Battery cell structure and battery

Abstract

The embodiment of the utility model provides a battery cell structure and a battery, and relates to the technical field of batteries. The battery cell structure comprises a pole, a sealing cover and a switching piece, the pole comprises a pole main body and a pole boss which are connected with each other, and the pole is provided with a liquid injection hole; the sealing cover is connected to the pole; the switching piece is welded with the pole column, and the switching piece is provided with a welding area. The projection of the welding area of the switching piece in the thickness direction of the pole is located in the projection area of the pole boss in the thickness direction of the pole, and the projection of the welding area in the thickness direction of the pole is not overlapped with the projection of the liquid injection hole in the thickness direction of the pole, so that the welding area of the switching piece avoids the liquid injection hole; therefore, when the adapter sheet is welded, the battery cell structure is not easy to be penetrated by welding, and the sealing performance of the battery can be further ensured.

Description

Technical Field

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

[0002] With the development of electronic products, higher requirements are placed on the safety performance of batteries in electrical devices such as Bluetooth headsets and electronic bracelets.

[0003] In the related art, a liquid injection hole is opened in the middle of the pole of the cylindrical battery. After the liquid is injected, an aluminum sheet is used as a sealing cover. The sealing cover is sealed by laser welding. After sealing, the adapter is connected using laser welding on the sealing cover.

[0004] However, when the adapter plate and the sealing cover are welded, the adapter plate and the sealing cover may be easily welded through, affecting the sealing of the battery. Utility Model Content

[0005] The embodiments of the present invention provide a cell structure and a battery to solve the problem that when an adapter plate and a sealing cover are welded, the adapter plate and the sealing cover are easily welded through, thereby affecting the sealing performance of the battery.

[0006] On the one hand, the present invention provides a battery cell structure, comprising

[0007] a housing, wherein the housing is provided with an opening;

[0008] A pole, the pole comprising a pole body and a pole boss connected to each other, the pole boss passing through the opening of the housing, and the pole being provided with a liquid injection hole passing through the pole body and the pole boss;

[0009] A sealing cover, the sealing cover is connected to the pole and blocks the liquid injection hole;

[0010] An adapter plate is welded to the pole, and the adapter plate is provided with a welding area, the projection of the welding area in the thickness direction of the pole is located within the projection area of the pole boss in the thickness direction of the pole, and the projection of the welding area in the thickness direction of the pole does not overlap with the projection of the injection hole in the thickness direction of the pole.

[0011] In a possible implementation manner, the adapter plate is provided with an avoidance portion, the sealing cover is located in the avoidance portion, and the sealing cover and the adapter plate are located in the same plane on one side of the pole.

[0012] In a possible implementation manner, the avoidance portion is an avoidance hole or an avoidance groove; and / or the welding area is an annular welding area.

[0013] In a possible embodiment, in the thickness direction of the pole, the area corresponding to the pole of the pole boss is a first area, the area corresponding to the pole of the sealing cover is a second area, and the area of the first area excluding the second area is a third area.

[0014] The welding area is located in the third area.

[0015] In a possible implementation manner, the area of the welding region is smaller than or equal to the area of the third region.

[0016] In a possible embodiment, the adapter plate includes a first adapter section and a second adapter section connected to each other, the avoidance portion is located in the first adapter section, the first adapter section is welded to the pole, and the second adapter section is partially arranged on one side of the side wall of the shell.

[0017] In a possible implementation manner, the sealing cover is provided with a limiting platform, and the limiting platform is stuck in the liquid injection hole.

[0018] In a possible implementation, the sealing cover has a first thickness, the pole boss has a second thickness, the first thickness is greater than 1 / 5 of the second thickness, and the first thickness is less than 4 / 5 of the second thickness.

[0019] In a possible implementation, the adapter sheet has a third thickness, which is greater than 1 / 5 of the second thickness and less than 4 / 5 of the second thickness.

[0020] In a possible implementation manner, the difference between the first thickness and the third thickness is 0.05-0.5 mm.

[0021] In a possible implementation manner, the diameter of the liquid injection hole is a first diameter, the diameter of the sealing cover is a second diameter, and the diameter of the pole boss is a third diameter;

[0022] The difference between the second diameter and the first diameter is greater than 0.5 mm; and / or the difference between the third diameter and the second diameter is greater than 1 mm.

[0023] In a possible implementation manner, the diameter of the liquid injection hole is 0.6-2 mm; and / or the diameter of the pole boss is 1-5 mm; and / or the thickness of the pole boss is 0.1-0.5 mm.

[0024] In a possible implementation manner, the sealing cover is connected to the pole body by welding, and the adapter piece is connected to the pole body by welding.

[0025] In a possible embodiment, a sealing film is further included, the housing includes a housing body and a connecting piece, the connecting piece is connected to the housing body, and the sealing film is bonded between the connecting piece and the pole body;

[0026] The sealing film is provided with a first through hole, the connecting piece is provided with an opening, the first through hole, the opening and the injection hole are coaxially arranged, and the diameters of the first through hole and the opening are both larger than the diameter of the pole boss.

[0027] In a possible implementation manner, the sealing cover is welded to the pole boss, the adapter plate is welded to the pole boss, and an insulating plate is provided between the adapter plate and the connecting plate.

[0028] In a possible implementation, in the height direction of the battery cell structure, the projection of the adapter sheet and the projection of the insulating sheet at least partially overlap, and the difference between the height of the pole boss and the height of the connecting sheet is greater than 0.05 mm.

[0029] In a possible implementation manner, the inner diameter of the insulating sheet is larger than the diameter of the avoidance portion.

[0030] On the other hand, an embodiment of the present invention provides a battery, including the battery cell structure as described above.

[0031] An embodiment of the present utility model provides a cell structure and a battery, in which the projection of the welding area of the adapter in the thickness direction of the pole is located within the projection area of the pole boss in the thickness direction of the pole, and the projection of the welding area in the thickness direction of the pole does not overlap with the projection of the injection hole in the thickness direction of the pole, so that the welding area of the adapter avoids the injection hole. Since the thickness of the sealing cover in the thickness direction of the pole is less than the thickness of the pole, the part where the pole boss is located is not easily welded through, so that when the adapter is welded, the cell structure is not easily welded through, thereby ensuring the sealing of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0033] Figure 1 A schematic structural diagram of a battery provided in Example 1 of the present utility model;

[0034] Figure 2 for Figure 1Schematic cross-section of the battery;

[0035] Figure 3 for Figure 1 A schematic cross-sectional view of a pole in FIG;

[0036] Figure 4 for Figure 1 A top view of the battery with the adapter removed;

[0037] Figure 5 A schematic cross-sectional view of a battery provided in Example 2 of the present utility model;

[0038] Figure 6 This is an exploded schematic diagram of a battery provided in Example 3 of the present utility model;

[0039] Figure 7 for Figure 6 Schematic cross-section of the battery;

[0040] Figure 8 for Figure 1 A schematic diagram of the structure of the adapter;

[0041] Figure 9 This is a structural schematic diagram of a battery provided in Example 4 of the present utility model.

[0042] Description of reference numerals:

[0043] 100-shell; 200-battery cell; 10-pole; 10a-first surface; 10b-second surface; 101-pole body; 102-pole boss; 103-liquid injection hole; 20-sealing cover; 201-limiting platform; 30-adapter; 30a-welding area; 30b-avoidance portion; 31-first adaptor section; 32-second adaptor section; 40-sealing film; 401-first through hole; 50-connecting piece; 501-opening; 60-insulating sheet; 601-second through hole. DETAILED DESCRIPTION

[0044] 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 only 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 ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0046] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0049] As described in the background art, when the adapter plate and the sealing cover are welded, the adapter plate and the sealing cover may be welded through, affecting the sealing performance of the battery. The inventors have discovered that the reason for this problem is that when the adapter plate and the sealing cover are welded, the projection of the welding area of the adapter plate in the thickness direction of the electrode overlaps with the projection of the injection hole in the thickness direction of the electrode. The thickness of the adapter plate is roughly equal to the thickness of the sealing cover, and the thickness of the sealing cover in the thickness direction of the electrode is less than the thickness of the electrode. When the adapter plate and the sealing cover are welded, the adapter plate and the sealing cover may be easily welded through, affecting the sealing performance of the battery.

[0050] In order to solve the above problems, an embodiment of the present invention provides a battery cell structure and a battery, in which the welding area of the adapter plate is avoided from the liquid injection hole, and since the thickness of the sealing cover in the thickness direction of the pole is less than the thickness of the pole, the part where the pole boss is located is not easily welded through, and the projection of the welding area of the adapter plate in the thickness direction of the pole is located within the projection area of the pole boss in the thickness direction of the pole, so that when the adapter plate is welded, the battery cell structure is not easily welded through, thereby ensuring the sealing of the battery.

[0051] The cell structure and battery provided by the embodiments of the present invention are described in detail below with reference to specific embodiments.

[0052] See also Figure 1 As shown, an embodiment of the present invention provides a cell structure for use in a battery. The height of the cell structure is in the Z-axis direction.

[0053] The battery cell structure includes a housing 100. The housing 100 is columnar. In some examples, the housing 100 is cylindrical.

[0054] See also Figure 1 and Figure 2 As shown, the housing 100 includes a housing body 100a and a connecting piece 50. The connecting piece 50 is welded to the housing body 100a so as to be sealed.

[0055] The connecting piece 50 is provided with an opening 501. The opening 501 is circular in shape.

[0056] The housing 100 accommodates the battery cell 200 .

[0057] See also Figure 1 and Figure 2 As shown, the battery cell structure includes a pole 10 , a sealing cover 20 and a transfer plate 30 .

[0058] At the height of the cell structure, the pole 10 is arranged on one side of the cell 200. Figure 3As shown, the pole 10 includes a pole body 101 and a pole boss 102 connected to each other. The pole boss 102 is located on one side of the pole body 101 in the thickness direction of the pole 10. The thickness direction of the pole 10 is the Z-axis direction.

[0059] The pole body 101 and the pole boss 102 may both be cylindrical in shape.

[0060] The pole boss 102 may be located on a side of the pole body 101 facing the battery cell 200 , and the pole boss 102 insulates and penetrates the opening 501 of the housing 100 .

[0061] The pole 10 is made of metal and is connected to the electrode of the battery cell 200 .

[0062] See also Figure 3 As shown, the pole 10 has a first surface 10 a and a second surface 10 b in parallel in the thickness direction. The first surface 10 a is located on the pole body 101 , and the second surface 10 b is located on the pole boss 102 .

[0063] The electrode 10 is provided with a liquid injection hole 103, which passes through the electrode body 101 and the electrode boss 102. The electrolyte can be injected into the housing 100 through the liquid injection hole 103.

[0064] The injection hole 103 is cylindrical in shape. The axis of the injection hole 103 extends along the thickness direction of the pole 10. In some examples, the axis of the injection hole 103, the axis of the pole body 101 and the axis of the pole boss 102 coincide with each other.

[0065] See also Figure 1 and Figure 2 As shown, the sealing cover 20 is made of metal and is connected to the pole 10. The sealing cover 20 is connected to the pole 10 by laser welding.

[0066] The sealing cover 20 blocks the liquid injection hole 103 to prevent the electrolyte in the housing 100 from leaking out of the liquid injection hole 103 .

[0067] The thickness of the sealing cover 20 in the thickness direction of the pole 10 is smaller than the thickness of the pole 10. The thickness of the pole 10 is equal to the sum of the thickness of the pole body 101 and the thickness of the pole boss 102.

[0068] See also Figure 1 and Figure 2 As shown, the material of the adapter plate 30 is metal. The adapter plate 30 can be straight or bent.

[0069] The adapter plate 30 can be welded to the pole 10. In other embodiments, the adapter plate 30 can also be welded to the sealing cover 20, or can also be welded to the pole 10 and the sealing cover 20.

[0070] exist Figure 4 FIG. 3 shows the welding area 30 a of the adapter 30 .

[0071] The welding region 30a of the adapter plate 30 can be welded to the pole 10. In other embodiments, the welding region 30a of the adapter plate 30 can also be welded to the sealing cover 20, or can also be welded to the pole 10 and the sealing cover 20.

[0072] The projection of the welding area 30a in the thickness direction of the pole 10 is located within the projection area of the pole boss 102 in the thickness direction of the pole 10. The projection of the welding area 30a in the thickness direction of the pole 10 does not overlap with the projection of the injection hole 103 in the thickness direction of the pole 10. This arrangement allows the welding area 30a of the adapter 30 to avoid the injection hole 103. Since the thickness of the sealing cover 20 in the thickness direction of the pole 10 is less than the thickness of the pole 10, the portion where the pole boss 102 is located is not easily welded through. Therefore, when welding the adapter 30, the battery cell structure is not easily welded through, thereby ensuring the sealing of the battery.

[0073] In a possible embodiment, the thickness of the sealing cover 20 is the thickness of the sealing cover 20 in the thickness direction of the first pole 10. Figure 2 As shown, the thickness of the sealing cover 20 is a first thickness H1.

[0074] The thickness of the pole boss 102 is the thickness of the pole boss 102 in the thickness direction of the first pole 10. Figure 3 As shown, the thickness of the pole boss 102 is the second thickness H2.

[0075] The thickness of the adapter plate 30 is equal to the thickness of the first adapter section 31. The thickness of the first adapter section 31 is the thickness of the first adapter section 31 in the thickness direction of the first pole 10. Figure 2 As shown, the thickness of the first transition section 31 is the third thickness H3.

[0076] The first thickness H1 is greater than 1 / 5 of the second thickness H2, and the first thickness H1 is less than 4 / 5 of the second thickness H2. In this way, the thickness of the sealing cover 20 can be less than the thickness of the terminal boss 102.

[0077] The third thickness H3 is greater than 1 / 5 of the second thickness H2 and less than 4 / 5 of the second thickness H2. In this way, the thickness of the adapter plate 30 can be smaller than the thickness of the pole boss 102.

[0078] In some examples, the second thickness H2 may be 0.1-0.5 mm, that is, the thickness of the pole boss 102 may be 0.1-0.5 mm.

[0079] Furthermore, the difference between the first thickness H1 and the third thickness H3 may be 0.05-0.5 mm.

[0080] In one possible implementation, see Figure 2 and Figure 3 As shown, the diameter of the liquid injection hole 103 is a first diameter D1.

[0081] The diameter of the sealing cap 20 is the second diameter D2.

[0082] The diameter of the pole boss 102 is a third diameter D3.

[0083] The difference between the second diameter D2 and the first diameter D1 can be greater than 0.5 mm. In this way, the diameter of the sealing cover 20 can be greater than the diameter of the liquid injection hole 103 , so that the sealing cover 20 can block the liquid injection hole 103 .

[0084] The difference between the third diameter D3 and the second diameter D2 can be greater than 1 mm. This configuration can make the projection area of the pole boss 102 in the thickness direction of the pole 10 larger than the projection area of the sealing cover 20 in the thickness direction of the pole 10.

[0085] In some examples, the first diameter D1 may be 0.6-2 mm, ie, the diameter of the injection hole 103 may be 0.6-2 mm. The third diameter D3 may be 1-5 mm, ie, the diameter of the pole boss 102 may be 1-5 mm.

[0086] In one possible implementation, see Figure 2 As shown, the battery cell structure further includes a sealing film 40 .

[0087] The sealing film 40 is made of an insulating material. The connecting piece 50 is located on the side of the pole body 101 facing the pole boss 102, and the sealing film 40 is bonded between the connecting piece 50 and the pole body 101. This arrangement allows the sealing film 40 to be sealed between the connecting piece 50 and the pole body 101, thereby sealing the opening 501 of the housing 100.

[0088] The sealing film 40 is provided with a first through hole 401. The first through hole 401 is circular in shape.

[0089] The connecting piece 50 is made of metal.

[0090] The first through hole 401, the opening 501, and the liquid injection hole 103 are coaxially arranged. In some examples, the diameter of the first through hole 401 and the diameter of the opening 501 are both larger than the diameter of the pole boss 102. This arrangement allows the pole boss 102 to be located in the first through hole 401 and the opening 501.

[0091] In one possible implementation, see Figure 2 As shown, the pole boss 102 is located on the side of the pole body 101 facing the battery cell 200 .

[0092] The surface of the terminal body 101 away from the bottom of the battery is the first surface 10a . The first surface 10a is perpendicular to the axis of the liquid injection hole 103 .

[0093] The sealing cover 20 and the adapter plate 30 are located on the first surface 10 a . It can be understood that the sealing cover 20 and the adapter plate 30 are located on the same plane.

[0094] The sealing film 40 and the connecting piece 50 are located on the side of the electrode body 101 facing the battery cell 200 .

[0095] Further, see Figure 5 As shown, the sealing cover 20 is provided with a limiting platform 201 , which can be inserted into the liquid injection hole 103 . The limiting platform 201 is clamped in the liquid injection hole 103 , that is, the sealing cover 20 is clamped with the liquid injection hole 103 .

[0096] The position of the sealing cover 20 on the pole 10 can be limited by the limiting platform 201, so that the sealing cover 20 can be positioned easily when welding the sealing cover 20.

[0097] In another possible embodiment, see Figure 6 and Figure 7 As shown, the pole boss 102 is located on the pole body 101 (see Figure 3 ) is the side facing away from the battery cell 200.

[0098] The height direction of the battery cell structure is parallel to the thickness direction of the pole 10 .

[0099] The sealing film 40 and the connecting piece 50 are located on a side of the pole body 101 away from the battery cell 200 , that is, the sealing film 40 and the connecting piece 50 are located on a side of the pole body 101 in the +Z axis direction.

[0100] The surface of the terminal boss 102 away from the bottom of the battery is the second surface 10 b . The second surface 10 b is perpendicular to the axis of the liquid injection hole 103 .

[0101] The sealing cover 20 and the adapter plate 30 are located on the second surface 10 b . It can be understood that the sealing cover 20 and the adapter plate 30 are located on the same plane.

[0102] The sealing cover 20 is welded to the pole boss 102 , and the adapter plate 30 is welded to the pole boss 102 .

[0103] Further, see Figure 6 and Figure 7As shown, an insulating sheet 60 is provided between the adapter sheet 30 and the connecting sheet 50. This arrangement can prevent the adapter sheet 30 from contacting the connecting sheet 50.

[0104] The insulating sheet 60 is made of insulating material. In some examples, the insulating sheet 60 is bonded between the adapter sheet 30 and the connecting sheet 50 .

[0105] In the height direction of the battery cell structure, the projection of the adapter sheet 30 and the projection of the insulating sheet 60 at least partially overlap.

[0106] The insulating sheet 60 has a second through hole 601. The second through hole 601 is circular in shape.

[0107] The diameter of the second through hole 601 is larger than the diameter of the pole boss 102. With this arrangement, the pole boss 102 can be located in the second through hole 601.

[0108] The inner diameter of the insulating sheet 60 is larger than the diameter of the avoidance portion 30b, that is, the diameter of the second through hole 601 of the insulating sheet 60 is larger than the diameter of the avoidance portion 30b.

[0109] In the height direction of the battery cell structure, the height of the second surface 10 b is higher than the height of the surface of the connecting piece 50 away from the bottom of the battery.

[0110] The height of the second surface 10b is the height of the second surface 10b relative to the bottom of the battery in the height direction of the battery cell structure.

[0111] The height of the surface of the connecting piece 50 away from the bottom of the battery is the height of the surface relative to the bottom of the battery in the height direction of the battery cell structure.

[0112] For some examples, see Figure 6 and Figure 7 As shown, the difference between the height of the terminal boss 102 and the height of the connecting piece 50 in the height direction of the battery cell structure is greater than 0.05 mm. That is, in the height direction of the battery cell structure, the height of the second surface 10b is 0.05 mm greater than the height of the surface of the connecting piece 50 away from the bottom of the battery. This arrangement creates a gap between the adapter piece 30 and the connecting piece 50, allowing the insulating sheet 60 to be placed between the adapter piece 30 and the connecting piece 50.

[0113] In one possible implementation, see Figure 2 and 5 As shown, the adapter plate 30 is provided with an avoidance portion 30b, and the sealing cover 20 is located in the avoidance portion 30b.

[0114] The sealing cover 20 and the adapter plate 30 are located in the same plane on one side of the pole 10 , that is, the sealing cover 20 and the adapter plate 30 are located on the first surface 10 a .

[0115] The sealing cover 20 is welded to the pole body 101, and the adapter 30 is welded to the pole body 101. Figure 6 and Figure 7 As shown, when the sealing cover 20 and the adapter plate 30 are located on the second surface 10 b , the sealing cover 20 is welded to the pole boss 102 , and the adapter plate 30 is connected to the pole boss 102 .

[0116] Further, see Figure 4 As shown, the welding area 30 a of the adapter plate 30 is in contact with the pole 10 , but not in contact with the sealing cover 20 .

[0117] In the thickness direction of the pole 10, the area corresponding to the pole boss 102 on the pole 10 is the first area, the area corresponding to the sealing cover 20 on the pole 10 is the second area, and the area excluding the second area in the first area is the third area S (see Figure 2 The welding area 30a is located in the third area S.

[0118] The area of the welding region 30 a is smaller than or equal to the area of the third region S.

[0119] The adapter plate 30 is formed by stamping. Figure 8 As shown, the adapter plate 30 includes a first adapter section 31 and a second adapter section 32 connected to each other.

[0120] The first transition section 31 is straight and is welded to the pole body 101 .

[0121] The avoidance portion 30b is located within the first transition section 31. The avoidance portion 30b can be a avoidance hole extending through the first transition section 31. In some examples, the avoidance hole is a circular hole, the first transition section 31 is cylindrical, and the welding area 30a is an annular welding area. The area of the annular welding area is equal to the area of the third region S.

[0122] The second transition section 32 is bent and partially disposed on one side of the side wall of the housing 100 .

[0123] In other embodiments, see Figure 9 As shown, the avoidance portion 30b can be a avoidance groove extending through the first transition section 31. In some examples, the avoidance groove is a semicircular groove. The first transition section 31 is semi-cylindrical in shape, and the welding area 30a is a semi-annular welding area. The area of the semi-annular welding area is equal to half the area of the third area S.

[0124] An embodiment of the present utility model provides a battery, including a battery core structure.

[0125] Among them, the battery cell structure in this embodiment is the same as the battery cell structure provided in any of the above embodiments, and can bring the same or similar technical effects. They will not be described one by one here, and the details can be referred to the description of the above embodiments.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cell structure, characterized in that: include: A housing (100), wherein the housing (100) is provided with an opening (501); A pole (10), the pole (10) comprising a pole body (101) and a pole boss (102) connected to each other, the pole boss (102) passing through an opening (501) of the housing (100), the pole (10) being provided with a liquid injection hole (103), the liquid injection hole (103) passing through the pole body (101) and the pole boss (102); A sealing cover (20), the sealing cover (20) being connected to the pole (10), and the sealing cover (20) blocking the liquid injection hole (103); An adapter plate (30) is welded to the pole (10), and the adapter plate (30) is provided with a welding area (30a). The projection of the welding area (30a) in the thickness direction of the pole (10) is located within the projection area of the pole boss (102) in the thickness direction of the pole (10), and the projection of the welding area (30a) in the thickness direction of the pole (10) does not overlap with the projection of the injection hole (103) in the thickness direction of the pole.

2. The battery cell structure according to claim 1, characterized in that: The adapter plate (30) is provided with an escape portion (30b), the sealing cover (20) is located in the escape portion (30b), and the sealing cover (20) and the adapter plate (30) are located in the same plane on one side of the pole (10).

3. The battery core structure according to claim 2, characterized in that: The avoidance portion (30b) is an avoidance hole or an avoidance groove; and / or the welding area (30a) is an annular welding area.

4. The battery core structure according to claim 3, characterized in that: In the thickness direction of the pole, the area corresponding to the pole boss (102) on the pole (10) is a first area, the area corresponding to the sealing cover (20) on the pole (10) is a second area, and the area of the first area excluding the second area is a third area; The welding area (30a) is located in the third area.

5. The battery core structure according to claim 4, characterized in that: The area of the welding region (30a) is smaller than or equal to the area of the third region.

6. The battery core structure according to claim 2, characterized in that: The adapter plate (30) comprises a first adapter section (31) and a second adapter section (32) connected to each other, the avoidance portion (30b) is located in the first adapter section (31), the first adapter section (31) is welded to the pole (10), and the second adapter section (32) is partially arranged on one side of the side wall of the housing (100).

7. The battery core structure according to claim 2, characterized in that: The sealing cover (20) is provided with a limiting platform (201), and the limiting platform (201) is stuck in the liquid injection hole (103).

8. The battery core structure according to any one of claims 1 to 7, characterized in that: The thickness of the sealing cover (20) is a first thickness, the thickness of the pole boss (102) is a second thickness, the first thickness is greater than 1 / 5 of the second thickness, and the first thickness is less than 4 / 5 of the second thickness.

9. The battery core structure according to claim 8, characterized in that: The thickness of the adapter plate (30) is a third thickness, the third thickness is greater than 1 / 5 of the second thickness, and the third thickness is less than 4 / 5 of the second thickness.

10. The battery core structure according to claim 9, characterized in that: The difference between the first thickness and the third thickness is 0.05-0.5 mm.

11. The battery core structure according to any one of claims 1 to 7, characterized in that: The diameter of the liquid injection hole (103) is a first diameter, the diameter of the sealing cover (20) is a second diameter, and the diameter of the pole boss (102) is a third diameter; The difference between the second diameter and the first diameter is greater than 0.5 mm; and / or the difference between the third diameter and the second diameter is greater than 1 mm.

12. The battery core structure according to any one of claims 1 to 7, characterized in that: The diameter of the injection hole is 0.6-2 mm; and / or the diameter of the pole boss (102) is 1-5 mm; and / or the thickness of the pole boss (102) is 0.1-0.5 mm.

13. The battery core structure according to any one of claims 1 to 7, characterized in that: The sealing cover (20) is welded to the pole body (101), and the adapter plate (30) is welded to the pole body (101).

14. The battery core structure according to any one of claims 2 to 7, characterized in that: The housing (100) further comprises a sealing film (40), the housing (100) comprising a housing body (100a) and a connecting piece (50), the connecting piece (50) being connected to the housing body (100a), and the sealing film (40) being bonded between the connecting piece (50) and the pole body (101); The sealing film (40) is provided with a first through hole (401), and the connecting piece (50) is provided with an opening (501). The first through hole (401), the opening (501) and the injection hole (103) are coaxially arranged. The diameters of the first through hole (401) and the opening (501) are both larger than the diameter of the pole boss (102).

15. The battery core structure according to claim 14, characterized in that: The sealing cover (20) is welded to the pole boss (102), the adapter plate (30) is welded to the pole boss (102), and an insulating plate (60) is provided between the adapter plate (30) and the connecting plate (50).

16. The battery core structure according to claim 15, characterized in that: In the height direction of the battery core structure, the projection of the adapter sheet (30) and the projection of the insulating sheet (60) at least partially overlap, and the difference between the height of the pole boss (102) and the height of the connecting sheet (50) is greater than 0.05 mm.

17. The battery core structure according to claim 15, characterized in that: The inner diameter of the insulating sheet (60) is larger than the diameter of the avoidance portion (30b).

18. A battery, characterized in that: Comprising the battery core structure according to any one of claims 1 to 17.

Images