Stop frame and power battery

Abstract

The utility model discloses a stop frame. The stop frame comprises a main body part and a stop bulge, the main body part is provided with a first surface and a second surface which are opposite in thickness direction, and the main body part is connected with a pole; the stop bulge is arranged on the first surface, and the stop bulge is configured to abut against the battery cell; accommodating grooves for accommodating the tabs are formed in the stop bulges or between the stop bulges; the locking protrusions and the outer edge of the first surface are arranged at intervals. According to the stop frame, the stop protrusions and the edge of the first surface of the main body part are arranged at intervals, the height of the stop protrusions is larger than that of the main body part, the probability that the main body part and a shell opening rub due to horizontal deviation of the stop frame is effectively reduced, then foreign matter such as stop frame chippings left on the shell opening is reduced, the welding yield is improved, and the welding quality is improved. And the welding explosion point rate, the secondary repair rate and the mass production loss are reduced. The utility model discloses a power battery comprising a stop frame.

Description

Technical Field

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

[0002] In the existing battery structure, the stop frame is a key component to ensure the stability of the battery position. Taking a cylindrical battery as an example, the basic structure of the stop frame includes a main body and a straight columnar stop protrusion. The radial dimension of the main body is set to be larger, which is conducive to reducing the radial swing of the winding core; the outer surface of the stop protrusion includes a protrusion end face and a circumferential side face. The protrusion end face is in contact with the winding core, and the outer edge side wall of the circumferential side face away from the central axis of the main body is an arc surface, and the diameter of the arc surface is equal to the diameter of the main body. The protrusion direction of the stop protrusion is the height direction of the stop frame, and the stop protrusion directly leads to an increase in the height of the stop frame.

[0003] The horizontal deviation of the stop frame during the shell insertion process will intensify the scratches between the outer edge side wall of the stop protrusion and the shell opening, and the probability of tiny stop frame debris and other foreign matter remaining in the shell opening will increase, which will lead to an increase in the top cover welding explosion rate, mass production losses, and a decrease in welding quality rate. Utility Model Content

[0004] One of the purposes of the utility model is to overcome the defects existing in the prior art and provide a stop frame, in which the stop protrusion is spaced apart from the edge of the first surface of the main body, so as to reduce the probability of scratching the shell opening caused by the horizontal deviation of the shell entry stop frame and improve the welding quality of the top cover.

[0005] In order to achieve the above technical effects, the technical solution of the utility model is: a stop frame, comprising:

[0006] A main body portion having a circumferential side surface and a first surface and a second surface opposite to each other in a thickness direction;

[0007] A stop protrusion, disposed on the first surface and configured to abut against the battery cell;

[0008] The stop protrusion or between the stop protrusions is provided with a receiving groove for accommodating the pole lug;

[0009] The stop protrusion is spaced apart from the circumferential side surface.

[0010] A preferred technical solution is that the stop protrusion has an inner cavity, and an opening of the inner cavity is opened on the second surface.

[0011] A preferred technical solution is that the stop protrusion includes a protrusion top wall spaced apart from the first surface, and a protrusion side wall connected between the protrusion top wall and the first surface, and the protrusion top wall and / or the protrusion side wall are provided with a first liquid passage hole.

[0012] A preferred technical solution is that the stop protrusion extends along the first direction and the second direction within the first surface, the extension length of the stop protrusion in the first direction is greater than the extension length in the second direction, and the first liquid passage hole is disposed at opposite ends of the stop protrusion in the first direction.

[0013] A preferred technical solution is that a second liquid passage hole is provided through the main body along the thickness direction, and the second liquid passage hole is provided in communication with the first liquid passage hole along the first direction.

[0014] A preferred technical solution is that the stop protrusion is in an arc shape, and the stop protrusion protrudes away from the central axis of the main body.

[0015] A preferred technical solution is that the arc-shaped stop protrusion is arranged to coincide with the central axis of the main body.

[0016] A preferred technical solution is that the stop protrusions are symmetrically arranged on both sides of the receiving groove.

[0017] A preferred technical solution is that the receiving groove is a through groove with at least one end penetrating therethrough.

[0018] A second object of the present utility model is to provide a power battery, comprising the above-mentioned stop frame.

[0019] The advantages and beneficial effects of the utility model are:

[0020] The stop protrusion in the stop frame is spaced apart from the edge of the first surface of the main body, and the height of the stop protrusion is greater than the height of the main body, which effectively reduces the probability of scratching the main body and the shell opening due to the horizontal deviation of the stop frame, thereby reducing foreign matter such as stop frame debris remaining in the shell opening, which is beneficial to improving the welding quality rate and reducing the welding explosion rate, secondary repair rate and mass production loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of a stop frame in the prior art;

[0022] Figure 2 is a schematic diagram of the three-dimensional structure of the stop frame of the embodiment;

[0023] Figure 3 is a schematic side structural view of a stop frame of an embodiment;

[0024] Figure 4 is another three-dimensional structural schematic diagram of the stop frame of the embodiment;

[0025] Figure 5 is an exploded view of the stop frame and top cover assembly of the embodiment;

[0026] Figure 6is a schematic diagram of the front view of the stop frame and the top cover assembly of the embodiment;

[0027] Figure 7 is a schematic diagram of the three-dimensional structure of a battery in an embodiment;

[0028] In the figure: 1, stop frame; 101, main body; 1011, second liquid hole; 101a, circumferential side; 101b, first surface; 101c, second surface; 102, stop protrusion; 1021, protrusion top wall; 1022, protrusion side wall; 102a, first liquid hole; 103, mounting hole; 104, receiving groove; 2, top cover; 3, shell; 4, pole ear. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Figure 1 The stop frame 1 in the prior art comprises a main body 101 and a stop protrusion 102 .

[0034] Example

[0035] like Figure 2-4 As shown, the stop frame 1 of the embodiment includes a main body 101 and a stop protrusion 102; the main body 101 has a circumferential side surface 101a and a thickness direction ( Figure 2A first surface 101b and a second surface 101c are opposite to each other in the X direction; a stop protrusion 102 is arranged on the first surface 101b, and the stop protrusion 102 is configured to abut against the battery cell; a receiving groove 104 for accommodating the pole ear is arranged on the stop protrusion 102 or between the stop protrusions 102; the stop protrusion 102 is spaced apart from the circumferential side surface 101a.

[0036] The insulating stopper 1 can be used for cylindrical batteries, square batteries or other non-soft-pack batteries with fixed shell structures. The outer edge of the main body 101 abuts against or fits with the inner wall of the battery shell to stabilize the position of the battery cell. Specifically, the orthographic projection of the main body 101 on the battery top cover is consistent with the shell opening. When the stopper 1 is used for cylindrical batteries, the orthographic projection of the main body 101 on the battery top cover is circular.

[0037] The first surface 101b and the second surface 101c are circular planes including but not limited to the circular planes in the present embodiment. It can be understood that a mounting hole 103 is provided at the center of the main body 101, and the stop frame 1 is connected to the pole through the mounting hole 103;

[0038] The stop protrusion 102 is a straight columnar protrusion disposed on the first surface 101b, the protrusion top surface of the stop protrusion 102 is opposite to the first surface 101b along the thickness direction of the main body 101, and the protrusion top surface abuts against the end surface of the cylindrical winding core.

[0039] It is understandable that the stop protrusion 102 is fixedly connected to the main body 101, wherein the detachable fixed connection includes but is not limited to plug-in and snap-on, and the non-detachable fixed connection includes but is not limited to welding, bonding, and integral molding. The integrally connected structural parts have higher strength and structural stability, and fewer assembly steps.

[0040] It can be understood that the pole lug is connected to the pole, and the mounting hole 103 connected to the pole is arranged on the bottom surface of the receiving groove 104 .

[0041] The main body 101 has a predetermined thickness, and the diameter of the first surface 101b is set larger (equal to or slightly smaller than the inner diameter of the shell) with reference to the inner diameter of the shell. In the shell, the outer peripheral edge of the main body 101 abuts against or has a gap fit with the inner wall of the shell to stabilize the radial position of the battery cell.

[0042] On the basis of the larger diameter setting of the first surface 101b, the stop protrusion 102 of the existing stop frame 1 is set at a first radial relative position on the edge of the first surface 101b. When the stop frame 1 is horizontally deflected relative to the first radial direction, the positive projection of the stop protrusion 102 on the battery top cover becomes an ellipse, and the stop protrusions 102 corresponding to the two ends of the long side of the ellipse are more likely to scratch the shell opening and the inner wall, leaving debris and foreign matter at the shell opening, and causing the shell entry to be not smooth; on the contrary, the stop protrusion 102 of the stop frame 1 of the embodiment has a predetermined interval with the edge of the first surface 101b. In addition to reducing the probability of scratching the shell opening and the inner wall, the shell entry process of the stop frame 1 is smoother.

[0043] like Figure 4 As shown, in another preferred embodiment, the stopping protrusion 102 has an inner cavity, and the opening of the inner cavity is opened on the second surface 101c.

[0044] The stop protrusion 102 with an inner cavity has a predetermined strength, can withstand the pressure of the winding core along the axial direction of the winding core, has a smaller dead weight, and is beneficial to reducing the dead weight of the battery.

[0045] like Figure 2 As shown, in another preferred embodiment, the stopping protrusion 102 includes a protrusion side wall 1022 connected between the protrusion top wall 1021 and the first surface 101b, and the protrusion top wall 1021 and / or the protrusion side wall 1022 are provided with a first liquid passage hole 102a.

[0046] The number of the first liquid-passing holes 102 a may be one or more than two, which is determined based on the flow and mass transfer of the electrolyte and the strength of the stop protrusion 102 .

[0047] In this embodiment, each stop protrusion 102 is provided with two first liquid passage holes 102a, one of which is provided on the protrusion top wall 1021, and the other is provided on the protrusion side wall 1022. The electrolyte in the inner cavity of the stop protrusion 102 flows and transfers mass in a predetermined flow direction through the first liquid passage holes 102a, so that the flow of the electrolyte in the battery tends to be uniform.

[0048] like Figure 2 As shown, in another preferred embodiment, the stop protrusion 102 is arranged along the first direction ( Figure 2 Y direction) and the second direction ( Figure 2 The stop protrusion 102 is extended in the first direction (in the middle Z direction), the extension length of the stop protrusion 102 in the first direction is greater than the extension length in the second direction, and the first liquid holes 102a are respectively arranged at two opposite ends of the stop protrusion 102 in the first direction.

[0049] The first direction and the second direction may be selected as a straight line direction or an arc direction. In the figure, the Y direction is the arc direction, and the Z direction is the straight line direction.

[0050] When the number of the first liquid holes 102a is more than two, they are disposed at two opposite ends of the stop protrusion 102 in the first direction, which is beneficial for the electrolyte to fully flow in a predetermined direction and participate in mass transfer.

[0051] In this embodiment, the first direction is the circumference of the central axis of the main body 101, and the second direction is the radial direction of the first surface 101b. The first liquid holes 102a at opposite ends of the first direction are more conducive to reducing the dead zone of electrolyte flow in the inner cavity of the stop protrusion 102.

[0052] like Figure 2 As shown, in another preferred embodiment, a second liquid hole 1011 is provided through the main body 101 in the thickness direction, and the second liquid hole 1011 is provided through the first liquid hole 102a in the first direction. The second liquid hole 1011 and the first liquid hole 102a work together to allow the electrolyte in the inner cavity of the stop protrusion 102 to flow fully. The main body 101 and the stop protrusion 102 connected in one piece are produced by injection molding, and the through structure of the second liquid hole 1011 and the first liquid hole 102a is conducive to optimizing the flow channel of the injection mold of the stop frame 1 and accelerating the filling of the molten material in the mold cavity.

[0053] Furthermore, the protruding top wall 1021 and the protruding side wall 1022 of the stop protrusion 102 are connected by chamfering, so that the molten material can flow smoothly in the mold, be evenly pressurized, and be easily demoulded.

[0054] like Figure 2-4 As shown, in another preferred embodiment, the stop protrusion 102 is in an arc shape, and the stop protrusion 102 protrudes away from the central axis of the main body 101. Accordingly, the protruding top surface of the stop protrusion 102 is an arc plane.

[0055] like Figure 2 As shown, in another preferred embodiment, the arc-shaped stop protrusion 102 is arranged to coincide with the central axis of the main body 101. The top surface of the stop protrusion 102 abuts against the predetermined diameter arc region of the winding core, and the force on the end surface of the winding core tends to be uniform.

[0056] like Figure 2 As shown, in another preferred embodiment, the stop protrusions 102 are symmetrically arranged on both sides of the receiving groove 104, so that the force on the end surface of the winding core is more uniform, thereby improving the stability of the winding core during the use of the battery.

[0057] In some embodiments, the receiving groove 104 is a through groove with at least one end being through. At least one end of the receiving groove 104 is through, and the radial receiving space size is larger, meeting the requirements for receiving bent tabs of multi-tab batteries. More preferably, the receiving groove 104 is a through groove with both ends being through.

[0058] like Figure 5-7As shown, the power battery of the embodiment includes the above-mentioned stop frame 1, and also includes known battery components such as battery cells, top cover 2, and shell 3. The pole lug 4 of the battery cell is bent and arranged in the receiving groove 104 of the stop frame 1 and connected to the pole. The battery cell, the stop frame 1, and the top cover 2 are arranged in sequence along the thickness direction of the main body 101 of the stop frame 1.

[0059] 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 stop frame, comprising: A main body portion having a circumferential side surface and a first surface and a second surface opposite to each other in a thickness direction; A stop protrusion, disposed on the first surface and configured to abut against the battery cell; The stop protrusion or between the stop protrusions is provided with a receiving groove for accommodating the pole lug; The invention is characterized in that the stop protrusion is spaced apart from the circumferential side surface.

2. The stop frame according to claim 1, characterized in that: The stopping protrusion has an inner cavity, and an opening of the inner cavity is opened on the second surface.

3. The stop frame according to claim 2, characterized in that: The stop protrusion includes a protrusion top wall spaced apart from the first surface and a protrusion side wall connected between the protrusion top wall and the first surface. The protrusion top wall and / or the protrusion side wall are provided with a first liquid passage hole.

4. The stop frame according to claim 3, characterized in that: The stop protrusion is extended along the first direction and the second direction in the first surface, the extension length of the stop protrusion in the first direction is greater than the extension length in the second direction, and the first liquid passage holes are arranged at two opposite ends of the stop protrusion in the first direction.

5. The stop frame according to claim 3, characterized in that: A second liquid passage hole is penetrated through the main body along the thickness direction, and the second liquid passage hole is connected to the first liquid passage hole along the first direction.

6. The stop frame according to claim 1, characterized in that: The stop protrusion is in an arc shape, and the stop protrusion is protruded away from the central axis of the main body.

7. The stop frame according to claim 6, characterized in that: The arc-shaped stop protrusion is arranged to coincide with the central axis of the main body.

8. The stop frame according to claim 1, characterized in that: The stop protrusions are symmetrically arranged on both sides of the receiving groove.

9. The stop frame according to claim 1, characterized in that: The receiving groove is a through groove with at least one end penetrating therethrough.

10. A power battery, comprising the stop bracket according to any one of claims 1 to 9.

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