Battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery and a power utilization device, the battery comprises a shell and a battery cell arranged in the shell, the shell is provided with a pole hole, the battery further comprises a current collecting disc, a pole and a sealing assembly, the current collecting disc is arranged in the shell and is connected to the battery cell; the pole column is installed in the pole column hole in a penetrating mode, a groove is formed in the top face of the pole column, the part, corresponding to the bottom face of the groove, of the pole column is a thinned part, and the thinned part is welded to the current collecting plate; the sealing assembly is arranged in the groove in a sealed mode. According to the battery and the electric device provided by the utility model, the problem of liquid leakage can be avoided, and the battery and the electric device have relatively high safety performance.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and an electrical device. Background Technology

[0002] Cylindrical batteries typically include a casing, a core, and a cover assembly. The cover assembly and the casing form an accommodating space, and the core is located within the accommodating space.

[0003] In existing technology, the cover plate assembly includes at least a cover plate, terminals, and a current collector. The cover plate is connected to the housing to form an accommodating space. The terminals are installed through the cover plate, and the current collector is located inside the cover plate. One side of the current collector is connected to the terminal, and the other side is connected to the tab of the winding core. The connection between the current collector and the terminal is usually welding, specifically, laser penetration welding. When using laser penetration welding, the current collector is penetrated from the outside of the terminal to the inside. Because the current collector is thinner than the terminal, which is thicker, welding from the thicker terminal to the thinner current collector can cause cracking of the current collector, leading to leakage of electrolyte from the cylindrical battery through the crack at the weld.

[0004] Therefore, there is an urgent need for a battery and power device to solve the leakage problem. Utility Model Content

[0005] The first objective of this invention is to provide a battery that avoids leakage and has high safety performance.

[0006] The second objective of this invention is to provide an electrical device with high safety.

[0007] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0008] A battery includes a housing and a battery cell disposed within the housing. The housing has terminal holes. The battery also includes:

[0009] A current collector is disposed inside the housing and connected to the battery cell;

[0010] The electrode post is installed through the electrode post hole, and the top surface of the electrode post is provided with a groove. The part of the electrode post corresponding to the bottom surface of the groove is a thinned part, and the thinned part is welded to the current collector.

[0011] A sealing assembly is provided in the groove.

[0012] Optionally, the groove side is provided with a first step structure, and the sealing component overlaps the first step structure; the top surface of the sealing component is flush with the top surface of the pole post, or the top surface of the sealing component is lower than the top surface of the pole post.

[0013] Optionally, the sealing assembly includes a sealing cap and a sealing ring, the sealing cap covering the opening of the groove, and at least a portion of the sealing ring being sealed between the first stepped structure and the sealing cap;

[0014] The circumferential outer wall of the sealing cap is connected to the groove side surface of the groove, the groove side surface is provided with a second step structure, the surface of the sealing cap facing the sealing ring abuts against the step surface of the second step structure, and the circumferential outer wall of the sealing ring abuts against the side wall of the second step structure.

[0015] Optionally, the sealing assembly includes a sealing cap that covers the opening of the groove, the sealing cap having a weak area configured to rupture when the pressure inside the housing exceeds a preset pressure.

[0016] Optionally, the thinning portion is provided with a first through hole, and the current collector includes a current collector body and a bent portion connected to the current collector body; the current collector body is connected to the battery cell, and the bent portion passes through the first through hole and is welded to the bottom surface of the groove.

[0017] Optionally, the thickness of the bent portion is less than the thickness of the thinned portion.

[0018] Optionally, the bottom surface of the groove is provided with a third step structure, the side of the bent portion away from the main body of the collector plate is flush with the step surface of the third step structure, and the bent portion abuts against the side wall of the third step structure.

[0019] Optionally, the cross-sectional area of ​​the first through hole is larger than the cross-sectional area of ​​the bent portion, and the first through hole is a liquid injection hole;

[0020] And / or, the main body of the collector plate is provided with a collector plate hole that communicates with the first through hole;

[0021] And / or, the main body of the collector plate and the bending part are an integral structure.

[0022] Optionally, the thinning portion is provided with a second through hole, and the collector plate includes a collector plate body and a protrusion connected to the collector plate body;

[0023] The current collector body is connected to the battery cell, and the protrusion passes through the second through hole and is welded to the hole wall of the second through hole;

[0024] The surface of the protrusion facing away from the collector plate body is flush with the bottom surface of the groove; or,

[0025] The protrusion is located away from the surface of the collector plate body and is lower than the bottom surface of the groove.

[0026] Electrical devices, including batteries as described above.

[0027] The battery and power-consuming device provided by this utility model have at least the following beneficial effects:

[0028] The terminal post has a thinned section corresponding to the bottom surface of the groove, making the thickness of the thinned section less than the thickness of the terminal post. This reduces the thickness difference between the thinned section and the current collector, lowering the risk of cracking of the current collector when welding from the thinned section to the current collector. This, in turn, prevents electrolyte from leaking out through cracks in the current collector, reducing the risk of battery leakage. A sealing component is sealed inside the groove to block the groove. Even if there are cracks in the current collector, the electrolyte inside the battery will not leak out through cracks and grooves due to the presence of the sealing component. The thinned section, together with the sealing component inside the groove, forms a double sealing structure, providing a double sealing effect, enhancing the sealing effect, reducing the risk of leakage, and improving the safety and reliability of the battery. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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 the content of the embodiments of this utility model and these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the battery structure provided in Embodiment 1 of this utility model;

[0031] Figure 2 This is an exploded view of the battery provided in Embodiment 1 of this utility model;

[0032] Figure 3 This is a cross-sectional view of the battery provided in Embodiment 1 of this utility model;

[0033] Figure 4 This is a utility model Figure 3 The enlarged view at point A is shown below;

[0034] Figure 5 This is a schematic diagram of the pole provided in Embodiment 1 of this utility model;

[0035] Figure 6 This is a schematic diagram of the structure of the collector plate provided in Embodiment 1 of this utility model;

[0036] Figure 7 This is a schematic diagram of the structure of a portion of the battery provided in Embodiment 1 of this utility model, excluding the sealing component;

[0037] Figure 8 This is a schematic diagram of the battery structure provided in Embodiment 2 of this utility model;

[0038] Figure 9 This is an exploded view of the battery provided in Embodiment 2 of this utility model;

[0039] Figure 10 This is a cross-sectional view of the battery provided in Embodiment 2 of this utility model;

[0040] Figure 11 This is a utility model Figure 10 The enlarged view at point B is shown below;

[0041] Figure 12 This is a schematic diagram of the pole structure provided in Embodiment 2 of this utility model;

[0042] Figure 13 This is a schematic diagram of the structure of the collector plate provided in Embodiment 2 of this utility model;

[0043] Figure 14 This is a schematic diagram of the structure of a portion of the battery provided in Embodiment 2 of this utility model, where the sealing component is not shown.

[0044] In the picture:

[0045] 100. Housing; 110. Pole post hole;

[0046] 200. Battery cell;

[0047] 300. Collector plate; 310. Collector plate body; 311. Collector plate hole; 320. Bending part; 321. First bending section; 322. Second bending section; 330. Collector plate body; 340. Protrusion; 341. Welding chamfer;

[0048] 400, pole post; 410, groove; 411, thinning section; 412, first step structure; 413, second step structure; 414, third step structure; 420, first through hole; 430, second through hole;

[0049] 500. Sealing assembly; 510. Sealing cap; 520. Sealing ring;

[0050] 600. Welding groove. Detailed Implementation

[0051] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effects achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0052] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0053] In the description of this utility model, 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 utility model based on the specific circumstances.

[0054] In this utility model, 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. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0055] 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0056] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.

[0057] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0058] Firstly, this embodiment provides a battery that can reduce the risk of cracking of the current collector and avoid leakage, thus having high safety.

[0059] It should be noted that the battery in this embodiment can be a single battery cell, a battery module, or a battery pack; this embodiment does not limit the specific type of battery.

[0060] Example 1

[0061] like Figures 1 to 3 As shown, the battery includes a housing 100, a cell 200, a current collector 300, terminals 400, and a sealing assembly 500. The cell 200 is disposed inside the housing 100, and the housing 100 has a terminal hole 110, through which the terminal 400 is installed.

[0062] For example, the collector plate 300 is disposed within the housing 100 and connected to the battery cell 200. Specifically, the tabs of the battery cell 200 are electrically connected to the collector plate 300 to output and input electrical energy through the collector plate. The terminal post 400 has a top surface and a bottom surface disposed opposite to each other in its thickness direction, the bottom surface of the terminal post 400 being located within the housing 100, and the top surface of the terminal post 400 being exposed outside the housing 100.

[0063] In this embodiment, as Figure 2 As shown, the top surface of the terminal post 400 has a groove 410, the depth direction of which is the same as the thickness direction of the terminal post 400. The portion of the terminal post 400 corresponding to the bottom surface of the groove 410 is a thinned portion 411, that is, the top surface of the thinned portion 411 is the bottom surface of the groove 410. The length of the thinned portion 411 in the thickness direction of the terminal post 400 is less than the length of the terminal post 400 in its own thickness direction. Furthermore, the thinned portion 411 is welded to the current collector 300, such that the thickness of the portion of the terminal post 400 welded to the current collector 300 is less than the thickness of the terminal post 400. The sealing assembly 500 is sealed in the groove 410 and is used to seal the groove 410 to reduce the risk of battery leakage.

[0064] The battery provided in this embodiment has a thinned portion 411 on the terminal post 400. The thinned portion 411 corresponds to the bottom surface of the groove 410, making the thickness of the thinned portion 411 less than the thickness of the terminal post 400. This reduces the thickness difference between the thinned portion 411 and the current collector 300, reducing the risk of cracking of the current collector 300 when welding from the thinned portion 411 to the current collector 300. This prevents electrolyte from leaking out through cracks in the current collector 300, reducing the risk of battery leakage. A sealing component 500 is sealed inside the groove 410 to block the groove 410. Even if there are cracks in the current collector 300, the electrolyte inside the battery will not leak out through cracks and the groove 410 due to the presence of the sealing component 500. The thinned portion 411, together with the sealing component 500 inside the groove 410, forms a double sealing structure, which plays a double sealing role, enhances the sealing effect, reduces the risk of leakage, and improves the safety and reliability of the battery.

[0065] Furthermore, the thinning portion 411 in this embodiment is relatively thin, which reduces the welding energy requirement and welding power when welding the thinning portion 411 to the manifold 300, reduces welding stress, lowers the technical difficulty of welding, and improves welding quality and stability. When the thickness of the thinning portion 411 is less than the thickness of the manifold 300, it is also possible to achieve penetration welding from the thinner thinning portion 411 to the thicker manifold 300, further reducing the welding energy requirement and welding power.

[0066] To facilitate the assembly of the sealing assembly 500, in some optional embodiments, such as Figure 4 and Figure 5 As shown, the groove 410 has a first step structure 412 on its side, and the sealing component 500 overlaps the first step structure 412. This facilitates the positioning and installation of the sealing component 500, improving the assembly efficiency of the sealing component 500 and the pole post 400. Furthermore, the first step structure 412 supports the sealing component 500, preventing the sealing component 500 from being compressed by other structures and affecting the weld strength between the pole post 400 and the collector plate 300. This ensures that the sealing of the sealing component 500 and the welding of the collector plate 300 and the pole post 400 do not affect each other, thus guaranteeing both sealing performance and welding performance between the pole post 400 and the collector plate 300.

[0067] To prevent the sealing assembly 500 from protruding relative to the pole post 400, in this embodiment, as follows: Figure 4 As shown, the top surface of the sealing assembly 500 is flush with the top surface of the terminal post 400. Thus, on the one hand, when the sealing assembly 500 is made of a non-conductive material, its placement does not affect the connection between the terminal post 400 and the busbar; when the sealing assembly 500 is made of a conductive material, both the sealing assembly 500 and the terminal post 400 can connect to the busbar, increasing the contact area with the busbar and ensuring the reliability of the electrical connection. On the other hand, the top of the battery can be relatively flat, and the sealing assembly 500 does not additionally increase the height of the battery, which is beneficial for battery miniaturization and facilitates the assembly of multiple batteries in groups.

[0068] It is understandable that the top surface of the sealing component 500 may not be flush with the top surface of the pole post 400, but rather the top surface of the sealing component 500 may be lower than the top surface of the pole post 400. This can also prevent the sealing component 500 from protruding from the top surface of the pole post 400. This embodiment does not limit this.

[0069] The sealing assembly 500 has various structures; this embodiment provides one such sealing assembly 500. For example... Figure 2 As shown, the sealing assembly 500 includes a sealing cap 510 and a sealing ring 520. Wherein, as... Figure 4As shown, the sealing cap 510 covers the opening of the groove 410 to prevent debris from entering the groove 410. Furthermore, at least a portion of the sealing ring 520 is sandwiched between the first step structure 412 and the sealing cap 510 to seal the gap between the first step structure 412 and the sealing cap 510, thereby achieving a seal on the groove 410.

[0070] Optionally, the size of the sealing cap 510 is usually larger than the size of the sealing ring 520. In order to further improve the sealing performance, the circumferential outer wall of the sealing cap 510 is connected to the groove side of the groove 410, so that a first seal is formed between the sealing cap 510 and the groove side of the groove 410, and a second seal is formed between the sealing ring 520, the first step structure 412 and the sealing cap 510, thereby forming a multi-seal structure and further improving the sealing effect.

[0071] To facilitate the assembly of the sealing cap 510, exemplarily, such as Figure 4 and Figure 5 As shown, the groove 410 has a second step structure 413 on its side. The surface of the sealing cap 510 facing the sealing ring 520 abuts against the step surface of the second step structure 413, providing support and improving the reliability of the connection between the sealing cap 510 and the pole post 400. Furthermore, the circumferential outer wall of the sealing ring 520 abuts against the side wall of the second step structure 413, increasing the contact area between the sealing ring 520 and the pole post 400, thereby increasing the sealing area between them and further improving the sealing performance.

[0072] For example, in this embodiment, a portion of the circumferential side of the sealing ring 520 abuts against the sidewall of the first step structure 412, and another portion abuts against the second step structure 413, so that the sealing ring 520 is limited in the radial direction by the first step structure 412 and the second step structure 413, preventing the sealing ring 520 from moving and improving the stability of the seal.

[0073] To increase the contact area between the terminal 400 and the busbar, the sealing cap 510 in this embodiment is made of a conductive material. Furthermore, the sealing cap 510 is electrically connected to the terminal 400. For example, the sealing cap 510 is welded to the stepped surface of the second stepped structure 413. The sealing cap 510 can also be electrically connected to the busbar, thereby increasing the current-carrying area between the battery and the busbar. Exemplarily, the sealing cap 510 can be made of aluminum, copper, etc., but this embodiment does not limit its material.

[0074] The sealing ring 520 abuts against the side wall of the first step structure 412, and the sealing cover 510 abuts against the side wall of the second step structure. Therefore, when the sealing cover 510 is welded to the pole post 400 through its edge, the effect of the high temperature of welding on the sealing ring 520 can be reduced.

[0075] It is understandable that, in order to improve the sealing performance of the sealing ring 520, the material of the sealing ring 520 is usually a non-metallic material with a certain degree of elasticity, such as silicone or rubber. This embodiment does not limit this.

[0076] The sealing assembly 500 in this embodiment also serves to prevent excessive internal pressure in the battery. Specifically, the sealing cover 510 in this embodiment has a weak area (not shown in the figure), which is configured to rupture when the pressure inside the housing 100 exceeds a preset pressure. Thus, the sealing cover 510 prevents excessive pressure inside the housing 100. For example, when the battery experiences thermal runaway, a large amount of gas is generated inside the battery, increasing the pressure inside the housing 100. When the pressure inside the housing 100 exceeds the preset pressure, the weak area of ​​the battery cover ruptures to release the pressure and prevent dangerous situations such as explosions. In other words, the sealing cover 510 functions similarly to an explosion-proof valve in the prior art. Therefore, the sealing assembly 500 in this embodiment not only has a sealing function but also prevents excessive internal pressure in the battery, offering a more comprehensive range of functions.

[0077] To improve the welding reliability between the thinned portion 411 and the manifold 300, in some optional embodiments, such as Figure 5 As shown, the thinning portion 411 is provided with a first through hole 420. The first through hole 420 extends through the thinning portion 411 along the thickness direction of the pole post 400, that is, the first through hole 420 communicates with the groove 410. Figure 6 As shown, the collector plate 300 includes a collector plate body 310 and a bent portion 320 connected to the collector plate body 310. The collector plate body 310 is connected to the battery cell 200, and the bent portion 320 is used for welding to the thinned portion 411. Specifically, as... Figure 4 and Figure 7 As shown, the bent portion 320 passes through the first through hole 420 and is welded to the bottom surface of the groove 410. The bottom surface of the groove 410 is the top surface of the thinned portion 411, thus enabling the welding of the collector plate 300 and the thinned portion 411.

[0078] By providing a bending portion 320, which passes through the first through hole 420 and bends towards the thinning portion 411, the bending portion 320 can rest on the thinning portion 411 and thus be supported by it. When welding the thinning portion 411 and the bending portion 320, welding proceeds from the bending portion 320 to the thinning portion 411. Therefore, the welding quality and stability are no longer affected by the thickness of the thinning portion 411, but rather by the thickness of the bending portion 320. For example, the thickness of the bending portion 320 is typically less than the thickness of the thinning portion 411. Therefore, through-welding from a thin plate to a thick plate is possible, reducing welding energy requirements and power, decreasing welding stress, lowering the technical difficulty of welding, and improving welding quality and stability. Furthermore, by providing the thinning portion 411, an operating surface is provided for welding the bending portion 320, further reducing the difficulty of welding the bending portion 320 and the thinning portion 411.

[0079] In some optional embodiments, the collector plate 300 is a one-piece structure, that is, the collector plate body 310 and the bending portion 320 are a single unit. In this way, the collector plate 300 can have high structural strength.

[0080] For example, such as Figure 6 As shown, the bending portion 320 includes a first bending section 321 and a second bending section 322. The first bending section 321 is vertically connected to the collector plate body 310, and the second bending section 322 is vertically connected to the first bending section 321. The surface of the second bending section 322 facing the collector plate body 310 is attached to and welded to the bottom surface of the groove 410, which improves the welding reliability of the collector plate 300 and the pole post 400, and also allows the collector plate 300 and the pole post 400 to have a larger connection area and flow area.

[0081] To further reduce the risk of welding cracking, in this embodiment, as follows: Figure 5 As shown, the bottom surface of the groove 410 is provided with a third step structure 414, that is, the top surface of the thinned portion 411 is provided with a third step structure 414. Wherein, as Figure 4As shown, the side of the bent portion 320 facing away from the main body 310 of the collector plate is flush with the step surface of the third step structure 414, that is, the thickness of the bent portion 320 is equal to the height of the third step structure 414. Thus, on the one hand, the bent portion 320 and the thinned portion 411 can be welded by seam welding, which reduces the risk of weld cracking compared to through welding, thereby reducing the risk of leakage; on the other hand, when assembling the bent portion 320, it facilitates the alignment and installation of the bent portion 320 and the pole post 400. For example, by simply ensuring that the side of the bent portion 320 facing away from the main body 310 is flush with the step surface of the third step structure 414, it can be ensured that the side of the bent portion 320 facing the main body 310 fits snugly with the thinned portion 411, thereby ensuring that the bent portion 320 and the pole post 400 have a large contact area.

[0082] To prevent the bent portion 320 from moving radially in the pole post 400, for example, as follows: Figure 4 As shown, the bent portion 320 abuts against the side wall of the third step structure 414. Thus, when welding the bent portion 320 and the thinned portion 411, the end of the bent portion 320 can be welded to the side wall of the third step structure 414 first, so that the bent portion 320 can be more stable and prevent the movement of the bent portion 320 from affecting the welding effect of the bent portion 320 and the thinned portion 411. Then the bent portion 320 and the thinned portion 411 are welded. In addition, the fact that the bent portion 320 abuts against the side wall of the third step structure 414 also facilitates the positioning and installation of the bent portion 320 and the pole post 400.

[0083] In this embodiment, the first through-hole 420 also has a liquid injection function. For details, please refer to [link to documentation]. Figure 4 The cross-sectional area of ​​the first through hole 420 is larger than that of the bent portion 320, so that after the bent portion 320 passes through the first through hole 420, the first through hole 420 still has an area for fluid to flow through. Furthermore, the first through hole 420 is an injection hole, through which electrolyte can be injected into the battery. Therefore, the first through hole 420 can be used not only for the bent portion 320 to pass through but also for injecting electrolyte, making the first through hole 420 more functional. No additional injection hole is needed on the housing 100. Moreover, the sealing assembly 500 sealing groove 410 indirectly seals the injection hole, reducing the risk of leakage.

[0084] It should be noted that when injecting electrolyte into the battery through the first through hole 420, electrolyte can be poured into the groove 410. At this time, the bent part 320 has been welded to the thinned part 411, and the side of the bent part 320 facing away from the current collector body 310 is flush with the step surface of the third step structure 414. The end of the bent part 320 abuts against the side wall of the third step structure 414. There is no gap between the bent part 320 and the third step structure 414, so that the electrolyte will not remain in the groove 410, thus avoiding waste of electrolyte.

[0085] To prevent the collector body 310 from blocking the electrolyte, in this embodiment, as follows: Figure 6 As shown, the collector plate body 310 is provided with a collector plate hole 311 communicating with the first through hole 420. Electrolyte can flow into the battery through the collector plate hole 311. There may be one or more collector plate holes 311, which is not limited in this embodiment.

[0086] For example, a sheet material can be cut and bent upward to form a bend 320, while forming a collector plate hole 311 to facilitate the manufacture of the collector.

[0087] It should be noted that when the battery includes two terminals 400, the thinned portion 411 of the terminal 400 electrically connected to the positive electrode tab of the cell 200 is provided with a first through hole 420 for liquid injection. The cross-sectional area of ​​the first through hole 420 of the other terminal 400 can be equal to the cross-sectional area of ​​the bent portion 320, so as to further reduce the risk of leakage.

[0088] When assembling the battery provided in this embodiment, after the current collector 300 and the cell 200 are welded together, the battery is inserted into the housing 100. At this time, the bent portion 320 of the current collector 300 is perpendicular to the current collector body 310, and the bent portion 320 passes through the first through hole 420. Then, the bent portion 320 is bent in the direction toward the thinned portion 411 so that the surface of the bent portion 320 toward the current collector body 310 contacts the top surface of the thinned portion 411 (i.e., the bottom surface of the groove 410). Next, the bent portion 320 and the thinned portion 411 are welded together through the groove 410 on the terminal post 400 to achieve welding between the current collector 300 and the terminal post 400. Next, a sealing ring 520 is installed so that it does not interfere with the welding between the bent portion 320 and the thinned portion 411. Finally, a sealing cap 510 is welded to the groove 410 opening of the terminal post 400 to obtain the battery.

[0089] The battery provided in this embodiment includes a current collector 300 with a bent portion 320, which is bent and pressed together with the thinned portion 411 of the electrode post 400 before laser welding. This achieves penetration from a thin plate to a thick plate, reducing welding energy requirements and power, decreasing welding stress, lowering welding technical difficulty, and improving welding quality and stability. Furthermore, the double sealing structure of the sealing cap 510 and the sealing ring 520 effectively prevents electrolyte leakage, improving battery safety and reliability. Additionally, by providing a first through hole 420 in the thinned portion 411 of the electrode post 400, both an operating surface for welding the current collector 300 and a liquid injection hole are provided, simplifying the battery structure and reducing processing steps and costs.

[0090] Example 2

[0091] The difference between this embodiment and Embodiment 1 lies in the specific structure of the pole post 400 and the specific structure of the collector plate 300.

[0092] Specifically, such as Figures 8 to 14 As shown, the thinning portion 411 is provided with a second through hole 430, and the current collector 300 includes a current collector body 330 and a protrusion 340 connected to the current collector body 330. The current collector body 330 is connected to the battery cell 200, and the protrusion 340 passes through the second through hole 430 and is welded to the hole wall of the second through hole 430 to achieve welding between the protrusion 340 and the thinning portion 411, thereby enabling welding between the electrode post 400 and the current collector 300.

[0093] In this embodiment, the shape of the protrusion 340 is the same as that of the second through hole 430, and the dimensions of the protrusion 340 are tolerant to the diameter of the second through hole 430, so that the outer circumferential surface of the protrusion 340 can be closely fitted and welded to the hole wall of the second through hole 430, thus having a larger welding area. In this embodiment, the protrusion 340 is cylindrical, and the second through hole 430 is a circular hole. For example, the diameter of the second through hole 430 ranges from 5mm to 25mm. If the second through hole 430 is too large, it will affect the structural strength of the pole post 400; if the second through hole 430 is too small, it will reduce the welding area between the pole post 400 and the collector plate 300. For example, the diameter of the second through hole 430 is 5mm, 10mm, 15mm, 20mm, 25mm, etc. It should be noted that, in order to reduce the weight of the collector plate 300, the protrusion 340 in this embodiment is a hollow structure, for example, the protrusion 340 can be formed by stamping. It is understandable that the protrusion 340 can also be a solid structure, and this embodiment does not limit this.

[0094] In some optional embodiments, the protrusion 340 and the wall of the second through hole 430 are welded by seam welding, with the welding path circling the protrusion 340. Therefore, it can also be considered that the protrusion 340 and the wall of the second through hole 430 are welded by peripheral welding, which can form a sealing structure. Furthermore, compared with through welding, there is no situation of thick plate through thin plate, so the welding energy requirement is lower, the welding power is lower, the welding stress is relatively lower, and the risk of welding cracking is lower.

[0095] For example, such as Figure 13 As shown, the end of the protrusion 340 facing away from the collector plate body 330 is provided with a welding chamfer 341. When the protrusion passes through the second through hole 430, the welding chamfer 341 can form a welding groove 600 between itself and the hole wall of the second through hole 430, so as to accommodate the solder and thus improve the welding strength and reliability between the thinned part 411 and the protrusion 340. Of course, it can be understood that the opening of the second through hole 430 can also be provided with a chamfer that matches the welding chamfer, so that the welding groove 600 can be larger to accommodate more solder.

[0096] In some optional embodiments, the surface of the protrusion 340 facing away from the collector plate body 330 is flush with the bottom surface of the groove 410. This facilitates welding when the protrusion 340 and the wall of the second through hole 430 are seam welded, reducing the difficulty of welding operations and ensuring weld quality.

[0097] It is understood that the surface of the protrusion 340 away from the collector plate body 330 may not be flush with the bottom surface of the groove 410, but rather the surface of the protrusion 340 away from the collector plate body 330 may be lower than the bottom surface of the groove 410. This embodiment limits this.

[0098] When assembling the battery provided in this embodiment, after the current collector 300 and the cell 200 are welded together, the battery is inserted into the housing 100, and the protrusion 340 is inserted into the second through hole 430. Then, the protrusion 340 is welded to the wall of the second through hole 430 through the groove 410 on the terminal post 400 to achieve welding between the current collector 300 and the terminal post 400. Next, a sealing ring 520 is installed so that it does not interfere with the welding between the protrusion 340 and the thinned portion 411. Finally, a sealing cap 510 is welded to the groove 410 of the terminal post 400 to obtain the battery.

[0099] Secondly, this embodiment provides an electrical device, including the battery as described in the first aspect. The electrical device provided in this embodiment...

[0100] For example, electrical devices include, but are not limited to: mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0101] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery, comprising a housing (100) and a battery cell (200) disposed within the housing (100), wherein the housing (100) is provided with terminal holes (110), characterized in that, The battery also includes: A collector plate (300) is disposed inside the housing (100) and connected to the battery cell (200); A pole post (400) is installed through the pole post hole (110). The top surface of the pole post (400) is provided with a groove (410). The part of the pole post (400) corresponding to the bottom surface of the groove (410) is a thinned part (411). The thinned part (411) is welded to the collector plate (300). A sealing assembly (500) is provided in the groove (410).

2. The battery according to claim 1, characterized in that, The groove (410) has a first step structure (412) on its side, and the sealing component (500) overlaps the first step structure (412); the top surface of the sealing component (500) is flush with the top surface of the pole post (400), or the top surface of the sealing component (500) is lower than the top surface of the pole post (400).

3. The battery according to claim 2, characterized in that, The sealing assembly (500) includes a sealing cap (510) and a sealing ring (520), the sealing cap (510) covering the opening of the groove (410), and at least part of the sealing ring (520) being sealed between the first stepped structure (412) and the sealing cap (510). The circumferential outer wall of the sealing cap (510) is connected to the groove side of the groove (410). The groove side of the groove (410) is provided with a second step structure (413). The surface of the sealing cap (510) facing the sealing ring (520) abuts against the step surface of the second step structure (413). The circumferential outer wall of the sealing ring (520) abuts against the side wall of the second step structure (413).

4. The battery according to claim 1, characterized in that, The sealing assembly (500) includes a sealing cap (510) that covers the opening of the groove (410), and the sealing cap (510) is provided with a weak area that is configured to rupture when the pressure inside the housing (100) is greater than a preset pressure.

5. The battery according to any one of claims 1-4, characterized in that, The thinning portion (411) is provided with a first through hole (420). The current collector (300) includes a current collector body (310) and a bent portion (320) connected to the current collector body (310). The current collector body (310) is connected to the battery cell (200). The bent portion (320) passes through the first through hole (420) and is welded to the bottom surface of the groove (410).

6. The battery according to claim 5, characterized in that, The thickness of the bent portion (320) is less than the thickness of the thinned portion (411).

7. The battery according to claim 5, characterized in that, The bottom surface of the groove (410) is provided with a third step structure (414). The side of the bent part (320) away from the main body (310) of the collecting plate is flush with the step surface of the third step structure (414), and the bent part (320) abuts against the side wall of the third step structure (414).

8. The battery according to claim 5, characterized in that, The cross-sectional area of ​​the first through hole (420) is larger than the cross-sectional area of ​​the bent portion (320), and the first through hole (420) is a liquid injection hole; And / or, the main body of the collector plate (310) is provided with a collector plate hole (311) communicating with the first through hole (420); And / or, the main body of the collector plate (310) and the bending part (320) are an integral structure.

9. The battery according to any one of claims 1-4, characterized in that, The thinning portion (411) is provided with a second through hole (430), and the collector plate (300) includes a collector plate body (330) and a protrusion (340) connected to the collector plate body (330); The current collector body (330) is connected to the battery cell (200), and the protrusion (340) passes through the second through hole (430) and is welded to the hole wall of the second through hole (430); The surface of the protrusion (340) facing away from the collector plate body (330) is flush with the bottom surface of the groove (410); or, The surface of the protrusion (340) facing away from the collector plate body (330) is lower than the bottom surface of the groove (410).

10. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 1-9.

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