Lateral liquid injection type stop frame and battery

Abstract

The utility model discloses a lateral liquid injection type stop frame which comprises a main body part and a stop bulge, the main body part is provided with a first surface and a first liquid injection port penetrating through the first surface along a first direction; the stop bulge is arranged on the first surface; the blocking part is arranged on the side of the first direction of the first liquid injection opening in a blocking mode, and a liquid discharging opening communicated with the first liquid injection opening is formed in the side of the second direction of the blocking part; the first direction intersects the second direction. According to the lateral liquid injection type stop frame, the first liquid injection opening and the liquid discharge opening which are communicated in the stop frame meet the liquid injection requirement, and the additionally arranged blocking part can effectively block laser emitted from the liquid injection opening, so that laser cleaning is applied to the liquid injection opening, without a sealing plug and small in size, of a cylindrical battery, and the problem of explosion points in welding of the sealing plug of the cylindrical battery is solved; and the probability that the roll core is burnt by laser due to cleaning of the liquid injection port is effectively reduced, so that the cost loss of scrapping of the battery assembly part is reduced. The utility model discloses a battery comprising a lateral liquid injection type stop frame.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a side liquid injection type stop frame and a battery. Background Art

[0002] The top cover and the stopper of the battery are directly opposite to the injection port. The injection port seal of the square battery top cover includes two parts: a rubber plug and an aluminum sheet. The rubber plug is set in the injection port, and the aluminum sheet covers the plug cover and its periphery of the rubber plug. The edge of the aluminum sheet is welded to the top cover. It is inevitable that there will be electrolyte residue in the welding area around the injection port. If the residue is not cleaned, the probability of explosion points in the welding process will increase significantly.

[0003] Laser cleaning is one of the commonly used methods to remove residual electrolyte from the filling port. The laser cleaning process for square batteries is as follows: a sealing plug is set on the rear cover after filling, and the position of the sealing plug is used as a reference to laser clean the peripheral area of ​​the plug to be welded.

[0004] Due to the limitation of battery size, the sealing plug of the liquid injection port of cylindrical battery is usually an integrated structure. Therefore, laser cleaning is applied to cylindrical battery. During the cleaning process, the liquid injection port of the top cover is open without a sealing plug. The defect is that the cleaning laser passes through the liquid injection port of the top cover and the stop frame, which will cause the winding core to burn, thereby increasing the probability of battery short circuit, etc. Utility Model Content

[0005] One of the purposes of the utility model is to overcome the defects existing in the prior art and provide a side injection type stop frame, which uses the blocking part of the stop frame to block the laser for cleaning the welding area around the injection hole, thereby effectively reducing the probability of battery short circuit caused by laser burns on the winding core.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: a side-injection type stop frame, comprising:

[0007] A main body having a first surface and a first liquid injection port penetrating the first surface along a first direction;

[0008] A stop protrusion is provided on the first surface;

[0009] Also includes:

[0010] A blocking portion is disposed on the first side of the first liquid injection port, and a liquid discharge port connected to the first liquid injection port is disposed on the second side of the first liquid injection port;

[0011] The first direction intersects with the second direction.

[0012] A preferred technical solution is that the blocking portion has a second surface opposite to the first liquid injection port, and the maximum distance between the second surface and the first surface is smaller than the protrusion height of the first surface of the stop protrusion.

[0013] A preferred technical solution is that the blocking portion is connected to the main body portion through a side wall portion, the side wall portion has a first area close to the center of the first surface and a second area away from the center of the first surface, and the drainage port is arranged in the first area and / or the second area.

[0014] A preferred technical solution is that the blocking portion has a second surface opposite to the first liquid injection port, and the liquid discharge port is spaced apart from the second surface along the first direction.

[0015] A preferred technical solution is that the blocking portion is spaced apart from the edge of the first surface; the main body is provided with reinforcing ribs along the edge, the reinforcing ribs are protruded on the first surface, and the blocking portion and the reinforcing ribs are staggered along the circumference of the main body.

[0016] A preferred technical solution is that the first liquid injection port is an edge notch of the main body, the edge notch has a first side edge close to the center of the first surface and a second side edge away from the center of the first surface, and the blocking portion is connected to the first side edge.

[0017] A preferred technical solution is that the first liquid injection port and the stop protrusion are staggered along the circumference of the main body.

[0018] A preferred technical solution is that the blocking portion has a liquid guiding surface which is opposite to the first liquid injection port and is arranged obliquely.

[0019] The second object of the utility model is to provide a battery, comprising a top cover and the above-mentioned lateral liquid injection type stop frame, wherein the top cover is provided with a second liquid injection port, and the second liquid injection port is arranged to be connected with the first liquid injection port.

[0020] A preferred technical solution is that it includes a top cover, the size of the blocking portion is larger than the first liquid injection port; and the second liquid injection port is arranged opposite to the central area of ​​the blocking portion along the first direction.

[0021] The advantages and beneficial effects of the utility model are:

[0022] The first liquid injection port and the liquid discharge port connected in the side liquid injection stopper meet the liquid injection requirements, and the additional blocking part can effectively block the laser injected through the liquid injection port, so that laser cleaning can be applied to the liquid injection port of the cylindrical battery without a sealing plug and with a smaller size, solving the explosion point problem of the cylindrical battery sealing plug welding;

[0023] Effectively reduce the probability of laser burns to the core due to the cleaning of the injection port, thereby reducing the cost loss of scrapped battery assemblies. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1is a schematic diagram of the three-dimensional structure of the side-injection type stop frame of the embodiment;

[0025] Figure 2 is another three-dimensional structural schematic diagram of the side-injection type stop frame of the embodiment;

[0026] Figure 3 is a schematic diagram of the front structural view of the side-injection type stop frame of the embodiment;

[0027] Figure 4 yes Figure 3 A partial enlarged view of middle A;

[0028] Figure 5 It is an exploded view of the assembly structure of the top cover and the side injection type stop frame;

[0029] Figure 6 is a schematic diagram of the three-dimensional structure of a side-injection type stop frame of another embodiment;

[0030] Figure 7 is another three-dimensional structural schematic diagram of a side-injection type stop frame of another embodiment;

[0031] Figure 8 is a three-dimensional structural schematic diagram of an assembly structure of a top cover and a side-injection type stop frame of another embodiment;

[0032] In the figure: 1, main body; 1a, first surface; 101, first liquid filling port; 2, stop protrusion; 3, blocking portion; 3a, second surface; 3b, third surface; 4, liquid discharge port; 5, side wall portion; 501, first area; 502, second area; 6, reinforcing ribs; 7, top cover; 701, second liquid filling port. DETAILED DESCRIPTION

[0033] The following examples are used to further describe the specific implementation of the present invention. The following examples are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0034] In the description of the present application, it should be noted that, unless otherwise specified, “plurality” means more than two; the terms “upper”, “lower”, “left”, “right”, “inside”, “outside”, etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0036] In the description of the present invention, "first", "second" and the like are used to distinguish different objects rather than to describe a specific order or a primary-secondary relationship.

[0037] Example

[0038] like Figure 1-4 As shown in the embodiment, the side-injection type stop frame includes a main body 1 and a stop protrusion 2; the main body 1 has a first surface 1a, a first direction ( Figure 1 The first liquid injection port 101 of the first surface 1a is penetrated in the X direction; the stop protrusion 2 is arranged on the first surface 1a; and the blocking portion 3 is also included. The blocking portion 3 is arranged on the side of the first liquid injection port 101 in the first direction. The second direction ( Figure 2 A liquid discharge port 4 connected to the first liquid injection port 101 is provided on the side (in the middle Y direction); the first direction intersects with the second direction.

[0039] The shape of the main body 1 is adapted to the shape of the battery. The outer contour of the main body 1 of the stopper used for the cylindrical battery depends on the position of the first liquid injection port 101: when the first liquid injection port 101 is spaced from the edge of the first surface 1a, the outer contour of the main body 1 is cylindrical, and the outer contour of the first surface 1a is circular; when the first liquid injection port 101 is notched and arranged at the edge of the first surface 1a, the bottom surface of the cylindrical outer contour of the main body 1 includes but is not limited to a circular segment. The center of the first surface 1a is the center of a circle or a circular segment.

[0040] The function of the stop protrusion 2 is to abut against the battery cell. Specifically, the stop protrusions 2 are evenly distributed around the central axis of the main body 1, and a groove for accommodating the bent pole ear is provided between the stop protrusions 2. In this embodiment, the outer contour of the stop protrusion 2 is a straight column, and the top surface of the planar protrusion of the stop protrusion 2 opposite to the first surface 1a is configured to abut against the end surface of the winding core. The top surface of the protrusion can be optionally an arc plane, so that the abutment area between the stop protrusion 2 and the winding core is set to be larger within a predetermined range, and while dispersing the force on the end surface of the winding core, it is necessary to ensure the smooth flow and mass transfer of the electrolyte at the stop protrusion.

[0041] The blocking portion 3 has two functions: first, the blocking portion 3 blocks the cleaning laser injected through the first liquid injection port 101, and second, provides a liquid discharge port 4 for the electrolyte of the liquid injection liquid to pass through. Optionally, the blocking portion 3 and the main body 1 are detachably fixedly connected, such as plug-in or snap-on, or are non-detachably fixedly connected, such as integrally connected or bonded. Furthermore, the non-detachably fixedly connected, especially the integrally connected, does not increase the number of parts and assembly steps, and the stop frame structure is more stable and reliable.

[0042] Optionally, at least part of the second surface 3a of the blocking portion 3 opposite to the first surface 1a is arranged in the same plane as the top surface of the stop protrusion 2, that is, at least part of the second surface 3a abuts against the winding core.

[0043] like Figure 1 , 6 As shown, in another preferred embodiment, the blocking portion 3 has a second surface 3 a opposite to the first liquid injection port 101 , and the maximum distance between the second surface 3 a and the first surface 1 a is smaller than the protrusion height of the first surface of the stop protrusion 2 .

[0044] In the cylindrical battery to be filled, the first filling port 101 is arranged upward along the plumb direction, the stop protrusion 2 is located below the main body 1, and the top surface of the stop protrusion 2 is lower than the second surface 3a of the blocking portion 3, that is, there is a height gap between the discharge port 4 and the end face of the winding core. The electrolyte is injected from the first filling port 101, and flows out through the discharge port 4 after impacting the blocking portion 3. The height gap between the discharge port 4 and the end face of the winding core allows the electrolyte to fall to the side farther away from the blocking portion 3; the greater the height difference, the greater the proportion of the liquid coverage area on the end face of the winding core.

[0045] The number of liquid injection ports of the existing cylindrical battery top cover and the stop frame are both one, the second surface 3a of the blocking portion 3 in the battery is spaced apart from the winding core in the height direction, and only the stop protrusion 2 in the stop frame abuts against the end face of the winding core to ensure uniform force distribution on the end face of the winding core. In addition, it can further reduce the influence of laser irradiation on the blocking portion 3 and transmit it to the end face of the winding core.

[0046] The drain port 4 can be disposed at any position on the side of the blocking portion 3 in the second direction, including but not limited to: penetrating along the radial direction of the first surface 1a, and penetrating along the tangential direction of the edge of the first surface 1a.

[0047] like Figure 3 , 4 As shown, in another preferred embodiment, the blocking portion 3 is connected to the main body 1 through the side wall portion 5, the side wall portion 5 has a first area 501 close to the center of the first surface 1a and a second area 502 away from the center of the first surface 1a, and the drain port 4 is arranged in the first area 501 and / or the second area 502.

[0048] The electrolyte is discharged through the drainage port 4 of the first area 501, preferentially wetting the central area of ​​the end face of the winding core; the electrolyte is discharged through the drainage port 4 of the second area 502, guided by the side wall of the battery case, preferentially wetting the periphery of the winding core. Figure 3 , 4 In the illustrated embodiment, the drain ports 4 are disposed in the first region 501 and the second region 502 .

[0049] In some embodiments, the side wall portion 5 is disposed around the outer periphery of the blocking portion 3, and the side wall portion 5 has a fixed end connected to the first surface 1a and a free end away from the first surface 1a, and the size from the free end to the fixed end gradually increases, which is conducive to the integral molding and demoulding of the stop frame. Further, the blocking portion 3 and the side wall portion 5 are connected by chamfering or smooth transition.

[0050] like Figure 2 As shown, in another preferred embodiment, the blocking portion 3 has a second surface 3a opposite to the first liquid injection port 101, and the liquid discharge port 4 is spaced apart from the second surface 3a along the first direction.

[0051] When the laser for cleaning the top cover liquid injection port has a predetermined inclination angle, for example, when the cleaning laser has a small angle with the downward direction of the plumb bob, the closer the liquid discharge port 4 is to the second surface 3a, the higher the probability that the laser passes through the liquid discharge port 4.

[0052] The position of the drain port 4 along the first direction can be selected as: close to the first surface 1a and away from the barrier 3, or close to the barrier 3 and away from the first surface 1a, or set in the middle area of ​​the first direction between the first surface 1a and the barrier 3. The barrier 3 has a predetermined thickness, and the second surface 3a of the barrier 3 is opposite to the third surface 3b along the first direction. Preferably, the local orifice edge of the drain port 4 is flush with the third surface 3b to ensure that the electrolyte in the barrier 3 flows smoothly without a dead zone. Further, the thickness of the barrier 3 is appropriately increased to withstand laser irradiation, while ensuring that the drain port 4 has a larger interval with the second surface 3a along the first direction. However, the excessive thickness of the barrier 3 is not conducive to reducing the dead weight of the stop frame and the battery.

[0053] like Figure 2 As shown, in another preferred embodiment, the blocking portion 3 is spaced apart from the edge of the first surface 1a; the main body 1 is provided with reinforcing ribs 6 along the edge, the reinforcing ribs 6 are protruded on the first surface 1a, and the blocking portion 3 and the reinforcing ribs 6 are staggered along the circumference of the main body 1.

[0054] The function of the reinforcing rib 6 is to strengthen the main body 1 and improve the flatness of the main body 1. It can be understood that the protruding height of the reinforcing rib 6 on the first surface 1a is less than the protruding height of the stop protrusion 2, and there is no particular limitation on the relative size of the protruding height of the reinforcing rib 6 and the blocking portion 3. In this embodiment, the protruding height of the reinforcing rib 6 on the first surface 1a is less than the protruding height of the blocking portion 3.

[0055] In this embodiment, the side of the blocking portion 3 away from the center of the first surface 1a is not provided with reinforcing ribs 6. In the liquid injection state, due to the absence of the reinforcing ribs 6, the electrolyte flows more radially along the first surface 1a through the gaps without the reinforcing ribs 6.

[0056] like Figure 6 , 7 As shown, in another preferred embodiment, the first liquid injection port 101 is an edge notch of the main body 1 ( Figure 6 The edge notch has a first side edge close to the center of the first surface 1a and a second side edge away from the center of the first surface 1a, and the blocking portion 3 is connected to the first side edge; the discharge port 4 is located between the edge notch shown by the dotted line and the blocking portion 3. Figure 7 The direction of the arrow in the middle indicates the flow direction of the electrolyte in the injection state.

[0057] Compared with the hole-shaped first liquid injection port 101, the edge notch serves as the first liquid injection port 101, the blocking portion 3 and the main body 1 are connected in a folded surface, and the bent blocking portion forms a liquid discharge port 4, which is conducive to simplifying the structure of the stop frame and the production mold. It can be understood that on the basis of satisfying the arrangement of the stop protrusion 2, the central angle of the edge notch corresponding to the first surface 1a is an obtuse angle, an acute angle or a right angle. In the battery structure, the diameter of the main body of the stop frame is slightly smaller than the inner diameter of the shell, and there is a gap between the edge of the blocking portion and the shell to accommodate the passage of electrolyte.

[0058] In addition, if Figure 6 As shown, the slot body for accommodating the tabs extends radially along the first surface. Compared with the blocking portion of the hole-shaped first liquid injection port 101, the distance between the blocking portion 3 of the edge notch and the center of the first surface 1a is larger, which is conducive to providing a larger radial accommodating space for the tabs or the bending structure of the electrode connecting sheet, and fully avoiding the tabs.

[0059] like Figure 2 , 6 As shown, in another preferred embodiment, the first liquid injection port 101 and the stop protrusion 2 are staggered along the circumference of the main body 1 .

[0060] Similar to the reinforcing rib 6, in the liquid injection state, the electrolyte flows more along the radial direction of the first surface 1a because there is no obstruction of the stop protrusion 2. In addition, since there is no need to avoid the blocking portion 3 in the radial direction of the first surface 1a, the radial dimension of the top surface of the stop protrusion 2 can be appropriately increased to disperse the abutting force of the end surface of the winding core.

[0061] like Figure 6 , 7 As shown, in another preferred embodiment, the blocking portion 3 has a liquid guiding surface which is opposite to and inclined to the first liquid injection port 101. The liquid guiding surface is arranged on the third surface 3b.

[0062] In this embodiment, the third surface 3b is recessed to form a liquid guiding groove for guiding the electrolyte.

[0063] The function of the liquid guide surface is to guide the electrolyte to fall to a predetermined position and / or increase the injection flow rate. The liquid guide surface is inclined relative to the falling direction of the electrolyte at the first injection port 101, and the discharge port 4 is located at a lower position of the liquid guide surface. The inclination angle of the liquid guide surface is specifically determined according to the injection port height and the direction according to the cell infiltration speed.

[0064] like Figure 5 , 8 As shown, the battery of the embodiment includes a top cover 7 and the above-mentioned lateral liquid injection type stop frame, and the top cover 7 is provided with a second liquid injection port 701 , and the second liquid injection port 701 is arranged to be connected with the first liquid injection port 101 .

[0065] The second liquid injection port 701 is usually circular, and the shape of the first liquid injection port 101 is not particularly limited; in the embodiment, the first liquid injection port 101 is a quadrilateral or a circular segment.

[0066] like Figure 5 , 8 As shown, in another preferred embodiment, the size of the blocking portion 3 is larger than the first liquid injection port 101 ; and the second liquid injection port 701 is arranged opposite to the central area of ​​the blocking portion 3 along the first direction.

[0067] Figure 5 The length and width of the first liquid injection port 101 and the blocking portion 3 are both greater than the diameter of the second liquid injection port 701; Figure 8 The size of the blocking portion 3 in the shape of a middle circle is larger than the diameter of the second liquid injection port 701; the above structures are conducive to effectively blocking the cleaning laser with a small angle in the downward direction of the plumb bob, reducing the probability of the cleaning laser passing through the liquid injection hole and damaging the internal structure of the battery.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A side-injection type stop frame, comprising: A main body having a first surface and a first liquid injection port penetrating the first surface along a first direction; A stop protrusion is provided on the first surface; It is characterized by further comprising: A blocking portion is disposed on the first side of the first liquid injection port, and a liquid discharge port connected to the first liquid injection port is disposed on the second side of the first liquid injection port; The first direction intersects with the second direction.

2. The side injection type stop frame according to claim 1, characterized in that: The blocking portion has a second surface opposite to the first liquid injection port, and the maximum distance between the second surface and the first surface is smaller than the protrusion height of the first surface of the stop protrusion.

3. The side injection type stop frame according to claim 1, characterized in that: The blocking portion is connected to the main body portion through a side wall portion, the side wall portion has a first area close to the center of the first surface and a second area away from the center of the first surface, and the liquid discharge port is arranged in the first area and / or the second area.

4. The side injection type stop frame according to claim 1, characterized in that: The blocking portion has a second surface opposite to the first liquid injection port, and the liquid discharge port is spaced apart from the second surface along the first direction.

5. The side injection type stop frame according to claim 1, characterized in that: The blocking portion is spaced apart from the edge of the first surface; the main body is provided with reinforcing ribs along the edge, the reinforcing ribs are protruded on the first surface, and the blocking portion and the reinforcing ribs are staggered along the circumference of the main body.

6. The side injection type stop frame according to claim 1, characterized in that: The first liquid injection port is an edge notch of the main body, the edge notch has a first side edge close to the center of the first surface and a second side edge away from the first surface, and the blocking portion is connected to the first side edge.

7. The side injection type stop frame according to claim 1, characterized in that: The first liquid injection port and the stop protrusion are arranged in a staggered manner along the circumference of the main body.

8. The side injection type stop frame according to claim 1, characterized in that: The blocking portion has a liquid guiding surface which is opposite to the first liquid injection port and is arranged obliquely.

9. A battery, characterized in that: It comprises a top cover and the side liquid injection type stop frame according to any one of claims 1 to 8, wherein the top cover is provided with a second liquid injection port, and the second liquid injection port is arranged to be connected with the first liquid injection port.

10. The battery according to claim 9, characterized in that The size of the blocking portion is larger than the first liquid injection port; and the second liquid injection port is arranged opposite to the central area of ​​the blocking portion along the first direction.

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