Battery assembly structure and battery

Abstract

The utility model relates to the field of batteries, and discloses a battery assembly structure and a battery. The battery assembly structure comprises a cover plate, a first gasket, an adapter plate, a second gasket and a battery cell which are arranged in sequence, wherein a tab of the battery cell is connected with the adapter plate, and the second gasket is arranged between the adapter plate and the battery cell; the first gasket is arranged below the cover plate; one of the first gasket and the second gasket is provided with a positioning protrusion, the other one of the first gasket and the second gasket is provided with a positioning recess allowing the positioning protrusion to be placed therein, and at least part of the positioning protrusion extends into the positioning recess to achieve limiting fit between the first gasket and the second gasket. The second gasket and the first gasket are in limiting fit in the direction parallel to the first gasket or the second gasket through the positioning protrusions and the positioning recesses, so that the first gasket can limit transverse dislocation of the second gasket, and the second gasket has a stable position; therefore, the problem of electrode lug extrusion or cutting caused by dislocation of the second gasket can be avoided.

Description

Technical Field

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

[0002] With the continuous development of fields such as materials science and electrochemistry, the performance of batteries has been significantly improved. Improving the performance of batteries has always been the goal pursued tirelessly by practitioners in this field.

[0003] In related technologies, a battery typically includes a cover plate, a first gasket (the lower plastic layer beneath the cover plate), an adapter plate, a second gasket, and a battery cell. The first gasket is typically connected to the cover plate by direct heat-seal welding, while the second gasket is directly connected to the bottom of the adapter plate, positioning the second gasket between the battery cell and the adapter plate to provide insulation protection for the adapter plate.

[0004] Batteries in the related art lack an effective means of limiting the second gasket between the adapter and the battery cell, resulting in the second gasket being prone to lateral misalignment. Furthermore, when the second gasket is misaligned, it can easily cut or squeeze the tab, affecting battery stability. Utility Model Content

[0005] In view of this, the present invention provides a battery assembly structure and a battery to solve the problem that the battery in the related art lacks an effective means to limit the second gasket between the adapter and the battery cell, which makes the second gasket prone to lateral misalignment.

[0006] In a first aspect, the utility model provides a battery assembly structure, comprising a cover plate, a first gasket, a switching plate, a second gasket and a battery cell arranged in sequence;

[0007] The tab of the battery cell is connected to the adapter, and the second gasket is arranged between the adapter and the battery cell; the first gasket is arranged below the cover plate;

[0008] One of the first gasket and the second gasket is provided with a positioning protrusion, and the other is provided with a positioning recess for the positioning protrusion to be placed in. The positioning protrusion at least partially extends into the positioning recess to achieve a limited fit between the first gasket and the second gasket.

[0009] In an optional embodiment, the positioning protrusions are arranged in at least two groups, and the at least two groups of positioning protrusions are arranged at intervals along the width direction of the first gasket or the second gasket, each group of positioning protrusions includes multiple positioning protrusions, and the multiple positioning protrusions in each group of positioning protrusions (401) are arranged at intervals along the length direction of the first gasket or the second gasket, and the positioning recesses are limitedly matched with the positioning protrusions in a one-to-one correspondence.

[0010] In an optional embodiment, a bare cell insulating sheet is further included, wherein the bare cell insulating sheet forms a box structure with an opening at one end, the bare cell insulating sheet is mounted on the outside of the cell, and the opening faces the cover plate, and the edge of the opening is provided with an extension portion extending toward the inside of the opening, the extension portion extends between the first gasket and the second gasket, and the extension portion is provided with a through hole for the positioning protrusion to pass through.

[0011] In an optional embodiment, the bare cell insulating sheet includes a side area, a bottom area and a connection area;

[0012] The bottom area is opposite to the bottom surface of the battery cell, and the side areas are set as a pair, and the pair of side areas are respectively opposite to the large surfaces on both sides of the battery cell, and the side areas are both connected to the bottom area. The edges on both sides of the side areas are connected to the connection area, and the connection area is opposite to the small surface on one side of the battery cell. The extension portion is provided at one end of the side area away from the bottom area.

[0013] In an optional embodiment, a notch is provided on a side of the connecting area facing away from the side area, and the notches of two connected connecting areas are spliced together to form a window.

[0014] In an optional embodiment, the bottom region and the connecting region are both connected to the side regions via corresponding crease lines.

[0015] In an optional embodiment, a first rib and a second rib are provided on the surface of the first gasket facing the second gasket, the first rib abuts against the portion of the adapter plate connected to the tab, and the second rib abuts against the second gasket.

[0016] In an optional embodiment, the positioning protrusion is provided on the second gasket.

[0017] In an optional embodiment, the adapter plate includes an adapter plate body and a pole arranged on the adapter plate body, the pole lug of the battery cell is connected to the adapter plate body of the adapter plate, and the pole is connected to the cover plate.

[0018] In a second aspect, the utility model also provides a battery, comprising a shell and the battery assembly structure as described above, wherein the shell is configured as a box structure with an opening, the battery cell is arranged inside the shell, the cover plate covers the opening, and the cover plate is connected to the shell.

[0019] In the battery assembly structure provided by the utility model, the second gasket and the first gasket are matched through the positioning protrusion and the positioning recess, so that they are limited in the direction parallel to the first gasket or the second gasket, so that the first gasket can limit the lateral misalignment of the second gasket, so that the second gasket has a stable position, thereby avoiding the problem of extrusion or cutting of the pole ear caused by the misalignment of the second gasket.

[0020] Since the battery provided by the present invention includes the battery assembly structure provided by the present invention, it also includes all the advantages of the battery assembly structure mentioned above, so they will not be described in detail. 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 a schematic diagram of the explosion structure of a battery according to an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 The schematic diagram of the structure of the battery after the outer shell is removed;

[0024] Figure 3 This is a schematic structural diagram of a bare cell insulation sheet forming a box structure according to an embodiment of the utility model;

[0025] Figure 4 for Figure 3 The schematic diagram of the structure of the bare cell insulation sheet is shown;

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

[0027] Figure 6 This is a schematic structural diagram of the second gasket in an embodiment of the present utility model.

[0028] Description of reference numerals:

[0029] 1. Cover plate; 2. First gasket; 201. Positioning depression; 202. First rib; 203. Second rib; 3. Adapter; 4. Second gasket; 401. Positioning protrusion; 402. Avoidance hole; 5. Battery cell; 6. Bare battery cell insulating sheet; 601. Extension portion; 602. Side area; 603. Bottom area; 604. Connection area; 605. Notch; 606. Crease line; 607. Through hole; 7. Housing; 8. Blue film; 9. Pole. DETAILED DESCRIPTION

[0030] 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.

[0031] The following combination Figures 1 to 6 , describing the battery assembly structure provided in an embodiment of the present utility model.

[0032] Specifically, the battery assembly structure includes a cover plate 1, a first gasket 2, a switching plate 3, a second gasket 4 and a battery cell 5 which are arranged in sequence.

[0033] The tabs of the battery cell 5 are connected to the adapter 3 , for example, the tabs can be welded to the adapter 3 , and the second gasket 4 is arranged between the adapter 3 and the battery cell 5 ; the first gasket 2 is arranged below the cover plate 1 .

[0034] One of the first gasket 2 and the second gasket 4 is provided with a positioning protrusion 401, and the other is provided with a positioning recess 201 for receiving the positioning protrusion 401. The positioning protrusion 401 at least partially extends into the positioning recess 201 to achieve a limited fit between the first gasket 2 and the second gasket 4; specifically, this arrangement allows for a limited fit at least in a direction parallel to the first gasket 2 or the second gasket 4.

[0035] In this embodiment, the second gasket 4 and the first gasket 2 are limited in position in a direction parallel to the first gasket 2 or the second gasket 4 through the positioning protrusion 401 and the positioning recess 201, so that the first gasket 2 can limit the lateral misalignment of the second gasket 4, so that the second gasket 4 has a stable position, thereby avoiding the problem of extrusion or cutting of the pole ear caused by the misalignment of the second gasket 4.

[0036] In some embodiments provided by the present invention, the positioning protrusions 401 are provided in at least two groups, and the at least two groups of positioning protrusions 401 are arranged at intervals along the width direction of the first gasket 2 or the second gasket 4. Each group of positioning protrusions 401 includes multiple positioning protrusions 401, and the multiple positioning protrusions 401 in each group of positioning protrusions 401 are arranged at intervals along the length direction of the first gasket 2 or the second gasket 4. The positioning recesses 201 and the positioning protrusions 401 are in a one-to-one corresponding positional fit. For example Figure 5 or Figure 6 As shown, the direction a in the figure is the length direction, and the direction b in the figure is the width direction.

[0037] In this embodiment, since the second gasket 4 has a certain degree of flexibility, the provision of at least two sets of positioning protrusions 401 ensures the positioning of the second gasket 4. Furthermore, by providing at least two sets of positioning protrusions 401, when the cover plate 1 is connected to the battery housing 7, the pressure of the cover plate 1 is dispersed through the various positioning protrusions 401 to the battery cells 5, thereby evenly applying force to the battery cells 5 and reducing the problem of stress concentration on the battery cells 5.

[0038] Optionally, as shown in the figure, a positioning recess 201 is provided on the first gasket 2, and a positioning protrusion 401 is provided on the second gasket 4, with the positioning recess 201 being provided throughout. The positioning protrusion 401 passes through the positioning recess 201 and contacts the cover plate 1. When the cover plate 1 is connected to the battery housing 7, the pressure of the cover plate 1 acts on the battery cell 5 through the various positioning protrusions 401 and the second gasket 4. Of course, the method of providing the positioning protrusion 401 on the first gasket 2 and the positioning recess 201 on the second gasket 4 can also be adopted.

[0039] Optionally, the positioning protrusion 401 is configured as a cylindrical structure, and the positioning recess 201 is configured as a circular hole. This configuration makes the structures of both the positioning protrusion 401 and the positioning recess 201 simpler.

[0040] In some embodiments provided by the present invention, the battery assembly structure further includes a bare cell insulating sheet 6 , and the bare cell insulating sheet 6 forms a box structure with one end open.

[0041] The bare cell insulating sheet 6 is mounted on the outside of the cell 5, with its opening facing the cover 1. An extension 601 is provided at the edge of the opening, extending inward. The extension 601 extends between the first gasket 2 and the second gasket 4, and is provided with a through-hole 607 for the positioning protrusion 401 to pass through. For example, the through-hole 607 of the extension 601 and the positioning protrusion 401 can be engaged in a positional limit in a direction at least parallel to the first gasket 2 or the second gasket 4.

[0042] In the related art, the bare cell insulating sheet 6 is connected to the first gasket 2 by hot melting, and in order to ensure the firmness of the connection between the two, the thickness of the first gasket 2 is usually thicker. In this embodiment, the bare cell insulating sheet 6 is provided with an extension portion 601, and the extension portion 601 is limited by the through hole 607 and the positioning protrusion 401. There is no need to connect the bare cell insulating sheet 6 to the first gasket 2 by hot melting, thereby reducing the thickness of the first gasket 2, thereby saving the space occupied by the first gasket 2, improving the space utilization inside the battery, and reducing the weight and cost of the first gasket 2. In addition, by limiting the through hole 607 and the positioning protrusion 401, the hot melting process of the bare cell insulating sheet 6 can be omitted, thereby improving the production efficiency of the battery. By wrapping the battery cell 5 with the bare cell insulating sheet 6, the battery cell 5 can be insulated from the battery shell 7.

[0043] In some embodiments provided by the present invention, the bare cell insulating sheet 6 includes a side area 602 , a bottom area 603 and a connection area 604 .

[0044] Among them, the bottom surface area 603 is opposite to the bottom surface of the battery cell 5. The side surface areas 602 are set as a pair, and the pair of side surface areas 602 are respectively opposite to the large surfaces on both sides of the battery cell 5. It should be noted that the large surfaces on both sides of the battery cell 5 refer to the two sides with relatively larger areas among the four sides of the battery cell 5. The side surface areas 602 are all connected to the bottom surface area 603, and the edges on both sides of the side surface areas 602 are connected to the connection areas 604. The connection area 604 is connected to the small surface on one side of the battery cell 5. It should be noted that the small surface of the battery cell 5 refers to the side with relatively smaller area among the four sides of the battery cell 5. An extension portion 601 is provided at the end of the side surface area 602 away from the bottom surface area 603.

[0045] In this embodiment, the bottom area 603 covers the bottom surface of the battery cell 5, the side area 602 and the connection area 604 cover the side surfaces of the battery cell 5, and the top surface of the battery cell 5 is covered by the second gasket 4, thereby forming all-round coverage of the battery cell 5, so that the battery cell 5 can be insulated from the battery shell 7. By limiting the extension 601 of the side area 602 and the positioning protrusion 401, it is not necessary to connect the bare battery cell insulation sheet 6 to the first gasket 2 by hot-melt, thereby reducing the thickness of the first gasket 2, thereby saving the space occupied by the first gasket 2, improving the space utilization inside the battery, and reducing the weight and cost of the first gasket 2. In addition, by limiting the extension 601 and the positioning protrusion 401, the hot-melt process of the bare battery cell insulation sheet 6 can be omitted, thereby improving the production efficiency of the battery.

[0046] In some embodiments provided by the present invention, a notch 605 is provided on the side of the connection area 604 facing away from the side area 602, and the notches 605 of two adjacent connection areas 604 are spliced to form a window. In this embodiment, after the notches 605 of the two connected connection areas 604 form a window, the window can be covered with tape. Specifically, the tape outside the range of the window is bonded to the connection area 604, and the tape within the range of the window is bonded to the battery cell 5. In this way, the bare battery cell insulating sheet 6 and the coil are connected by the tape, preventing the bare battery cell insulating sheet 6 from moving relative to the coil.

[0047] In some embodiments of the present invention, the bottom area 603 and the connection area 604 are connected to the side area 602 via corresponding crease lines 606. This arrangement facilitates folding the bare cell insulation sheet 6 along the crease lines 606 to form a box structure that can be fitted around the outside of the battery cell 5.

[0048] Furthermore, the extension portion 601 is connected to the side area 602 via a corresponding crease line 606 , so that the extension portion 601 can be folded to the inside of the opening via the crease line 606 .

[0049] In some embodiments provided by the present invention, the adapter 3 includes an adapter body and a pole 9 arranged on the adapter body. The pole ear of the battery cell 5 is connected to the adapter body of the adapter 3, and the pole 9 is connected to the cover 1.

[0050] In some embodiments provided by the present invention, the adapter body and the pole 9 can be integrally provided or formed by welding them separately.

[0051] In some embodiments provided by the present invention, a cover plate pole is further provided on the cover plate 1, and a pole through-hole is provided on the cover plate pole, and a gasket through-hole is also provided on the first gasket 2, and the gasket through-hole and the pole through-hole are connected, and the pole 9 passes through the gasket through-hole and the pole through-hole in sequence and is electrically connected to the cover plate pole.

[0052] In some embodiments provided by the present invention, a first rib 202 and a second rib 203 are provided on the surface of the first gasket 2 facing the second gasket 4. The first rib 202 abuts against the portion of the adapter 3 connected to the tab, and the second rib 203 abuts against the second gasket 4.

[0053] In this embodiment, the first rib 202 can compress the connection between the tab and the adapter 3. For example, if the tab and adapter 3 are welded together, the first rib 202 can compress the welding position of the tab and adapter 3, thereby reducing vibration of the tab and preventing the welding position from loosening or breaking due to vibration. When the cover plate 1 is connected to the housing 7, the pressure of the cover plate 1 can be dispersed to the battery cell 5 through the positioning protrusion 401 and the second rib 203, thereby reducing the stress concentration problem on the battery cell 5.

[0054] Specifically, the first rib 202 and the second rib 203 both extend along the width direction of the first gasket 2. Figure 5 As shown, the b direction in the figure is the width direction.

[0055] In some embodiments provided by the present invention, the second gasket 4 is provided with an avoidance hole 402 for the tab to pass through. The avoidance hole 402 is configured as a long hole, and the long hole extends along the length direction of the second gasket 4. In this embodiment, by configuring the avoidance hole 402 as a long hole, the long tab can pass through the avoidance hole 402. Figure 6 As shown, the a direction in the figure is the length direction.

[0056] In some embodiments provided by the present invention, a transfer plate through hole is provided on the transfer plate body of the transfer plate 3, and the tabs of the battery cell 5 can pass through the avoidance hole 402 and the transfer plate through hole in sequence and then be electrically connected to the upper surface of the transfer plate body.

[0057] A battery is also provided in an embodiment of the present invention.

[0058] Specifically, the battery includes a shell 7 and the above battery assembly structure. The shell 7 is configured as a box structure with an open opening. The battery cell 5 is disposed inside the shell 7 . The cover 1 covers the open opening, and the cover 1 is connected to the shell 7 .

[0059] It should be noted that the battery includes the battery assembly structure, and also includes all the advantages of the battery assembly structure mentioned above, so it will not be described in detail.

[0060] Optionally, the exterior of the housing 7 is covered with a blue film 8 .

[0061] 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. A battery assembly structure, characterized in that: It comprises a cover plate (1), a first gasket (2), a switching plate (3), a second gasket (4) and a battery core (5) which are arranged in sequence; The tab of the battery cell (5) is connected to the adapter plate (3), and the second gasket (4) is arranged between the adapter plate (3) and the battery cell (5); the first gasket (2) is arranged below the cover plate (1); One of the first gasket (2) and the second gasket (4) is provided with a positioning protrusion (401), and the other is provided with a positioning recess (201) for the positioning protrusion (401) to be placed therein, and the positioning protrusion (401) at least partially extends into the positioning recess (201) to achieve a limited fit between the first gasket (2) and the second gasket (4).

2. The battery assembly structure according to claim 1, characterized in that: The positioning protrusions (401) are arranged in at least two groups, and the at least two groups of positioning protrusions (401) are arranged at intervals along the width direction of the first gasket (2) or the second gasket (4), and each group of positioning protrusions (401) includes multiple positioning protrusions (401). The multiple positioning protrusions (401) in each group of positioning protrusions (401) are arranged at intervals along the length direction of the first gasket (2) or the second gasket (4), and the positioning recesses (201) are limitedly matched with the positioning protrusions (401) in a one-to-one correspondence.

3. The battery assembly structure according to claim 1, characterized in that: The invention also includes a bare cell insulating sheet (6), wherein the bare cell insulating sheet (6) forms a box structure with an opening at one end, the bare cell insulating sheet (6) is sleeved on the outer side of the cell (5), and the opening faces the cover plate (1), and the edge of the opening is provided with an extension portion (601) extending toward the inner side of the opening, the extension portion (601) extends between the first gasket (2) and the second gasket (4), and the extension portion (601) is provided with a through hole (607) for the positioning protrusion (401) to pass through.

4. The battery assembly structure according to claim 3, characterized in that: The bare cell insulating sheet (6) comprises a side surface area (602), a bottom surface area (603) and a connection area (604); The bottom surface area (603) is opposite to the bottom surface of the battery cell (5), and the side surface areas (602) are provided as a pair. The pair of side surface areas (602) are respectively opposite to the large surfaces on both sides of the battery cell (5). The side surface areas (602) are both connected to the bottom surface area (603). The edges on both sides of the side surface areas (602) are connected to the connection areas (604). The connection areas (604) are opposite to the small surface on one side of the battery cell (5). The end of the side surface area (602) away from the bottom surface area (603) is provided with the extension part (601).

5. The battery assembly structure according to claim 4, characterized in that: A notch (605) is provided on the side of the connection area (604) facing away from the side area (602), and the notches (605) of the two connected connection areas (604) are spliced together to form a window.

6. The battery assembly structure according to claim 4, characterized in that: The bottom area (603) and the connecting area (604) are both connected to the side area (602) via corresponding crease lines (606).

7. The battery assembly structure according to claim 1, characterized in that: A first convex rib (202) and a second convex rib (203) are provided on the surface of the first gasket (2) facing the second gasket (4); the first convex rib (202) abuts against the portion of the adapter plate (3) connected to the tab, and the second convex rib (203) abuts against the second gasket (4).

8. The battery assembly structure according to claim 1, characterized in that: The positioning protrusion (401) is arranged on the second gasket (4).

9. The battery assembly structure according to claim 1, characterized in that: The adapter plate (3) comprises an adapter plate body and a pole (9) arranged on the adapter plate body, the pole lug of the battery cell (5) is connected to the adapter plate body of the adapter plate (3), and the pole (9) is connected to the cover plate (1).

10. A battery, characterized in that: The invention comprises a housing (7) and a battery assembly structure according to any one of claims 1 to 9, wherein the housing (7) is configured as a box structure with an opening, the battery cell (5) is arranged inside the housing (7), the cover plate (1) covers the opening, and the cover plate (1) is connected to the housing (7).

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