Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment, and relates to the technical field of new energy. The battery disclosed by the utility model comprises a shell, a battery cell and a collector plate, wherein an accommodating cavity is defined by the shell; the battery cell is positioned in the accommodating cavity; the current collecting plate is arranged at at least one end of the battery cell, the current collecting plate comprises a first current collecting piece and a second current collecting piece, the first current collecting piece is welded with the battery cell, the second current collecting piece is welded with the shell, and the first current collecting piece and the second current collecting piece are connected into an integrated structure. According to the battery disclosed by the invention, by adopting the design of the current collecting plate with a double-layer structure, the risk of damage to the battery core is reduced on the premise of ensuring firm welding between the second current collecting piece and the shell. Through the structural improvement of the collector plate, the welding difficulty is reduced, the welding yield is improved, the problem of bottom welding of the full-tab cylindrical battery is solved, and the use scene of high-rate charging and discharging of the full-tab battery can be met.

Description

Technical Field

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

[0002] With the increasing demand for high energy density and high-rate charge / discharge performance of lithium batteries from new energy vehicles and energy storage systems, the limitations of traditional single / double tab designs for cylindrical batteries are becoming increasingly apparent. To overcome this bottleneck, all-tab technology has become the focus of the industry. The all-tab design significantly shortens the current transmission path and reduces internal resistance by designating tabs at both ends of the cell, thereby improving battery rate performance and energy efficiency. However, the introduction of all-tab technology places higher demands on welding techniques.

[0003] Each tab needs to be connected to the current collector separately, and the current collector needs to be connected to the casing separately. When welding the current collector to the casing, it is easy to encounter problems such as through welding (excessive penetration depth that breaks through the separator) or incomplete welding (insufficient welding depth), resulting in a low battery yield. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery that, by adopting a double-layer current collector design, reduces the risk of cell damage while ensuring that the second current collector is firmly welded to the casing.

[0005] This utility model also proposes an electrical device having the above-mentioned battery.

[0006] The battery according to a first aspect embodiment of the present invention includes:

[0007] A housing that defines a receiving cavity;

[0008] The battery cell is located in the accommodating cavity;

[0009] A current collector is disposed at at least one end of the battery cell. The current collector includes a first current collector and a second current collector. The first current collector is welded to the battery cell, and the second current collector is welded to the housing. The first current collector and the second current collector are connected as an integral structure.

[0010] The battery according to the embodiments of the present invention has at least the following beneficial effects:

[0011] The battery in this application adopts a double-layer current collector design, which reduces the risk of cell damage while ensuring a firm weld between the second current collector and the casing. The structural improvement of the current collector reduces welding difficulty, increases welding yield, and solves the bottom welding problem of all-tab cylindrical batteries, enabling it to meet the application scenarios of high-rate charge and discharge of all-tab batteries.

[0012] According to some embodiments of the present invention, the first current collector and the second current collector are riveted to form an integral structure;

[0013] Alternatively, the first current collector and the second current collector can be connected by threads to form an integral structure;

[0014] Alternatively, the first current collector and the second current collector can be welded together to form an integral structure.

[0015] According to some embodiments of the present invention, the first current collector and the second current collector are riveted to form an integral structure;

[0016] The current collector includes a riveting component. The first current collector has a first mounting hole, and the second current collector has a second mounting hole that can be aligned with the first mounting hole. The riveting component passes through the first mounting hole and the second mounting hole. The two ends of the riveting component are respectively provided with a first end with an outer diameter larger than the first mounting hole and a second end with an outer diameter larger than the second mounting hole. The first end abuts against the first current collector, and the second end abuts against the second current collector to limit the relative displacement of the first current collector and the second current collector.

[0017] According to some embodiments of the present invention, the first current collector and the second current collector are connected by threads to form an integral structure;

[0018] The collector plate includes a threaded connector and a fixing member with a threaded hole. The first collector has a first mounting hole, and the second collector has a second mounting hole. The threaded connector passes through the first mounting hole and the second mounting hole and is threadedly connected to the fixing member to limit the relative displacement of the first collector and the second collector.

[0019] According to some embodiments of the present invention, the first current collector and the second current collector are connected by threads to form an integral structure;

[0020] The collector plate includes a threaded connector. The first collector has a first mounting hole, and the second collector has a second mounting hole, which is a threaded hole. The threaded connector passes through the first mounting hole and is threadedly connected to the second collector to limit the relative displacement between the first collector and the second collector.

[0021] According to some embodiments of the present invention, the welding area of ​​the first current collector and the battery cell avoids the first mounting hole, and / or, the welding area of ​​the second current collector and the housing avoids the second mounting hole.

[0022] According to some embodiments of the present invention, the end face of the housing and the second current collector are connected as an integral structure by a through-welding process.

[0023] According to some embodiments of the present invention, a first weld mark is formed on the end face, the first weld mark encloses a polygonal region, and the polygonal region is tangent to the edge of the end face.

[0024] According to some embodiments of the present invention, a second weld mark is also formed on the end face, and the second weld mark is disposed in the polygonal region.

[0025] The electrical device according to a second aspect of the present invention includes the battery mentioned in any of the above embodiments.

[0026] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0028] Figure 1 This is a cross-sectional structural diagram of the battery according to an embodiment of the present utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the collector plate (riveting) according to an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the collector plate (threaded connection) according to an embodiment of the present utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the manifold in an embodiment of the present invention (another embodiment of the threaded connection);

[0032] Figure 5 This is a schematic diagram of the structure of the manifold in an embodiment of the present invention (another embodiment of the threaded connection);

[0033] Figure 6 This is a schematic diagram of welding marks on the end face of the shell in an embodiment of the present invention.

[0034] Figure label:

[0035] 100 housing; 110 end face; 111 first weld mark; 112 second weld mark;

[0036] 200 cells;

[0037] Collector plate 300; first collector component 310; first mounting hole 311; first countersunk hole 312; second collector component 320; second mounting hole 321; second countersunk hole 322; riveting component 330; fixing component 340; threaded connector 350; Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.

[0040] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0042] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] With the increasing demand for high energy density and high-rate charge / discharge performance of lithium batteries from new energy vehicles and energy storage systems, the limitations of traditional single / double tab designs for cylindrical batteries are becoming increasingly apparent. To overcome this bottleneck, all-tab technology has become the focus of the industry. The all-tab design significantly shortens the current transmission path and reduces internal resistance by designating tabs at both ends of the cell, thereby improving battery rate performance and energy efficiency. However, the introduction of all-tab technology places higher demands on welding techniques.

[0044] Each tab needs to be connected to the current collector separately, and the current collector needs to be connected to the casing separately. When welding the current collector to the casing, it is easy to encounter problems such as through welding (excessive penetration depth that breaks through the separator) or poor welding (insufficient penetration depth), resulting in a low battery yield.

[0045] In existing technologies, the welding process typically involves first welding the current collector to the battery cell, then assembling the battery cell into the casing, and finally welding the current collector to the casing to secure the battery cell, current collector, and casing. It is important to note that if the welding power is too high during the welding of the current collector to the casing, the weld penetration may penetrate the current collector and damage the battery cell, potentially leading to a short circuit. If the welding power is too low, the connection between the current collector and the casing will be weak, and incompletely fused weld points may detach due to vibration or temperature changes, causing the battery cell to disconnect from the casing and resulting in battery malfunction.

[0046] To address the aforementioned problems, the first aspect of this application proposes a battery, such as... Figure 1 As shown, the battery includes a casing 100, a cell 200, and a current collector 300. The casing 100 is typically made of steel and defines a receiving cavity in which the cell 200 is located. The receiving cavity is also filled with electrolyte so that the cell 200 is immersed in the electrolyte, thereby enabling the cell 200 to undergo an electrochemical reaction with the electrolyte to achieve charging and discharging.

[0047] The function of the current collector is to concentrate and conduct current. Unlike the single-layer current collectors in existing technologies, the current collector 300 of this application adopts a double-layer structure, and the current collector 300 is disposed at at least one end of the battery cell 200. In such a case... Figure 1 In the illustrated embodiment, both ends of the battery cell 200 are connected to current collectors 300. Wherein, as... Figures 2 to 5As shown, the current collector 300 includes a first current collector 310 and a second current collector 320. The first current collector 310 is welded to the battery cell 200, and the second current collector 320 is welded to the housing 100. The first current collector 310 and the second current collector 320 are connected as an integral structure. It should be explained that the integral structure does not mean that the first current collector 310 and the second current collector 320 are formed as a single piece, but rather that the first current collector 310 and the second current collector 320 are connected as a whole through fixing processes such as riveting, threaded connection, and welding. Their relative positions are fixed and cannot move relative to each other.

[0048] Based on the above structure, the battery has the following welding process:

[0049] Step 10: Prepare the first collector 310 and the second collector 320;

[0050] In this state, the first current collector 310 and the second current collector 320 are each independent parts. The structure of the first current collector 310 and the structure of the second current collector 320 can be the same or different.

[0051] Step 20: Weld the first current collector 310 to the battery cell 200;

[0052] Take the first current collector 310 and weld it to the end face 110 of the battery cell 200. Since the thickness of the first current collector 310 is relatively uniform, it is easier to adjust to the required welding power during welding, thereby obtaining a relatively stable welding quality.

[0053] Step 30: Connect the second current collector 320 to the first current collector 310;

[0054] In this step, after the first current collector 310 and the battery cell 200 are welded into an integral structure, the second current collector 320 is connected to the first current collector 310 so that the second current collector 320, the first current collector 310 and the battery cell 200 form an integral structure.

[0055] Step 40: Place the entire assembly into the housing 100;

[0056] Since the first current collector 310, the second current collector 320 and the battery cell 200 form an integrated structure in step 30, the three can be placed as a whole in the housing 100, thus eliminating the need to connect the individual components in the housing 100 and facilitating the assembly operation.

[0057] Step 50: Weld the second current collector 320 and the housing 100.

[0058] It should be noted that during the welding process between the second current collector 320 and the housing 100, the welding parameters can be set to a relatively large value to avoid incomplete welding between the second current collector 320 and the housing 100. Since the current collector 300 has a double-layer structure, even if excessive welding parameters lead to through-welding on the second current collector 320, the first current collector 310 can separate the battery cell 200 and the second current collector 320, thus providing protection and preventing direct contact between the high-temperature molten material and the battery cell 200, thereby reducing the probability of damage to the battery cell 200 due to through-welding.

[0059] In summary, the battery of this application, by adopting a double-layer current collector 300 design, reduces the risk of damage to the cell 200 while ensuring a firm weld between the second current collector 320 and the casing 100. The structural improvement of the current collector 300 reduces welding difficulty, improves welding yield, and solves the bottom welding problem of all-tab cylindrical batteries, thus meeting the application scenarios of high-rate charge and discharge of all-tab batteries.

[0060] It is understood that the double-layer current collector 300 of this application is more suitable for all-tab batteries. Therefore, in the battery assembly process, before step 10, the following steps are also included: first, the electrode sheets of the all-tab are wound into the core of the all-tab, then the tabs at both ends are flattened so that the tabs are almost a flat surface, and then the current collector 300 is welded and the cell 200 is installed into the casing.

[0061] In some embodiments, the first current collector 310 and the second current collector 320 are formed into an integral structure by riveting, or by welding. It is understood that by riveting or welding, the connection between the first current collector 310 and the second current collector 320 is relatively stable, and the connection state can be maintained without destructive damage. In other embodiments, the first current collector 310 and the second current collector 320 are formed into an integral structure by threaded connection. It is understood that threaded connection is a common connection method, with simple connection steps, low requirements for equipment or manual operation skills, and the ability to connect the first current collector 310 and the second current collector 320 at a lower cost.

[0062] Furthermore, such as Figure 2As shown, if the first current collector 310 and the second current collector 320 are riveted together to form an integral structure, the first current collector 310 is provided with a first mounting hole 311, and the second current collector 320 is provided with a second mounting hole 321. It should be noted that the position of the first mounting hole 311 corresponds to the position of the second mounting hole 321, so that after the first current collector 310 and the second current collector 320 are stacked, the first mounting hole 311 and the second mounting hole 321 are aligned and connected. The current collector plate 300 also has a riveting member 330, which passes through the first mounting hole 311 and the second mounting hole 321. It can be understood that the two ends of the riveting member 330 are formed with limiting portions by riveting or other means. The outer diameter of the limiting portion is larger than the outer diameter of the first mounting hole 311 and the second mounting hole 321, so as to restrict the first current collector 310 and the second current collector 320 between the limiting portions at both ends.

[0063] Specifically, for ease of description, the two ends of the riveting member 330 are respectively named the first end and the second end. The first current collector 310 and the second current collector 320 are stacked, and the riveting member 330 passes through the first current collector 310 and the second current collector 320. The outer diameter of the first end is larger than the outer diameter of the first mounting hole 311, and the outer diameter of the second end is larger than the outer diameter of the second mounting hole 321. Furthermore, the first end abuts against the first current collector 310, and the second end abuts against the second current collector 320, so that the first current collector 310 and the second current collector 320 can be clamped between the first end and the second end, preventing relative displacement.

[0064] If the first current collector 310 and the second current collector 320 are connected by threads to form an integral structure, there are multiple implementation methods. For example, in some embodiments, such as Figure 3 As shown, the current collector 300 includes a threaded connector 350 and a fixing member 340 with a threaded hole. The fixing member 340, the first current collector 310, and the second current collector 320 are stacked. The first current collector 310 has a first mounting hole 311, and the second current collector 320 has a second mounting hole 321. The first mounting hole 311, the second mounting hole 321, and the threaded hole are connected. The threaded connector 350 passes through the first mounting hole 311 and the second mounting hole 321 and is connected to the fixing member 340 to limit the relative position of the first current collector 310 and the second current collector 320. Furthermore, if the threaded hole is a through hole penetrating the fixing member 340, the welding area of ​​the first current collector 310 and the battery cell 200 avoids the threaded hole to prevent the welding area from overlapping with the threaded hole and affecting the welding quality.

[0065] Furthermore, such as Figure 4As shown, to prevent the head of the threaded connector 350 from protruding from the first collector 310, the first mounting hole 311 includes a first countersunk portion 312, and the head of the threaded connector 350 is located in the first countersunk portion 312 of the first mounting hole 311. Similarly, to prevent the fastener 340 from protruding from the second collector 320, the second mounting hole 321 includes a second countersunk portion 322 for accommodating the fastener 340.

[0066] In other embodiments, such as Figure 5 As shown, the collector plate 300 includes a threaded connector 350. The first collector 310 is provided with a first mounting hole 311, and the second collector 320 is provided with a second mounting hole 321. The second mounting hole 321 is a threaded hole. The threaded connector 350 passes through the first mounting hole 311 and is threadedly connected to the second collector 320 to limit the relative displacement of the first collector 310 and the second collector 320.

[0067] In the above embodiments, the welding areas of the first current collector 310 and the battery cell 200 avoid the first mounting hole 311, and / or the welding areas of the second current collector 320 and the housing 100 avoid the second mounting hole 321, so as to avoid the welding area coinciding with the hole position and affecting the welding quality.

[0068] In some embodiments, the end face 110 of the housing 100 and the second current collector 320 are connected as an integral structure by a through-welding process.

[0069] Furthermore, such as Figure 6 As shown, a first weld mark 111 is formed on the end face 110 of the housing 100. The first weld encloses a polygonal region, which is tangent to the edge of the end face 110 to maximize the perimeter of the polygon, thereby making the first weld mark 111 the longest, the welding area the largest, and the weld more robust. Figure 6 In the embodiment shown, after the welding head moves around the preset rectangular path, a first weld mark 111 is formed as shown in the figure. The first weld mark 111 encloses a rectangular area. It should be noted that the first weld mark 111 does not fill the rectangular area, but is formed at the edge of the rectangular area. It can be understood that compared with pentagonal and hexagonal welding paths, quadrilateral welding paths are simpler, and the length of the first weld mark 111 is longer, which can meet the requirements of connection strength.

[0070] Furthermore, a second weld mark 112 is formed on the end face 110 of the housing 100. The second weld mark 112 can be as follows: Figure 6 The circle shown can also be a triangle, polygon, etc. It should be noted that the second weld 112 serves a reinforcing function, used to further consolidate the welding effect and prevent poor welding at the bottom of the battery.

[0071] A second aspect of this application provides an electrical device that includes the battery mentioned in any of the above embodiments. The electrical device can be a digital product such as a mobile phone, camera, or tablet; a household appliance such as a mobile robot or portable vacuum cleaner; or a vehicle such as a new energy vehicle. Since this electrical device uses the battery described in the above embodiments, it at least has the beneficial effects mentioned in the above embodiments, which will not be elaborated further here.

[0072] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery, characterized by, The battery comprises: a shell defining a receiving cavity; a battery cell located in the receiving cavity; a current collector plate arranged at at least one end of the battery cell, the current collector plate comprising a first current collector and a second current collector, the first current collector being welded to the battery cell, the second current collector being welded to the shell, and the first current collector and the second current collector being connected as an integrated structure.

2. The battery of claim 1, wherein, The first current collector and the second current collector are connected as an integrated structure by riveting. Alternatively, the first current collector and the second current collector are connected as an integrated structure by screwing. Alternatively, the first current collector and the second current collector are connected as an integrated structure by welding.

3. The battery of claim 2, wherein, The first current collector and the second current collector are connected as an integrated structure by riveting. The current collector plate comprises a rivet, the first current collector is provided with a first mounting hole, the second current collector is provided with a second mounting hole capable of being aligned with the first mounting hole, the rivet is arranged through the first mounting hole and the second mounting hole, two ends of the rivet are respectively provided with a first end with an outer diameter larger than the first mounting hole and a second end with an outer diameter larger than the second mounting hole, the first end abuts against the first current collector, and the second end abuts against the second current collector, so as to limit the relative displacement of the first current collector and the second current collector.

4. The battery of claim 2, wherein, The first current collector and the second current collector are connected as an integrated structure by screwing. The current collector plate comprises a threaded connecting piece and a fixing piece with a threaded hole, the first current collector is provided with a first mounting hole, the second current collector is provided with a second mounting hole, and the threaded connecting piece is arranged through the first mounting hole and the second mounting hole and is threadedly connected with the fixing piece, so as to limit the relative displacement of the first current collector and the second current collector.

5. The battery of claim 2, wherein, The first current collector and the second current collector are connected as an integrated structure by screwing. The current collector plate comprises a threaded connecting piece, the first current collector is provided with a first mounting hole, the second current collector is provided with a second mounting hole, the second mounting hole is a threaded hole, and the threaded connecting piece is arranged through the first mounting hole and is threadedly connected with the second current collector, so as to limit the relative displacement of the first current collector and the second current collector.

6. The battery of claim 5, wherein, The welding region of the first current collector and the battery cell avoids the first mounting hole, and / or the welding region of the second current collector and the shell avoids the second mounting hole.

7. The battery of claim 1, wherein, The end face of the shell and the second current collector are connected as an integrated structure by a penetration welding process.

8. The battery of claim 7, wherein, The end face is formed with a first welding trace, the first welding trace encloses a polygonal region, and the polygonal region is inscribed in the edge of the end face.

9. The battery of claim 8, wherein, The end face is also formed with a second welding trace, and the second welding trace is arranged in the polygonal region.

10. An electrical device, characterized by The battery comprises any one of claims 1 to 9.

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