battery

Abstract

The application provides a battery, comprising: a shell, which surrounds a cavity; the shell comprises a first side plate, the first side plate is provided with a first through hole which communicates with the cavity; an electric core, which is located in the cavity; the electric core is provided with a first tab; a first adapter, which is electrically connected with the first tab; the first adapter is arranged between the first side plate and the electric core, the first adapter is provided with a second through hole, the first adapter is connected with the first side plate, and the first through hole and the second through hole at least partially overlap on the first side plate. The application can improve the sealing performance and safety performance of the battery.

Description

Technical Field

[0001] This invention relates to the field of electrochemical energy storage devices, and more specifically to a battery. Background Technology

[0002] Currently, electrochemical devices, represented by batteries, are widely used. For example, lithium-ion batteries have advantages such as large capacity, small size, light weight, and environmental friendliness, and are widely used in industries such as digital electronics and electric vehicles. With technological advancements, the requirements for battery performance, such as sealing and safety, are becoming increasingly stringent. Therefore, there is an urgent need to improve the sealing and safety performance of batteries. Summary of the Invention

[0003] This invention provides a battery with good sealing and safety properties.

[0004] The present invention provides a battery, comprising: a casing forming a cavity; the casing including a first side plate having a first through hole communicating with the cavity; a battery cell located within the cavity; the battery cell having a first tab; a first adapter electrically connected to the first tab; the first adapter being disposed between the first side plate and the battery cell, the first adapter having a second through hole, the first adapter being connected to the first side plate, and the projections of the first through hole and the second through hole on the first side plate at least partially overlapping.

[0005] According to one embodiment of the present invention, one of the projections of the first through hole and the second through hole on the first side plate covers the other; and / or, the concentricity of the first through hole and the second through hole is less than or equal to 1.5 mm.

[0006] According to one embodiment of the present invention, the first through hole and the second through hole are coaxially arranged.

[0007] According to one embodiment of the present invention, the projection of the first adapter on the first side plate does not overlap with the projection of the first electrode on the first side plate.

[0008] According to one embodiment of the present invention, the housing further includes a second side plate connected to the first side plate, wherein the projection of the first adapter on the second side plate at least partially overlaps with the projection of the first tab on the second side plate.

[0009] According to one embodiment of the present invention, the battery further includes a first connecting member located between the cell and the first side plate, the first connecting member being connected to the first tab and the first adapter respectively.

[0010] According to one embodiment of the present invention, the first connector includes a first connecting piece connected to the first adapter and a fourth connecting piece connected to the side of the first electrode opposite to the battery cell.

[0011] According to one embodiment of the present invention, the first connector further includes a connecting component that is connected to the first connecting piece and the fourth connecting piece respectively; the connecting component includes a second connecting piece and a third connecting piece; the second connecting piece is located between the first adapter and the battery cell; in the direction from the first adapter to the first electrode tab, the third connecting piece is located between the first electrode tab and the first adapter; the first connecting piece, the second connecting piece, the third connecting piece, and the fourth connecting piece are connected in sequence.

[0012] According to one embodiment of the present invention, the first connecting piece includes a first connecting portion connected to the first adapter and a second connecting portion extending along the extending direction of the first side plate, the second connecting portion being connected to the fourth connecting piece.

[0013] According to one embodiment of the present invention, a sixth insulating layer is further provided on the side of the first connecting piece facing away from the first adapter; and / or, a first included angle is formed between the side of the first adapter that is in contact with the first connecting piece and the side of the fourth connecting piece that is in contact with the first electrode tab, the first included angle being in the range of 80-120°; and / or, the first connecting piece is welded to the first adapter; and / or, the battery cell includes a plurality of stacked electrode sheets, the side of the first connecting piece that is in contact with the first adapter and the surface of the electrode sheets being parallel; and / or, a second included angle is formed between the side of the first adapter that is in contact with the first side plate and the side of the first adapter that is in contact with the first connecting piece, the second included angle being in the range of 80-120°; and / or, there is an overlap area between the projection of the first adapter in the thickness direction of the battery cell and the projection of the first connecting piece in the thickness direction of the battery cell.

[0014] According to one embodiment of the present invention, the first adapter is provided with a third groove on the side opposite to the first side plate, and the third groove is connected to the second through hole and the cavity respectively.

[0015] According to one embodiment of the present invention, the cross-section of the third groove parallel to the direction from the side of the first adapter facing the first side plate to the side of the first adapter away from the first side plate is arc-shaped; and / or, the minimum thickness of the first adapter in the direction from the first side plate to the first adapter is 0.2 mm to 1 mm; and / or, the minimum thickness of the first adapter in the thickness direction of the battery cell is 0.2 mm to 1 mm.

[0016] According to one embodiment of the present invention, the first adapter includes a first adapter portion and a second adapter portion surrounding the third groove, the first adapter portion having a second through hole and being connected to the first side plate; the battery further includes a first connector, the first connector being connected to the first tab and the second adapter portion respectively; one or more reinforcing ribs are provided between the second adapter portion and the first adapter portion.

[0017] According to one embodiment of the present invention, the contact portion between the second transition portion and the first transition portion has a reinforcing area corresponding to the position of the reinforcing rib, the reinforcing area being recessed towards the angle between the second transition portion and the first transition portion to form the reinforcing rib; and / or, the angle between the line connecting the end of the reinforcing rib that is in contact with the first transition portion and the end of the reinforcing rib that is in contact with the second transition portion and the surface of the first transition portion is 30° to 60°; and / or, the angle between the line connecting the end of the reinforcing rib that is in contact with the first transition portion and the end of the reinforcing rib that is in contact with the second transition portion and the surface of the second transition portion is 30° to 60°.

[0018] According to one embodiment of the present invention, the first adapter further includes a third adapter connected to the first adapter portion, wherein the third adapter portion and the second adapter portion are respectively located on opposite sides of the first adapter portion.

[0019] According to one embodiment of the present invention, a third insulating layer is further included, the third insulating layer being located between the first connector and the first side plate.

[0020] According to one embodiment of the present invention, the first connector includes a fourth connecting piece connected to the side of the first tab opposite to the battery cell, and the third insulating layer includes a first portion located on the side of the fourth connecting piece opposite to the first tab.

[0021] According to one embodiment of the present invention, the battery cell includes a plurality of stacked electrode sheets; the battery cell has a first surface and a second surface disposed opposite to each other; the third insulating layer further includes a second portion extending from one end of the first portion near the first surface of the battery cell toward the direction of proximity to the battery cell, and a third portion extending from one end of the first portion near the second surface of the battery cell toward the direction of proximity to the battery cell.

[0022] According to one embodiment of the present invention, the projection of the first electrode in the thickness direction of the battery cell is located within the projection of the second portion of the third insulating layer in the thickness direction of the battery cell, and / or, the projection of the first electrode in the thickness direction of the battery cell is located within the projection of the third portion of the third insulating layer in the thickness direction of the battery cell; and / or, the projection of the first electrode in the length direction of the battery cell is located within the projection of the first portion of the third insulating layer in the length direction of the battery cell.

[0023] According to one embodiment of the present invention, a second portion of the third insulating layer extends to a first surface of the battery cell and is bonded to an electrode sheet located on the first surface of the battery cell; and / or, a third portion of the third insulating layer extends to a second surface of the battery cell and is bonded to an electrode sheet located on the second surface of the battery cell.

[0024] According to one embodiment of the present invention, a second insulating layer is provided between the first adapter and the battery cell.

[0025] According to one embodiment of the present invention, the battery includes a plurality of stacked electrode sheets, and the battery cell has a first side and a second side disposed opposite to each other, wherein a second insulating layer extends to the first side of the battery cell and is bonded to the electrode sheets located on the first side of the battery cell, and / or the second insulating layer extends to the second side of the battery cell and is bonded to the electrode sheets located on the second side of the battery cell.

[0026] According to one embodiment of the present invention, the end face of the battery cell on the side where the first tab is provided is parallel to the thickness direction of the battery cell; and / or, the distance from the side of the first tab away from the battery cell to the side where the first tab is connected to the battery cell is not greater than the length of the first adapter in the direction from the first side plate to the first tab; and / or, the length of the first adapter in the direction from the first side plate to the first tab is 1mm-4mm; and / or, the first adapter is welded to the first side plate.

[0027] According to one embodiment of the present invention, the battery cell is further provided with a second tab, the second tab having a polarity opposite to that of the first tab; the battery further includes a second adapter, the second adapter being electrically connected to the second tab, the second adapter being disposed between the first side plate and the battery cell, and the projection of the second adapter on the first side plate not overlapping the projection of the second tab on the first side plate.

[0028] According to one embodiment of the present invention, the housing includes a second side plate connected to the first side plate; the projection of the first electrode tab on the second side plate at least partially overlaps with the projection of the second electrode tab on the second side plate; and / or, the projection of the second adapter on the second side plate at least partially overlaps with the projection of the second electrode tab on the second side plate; and / or, the projection of the first adapter on the second side plate at least partially overlaps with the projection of the second adapter on the second side plate.

[0029] According to one embodiment of the present invention, the first tab and the second tab are located between the first adapter and the second adapter; and / or, the distance from the side of the second tab away from the battery cell to the side of the second tab connected to the battery cell is not greater than the length of the second adapter along the direction from the first side plate to the second tab; and / or, the length of the second adapter along the direction from the first side plate to the second tab is 1mm-3mm; and / or, the length of the second adapter along the direction from the first side plate to the second tab is less than the length of the first adapter.

[0030] According to one embodiment of the present invention, the first tab is a negative tab or a positive tab; and / or, the battery cell includes a laminated battery cell or a wound battery cell.

[0031] In this invention, the first through hole serves as an injection hole for injecting electrolyte into the cavity. The first side plate with the first through hole is connected to the first adapter part of the first adapter, and the first through hole and the second through hole overlap at least partially. The first through hole communicates with the cavity through the second through hole to realize electrolyte injection. At the same time, the first adapter part can support the part of the first side plate surrounding the first through hole (i.e., the side wall of the first through hole), preventing the part of the first side plate surrounding the first through hole from deforming during processes such as sealing and welding of the injection hole. For example, it facilitates sealing and welding of the injection hole, improves the sealing performance of the injection hole after welding, and thus improves the sealing performance and safety of the battery. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a battery structure according to an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the connection structure between the first adapter, the first connector, and the housing according to an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of the connection structure between the first adapter, the first connector, and the housing according to an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of the connection structure between the first adapter and the housing according to an embodiment of the present invention;

[0036] Figure 5 A schematic diagram of the connection structure between the first adapter and the housing according to an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure of the first adapter according to an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the first adapter according to an embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the structure of the first adapter according to an embodiment of the present invention;

[0040] Figure 9 This is a cross-sectional schematic diagram of the first adapter according to an embodiment of the present invention;

[0041] Figure 10 This is a cross-sectional schematic diagram of the first adapter according to an embodiment of the present invention;

[0042] Figure 11 This is a schematic diagram of the structure of the first adapter according to an embodiment of the present invention;

[0043] Figure 12 This is a schematic diagram of the connection structure between the second adapter and the housing according to an embodiment of the present invention;

[0044] Figure 13 This is a schematic diagram of the connection structure between the second adapter and the housing according to an embodiment of the present invention;

[0045] Figure 14 This is a schematic diagram of the structure of the second insulating sheet according to an embodiment of the present invention;

[0046] Figure 15 This is a schematic diagram of a battery cell packaging structure according to an embodiment of the present invention;

[0047] Figure 16 This is a schematic diagram of a battery cell packaging structure according to an embodiment of the present invention.

[0048] Explanation of reference numerals in the attached drawings: 1: Housing; 11: First side plate; 12: Second side plate; 13: Third side plate; 14: Fourth side plate; 15: Fifth side plate; 16: Sixth side plate; 17: Arc transition section; 100: First through hole; 151: Thinned section; 110: Fifth through hole; 2: Battery cell; 21: First electrode tab; 22: Second electrode tab; 31: First adapter; 300: Third groove; 310: Second through hole; 311: First adapter section; 312: Second adapter section; 313: Third adapter section; 314: Reinforcing area; 315: Reinforcing rib; 32: Second adapter section; 320: Third through hole; 41: External connector; 42: Terminal post; 43: Extension section; 5: First connector; 5': Second connector; 5 1: First connecting piece; 52: Second connecting piece; 53: Third connecting piece; 54: Fourth connecting piece; 55: Fifth connecting piece; 56: Sixth connecting piece; 57: Seventh connecting piece; 58: Eighth connecting piece; 511: First connecting part; 512: Second connecting part; 551: Third connecting part; 552: Fourth connecting part; 6: First insulating piece; 60: Sixth through hole; 7: Second insulating piece; 70: Fourth through hole; 71: First insulating part; 72: Second insulating part; 81: First insulating layer; 82: Second insulating layer; 83: Third insulating layer; 84: Fourth insulating layer; 85: Fifth insulating layer; 86: Sixth insulating layer; 9: Protective adhesive layer; 90: Seventh through hole; α1: Fifth included angle; α2: Sixth included angle. Detailed Implementation

[0049] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below. The specific embodiments listed below are merely descriptions of the principles and features of the present invention, and the examples are only for explaining the present invention and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," "connect," "interlock," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or communication connections (network connections); they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meanings of the above within the context of this invention. Furthermore, terms such as "first," "second," "third," "fourth," "fifth," "sixth," "seventh," and "eighth" are used for descriptive purposes only, such as distinguishing components to more clearly illustrate / explain the technical solution, and should not be construed as indicating or implying the quantity or order of the indicated technical features. Additionally, terms such as "parallel," "perpendicular," and "equal" are approximate states, and the numerical values ​​and ranges involved are approximate. Due to the influence of specific operational processes such as measurement and manufacturing, there may be a certain range of errors, which those skilled in the art can consider negligible.

[0051] Batteries are commonly used electrochemical energy storage devices. They generally include a casing, a battery cell encapsulated within a cavity formed by the casing, and an electrolyte injected into the cavity. The casing has an injection hole for injecting the electrolyte into the cavity. After injection, the injection hole is sealed, usually by welding a sealing strip to the casing around the injection hole to achieve a seal. However, during the process of welding the sealing strip to seal the injection hole, the casing around the injection hole is prone to deformation, leading to a decrease in sealing performance.

[0052] To address the above problems, embodiments of the present invention provide a battery, such as... Figures 1 to 16 As shown, the battery includes: a housing 1, which is arranged to form a cavity; the housing 1 includes a first side plate 11, the first side plate 11 having a first through hole 100 communicating with the cavity; a battery cell 2, located inside the cavity; the battery cell 2 having a first electrode tab 21; a first adapter 31, electrically connected to the first electrode tab 21; the first adapter 31 is disposed between the first side plate 11 and the battery cell 2, the first adapter 31 having a second through hole 310, the first adapter 31 being connected to the first side plate 11, and the projections of the first through hole 100 and the second through hole 310 on the first side plate 11 at least partially overlapping (i.e., the projection of the first through hole 100 parallel to the extension direction of the first side plate 11 and the projection of the second through hole 310 parallel to the extension direction of the first side plate 11 at least partially overlapping).

[0053] The first through hole 100 provided on the first side plate 11 can serve as an injection hole, connecting the first side plate 11 to the first adapter 311, and at least partially overlapping the first through hole 100 with the second through hole 310. The first through hole 100 communicates with the cavity through the second through hole 310 for injection. At the same time, the first adapter 31 connects with the part of the first side plate 11 surrounding the first through hole 100 (i.e., the shell 1 part around the injection hole), so that the first adapter 31 supports the part of the first side plate 11 surrounding the first through hole 100, preventing the part of the first side plate 11 surrounding the first through hole 100 from deforming during the sealing and welding of the injection hole, thereby facilitating the welding of the sealing sheet and improving the sealing performance after the injection hole is sealed.

[0054] Specifically, the radius of the projection of the first through hole 100 onto the first side plate 11 is r1, the radius of the projection of the second through hole 310 onto the first side plate 11 is r2, and the distance L between the center of the projection of the first through hole 100 onto the first side plate 11 and the circle of the projection of the second through hole 310 onto the first side plate 11 is L < r1 + r2. Where r1 ≥ r2, or r1 ≤ r2.

[0055] The projections of the first through hole 100 on the first side plate 11 and the second through hole 310 on the first side plate 11 may partially overlap or completely overlap. Specifically, the case of complete overlap may include: one of the projections of the first through hole 100 on the first side plate 11 and the second through hole 310 on the first side plate 11 covering the other, that is, the projection of the first through hole 100 on the first side plate 11 covers the projection of the second through hole 310 on the first side plate 11, or the projection of the second through hole 310 on the first side plate 11 covers the projection of the first through hole 100 on the first side plate 11.

[0056] For example, the radius (or area) of the projection of the second through hole 310 on the first side plate 11 is smaller than the projection of the first through hole 100 on the first side plate 11, and the projection of the second through hole 310 on the first side plate 11 is located within the projection of the first through hole 100 on the first side plate 11; or, the radius (or area) of the projection of the first through hole 100 on the first side plate 11 is smaller than the projection of the second through hole 310 on the first side plate 11, and the projection of the first through hole 100 on the first side plate 11 is located within the projection of the second through hole 310 on the first side plate 11; or, the projection of the first through hole 100 on the first side plate 11 coincides with the projection of the second through hole 310 on the first side plate 11 (they are coaxially arranged, and r1 = r2).

[0057] In some preferred embodiments, the concentricity of the first through hole 100 and the second through hole 310 is less than or equal to 1.5 mm, that is, the distance between the center of the projection of the first through hole 100 on the first side plate 11 and the center of the projection of the second through hole 310 on the first side plate 11 is less than or equal to 1.5 mm. More preferably, the first through hole 100 and the second through hole 310 are coaxially arranged, that is, their concentricity is 0.

[0058] In addition, the first electrode 21 can be electrically connected to the first side plate 11 (housing 1) through the first adapter 31, and the first adapter 31 and the first side plate 11 can be welded together.

[0059] The battery may also include a first connecting member 5 located between the cell 2 and the first side plate 11. The first connecting member 5 is connected to the first tab 21 and the first adapter 31 respectively (that is, the first adapter 31 is connected to the first tab 21 through the first connecting member). Specifically, the first adapter 31, the first connecting member 5, and the first tab 21 may be welded in sequence.

[0060] Specifically, the first connecting member 5 may include a first connecting piece 51 connected to the first adapter 31 and a fourth connecting piece 54 connected to the side of the first electrode 21 facing away from the battery cell 2.

[0061] like Figures 1 to 3 , Figure 15 and Figure 16 As shown, the first connecting member may have a bent structure. The first connecting piece 51 is connected to the first adapter 31, and the fourth connecting piece 54 is connected to the first electrode 21. Specifically, it may be welded. A first included angle is formed between the side of the first adapter 31 connected to the first connecting piece 51 and the side of the fourth connecting piece 54 connected to the first electrode 21. The range of the first included angle is 80-120°, such as 80°, 90°, 100°, 110°, 120°, etc. That is, the side of the first adapter 31 connected to the first connecting piece 51 and the side of the fourth connecting piece 54 connected to the first electrode 21 are not parallel, for example, they may be perpendicular. Therefore, by staggering the contact surfaces of the first adapter 31 and the first connecting piece 51 and the fourth connecting piece 54 and the first tab 21, and arranging these two contact surfaces basically along the width direction of the battery cell, not only can the space occupied by the first adapter 31 and the first connecting piece 51 in the cavity be reduced, but also the connection between the first adapter 31 and the first connecting piece 51 and the connection between the fourth connecting piece 54 and the first tab 21 can be made independent of each other. Furthermore, the stability of the connection between the first adapter 31 and the first tab 21 through the first connector can be improved, thereby improving the stability, safety and service life of the battery.

[0062] Furthermore, a second included angle is formed between the side of the first adapter 31 that contacts the first connecting piece 51 and the side of the first adapter 31 that contacts the first side plate 11 (the side of the first adapter 31 facing the first side plate 11). The range of the second included angle is 80-120°, for example, 80°, 90°, 100°, 110°, 120°, that is, the two are not parallel, for example, they can be perpendicular.

[0063] In addition, the battery cell 2 includes multiple stacked electrode sheets, and the side of the first connecting piece 51 that is in contact with the first adapter 31 can be parallel to the surface of the electrode sheet.

[0064] In some embodiments, such as Figures 1 to 3 As shown, the first connector also includes a first connecting assembly connected to the first connecting piece 51 and the fourth connecting piece 54 respectively. The first connecting assembly includes a second connecting piece 52 and a third connecting piece 53. The second connecting piece 52 is located between the first adapter 31 and the battery cell 2. In the direction from the first adapter 31 to the first electrode 21, the third connecting piece 53 is located between the first adapter 31 and the first electrode 21. The first connecting piece 51, the second connecting piece 52, the third connecting piece 53, and the fourth connecting piece 54 are connected in sequence.

[0065] Specifically, the first connector has a multi-bending structure. Its first connecting piece 51 is connected to the fourth connecting piece 54 in sequence through the second connecting piece 52 and the third connecting piece 53. The surface of the first connecting piece 51 is not parallel to the surface of the second connecting piece 52, for example, it is perpendicular. The surface of the second connecting piece 52 is not parallel to the surface of the third connecting piece 53, it can be perpendicular or not perpendicular. The surface of the fourth connecting piece 54 can be parallel to the surface of the second connecting piece 52. Thus, by setting the first connecting piece 51, the second connecting piece 52, the third connecting piece 53 and the fourth connecting piece 54 with multiple bends, the first connector can be prevented from swaying in the left-right direction and the front-back direction, and the stability of the connection between the first adapter 31 and the first electrode 21 can be further improved.

[0066] In other embodiments, such as Figure 15 As shown, the first connecting piece 51 includes a first connecting portion 511 connected to the first adapter 31, and a second connecting portion 512 extending along the extension direction of the first side plate 11 (such as the direction from the first adapter 31 to the first tab 21). The second connecting portion 512 is connected to the fourth connecting piece 54.

[0067] The first connecting portion 511 and the second connecting portion 512 are located on the same side of the first adapter 31 and the same side of the first electrode tab 21. Specifically, the first connecting portion 511 can be located on the side of the first adapter 31 facing away from the sixth side plate 16 (the side facing the fifth side plate 15), and the second connecting portion 512 can be located on the side of the first electrode tab 21 facing away from the sixth side plate 16. The included angle formed between the side of the second connecting portion 512 facing the first electrode tab 21 and the side of the fourth connecting piece 54 that contacts the first electrode tab 21 can be between 80° and 120°, for example, 80°, 90°, 100°, 110°, or 120°, meaning they are not parallel, for example, they can be perpendicular.

[0068] Specifically, the first connecting portion 511 and the second connecting portion 512 can be integrally formed to form the first connecting piece 51. The surfaces of the first connecting portion 511 and the second connecting portion 512 can be basically flush, that is, the first connecting piece 51 can be a straight structure without a large degree of bending, but it is not limited to this. The surface of the first connecting piece 51 is not parallel to the surface of the fourth connecting piece 54, for example, it is perpendicular.

[0069] Furthermore, the first connecting piece 51 and the first adapter 31 can be welded, and a solder mark is formed on the side of the first connecting piece 51 opposite to the first adapter 31. Specifically, when the first connecting piece 51 includes the aforementioned first connecting portion 511 and second connecting portion 512, the first connecting portion 511 and the first adapter 31 can be welded, and a solder mark is formed on the side of the first connecting portion 511 opposite to the first adapter 31. Specifically, the projection of the first adapter 31 in the thickness direction of the cell 2 overlaps with the projection of the first connecting piece 51 in the thickness direction of the cell 2, and the welding area between the two is located within this overlapping area.

[0070] like Figures 1 to 11 As shown, the first adapter 31 has a third groove 300 on the side opposite to the first side plate 11. The third groove 300 is connected to the second through hole 310 and the cavity respectively. The first through hole 100, the second through hole 310, the third groove 300 and the cavity are connected in sequence so that the first through hole 100 is connected to the cavity. The third groove 300 can be used as an electrolyte flow channel to facilitate the injection of electrolyte.

[0071] like Figure 11As shown, in some embodiments, the cross-section of the third groove 300 parallel to the direction from the side of the first adapter 31 facing the first side plate 11 to the side of the first adapter 31 away from the first side plate 11 is arc-shaped, for example, semi-circular (the first adapter 31 is an arched structure). In this way, along the depth direction of the third groove 300, the thickness of the sidewall surrounding the third groove 300 (as described below as the second adapter portion 312) gradually increases (i.e., the closer to the interior of the third groove 300, the greater the thickness of the sidewall surrounding the third groove 300). This facilitates the welding of the first adapter 31 to the first side plate 11 and the first connecting piece 51 respectively, avoiding large deformations during the welding process of the first adapter 31 and the first connecting piece 51, which would affect the stability of the connection structure and thus improve the manufacturing yield and performance of the battery.

[0072] The thickness of the thinnest part of the first adapter 31 (the minimum thickness of the sidewall surrounding the third groove 300) can be 0.2mm to 1mm, for example, 0.2mm, 0.5mm, 0.8mm, 1mm, etc. The thickness of the thinnest part refers to the thickness along the direction from the side facing the third groove 300 to the side away from the third groove 300.

[0073] Specifically, such as Figure 11 As shown, the minimum thickness of the first adapter 31 in the direction from the first side plate 11 to the first adapter 31 is 0.2mm to 1mm, for example, 0.2mm, 0.5mm, 0.8mm, 1mm, etc.; the minimum thickness of the first adapter 31 in the thickness direction of the cell 2 is 0.2mm to 1mm, for example, 0.2mm, 0.5mm, 0.8mm, 1mm, etc.

[0074] like Figure 11 As shown, along the length of the first adapter 31, the third groove 300 penetrates the first adapter 31, meaning the axial direction of the third groove 300 is the same as the length direction of the first adapter 31. The side of the first adapter 31 that contacts the first connecting piece 51 and the side of the first adapter 31 that contacts the first side plate 11 are parallel to the length direction of the first adapter 31, respectively. Furthermore, the axial direction of the third groove 300 can be perpendicular to the axial direction of the second through hole 310.

[0075] Specifically, such as Figure 11As shown, the first adapter 31 has a first adapter portion 311. One end of the first adapter portion 311, facing away from the first side plate 11, extends outward to form a second adapter portion 312. The second adapter portion 312 and the first adapter portion 311 together form a third groove 300. Alternatively, the other end of the first adapter portion 311, facing away from the first side plate, extends outward to form a third adapter portion 313. The third adapter portion 313, the first adapter portion 311, and the second adapter portion 312 together form a third groove 300. The length direction (also the axial direction of the third groove 300) and length of the first adapter portion 311, the second adapter portion 312, the third adapter portion 313, and the third groove 300 are the same. In particular, in the direction close to the first adapter 311, the thickness of the second adapter 312 and the thickness of the third adapter 313 gradually increase, making the cross-section of the third groove 300 arc-shaped. Specifically, the side of the second adapter 312 facing away from the first adapter 311 and the side of the third adapter 313 facing away from the first adapter 311 are basically on the same plane, making the cross-section of the third groove 300 semi-circular.

[0076] Specifically, the first adapter 31 can be integrally formed, for example, by bending a sheet metal part, or by metal powder metallurgy.

[0077] In other embodiments, such as Figures 6 to 10 As shown, the first adapter 31 includes a first adapter portion 311 and a second adapter portion 312 surrounding a third groove 300. A second through hole 310 is provided on the first adapter portion 311. The first adapter portion 311 is connected to the first side plate 11, and the first connecting member is connected to the second adapter portion 312. Specifically, the first connecting piece 51 of the first connecting member is connected to the side of the second adapter portion 312 away from the third groove 300, so that the first adapter 31 is connected to the first electrode tab 21 through the first connecting member.

[0078] like Figures 7 to 10 As shown, an angle is formed between the first adapter 311 and the second adapter 312, for example, not greater than 90° (i.e., an angle of not more than 90° is formed between the surfaces or planes of the two). One or more reinforcing ribs 315 are provided between the second adapter 312 and the first adapter 311. Specifically, the reinforcing rib 315 is located in the third groove 300, specifically at the angle between the first adapter 311 and the second adapter 312. One end of the rib is connected to the first adapter 311, and the other end is connected to the second adapter 312, thereby supporting the first adapter 311 and the second adapter 312, improving the structural stability of the first adapter 31, and preventing deformation during welding or other processes of the second adapter 312.

[0079] like Figures 7 to 10As shown, the junction of the second transition portion 312 and the first transition portion 311 has a reinforcing region 314 corresponding to the position of the reinforcing rib 315. The reinforcing region 314 is recessed in the direction of the angle between the second transition portion 312 and the first transition portion 311 (facing the third groove 300) and forms the reinforcing rib 315. That is, in the reinforcing region 314, the outer side of the junction of the second transition portion 312 and the first transition portion 311 (the side away from the third groove 300 / the side facing the first side plate 11) is recessed to form a fourth groove. The fourth groove has two opposing side walls and a bottom wall (i.e., the reinforcing rib 315) located between the two side walls. One side wall is connected to the first transition portion 311 and extends to the bottom wall from the side where it is connected to the first transition portion 311. The other side wall is connected to the second transition portion 312 and extends to the bottom wall from the side where it is connected to the second transition portion 312. The cross-sectional shape of the side wall of the fourth groove is, for example, triangular.

[0080] Specifically, the reinforcing rib 315 can be formed by stamping the reinforcing area, that is, stamping is performed from the outside of the junction of the second transition portion 312 and the first transition portion 311, so that it is recessed in the direction of the angle between the first transition portion 311 and the second transition portion 312 to form the reinforcing rib 315.

[0081] like Figures 7 to 10 As shown, the angle (fifth included angle α1) between the line connecting the end of the reinforcing rib 315 that connects to the first transition portion 311 and the end of the reinforcing rib 315 that connects to the second transition portion 312 and the surface of the first transition portion 311 (the side of the first transition portion that connects to the reinforcing rib 315) is 30° to 60°, for example, 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc. The angle (sixth included angle α2) between the line connecting the end of the reinforcing rib 315 that connects to the first transition portion 311 and the end of the reinforcing rib 315 that connects to the second transition portion 312 and the surface of the second transition portion 312 (the side that connects to the reinforcing rib 315) is 30-60°, for example, 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0082] For example, the side of the reinforcing rib 315 located in the third groove 300 is an inclined surface (one end of which is connected to the first transition part 311 and the other end is connected to the second transition part 312). The angle between the inclined surface and the side of the first transition part 311 connected to the reinforcing rib 315 is 30° to 60°, and the angle between the inclined surface and the side of the second transition part 312 connected to the reinforcing rib 315 is 30° to 60°.

[0083] like Figures 6 to 10As shown, the first adapter 31 also includes a third adapter 313 connected to the first adapter 311. The third adapter 313 and the second adapter 312 are located on opposite sides of the first adapter 311, that is, the third adapter 313, the first adapter 311, and the second adapter 312 are connected in sequence to form a third groove 300. The first adapter 311 forms the bottom wall of the third groove 300, and the second adapter 312 and the third adapter 313 form the side walls of the third groove 300. The third groove 300 faces away from the opening of the first adapter 311 and towards the cavity / cell 2.

[0084] One side of the second adapter 312 is connected to one side of the first adapter 311, and the other side of the second adapter 312 extends outward along the thickness direction of the first adapter 311 (the direction in which the first adapter 311 is away from the first side plate). One side of the third adapter 313 is connected to the other side of the first adapter 311, and the other side of the third adapter 313 extends outward along the thickness direction of the first adapter 311. The length direction and length of the first adapter 311, the second adapter 312, and the third adapter 313 can be the same. The width direction and width of the second adapter 312 and the third adapter 313 can be the same, and their width direction is the same as the thickness direction of the first adapter 311.

[0085] The second through hole 310 can be provided in the middle of the first transition portion 311, without extending to the second transition portion 312 and the third transition portion 313. The distance from the second through hole 310 to the second transition portion 312 and the distance from the second through hole 310 to the third transition portion can be equal or unequal, preferably equal.

[0086] Specifically, in the projection of the first transition portion 311 perpendicular to the axial direction of the second through hole 310, the center of the second through hole 310 is the center point of the first transition portion 311. For example, as shown... Figures 1 to 11 As shown, the projection of the first transition portion 311 perpendicular to the axial direction of the second through hole 310 is a basically regular quadrilateral. The first transition portion 311 has opposing first and third sides, as well as opposing second and fourth sides. The directions from the first side to the third side and from the second side to the fourth side are both perpendicular to the axial direction of the second through hole 310. The directions from the first side to the third side and from the second side to the fourth side can be perpendicular to each other. The distance from the second through hole 310 to the first side of the first transition portion 311 is substantially equal to the distance from the second through hole 310 to the third side of the first transition portion 311, and the distance from the second through hole 310 to the second side of the first transition portion 311 is substantially equal to the distance from the second through hole 310 to the fourth side of the first transition portion 311. For example, the second transition portion 312 is connected to the first side of the first transition portion 311, and the third transition portion 313 is connected to the third side of the first transition portion 311.

[0087] Specifically, the second adapter 312 may be located on the side of the first adapter 311 facing the fifth side plate 15, and the third adapter 313 may be located on the side of the first adapter 311 facing the sixth side plate 16.

[0088] Generally, the axial direction of the first through hole 100 is the same as the thickness direction of the first side plate 11, and the axial direction of the second through hole 310 is the same as the thickness direction of the first transition part 311.

[0089] In this embodiment of the invention, the side of the first adapter 31 that is in contact with the first connecting piece 51 (the side of the first connecting piece 51 that is in contact with the first adapter 31) is the side of the second adapter 312 that is in contact with the first connecting piece 51, and the side of the first adapter 31 that is in contact with the first side plate 11 (the side of the first adapter 31 facing the first side plate 11) is the side of the first adapter 311 that is in contact with the first side plate 11 (the side of the first adapter 311 facing the first side plate 11).

[0090] Specifically, the first connecting piece 51 and the second adapter portion 312 can be welded, and a solder mark is formed on the side of the first connecting piece 51 opposite to the second adapter portion 312. When the first connecting piece 51 includes the aforementioned first connecting portion 511 and second connecting portion 512, the first connecting portion 511 and the second adapter portion 312 can be welded, and a solder mark is formed on the side of the first connecting portion 511 opposite to the second adapter portion 312. Specifically, the projection of the second adapter portion 312 in the thickness direction of the cell 2 overlaps with the projection of the first connecting piece 51 in the thickness direction of the cell 2, and the welding area between the two is located within this overlapping area.

[0091] In some embodiments, the projection of the first adapter 31 on the first side plate 11 does not overlap with the projection of the first tab 21 on the first side plate 11 (i.e., the projection of the first adapter 31 parallel to the extending direction of the first side plate 11 does not overlap with the projection of the first tab 21 parallel to the extending direction of the first side plate 11). Therefore, the first tab 21 and the first adapter 31 are not distributed along the direction from the cell 2 to the first side plate 11. Specifically, along the direction from the first side plate 11 to the cell 2, the distance from the first side plate 11 to the cell 2 is a1, and the side of the first tab 21 that is connected to the cell 2 extends away from the cell. The distance from one side of cell 2 (i.e., the side facing the first side plate 11) is b1, and the distance from the side of the first adapter 31 facing cell 2 (i.e., the side away from the first side plate 11) to the side of the first adapter 31 facing the first side plate 11 (i.e., the length of the first adapter 31 in the direction from the first side plate 11 to cell 2) is c1, where a1 < b1 + c1. Therefore, compared with the arrangement of the tabs and adapters along the length of the casing, the technical solution of this embodiment can make full use of the space between the cell and the first side plate, which can save cavity space, thereby increasing the size of the cell and improving the energy density of the battery.

[0092] In addition, the housing 1 includes a second side plate 12 connected to the first side plate 11. The projection of the first adapter 31 on the second side plate 12 at least partially overlaps with the projection of the first electrode 21 on the second side plate 12 (that is, the projection of the first adapter 31 perpendicular to the extension direction of the first side plate 11 at least partially overlaps with the projection of the first electrode 21 perpendicular to the extension direction of the first side plate 11). In other words, the first adapter 31 and the first electrode 21 are distributed along the extension direction of the first side plate 11, thereby facilitating the connection between the first electrode 21 and the first adapter 31 and further saving cavity space.

[0093] Specifically, the surface of the second side plate 12 can be perpendicular to the surface of the first side plate 11. The battery cell 2 can include multiple stacked electrode sheets. The surface of the second side plate 12 is perpendicular to the surface of the electrode sheets (parallel to the thickness direction of the electrode sheets), and the surface of the first side plate 11 is perpendicular to the surface of the electrode sheets.

[0094] In some specific embodiments, such as Figure 1 and Figure 16 As shown, the projection of the first adapter 31 perpendicular to the width direction of the battery cell 2 and the projection of the first tab 21 perpendicular to the width direction of the battery cell 2 at least partially overlap, that is, the first adapter 31 and the first tab 21 are distributed along the width direction of the battery cell 2.

[0095] Specifically, the extending direction of the first side plate 11 is parallel to the surface of the first side plate 11, and the direction from the first side plate 11 to the cell 2 can be parallel to the length direction of the housing 1. The extending direction of the first side plate 11 can be the width direction or the thickness direction of the housing 1. For example, as shown... Figures 1 to 5 As shown, the extension direction of the first side plate 11 is the width direction of the shell 1.

[0096] Generally, the length direction of the housing 1 is also the length direction of the battery cell 2, the width direction of the housing 1 is also the width direction of the battery cell 2, and the thickness direction of the housing 1 is also the thickness direction of the battery cell 2. In addition, the battery cell 2 may include multiple stacked electrode sheets, which are stacked along the thickness direction of the battery cell 2, that is, the thickness direction of the battery cell 2 is also the thickness direction of the electrode sheets.

[0097] like Figure 1 As shown, a sixth insulating layer 86 is also provided on the side of the first connecting piece 51 (or the first connecting portion 511 of the first connecting piece 51) facing away from the first adapter 31 / second adapter 312.

[0098] like Figure 1 , Figure 15 and Figure 16As shown, the battery may further include a third insulating layer 83, which is located between the first connector 5 and the first side plate 11. Specifically, the third insulating layer 83 may include a first portion located on the side of the fourth connecting piece 54 facing away from the first tab 21.

[0099] In some embodiments, the battery cell 2 includes a plurality of stacked electrode sheets, the battery cell 2 has a first side and a second side disposed opposite to each other, and the third insulating layer 83 further includes a second part extending from one end of the first part near the first side of the battery cell 2 in a direction close to the battery cell 2 and a third part extending from one end of the first part near the second side of the battery cell 2 in a direction close to the battery cell 2.

[0100] like Figure 1 , Figure 15 and Figure 16 As shown, the second, first, and third portions of the third insulating layer 83 are connected in sequence and form a first groove. The bottom wall of the first groove is the first portion of the third insulating layer 83, and the side walls are the second and third portions of the third insulating layer 83, respectively. The first tab 21 and the portion of the first connector that connects to the first tab 21 (such as the fourth connecting piece 54 and the second connecting portion 512 of the first connecting piece 51 located on the side of the first tab 21) are located in the first groove and covered by the third insulating layer 83, thereby preventing the first tab 21 or the first connecting piece 51 from contacting the casing. At the same time, it protects the first tab 21 and the first connector, preventing the first tab 21 and the first connector from colliding with the casing during battery drops. This further improves the stability and safety of the battery.

[0101] Specifically, the first electrode 21 has a first side and a second side, which are located on opposite sides of the side of the first electrode 21 that contacts the fourth connecting piece 54 (i.e., the side of the first electrode 21 facing away from the battery cell 2). When the first connecting piece 51 and the fourth connecting piece 54 are connected by the first connecting assembly (i.e., the second connecting piece 52 and the third connecting piece 53) (e.g.) Figures 1 to 3 As shown), the third insulating layer 83 includes a first portion located on the side of the fourth connecting piece 54 opposite to the first electrode tab 21, a second portion located on the first side of the first electrode tab 21, and a third portion located on the second side of the first electrode tab 21; when the first connecting piece 51 of the first connector includes a first connecting portion 511 and a second connecting portion 512 (as shown), Figure 15 As shown), the second connecting portion 512 extends to the first side of the first electrode tab 21, and the third insulating layer 83 includes a first portion located on the side of the fourth connecting piece 54 opposite to the first electrode tab 21, a second portion located on the side of the second connecting portion 512 opposite to the first electrode tab 21, and a third portion located on the side of the first electrode tab 21 opposite to the second connecting portion 512 (second side).

[0102] In some embodiments, the projection of the first tab 21 in the thickness direction of the cell 2 lies within the projection of the second portion of the third insulating layer 83 in the thickness direction of the cell 2; the projection of the first tab 21 in the thickness direction of the cell 2 lies within the projection of the third portion of the third insulating layer 83 in the thickness direction of the cell 2; and the projection of the first tab 21 in the length direction of the cell 2 lies within the projection of the first portion of the third insulating layer 83 in the length direction of the cell 2. That is, the third insulating layer 83 completely covers the first tab 21 and the portion where the first connector is in contact with the first tab 21. The directions from the second portion to the first tab 21, the third portion to the first tab 21, the second portion to the third portion, and the thickness direction of the cell 2 can be parallel, and the direction from the first portion to the first tab 21 is parallel to the length direction of the cell 2.

[0103] In some preferred embodiments, the second portion of the third insulating layer 83 extends to the first surface of the cell 2 and is bonded to the electrode sheet (the electrode sheet near the housing 1) located on the first surface of the cell 2, and the third portion of the third insulating layer 83 extends to the second surface of the cell 2 and is bonded to the electrode sheet (the electrode sheet near the housing 1) located on the second surface of the cell 2. Thus, the third insulating layer 83 wraps around the side of the cell 2, which can further improve the stability of the cell 2.

[0104] like Figure 1 and Figure 16 As shown, a second insulating layer 82 may also be provided between the first adapter 31 and the battery cell 2 to prevent the first adapter 31 from short-circuiting with the electrode plates of opposite polarity in the battery cell 2. Specifically, when the first adapter 31 has a second connecting piece 52, the second insulating layer 82 is located between the second connecting piece 52 and the battery cell 2.

[0105] In some embodiments, such as Figure 1 and Figure 16 As shown, the second insulating layer 82 extends to the first side of the battery cell 2 and is bonded to the electrode sheet located on the first side of the battery cell 2. The second insulating layer 82 extends to the second side of the battery cell 2 and is bonded to the electrode sheet located on the second side of the battery cell 2. In this way, the second insulating layer 82 wraps around the side of the battery cell 2 and can also fix the battery cell 2, thereby improving the stability of the battery cell 2.

[0106] In some embodiments, the battery cell 2 includes a plurality of stacked electrode sheets, the electrode sheets including a first electrode sheet, the first electrode sheet including a first current collector, and a first tab 21 disposed on the first current collector; along the direction from the first adapter 31 to the battery cell 2, the distance between the first adapter 31 and the first current collector is less than 1 mm, that is, the distance between the first adapter 31 and the first current collector in the direction from the first adapter 31 to the battery cell 2 is less than 1 mm, thereby further shortening the space occupied by the first adapter 31 and the first tab 21, improving the space utilization of the cavity, expanding the occupied area of ​​the electrode sheets, and enhancing the energy density of the battery cell.

[0107] In some embodiments, the distance from the side of the first tab 21 away from the cell 2 to the side of the first tab 21 that is connected to the cell 2 is not greater than the length of the first adapter 31 along the direction from the first side plate 11 to the first tab 21 (i.e., the length of the first adapter 31 along the direction from the first side plate 11 to the first tab 21). This increases the overlapping area of ​​the projection of the first adapter 31 on the second side plate 12 and the projection of the first tab 21 on the second side plate 12, thereby protecting the first tab 21 in the width direction of the cell and preventing the first tab 21 from falling off during a drop or collision of the battery. At the same time, it can further increase the area of ​​the electrode plates of the cell, which is beneficial to further improve the battery's energy density and other performance.

[0108] In some embodiments, the length c1 of the first adapter 31 in the direction from the first side plate 11 to the first electrode 21 is 1mm-4mm, such as 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

[0109] In addition, the battery cell 2 is provided with a second tab 22, which has the opposite polarity to the first tab 21; the battery also includes a second adapter 32, which is electrically connected to the second tab 22. The second adapter 32 is disposed between the first side plate 11 and the battery cell 2. The projection of the second adapter 32 on the first side plate 11 does not overlap with the projection of the second tab 22 on the first side plate 11 (that is, the projection of the second adapter 32 parallel to the extension direction of the first side plate 11 does not overlap with the projection of the second tab 22 parallel to the extension direction of the first side plate 11).

[0110] Therefore, the second tab 22 and the second adapter 32 are not distributed along the direction from the cell 2 to the first side plate 11. Specifically, along the direction from the first side plate 11 to the cell 2, the distance from the first side plate 11 to the cell 2 is a1, the distance from the side of the second tab 22 that is connected to the cell 2 to the side of the second tab 22 that is away from the cell 2 (i.e., the side facing the first side plate 11) is b2, and the distance from the side of the second adapter 32 that faces the cell 2 (i.e., the side away from the first side plate 11) to the side of the second adapter 32 that faces the first side plate 11 (i.e., the length of the second adapter 32 along the direction from the first side plate 11 to the cell 2) is c2, where a1 < b2 + c2. This can further save cavity space and improve the energy density and other performance of the battery.

[0111] Among them, b2 and b1 can be equal or unequal, and c2 and c1 can be equal or unequal.

[0112] Specifically, the projections of the first tab 21, the second tab 22, the first adapter 31, and the second adapter 32 on the first side plate do not overlap.

[0113] like Figure 11 and Figure 16 As shown, the projection of the second adapter 32 on the second side plate 12 at least partially overlaps with the projection of the second tab 22 on the second side plate 12 (that is, the projection of the second adapter 32 perpendicular to the extension direction of the first side plate 11 at least partially overlaps with the projection of the second tab 22 perpendicular to the extension direction of the first side plate 11). In other words, the second adapter 32 and the second tab 22 are arranged along the extension direction of the first side plate, specifically in the width direction of the cell. This facilitates the connection between the second adapter 32 and the second tab 22, further saves cavity space, and improves the energy density and other performance of the battery.

[0114] Furthermore, the projection of the first electrode 21 on the second side plate 12 at least partially overlaps with the projection of the second electrode 22 on the second side plate 12 (i.e., the projection of the first electrode 21 perpendicular to the extending direction of the first side plate 11 at least partially overlaps with the projection of the second electrode 22 perpendicular to the extending direction of the first side plate 11). The projection of the first adapter 31 on the second side plate 12 at least partially overlaps with the projection of the second adapter 32 on the second side plate 12.

[0115] Specifically, such as Figure 1 and Figure 16 As shown, the projection of the first tab 21 perpendicular to the width direction of the cell 2 at least partially overlaps with the projection of the second tab 22 perpendicular to the width direction of the cell 2, and the projection of the second adapter 32 perpendicular to the width direction of the cell 2 at least partially overlaps with the projection of the second tab 22 perpendicular to the width direction of the cell 2.

[0116] Furthermore, the first tab 21 and the second tab 22 can be located between the first adapter 31 and the second adapter 32, thereby making full use of the space between the first adapter 31 and the second adapter 32 and further expanding the length dimension of the electrode sheet of the battery cell 2 to improve the energy density of the battery cell. For example, in the direction parallel to the first adapter 31 to the first tab 21, the first tab 21 and the second tab 22 are located between the first adapter 31 and the second adapter 32, that is, the first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 can be arranged sequentially. For example, the first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 can be arranged sequentially in the width direction of the battery cell 2, and the first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 can be basically coaxially arranged.

[0117] However, this is not the only option. In other embodiments, the first adapter 31 and the second adapter 32 may be located between the first tab 21 and the second tab 22.

[0118] Furthermore, the first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 generally do not extend beyond the outer edge of the end face of the battery cell 2 (the end face of the battery cell 2 facing the first side plate 11). They do not extend beyond the outer edge of the battery cell 2 in either the thickness or width direction. That is, the projection of the battery cell 2 on the first side plate 11 covers the projection of the first adapter 31 on the first side plate 11, the projection of the battery cell 2 on the first side plate 11 covers the projection of the first tab 21 on the first side plate 11, the projection of the battery cell 2 on the first side plate 11 covers the projection of the second tab 22 on the first side plate 11, and the projection of the battery cell 2 on the first side plate 11 covers the projection of the second adapter 32 on the first side plate 11.

[0119] like Figures 1 to 5 As shown, the battery also includes an external connector 41 disposed on the side of the first side plate 11 of the housing 1 facing away from the cavity. The external connector 41 includes an outwardly protruding terminal post 42, which penetrates the first side plate 11 and connects to the second adapter. The terminal post 42 is generally formed by protruding outward along the thickness direction of the external connector 41, that is, the axial direction of the terminal post 42 is parallel to the thickness direction of the external connector 41.

[0120] Specifically, the first side plate 11 is provided with a fifth through hole 110 corresponding to the pole post 42. The pole post 42 passes through the fifth through hole 110 to penetrate the first side plate 11 and connect to the second adapter 32.

[0121] In addition, the second adapter 32 includes a third through hole 320 corresponding to the pole post 42. The pole post 42 penetrates the first side plate 11 and is connected to the second adapter 32 through the third through hole 320. The fifth through hole 110 and the third through hole 320 can be coaxially arranged.

[0122] Generally, the cross-section of the pole post 42 perpendicular to its axial direction is circular, such as... Figure 12 As shown, pole piece 2 can be cylindrical; or, as... Figure 13 As shown, the pole post has a conical structure, that is, along the direction away from the outer plate 41 (from the first side plate 11 to the second adapter 32), the diameter of the pole post 42 tends to increase or decrease. The diameter of the pole post 42 is the diameter of the cross section of the pole post 42 perpendicular to the axial direction of the pole post 42.

[0123] Specifically, when the pole post 42 has a tapered structure, the diameter of the pole post 42 changes (i.e., increases or decreases) along the direction from the first side plate 11 to the second adapter 32. This change can be gradual, i.e., it increases or decreases uniformly with a basically the same amplitude. The apertures (diameters) of the fifth through hole 110 and the third through hole 320 change accordingly with the diameter of the pole post 42. For example, along the direction from the first side plate 11 to the second adapter 32, the diameter of the pole post 42 gradually increases, and at this time, the apertures of the fifth through hole 110 and the third through hole 320 also gradually increase; along the direction from the first side plate 11 to the second adapter 32, the diameter of the pole post 42 gradually decreases, and at this time, the apertures of the fifth through hole 110 and the third through hole 320 also gradually decrease.

[0124] In some embodiments, such as Figure 12 and Figure 13 As shown, the third through hole 320 of the second adapter 32 includes a first hole segment and a second hole segment connected to each other. The second hole segment is located on the side of the first hole segment near the battery cell 2. The end of the pole post 42 near the battery cell 2 extends outward to form an extension portion 43 corresponding to the second hole segment.

[0125] Specifically, the first hole segment and the second hole segment can be coaxially arranged. Both the first hole segment and the second hole segment are circular through holes. The diameter of the second hole segment is larger than the diameter of the end where the first hole segment and the second hole segment meet. Preferably, the diameter of the second hole segment is larger than the diameter of the first hole segment. The projection of the second hole segment perpendicular to the axial direction of the third through hole 320 can cover the projection of the first hole segment perpendicular to the axial direction of the third through hole 320.

[0126] Furthermore, the cross-sectional area of ​​the outer tab 41 perpendicular to the axis of the pole post 42 can be larger than the cross-sectional area of ​​the pole post 42 perpendicular to the axis of the pole post 42. The projection of the outer tab 41 perpendicular to the axis of the pole post 42 covers the projection of the pole post 42 perpendicular to the axis of the pole post 42. Similarly, the cross-sectional area of ​​the extension portion 43 perpendicular to the pole post 42 is larger than the cross-sectional area of ​​the pole post 42 perpendicular to the axis of the pole post 42. The projection of the extension portion 43 perpendicular to the axis of the pole post 42 covers the projection of the pole post 42 perpendicular to the axis of the pole post 42. The axial projection of the outer piece 41 perpendicular to the axial direction of the pole post 42 is greater than the axial projection of the extension portion 43 perpendicular to the axial direction of the pole post 42. The projection of the outer piece 41 perpendicular to the axial direction of the pole post 42 covers the projection of the extension portion 43 perpendicular to the axial direction of the pole post 42. The axial projection of the extension portion 43 perpendicular to the axial direction of the pole post 42 is basically equal to the axial projection of the second hole segment perpendicular to the pole post 42. The extension portion 43 is engaged with the second hole segment and is connected to the side wall of the second hole segment.

[0127] like Figure 12 and Figure 13 As shown, the end face of the electrode post 42 near the cell 2 is flush with the surface of the second adapter 32 near the cell 2. This not only ensures the bonding strength between the electrode post 42 and the second adapter 32, but also prevents the electrode post 42 from interfering with the connection between the second tab 22 or the fifth connecting piece 55 and the second adapter 32. Specifically, the thickness of the extension portion 43 along the axial direction of the third through hole 320 (which is also the axial direction of the electrode post 42) is basically equal to the depth of the second hole section along the axial direction of the third through hole 320. Thus, the extension portion 43 is snapped into the second hole section, and the end face of the extension portion 43 near the cell 2 is flush with the surface of the second adapter 32 facing the cell 2.

[0128] In addition, the end of the pole post 42 near the cell 2 can also extend out of the third through hole 320 and extend outward along the circumference of the third through hole 320 to form an extension portion 43 that is in contact with the side surface of the second adapter 32 near the cell 2. That is, the end surface of the pole post 42 near the cell 2 is not flush with the side surface of the second adapter 32 facing the cell 2, but is located between the second adapter 32 and the cell 2.

[0129] Among them, the epitaxial sheet, the pole post 42, and the epitaxial portion 43 can be integrally formed and can be made of metal. In specific implementation, the second adapter 32 can be riveted to the first side plate 11 by riveting. After riveting, the rivet is located at one end of the first side plate 11 away from the cavity to form the outer sheet 41, and the other end forms the epitaxial portion 43. The part between the two ends forms the pole post 42, and the pole post 42 formed is, for example, a conical structure.

[0130] Normally, the second electrode tab 22 is insulated from the housing 1, specifically by providing an insulating sheet (insulating layer). In some embodiments, such as Figures 1 to 5 , Figures 12 to 14 As shown, a first insulating sheet 6 is provided between the outer connecting piece 41 and the first side plate 11, and a second insulating sheet 7 is provided between the second adapter 32 and the first side plate 11. That is, the outer connecting piece 41, the first insulating sheet 6, the first side plate 11, the second insulating sheet 7, and the second adapter 32 are stacked in sequence, and the pole post 42 penetrates the first insulating sheet 6 and the second insulating sheet 7. A first insulating layer 81 is provided between the pole post 42 and the first side plate 11. Thus, the outer connecting piece 41, the pole post 42, the second adapter 32, and the second pole ear 22 are electrically connected, while being insulated from the first side plate 11 (shell 1).

[0131] Wherein, along the circumferential direction of the third through hole 320, the difference between the diameter of the third through hole 320 and the diameter of the pole post 42 is approximately equal to the width of the first insulating layer 81 along the circumferential direction of the third through hole 320, and the circumferential direction of the third through hole 320 is perpendicular to the axial direction of the third through hole 320. Specifically, the first insulating layer 81 can be integrally formed with the first insulating sheet 6, and the first insulating layer 81 is formed by the first insulating sheet 6 protruding outward (protruding into the second through hole 110) from the side near the first side plate 11; or the first insulating layer 81 can be integrally formed with the second insulating sheet 7, and the first insulating layer 81 is formed by the second insulating sheet 7 protruding outward (protruding into the second through hole 110) from the side near the first side plate 11.

[0132] Accordingly, the first insulating sheet 6 has a sixth through hole 60, through which the pole post 42 passes to penetrate the first insulating sheet 6; the second insulating sheet 7 has a fourth through hole 70, through which the pole post 42 passes to penetrate the second insulating sheet 7. Specifically, the pole post 42 passes sequentially through the sixth through hole 60, the fifth through hole 110, the fourth through hole 70, and the third through hole 320 to connect with the second adapter 32. The sixth through hole 60, the fifth through hole 110, the fourth through hole 70, and the third through hole 320 can be coaxially arranged.

[0133] like Figures 1 to 5 , Figures 12 to 14 As shown, the projection of the first insulating sheet 6 on the first side plate 11 can cover the projection of the outer connecting piece 41 on the first side plate 11 (i.e., the projection of the outer connecting piece 41 on the first side plate 11 is within the projection of the first insulating sheet 6 on the first side plate 11), thereby preventing the outer connecting piece 41 from contacting the housing 1 and ensuring the insulation of the housing. Furthermore, the projection of the second insulating sheet 7 on the first side plate 11 can cover the projection of the second adapter 32 on the first side plate 11 (i.e., the projection of the second adapter 32 on the first side plate 11 is within the projection of the second insulating sheet 7 on the first side plate 11), thereby preventing the second adapter 32 from contacting the housing 1 and ensuring the insulation of the housing. This further improves the battery's safety and stability.

[0134] like Figure 13 and Figure 14As shown, the housing 1 also includes a sixth side plate 16 connected to the first side plate 11. The second insulating sheet 7 can be an L-shaped structure, which includes a first insulating part 71 and a second insulating part 72 connected together. The first insulating part 71 is located between the second adapter 32 and the first side plate 11. The pole post 42 penetrates the first insulating part 71 (the first insulating part 71 is provided with a fourth through hole 70 corresponding to the pole post 42). The second insulating part 72 is located between the second adapter 32 and the sixth side plate 16. Thus, the second insulating part 72 can provide support and reinforcement for the second adapter 32, and can insulate the second adapter 32 from the sixth side plate 16 of the housing 1, thereby improving the safety and stability of the battery.

[0135] The projection of the first insulating part 71 on the first side plate 11 can cover the projection of the second adapter 32 on the first side plate 11 (i.e., the projection of the second adapter 32 on the first side plate 11 is within the projection of the first insulating part 71 on the first side plate 11), and the projection of the second insulating part 72 on the sixth side plate 16 can cover the projection of the second adapter 32 on the sixth side plate 16 (i.e., the projection of the second adapter 32 on the sixth side plate 16 is within the projection of the second insulating part 72 on the sixth side plate 16), so as to prevent the second adapter 32 from contacting the first side plate 11 or the sixth side plate 16.

[0136] The first insulating part 71 has an angle between the side that contacts the second adapter 32 and the side that contacts the second insulating part 72. The angle range is, for example, 80° to 120°, such as 80°, 90°, 100°, 110°, 120°, etc. The surface of the sixth side plate 16 is parallel to the surface of the electrode sheet; the surface of the sixth side plate 16 is not parallel to the surface of the first side plate 11, for example, it is perpendicular to it; the surface of the sixth side plate 16 is not parallel to the surface of the second side plate 12, for example, it is perpendicular to it; the sixth side plate 16 may be, for example, a bottom side plate (or a bottom plate).

[0137] In some embodiments, the distance from the side of the second tab 22 away from the cell 2 to the side of the second tab 22 connected to the cell 2 is not greater than the length of the second adapter 32 in the direction from the first side plate 11 to the second tab 22, which is beneficial to further improve the energy density and other performance of the battery.

[0138] Specifically, the second adapter 32 can be a block (or a second adapter block), and its thickness direction can be parallel to the direction from the first side plate 11 to the second electrode 22. That is, the length of the second adapter 32 in the direction from the first side plate 11 to the second electrode 22 is the thickness of the second adapter 32.

[0139] Under normal circumstances, the directions from the first side plate 11 to the first electrode 21, from the first side plate 11 to the second electrode 22, and from the first side plate 11 to the battery cell 2 are parallel.

[0140] In some embodiments, the length c2 of the second adapter 32 in the direction from the first side plate 11 to the second electrode 22 is 1mm-3mm, for example 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc.

[0141] Generally, the first tab 21 is electrically connected to the housing 1, while the second tab 22 is insulated from the housing 1. The second insulating sheet 7 may not be provided between the first adapter 31 and the first side plate 11, and the two are in direct contact, such as by welding. However, the second insulating sheet 7 may be provided between the second adapter 32 and the first side plate 11, where c2 < c1. The difference in thickness between the two (c1-c2) can be approximately equal to the thickness of the second insulating sheet 7.

[0142] The battery may also include a second connector 5' located between the cell 2 and the first side plate 11. The second connector 5' is connected to the second tab 22 and the second adapter 32 respectively (that is, the second adapter 32 is connected to the second tab 22 through the second connector 5'). Specifically, the second adapter 32, the second connector 5', and the second tab 22 may be welded in sequence.

[0143] Specifically, the second connector 5' may include a fifth connector 55 connected to the second adapter 32 and an eighth connector 58 connected to the side of the second electrode 22 facing away from the battery cell 2. For example... Figures 1 to 3 , Figure 15 and Figure 16 As shown, the second connector 5' can have a bent structure. The fifth connecting piece 55 is connected to the second adapter 32, and the eighth connecting piece 58 is connected to the second tab 22. Specifically, it can be welded. A third included angle is formed between the side of the second adapter 32 that is connected to the fifth connecting piece 55 and the side of the eighth connecting piece 58 that is connected to the second tab 22. The range of the third included angle is 80-120°, such as 80°, 90°, 100°, 110°, and 120°. That is, the two are not parallel, for example, they can be perpendicular. Therefore, the stability of the connection between the second adapter 32 and the second tab 22 through the second connector 5' can be further improved, thereby improving the stability, safety, and service life of the battery.

[0144] Furthermore, a fourth included angle is formed between the side of the second adapter 32 that contacts the fifth connecting piece 55 and the side of the second adapter 32 that faces the first side plate 11. The range of the fourth included angle is 80-120°, for example, 80°, 90°, 100°, 110°, 120°, that is, the two are not parallel, for example, they can be perpendicular.

[0145] In addition, the battery cell 2 includes multiple stacked electrode sheets, and the side of the fifth connecting piece 55 that is in contact with the second adapter 32 is parallel to the surface of the electrode sheets.

[0146] In some embodiments, such as Figures 1 to 3 As shown, the second connector 5' also includes a second connecting assembly connected to the fifth connecting piece 55 and the eighth connecting piece 58 respectively. The second connecting assembly includes a sixth connecting piece 56 and a seventh connecting piece 57. The sixth connecting piece 56 is located between the second adapter 32 and the battery cell 2. In the direction from the second adapter 32 to the second electrode 22, the seventh connecting piece 57 is located between the second adapter 32 and the second electrode 22. The fifth connecting piece 55, the sixth connecting piece 56, the seventh connecting piece 57, and the eighth connecting piece 58 are connected in sequence.

[0147] Specifically, the second connector 5' has a multi-bending structure, and its fifth connecting piece 55 is connected to the eighth connecting piece 58 in sequence through the sixth connecting piece 56 and the seventh connecting piece 57. The surface of the fifth connecting piece 55 is not parallel to the surface of the sixth connecting piece 56, for example, it is perpendicular. The surface of the sixth connecting piece 56 is not parallel to the surface of the seventh connecting piece 57, it can be perpendicular or not perpendicular. The surface of the eighth connecting piece 58 can be parallel to the surface of the sixth connecting piece 56. Thus, the stability of the connection between the second adapter 32 and the second electrode 22 can be further improved.

[0148] In other embodiments, such as Figure 15 As shown, the fifth connecting piece 55 includes a third connecting portion 551 that connects to the second adapter 32, and a fourth connecting portion 552 that extends along the extending direction of the first side plate 11 (e.g., from the second adapter 32 to the second tab 22). The fourth connecting portion 552 is connected to the eighth connecting piece 58. Specifically, the third connecting portion 551 and the fourth connecting portion 552 are located on the same side of the second adapter 32 and the same side of the second tab 22. Specifically, the third connecting portion 551 may be located on the side of the second adapter 32 facing away from the sixth side plate 16, and the fourth connecting portion 552 may be located on the side of the second tab 22 facing away from the sixth side plate 16. The side of the fourth connecting portion 552 facing the second tab 22 and the side of the eighth connecting piece 58 that connects to the second tab 22 are not parallel, for example, perpendicular.

[0149] Specifically, the third connecting part 551 and the fourth connecting part 552 can be integrally formed to form the fifth connecting piece 55. The surfaces of the third connecting part 551 and the fourth connecting part 552 can be flush, that is, the fifth connecting piece 55 can be a straight structure without significant bending, but it is not limited to this. The surface of the fifth connecting piece 55 is not parallel to the surface of the eighth connecting piece 58, for example, it is perpendicular to it. That is, the side of the fifth connecting piece 55 that contacts the second adapter 32 and the side of the eighth connecting piece 58 that contacts the second tab 22 are not parallel, for example, they are perpendicular.

[0150] Furthermore, the fifth connecting piece 55 and the second adapter 32 can be welded, and a solder mark is formed on the side of the fifth connecting piece 55 facing away from the second adapter 32. Specifically, when the fifth connecting piece 55 includes a third connecting portion 551 and a fourth connecting portion 552, the third connecting portion 551 and the second adapter 32 can be welded, and a solder mark is formed on the side of the third connecting portion 551 facing away from the second adapter 32. Specifically, the projection of the second adapter 32 in the thickness direction of the cell 2 overlaps with the projection of the fifth connecting piece 55 in the thickness direction of the cell 2, and the welding area between the two is located within this overlapping area.

[0151] In addition, a sixth insulating layer 86 is provided on the side of the fifth connecting piece 55 (or the third connecting portion 551 of the fifth connecting piece 55) facing away from the second adapter 32, such as Figure 1 As shown, the sixth insulating layer 86 may extend from the first connecting piece 51 to the fifth connecting piece 55. Specifically, it may extend from the end of the first connecting piece 51 away from the fifth connecting piece 55 to the end of the fifth connecting piece 55 away from the first connecting piece 51, covering the first connecting piece 51 and the fifth connecting piece 55.

[0152] In addition, such as Figure 1 , Figure 15 and Figure 16 As shown, it may also include a fourth insulating layer 84, which is located between the second connector 5' and the first side plate 11. Specifically, the fourth insulating layer 84 may include a fourth portion located on the side of the eighth connecting piece 58 opposite to the second tab 22.

[0153] In some embodiments, the fourth insulating layer 84 further includes a fifth portion extending from one end of the fourth portion near the first surface of the cell 2 toward the cell 2 and a sixth portion extending from one end of the fourth portion near the second surface of the cell 2 toward the cell 2.

[0154] like Figure 1 , Figure 15 and Figure 16 As shown, the fifth, fourth, and sixth portions of the fourth insulating layer 84 are connected in sequence and form a second groove. The bottom wall of the second groove is the fourth portion of the fourth insulating layer 84, and the side walls are the fifth and sixth portions of the fourth insulating layer 84, respectively. The second tab 22 and the portion of the second connector 5' that connects to the second tab 22 (such as the fourth connecting portion 552 on the side of the second tab 22 of the eighth connecting piece 58 and the fifth connecting piece 55) are located in the second groove and are covered by the fourth insulating layer 84. This can further improve the stability and safety of the battery.

[0155] Specifically, the second electrode 22 has a first side and a second side, with the first side and the second side of the second electrode 22 located on opposite sides of the side of the second electrode 22 that is in contact with the eighth connecting piece 58. When the fifth connecting piece 55 and the eighth connecting piece 58 of the second connector 5' are connected by the second connecting assembly (i.e., the sixth connecting piece 56 and the seventh connecting piece 57), the fourth insulating layer 84 includes a fourth portion located on the side of the eighth connecting piece 58 opposite to the second tab 22, a fifth portion located on the first side of the second tab 22, and a sixth portion located on the second side of the second tab 22; when the fifth connecting piece 55 of the second connector 5' includes a third connecting portion 551 and a fourth connecting portion 552, the fourth connecting portion 552 extends to the first side of the second tab 22, and the fourth insulating layer 84 includes a fourth portion located on the side of the eighth connecting piece 58 opposite to the second tab 22, a fifth portion located on the side of the fourth connecting portion 552 opposite to the second tab 22, and a sixth portion located on the side of the second tab 22 opposite to the fourth connecting portion 552 (second side).

[0156] In some embodiments, the projection of the second tab 22 in the thickness direction of the cell 2 lies within the projection of the fifth portion of the fourth insulating layer 84 in the thickness direction of the cell 2; the projection of the second tab 22 in the thickness direction of the cell 2 lies within the projection of the sixth portion of the fourth insulating layer 84 in the thickness direction of the cell 2; and the projection of the second tab 22 in the length direction of the cell 2 lies within the projection of the fourth portion of the fourth insulating layer 84 in the length direction of the cell 2. That is, the fourth insulating layer 84 completely covers the second tab 22 and the portion where the second connector 5' is connected to the second tab 22. The directions from the fifth portion to the second tab 22, the sixth portion to the second tab 22, the fifth portion to the sixth portion, and the thickness direction of the cell 2 can be parallel, and the direction from the fourth portion to the second tab 22 is parallel to the length direction of the cell 2.

[0157] In some preferred embodiments, a fifth portion of the fourth insulating layer 84 extends to the first surface of the cell 2 and is bonded to the electrode sheet located on the first surface of the cell 2, and a sixth portion of the fourth insulating layer 84 extends to the second surface of the cell 2 and is bonded to the electrode sheet located on the second surface of the cell 2. Thus, the fourth insulating layer 84 wraps around the side of the cell 2, which can further improve the stability of the cell 2.

[0158] like Figure 1 and Figure 16 As shown, a fifth insulating layer 85 may also be provided between the second adapter 32 and the battery cell 2 to prevent the second adapter 32 from short-circuiting with the electrode plates of opposite polarity in the battery cell 2. Specifically, when the second adapter 32 has a sixth connecting piece 56, the fifth insulating layer 85 is located between the sixth connecting piece 56 of the second connector 5' and the battery cell 2.

[0159] In some embodiments, the fifth insulating layer 85 extends to the first side of the battery cell 2 and is bonded to the electrode sheet located on the first side of the battery cell 2. The fifth insulating layer 85 extends to the second side of the battery cell 2 and is bonded to the electrode sheet located on the second side of the battery cell 2. In this way, the fifth insulating layer 85 wraps around the side of the battery cell 2 and can also fix the battery cell 2, thereby improving the stability of the battery cell 2.

[0160] In some embodiments, the battery cell 2 includes a plurality of stacked electrode sheets, the electrode sheets include a second electrode sheet, the second electrode sheet includes a second current collector, and a second tab 22 is disposed on the second current collector; along the direction from the second adapter 32 to the battery cell 2, the distance between the second adapter 32 and the second current collector is less than 1 mm, that is, the distance between the second adapter 32 and the second current collector along the direction from the second adapter 32 to the battery cell 2 is less than 1 mm.

[0161] Under normal circumstances, the direction from the second adapter 32 to the battery cell 2, the direction from the first adapter 31 to the battery cell 2, and the direction from the first side plate 11 to the battery cell 2 are parallel.

[0162] like Figure 16 As shown, the battery cell 2 has a side surface located between the first side surface and the second side surface of the battery cell 2, and a protective adhesive layer 9 is provided in at least a portion of at least one side surface of the battery cell 2.

[0163] Specifically, the side of the battery cell 2 is the side that exposes the outer edge of the electrode sheet in the battery cell 2. It is formed by the end faces of multiple stacked electrode sheets perpendicular to their thickness direction. That is, the side of the battery cell 2 is parallel to the thickness direction of the battery cell 2 (which is also the thickness direction of the electrode sheet).

[0164] The side surface of the battery cell 2 includes a first side surface, a second side surface, a third side surface, and a fourth side surface connected in sequence. The first side surface is the end face of the battery cell 2 facing the first side plate 11 (i.e., the side of the battery cell 2 with the first tab 21 and the second tab 22). The second side surface and the fourth side surface are located on opposite sides of the first side surface (or the third side surface). The first side surface and the third side surface can be parallel to each other, the second side surface and the fourth side surface can be parallel to each other, and the first side surface (or the third side surface) and the second side surface (or the fourth side surface) can be perpendicular to each other. The direction from the first side surface to the third side surface can be the length direction of the battery cell 2, and the direction from the second side surface to the fourth side surface can be the width direction of the battery cell 2. Alternatively, the direction from the first side surface to the third side surface can also be the width direction of the battery cell 2, and the direction from the second side surface to the fourth side surface can be the length direction of the battery cell 2.

[0165] Among them, at least one of the second side, the third side, and the fourth side is provided with a protective adhesive layer 9, that is, one or more of them (such as all of them) are provided with a protective adhesive layer 9, but not limited to this, the first side may also be provided with a protective adhesive layer 9.

[0166] Furthermore, the number of protective adhesive layers 9 on any side of the cell 2 can be one or more. When the number of protective adhesive layers 9 on any side is one, the length of the protective adhesive layer 9 on that side along the length direction of that side can be no greater than the length of that side, for example, they are basically equal. When the number of protective adhesive layers on any side is multiple, the multiple protective adhesive layers 9 are spaced apart on that side of the cell 2, thereby creating a gap between any two adjacent protective adhesive layers 9. This gap facilitates the electrolyte to wet the electrode sheets in the cell, further optimizing battery performance.

[0167] Taking the second side as an example, when there is only one protective adhesive layer 9 on the second side, the length of the protective adhesive layer 9 in the longitudinal direction of the second side may not be greater than the length of the second side, for example, it may be approximately equal to the length of the second side; when there are multiple protective adhesive layers 9 on the second side, the multiple protective adhesive layers 9 may be distributed at intervals on the second side.

[0168] In some embodiments, such as Figure 16 As shown, the protective adhesive layer 9 extends to the first side of the cell 2 and is bonded to the electrode sheet located on the first side of the cell 2 and / or extends to the second side of the cell 2 and is bonded to the electrode sheet located on the second side of the cell 2. This can prevent the electrode sheet exposed on the side of the cell 2 from contacting the casing 1, and at the same time fix the cell 2, thereby improving the safety and stability of the battery.

[0169] In addition, such as Figure 16 As shown, the protective adhesive layer 9 may have one or more seventh through holes 90, preferably multiple seventh through holes 90. These multiple seventh through holes 90 may be uniformly or unevenly distributed on the portion of the protective adhesive layer 9 opposite to the side of the battery cell (this portion of the protective adhesive layer 9 is stacked on the side of the battery cell 2 (such as the second side)). Thus, the seventh through holes 90 can improve the wettability of the electrolyte to the battery cell 2, allowing the electrolyte to better wet the electrode sheets and further optimize battery performance. Especially when the number of protective adhesive layers 9 on any one side of the battery cell 2 is one, the protective adhesive layer 9 on that side may have one or more seventh through holes 90.

[0170] The aforementioned protective adhesive layer 9 can specifically be adhesive paper, which generally has insulation and adhesion. It can be conventional adhesive paper in the field, and there are no special restrictions on it.

[0171] The first adapter 31, the first tab 21, the second tab 22, and the second adapter 32 are located on the end face of the battery cell 2 facing the first side plate 11. The first surface and the second surface of the battery cell 2 are located on opposite sides of the end face of the battery cell 2 facing the first side plate 11. The direction from the first surface to the second surface of the battery cell 2 is the thickness direction of the battery cell 2 (also the thickness direction of the electrode sheet). The first surface and the second surface of the battery cell 2 can be parallel to the surface of the electrode sheet (perpendicular to the thickness direction of the electrode sheet), and can be perpendicular to the end face of the battery cell 2 facing the first side plate 11.

[0172] In this invention, the electrode sheet located on the first side of the battery cell 2 and the electrode sheet located on the second side of the battery cell 2 are the outermost electrode sheets of the battery cell 2, that is, the remaining electrode sheets are stacked between the electrode sheets located on the first side and the electrode sheets located on the second side of the battery cell 2. The polarity of the electrode sheets located on the first side and the electrode sheets located on the second side of the battery cell 2 can be the same or different, and can be positive electrode sheets or negative electrode sheets, and can be first electrode sheets or second electrode sheets. Generally, it is preferred that the electrode sheets located on the first side and the electrode sheets located on the second side of the battery cell 2 are negative electrode sheets.

[0173] Specifically, such as Figure 1 , Figure 15 and Figure 16 As shown, the battery cell 2 includes multiple stacked electrode sheets, including a first electrode sheet and a second electrode sheet, which are separated by a separator. The first electrode sheet and the second electrode sheet have opposite polarities. The first electrode sheet can be a positive electrode sheet or a negative electrode sheet, and correspondingly, the second electrode sheet can be a negative electrode sheet or a positive electrode sheet. The end face of the battery cell 2 with tabs (first tab and second tab) (i.e., the end face of the battery cell 2 facing the first side plate 11) is parallel to the thickness direction of the battery cell 2. Specifically, the electrode sheets in the battery cell 2 include current collectors, and tabs (first tab 21 / second tab 22) are disposed on the current collectors (first current collector / second current collector), specifically at the end of the current collector. The end face of the battery cell 2 facing the first side plate 11 is formed by the end faces of multiple stacked electrode sheets with tabs (end faces of the electrode sheets parallel to their thickness direction).

[0174] The battery cell 2 may include a stacked battery cell 2 and / or a wound battery cell 2. The wound battery cell 2 is formed by stacking and winding multiple electrode sheets, specifically by stacking and winding a first electrode sheet, a separator, and a second electrode sheet in sequence. The stacked battery cell 2 is specifically formed by stacking a first electrode sheet, a separator, and a second electrode sheet in sequence. The battery of the present invention may specifically include a lithium-ion battery, but is not limited thereto.

[0175] Specifically, such as Figures 1 to 5As shown, the housing 1 may include a first side plate 11, a second side plate 12, a third side plate 13, a fourth side plate 14, a fifth side plate 15, and a sixth side plate 16. The first side plate 11, the second side plate 12, the third side plate 13, and the fourth side plate 14 are connected sequentially and are respectively located between the sixth side plate 16 (or bottom plate) and the fifth side plate 15 (or cover plate), thereby forming a sealed cavity in which the battery cell 2 is placed. The first side plate 11 and the third side plate 13 are located on opposite sides of the second side plate 12 (or the fourth side plate 14), the second side plate 12 and the fourth side plate 14 are located on opposite sides of the first side plate 11 (or the third side plate 13), and the fifth side plate 15 and the sixth side plate 16 are respectively located on opposite sides of the first side plate 11 (or the second side plate 12, or the third side plate 13, or the fourth side plate 14). The direction from the fifth side plate 15 to the sixth side plate 16 is the thickness direction of the housing 1. The direction from the first side plate 11 to the third side plate 13 can be the length direction of the housing 1, while the direction from the second side plate 12 to the fourth side plate 14 is the width direction of the housing 1. Alternatively, the direction from the first side plate 11 to the third side plate 13 can be the width direction of the housing 1, while the direction from the second side plate 12 to the fourth side plate 14 can be the length direction of the housing 1. One of the first side and the second side of the battery cell 2 is the side of the battery cell 2 facing the fifth side plate 15, and the other is the side of the battery cell 2 facing the sixth side plate 16. The sixth insulating layer 86 is located between the first connecting piece 51 and the fifth side plate 15 and / or between the fifth connecting piece 55 and the fifth side plate 15.

[0176] The first side plate 11 and the second side plate 12, the second side plate 12 and the third side plate 13, and the third side plate 13 and the fourth side plate 14 can be connected by an arc transition portion 17, that is, the connection part of two adjacent side plates is transitioned by an arc. Specifically, the arc transition portion 17 has an arc on both the side facing away from the cavity and the side perpendicular to the cavity in its cross-section in the first direction, forming a groove with an opening facing the cavity. The first direction is parallel to the direction from the fifth side plate 15 to the sixth side plate 16 (i.e., the thickness direction of the shell 1).

[0177] The casing 1 may also be provided with a thinning portion 151. The mechanical strength of the thinning portion 151 is less than the mechanical strength of other parts of the casing 1 excluding the thinning portion 151. Therefore, when the internal pressure of the battery is too high, the pressure can be released preferentially through the thinning portion 151 to avoid phenomena such as battery explosion. Specifically, the thinning portion 151 can be provided on the fifth side plate 15 (the surface of the fifth side plate 15 can be parallel to the surface of the electrode sheet). Specifically, the thickness of the thinning portion 151 is less than the thickness of other parts of the casing 1 excluding the thinning portion 151.

[0178] In addition, the housing 1 also includes a sealing sheet for sealing the first through hole 100. The first through hole 100 serves as an injection hole for injecting electrolyte into the cavity. After the electrolyte is injected, the injection hole 100 is sealed with the sealing sheet. The sealing sheet may include a metal sheet located on the side of the first side plate 11 away from the cavity. It can be welded to the side of the first side plate 11 away from the cavity. Specifically, it can be welded to the part of the first side plate 11 located around the first through hole 100 to seal the first through hole 100.

[0179] In this invention, the welding can specifically be laser welding. For example, the first connecting piece 51 of the first connecting member 5 can be connected to the second connecting part 312 of the first adapter 31 by laser welding, and the first through hole 100 can be sealed by laser welding using a sealing sheet.

[0180] The first electrode 21 can be either a positive electrode or a negative electrode, that is, one of the first electrode 21 and the second electrode 22 is a positive electrode and the other is a negative electrode. Preferably, the first electrode 21 is a positive electrode.

[0181] The shell 1 can be a metal packaging shell, that is, it can be made of metal. This means that the first side plate 11, the second side plate 12, the third side plate 13, the fourth side plate 14, the fifth side plate 15, and the sixth side plate 16 can be made of metal, such as aluminum, aluminum alloy, nickel, iron, or nickel-iron alloy.

[0182] Generally, when the housing 1 is electrically connected to the positive electrode tab, the housing 1 can be made of the same polarity as the positive electrode tab, such as aluminum or aluminum alloy. The specific materials of the two can be the same or different (for example, the positive electrode tab is made of aluminum, while the housing 1 is made of aluminum alloy). When the housing 1 is electrically connected to the negative electrode tab, the housing 1 and the negative electrode tab are made of the same polarity, such as nickel, iron or nickel-iron alloy. The specific materials of the two can be the same or different.

[0183] Furthermore, the materials of the first adapter 31, the first connector 5, and the first tab 21 can be of the same polarity. For example, the first tab 21 is a positive tab, and the materials of the first adapter 31, the first connector 5, and the first tab 21 can be aluminum or aluminum alloy, respectively. Their specific material types can be the same or different. The materials of the second adapter 32, the second connector 5', and the second tab 22 can be of the same polarity. For example, the second tab 22 is a negative tab, and the materials of the second adapter 32, the second connector 5', and the second tab 22 can be nickel, iron, or nickel-iron alloy, respectively. Their specific material types can be the same or different.

[0184] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery, characterized in that, include: A shell is configured to form a cavity; the shell includes a first side plate, the first side plate having a first through hole communicating with the cavity; the first through hole serves as a liquid injection port. The battery cell is located inside the cavity; the battery cell is provided with a first electrode tab. The first adapter is electrically connected to the first electrode tab; the first adapter is disposed between the first side plate and the battery cell, the first adapter is provided with a second through hole, the first adapter is connected to the first side plate, and the projections of the first through hole and the second through hole on the first side plate at least partially overlap. The projection of the first adapter on the first side plate does not overlap with the projection of the first electrode on the first side plate; The battery also includes a first connecting member located between the cell and the first side plate, the first connecting member being connected to the first tab and the first adapter respectively; The first connector includes a first connecting piece connected to the first adapter and a fourth connecting piece connected to the side of the first electrode opposite to the battery cell. The first connector further includes a connecting component that is connected to the first connecting piece and the fourth connecting piece respectively; the connecting component includes a second connecting piece and a third connecting piece; the second connecting piece is located between the first adapter and the battery cell; in the direction from the first adapter to the first electrode, the third connecting piece is located between the first electrode and the first adapter; the first connecting piece, the second connecting piece, the third connecting piece, and the fourth connecting piece are connected in sequence.

2. The battery according to claim 1, characterized in that, One of the projections of the first through hole and the second through hole onto the first side plate overlaps the other; and / or, The concentricity between the first through hole and the second through hole is less than or equal to 1.5 mm.

3. The battery according to claim 2, characterized in that, The first through hole and the second through hole are coaxially arranged.

4. The battery according to claim 1, characterized in that, The housing also includes a second side plate connected to the first side plate, wherein the projection of the first adapter on the second side plate at least partially overlaps with the projection of the first tab on the second side plate.

5. The battery according to claim 1, characterized in that, The first connecting piece includes a first connecting portion that connects to the first adapter and a second connecting portion that extends along the extending direction of the first side plate, the second connecting portion being connected to the fourth connecting piece.

6. The battery according to claim 1 or 5, characterized in that, The side of the first connecting piece opposite to the first adapter is further provided with a sixth insulating layer; and / or, A first included angle is formed between the side of the first adapter that contacts the first connecting piece and the side of the fourth connecting piece that contacts the first electrode tab, the first included angle being in the range of 80-120°; and / or, The first connecting piece is welded to the first adapter; and / or, The battery cell includes multiple stacked electrode plates, wherein the side of the first connecting plate that contacts the first adapter is parallel to the surface of the electrode plates; and / or, A second included angle is formed between the side of the first adapter that contacts the first side plate and the side of the first adapter that contacts the first connecting piece, the second included angle being in the range of 80-120°; and / or, The projection of the first adapter in the thickness direction of the battery cell overlaps with the projection of the first connecting piece in the thickness direction of the battery cell.

7. The battery according to claim 1, characterized in that, The first adapter has a third groove on the side opposite to the first side plate, and the third groove is connected to the second through hole and the cavity respectively.

8. The battery according to claim 7, characterized in that, The cross-section of the third groove, parallel to the direction along the side of the first adapter facing the first side plate to the side of the first adapter facing away from the first side plate, is arc-shaped; and / or, The minimum thickness of the first adapter in the direction from the first side plate to the first adapter is 0.2 mm to 1 mm; and / or, The minimum thickness of the first adapter along the thickness direction of the battery cell is 0.2mm to 1mm.

9. The battery according to claim 7, characterized in that, The first adapter includes a first adapter portion and a second adapter portion that surround the third groove. The first adapter portion is provided with the second through hole and is connected to the first side plate. The battery also includes a first connector, which is connected to the first electrode tab and the second adapter respectively; One or more reinforcing ribs are provided between the second adapter and the first adapter.

10. The battery according to claim 9, characterized in that, The junction of the second transition portion and the first transition portion has a reinforcing area corresponding to the position of the reinforcing rib. The reinforcing area is recessed towards the angle between the second transition portion and the first transition portion and forms the reinforcing rib. And / or, The angle between the line connecting the end of the reinforcing rib that connects to the first transition portion and the end of the reinforcing rib that connects to the second transition portion and the surface of the first transition portion is 30°~60°; and / or, The angle between the line connecting the end of the reinforcing rib that connects to the first transition portion and the end of the reinforcing rib that connects to the second transition portion and the surface of the second transition portion is 30°~60°.

11. The battery according to claim 9 or 10, characterized in that, The first adapter also includes a third adapter connected to the first adapter portion, wherein the third adapter portion and the second adapter portion are located on opposite sides of the first adapter portion.

12. The battery according to claim 1, characterized in that, It also includes a third insulating layer, which is located between the first connector and the first side plate.

13. The battery according to claim 12, characterized in that, The first connector includes a fourth connecting piece that is connected to the side of the first tab opposite to the battery cell, and the third insulating layer includes a first portion located on the side of the fourth connecting piece opposite to the first tab.

14. The battery according to claim 13, characterized in that, The battery cell includes multiple stacked electrode sheets; The battery cell has a first side and a second side that are disposed opposite to each other; The third insulating layer further includes a second portion extending from one end of the first portion near the first surface of the battery cell toward the battery cell, and a third portion extending from one end of the first portion near the second surface of the battery cell toward the battery cell.

15. The battery according to claim 14, characterized in that, The projection of the first electrode tab in the thickness direction of the battery cell lies within the projection of the second portion of the third insulating layer in the thickness direction of the battery cell, and / or, The projection of the first electrode tab in the thickness direction of the battery cell lies within the projection of the third portion of the third insulating layer in the thickness direction of the battery cell; and / or, The projection of the first electrode tab in the length direction of the battery cell is located within the projection of the first portion of the third insulating layer in the length direction of the battery cell.

16. The battery according to claim 14 or 15, characterized in that, The second portion of the third insulating layer extends to the first surface of the battery cell and is bonded to the electrode sheet located on the first surface of the battery cell; and / or, The third portion of the third insulating layer extends to the second surface of the battery cell and is bonded to the electrode sheet located on the second surface of the battery cell.

17. The battery according to claim 1, characterized in that, A second insulating layer is provided between the first adapter and the battery cell.

18. The battery according to claim 17, characterized in that, The battery includes a plurality of stacked electrode sheets, and the battery cell has a first side and a second side disposed opposite to each other, wherein the second insulating layer extends to the first side of the battery cell and is bonded to the electrode sheet located on the first side of the battery cell, and / or the second insulating layer extends to the second side of the battery cell and is bonded to the electrode sheet located on the second side of the battery cell.

19. The battery according to claim 1, characterized in that, The end face of the battery cell on the side with the first tab is parallel to the thickness direction of the battery cell; and / or, The distance from the side of the first tab away from the battery cell to the side where the first tab connects to the battery cell is not greater than the length of the first adapter along the direction from the first side plate to the first tab; and / or, Along the direction from the first side plate to the first electrode tab, the length of the first adapter is 1mm-4mm; and / or, The first adapter is welded to the first side plate.

20. The battery according to claim 1, characterized in that, The battery cell is also provided with a second tab, the polarity of which is opposite to that of the first tab; The battery also includes a second adapter, which is electrically connected to the second tab. The second adapter is disposed between the first side plate and the battery cell, and the projection of the second adapter on the first side plate does not overlap with the projection of the second tab on the first side plate.

21. The battery according to claim 20, characterized in that, The housing includes a second side plate connected to the first side plate; The projection of the first electrode tab onto the second side plate at least partially overlaps with the projection of the second electrode tab onto the second side plate; and / or, The projection of the second adapter on the second side plate at least partially overlaps with the projection of the second electrode tab on the second side plate; and / or The projection of the first adapter on the second side plate at least partially overlaps with the projection of the second adapter on the second side plate.

22. The battery according to claim 20 or 21, characterized in that, The first electrode tab and the second electrode tab are located between the first adapter and the second adapter; and / or, The distance from the side of the second electrode tab away from the battery cell to the side of the second electrode tab that connects to the battery cell is not greater than the length of the second adapter along the direction from the first side plate to the second electrode tab; and / or, Along the direction from the first side plate to the second electrode tab, the length of the second adapter is 1mm-3mm; and / or, Along the direction from the first side plate to the second electrode tab, the length of the second adapter is less than the length of the first adapter.

23. The battery according to claim 1, characterized in that, The first electrode tab is either a negative electrode tab or a positive electrode tab; and / or, The battery cells include laminated cells or wound cells.

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