Current collecting component, battery and battery pack

Abstract

The utility model relates to the technical field of battery structures, and discloses a current collecting component, a battery and a battery pack, the current collecting component comprises a current collecting component body and a barrier strip, two surfaces oppositely arranged on a first end of the current collecting component body are a first surface and a second surface respectively, the first surface is used for being attached to a first component, and the second surface is provided with at least one welding track area; one part in the welding track area is used for forming a welding mark, and the welding track area extends along with a welding mark track in the welding track area; a barrier strip is arranged on the edge of the welding track area; the production yield of the electrode assembly is improved, and the quality of the electrode assembly is guaranteed.

Description

Technical Field

[0001] This application relates to the field of battery structure technology, specifically to current collectors, batteries, and battery packs. Background Technology

[0002] The current collector is a key component in the battery pack, connecting the tabs and terminals inside the battery. It is generally made of a highly conductive metal material, such as copper, aluminum and their alloys, which has excellent conductivity and can effectively reduce resistance, thereby reducing energy loss and heat generation during battery charging and discharging.

[0003] In related technologies, multiple welding processes are required during battery assembly to achieve battery assembly and shaping. Specifically, the current collector and the electrode are electrically connected by ultrasonic waves, and the current collector is then laser-welded to the terminal on the top cover, thereby realizing the passage from the current collector through the electrode, the current collector and the terminal.

[0004] However, during the laser welding process between the current collector and the electrode post, welding slag is prone to splashing. When the welding slag falls into the electrode assembly, it can puncture the diaphragm in the electrode assembly, causing problems such as short circuit and scrapping of the electrode assembly or excessive self-discharge, which reduces the production yield and affects the battery quality. Utility Model Content

[0005] This application provides a current collector, a battery, and a battery pack to improve the production yield of batteries and ensure battery quality.

[0006] In a first aspect, this application provides a current collecting component, including a current collecting component body and a baffle. Two opposing surfaces on a first end of the current collecting component body are a first surface and a second surface. The first surface is used to fit against an electrode post. At least one welding trajectory area is provided on the second surface. A portion of the welding trajectory area is used to form a weld mark. The welding trajectory area extends along the weld mark trajectory within the welding trajectory area. The baffle is provided along the edge of the welding trajectory area.

[0007] Beneficial effects: By setting a baffle on the edge of the welding trajectory area on the second surface of the current collector body, and extending the welding trajectory area along the weld imprint within it, the baffle can block the welding slag that splashes during the laser welding process between the current collector body and the first component. This keeps the welding slag within the welding trajectory area, preventing it from entering the electrode assembly and piercing the diaphragm, which could lead to short circuits, scrapping, or excessive self-discharge of the electrode assembly. This improves the production yield of the electrode assembly and ensures its quality.

[0008] In one alternative embodiment, at least a portion of the baffle extends in a direction away from the second surface and is inclined toward the welding trajectory region.

[0009] In one alternative embodiment, the projection of the baffle on the second surface is misaligned with the solder mark along a direction perpendicular to the second surface.

[0010] In one optional embodiment, the welding trajectory area is annular, and the stop bar includes an inner stop ring and an outer stop ring. The inner stop ring is disposed at the inner edge of the welding trajectory area, and the outer stop ring is disposed at the outer edge of the welding trajectory area.

[0011] In one alternative embodiment, at least a portion of the inner retaining ring is inclined toward the inside of the welding trajectory region in a direction away from the second surface; and / or, at least a portion of the outer retaining ring is inclined toward the inside of the welding trajectory region in a direction away from the second surface.

[0012] In an alternative embodiment, a protective cover is also included for covering the opening formed by the baffle.

[0013] In one optional embodiment, the stop bar is provided with a plurality of first snap-fit ​​portions on the outer surface of the welding trajectory area; the protective cover is provided with a plurality of second snap-fit ​​portions, and the plurality of first snap-fit ​​portions can be snapped into the plurality of second snap-fit ​​portions one by one, so that the protective cover is connected to the stop bar.

[0014] Secondly, this application also provides a battery, including a battery body and a current collector as described in the first aspect, wherein the battery body is provided with a terminal post; the first surface of the current collector body is welded to the top surface of the terminal post, and a solder mark is provided in the welding trajectory area.

[0015] Beneficial effects: Since the battery includes current collectors, it has the same technical effects as current collectors, which will not be elaborated here.

[0016] In an alternative embodiment, a sealing block is further included, which is disposed within the welding trajectory area and is in contact with the stop bar.

[0017] Thirdly, this application also provides a battery pack including: a plurality of batteries as described in the second aspect.

[0018] Beneficial effects: Since the battery pack includes a battery, it has the same technical effects as the battery, which will not be elaborated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies 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.

[0020] Figure 1 This is an axonometric view of a flow collector according to an embodiment of this application;

[0021] Figure 2 This is an axonometric view of a flow collector component according to an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the first end structure of a current collection component according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the first end structure in another current collection component according to an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of the first end structure in another current collection component according to an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the structure of a battery according to an embodiment of this application;

[0026] Figure 7 for Figure 6 Cross-sectional view at point AA;

[0027] Figure 8 This is a schematic diagram of the structure of a battery according to an embodiment of this application;

[0028] Figure 9 for Figure 8 Cross-sectional view at point BB.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Current collector body; 2. Baffle strip; 3. Weld mark; 4. Protective cover; 5. Battery body;

[0031] 11. First side; 12. Second side; 13. Welding trajectory area;

[0032] 21. Inner retaining ring; 22. Outer retaining ring;

[0033] 51. Top cover assembly; 511. Pole post; 52. Sealing block. Detailed Implementation

[0034] 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.

[0035] In related technologies, multiple welding processes are required during battery assembly to achieve battery assembly and shaping. Specifically, the current collector and the electrode are electrically connected by ultrasonic waves, and the current collector is then laser-welded to the terminal on the top cover, thereby realizing the passage from the current collector through the electrode, the current collector and the terminal.

[0036] However, during the laser welding process between the current collector and the electrode post, welding slag is prone to splashing. When the welding slag falls into the electrode assembly, it can puncture the diaphragm in the electrode assembly, causing problems such as short circuit and scrapping of the electrode assembly or excessive self-discharge, which reduces the production yield and affects the battery quality.

[0037] Therefore, in order to improve the production yield of batteries and ensure battery quality, this application provides a current collector, a battery, and a battery pack.

[0038] The following is combined Figures 1 to 9 This describes an embodiment of the present application.

[0039] According to embodiments of this application, in a first aspect, a current collection component is provided, such as... Figure 1 and Figure 2 As shown, it includes the main body 1 of the flow collection component and the baffle 2, and the specific scheme is as follows.

[0040] The current collector body 1 is a copper sheet, aluminum sheet, or other metal sheet with good conductivity. Two opposing surfaces on the first end of the current collector body 1 are a first surface 11 and a second surface 12, specifically, as shown below. Figure 1 and Figure 2 As shown, the first surface 11 and the second surface 12 are the two large surfaces at the first end of the main body 1 of the current collection component; as Figure 2 As shown, the first surface 11 is used to fit and be attached to the terminal post 511. Specifically, the terminal post 511 can be a component mounted on the top cover of the battery. Of course, the first surface 11 can also be welded to other weldable components; such as... Figure 1 As shown, at least one welding trajectory area 13 is provided on the second surface 12. A portion of the welding trajectory area 13 is used to form a weld mark 3. The welding trajectory area 13 extends along the trajectory of the weld mark 3 within the welding trajectory area 13. A stop bar 2 is provided along the edge of the welding trajectory area 13.

[0041] Specifically, the baffle 2 is made of the same material as the main body 1 of the current collector and is fixed to the second surface 12 by welding. Alternatively, the baffle 2 and the main body 1 of the current collector can be integrally formed. The cross-section of the baffle 2 can be any shape, such as rectangular, square, rhomboid, trapezoidal, etc.

[0042] It should be noted that a stop bar 2 is provided along the edge of the welding trajectory area 13, meaning that the stop bar 2 extends along the edge of the welding trajectory area 13 and connects with the second surface 12.

[0043] It should be noted that the number of welding trajectory areas 13 can be one, or multiple welding trajectory areas 13 can be set according to the connection strength between the current collection component body 1 and the first component.

[0044] In specific usage, such as Figure 6 and Figure 7 As shown, or, Figure 8 and Figure 9 As shown, taking the welding of the current collector and the electrode post 511 of the electrode assembly as an example, the first surface 11 of the current collector body 1 is attached to the top surface of the electrode post 511, and the laser welding head is brought into contact with the welding trajectory area 13 of the second surface 12 on the current collector body 1 to perform laser welding. A weld mark 3 trajectory is formed in the welding trajectory area 13. During the laser welding process, the baffle 2 can block the welding slag that splashes during laser welding, so that the splashed welding slag remains in the welding trajectory area 13.

[0045] In this embodiment, by setting a baffle 2 along the edge of the welding trajectory area 13 on the second surface 12 of the current collector body 1, and extending the welding trajectory area 13 along the trajectory of the weld mark 3 therein, the baffle 2 can block the welding slag that splashes during the laser welding process between the current collector body 1 and the electrode post 511, so that the welding slag remains in the welding trajectory area 13, avoiding the welding slag from entering the motor assembly and piercing the diaphragm, causing the motor assembly to short-circuit and be scrapped or have excessive self-discharge, thereby improving the production yield of the electrode assembly and ensuring the quality of the electrode assembly.

[0046] In one embodiment, such as Figures 3 to 5 As shown, at least a portion of the baffle 2 extends in a direction away from the second surface 12 and is inclined toward the welding trajectory area 13; that is, a portion of the baffle 2 may be inclined toward the welding trajectory area 13, or several portions (i.e. several segments) may be inclined toward the welding trajectory area 13, or the entire baffle 2 may be inclined toward the welding trajectory area 13.

[0047] In a specific embodiment, such as Figures 3 to 5As shown, in the portion of the baffle 2 that is inclined toward the welding trajectory area 13, the angle between the baffle 2 and the second surface 12 along the extension direction away from the second surface 12 is the first angle, which is 60° to 90°. Specifically, the first angle is any one of 60°, 65°, 70°, 75°, 80° and 85°, preferably any one of 60°, 75° and 85°; of course, the first angle can also be selected and set to any other angle according to actual needs.

[0048] It should be noted that the first included angle specifically refers to the angle between the baffle 2 and the second surface 12 in the cross-section at a certain point along the extension trajectory of the baffle 2, in the direction of extension away from the second surface 12. The extension direction of the baffle 2 can be curved, but as long as the angle between the baffle 2 and the second surface 12 at a certain point along its extension trajectory is within the range of 60° to 90°, it is not necessary to keep a fixed angle. For example, the first included angle may be 65° at the first position of the baffle 2 and 85° at the second position of the baffle 2.

[0049] In this embodiment, by extending at least a portion of the baffle 2 in a direction away from the second surface 12 and tilting it into the welding trajectory area 13, the baffle 2 can form a constricted opening, thereby increasing the difficulty of welding slag flying out of the welding trajectory area 13, thereby improving the production yield of the electrode assembly and ensuring the quality of the electrode assembly.

[0050] Meanwhile, by making a first angle between at least a portion of the baffle 2 extending away from the second surface 12 and the second surface 12, with the first angle being 60° to 90°, it is possible to prevent spatter from flying out according to the welding angle requirements, thereby further improving the yield of the electrode assembly and ensuring the quality of the electrode assembly.

[0051] In one embodiment, such as Figure 3 As shown, along the direction perpendicular to the second surface 12, the projection of the baffle 2 on the second surface 12 is offset from the solder mark 3, that is, along the direction perpendicular to the second surface 12, the projection of the baffle 2 on the second surface 12 does not overlap with the solder mark 3; in other words, as... Figure 3 As shown, when viewed from a direction perpendicular to the second surface 12, the baffle 2 and the solder mark 3 do not overlap, or there is a gap between them.

[0052] In this embodiment, by setting the projection of the baffle 2 on the second surface 12 in a direction perpendicular to the second surface 12 to be misaligned with the weld mark 3, interference between the baffle 2 and the weld head can be avoided during the welding process, thereby facilitating welding and improving welding efficiency.

[0053] Conversely, if the projection of the baffle 2 on the second surface 12 is misaligned with the weld mark 3 along a direction perpendicular to the second surface 12, there is a risk of interference between the weld head and the baffle 2 during the welding process, requiring the weld head to be tilted for welding, which will affect the welding efficiency.

[0054] In one embodiment, such as Figure 1 As shown, the welding trajectory area 13 is annular, and the baffle 2 includes an inner baffle 21 and an outer baffle 22. The inner baffle 21 is disposed on the inner edge of the welding trajectory area 13, and the outer baffle 22 is disposed on the outer edge of the welding trajectory area 13.

[0055] Specifically, the welding trajectory area 13 is annular, which can be circular, square, elliptical, or irregularly shaped. For example, part of the welding trajectory area 13 is arc-shaped, another part is curved, and yet another part is straight. Of course, regardless of the shape of the welding trajectory area 13, the extension directions of the inner retaining ring 21 and the outer retaining ring 22 are set to follow the extension direction of the welding trajectory area 13.

[0056] Preferably, the welding trajectory area 13 is annular, and correspondingly, the weld mark 3 within the welding trajectory area 13 is circular or arc-shaped, with the central angle of the arc being greater than 180°.

[0057] In this embodiment, by making the welding trajectory area 13 annular, an inner retaining ring 21 and an outer retaining ring 22 are respectively provided on the inner and outer edges of the welding trajectory area 13, thereby blocking the welding slag that splashes from both sides of the circular or arc-shaped welding mark 3, and preventing the welding slag from flying out from the inner side of the circular or arc-shaped welding mark 3, thus affecting the yield of the electrode assembly.

[0058] In some instances not shown, the welding trajectory area 13 is linear, meaning that the beginning and end of the welding trajectory area 13 are not connected; thus, the baffle 2 surrounds the welding trajectory area 13 in a ring shape.

[0059] Specifically, the term "linear" can refer to a straight line or a curve, or a part of it being straight and another part being curved, etc.

[0060] In one embodiment, such as Figure 5 As shown, at least a portion of the inner retaining ring 21 is inclined inward toward the welding trajectory region 13 in a direction away from the second surface 12; that is, as Figure 5 As shown, the inner retaining rings 21 located in the welding trajectory area 13 are tilted to both sides, which can effectively prevent the welding slag splashed from the inner side from flying out and falling into the electrode assembly.

[0061] And / or, at least a portion of the outer retaining ring 22 is inclined inward toward the welding trajectory region 13 in a direction away from the second surface 12; that is, as Figure 4As shown, the outer retaining rings 22 located in the welding trajectory area 13 are all tilted towards the middle area, which can effectively prevent the welding slag splashed from the outside from flying out and falling into the electrode assembly.

[0062] In this embodiment, by tilting at least a portion of the inner retaining ring 21 and / or at least a portion of the outer retaining ring 22 toward the welding trajectory area 13 in a direction away from the second surface 12, the slag blocking effect on the inner and outer sides during the formation of the annular weld mark 3 can be further improved.

[0063] In one embodiment, such as Figure 6 or Figure 8 As shown, the flow collection component also includes a protective cover 4 for covering the first opening formed by the baffle 2.

[0064] Specifically, the protective cover 4 matches the shape of the welding trajectory area 13; for example, if the welding trajectory area 13 is annular, such as... Figure 6 and Figure 7 As shown, protective cover 4 is a circular cover; and so on. Figure 8 and Figure 9 As shown, the protective cover 4 is ring-shaped.

[0065] In this embodiment, by setting a protective cover 4, after laser welding is completed in the welding trajectory area 13, the protective cover 4 is installed on the opening formed by the baffle 2. This prevents welding slag from falling into the electrode assembly during other operations of the electrode assembly, such as tilting or flipping the electrode assembly, thereby further improving the yield of the electrode assembly.

[0066] In one embodiment, the baffle 2 is provided with a plurality of first snap-fit ​​parts on the outer surface of the welding trajectory area 13; the protective cover 4 is provided with a plurality of second snap-fit ​​parts, and the plurality of first snap-fit ​​parts can be snapped into the plurality of second snap-fit ​​parts one by one, so that the protective cover 4 is connected to the baffle 2.

[0067] Specifically, the first snap-fit ​​part can be a cylinder, which is set at the opening of the inner retaining ring 21 or the outer retaining ring 22. The second snap-fit ​​part is an annular surface on the protective cover 4 that matches the position and shape of the cylinder on the first snap-fit ​​part. The second snap-fit ​​part is fitted onto the first snap-fit ​​part by means of interference fit.

[0068] Alternatively, the first snap-fit ​​part may have a snap-fit ​​block on top, and the second snap-fit ​​part may have a snap-fit ​​groove, which snaps into the snap-fit ​​groove through the elastic deformation of the snap-fit ​​block.

[0069] In this embodiment, multiple first snap-fit ​​parts are provided on the outer surface of the baffle 2 located in the welding trajectory area 13; multiple second snap-fit ​​parts are provided on the protective cover 4, which facilitates the connection between the protective cover 4 and the baffle 2.

[0070] According to embodiments of this application, in a second aspect, such as Figure 6 As shown, a battery is provided, including: a battery body 5 and a current collector component in any embodiment of the first aspect; an electrode post 511 is disposed on the electrode body; the first surface 11 of the current collector component body 1 is bonded to the top surface of the electrode post 511, and a solder mark 3 is disposed in the welding trajectory area 13.

[0071] Specifically, the top cover assembly 51 of the electrode assembly includes a metal plate, a lower plastic and an electrode post 511. The metal plate is fixed on the lower plastic, and the electrode post 511 passes through and is disposed on the lower plastic and the metal plate.

[0072] In this embodiment, since the battery includes a current collector and has the same technical effect as the current collector, it will not be described in detail here.

[0073] In one embodiment, such as Figure 7 and Figure 8 As shown, the battery also includes a sealing block 52, which is disposed within the welding trajectory area 13 and is in contact with the baffle 2.

[0074] Specifically, the sealing block 52 is a sealed block formed by spraying, such as hot melt adhesive, polyolefin and other high molecular polymers.

[0075] In the specific use process, after the current collector is welded to the pole 511, hot melt adhesive is sprayed in the area enclosed by the baffle 2 (i.e., the welding trajectory area 13) with a hot melt gun to cover the welding trajectory area 13 and wrap the weld mark 3. After the hot melt adhesive cools down, it forms a closed block. Then the protective cover 4 is riveted or screwed onto the opening formed by the baffle 2.

[0076] A portion of the baffle 2 is inclined toward the welding trajectory area 13 in a direction away from the second surface 12, which can limit the sealing block 52 and prevent the sealing block 52 from falling off from the area enclosed by the baffle 2.

[0077] In this embodiment, by fusing a sealing block 52 within the welding trajectory area 13, the welding slag within the welding trajectory area 13 after welding can be sealed and retained within the welding trajectory area 13, preventing the welding slag from falling into the electrode assembly when tilting or flipping is required during subsequent processing of the electrode assembly, thereby further improving the yield of the electrode assembly; at the same time, the protective cover 4 can prevent the sealing layer from falling out of the welding trajectory area 13.

[0078] According to an embodiment of this application, a third aspect provides a battery pack including the battery in any one of the embodiments of the second aspect.

[0079] Specifically, battery packs can be used in new energy vehicles (such as cars and drones) or in energy storage devices.

[0080] In this embodiment, since the battery pack includes a battery and has the same technical effects as a battery, it will not be described in detail here.

[0081] According to an embodiment of this application, in a fourth aspect, an electrical device is provided, including the battery pack of the third aspect, or at least one battery of the second aspect.

[0082] Specifically, the electrical equipment can be new energy vehicles (such as cars, drones, etc.) or energy storage equipment.

[0083] In this embodiment, the electrical device includes a battery or battery pack, which has the same technical effects as a battery or battery pack, and will not be described in detail here.

[0084] 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 all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A current collecting member characterized by comprising: The application relates to a current collecting member, which comprises: a current collecting member body (1), two opposite surfaces of a first end of the current collecting member body (1) are respectively a first surface (11) and a second surface (12), the first surface (11) is used for being arranged in close contact with a pole (511), at least one welding track area (13) is arranged on the second surface (12), a part in the welding track area (13) is used for forming a welding mark (3), and the welding track area (13) extends along a track of the welding mark (3) in the welding track area (13); and a baffle strip (2) is arranged at an edge of the welding track area (13).

2. The current collecting member according to claim 1, characterized by At least a part of the baffle strip (2) extends in a direction away from the second surface (12) and is inclined to the inside of the welding track area (13).

3. The current collecting member according to claim 1, characterized by In a direction perpendicular to the second surface (12), a projection of the baffle strip (2) on the second surface (12) is arranged in dislocation with the welding mark (3).

4. The current collecting member according to any one of claims 1 to 3, characterized by The welding track area (13) is annular, the baffle strip (2) comprises an inner baffle ring (21) and an outer baffle ring (22), the inner baffle ring (21) is arranged at an inner ring edge of the welding track area (13), and the outer baffle ring (22) is arranged at an outer ring edge of the welding track area (13).

5. The current collecting member according to claim 4, characterized by At least a part of the inner baffle ring (21) is inclined to the inside of the welding track area (13) in a direction away from the second surface (12). And / or at least a part of the outer baffle ring (22) is inclined to the inside of the welding track area (13) in a direction away from the second surface (12).

6. The current collecting member according to any one of claims 1 to 3, characterized by A protective cover (4) is further arranged for covering an opening surrounded by the baffle strip (2).

7. The current collecting member according to claim 6, characterized by The baffle strip (2) is provided with a plurality of first clamping portions on an outer surface of the welding track area (13); the protective cover (4) is provided with a plurality of second clamping portions, the plurality of first clamping portions can be clamped with the plurality of second clamping portions one by one, so that the protective cover (4) is connected with the baffle strip (2).

8. A battery, characterized by The application relates to a battery, which comprises: a battery body (5) provided with a pole (511); The current collecting member according to any one of claims 1-7, the first surface (11) of the current collecting member body (1) is welded in close contact with a top surface of the pole (511), and the welding mark (3) is formed in the welding track area (13).

9. The battery of claim 8, wherein, A sealing block (52) is further arranged in the welding track area (13), and the sealing block (52) is arranged in contact with the baffle strip (2).

10. A battery pack, characterized by, The application relates to a battery, which comprises: a plurality of batteries according to claims 8 or 9.

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