Electrode assembly insulator and battery

Abstract

The utility model relates to the field of batteries, and discloses an electrode assembly insulating part and a battery. The electrode assembly insulating part comprises a box body structure, wherein the top of the box body structure is provided with an opening for an electrode assembly to pass through; the sealing cover structure covers the opening, the sealing cover structure is provided with a receding hole formed in a penetrating mode, the two side edges, extending in the first direction, of the sealing cover structure are each provided with a first connecting structure, the first connecting structures extend towards the box body structure, and the first connecting structures are connected with the box body structure. The box body structure can wrap the electrode assembly from bottom to top, and the sealing cover structure can cover the top surface of the electrode assembly from top to bottom, so that the electrode assembly can be wrapped, and the insulating property of the electrode assembly is improved. And the first connecting structure can partially coincide with the box body structure, so that the extension distance of the first connecting structure is slightly influenced by the height space of the battery, the connecting area between the first connecting structure and the box body structure is larger, and the connecting strength between the first connecting structure and the box body structure can be further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an electrode assembly insulating member and a battery. Background Art

[0002] A battery typically includes a casing, a cover plate, and an electrode assembly. The electrode assembly is disposed inside the casing, and the cover plate and the casing form a closed structure. An electrode assembly insulator is disposed between the electrode assembly and the casing to prevent short circuits between the electrode assembly and the casing. A first insulating sheet (also known as lower plastic) is disposed on the inner side of the cover plate. The electrode assembly insulator is configured as a cover structure with an open top. The electrode assembly insulator is fitted from the bottom of the electrode assembly onto the outside of the electrode assembly. To secure the electrode assembly insulator, the top of the electrode assembly insulator is heat-melted to the first insulating sheet.

[0003] Due to the limitation of the installation space in the height direction inside the battery, the thickness of the first insulating sheet is usually small, so the connection area between the first insulating sheet and the electrode assembly insulating part is small, which makes the connection between the electrode assembly insulating part and the first insulating sheet prone to loosening. The electrode assembly insulating part is prone to deformation or movement due to loss of fixation, resulting in the electrode assembly insulating part being unable to effectively isolate the electrode assembly and the outer shell, increasing the risk of insulation failure between the electrode assembly and the outer shell, and posing a safety hazard. Utility Model Content

[0004] In view of this, the present invention provides an electrode assembly insulating member, a battery, and a battery pack to solve or improve the problem that the connection between the electrode assembly insulating member and the first insulating sheet is easily loosened.

[0005] In a first aspect, the present invention provides an electrode assembly insulating member, comprising:

[0006] A box structure, wherein the top of the box structure is provided with an opening for the electrode assembly to pass through;

[0007] A covering structure, wherein the covering structure covers the opening, the covering structure has an avoidance hole arranged through it, and both sides of the covering structure extending along the first direction are provided with a first connecting structure, the first connecting structures both extend toward the box body structure, and the first connecting structures are both connected to the box body structure.

[0008] In an optional embodiment, both sides of the covering structure extending along the second direction are provided with second connecting structures, the second connecting structures extend toward the box body structure, the second connecting structures are connected to the box body structure, and the second direction intersects with the first direction.

[0009] In an optional embodiment, the first connecting structure is attached to and connected to the outer wall of the box structure.

[0010] In an optional embodiment, one of the first connecting structure and the box body structure is provided with a positioning protrusion, and the other is provided with a positioning hole for the positioning protrusion to be inserted into.

[0011] In a second aspect, the present invention further provides a battery comprising a housing, an electrode assembly, a cover plate, and the electrode assembly insulating member as described above;

[0012] The electrode assembly is arranged inside the shell, the cover plate is connected to the shell and closes the shell, the box structure is sleeved between the electrode assembly and the shell, and the sealing structure is arranged between the electrode assembly and the cover plate.

[0013] In an optional embodiment, the battery includes a converter plate, the electrode assembly includes an electrode assembly body and a tab connected to the electrode assembly body, the capping structure is located between the converter plate and the electrode assembly body, the avoidance hole of the capping structure includes a tab avoidance hole, and the tab is connected to the converter plate through the tab avoidance hole.

[0014] In an optional embodiment, the tab is welded to the lower surface of the adapter plate through the tab avoidance hole to form a first welding area, and the upper surface of the cover structure is provided with a bonding area, which at least covers the first welding area.

[0015] In an optional embodiment, the battery includes a switching plate, the covering structure is located between the switching plate and the cover plate, and the avoidance hole of the covering structure includes a pole avoidance hole.

[0016] In an optional embodiment, the battery further includes a first insulating sheet, wherein the first insulating sheet is disposed between the cover plate and the adapter sheet;

[0017] And / or, the battery further includes a second insulating sheet, which is disposed between the adapter sheet and the electrode assembly.

[0018] In an optional embodiment, the electrode assembly includes an electrode assembly body and a tab connected to the electrode assembly body, the tab is welded to the upper surface of the adapter to form a second welding area, and the lower surface of the battery cover structure is provided with a bonding area, and the bonding area at least covers the second welding area.

[0019] The electrode assembly insulating part provided by the present invention has a box body structure that can cover the electrode assembly from bottom to top, and a cover structure that can cover the electrode assembly from top to bottom, thereby achieving the covering of the electrode assembly and improving the insulation performance of the electrode assembly, and the cover structure is connected to the box body structure through the first connecting structures on both sides. Compared with the problem of a smaller connection area caused by the smaller thickness of the lower plastic in the related art, the first connecting structure can partially overlap with the box body structure, so the extension distance is less affected by the height space of the battery, so the connection area between the first connecting structure and the box body structure is larger, thereby improving the connection strength between the first connecting structure and the box body structure.

[0020] The battery provided by the present invention includes the electrode assembly insulating member provided by the present invention, and thus includes all the above advantages of the electrode assembly insulating member. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is an exploded view of a battery according to an embodiment of the present utility model;

[0023] Figure 2 An exploded view of another battery according to an embodiment of the present utility model;

[0024] Figure 3 This is a structural schematic diagram of a sealing structure according to an embodiment of the present utility model;

[0025] Figure 4 for Figure 3 A schematic diagram of the expanded structure of the cover structure shown;

[0026] Figure 5 This is a structural schematic diagram of another sealing structure according to an embodiment of the present utility model;

[0027] Figure 6 for Figure 5 A schematic diagram of the expanded structure of the cover structure shown;

[0028] Figure 7 This is a schematic structural diagram of the box structure of an embodiment of the utility model;

[0029] Figure 8 for Figure 7 A schematic diagram of the expanded structure of the box structure shown;

[0030] Figure 9 This is an exploded view of the connection structure between the cover plate and the first pad according to an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Box body structure; 101. Opening; 2. Electrode assembly; 201. Tab; 3. Cover structure; 301. First connection structure; 302. Second connection structure; 303. Avoidance hole; 304. Bonding area; 4. Cover plate; 5. Pole; 6. Adapter; 7. First insulating sheet; 8. Second insulating sheet. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0034] The following combination Figures 1 to 9 , describing the electrode assembly insulating member provided in an embodiment of the present invention.

[0035] Specifically, the electrode assembly insulating member includes a box body structure 1 and a cover structure 3 .

[0036] Among them, reference Figure 7 and Figure 8 As shown, the top of the box structure 1 has an opening 101 for the electrode assembly 2 to pass through, so that the box structure 1 can be sleeved on the outside of the electrode assembly 2 from the bottom of the electrode assembly 2. Figure 8 As shown, the box structure 1 is configured as a shell structure formed by folding or turning an insulating sheet, for example, the insulating sheet is configured as a Mylar sheet.

[0037] The cover structure 3 covers the opening 101 of the box body structure 1. The cover structure 3 has a through-set avoidance hole 303. Specifically, the avoidance hole 303 is set through along the thickness direction of the cover structure 3. The avoidance hole 303 may include a tab avoidance hole or a pole avoidance hole, wherein the tab avoidance hole is used for the tab 201 to pass through, and the pole avoidance hole is used for the pole 5 to pass through; further, the avoidance hole 303 may also include an electrolyte avoidance hole and an explosion-proof valve avoidance hole, wherein the electrolyte avoidance hole is used for the electrolyte to pass through, and the explosion-proof valve avoidance hole is used to be set relative to the explosion-proof valve of the battery for the gas or liquid to pass through during the pressure relief process of the explosion-proof valve. The two sides of the cover structure 3 extending along the first direction are both provided with a first connecting structure 301. For example, referring to Figure 1As shown, the first direction may be the length direction of the battery, that is, Figure 1 The first connection structures 301 all extend toward the box structure 1 , and the first connection structures 301 are all connected to the box structure 1 .

[0038] In this embodiment, the box body structure 1 can cover the electrode assembly 2 from bottom to top, and the cover structure 3 can cover the electrode assembly 2 from top to bottom, thereby achieving the covering of the electrode assembly 2 and improving the insulation performance of the electrode assembly 2, and the cover structure 3 is connected to the box body structure 1 through the first connecting structures 301 on both sides. Compared with the problem of the smaller thickness of the lower plastic in the related art, resulting in a smaller connection area, the first connecting structure 301 can partially overlap with the box body structure 1, so the extension distance is less affected by the height space of the battery, so the first connecting structure 301 can be relatively increased, so that the connection area between the first connecting structure 301 and the box body structure 1 is larger, thereby improving the connection strength between the first connecting structure 301 and the box body structure 1.

[0039] In addition, a first connecting structure 301 is provided on both sides of the cover structure 3, which can ensure that the box body structure 1 and the cover structure 3 are subjected to balanced force, so that the box body structure 1 and the cover structure 3 have a good positioning effect, avoiding the problem of insulation failure caused by displacement of the cover structure 3 or the box body structure 1, or the different heights of the two sides of the box body structure 1.

[0040] In addition, in the related art, when the coated electrode assembly 2 is placed into the interior of the shell, the electrode assembly insulating member on the outside of the electrode assembly 2 is prone to frictional dislocation. If the dislocation is too large, the top of the electrode assembly insulating member will approach or enter the gap between the cover and the shell, which will easily increase the problem of laser welding explosion points between the cover and the shell. In the present application, the box structure 1 is connected to the cover structure 3. During the shell insertion process, the two can be positioned relative to each other, making it less likely for the box structure 1 and the cover structure 3 to shift. This can improve the fault tolerance of the electrode assembly 2 during the shell insertion and coating process, reduce the risk of explosion point failure in the laser welding of the cover and the shell, and improve the quality rate of the battery process.

[0041] In some embodiments provided by the present invention, the two sides of the cover structure 3 extending along the second direction are provided with a second connection structure 302, and the second connection structures 302 extend toward the box structure 1 and are connected to the box structure 1. The second direction intersects with the first direction, for example, the second direction is perpendicular to the first direction. Specifically, the second direction can be the width direction of the battery, that is, Figure 1 b direction in .

[0042] In this embodiment, the four sides of the cover structure 3 are connected to the box body structure 1 through corresponding connection structures, which can further improve the connection strength between the cover structure 3 and the box body structure 1.

[0043] refer to Figure 3-Figure 6 As shown, in some embodiments provided by the present invention, the cover structure 3 can be formed by folding or folding an insulating sheet. For example, the cover structure 3 includes a main body, a first folding portion, and a second folding portion. The main body is provided with the avoidance hole 303. Both sides of the main body extending in the first direction are provided with a first folding portion, which forms the first connecting structure 301. Both sides of the main body extending in the second direction are provided with a second folding portion, which forms the second connecting structure 302. Optionally, the insulating sheet is configured as a Mylar sheet.

[0044] In some embodiments provided by the present invention, the first connection structure 301 is attached to and connected to the outer wall of the box structure 1 .

[0045] In this embodiment, the box structure 1 can be first mounted on the electrode assembly 2 from bottom to top, and then the cover structure 3 can be installed. Finally, the first connection structure 301 of the cover structure 3 can be attached and connected to the outer wall of the box structure 1. The installation is relatively simple.

[0046] Furthermore, the first connection structure 301 and the second connection structure 302 are both attached to and connected to the outer wall of the box structure 1 .

[0047] Optionally, an adhesive region 304 is provided on the inner side of at least one of the first connecting structure 301 and the second connecting structure 302. The adhesive region 304 may be provided with an adhesive such as glue, double-sided tape, or solid glue, so that at least one of the first connecting structure 301 and the second connecting structure 302 is bonded to the box structure 1. This configuration can improve the connection strength between the first connecting structure 301 and the second connecting structure 302 and the box structure 1.

[0048] Of course, the first connecting structure 301 and the second connecting structure 302 are not limited to being connected to the box body structure 1 via adhesive. For example, after the first connecting structure 301 and the second connecting structure 302 are attached to the box body structure 1, they can be further fixed with adhesive tape to connect the first connecting structure 301 and the second connecting structure 302 to the box body structure 1. Alternatively, at least one of the first connecting structure 301 and the second connecting structure 302 is connected to the box body structure 1 by hot melt.

[0049] In some embodiments provided by the present invention, to improve the positioning effect between the first connecting structure 301 and the box body structure 1, one of the first connecting structure 301 and the box body structure 1 is provided with a positioning hole, and the other is provided with a positioning protrusion, the positioning hole is for the positioning protrusion to be inserted, and the positioning protrusion and the positioning hole are both limitedly engaged in a direction parallel to the surface of the box body structure 1. Optionally, a similar structure can also be used to position the second connecting structure 302 and the box body structure 1.

[0050] In some embodiments provided by the present invention, the cover structure 3 can be bonded to the cover plate 4, the adapter plate 6 or the electrode assembly 2 in the battery. It is understood that the bonding described here can be direct bonding or indirect bonding through other components. For example, referring to Figure 3 As shown, the upper surface or the lower surface of the main body of the cover structure 3 is provided with an adhesive area 304, and the adhesive area 304 can be provided with an adhesive such as glue, double-sided tape or solid glue.

[0051] In this embodiment, by bonding the cover structure 3 to the cover plate 4, the adapter sheet 6 or the electrode assembly 2, the positioning effect of the insulating part of the electrode assembly can be improved, and the cover structure 3 or the box structure 1 can be prevented from shifting.

[0052] A battery is also provided in an embodiment of the present invention.

[0053] Specifically, the battery includes a housing, an electrode assembly 2, a cover plate 4, and the electrode assembly insulating member as described above.

[0054] The electrode assembly 2 is disposed within the housing, and the cover plate 4 is connected to and seals the housing. For example, the cover plate 4 can be welded to the housing. The box structure 1 is nested between the electrode assembly 2 and the housing, and the cover structure 3 is disposed between the electrode assembly 2 and the cover plate 4. At least one of the first connection structure 301 and the second connection structure 302 of the cover structure 3 is connected to the box structure 1.

[0055] In this embodiment, the battery includes an electrode assembly insulating member, and also includes all the above-mentioned advantages of the electrode assembly insulating member, so it is not described again.

[0056] In some embodiments provided by the present invention, the battery further includes a transfer plate 6. The electrode assembly 2 includes an electrode assembly body and a tab 201 connected to the electrode assembly body. The capping structure 3 is disposed between the transfer plate 6 and the electrode assembly body. The avoidance hole 303 of the capping structure 3 includes a tab avoidance hole. The tab 201 passes through the tab avoidance hole and is connected to the transfer plate 6. Specifically, the tab may be the upper surface or the lower surface of the transfer plate 6. The transfer plate 6 is used to be connected to the pole 5 so that current can be transmitted between the tab 201, the transfer plate 6, and the pole 5.

[0057] In this embodiment, by setting the covering structure 3 between the adapter plate 6 and the electrode assembly body, on the one hand, the problem of contact short circuit between the electrode ear 201 passing through the covering structure 3 and the electrode assembly body can be avoided; on the other hand, the problem of contact short circuit between the adapter plate 6 and the electrode assembly body can be avoided.

[0058] Furthermore, to improve the insulation between the electrode assembly body and the adapter sheet 6 or the tab 201, the battery may further include a second insulating sheet 8. The second insulating sheet 8 is disposed between the electrode assembly body and the capping structure 3, or between the capping structure 3 and the adapter sheet 6. In this embodiment, the second insulating sheet 8 and the capping structure 3 form a double insulation structure, which can provide better insulation between the electrode assembly body and the adapter sheet 6 or the tab 201.

[0059] Optionally, in order to improve the positioning effect of the cover structure 3 , the cover structure 3 may be bonded to the electrode assembly 2 or the adapter sheet 6 .

[0060] In some embodiments provided by the present invention, the avoidance hole 303 on the cover structure 3 may also include an electrolyte avoidance hole and an explosion-proof valve avoidance hole. The electrolyte avoidance hole may be opposite to the injection hole on the cover plate 4, so that the electrolyte passes through the injection hole during the injection process. The explosion-proof valve avoidance hole 303 may be opposite to the explosion-proof valve on the cover plate 4, so that during the explosion-proof valve pressure relief process, the gas or liquid in the battery passes through the explosion-proof valve avoidance hole 303 and then is discharged from the explosion-proof valve.

[0061] In some embodiments provided by the present invention, the tab 201 is welded to the lower surface of the adapter plate 6 through the tab avoidance hole to form a first welding area. The upper surface of the cover structure 3 is provided with a bonding area 304, and the bonding area 304 at least covers the first welding area. In this embodiment, the bonding area 304 of the cover structure 3 can be bonded to the first welding area, thereby covering the first welding area, so that the cover structure 3 can replace the weld mark protection tape to provide insulation protection for the first welding area.

[0062] The above describes an embodiment in which the cover structure 3 is disposed between the adapter plate 6 and the electrode assembly body. It is understood that the cover structure 3 is not limited to being disposed between the adapter plate 6 and the electrode assembly body. For example, in other embodiments provided by the present invention, the battery includes the adapter plate 6, the cover structure 3 is located between the adapter plate 6 and the cover plate 4, and the avoidance hole 303 of the cover structure 3 includes a terminal avoidance hole. Specifically, the battery terminal 5 passes through the terminal avoidance hole and is connected to the cover plate 4 and the adapter plate 6, respectively.

[0063] In this embodiment, by disposing the cover structure 3 between the cover plate 4 and the adapter plate 6 , the cover structure 3 can avoid the problem of contact short circuit between the cover plate 4 and the adapter plate 6 .

[0064] Optionally, in order to improve the positioning effect of the covering structure 3 , the covering structure 3 may be bonded to the cover plate 4 or the adapter sheet 6 .

[0065] To further improve the insulation between the cover plate 4 and the adapter plate 6, in some embodiments of the present invention, the battery further includes a first insulating sheet 7. The first insulating sheet 7 is disposed between the cover plate 4 and the adapter plate 6. Alternatively, the first insulating sheet 7 can be disposed between the cover plate 4 and the cover structure 3. For example, the first insulating sheet 7 can be bonded or hot-melted to the cover plate 4. Alternatively, the first insulating sheet 7 can be disposed between the cover structure 3 and the adapter plate 6, with the first insulating sheet 7 partially passing through the cover structure and then bonded or hot-melted to the cover plate 4.

[0066] In this embodiment, the first insulating sheet 7 and the sealing structure 3 form a double insulating structure between the adapter sheet 6 and the cover plate 4 , which can provide a better insulation effect between the cover plate 4 and the adapter sheet 6 .

[0067] In some embodiments provided by the present invention, the battery further includes a second insulating sheet 8, which is disposed between the adapter sheet 6 and the electrode assembly 2. Specifically, the second insulating sheet 8 is disposed between the electrode assembly body and the adapter sheet 6. In this embodiment, by disposing the second insulating sheet 8 between the adapter sheet 6 and the electrode assembly 2, the problem of contact short circuit between the adapter sheet 6 and the electrode assembly 2 can be avoided.

[0068] In some embodiments provided herein, the electrode assembly 2 includes an electrode assembly body and a tab 201 connected to the electrode assembly body. The tab 201 is welded to the upper surface of the adapter plate 6 to form a second welding area. The lower surface of the battery cover structure 3 is provided with a bonding area 304 that at least covers the second welding area.

[0069] In this embodiment, the bonding area 304 of the cover structure 3 can be bonded to the second welding area to cover the second welding area, so that the cover structure 3 can replace the weld protection tape to provide insulation protection for the second welding area.

[0070] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. An electrode assembly insulating member, characterized in that: include: A box structure (1), wherein the top of the box structure (1) is provided with an opening (101) for the electrode assembly (2) to pass through; A cover structure (3), the cover structure (3) covers the opening (101), the cover structure (3) has a through-going avoidance hole (303), both sides of the cover structure (3) extending in a first direction are provided with first connecting structures (301), the first connecting structures (301) extend toward the box body structure (1), and the first connecting structures (301) are connected to the box body structure (1).

2. The electrode assembly insulating member according to claim 1, wherein: The two sides of the cover structure (3) extending along the second direction are both provided with a second connecting structure (302), the second connecting structures (302) are both extended toward the box body structure (1), the second connecting structures (302) are both connected to the box body structure (1), and the second direction intersects with the first direction.

3. The electrode assembly insulating member according to claim 1, wherein: The first connection structure (301) is attached to and connected to the outer wall of the box structure (1).

4. The electrode assembly insulating member according to any one of claims 1 to 3, characterized in that: One of the first connection structure (301) and the box structure (1) is provided with a positioning protrusion, and the other is provided with a positioning hole for the positioning protrusion to be inserted into.

5. A battery, characterized in that: Comprising a housing, an electrode assembly (2), a cover plate (4), and an electrode assembly insulating member according to any one of claims 1 to 4; The electrode assembly (2) is arranged inside the shell, the cover plate (4) is connected to the shell and seals the shell, the box structure (1) is sleeved between the electrode assembly (2) and the shell, and the cover structure (3) is arranged between the electrode assembly (2) and the cover plate (4).

6. The battery according to claim 5, characterized in that The battery further comprises a switching plate (6), the electrode assembly (2) comprises an electrode assembly body and a tab (201) connected to the electrode assembly body, the capping structure (3) is located between the switching plate (6) and the electrode assembly body, the avoidance hole (303) of the capping structure (3) comprises a tab avoidance hole, and the tab (201) passes through the tab avoidance hole and is connected to the switching plate (6).

7. The battery according to claim 6, characterized in that The tab (201) is welded to the lower surface of the adapter plate (6) through the tab avoidance hole to form a first welding area, and the upper surface of the cover structure (3) is provided with a bonding area (304), and the bonding area (304) at least covers the first welding area.

8. The battery according to claim 5, characterized in that The battery comprises a switching plate (6), the cover structure (3) is located between the switching plate (6) and the cover plate (4), and the avoidance hole (303) of the cover structure (3) comprises a pole avoidance hole.

9. The battery according to claim 8, characterized in that The battery further comprises a first insulating sheet (7), wherein the first insulating sheet (7) is arranged between the cover plate (4) and the adapter sheet (6); And / or, the battery further comprises a second insulating sheet (8), wherein the second insulating sheet (8) is arranged between the adapter sheet (6) and the electrode assembly (2).

10. The battery according to claim 8, characterized in that The electrode assembly (2) comprises an electrode assembly body and a tab (201) connected to the electrode assembly body, the tab (201) being welded to the upper surface of the adapter sheet (6) to form a second welding area, and the lower surface of the cover structure (3) is provided with a bonding area (304), and the bonding area (304) at least covers the second welding area.

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