Battery

Abstract

The present invention provides a battery comprising: a housing enclosing a cavity; the housing including a first side plate; a battery cell located within the cavity, the battery cell being provided with a first tab; an external tab electrically connected to the first tab, the external tab being located on a side of the first side plate facing away from the cavity; the external tab including an outwardly protruding pole; the first side plate including a second through-hole corresponding to the pole; the pole being connected to the first tab via the second through-hole; and the pole increasing or decreasing in diameter along the direction from the first side plate toward the battery cell. The present invention can improve battery performance, including sealing and safety.

Description

Technical Field

[0001] The present invention relates to the field of electrochemical energy storage devices, and in particular to a battery. Background Art

[0002] At present, electrochemical devices represented by batteries are widely used. For example, lithium-ion batteries have the advantages of large capacity, small size, light weight and green environmental protection, and have been widely used in industries such as digital electronic products and electric vehicles.

[0003] With the development of science and technology, the requirements for battery sealing and safety performance are becoming higher and higher. Therefore, it is urgent to improve battery sealing and safety performance. Summary of the Invention

[0004] The present invention provides a battery capable of improving the sealing performance, safety and other performance of the battery.

[0005] The present invention provides a battery, comprising: a shell, which is arranged to form a cavity; the shell includes a first side plate; a battery cell, which is located in the cavity and is provided with a first pole lug; an external tab, which is electrically connected to the first pole lug, and the external tab is located on a side of the first side plate facing away from the cavity, the external tab includes a pole formed by outward protrusion, the first side plate includes a second through hole arranged corresponding to the pole, and the pole is connected to the first pole lug through the second through hole; along the direction from the first side plate to the battery cell, the diameter of the pole tends to increase or decrease.

[0006] According to one embodiment of the present invention, the battery further includes a first connecting member located between the first side plate and the battery cell, the first connecting member is electrically connected to the first electrode tab, the first connecting member is provided with a first through hole corresponding to the electrode column, and the electrode column is connected to the first connecting member through the first through hole.

[0007] According to one embodiment of the present invention, the first through hole of the first receiving member includes a first hole segment and a second hole segment connected to each other, and the second hole segment is located on a side of the first hole segment close to the battery cell; the end of the pole close to the battery cell extends outward to form an extension portion corresponding to the second hole segment.

[0008] According to one embodiment of the present invention, an end surface of the pole close to the battery cell is flush with a side surface of the first receiving member close to the battery cell.

[0009] According to one embodiment of the present invention, one end of the pole close to the battery cell extends out of the first through hole and extends outward along the circumference of the first through hole to form an extension portion connected to a side surface of the first receiving member close to the battery cell.

[0010] According to one embodiment of the present invention, a first insulating sheet is further provided between the external sheet and the first side plate, a second insulating sheet is further provided between the first connecting member and the first side plate, and the pole penetrates the first insulating sheet and the second insulating sheet; and / or, a first insulating layer is provided between the pole and the first side plate; and / or, a second insulating layer is provided between the first connecting member and the battery cell.

[0011] According to one embodiment of the present invention, the shell also includes a sixth side plate connected to the first side plate; the second insulating sheet includes a first insulating portion and a second insulating portion, the first insulating portion is located between the first socket and the first side plate, and the pole penetrates the first insulating portion; the second insulating portion is located between the first socket and the sixth side plate.

[0012] According to one embodiment of the present invention, the projection of the second insulating part on the sixth side panel covers the projection of the first supporting part on the sixth side panel; and / or, the projection of the first insulating part on the first side panel covers the projection of the first supporting part on the first side panel; and / or, the angle between the first insulating part and the second insulating part ranges from 80° to 120°.

[0013] According to one embodiment of the present invention, the projection of the first insulating sheet on the first side panel covers the projection of the external connecting sheet on the first side panel.

[0014] According to one embodiment of the present invention, the battery cell includes a plurality of stacked electrode sheets, and the battery cell has a first side surface and a second side surface arranged opposite to each other, wherein the second insulating layer extends to the first side surface of the battery cell and is bonded to the electrode sheet located on the first side surface of the battery cell, and / or the second insulating layer extends to the second side surface of the battery cell and is bonded to the electrode sheet located on the second side surface of the battery cell.

[0015] According to one embodiment of the present invention, a projection of the first receiving member on the first side plate does not overlap with a projection of the first electrode tab on the first side plate.

[0016] According to one embodiment of the present invention, the housing includes a second side plate connected to the first side plate, and a projection of the first receiving member on the second side plate at least partially overlaps with a projection of the first tab on the second side plate.

[0017] According to one embodiment of the present invention, the end face of the side on which the first pole tab is provided in the battery cell is parallel to the thickness direction of the battery cell; and / or, the distance from the side of the first pole tab away from the battery cell to the side where the first pole tab is connected to the battery cell is not greater than the length of the first supporting member along the direction from the first side plate to the first pole tab; and / or, the length of the first supporting member along the direction from the first side plate to the first pole tab is 1mm-3mm.

[0018] According to one embodiment of the present invention, the battery further includes a first middle piece located between the battery cell and the first side plate, and the first middle piece is connected to the first tab and the first receiving member respectively.

[0019] According to one embodiment of the present invention, the first intermediate member includes a first connecting piece connected to the first receiving member and a fourth connecting piece connected to a side of the first tab facing away from the battery cell.

[0020] According to one embodiment of the present invention, the first middle piece also includes a first connecting component respectively connected to the first connecting piece and the fourth connecting piece; the first connecting component includes a second connecting piece and a third connecting piece; the second connecting piece is located between the first socket and the battery cell; in the direction from the first socket to the first pole ear, the third connecting piece is located between the first pole ear and the first socket; the first connecting piece, the second connecting piece, the third connecting piece, and the fourth connecting piece are connected in sequence.

[0021] According to one embodiment of the present invention, the first connecting piece includes a first connecting portion connected to the first receiving member, and a second connecting portion extending along the extension direction of the first side plate, and the second connecting portion is connected to the fourth connecting piece.

[0022] 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 socket; and / or, a first angle is formed between a side of the first socket connected to the first connecting piece and a side of the fourth connecting piece connected to the first pole tab, and the first angle ranges from 80-120°; and / or, the first connecting piece is welded to the first socket; and / or, the battery cell includes a plurality of stacked electrode sheets, and a side of the first connecting piece connected to the first socket is parallel to the surface of the electrode sheet.

[0023] According to one embodiment of the present invention, the battery further includes a third insulating layer, and the third insulating layer is located between the first middle member and the first side plate.

[0024] According to one embodiment of the present invention, the third insulating layer includes a first portion located on a side of the fourth connecting piece facing away from the first electrode tab.

[0025] According to one embodiment of the present invention, the battery cell includes a plurality of stacked electrode sheets; the battery cell has a first side surface and a second side surface arranged opposite to each other; the third insulating layer also includes a second portion extending from an end of the first portion close to the first side surface of the battery cell toward the direction close to the battery cell, and a third portion extending from an end of the first portion close to the second side surface of the battery cell toward the direction close to the battery cell.

[0026] According to one embodiment of the present invention, the projection of the first electrode tab 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,

[0027] The projection of the first pole tab 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 pole 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.

[0028] According to one embodiment of the present invention, the second portion of the third 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 third portion of the third 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.

[0029] According to one embodiment of the present invention, the battery cell includes a plurality of stacked electrode sheets, the electrode sheets include a first current collector, and the first electrode tab is arranged on the first current collector; along the direction from the first socket to the battery cell, the distance between the first socket and the first current collector is less than 1 mm.

[0030] According to one embodiment of the present invention, the battery cell is further provided with a second pole tab, the polarity of the second pole tab is opposite to that of the first pole tab; the battery further includes a second socket, the second socket is electrically connected to the second pole tab, the second socket is arranged between the first side plate and the battery cell, and the projection of the second socket on the first side plate does not overlap with the projection of the second pole tab on the first side plate.

[0031] According to one embodiment of the present invention, the shell includes a second side plate connected to the first side plate, and the projection of the first pole tab on the second side plate at least partially overlaps with the projection of the second pole tab on the second side plate; and / or the projection of the second supporting member on the second side plate at least partially overlaps with the projection of the second pole tab on the second side plate.

[0032] According to one embodiment of the present invention, the battery further includes a first socket member located between the first side plate and the battery cell, the first socket member is electrically connected to the first pole tab, and the first pole tab and the second pole tab are located between the first socket member and the second socket member; and / or, the second socket member is welded to the first side plate; and / or, the distance from the side of the second pole tab away from the battery cell to the side where the second pole tab is connected to the battery cell is not greater than the length of the second socket member along the direction from the first side plate to the second pole tab; and / or, the length of the second socket member along the direction from the first side plate to the second pole tab is 1mm-4mm; and / or, the length of the second socket member along the direction from the first side plate to the second pole tab is equal to or greater than the length of the first socket member.

[0033] According to one embodiment of the present invention, the battery cell has a first surface and a second surface arranged opposite to each other, and a side surface located between the first surface and the second surface, and a protective adhesive layer is provided on at least a portion of at least one side surface of the battery cell.

[0034] According to one embodiment of the present invention, the battery cell includes a plurality of stacked electrode sheets, and the protective adhesive layer of the battery cell 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 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.

[0035] According to one embodiment of the present invention, the protective adhesive layer is provided with one or more fifth through holes.

[0036] According to one embodiment of the present invention, the first electrode tab is a positive electrode tab or a negative electrode tab; and / or the battery cell includes a laminated battery cell or a wound battery cell.

[0037] In the present invention, the first socket is electrically connected to the first tab, so that the external tab is connected to the first socket through the pole, thereby leading to the electrical properties of the first tab, wherein the control pole is a conical structure (that is, the diameter of the pole tends to increase or decrease along the direction from the first side plate to the first socket), which can improve the connection stability and sealing performance between the external tab, the first side plate, and the first socket, thereby improving the sealing, safety, stability and service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the connection structure between the first receiving member and the housing according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the connection structure between the first receiving member and the housing according to an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the connection structure between the first receiving member and the housing according to an embodiment of the present invention;

[0041] Figure 4 A schematic structural diagram of an external contact piece and a pole according to an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the connection structure between the first receiving member and the housing according to an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the connection structure between the first receiving member and the housing according to an embodiment of the present invention;

[0044] Figure 7 This is a schematic structural diagram of a second insulating sheet according to an embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram of the connection structure between the battery cell tab and the receiving member according to one embodiment of the present invention;

[0046] Figure 9 A schematic diagram illustrating the connection structure between the first electrode tab and the first receiving member according to an embodiment of the present invention;

[0047] Figure 10 A schematic diagram illustrating the connection structure of the first electrode tab, the first receiving member, and the third insulating layer according to an embodiment of the present invention;

[0048] Figure 11 This is a schematic diagram of a battery cell packaging structure according to an embodiment of the present invention;

[0049] Figure 12 This is a schematic diagram of a battery cell packaging structure according to an embodiment of the present invention;

[0050] Figure 13 FIG. 1 is a schematic diagram of a battery structure according to an embodiment of the present invention.

[0051] Explanation of reference numerals: 1: housing; 11: first side panel; 12: second side panel; 13: third side panel; 14: fourth side panel; 15: fifth side panel; 16: sixth side panel; 17: arc transition portion; 100: injection hole; 110: second through hole; 151: thinning portion; 2: battery cell; 21: first tab; 22: second tab; 31: first receiving member; 310: first through hole; 32: second receiving member; 41: external connecting piece; 42: pole; 43: extension portion; 51: first connecting piece; 511: first connecting portion; 512: second connecting portion; 52: second Connecting piece; 53: third connecting piece; 54: fourth connecting piece; 55: fifth connecting piece; 551: third connecting portion; 552: fourth connecting portion; 56: sixth connecting piece; 57: seventh connecting piece; 58: eighth connecting piece; 6: first insulating piece; 60: third through hole; 7: second insulating piece; 70: fourth through hole; 71: first insulating portion; 72: second insulating portion; 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: fifth through hole. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below. The specific embodiments listed below are only for describing the principles and features of the present invention. The examples are only used to explain 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 of ordinary skill in the art without making creative efforts are within the scope of protection of the present invention.

[0053] In the following description, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connected", "connected" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication connection (network connection); it can be a direct connection, an indirect connection through an intermediate medium, or the two elements can be internally connected. For ordinary technicians in this field, the specific meanings of the above-mentioned terms in the present invention can be understood according to the specific circumstances. In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", etc. are only used for descriptive purposes, such as distinguishing between the components to more clearly illustrate / explain the technical solution, and cannot be understood as indicating or implying the meaning of the number or order of the indicated technical features. In addition, the terms "parallel", "perpendicular", "equal", etc. are all approximate states. The numerical values and numerical ranges involved are approximate values. Due to the influence of specific operating processes such as measurement and manufacturing process, there may be a certain range of errors. These errors can be considered negligible by those skilled in the art.

[0054] Batteries are commonly used electrochemical energy storage devices, which generally include a shell, a battery cell encapsulated in a cavity surrounded by the shell, etc. The battery cell is provided with a tab (such as the first tab described below), and a conductive component (such as the external terminal provided with a pole described below) needs to penetrate the shell to electrically lead out the tab in the cavity to form the battery electrode. However, the connection structure of conventional conductive components has poor sealing performance.

[0055] In view of the above problems, an embodiment of the present invention provides a battery, such as Figures 1 to 13 As shown, the battery includes: a shell 1, which is enclosed to form a cavity; the shell 1 includes a first side plate 11; a battery cell 2, which is located in the cavity and is provided with a first pole ear 21; an external connecting piece 41, which is electrically connected to the first pole ear 21, and the external connecting piece 41 is located on the side of the first side plate 11 away from the cavity, and the external connecting piece 41 includes a pole 42 formed by outward protrusion, and the first side plate 11 includes a second through hole 110 corresponding to the pole 42, and the pole 42 is connected to the first pole ear 21 through the second through hole 110 (that is, penetrating the first side plate 11); along the direction from the first side plate 11 to the battery cell 2, the diameter of the pole 42 tends to increase or decrease, thereby improving the sealing performance of the battery.

[0056] Specifically, the pole 42 is generally formed to protrude outward along the thickness direction of the external tab 41, that is, the axial direction of the pole 42 is parallel to the thickness direction of the external tab 41. The cross-section of the pole 42 perpendicular to the axial direction of the pole 42 is circular, and the diameter of the pole 42 is the diameter of the cross-section of the pole 42 perpendicular to the axial direction of the pole 42. The pole 42 passes through the second through hole 110 to penetrate the first side plate 11.

[0057] In addition, the battery also includes a first socket 31 electrically connected to the first pole ear 21, and the first socket 31 is arranged between the first side plate and the battery cell 2; the first socket 31 is provided with a first through hole 310 corresponding to the pole 42, and the pole 42 is connected to the first socket 31 through the first through hole 310, and the second through hole 110 and the first through hole 310 can be coaxially arranged.

[0058] In addition, along the direction from the first side plate 11 to the first receiving member 31 (also the direction from the raw material external connecting piece 41 or the direction from the external electrode piece 41 to the first side plate 11 / first receiving member 31), the diameter of the pole 42 shows a changing trend (i.e., an increasing or decreasing trend). This change can be a gradual change, i.e., a uniform increase or decrease at substantially the same amplitude. The aperture (diameter) of the second through hole 110 and the first through hole 310 changes accordingly with the diameter of the pole 42. For example, along the direction from the first side plate 11 to the first receiving member 31, the diameter of the pole 42 gradually increases, at which point the apertures of the second through hole 110 and the first through hole 310 also gradually increase; along the direction from the first side plate 11 to the first receiving member 31, the diameter of the pole 42 gradually decreases, at which point the apertures of the second through hole 110 and the first through hole 310 also gradually decrease.

[0059] In some embodiments, as Figure 5 and Figure 6 As shown, the first through hole 310 of the first receiving member 31 includes a first hole segment and a second hole segment connected to each other, and the second hole segment is located on the side of the first hole segment close to the battery cell 2; the end of the pole 42 close to the battery cell 2 extends outward to form an extension portion 43 corresponding to the second hole segment.

[0060] Specifically, the first hole segment and the second hole segment can be coaxially arranged, and the first hole segment and the second hole segment are both 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 are connected. Preferably, the diameter of the second hole segment is larger than the diameter of the first hole segment, and the axial projection of the second hole segment perpendicular to the first through hole 310 can cover the axial projection of the first hole segment perpendicular to the first through hole 310.

[0061] In addition, the cross-sectional area of the external tab 41 perpendicular to the axial direction of the pole 42 can be larger than the cross-sectional area of the pole 42 perpendicular to the axial direction of the pole 42, the projection of the external tab 41 perpendicular to the axial direction of the pole 42 covers the projection of the pole 42 perpendicular to the axial direction of the pole 42, the cross-sectional area of the extension 43 perpendicular to the pole 42 is larger than the cross-sectional area of the pole 42 perpendicular to the axial direction of the pole 42, and the projection of the extension 43 perpendicular to the axial direction of the pole 42 covers the cross-sectional area of the pole 42 perpendicular to the axial direction of the pole 42. In the axial projection, the cross-sectional area of the external connecting piece 41 perpendicular to the axial direction of the pole 42 is larger than the cross-sectional area of the extension portion 43 perpendicular to the axial direction of the pole 42. The projection of the external connecting piece 41 perpendicular to the axial direction of the pole 42 covers the projection of the extension portion 43 perpendicular to the axial direction of the pole 42. The cross-sectional area of the extension portion 43 perpendicular to the axial direction of the pole 42 is substantially equal to the cross-sectional area of the second hole segment perpendicular to the axial direction of the pole 42. The extension portion 43 is engaged in the second hole segment and is connected to the side wall of the second hole segment.

[0062] like Figure 5 and Figure 6As shown, the end face of the pole 42 close to the battery cell 2 can be flush with the side surface of the first socket 31 close to the battery cell 2. Specifically, the thickness of the extension portion 43 along the axial direction of the first through hole 310 (also the axial direction of the pole 42) is substantially equal to the depth of the second hole segment along the axial direction of the first through hole 310. Thus, the extension portion 43 is snapped into the second hole segment, and the end face of the extension portion 43 close to the battery cell 2 is flush with the side surface of the first socket 31 facing the battery cell 2. This not only ensures the bonding strength between the pole 42 and the first socket 31, but also prevents the pole 42 from interfering with the connection between the first tab 21 or the first connecting piece 51 and the first socket 31.

[0063] In addition, one end of the pole 42 close to the battery cell 2 can also extend out of the first through hole 310, and extend outward along the circumference of the first through hole 310 to form an extension portion 43 that is connected to the side surface of the first socket 31 close to the battery cell 2, that is, the end surface of the pole 42 close to the battery cell 2 is not flush with the side surface of the first socket 31 facing the battery cell 2, but is located between the first socket 31 and the battery cell 2.

[0064] Among them, the epitaxial sheet, the pole 42, and the extension part 43 can be formed as one piece, which can be made of metal. In specific implementation, the first supporting member 31 and the first side plate 11 can be riveted together by rivets. After riveting, the rivet is located at one end of the first side plate 11 away from the cavity to form the external sheet 41, and the other end forms the extension part 43, and the part between the two ends forms the pole 42. The formed pole 42 is, for example, a conical structure.

[0065] In one embodiment, the first electrode tab 21 may be electrically connected to the housing 1 , and in this case, the external connecting piece 41 , the electrode post 42 , and the first receiving member 31 may be in direct contact with the housing 1 .

[0066] In another specific embodiment, the first electrode tab 21 is insulated from the housing 1 , and specifically, insulation can be achieved by providing an insulating sheet (insulating layer).

[0067] In some embodiments, as Figures 1 to 3 、 Figure 5 and Figure 6 、 Figure 13As shown, a first insulating sheet 6 is further provided between the external tab 41 and the first side plate 11, and a second insulating sheet 7 is further provided between the first connector 31 and the first side plate 11. That is, the external tab 41, the first insulating sheet 6, the first side plate 11, the second insulating sheet 7, and the first connector 31 are stacked in sequence, and the pole 42 penetrates the first insulating sheet 6 and the second insulating sheet 7. A first insulating layer 81 is provided between the pole 42 and the first side plate 11. Thus, the external tab 41, the pole 42, the first connector 31, and the first tab 21 are electrically connected, while being insulated from the first side plate 11 (housing 1). Along the circumference of the first through hole 310, the difference between the diameter of the first through hole 310 and the diameter of the pole 42 is substantially equal to the width of the first insulating layer 81 along the circumference of the first through hole 310. The circumference of the first through hole 310 is perpendicular to the axial direction of the first through hole 310. 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 side of the first insulating sheet 6 close to the first side plate 11 protruding outward (protruding into the second through hole 110); 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 side of the second insulating sheet close to the first side plate protruding outward (protruding into the second through hole 110).

[0068] Correspondingly, the first insulating sheet 6 is provided with a third through-hole 60, through which the pole 42 passes, thereby penetrating the first insulating sheet 6. The second insulating sheet 7 is provided with a fourth through-hole 70, through which the pole 42 passes, thereby penetrating the second insulating sheet 7. Specifically, the pole 42 sequentially passes through the third through-hole 60, the second through-hole 110, the fourth through-hole 70, and the first through-hole 310 to connect with the first connector 31. The third through-hole 60, the second through-hole 110, the fourth through-hole 70, and the first through-hole 310 can be coaxially arranged.

[0069] like Figures 1 to 3 As shown, Figure 5 and Figure 6 、 Figure 13 As shown, the projection of the first insulating sheet 6 on the first side plate 11 can cover the projection of the external sheet 41 on the first side plate 11 (i.e., the projection of the external sheet 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 external sheet 41 from contacting the housing 1 and ensuring the insulation of the housing. In addition, the projection of the second insulating sheet 7 on the first side plate 11 can cover the projection of the first receiving member 31 on the first side plate 11 (i.e., the projection of the first receiving member 31 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 first receiving member 31 from contacting the housing 1 and ensuring the insulation of the housing. As a result, battery safety, stability and other performance can be further improved.

[0070] like Figure 5 and Figure 7As shown, the shell 1 also includes a sixth side plate 16 connected to the first side plate 11, and the second insulating sheet 7 can be an L-shaped structure, which includes a first insulating portion 71 and a second insulating portion 72 connected to each other. The first insulating portion 71 is located between the first socket 31 and the first side plate 11, and the pole 42 penetrates the first insulating portion 71, that is, the first insulating portion 71 is provided with a fourth through hole 70 corresponding to the pole 42, and the second insulating portion 72 is located between the first socket 31 and the sixth side plate 16. Therefore, through the second insulating portion 72, support can be provided for the first socket 31, and the first socket 31 can be insulated from the sixth side plate 16 of the shell 1, thereby improving the safety and stability of the battery.

[0071] Among them, the projection of the first insulating part 71 on the first side panel 11 can cover the projection of the first socket part 31 on the first side panel 11 (that is, the projection of the first socket part 31 on the first side panel 11 is within the projection of the first insulating part 71 on the first side panel 11), and the projection of the second insulating part 72 on the sixth side panel 16 can cover the projection of the first socket part 31 on the sixth side panel 16 (that is, the projection of the first socket part 31 on the sixth side panel 16 is within the projection of the second insulating part 72 on the sixth side panel 16) to prevent the first socket part 31 from contacting the first side panel 11 or the sixth side panel 16.

[0072] Among them, the surface of the sixth side plate 16 is parallel to the surface of the electrode sheet; the sixth side plate 16 is not parallel to the surface of the first side plate 11, for example, perpendicular; the sixth side plate 16 is not parallel to the surface of the second side plate 12, for example, perpendicular; the sixth side plate 16 can be, for example, a bottom side plate (or bottom plate).

[0073] In addition, an angle is formed between a side of the first insulating portion 71 that is in contact with the first receiving member 31 and a side of the second insulating portion 72 that is in contact with the first receiving member 31. The angle may range from 80° to 140°, for example, 80°, 90°, 100°, 110°, 120°, 130°, 140°, etc., that is, the two are not parallel, for example, perpendicular. The angle formed between the first insulating portion 71 and the second insulating portion 72 (the planes in which the two are located) may range from 80° to 140°, for example, 80°, 90°, 100°, 110°, 120°, 130°, 140°, etc., that is, the two are not parallel, for example, perpendicular.

[0074] like Figures 11 to 13As shown, the projection of the first socket 31 on the first side plate 11 does not overlap with the projection of the first pole tab 21 on the first side plate 11 (that is, the projection of the first socket 31 parallel to the extension direction of the first side plate 11 does not overlap with the projection of the first pole tab 21 parallel to the extension direction of the first side plate 11). Therefore, the first pole tab 21 and the first socket 31 are not distributed along the direction from the battery cell 2 to the first side plate 11. Specifically, in the direction from the first side plate 11 to the battery cell 2, the distance from the first side plate 11 to the battery cell 2 is a1, and the distance from the side of the first pole tab 21 connected to the battery cell 2 to the side of the first pole tab 21 away from the battery cell 2 ( The distance from the side of the first connector 31 facing the battery cell 2 (that is, the side facing away from the first side plate 11) to the side of the first connector 31 facing the first side plate 11 (that is, the length of the first connector 31 in the direction from the first side plate 11 to the battery cell 2) is c1, a1<b1+c1. Therefore, compared with the existing technology in which the tabs and the connectors are arranged along the length direction of the shell, the technical solution of this embodiment can make full use of the space between the battery cell and the first side plate, save cavity space, thereby increasing the size of the battery cell and improving the energy density and other performance of the battery.

[0075] In this embodiment, the extension direction of the first side plate 11 is parallel to the surface of the first side plate 11, the direction from the first side plate 11 to the battery cell 2 can be parallel to the length direction of the housing 1, and the extension direction of the first side plate 11 can be the width direction of the housing 1 or the thickness direction of the housing 1. For example, Figure 13 As shown, the extending direction of the first side plate 11 is the width direction of the housing 1 .

[0076] 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 a plurality of stacked electrode sheets, and the electrode sheets 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.

[0077] like Figures 11 to 13 As shown, the shell 1 includes a second side plate 12 connected to the first side plate 11, and the projection of the first socket 31 on the second side plate 12 at least partially overlaps with the projection of the first pole ear 21 on the second side plate 12 (that is, the projection of the first socket 31 perpendicular to the extension direction of the first side plate 11 at least partially overlaps with the projection of the first pole ear 21 perpendicular to the extension direction of the first side plate 11), that is, the first socket 31 and the first pole ear 21 are distributed along the extension direction of the first side plate 11, thereby facilitating the connection between the first socket 31 and the first pole ear 21, further saving cavity space, and improving the energy density and other performance of the battery.

[0078] Specifically, the surface of the second side plate 12 can be perpendicular to the surface of the first side plate 11, the surface of the second side plate 12 is perpendicular to the surface of the sixth side plate 16, and the surface of the second side plate 12 is perpendicular to the surface of the electrode sheet (parallel to the thickness direction of the electrode sheet).

[0079] In some specific embodiments, Figures 11 to 13 As shown, the projection of the first receiving member 31 perpendicular to the width direction of the battery cell 2 at least partially overlaps with the projection of the first tab 21 perpendicular to the width direction of the battery cell 2 , that is, the first receiving member 31 and the first tab 21 are distributed along the width direction of the battery cell 2 .

[0080] In some embodiments, the distance from the side of the first pole tab 21 away from the battery cell 2 to the side where the first pole tab 21 is connected to the battery cell 2 is not greater than the length of the first supporting member 31 along the direction from the first side plate 11 to the first pole tab 21 (that is, the length of the first supporting member 31 along the direction from the first side plate 11 to the first pole tab 21), that is, the overlapping area of the projection of the first supporting member 31 on the second side plate 12 and the projection of the first pole tab 21 on the second side plate 12 is increased, thereby achieving protection for the first pole tab 21 in the width direction of the battery cell and preventing the first pole tab 21 from falling off during the falling or collision of the battery. At the same time, the area of the electrode sheet of the battery cell can be further expanded, which is conducive to further improving the battery energy density and other performance.

[0081] In some embodiments, a length c1 of the first receiving member 31 in a direction from the first side plate 11 to the first tab 21 is 1 mm-3 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0082] Specifically, the first supporting member 31 can be block-shaped (or called a first adapter block), and its thickness direction can be parallel to the direction from the first side plate 11 to the first pole ear 21, that is, the length of the first supporting member 31 along the direction from the first side plate 11 to the first pole ear 21 is the thickness of the first supporting member 31.

[0083] In addition, the above-mentioned battery can also include a first middle piece located between the battery cell 2 and the first side plate 11, and the first middle piece is respectively connected to the first pole ear 21 and the first socket 31 (that is, the first socket 31 is connected to the first pole ear 21 through the first middle piece). Specifically, the first socket 31, the first middle piece, and the first pole ear 21 can be welded in sequence.

[0084] Specifically, the first intermediate member may include a first connecting piece 51 connected to the first receiving member 31 and a fourth connecting piece 54 connected to a side of the first tab 21 facing away from the battery cell 2 .

[0085] like Figures 8 to 11As shown, the first intermediate member can have a bending structure, the first connecting piece 51 is connected to the first supporting member 31, and the fourth connecting piece 54 is connected to the first pole ear 21, which can be specifically welded, and a first angle is formed between the side of the first supporting member 31 connected to the first connecting piece 51 and the side of the fourth connecting piece 54 connected to the first pole ear 21, and the range of the first angle is 80-140°, for example, 80°, 90°, 100°, 120°, 130°, 140°, etc., that is, the side of the first supporting member 31 connected to the first connecting piece 51 and the side of the fourth connecting piece 54 connected to the first pole ear 21 are not parallel, for example, vertical. Thus, the contact surfaces between the first socket 31 and the first connecting piece 51 and the contact surfaces between the fourth connecting piece 54 and the first pole lug 21 are staggered so that the two contact surfaces are basically arranged along the width direction of the battery cell. This not only reduces the space occupied by the first socket 31 and the first connecting piece 51 in the cavity, but also ensures that the connection between the first socket 31 and the first connecting piece 51 and the connection between the fourth connecting piece 54 and the first pole lug 21 do not interfere with each other. It can also further improve the stability of the connection between the first socket 31 and the first pole lug 21 through the first intermediate piece, thereby improving the stability, safety, service life and other qualities of the battery.

[0086] In addition, a third angle is formed between a surface of the first receiving member 31 that is in contact with the first connecting piece 51 and a surface of the first receiving member 31 that faces the first side panel 11. The third angle ranges from 80° to 140°, for example, 80°, 90°, 100°, 120°, 130°, or 140°, meaning that the two surfaces are not parallel and may be, for example, perpendicular. The surface of the first receiving member 31 that is in contact with the first connecting piece 51 is, for example, the top surface of the first receiving member 31.

[0087] In addition, the battery core 2 includes a plurality of stacked electrode sheets, and a surface of the first connecting sheet 51 that is in contact with the first receiving member 31 may be parallel to the surface of the electrode sheet.

[0088] In some embodiments, as Figure 8 As shown, the first intermediate piece also includes a first connecting component connected to the first connecting piece 51 and the fourth connecting piece 54 respectively, and the first connecting component includes a second connecting piece 52 and a third connecting piece 53. The second connecting piece 52 is located between the first socket 31 and the battery cell 2; in the direction from the first socket 31 to the first pole ear 21, the third connecting piece 53 is located between the first socket 31 and the first pole ear 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.

[0089] Specifically, the first intermediate piece has a multiple-bending structure, and 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, vertical. The surface of the second connecting piece 52 is not parallel to the surface of the third connecting piece 53, and can be vertical or non-vertical. The surface of the fourth connecting piece 54 is parallel to the surface of the second connecting piece 52. Therefore, by setting the multiple-bent first connecting piece 51, the second connecting piece 52, the third connecting piece 53 and the fourth connecting piece 54 to prevent the first intermediate piece from shaking in the left and right directions and the front and back directions, the stability of the connection between the first receiving piece 31 and the first pole ear 21 can be further improved.

[0090] In other embodiments, Figures 9 to 12 As shown, the first connecting piece 51 includes a first connecting portion 511 connected to the first socket 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 socket 31 to the first pole ear 21), and the second connecting portion 512 is connected to the fourth connecting piece 54.

[0091] Among them, the first connecting portion 511 and the second connecting portion 512 are located on the same side of the first socket 31 and also on the same side of the first pole ear 21. The first connecting portion 511 can be specifically located on the side of the first socket 31 away from the sixth side plate 16 (the side facing the fifth side plate 15), and the second connecting portion 512 can be specifically located on the side of the first pole ear 21 away from the sixth side plate 16. The angle formed between the side of the second connecting portion 512 facing the first pole ear 21 and the side where the fourth connecting piece 54 is connected to the second pole ear 22 can be in the range of 80-140°, for example, 80°, 90°, 100°, 120°, 130°, 140°, that is, the two are not parallel, for example, vertical.

[0092] 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 substantially flush, that is, the first connecting piece 51 can be a straight structure without a significant bend, but 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.

[0093] In addition, the first connecting piece 51 and the first socket 31 may be welded, and a weld mark may be formed on the side of the first connecting piece 51 facing away from the first socket 31. Specifically, when the first connecting piece 51 includes the first connecting portion 511 and the second connecting portion 512, the first connecting portion 511 and the first socket 31 may be welded, and a weld mark may be formed on the side of the first connecting portion 511 facing away from the first socket 31. Specifically, the projection of the first socket 31 in the thickness direction of the battery cell 2 and the projection of the first connecting piece 51 in the thickness direction of the battery cell 2 overlap, and the welding area between the two is located within this overlapping area.

[0094] like Figure 13 As shown, a sixth insulating layer 86 is further 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 receiving member 31 .

[0095] like Figures 10 to 13 As shown, the battery may further include a third insulating layer 83 located between the first middle member and the first side plate 11. Specifically, the third insulating layer 83 may include a first portion located on a side of the fourth connecting piece 54 facing away from the first tab 21.

[0096] 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 arranged opposite to each other, and the third insulating layer 83 also includes a second part extending from an end of the first part close to the first side of the battery cell 2 toward the direction close to the battery cell 2 and a third part extending from an end of the first part close to the second side of the battery cell 2 toward the direction close to the battery cell 2.

[0097] like Figures 10 to 13 As shown, the second part, the first part and the third part of the third insulating layer 83 are connected in sequence and are arranged to form a first groove. The bottom wall of the first groove is the first part of the third insulating layer 83, and the side walls are the second part and the third part of the third insulating layer 83 respectively. The first pole ear 21 and the part where the first middle piece is connected to the first pole ear 21 (such as the fourth connecting piece 54 and the second connecting part 512 of the first connecting piece 51 located on the side of the first pole ear 21) are located in the first groove and are covered by the third insulating layer 83, thereby preventing the first pole ear 21 or the first connecting piece 51 from contacting the shell, and at the same time protecting the first pole ear 21 and the first middle piece, preventing the first pole ear 21 and the first middle piece from colliding with the shell during the battery falling process, thereby further improving the stability and safety of the battery.

[0098] Specifically, the first tab 21 has a first side surface and a second side surface opposite to each other. The first side surface of the first tab 21 and the second side surface of the first tab 21 are respectively located on opposite sides of a side where the first tab 21 is connected to the fourth connecting piece 54 (i.e., a side of the first tab 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., Figure 8 As shown), the third insulating layer 83 includes a first portion located on a side of the fourth connecting piece 54 away from the first tab 21, a second portion located on the first side of the first tab 21, and a third portion located on the second side of the first tab 21; when the first connecting piece 51 of the first intermediate member includes a first connecting portion 511 and a second connecting portion 512 (as shown), Figures 9 to 12 As shown), the second connecting portion 512 extends to the first side of the first pole lug 21, and the third insulating layer 83 includes a first portion located on a side of the fourth connecting piece 54 away from the first pole lug 21, a second portion located on a side of the second connecting portion 512 away from the first pole lug 21, and a third portion located on a side (second side) of the first pole lug 21 away from the second connecting portion 512.

[0099] In some embodiments, as Figures 10 to 13 As shown, the projection of the first electrode tab 21 in the thickness direction of the battery cell 2 (i.e., the projection is perpendicular to the thickness direction of the battery cell 2) is located within the projection of the second portion of the third insulating layer 83 in the thickness direction of the battery cell 2, the projection of the first electrode tab 21 in the thickness direction of the battery cell 2 is located within the projection of the third portion of the third insulating layer 83 in the thickness direction of the battery cell 2, and the projection of the first electrode tab 21 in the length direction of the battery cell 2 (i.e., the projection is perpendicular to the length direction of the battery cell 2) is located within the projection of the first portion of the third insulating layer 83 in the length direction of the battery cell 2, that is, the third insulating layer 83 completely covers the first electrode tab 21 and the portion where the first intermediate member connects to the first electrode tab 21. The directions from the second portion to the first electrode tab 21, the third portion to the first electrode tab 21, the second portion to the third portion, and the thickness direction of the battery cell 2 may be parallel, and the direction from the first portion to the first electrode tab 21 is parallel to the length direction of the battery cell 2.

[0100] In some preferred embodiments, Figure 12 As shown, the second portion of the third insulating layer 83 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 electrode sheet close to the shell 1), and the third portion of the third insulating layer 83 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 (the electrode sheet close to the shell 1). Thus, the third insulating layer 83 is wrapped around the side of the battery cell 2, which can further improve the stability of the battery cell 2.

[0101] like Figure 8 、 Figure 11 and Figure 12 As shown, a second insulating layer 82 may be further provided between the first connector 31 and the battery cell 2 to prevent the first connector 31 from contacting and short-circuiting with electrode sheets of opposite polarity in the battery cell 2. Specifically, when the first connector 31 has a second connecting sheet 52, the second insulating layer 82 is located between the second connecting sheet 52 of the first intermediate member and the battery cell 2.

[0102] In some embodiments, as Figure 8 and Figure 12 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 is wrapped 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.

[0103] In some embodiments, the battery cell 2 includes a plurality of stacked electrode sheets, the electrode sheets include a first electrode sheet, the first electrode sheet includes a first current collector, and the first pole tab 21 is arranged on the first current collector; along the direction from the first socket 31 to the battery cell 2, the distance between the first socket 31 and the first current collector is less than 1 mm, that is, the distance between the first socket 31 and the first current collector in the direction from the first socket 31 to the battery cell 2 is less than 1 mm, thereby further shortening the space occupied by the first socket 31 and the first pole tab 21, improving the space utilization of the cavity, expanding the occupied area of the electrode sheet, and enhancing the energy density of the battery cell.

[0104] The battery cell 2 is also provided with a second pole tab 22, and the polarity of the second pole tab 22 is opposite to that of the first pole tab 21; the battery also includes a second socket 32, the second socket 32 is electrically connected to the second pole tab 22, and the second socket 32 is arranged between the first side plate 11 and the battery cell 2, and the projection of the second socket 32 on the first side plate 11 does not overlap with the projection of the second pole tab 22 on the first side plate 11 (that is, the projection of the second socket 32 parallel to the extension direction of the first side plate 11 does not overlap with the projection of the second pole tab 22 parallel to the extension direction of the first side plate 11).

[0105] Therefore, the second pole ear 22 and the second socket member 32 are not distributed along the direction from the battery cell 2 to the first side plate 11. Specifically, in the direction from the first side plate 11 to the battery cell 2, the distance from the first side plate 11 to the battery cell 2 is a1, the distance from the side where the second pole ear 22 is connected to the battery cell 2 to the side of the second pole ear 22 away from the battery cell 2 (that is, the side facing the first side plate 11) is b2, and the distance from the side of the second socket member 32 facing the battery cell 2 (that is, the side away from the first side plate 11) to the side of the second socket member 32 facing the first side plate 11 (that is, the length of the second socket member 32 in the direction from the first side plate 11 to the battery cell 2) is c2, a1<b2+c2, thereby further saving cavity space and improving the energy density and other performance of the battery.

[0106] Among them, b2 and b1 can be equal or different, and c2 and c1 can be equal or different.

[0107] Specifically, the projections of the first electrode tab 21 , the second electrode tab 22 , the first receiving member 31 , and the second receiving member 32 on the first side plate do not overlap with each other.

[0108] like Figures 11 to 13 As shown, the projection of the second supporting member 32 on the second side plate 12 at least partially overlaps with the projection of the second pole ear 22 on the second side plate 12 (that is, the projection of the second supporting member 32 perpendicular to the extension direction of the first side plate 11 at least partially overlaps with the projection of the second pole ear 22 perpendicular to the extension direction of the first side plate 11). In other words, the second supporting member 32 and the second pole ear 22 are arranged along the extension direction of the first side plate, and specifically can be arranged in the width direction of the battery cell, thereby facilitating the connection between the second supporting member 32 and the second pole ear 22, further saving cavity space, and improving the energy density and other performance of the battery.

[0109] In addition, the projection of the first pole tab 21 on the second side plate 12 at least partially overlaps with the projection of the second pole tab 22 on the second side plate 12 (i.e., the projection of the first pole tab 21 perpendicular to the extension direction of the first side plate 11 at least partially overlaps with the projection of the second pole tab 22 perpendicular to the extension direction of the first side plate 11). The projection of the first socket 31 on the second side plate 12 at least partially overlaps with the projection of the second socket 32 on the second side plate 12.

[0110] Specifically, if Figures 11 to 13 As shown, the projection of the first pole tab 21 perpendicular to the width direction of the battery cell 2 at least partially overlaps with the projection of the second pole tab 22 perpendicular to the width direction of the battery cell 2, and the projection of the second supporting member 32 perpendicular to the width direction of the battery cell 2 at least partially overlaps with the projection of the second pole tab 22 perpendicular to the width direction of the battery cell 2.

[0111] In addition, the first pole tab 21 and the second pole tab 22 can be located between the first receiving member 31 and the second receiving member 32, thereby making full use of the space between the first receiving member 31 and the second receiving member 32, further expanding the size of the electrode sheet of the battery cell 2 in the length direction, and improving the energy density of the battery cell. For example, in the direction parallel to the direction from the first receiving member 31 to the first pole tab 21, the first pole tab 21 and the second pole tab 22 are located between the first receiving member 31 and the second receiving member 32, that is, the first receiving member 31, the first pole tab 21, the second pole tab 22, and the second receiving member 32 can be arranged in sequence. For example, the first receiving member 31, the first pole tab 21, the second pole tab 22, and the second receiving member 32 can be arranged in sequence in the width direction of the battery cell 2, and the first receiving member 31, the first pole tab 21, the second pole tab 22, and the second receiving member 32 can be arranged substantially coaxially.

[0112] However, the present invention is not limited thereto. In other embodiments, the first receiving member 31 and the second receiving member 32 may be located between the first electrode tab 21 and the second electrode tab 22 .

[0113] In addition, the first socket 31, the first pole lug 21, the second pole lug 22, and the second socket 32 generally do not extend out from 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), and do not extend out from the outer edge of the battery cell 2 in the thickness direction or the width direction of the battery cell 2, that is, the projection of the battery cell 2 on the first side plate 11 covers the projection of the first socket 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 pole lug 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 pole lug 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 socket 32 on the first side plate 11.

[0114] In some embodiments, the distance from the side of the second pole tab 22 away from the battery cell 2 to the side where the second pole tab 22 is connected to the battery cell 2 is not greater than the length of the second receiving member 32 in the direction along the first side plate 11 to the second pole tab 22, which is beneficial to further improve the energy density and other performance of the battery.

[0115] Specifically, the second supporting member 32 can be block-shaped (or called a second adapter block), and its thickness direction can be parallel to the direction from the first side plate 11 to the second pole ear 22, that is, the length of the second supporting member 32 along the direction from the first side plate 11 to the second pole ear 22 is the thickness of the second supporting member 32.

[0116] Generally, the direction from the first side plate 11 to the first electrode tab 21 , the direction from the first side plate 11 to the second electrode tab 22 , and the direction from the first side plate 11 to the battery cell 2 are parallel.

[0117] In some embodiments, a length c2 of the second receiving member 32 in a direction from the first side plate 11 to the second tab 22 is 1 mm to 4 mm, for example, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc.

[0118] Specifically, c2 can be greater than, equal to or less than c1, preferably c2≥c1, and further preferably c2>c1. Specifically, when the first pole tab 21 is insulated from the shell 1, a second insulating sheet 7 is provided between the first socket 31 and the first side plate 11, and the second socket 32 can be welded to the first side plate 11. At this time, c2>c1, and the difference between the two (L2-L1) can be basically equal to the thickness of the second insulating sheet 7; when the first pole tab 21 is electrically connected to the shell 1, and the second pole tab 22 is insulated from the shell 1, the second insulating sheet 7 may not be provided between the first socket 31 and the first side plate 11, and the two are in direct contact, and a second insulating sheet 7 may be provided between the second socket 32 and the first side plate 11 (the second socket 32 and the shell are in direct contact). The connection structure of the first connector 31 and the housing 1 can be similar to the connection structure of the first connector 31 and the housing 1 via the pole 42, which will not be repeated here. In this case, c2 is less than c1, and the difference between the thicknesses of the two (c1-c2) can be substantially equal to the thickness of the second insulating sheet 7. When the first and second tabs 21 and 22 are both insulated from each other and connected to the housing 1, a second insulating sheet 7 is provided between the first connector 31 and the first side plate 11, and between the second connector 32 and the first side plate 11, respectively (the connection structure of the second connector 32 and the housing 1 can be similar to the connection structure of the first connector 31 and the housing 1 via the pole 42, which will not be repeated here). In this case, c2 = c1. This can further save cavity space and improve battery performance, such as energy density.

[0119] The second tab 22 can be electrically connected to the shell 1 , that is, the shell 1 , the second socket 32 , and the second tab 22 are electrically connected. The second socket 32 can be welded to the second tab 22 and the shell 1 , specifically to the first side plate 11 of the shell 1 .

[0120] The above-mentioned battery may also include a second middle piece located between the battery cell 2 and the first side plate 11, and the second middle piece is respectively connected to the second pole tab 22 and the second socket 32 (that is, the second socket 32 is connected to the second pole tab 22 through the second middle piece). Specifically, the second socket 32, the second middle piece, and the second pole tab 22 can be welded in sequence.

[0121] Specifically, the second intermediate member may include a fifth connecting piece 55 connected to the second receiving member 32 and an eighth connecting piece 58 connected to the side of the second tab 22 facing away from the battery cell 2. Figures 8 to 12As shown, the second intermediate piece can have a bending structure, the fifth connecting piece 55 is connected to the second supporting piece 32, and the eighth connecting piece 58 is connected to the second pole ear 22, which can be specifically welded, and a second angle is formed between the side of the second supporting piece 32 connected to the fifth connecting piece 55 and the side of the eighth connecting piece 58 connected to the second pole ear 22. The range of the second angle is 80-140°, for example, 80°, 90°, 100°, 120°, 130°, 140°, etc., that is, the two are not parallel, for example, vertical, thereby further improving the stability of the connection between the second supporting piece 32 and the second pole ear 22 through the second intermediate piece, thereby improving the stability, safety and service life of the battery.

[0122] In addition, a fourth angle is formed between the side of the second supporting member 32 connected to the fifth connecting piece 55 and the side of the second supporting member 32 facing the first side panel 11. The range of the fourth angle is 80-140°, for example, 80°, 90°, 100°, 120°, 130°, 140°, etc., that is, the two are not parallel, for example, they can be perpendicular.

[0123] In addition, the battery core 2 includes a plurality of stacked electrode sheets, and a surface of the fifth connecting sheet 55 that is in contact with the second receiving member 32 is parallel to the surface of the electrode sheet.

[0124] In some embodiments, as Figure 8 As shown, the second intermediate piece also includes a second connecting component connected to the fifth connecting piece 55 and the eighth connecting piece 58 respectively, and the second connecting component includes a sixth connecting piece 56 and a seventh connecting piece 57. The sixth connecting piece 56 is located between the second socket part 32 and the battery cell 2; in the direction from the second socket part 32 to the second pole ear 22, the seventh connecting piece 57 is located between the second socket part 32 and the second pole ear 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.

[0125] Specifically, the second intermediate piece has a multiple bending structure, and its fifth connecting piece 55 is connected to the eighth connecting piece 58 through the sixth connecting piece 56 and the seventh connecting piece 57 in sequence. The surface of the fifth connecting piece 55 is not parallel to the surface of the sixth connecting piece 56, for example, vertical. The surface of the sixth connecting piece 56 is not parallel to the surface of the seventh connecting piece 57, and can be vertical or non-vertical. The surface of the eighth connecting piece 58 can be parallel to the surface of the sixth connecting piece 56, thereby further improving the stability of the connection between the second receiving piece 32 and the second pole ear 22.

[0126] In other embodiments, Figures 9 to 12As shown, the fifth connecting piece 55 includes a third connecting portion 551 connected to the second socket 32, and a fourth connecting portion 552 extending along the extension direction of the first side plate 11 (such as the direction from the second socket 32 to the second pole tab 22). The fourth connecting portion 552 is connected to the eighth connecting piece 58. The third connecting portion 551 and the fourth connecting portion 552 are located on the same side of the second socket 32 and the same side of the second pole tab 22. The third connecting portion 551 can be specifically located on the side of the second socket 32 away from the sixth side plate 16, and the fourth connecting portion 552 can be specifically located on the side of the second pole tab 22 away from the sixth side plate 16. The side of the fourth connecting portion 552 facing the second pole tab 22 is not parallel to the side of the eighth connecting piece 58 connected to the second pole tab 22, and is, for example, perpendicular.

[0127] Specifically, the third connecting portion 551 and the fourth connecting portion 552 can be integrally formed to form the fifth connecting piece 55. The surfaces of the third connecting portion 551 and the fourth connecting portion 552 can be flush, that is, the fifth connecting piece 55 can be a straight structure without a significant bend, but 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. That is, the surface of the fifth connecting piece 55 that connects to the second receiving member 32 and the surface of the eighth connecting piece 58 that connects to the second terminal tab 22 are not parallel, for example, they are perpendicular.

[0128] In addition, the fifth connecting piece 55 and the second socket 32 may be welded, and a weld mark is formed on the side of the fifth connecting piece 55 facing away from the second socket 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 socket 32 may be welded, and a weld mark is formed on the side of the third connecting portion 551 facing away from the second socket 32.

[0129] In addition, a sixth insulating layer 86 is further 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 receiving member 32. Figure 13 As shown, the sixth insulating layer 86 can extend from the first connecting piece 51 to the fifth connecting piece 55, specifically, it can extend from the end of the first connecting piece 51 facing away from the fifth connecting piece 55 to the end of the fifth connecting piece 55 facing away from the first connecting piece 51, covering the first connecting piece 51 and the fifth connecting piece 55.

[0130] In addition, if Figures 10 to 13 As shown, a fourth insulating layer 84 may be further included, and the fourth insulating layer 84 is located between the second middle member and the first side plate 11. Specifically, the fourth insulating layer 84 may include a fourth portion located on a side of the eighth connecting piece 58 facing away from the second tab 22.

[0131] In some embodiments, the fourth insulating layer 84 also includes a fifth portion extending from an end of the fourth portion close to the first surface of the battery cell 2 toward the battery cell 2 and a sixth portion extending from an end of the fourth portion close to the second surface of the battery cell 2 toward the battery cell 2.

[0132] like Figures 10 to 13 As shown, the fifth part, the fourth part and the sixth part of the fourth insulating layer 84 are connected in sequence and are arranged to form a second groove. The bottom wall of the second groove is the fourth part of the fourth insulating layer 84, and the side walls are the fifth part and the sixth part of the fourth insulating layer 84 respectively. The second pole ear 22 and the part where the second intermediate piece is connected to the second pole ear 22 (such as the eighth connecting piece 58 and the fifth connecting piece 55 are located on the side of the second pole ear 22. The fourth connecting portion 552) is located in the second groove and is covered by the fourth insulating layer 84. This can further improve the stability, safety and other performance of the battery.

[0133] Specifically, the second tab 22 has a first side surface and a second side surface opposite to each other, and the first side surface of the second tab 22 and the second side surface of the second tab 22 are respectively located on opposite sides of a side where the second tab 22 is connected to the eighth connecting piece 58. When the fifth connecting piece 55 and the eighth connecting piece 58 of the second intermediate piece are connected through the second connecting assembly (i.e., the sixth connecting piece 56 and the seventh connecting piece 57) (e.g., Figure 8 As shown), the fourth insulating layer 84 includes a fourth portion located on a side of the eighth connecting piece 58 facing away from the second pole tab 22, a fifth portion located on the first side of the second pole tab 22, and a sixth portion located on the second side of the second pole tab 22; when the fifth connecting piece 55 of the second intermediate piece includes a third connecting portion 551 and a fourth connecting portion 552 (as shown), Figures 9 to 12 As shown), the fourth connecting portion 552 extends to the first side of the second pole tab 22, and the fourth insulating layer 84 includes a fourth portion located on the side of the eighth connecting piece 58 away from the second pole tab 22, a fifth portion located on the side of the fourth connecting portion 552 away from the second pole tab 22, and a sixth portion located on the side (second side) of the second pole tab 22 away from the fourth connecting portion 552.

[0134] In some embodiments, as Figures 10 to 13As shown, the projection of the second electrode tab 22 in the thickness direction of the battery cell 2 is located within the projection of the fifth portion of the fourth insulating layer 84 in the thickness direction of the battery cell 2, the projection of the second electrode tab 22 in the thickness direction of the battery cell 2 is located within the projection of the sixth portion of the fourth insulating layer 84 in the thickness direction of the battery cell 2, and the projection of the second electrode tab 22 in the length direction of the battery cell 2 is located within the projection of the fourth portion of the fourth insulating layer 84 in the length direction of the battery cell 2. That is, the fourth insulating layer 84 completely covers the second electrode tab 22 and the portion where the second intermediate member connects to the second electrode tab 22. The directions from the fifth portion to the second electrode tab 22, the sixth portion to the second electrode tab 22, the fifth portion to the sixth portion, and the thickness direction of the battery cell 2 may be parallel, and the direction from the fourth portion to the second electrode tab 22 is parallel to the length direction of the battery cell 2.

[0135] In some preferred embodiments, Figure 12 As shown, the fifth portion of the fourth insulating layer 84 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, and the sixth portion of the fourth insulating layer 84 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. Thus, the fourth insulating layer 84 is wrapped around the side of the battery cell 2, which can further improve the stability of the battery cell 2.

[0136] like Figure 8 、 Figure 11 and Figure 12 As shown, a fifth insulating layer 85 may be further provided between the second connector 32 and the battery cell 2 to prevent the second connector 32 from short-circuiting with the electrode sheets of opposite polarity in the battery cell 2. Specifically, when the second connector 32 has a sixth connecting sheet 56, the fifth insulating layer 85 is located between the sixth connecting sheet 56 of the second intermediate member and the battery cell 2.

[0137] In some embodiments, as Figure 8 and Figure 12 As shown, 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 is wrapped around the side of the battery cell 2 and can also fix the battery cell 2 to improve the stability of the battery cell 2.

[0138] 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 the second electrode tab 22 is arranged on the second current collector; along the direction from the second socket 32 to the battery cell 2, the distance between the second socket 32 and the second current collector is less than 1 mm, that is, the distance between the second socket 32 and the second current collector along the direction from the second socket 32 to the battery cell 2 is less than 1 mm.

[0139] like Figure 11 and Figure 12 As shown, the battery cell 2 has a side surface located between the first surface of the battery cell 2 and the second surface of the battery cell 2 , and a protective adhesive layer 9 is provided on at least a portion of at least one side surface of the battery cell 2 .

[0140] 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, and 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 (also the thickness direction of the electrode sheet).

[0141] like Figure 11 and Figure 12 As shown, the side surfaces of the battery cell 2 include a first side surface, a second side surface, a third side surface, and a fourth side surface that are sequentially connected. The first side surface is the end surface of the battery cell 2 facing the first side plate 11 (i.e., the side of the battery cell 2 provided with the first pole tab 21 and the second pole 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), and the first side surface and the third side surface are located on opposite sides of the second side surface (or the fourth side surface). The first side surface and the third side surface may be parallel to each other, the second side surface and the fourth side surface may be parallel to each other, the first side surface (or the third side surface) and the second side surface (or the fourth side surface) may be perpendicular to each other, the direction from the first side surface to the third side surface may be the length direction of the battery cell 2, and the direction from the second side surface to the fourth side surface may be the width direction of the battery cell 2, or the direction from the first side surface to the third side surface may be the width direction of the battery cell 2, and the direction from the second side surface to the fourth side surface may be the length direction of the battery cell 2.

[0142] 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 (such as all) of them are provided with a protective adhesive layer 9, but it is not limited thereto, and a protective adhesive layer 9 can also be provided on the first side.

[0143] In addition, the number of protective adhesive layers 9 on any side of the battery 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 the side along the length direction of the side may not be greater than the length of the side, for example, basically equal; when the number of protective adhesive layers 9 on any side is multiple, the multiple protective adhesive layers 9 are spaced apart on the side of the battery cell 2, so that there is a gap between any two adjacent protective adhesive layers 9, which facilitates the infiltration of the electrolyte into the electrode in the battery cell through the gap, further optimizing the battery performance.

[0144] Taking the second side as an example, when the number of protective adhesive layers 9 on the second side is one, 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, basically equal to the length of the second side; when the number of protective adhesive layers 9 on the second side is multiple, the multiple protective adhesive layers 9 may be distributed at intervals on the second side.

[0145] In some embodiments, as Figure 11 and Figure 12 As shown, the protective adhesive layer 9 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 and / or 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 electrode sheet exposed on the side of the battery cell 2 can be prevented from contacting the shell 1, and the battery cell 2 can be fixed at the same time, thereby improving the safety and stability of the battery.

[0146] In addition, if Figure 12 As shown, the protective adhesive layer 9 can be provided with one or more fifth through holes 90, preferably multiple fifth through holes 90. The multiple fifth through holes 90 can be evenly or unevenly distributed in the portion of the protective adhesive layer 9 opposite the side of the battery cell (the portion of the protective adhesive layer 9 overlaps the side of the battery cell 2 (such as the second side)). As a result, the fifth through holes 90 can improve the wettability of the electrolyte to the battery cell 2, allowing the electrolyte to better penetrate the electrode sheet, further optimizing battery performance. In particular, when the number of protective adhesive layers 9 on any side of the battery cell 2 is one, the protective adhesive layer 9 on that side can be provided with one or more fifth through holes 90.

[0147] The protective adhesive layer 9 may specifically be adhesive tape, which generally has insulating and adhesive properties. It may be conventional adhesive tape in the art and is not particularly limited thereto.

[0148] The first receiving member 31, the first pole ear 21, the second pole ear 22, and the second receiving member 32 are located on the end surface of the battery cell 2 facing the first side plate 11, and the first surface of the battery cell 2 and the second surface of the battery cell 2 are respectively located on opposite sides of the end surface of the battery cell 2 facing the first side plate 11. The direction from the first surface of the battery cell 2 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 of the battery cell 2 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 surface of the battery cell 2 facing the first side plate 11.

[0149] 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 respectively the outermost electrode sheets of the battery cell 2, that is, the remaining electrode sheets are stacked between 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. The polarity of 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 can be the same or different, and can be a positive electrode sheet or a negative electrode sheet, and can be the first electrode sheet or the second electrode sheet. It is usually preferred that 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 negative electrode sheets.

[0150] Specifically, if Figures 8 to 12As shown, the battery cell 2 includes a plurality of stacked electrode sheets, the electrode sheets including a first electrode sheet and a second electrode sheet, which are separated by a diaphragm. The polarity of the first electrode sheet is opposite to that of the second electrode sheet. 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 on the side where the tabs (the first tab and the second tab) are provided (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 the tabs (the first tab 21 and the second tab 22) are provided on the current collectors (the first current collector and the second current collector), specifically, they can be provided at the ends of the current collectors. The end face of the battery cell 2 on the side facing the first side plate 11 is formed by the end faces of the side where the tabs are provided on the plurality of stacked electrode sheets (the end faces of the electrode sheets parallel to their thickness direction).

[0151] The battery cell 2 may include a laminated cell 2 and / or a wound cell 2. The wound cell 2 is formed by stacking and winding a plurality of electrode sheets, specifically a first electrode sheet, a separator, and a second electrode sheet, stacked and wound in sequence. The laminated cell 2 is specifically formed by stacking a first electrode sheet, a separator, and a second electrode sheet in sequence. The battery may include, but is not limited to, a lithium-ion battery.

[0152] Specifically, if Figures 1 to 3 As shown, the housing 1 may include a first side panel 11, a second side panel 12, a third side panel 13, a fourth side panel 14, a fifth side panel 15, and a sixth side panel 16. The first side panel 11, the second side panel 12, the third side panel 13, and the fourth side panel 14 are connected in sequence and are respectively located between the sixth side panel 16 (or bottom panel) and the fifth side panel 15 (or cover panel), thereby forming a closed cavity in which the battery cell 2 is placed. The first side panel 11 and the third side panel 13 are located on opposite sides of the second side panel 12 (or fourth side panel 14), the second side panel 12 and the fourth side panel 14 are located on opposite sides of the first side panel 11 (or third side panel 13), and the fifth side panel 15 and the sixth side panel 16 are respectively located on opposite sides of the first side panel 11 (or second side panel 12, or third side panel 13, or fourth side panel 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 is the width direction of the housing 1, while the direction from the second side plate 12 to the fourth side plate 14 is the length direction of the housing 1. One of the first side of the battery cell 2 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.

[0153] The first side panel 11 and the second side panel 12, the second side panel 12 and the third side panel 13, and the third side panel 13 and the fourth side panel 14 can be connected by a circular arc transition portion 17, that is, the connection portion of two adjacent side panels is formed by a circular arc transition. Specifically, the side of the circular arc transition portion 17 facing away from the cavity and the side facing the cavity in a cross section perpendicular to a first direction are both arcs, forming a groove with an opening toward the cavity. The first direction is parallel to the direction from the fifth side panel 15 to the sixth side panel 16 (i.e., the thickness direction of the housing 1).

[0154] The housing 1 may also be provided with a thinned portion 151. The mechanical strength of the thinned portion 151 is less than that of the rest of the housing 1 excluding the thinned portion 151. Thus, when excessive internal pressure in the battery occurs, pressure relief occurs preferentially through the thinned portion 151, thereby preventing battery explosions and other such situations. Specifically, the thinned portion 151 may be provided on the fifth side plate 15 (the surface of the fifth side plate 15 may be parallel to the surface of the electrode sheet). Specifically, the thickness of the thinned portion 151 is less than that of the rest of the housing 1 excluding the thinned portion 151.

[0155] In addition, the shell 1 is also provided with an injection hole 100 and a sealing sheet for sealing the injection hole 100. The injection hole 100 is used to inject electrolyte into the cavity. After the electrolyte is injected, the injection hole 100 is sealed with a sealing sheet. The sealing sheet may include a metal sheet, which can be welded to the shell 1 around the injection hole 100 to seal the injection hole 100.

[0156] Specifically, the injection hole 100 can be arranged on the first side plate 11, specifically between the connecting part of the first side plate 11 and the second middle part and the connecting part of the first side plate 11 and the first supporting part 31 (or the external connecting piece 41). The sealing plate can be welded to the side of the first side plate 11 away from the cavity, specifically to the part of the first side plate 11 located around the injection hole 100, so as to seal the injection hole 100.

[0157] The welding as described above may specifically be laser welding. For example, the first connecting piece 51 of the first intermediate piece may be connected to the first receiving piece 31 by laser welding, and the injection hole 100 may be sealed by laser welding using a sealing piece.

[0158] The first electrode tab 21 can be a positive electrode tab or a negative electrode tab, that is, one of the first electrode tab 21 and the second electrode tab 22 is a positive electrode tab, and the other is a negative electrode tab. Preferably, the first electrode tab 21 is a positive electrode tab.

[0159] The shell 1 can specifically be a metal packaging shell, that is, it can be made of metal, that is, 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.

[0160] Generally, when the shell 1 is electrically connected to the positive electrode ear, the shell 1 can be made of a material with the same polarity as the positive electrode ear, such as aluminum or aluminum alloy, and the specific material types of the two can be the same or different (when the materials of the two are different, for example, the material of the positive electrode ear is aluminum, and the material of the shell 1 is aluminum alloy); when the shell 1 is electrically connected to the negative electrode ear, the shell 1 and the negative electrode ear are made of the same polarity material, such as nickel, iron or nickel-iron alloy, and the specific material types of the two can be the same or different.

[0161] In addition, the material of the first receiving member 31, the material of the first intermediate member, and the material of the first tab 21 can be materials of the same polarity. For example, if the first tab 21 is a positive tab, the material of the first receiving member 31, the material of the first intermediate member, and the material of the first tab 21 can each be aluminum or an aluminum alloy, and the specific material types can be the same or different. The material of the second receiving member 32, the material of the second intermediate member, and the material of the second tab 22 can each be materials of the same polarity. For example, if the second tab 22 is a negative tab, the material of the second receiving member 32, the material of the second intermediate member, and the material of the second tab 22 can each be nickel, iron, or a nickel-iron alloy, and the specific material types can be the same or different.

[0162] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A battery, characterized in that: include: The shell is configured to form a cavity; the shell includes a first side plate; A battery cell is located in the cavity, and the battery cell is provided with a first tab; an external contact piece electrically connected to the first tab, the external contact piece being located on a side of the first side plate facing away from the cavity, the external contact piece including a pole formed by an outward protrusion, the first side plate including a second through-hole corresponding to the pole, the pole being connected to the first tab via the second through-hole; the diameter of the pole increasing or decreasing along a direction from the first side plate to the battery cell; The battery further includes a first receiving member located between the first side plate and the battery cell; The battery further includes a first middle piece located between the battery cell and the first side plate, the first middle piece being connected to the first tab and the first receiving piece respectively; The first intermediate member includes a first connecting piece connected to the first receiving member and a fourth connecting piece connected to a side of the first tab facing away from the battery cell; The first connecting piece includes a first connecting portion connected to the first receiving member, and a second connecting portion extending along the extending direction of the first side plate, and the second connecting portion is connected to the fourth connecting piece.

2. The battery according to claim 1, characterized in that The first receiving member is electrically connected to the first tab. The first receiving member is provided with a first through hole corresponding to the pole. The pole is connected to the first receiving member through the first through hole.

3. The battery according to claim 2, characterized in that The first through hole of the first receiving member includes a first hole segment and a second hole segment connected to each other, and the second hole segment is located on a side of the first hole segment close to the battery core; One end of the pole close to the battery core extends outward to form an extension portion corresponding to the second hole segment.

4. The battery according to claim 2 or 3, characterized in that An end surface of the pole close to the battery core is flush with a side surface of the first receiving member close to the battery core.

5. The battery according to claim 2, characterized in that One end of the pole close to the battery core extends out of the first through hole and extends outward along the circumference of the first through hole to form an extension portion connected to a side surface of the first receiving member close to the battery core.

6. The battery according to claim 2, characterized in that A first insulating sheet is further provided between the external connecting piece and the first side plate, a second insulating sheet is further provided between the first receiving member and the first side plate, and the pole penetrates the first insulating sheet and the second insulating sheet; and / or, A first insulating layer is provided between the pole and the first side plate; and / or, A second insulating layer is provided between the first receiving member and the battery core.

7. The battery according to claim 6, characterized in that The housing further includes a sixth side plate connected to the first side plate; The second insulating sheet includes a first insulating portion and a second insulating portion. The first insulating portion is located between the first receiving member and the first side plate, and the pole penetrates the first insulating portion. The second insulating portion is located between the first receiving member and the sixth side plate.

8. The battery according to claim 7, characterized in that The projection of the second insulating portion on the sixth side plate covers the projection of the first receiving member on the sixth side plate; and / or, The projection of the first insulating portion on the first side plate covers the projection of the first receiving member on the first side plate; and / or, The included angle between the first insulating portion and the second insulating portion is in the range of 80° to 120°.

9. The battery according to any one of claims 6 to 8, characterized in that: The projection of the first insulating sheet on the first side plate covers the projection of the external sheet on the first side plate.

10. The battery according to claim 6, characterized in that The battery cell includes a plurality of stacked electrode sheets, and the battery cell has a first side surface and a second side surface arranged opposite to each other, wherein the second insulating layer extends to the first side surface of the battery cell and is bonded to the electrode sheet located on the first side surface of the battery cell, and / or the second insulating layer extends to the second side surface of the battery cell and is bonded to the electrode sheet located on the second side surface of the battery cell.

11. The battery according to claim 2, characterized in that The projection of the first receiving member on the first side plate does not overlap with the projection of the first electrode tab on the first side plate.

12. The battery according to claim 11, characterized in that The housing includes a second side plate connected to the first side plate, and a projection of the first receiving member on the second side plate at least partially overlaps with a projection of the first tab on the second side plate.

13. The battery according to claim 2, characterized in that The end surface of the battery cell on which the first electrode tab is provided is parallel to the thickness direction of the battery cell; and / or, The distance between the side of the first tab away from the battery cell and the side of the first tab connected to the battery cell is not greater than the length of the first receiving member 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 tab, the length of the first receiving member is 1 mm-3 mm.

14. The battery according to claim 1, characterized in that The first middle piece further includes a first connecting assembly connected to the first connecting piece and the fourth connecting piece respectively; The first connecting assembly includes a second connecting piece and a third connecting piece; The second connecting piece is located between the first receiving member and the battery core; In the direction from the first receiving member to the first electrode tab, the third connecting piece is located between the first electrode tab and the first receiving member; The first connecting piece, the second connecting piece, the third connecting piece, and the fourth connecting piece are connected in sequence.

15. The battery according to claim 1, characterized in that A sixth insulating layer is further provided on the side of the first connecting piece facing away from the first receiving member; and / or, A first angle is formed between a surface of the first receiving member connected to the first connecting piece and a surface of the fourth connecting piece connected to the first tab, and the first angle is in a range of 80-120°; and / or, The first connecting piece is welded to the first receiving member; and / or, The battery core includes a plurality of stacked electrode sheets, and a surface of the first connecting sheet connected to the first receiving member is parallel to a surface of the electrode sheet.

16. The battery according to claim 1, characterized in that The battery further includes a third insulating layer located between the first middle member and the first side plate.

17. The battery according to claim 16, characterized in that The third insulating layer includes a first portion located on a side of the fourth connecting piece facing away from the first electrode tab.

18. The battery according to claim 17, characterized in that The battery cell includes a plurality of stacked electrode sheets; The battery cell has a first side surface and a second side surface that are arranged opposite to each other; The third insulating layer further includes a second portion extending from an end of the first portion close to the first side of the battery cell toward the battery cell, and a third portion extending from an end of the first portion close to the second side of the battery cell toward the battery cell.

19. The battery according to claim 18, characterized in that The projection of the first electrode tab 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 tab 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 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.

20. The battery according to claim 18 or 19, characterized in that The second portion of the third insulating layer extends to the first side surface of the battery cell and is bonded to the electrode sheet located on the first side surface of the battery cell; and / or, The third portion of the third insulating layer extends to the second side surface of the battery cell and is bonded to the electrode sheet located on the second side surface of the battery cell.

21. The battery according to claim 2, characterized in that The battery cell includes a plurality of stacked electrode sheets, each of which includes a first current collector, and the first electrode tab is disposed on the first current collector; Along the direction from the first connecting member to the battery core, the distance between the first connecting member and the first current collector is less than 1 mm.

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

23. The battery according to claim 22, characterized in that The housing includes a second side plate connected to the first side plate, and a projection of the first electrode tab on the second side plate at least partially overlaps with a projection of the second electrode tab on the second side plate; and / or, The projection of the second receiving member on the second side plate at least partially overlaps with the projection of the second electrode tab on the second side plate.

24. The battery according to claim 22 or 23, characterized in that The battery further includes a first connector located between the first side plate and the battery cell, the first connector being electrically connected to the first tab, the first tab and the second tab being located between the first connector and the second tab; and / or, The second receiving member is welded to the first side plate; and / or, The distance between the side of the second tab away from the battery cell and the side of the second tab connected to the battery cell is not greater than the length of the second receiving member along the direction from the first side plate to the second tab; and / or, Along the direction from the first side plate to the second tab, the length of the second receiving member is 1 mm to 4 mm; and / or, Along the direction from the first side plate to the second electrode tab, the length of the second receiving member is equal to or greater than the length of the first receiving member.

25. The battery according to claim 1, characterized in that The battery cell has a first surface and a second surface that are opposite to each other, and a side surface between the first surface and the second surface. A protective adhesive layer is provided on at least a portion of at least one side surface of the battery cell.

26. The battery according to claim 25, characterized in that The battery cell includes a plurality of stacked electrode sheets, and the protective adhesive layer of the battery cell 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 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.

27. The battery according to claim 25 or 26, characterized in that The protective adhesive layer is provided with one or more fifth through holes.

28. The battery according to claim 1, characterized in that The first electrode tab is a positive electrode tab or a negative electrode tab; and / or, The battery core includes a laminated battery core or a wound battery core.

Images