Single battery and battery pack

Abstract

The utility model is applicable to the technical field of batteries, and discloses a single battery and a battery pack, the single battery comprises a top cover, lower plastic, a pole component, an insulating film and a battery cell, and the top cover is provided with a pole hole; the lower plastic is connected with one side of the top cover; the pole assembly is fixedly arranged in the pole hole; the insulating film is fixedly arranged on one side, far away from the top cover, of the lower plastic through the pole assembly, and an accommodating cavity is defined by the insulating film; the battery cell is fixedly arranged in the accommodating cavity and is electrically connected with the pole component; compared with the traditional scheme of welding the insulating film and the lower plastic, the scheme provided by the utility model has the advantages that a boss structure specially used for fixing the insulating film does not need to be arranged on the lower plastic, and the insulating film does not need to be welded and fixed on the peripheral side wall of the lower plastic, so that the overall thickness of the lower plastic can be effectively reduced, and the accommodating cavity can be made larger; and the accommodating cavity can accommodate a larger battery cell, so that the energy density of the single battery is improved.

Description

Technical Field

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

[0002] Current new energy battery packs, especially power battery packs, need to have a greater energy density in order to store more energy in a limited space, thereby increasing the driving range. The current cell structure mainly includes cells for storing electrical energy (positive plates and positive electrode materials, negative plates and negative electrode materials, separators, tabs, etc.) and cell-related structural parts (top cover plates, shells, current collectors, MYLAR bags, bottom trays, etc.). In the limited outer space of the shell, the larger the internal space of the shell occupied by the cell, the higher the energy density of the cell space. Therefore, how to improve the energy density of the battery pack is an urgent issue that needs to be solved. Utility Model Content

[0003] One purpose of the utility model is to provide a single cell and a battery pack, which are intended to solve the technical problem of low battery energy density.

[0004] To achieve the above-mentioned purpose, the utility model provides a solution: a single cell and a battery pack, the single cell comprising a top cover, a lower plastic, a pole assembly, an insulating film and a battery cell, the top cover is provided with a pole hole; the lower plastic is connected to one side of the top cover; the pole assembly is fixed in the pole hole; the insulating film is fixed to the side of the lower plastic away from the top cover through the pole assembly, and the insulating film is surrounded to form a accommodating cavity; the battery cell is fixed in the accommodating cavity and is electrically connected to the pole assembly.

[0005] As an implementation mode, the battery cell includes a battery cell body and a pole tab, which are electrically connected to the battery cell body; the pole assembly includes a pole and a bus bar, the pole is fixed in the pole hole, the insulating film is fixed to the side of the lower plastic away from the top cover through the bus bar, and the other side of the bus bar is electrically connected to the pole tab.

[0006] As an implementation mode, the single cell further includes a spacer, the pole ear is bent and electrically connected to the busbar along its thickness direction, and the spacer is arranged at the bent portion of the pole ear.

[0007] As an embodiment, the isolation sheet includes a first portion and a second portion which are integrally connected, the first portion is arranged at the bending position of the pole ear, the first portion is a multi-layer structure, and the second portion is a single-layer structure.

[0008] As an implementation mode, one of the isolation plate and the lower plastic is provided with a limiting protrusion, and the other of the isolation plate and the lower plastic is provided with a limiting groove, and the limiting protrusion and the limiting groove cooperate to limit the movement of the isolation plate.

[0009] As an embodiment, the insulating film includes a side portion and a top portion that are integrally connected, the side portion is arranged on the peripheral side of the top portion, and the top portion is fixed to the side of the lower plastic away from the top cover through a pole assembly; the side portion is bent into multiple portions on the peripheral side of the top portion, the multiple side portions are interconnected, and together with the top portion, form a accommodating cavity.

[0010] As an embodiment, the pole assembly includes a pole, a pole hole is arranged around the top cover and is sunken to form a first step, the pole is assembled in the pole hole and partially extends to the first step and a side opposite to the first step, and the lower plastic is fixed to a side of the top cover away from the first step through the pole.

[0011] As an embodiment, the pole includes a main body, an upper skirt and a lower skirt, the upper skirt and the lower skirt are arranged on the peripheral side wall of the main body, the main body is assembled in the pole hole, the upper skirt overlaps on one side surface of the first step, and the lower plastic is fixed to the side of the top cover away from the first step through the lower skirt; the pole assembly also includes an upper plastic, the top cover is surrounded by the first step to form a second step, and the upper plastic is connected to the upper skirt and overlaps on the second step.

[0012] As an implementation mode, the upper plastic is injection molded on the peripheral side of the upper skirt; the upper skirt is provided with a blind hole or a through hole, and part of the upper plastic is accommodated in the blind hole or the through hole.

[0013] In order to achieve the above-mentioned object, another solution provided by the present invention is: a battery pack, which includes: a box body and a plurality of single cells of any one of the above items, wherein the plurality of single cells are arranged in the box body.

[0014] Compared with the prior art, the monomer battery and door lock of the embodiment of the utility model have the following beneficial effects: the insulating film forms a accommodating cavity for fixing the battery cell, and the insulating film is further fixed to the side of the lower plastic away from the top cover through the pole assembly. Compared with the traditional solution of welding the insulating film and the lower plastic, the present solution does not need to set a specific boss structure for fixing the insulating film on the lower plastic, nor does it need to weld the insulating film to the peripheral side wall of the lower plastic, thereby effectively reducing the overall thickness of the lower plastic, and then the accommodating cavity can be made larger, and the accommodating cavity can accommodate larger battery cells, thereby improving the energy density of the monomer battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1It is a three-dimensional schematic diagram of a single battery provided by an embodiment of the utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of a single cell provided by an embodiment of the utility model;

[0018] Figure 3 The utility model embodiment provides Figure 2 A partial enlarged schematic diagram of the middle A area;

[0019] Figure 4 It is a three-dimensional schematic diagram of an insulating film provided by an embodiment of the utility model;

[0020] Figure 5 It is a three-dimensional schematic diagram of a spacer provided in an embodiment of the utility model;

[0021] Figure 6 It is a three-dimensional schematic diagram of the top cover provided by the embodiment of the utility model;

[0022] Figure 7 It is a three-dimensional schematic diagram of a pole provided by an embodiment of the utility model.

[0023] Description of Figure Numbers:

[0024] Top cover 10, pole hole 12, first step 14, second step 16, lower plastic 20, pole assembly 30; pole 31, main body 35, upper skirt 36, lower skirt 37, blind hole 38, bus bar 32, sealing ring 33; upper plastic 34, insulating film 40, accommodating cavity 401, connecting hole 402, side 41, top 42, battery cell 50; battery cell body 52, pole ear 54, isolation sheet 60, limiting groove 601, first part 61, second part 63. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] See also Figures 1 to 3 , Figure 1is a three-dimensional schematic diagram of a single battery provided by an embodiment of the utility model, Figure 2 is a cross-sectional schematic diagram of a single cell provided in an embodiment of the utility model, Figure 3 The utility model embodiment provides Figure 2 A partial enlarged schematic diagram of area A in the middle.

[0028] The single cell battery of the utility model includes a top cover 10, a lower plastic 20, a pole assembly 30, an insulating film 40 and a battery cell 50. The top cover 10 is provided with a pole hole 12, and the pole hole 12 passes through two opposite sides of the top cover 10. The lower plastic 20 is connected to one side of the top cover 10, and the material of the lower plastic 20 is plastic, and the lower plastic 20 has insulating properties. The pole assembly 30 is fixed in the pole hole 12, and the pole assembly 30 plays a role in conducting electricity. The insulating film 40 is fixed to the side of the lower plastic 20 away from the top cover 10 through the pole assembly 30, and the insulating film 40 is surrounded to form a accommodating cavity 401. The battery cell 50 is fixed in the accommodating cavity 401 and is electrically connected to the pole assembly 30.

[0029] In this embodiment, the insulating film 40 forms a accommodating cavity 401 for fixing the battery cell 50, and the insulating film 40 is further fixed to the side of the lower plastic 20 away from the top cover 10 through the pole assembly 30. Compared with the traditional welding solution of the insulating film 40 and the lower plastic 20, this solution does not need to set a specific boss structure for fixing the insulating film 40 on the lower plastic 20, nor does it need to weld the insulating film 40 to the peripheral side wall of the lower plastic 20, thereby effectively reducing the overall thickness of the lower plastic 20, and then the accommodating cavity 401 can be made larger, and the accommodating cavity 401 can accommodate larger battery cells 50, thereby improving the energy density of the single battery.

[0030] In one embodiment, the battery cell 50 includes a battery cell body 52 and a tab 54, and the tab 54 is electrically connected to the battery cell body 52. ​​The pole assembly 30 includes a pole 31 and a busbar 32, the pole 31 is fixed to the pole hole 12 and connected to the top cover 10, the insulating film 40 is provided with a connection hole 402 adapted to the pole 31, and the aperture of the connection hole 402 is smaller than the outer size of the busbar 32, the busbar 32 and the pole 31 can be welded and connected, the busbar 32 is connected to the pole 31 and the lower plastic 20 clamps and fixes the insulating film 40, that is, the insulating film 40 is fixed to the side of the lower plastic 20 away from the top cover 10 through the busbar 32, one side of the busbar 32 clamps and fixes the insulating film 40 on the lower plastic 20, and the other side of the busbar 32 is electrically connected to the tab 54. The busbar 32 not only integrates the tabs 54 on the battery cell 50, but also serves to fix the insulating film 40. Without adding new parts, the busbar 32 is reused, which not only saves extra parts to fix the insulating film 40, but also saves the fixing process of the insulating film 40.

[0031] See also Figures 1 to 3 ,as well as Figure 5 , Figure 5 It is a three-dimensional schematic diagram of the isolation sheet 60 provided in the embodiment of the utility model.

[0032] The single cell also includes a separator 60. The tab 54 is bent and electrically connected to the busbar 32 along its thickness direction. The bent tab 54 plays a certain buffering effect between the busbar 32 and the battery body 52, so as to prevent the battery body 52 from pulling the tab 54 off the busbar 32 during shaking. In addition, the bent tab 54 is also convenient for assembly. The separator 60 is set at the bend of the tab 54. The separator 60 can control the bending amplitude of the tab 54 at the bend, reducing the risk of the tab 54 breaking. The bend of the separator 60 toward the tab 54 can be an arc structure, so as to prevent the separator 60 from piercing the tab 54.

[0033] The isolation sheet 60 includes a first portion 61 and a second portion 63 connected in an integral manner. The first portion 61 is disposed at the bend of the pole ear 54. The first portion 61 is a multi-layer structure, and the second portion 63 is a single-layer structure. The first portion 61 may be a double-layer structure, a three-layer structure, etc., which is not limited here. The first portion 61 of the multi-layer structure has a strengthened structural strength, which can prevent the pole ear 54 from piercing the first portion 61.

[0034] One of the isolation sheet 60 and the lower plastic 20 is provided with a limiting convex portion, and the other of the isolation sheet 60 and the lower plastic 20 is provided with a limiting groove 601, and the limiting convex portion and the limiting groove 601 cooperate to limit the movement of the isolation sheet 60. Specifically, there are two situations:

[0035] In one embodiment, the isolation sheet 60 is provided with a limiting protrusion, and the lower plastic 20 is provided with a limiting groove 601 , and the limiting protrusion is inserted into the limiting groove 601 , so as to prevent the isolation sheet 60 from shaking relative to the lower plastic 20 .

[0036] In another case, the isolation sheet 60 is provided with a limiting groove 601 , and the lower plastic 20 is provided with a limiting convex portion, and the limiting convex portion is inserted into the limiting groove 601 , thereby preventing the isolation sheet 60 from shaking relative to the lower plastic 20 .

[0037] See also Figures 1 to 4 , Figure 4 It is a three-dimensional schematic diagram of the insulating film 40 provided in the embodiment of the utility model.

[0038] The insulating film 40 includes a side portion 41 and a top portion 42 which are connected in one piece. The side portion 41 is arranged on the peripheral side of the top portion 42. The top portion 42 is fixed to the side of the lower plastic 20 away from the top cover 10 through the pole assembly 30. The top portion 42 has a pulling effect on the side portion 41. The side portion 41 is bent into multiple parts on the peripheral side of the top portion 42. Multiple folds can be preset on the side portion 41 to facilitate the side portion 41 to fold into a fixed shape according to the preset folds. The multiple side portions 41 are connected to each other and are surrounded together with the top portion 42 to form a receiving cavity 401. The side portion 41 has a pulling effect on the battery cell 50. The side portions 41 can be stacked at the connection, and the stacked parts are melt-connected and fixed, thereby improving the connection strength.

[0039] See also Figures 1 to 3 ,as well as Figure 6 and Figure 7 , Figure 6 is a three-dimensional schematic diagram of a top cover 10 provided in an embodiment of the utility model, Figure 7 It is a three-dimensional schematic diagram of the pole 31 provided in the embodiment of the utility model.

[0040] Furthermore, the top cover 10 is surrounded by the pole hole 12 and is sunken to form a first step 14, the first step 14 is located on the side of the top cover 10 away from the lower plastic 20, the first step 14 is sunken relative to the top cover 10, the pole 31 is assembled in the pole hole 12 and partially extends to the first step 14 and the side opposite to the first step 14, the pole 31 is clamped on the opposite sides of the top cover 10, and the lower plastic 20 is fixed to the side of the top cover 10 away from the first step 14 through the pole 31. In this embodiment, the first step 14 can partially reduce the thickness of the top cover 10, so that this part of the space can be used to accommodate the pole 31, and the distance between the top surface of the pole 31 and the top cover 10 is further reduced, the space above the top cover 10 occupied by the pole 31 is reduced, and the single battery can be made larger, thereby improving the energy density of the battery pack.

[0041] Specifically, the pole 31 includes a main body 35, an upper skirt 36 and a lower skirt 37. The upper skirt 36 and the lower skirt 37 are arranged on the peripheral side walls of the main body 35. The main body 35 is assembled in the pole hole 12. The main body 35 is used for conduction. The upper skirt 36 overlaps one side surface of the first step 14. The lower plastic 20 is fixed to the side of the top cover 10 away from the first step 14 through the lower skirt 37. The upper skirt 36, the main body 35, and the lower skirt 37 constitute a clamping cavity, and the clamping cavity clamps the top cover 10.

[0042] The pole assembly 30 also includes an upper plastic 34. The top cover 10 is surrounded by a first step 14 to form a second step 16. The second step 16 and the first step 14 are arranged on the top cover 10 to form a stepped structure. The upper plastic 34 is connected to the upper skirt 36 and overlaps the second step 16. The upper skirt 36 is connected to the top cover 10 through the upper plastic 34, so that the upper skirt 36 and the top cover 10 are insulated. In this embodiment, the second step 16 can partially reduce the thickness of the top cover 10, so that this part of the space can be used to accommodate the upper plastic 34, and the distance between the top surface of the upper plastic 34 and the top cover 10 is further reduced. The space above the top cover 10 occupied by the upper plastic 34 is reduced, and the single battery can be made larger, thereby improving the energy density of the battery pack.

[0043] The outer contour of the upper plastic 34 is polygonal, the outer contour of the first step 14 is polygonal, and the outer contour of the second step 16 is polygonal. The outer contours of the upper plastic 34, the first step 14, and the second step 16 are the same. The polygonal shape shown in the figure is a hexagon, and of course, it can also be a triangle, a quadrilateral, a pentagon, etc. The polygonal structural form can prevent the upper plastic 34 from shaking relative to the first step 14 or the second step 16, thereby improving the overall stability of the pole assembly 30.

[0044] The upper plastic 34 and the upper skirt 36 are connected by injection molding, which can be nano injection molding or ordinary injection molding. The injection molding connection method can better improve the connection strength and sealing of the upper plastic 34 and the upper skirt 36. In addition, it can also reduce additional parts to connect the upper plastic 34 and the upper skirt 36. The upper plastic 34 is injection molded on the side of the upper skirt 36. The upper plastic 34 is connected to the upper, side, and lower parts of the upper skirt 36 in sequence, so that the upper plastic 34 wraps the upper skirt 36 and isolates the electrical connection between the upper skirt 36 and the top cover 10. The upper skirt 36 is provided with a blind hole 38 or a through hole. The blind hole 38 does not penetrate the upper skirt 36, and the through hole penetrates the upper skirt 36. Part of the upper plastic 34 is accommodated in the blind hole 38 or the through hole, thereby improving the connection strength between the upper plastic 34 and the upper skirt 36. It is worth noting that in the manner of providing through holes in the upper plastic 34 , the upper plastic 34 can penetrate and connect the materials on the upper and lower sides of the upper skirt 36 to form a whole, thereby increasing the connection strength.

[0045] The pole assembly 30 also includes a sealing ring 33, which can be made of silicone or foam. The sealing ring 33 has a certain deformation ability, so as to achieve a sealing effect. The sealing ring 33 can be placed at the first step 14, and the pole 31 is clamped and fixed to the first step 14, so as to completely seal the first step 14. The sealing ring 33 can also be placed at the connection between the pole hole 12 and the pole 31, and the pole 31 presses and fixes the sealing ring 33.

[0046] The utility model further provides a battery pack, which comprises a box body and a plurality of single cells described in any one of the above embodiments, wherein the plurality of single cells are arranged in the box body.

[0047] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0048] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0049] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A single cell battery, characterized in that: include: A top cover (10) is provided with a pole hole (12); A lower plastic (20) connected to one side of the top cover (10); A pole assembly (30) fixedly mounted in the pole hole (12); an insulating film (40), the insulating film (40) being fixedly mounted on a side of the lower plastic (20) away from the top cover (10) through the pole assembly (30), the insulating film (40) being surrounded to form a receiving cavity (401); and The battery core (50) is fixedly arranged in the accommodating cavity (401) and is electrically connected to the pole assembly (30).

2. The single cell according to claim 1, characterized in that: The battery cell (50) comprises a battery cell body (52) and a tab (54), wherein the tab (54) is electrically connected to the battery cell body (52); The pole assembly (30) comprises a pole (31) and a busbar (32); the pole (31) is fixed in the pole hole (12); the insulating film (40) is fixed to a side of the lower plastic (20) away from the top cover (10) through the busbar (32); and the other side of the busbar (32) is electrically connected to the pole lug (54).

3. The single cell according to claim 2, characterized in that: The single cell further comprises an isolating sheet (60); the pole tab (54) is bent and electrically connected to the busbar (32) along its thickness direction; the isolating sheet (60) is arranged at the bend of the pole tab (54).

4. The single cell according to claim 3, characterized in that: The isolation sheet (60) comprises a first portion (61) and a second portion (63) which are integrally connected, the first portion (61) being arranged at the bending position of the pole ear (54), the first portion (61) being a multi-layer structure, and the second portion (63) being a single-layer structure.

5. The single cell according to claim 3, characterized in that: One of the isolation plate (60) and the lower plastic (20) is provided with a limiting protrusion, and the other of the isolation plate (60) and the lower plastic (20) is provided with a limiting groove (601), and the limiting protrusion and the limiting groove (601) cooperate to limit the movement of the isolation plate (60).

6. The single cell according to claim 1, characterized in that: The insulating film (40) comprises a side portion (41) and a top portion (42) which are connected in an integral manner, wherein the side portion (41) is arranged on the peripheral side of the top portion (42), and the top portion (42) is fixed to a side of the lower plastic (20) away from the top cover (10) through the pole assembly (30); the side portion (41) is bent into a plurality of portions on the peripheral side of the top portion (42), and the plurality of side portions (41) are connected to each other and are arranged together with the top portion (42) to form the accommodating cavity (401).

7. The single cell according to claim 1, characterized in that: The pole assembly (30) comprises a pole (31); the top cover (10) is arranged around the pole hole (12) and is sunken to form a first step (14); the pole (31) is assembled in the pole hole (12) and partially extends to the first step (14) and a side opposite to the first step (14); the lower plastic (20) is fixed to a side of the top cover (10) away from the first step (14) through the pole (31).

8. The single cell according to claim 7, characterized in that: The pole (31) comprises a main body (35), an upper skirt (36) and a lower skirt (37), wherein the upper skirt (36) and the lower skirt (37) are arranged on the peripheral side wall of the main body (35), the main body (35) is assembled in the pole hole (12), the upper skirt (36) overlaps a side surface of the first step (14), and the lower plastic (20) is fixed to a side of the top cover (10) away from the first step (14) through the lower skirt (37); The pole assembly (30) further comprises an upper plastic (34); the top cover (10) is arranged around the first step (14) to form a second step (16); the upper plastic (34) and the upper skirt (36) are connected and overlapped on the second step (16).

9. The single cell according to claim 8, characterized in that: The upper plastic (34) is injection molded on the peripheral side of the upper skirt (36); the upper skirt (36) is provided with a blind hole (38) or a through hole, and part of the upper plastic (34) is accommodated in the blind hole (38) or the through hole.

10. A battery pack, characterized in that: include: A box and a plurality of single cells according to any one of claims 1 to 9, wherein the plurality of single cells are arranged in the box.

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