Insulating spacer and battery

Abstract

The utility model discloses an insulating spacer, which comprises a main body part and a side blocking part, the main body part is provided with a first surface propped against the battery cell and a second surface opposite to the first surface along the thickness direction, and a tab through hole is formed in the main body part in a penetrating manner; the side blocking part is connected with the edge of the main body part, and at least part of the side blocking part extends to the radial side, away from the center of the first surface, of the main body part and the thickness direction side of the second surface. According to the insulating spacer, a side blocking part is additionally arranged on an existing main body part, the side blocking part and the main body part are combined to form an included angle space for containing a bent tab or a bent structure of a tab and electrode connecting piece assembly, and the side blocking part is used for effectively blocking the tab or the bent position of the tab and electrode connecting piece assembly from the shell wall of a shell; the short circuit risk caused by the deviation of the attaching position of the insulating tape is effectively reduced, and the safety coefficient of the battery is improved. The utility model also discloses a battery comprising the insulating spacer.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to an insulating gasket and a battery. Background Art

[0002] The insulating gasket is arranged on the end surface of the battery cell in a flat plate shape, and a through hole for penetrating the pole ear is arranged in the thickness direction. Figure 1 shown.

[0003] In existing multi-electrode batteries, the tabs are bent and connected to the poles, or the tab assembly of the tabs and the electrode connecting sheet is bent and electrically connected to the poles of the top cover, and the bending points of the tabs and the tab assembly are far away from the poles. Taking cylindrical batteries as an example, in order to avoid short circuits caused by overlapping of the negative tabs and the shell wall of the shell, an insulating tape, such as a polyimide tape, must be applied to the surface of the assembly close to the shell wall.

[0004] In actual production, there is a deviation in the attachment position of the insulating tape, which further increases the probability of short circuit between the tab and the shell wall. In the space defined by the battery shell, the radial dimension of the bent structure of the tab and the electrode connecting sheet assembly is too small, which is not conducive to setting more tabs in the battery cell. Utility Model Content

[0005] One of the purposes of the utility model is to overcome the defects in the prior art and provide an insulating gasket, which uses a side stopper to block the bent pole ear or the bent structure of the pole ear and the electrode connecting piece, so as to effectively prevent the bending part of the pole ear or the pole ear assembly from overlapping and short-circuiting with the shell wall.

[0006] In order to achieve the above technical effects, the technical solution of the utility model is: an insulating gasket, comprising:

[0007] The main body has a first surface and a second surface opposite to each other in the thickness direction and a tab through-hole provided therethrough;

[0008] The first surface is configured to abut against the battery core; characterized in that it also includes:

[0009] The side stop is connected to the edge of the main body and at least partially extends to the radial side of the main body away from the center of the first surface and to the side in the thickness direction of the second surface.

[0010] A preferred technical solution is that the main body and the side stop are integrally connected.

[0011] A preferred technical solution is that the fixed end of the side stopper is connected to the main body, and the side stopper has a free end that abuts against the battery top cover and is opposite to the fixed end.

[0012] A preferred technical solution is that the angle between the side stop portion and the main body portion is an obtuse angle.

[0013] A preferred technical solution is that the side baffles are continuously arranged around the circumference of the main body.

[0014] A preferred technical solution is that the number of the side baffles is more than two, and the side baffles are evenly distributed along the circumference of the main body.

[0015] A preferred technical solution is that the side stop portion is in an arcuate shape or a conical shape, and the arcuate side stop portion protrudes away from the central axis of the first surface.

[0016] The second object of the utility model is to provide a battery, comprising the above-mentioned insulating gasket, and also comprising a battery cell with a tab, an insulating gasket abutting against an end surface of the battery cell, and a shell accommodating the battery cell and the insulating gasket;

[0017] The tab is bent; or the tab is connected with the electrode connecting sheet to form a tab assembly, and the tab assembly is bent;

[0018] The side stopper of the insulating gasket is disposed between the bending part of the tab or the tab assembly and the shell.

[0019] A preferred technical solution is that the length direction of the pole ear is projected onto the main body as a first direction, and the size of the main body along the first direction is smaller than the size of the battery cell.

[0020] A preferred technical solution is that the bending part of the tab or the tab assembly has a third surface facing the side stop, and the third surface is fixedly covered with an insulating layer.

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

[0022] The insulating gasket is provided with a side stopper on the existing main body, and the side stopper and the main body are combined to form an angle space for accommodating the bent structure of the tab or the tab and the electrode connecting piece assembly, and the side stopper is used to effectively block the tab or the tab and the electrode connecting piece assembly from the shell wall, thereby effectively reducing the short circuit risk caused by the deviation of the insulating tape attachment position, and improving the safety factor of the battery;

[0023] The side stop is extended from the edge of the main body. Compared with being arranged near the center of the main body, the angle space is larger, and more tabs can be arranged in the battery cell, which is beneficial to improving the battery capacity and meeting the fast charging requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of an insulating gasket in the prior art;

[0025] Figure 2 is a schematic diagram of the three-dimensional structure of the insulating gasket of the embodiment;

[0026] Figure 3 yes Figure 2 Schematic diagram of the top view of the insulating gasket

[0027] Figure 4 Is the insulating gasket along Figure 3 Sectional view of AA in the middle;

[0028] Figure 5 yes Figure 4 A partial enlarged view of B in the middle;

[0029] Figure 6 is a schematic diagram of the three-dimensional structure of an insulating gasket in another embodiment;

[0030] Figure 7 is a schematic diagram of the three-dimensional structure of an insulating gasket in another second embodiment;

[0031] Figure 8 Schematic diagram of the three-dimensional structure of the insulating gasket of another third embodiment;

[0032] Fig. 9 It is a schematic diagram of the assembly structure of the insulating gasket, winding core, pole ear and shell;

[0033] In the figure: 1, insulating gasket; 101, main body; 1011, ear hole; 102, side stop; 102a, fixed end; 102b, free end;

[0034] 2. Battery cell; 201. Tab; 3. Shell; a. First surface; b. Second surface; c. Insulating layer. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] like Figure 1 As shown, the existing insulating gasket 1 is in the shape of a flat plate and is provided with a tab through hole 1011 .

[0040] Example

[0041] like Figure 2-5 As shown, the insulating gasket 1 of the embodiment includes a main body 101 and a side stopper 102; the main body 101 has a first surface a abutting against the battery cell, and a second surface b opposite to the first surface a along the thickness direction, and a tab perforation 1011 is provided through the main body 101 in the thickness direction; the side stopper 102 is connected to the edge of the main body 101, and at least part of the side stopper 102 is extended to the radial side of the main body 101 away from the center of the first surface a and the side of the thickness direction of the second surface b.

[0042] The side block 102 is fixedly connected to the main body 101. The main body 101 is used to block the battery cell and the pole ear, and the side block 102 is used to block the pole ear and the shell. The side block 102 is fixedly connected to the main body 101, including a detachable fixed connection and a non-detachable fixed connection. The detachable fixed connection includes but is not limited to the concave-convex fitting of the side block 102 and the side of the main body 101.

[0043] The insulating gasket 1 can be used for square batteries and round batteries, and the first surface a of the main body 101 is a corresponding rectangle and circle. The tab perforations 1011 are specifically set according to the number and position of the tabs and the width of the tabs. In this embodiment, the insulating gasket 1 is applied to multi-tab cylindrical cells, so the tab perforations 1011 are appropriately larger in radial and circumferential dimensions in the main body 101 and are eccentrically arranged, and the side stop 102 is arranged at the edge of the main body 101 close to or away from the tab perforations 1011.

[0044] The radial side of the main body 101 away from the center of the first surface a and the side in the thickness direction of the second surface b are regarded as the first region. Optionally, the side stop 102 is completely disposed in the first region. For example, Figure 2The tapered side baffle 102; part of the side baffle 102 may be located outside the first region, for example, along the thickness direction of the main body 101, the side baffle 102 is disposed opposite to the main body 101, such as Figure 7 In the embodiment, one end of the side stopper 102 away from the main body is arranged opposite to the main body 101 along the thickness direction of the main body 101 .

[0045] Optionally, the number of the side stopper 102 connected to the main body 101 is one or more than two. Figure 6 The side stopper 102 has a predetermined thickness, and the number of the side stopper 102 directly facing the tab or the tab assembly bending portion along the radial direction of the main body 101 can be one or more than two side stoppers 102 spaced apart from each other.

[0046] In some preferred embodiments, the main body 101 is integrally connected with the side stop 102. Compared with a detachable fixed connection, the insulating gasket 1 connected between the main body 101 and the side stop 102 is more stable and has higher strength. The integrally connected insulating gasket 1 does not increase the number of components in the battery assembly, that is, does not increase the steps of the battery assembly process.

[0047] The main body 101 and the side guard 102 connected in one piece can be produced by known methods such as injection molding, vacuum molding, bonding, welding, etc., and are preferably integrally formed.

[0048] like Figure 5 As shown, in another preferred embodiment, the fixed end 102a of the side stopper 102 is connected to the main body 101, and the side stopper 102 has a free end 102b that abuts against the battery top cover and is opposite to the fixed end 102a.

[0049] Taking the insulating gasket 1 with a circular main body 101 as an example, the side stop 102 corresponds to a predetermined central angle, and the free end 102b of the side stop 102 abuts against the top cover of the battery, so that the insulating gasket 1 is clamped between the battery cell and the top cover, and the battery structure is compact to ensure that the addition of the side stop 102 does not reduce the internal space utilization of the battery shell.

[0050] like Figure 5 As shown, in another preferred embodiment, the angle between the side stopper 102 and the main body 101 is ( Figure 5 When the insulating gasket 1 is inserted into the shell, the main body 101 first enters the shell, and the side stop 102 enters the shell later. The above obtuse angle is conducive to guiding the side stop 102 to enter the shell smoothly. Further, the angle between the side stop 102 and the outer surface of the main body 101 is a folded surface or a smooth transition.

[0051] like Figure 2 , 3As shown, in another preferred embodiment, the side stopper 102 is continuously arranged around the circumference of the main body 101 .

[0052] Compared with the side stop 102 being arranged in a circumferential part of the main body 101, the insulating gasket 1 having the circumferential continuous side stop 102 does not need to consider the orientation of the side stop 102 during installation, that is, it is not necessary to rotate the insulating gasket 1 according to the fixed position of the battery cell tab, or rotate the battery cell according to the fixed position of the side stop 102 of the insulating gasket 1, which is conducive to simplifying the assembly equipment and assembly steps of the insulating gasket 1. In addition, when the end face of the battery cell is arranged horizontally, after the insulating gasket 1 is placed on the end face of the battery cell, the main body 101 is more likely to maintain a horizontal position that is fully in contact with all parts of the battery cell.

[0053] Specifically, the maximum diameter of the circumferentially continuous side stop portion 102 is equal to or slightly smaller than the inner diameter of the housing.

[0054] like Figure 2 , 6 As shown in Figure 8, in another preferred embodiment, the number of the side stoppers 102 is more than two, and the side stoppers 102 are evenly distributed along the circumference of the main body 101. Only the side stoppers 102 that are directly opposite to and adjacent to the bending part of the tab or the tab assembly along the radial direction of the main body 101 play their insulating blocking role; compared with the side stoppers 102 that are continuously arranged around the main body 101, the side stoppers 102 that are spaced apart from each other are conducive to reducing the deadweight of the insulating gasket 1 and the weight of the battery.

[0055] The sizes of the two or more side stoppers 102 may be consistent or inconsistent. When the sizes of the side stoppers 102 are consistent, the force applied by the top cover to each side stopper 102 is evenly distributed; when the end face of the battery cell is set horizontally, after the insulating gasket 1 is placed on the end face of the battery cell, the main body 101 is more likely to maintain a horizontal position that is fully in contact with all parts of the battery cell. On the contrary, when the sizes of the side stoppers 102 are inconsistent, Figure 8 The center of gravity of the insulating gasket 1 having a circular main body 101 does not coincide with the center of the main body. When the outer diameter of the insulating gasket is smaller than the inner diameter of the shell, the insulating gasket is more likely to be deflected in the shell. In order to reduce the weight of the battery, except for the side stopper 102 that plays an insulating blocking role, the central angles of the other side stops 102 can be set to be smaller.

[0056] like Figure 2 , 6 As shown in FIG. 8 , in another preferred embodiment, the side stopper 102 is in an arcuate shape or a conical shape, and the arcuate side stopper is protruded away from the central axis of the first surface a.

[0057] The bent tabs of a multi-tab battery cell or the bent structure of a tab assembly require a larger radial space, and the central axis protrusion facing away from the first surface a is conducive to forming a larger radial space to meet the accommodation requirements of the bent tabs of a multi-tab battery cell or the bent structure of a tab assembly.

[0058] like Figure 2 As shown, the conical side stopper 102 has a minimum radius close to the main body 101, and the end away from the main body 101 has a maximum radius, which can form a larger radial space to meet the accommodation requirements of the bent tabs of multi-tab batteries or the bent structure of the tab assembly.

[0059] It can be understood that, in addition to the tab perforations 1011, the insulating gasket 1 is also provided with one or more of the following structures: a liquid through hole for electrolyte to pass through, and a central through hole for the ultrasonic bottom welding horn to pass through.

[0060] like Fig. 9 As shown, the battery of the embodiment includes the insulating gasket 1 of the above embodiment, and also includes a battery cell 2 with a pole tab 201, the insulating gasket 1 abutting against the end surface of the battery cell 2, and a shell 3 accommodating the battery cell 2 and the insulating gasket 1; the pole tab 201 is bent; or the pole tab is connected with the electrode connecting sheet to form a pole tab assembly, and the pole tab assembly is bent; the side stopper 102 of the insulating gasket 1 is blocked between the pole tab 201 or the bent part of the pole tab assembly and the shell 3.

[0061] The battery can be selected as a single-pole battery or a multi-pole battery.

[0062] like Fig. 9 As shown, in another preferred embodiment, the orthographic projection of the length direction of the tab 201 on the main body 101 is a first direction, and the size of the main body 101 along the first direction is smaller than the size of the battery cell.

[0063] The length direction of the tab 201 refers to the extension direction from the fixed end of the tab connected to the battery cell to the free end, specifically refers to the length direction of the tab in a bent state.

[0064] When the battery cell is a cylindrical battery cell, the first direction is also a radial direction of the end face of the battery cell; when the battery cell is a square battery cell, the first direction is usually the length direction of the short side of the end face of the battery cell.

[0065] like Fig. 9 As shown, in another preferred embodiment, the tab 201 or the bent portion of the tab assembly has a third surface facing the side stop 102 , and the third surface is fixedly covered with an insulating layer c.

[0066] The insulating layer c is connected to the electrode tab or electrode connecting sheet by known methods such as bonding or coating, including but not limited to common polyimide tape.

[0067] The insulating layer c and the side stop 102 form a double insulation structure between the tab 201 or the tab assembly bending part and the inner wall of the shell 3, effectively reducing the probability of overlapping and short-circuiting between the bending part and the inner wall of the shell.

[0068] Understandably, Fig. 9 The opening of the middle shell 3 is provided with a top cover, and the top cover can be optionally abutted against the side stop portion 102 of the insulating gasket 1 .

[0069] 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. An insulating gasket, comprising: The main body has a first surface and a second surface opposite to each other in the thickness direction and a tab through-hole provided therethrough; The first surface is configured to abut against the battery core; characterized in that it also includes: The side stop is connected to the edge of the main body and at least partially extends to the radial side of the main body away from the center of the first surface and to the side in the thickness direction of the second surface.

2. The insulating gasket according to claim 1, characterized in that: The main body is integrally connected with the side stopper.

3. The insulating gasket according to claim 1, characterized in that: The fixed end of the side stopper is connected to the main body, and the side stopper has a free end that abuts against the battery top cover and is opposite to the fixed end.

4. The insulating gasket according to claim 1, characterized in that: The included angle between the side stop portion and the main body portion is an obtuse angle.

5. The insulating gasket according to claim 1, characterized in that: The side stopper is continuously arranged around the circumference of the main body.

6. The insulating gasket according to claim 1 or 3, characterized in that: The number of the side baffles is more than two, and the side baffles are evenly distributed along the circumference of the main body.

7. The insulating gasket according to claim 1, characterized in that: The side stop portion is in an arc shape or a conical shape, and the arc-shaped side stop portion protrudes away from the central axis of the first surface.

8. A battery, characterized in that: The insulating gasket comprises the insulating gasket according to any one of claims 1 to 7, and further comprises a battery cell having a tab, an insulating gasket abutting against an end surface of the battery cell, and a shell accommodating the battery cell and the insulating gasket; The tab is bent; or the tab is connected with the electrode connecting sheet to form a tab assembly, and the tab assembly is bent; The side stopper of the insulating gasket is disposed between the bending part of the tab or the tab assembly and the shell.

9. The battery according to claim 8, characterized in that The length direction of the pole ear is the orthographic projection of the main body as a first direction, and the size of the main body along the first direction is smaller than the size of the battery cell.

10. The battery according to claim 8, characterized in that The bent part of the tab or the tab assembly has a third surface facing the side stop, and the third surface is fixedly covered with an insulating layer.

Images