive layer 40, prevents the adhesive layer 40 from falling off, and effectively covers the end of the tab, reducing the risk of structural failure caused by vibration or thermal cycling.

[0044] In some embodiments, combined with Figures 3 to 5 Along the second direction Y, the thickness of the adhesive layer 40 at the planar end 2013 is d3mm, and satisfies 0.1mm≤d3mm≤2mm.

[0045] In this embodiment, the thickness design of the adhesive layer 40 at the planar end 2013 needs to balance protection and battery volume efficiency. Specifically, d3mm can be any one of 0.1mm, 0.5mm, 1mm, 1.5mm and 2mm or within the range of any two of these values.

[0046] In particular, in some embodiments, the first direction X can be the height direction of the battery, and the second direction Y can be the width direction of the battery (the thickness direction of the battery is not shown in the figure). It can be understood that the first direction X and the second direction Y are perpendicular to each other.

[0047] In some embodiments, the adhesive layer 40 is a transparent layer structure.

[0048] In this embodiment, the transparent adhesive layer 40 facilitates visual or optical inspection of welding quality (such as weld integrity and slag distribution), real-time monitoring of production defects, and improvement of yield.

[0049] In some embodiments, combined with Figures 3 to 5The pole assembly 302 includes an adapter piece 3021 and a pole body 3022. The adapter piece 3021 is connected between the tab assembly 201 and the pole body 3022. The adapter piece 3021 is welded to the tab assembly 201 to form a first welding area 2011.

[0050] In this embodiment, a specific implementation of the pole assembly 302 is proposed, which uses an adapter piece 3021 to electrically connect the pole body 3022 and the tab assembly 201 to optimize space utilization.

[0051] In some embodiments, refer to Figure 4 The part where the adapter piece 3021 is welded to the pole body 3022 is provided with an adhesive layer 40.

[0052] In this embodiment, the connection between the adapter piece 3021 and the electrode body 3022 is a key node for current transmission. The adhesive layer 40 can prevent welding slag in this area from causing local short circuits or poor contact, while reducing interface impedance, improving the reliability of the electrode assembly 302, and reducing battery performance degradation caused by connection failure.

[0053] In some embodiments not shown in the figures, the pole assembly 302 includes a pole body 3022, which is welded to the tab assembly 201 to form a first welding area 2011.

[0054] In this embodiment, another specific implementation of the pole assembly 302 is proposed, which can also realize the electrical connection between the pole body 3022 and the tab assembly 201, and is also a desirable implementation.

[0055] Secondly, embodiments of this application provide an electrical device that includes the battery of the first aspect.

[0056] Understandably, the electrical device of the second aspect has all the technical effects of the battery of the first aspect, and its specific technical effects will not be elaborated here.

[0057] It should be noted that the battery and power-consuming device in this embodiment may also include other components, which will not be described in detail here.

[0058] In particular, the term "and / or" in this application should be understood as follows: In the first case, the term “and / or” between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.

[0059] In the second case, the term "and / or" between the last two of three or more subjects means that at least one of the subjects is included. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) first subject and second subject and no third subject; (5) first subject and third subject and no second subject; (6) second subject and third subject and no first subject; and (7) first subject, second subject and third subject; Furthermore, the character " / " in this application indicates that the objects before and after it are in an "or" relationship.

[0060] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A battery, characterized in that, include: The housing (10) has an opening; The battery cell (20) is located inside the housing (10) and has multiple tabs extending out toward the opening. The multiple tabs are gathered together to form a tab group (201). The cover plate assembly (30) includes a cover plate (301) and a pole assembly (302). The cover plate (301) covers the opening. The pole assembly (302) is disposed on the cover plate (301). The pole assembly (302) is electrically connected to the tab assembly (201) and forms a first welding area (2011) on the tab assembly (201). At least a portion of the first welding area (2011) is provided with an adhesive layer (40). The adhesive layer (40) is adapted to cover the welding slag formed in the first welding area (2011). The glass transition temperature of the adhesive layer (40) is <0°C.

2. The battery according to claim 1, characterized in that, Multiple electrodes in the electrode assembly (201) are welded together to form a second welding area (2012), wherein the first welding area (2011) at least partially overlaps with the second welding area (2012).

3. The battery according to claim 1, characterized in that, The adhesive layer (40) covers the entire first welding area (2011).

4. The battery according to claim 1, characterized in that, The first welding zone (2011) is formed by laser welding.

5. The battery according to claim 3, characterized in that, Along the first direction (X), the thickness of the adhesive layer (40) in the first welding area (2011) is d1mm, and satisfies 0.1mm≤d1mm≤2mm.

6. The battery according to claim 2, characterized in that, The first welding area (2011) is entirely located inside the second welding area (2012).

7. The battery according to claim 6, characterized in that, The adhesive layer (40) covers the entire second welding area (2012).

8. The battery according to claim 2, characterized in that, The second welding zone (2012) is formed by ultrasonic welding.

9. The battery according to claim 7, characterized in that, Along the first direction (X), the thickness of the adhesive layer (40) in the second welding area (2012) is d2mm, and satisfies 0.05mm≤d2mm≤1.6mm.

10. The battery according to claim 7, characterized in that, Along the first direction (X), the first welding area (2011) and the second welding area (2012) have the same thickness, and their thicknesses are 0.1mm-2mm.

11. The battery according to claim 1, characterized in that, The end of the tab assembly (201) away from the battery cell (20) is cut flush and forms a flat end (2013).

12. The battery according to claim 11, characterized in that, The planar end (2013) is provided with the adhesive layer (40).

13. The battery according to claim 12, characterized in that, The adhesive layer (40) of the planar end (2013) and the adhesive layer (40) of the first welding area (2011) are integrally formed.

14. The battery according to claim 12, characterized in that, Along the second direction (Y), the thickness of the adhesive layer (40) at the planar end (2013) is d3mm, and satisfies 0.1mm≤d3mm≤2mm.

15. The battery according to any one of claims 1 to 14, characterized in that, The adhesive layer (40) has a transparent layer structure.

16. The battery according to any one of claims 1 to 14, characterized in that, The pole assembly (302) includes an adapter piece (3021) and a pole body (3022). The adapter piece (3021) is connected between the tab assembly (201) and the pole body (3022). The adapter piece (3021) is welded to the tab assembly (201) to form the first welding area (2011).

17. The battery according to claim 16, characterized in that, The portion of the adapter piece (3021) that is welded to the pole body (3022) is provided with the adhesive layer (40).

18. The battery according to any one of claims 1 to 14, characterized in that, The pole assembly (302) includes a pole body (3022), which is welded to the tab assembly (201) to form the first welding area (2011).

19. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1 to 18.

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