WO2023185288A1

WO2023185288A1 - Battery

Info

Publication number: WO2023185288A1
Application number: PCT/CN2023/075941
Authority: WO
Inventors: 卫志达; 谢继春; 王智峰; 厉成北
Original assignee: 珠海冠宇电池股份有限公司
Priority date: 2022-03-26
Filing date: 2023-02-14
Publication date: 2023-10-05
Also published as: CN114665233A

Abstract

Provided in the present invention is a battery. The battery comprises: a housing enclosing a cavity, the housing comprising a first side plate; a battery cell located in the cavity, the battery cell being provided with a first tab; a first intermediate connecting member located between the first side plate and the battery cell, the first intermediate connecting member comprising a fourth connecting piece connected to a side of the first tab away from the battery cell; and a third insulating layer located in the cavity, the third insulating layer being located between the first side plate and the first intermediate connecting member. The present invention can improve the performance, such as the stability and safety, of a battery.

Description

Battery

Technical field

The invention relates to the field of electrochemical energy storage devices, and in particular to a battery.

Background technique

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 environmental protection, and have been widely used in industries such as digital electronic products and electric vehicles.

With the development of science and technology, the requirements for the stability and safety of batteries are becoming higher and higher. Therefore, it is urgent to improve the stability and safety of batteries.

Contents of the invention

The invention provides a battery that can improve the stability, safety and other properties of the battery.

The invention provides a battery, which includes: a casing, which is surrounded by a cavity; the casing includes a first side plate; a battery core located in the cavity, and the battery core is provided with a first tab; A middle connecting piece located between the first side plate and the battery core. The first middle connecting piece includes a fourth connecting piece connected to the side of the first tab away from the battery core; A third insulating layer is located in the cavity, and the third insulating layer is located between the first side plate and the first middle connecting piece.

According to an 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 tab.

According to an embodiment of the present invention, the battery core includes a plurality of stacked electrode sheets; the battery core has a first surface and a second surface arranged oppositely; the third insulating layer further includes a layer from the first part. a second portion extending from one end of the first surface close to the battery core in a direction close to the battery core; and from an end of the first portion close to the second surface of the battery core in a direction close to the battery core. The extension forms the third part.

According to an embodiment of the present invention, the projection of the first tab in the thickness direction of the battery core is located within the projection of the second part of the third insulating layer in the thickness direction of the battery core, and /or, the projection of the first tab in the thickness direction of the battery core is located within the projection of the third part of the third insulating layer in the thickness direction of the battery core; and/or, the The projection of the first tab in the length direction of the battery core is located within the projection of the first part of the third insulating layer in the length direction of the battery core.

According to an embodiment of the present invention, the second part and the third part are located on opposite sides of the first part.

According to an embodiment of the present invention, the second part of the third insulating layer extends to the first side of the battery core and is bonded to the electrode sheet located on the first side of the battery core; and/or, the The third part of the third insulating layer extends to the second surface of the battery core and is bonded to the electrode sheet located on the second surface of the battery core.

According to an embodiment of the present invention, the battery further includes a first conductive member located between the first side plate and the battery core, the first middle connecting member further includes a first connecting piece, and the The first connecting piece includes a first connecting portion connected with the first guide member and a second connecting portion extending along the extending direction of the first side plate. The second connecting portion is connected to the fourth connecting piece. The connecting pieces are connected.

According to an embodiment of the present invention, the second connecting portion is located between the first tab and the second part, or between the first tab and the third part.

According to an embodiment of the present invention, the battery further includes a first conductive member located between the first side plate and the battery core, and the first middle connecting member further includes a first conductive member connected to the first conductive member. A first connecting piece connected to the first connecting piece and a connecting assembly respectively connected to the first connecting piece and the fourth connecting piece; the connecting assembly includes a second connecting piece and a third connecting piece; the second connecting piece is located at Between the first conductive member and the battery core; in the direction from the first conductive member to the first tab, the third connecting piece is located between the first tab and the first tab. Between the first conductive members, the first connecting piece, the second connecting piece, the third connecting piece, and the fourth connecting piece are connected in sequence.

According to an embodiment of the present invention, a sixth insulation layer is provided on a side of the first connecting piece away from the first conductive member; and/or, the first conductive member is connected to the first connection member. A first included angle is formed between the side where the sheets are connected and the side where the fourth connecting piece is connected to the first tab, and the range of the first included angle is 80-140°; and/or, The first connecting piece is welded to the first conducting member; and/or the battery core includes a plurality of stacked electrode sheets, and the first connecting piece is connected to the first conducting member. One side is parallel to the surface of the electrode sheet.

According to an embodiment of the present invention, the housing includes a second side plate connected to the first side plate, and the projection of the first guide member on the second side plate is in line with the first side plate. The projections of the tabs on the second side plate at least partially overlap.

According to an embodiment of the present invention, the battery further includes an external connecting piece disposed on a side of the first side plate facing away from the cavity, the external connecting piece includes an outwardly protruding pole, and the The first conductive member includes a first through hole corresponding to the pole. The pole penetrates the first side plate and is connected to the first conductive member through the first through hole. .

According to an embodiment of the present invention, the first through hole of the first guide member includes a first hole section and a second hole section connected to each other, and the second hole section is located near the first hole section. On one side of 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 section.

According to an embodiment of the present invention, an end surface of the pole close to the battery core is flush with a side surface of the first conductive member close to the battery core.

According to an embodiment of the present invention, one end of the pole close to the battery core protrudes from the first through hole, and extends outward along the circumferential direction of the first through hole to form a connection with the first conductor. The connector is close to an extension portion where one side surface of the battery core is in contact with each other.

According to an embodiment of the present invention, a first insulating piece is further provided between the external piece and the first side plate, and a second insulating piece is further provided between the first conductive member and the first side plate. Insulating sheet, 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, the The first guide piece A second insulation layer is provided between the battery core and the battery core.

According to an 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; and/or, the second insulating sheet The projection on the first side plate covers the projection of the first conductive member on the first side plate; and/or the first insulating layer is the first insulating sheet close to the first side. One side of the board is formed by protruding outwards, or the side of the second insulating sheet close to the first side plate is formed by protruding outwards.

According to an embodiment of the present invention, the battery includes a plurality of stacked electrode sheets, and the battery core has a first side and a second side arranged oppositely, wherein the second insulating layer extends to the battery core. and/or the second insulating layer extends to the second side of the battery core and is bonded to the electrode sheet located on the first side of the battery core. The electrode sheets on both sides are bonded.

According to an embodiment of the present invention, the battery core is further provided with a second tab, and the second tab has an opposite polarity to the first tab; the battery further includes a second middle connector and a third Four insulating layers, the second middle connecting piece is located between the first side plate and the battery core, the fourth insulating layer is located in the cavity, the second middle connecting piece includes and the third An eighth connecting piece is connected to a side of the two tabs facing away from the battery core, and the fourth insulating layer includes a fourth portion located on a side of the eighth connecting piece facing away from the second tab.

According to an 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 tab, and the distance between the fourth portion and the first side plate is equal to The distance between the first part and the first side plate is equal; and/or the third insulating layer includes a first part located on a side of the fourth connecting piece facing away from the first tab, and the fourth The thickness of the part is equal to the thickness of the first part; and/or the housing includes a second side plate connected to the first side plate, and the first tab is on the second side plate. The projection at least partially overlaps with the projection of the second tab on the second side plate; and/or the battery further includes a second conductor located between the first side plate and the battery core. connector, the second conductor is connected to the second tab and the second middle connector respectively; the housing includes a second side plate connected to the first side plate, the The projection of the second conductive member on the second side plate at least partially overlaps the projection of the second tab on the second side plate; and/or, the battery further includes a A second conductive member between the side plate and the battery core, the second conductive member is connected to the second tab and the second middle connecting member respectively, and the second conductive member is connected to the second connecting member. The first side plate is welded; and/or the battery further includes a first conductor and a second conductor located between the first side plate and the battery core, the first conductor are respectively connected to the first pole tab and the first middle connecting piece, and the second conductive member is respectively connected to the second pole tab and the second middle connecting piece; along the first side plate In the direction to the second tab, the length of the second conductive member is equal to or greater than the length of the first conductive member.

According to an embodiment of the present invention, the first tab is a positive tab or a negative tab; and/or, the battery core includes a laminated battery core or a wound battery core.

In the present invention, the first middle connecting piece is electrically connected to the first tab, and a third insulating layer is provided between the first middle connecting piece and the first side plate (casing), which can prevent the first middle connecting piece from connecting with the casing. physical contact to avoid short circuit and other phenomena, thereby improving the stability and safety of the battery. At the same time, the first middle connector and the first tab are located on the same side of the battery core (the side facing the first side plate) , it can also save cavity space, increase battery cell size, and improve battery energy density and other performance.

Description of drawings

Figure 1 is a schematic diagram of the connection structure between the first conductor and the housing according to an embodiment of the present invention;

Figure 2 is a schematic diagram of the connection structure between the first conductor and the housing according to an embodiment of the present invention;

Figure 3 is a schematic diagram of the connection structure between the first conductor and the housing according to an embodiment of the present invention;

Figure 4 is a schematic structural diagram of an external connecting piece and a pole according to an embodiment of the present invention;

Figure 5 is a schematic diagram of the connection structure between the first conductor and the housing according to an embodiment of the present invention;

Figure 6 is a schematic diagram of the connection structure between the first conductor and the housing according to an embodiment of the present invention;

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

Figure 8 is a schematic diagram of the connection structure between the cell tabs and the conductive parts according to one embodiment of the present invention;

Figure 9 is a schematic diagram showing the connection structure between the first tab and the first conductor according to an embodiment of the present invention;

Figure 10 is a schematic diagram showing the connection structure of the first tab, the first conductor and the third insulating layer according to an embodiment of the present invention;

Figure 11 is a schematic structural diagram of a battery core package according to an embodiment of the present invention;

Figure 12 is a schematic structural diagram of a battery core package according to an embodiment of the present invention;

Figure 13 is a schematic structural diagram of a battery according to an embodiment of the present invention.

Explanation of reference signs: 1: casing; 11: first side plate; 12: second side plate; 13: third side plate; 14: fourth side plate; 15: fifth side plate; 16: sixth side Plate; 17: arc transition part; 100: liquid injection hole; 110: second through hole; 151: thinned part; 2: battery core; 21: first pole; 22: second pole; 31: third A conductive member; 310: first through hole; 32: second conductive member; 41: external connecting piece; 42: pole; 43: extension; 51: first connecting piece; 511: first connecting portion; 512 : The second connecting part; 52: The second connecting piece; 53: The third connecting piece; 54: The fourth connecting piece; 55: The fifth connecting piece; 551: The third connecting part; 552: The fourth connecting part; 56: The sixth connecting piece; 57: the seventh connecting piece; 58: the eighth connecting piece; 6: the first insulating piece; 60: the third through hole; 7: the second insulating piece; 70: the fourth through hole; 71: the third An insulating part; 72: second insulating part; 81: first insulating layer; 82: second insulating layer; 83: third insulating layer; 84: fourth insulating layer; 85: fifth insulating layer; 86: sixth Insulating layer; 9: protective adhesive layer; 90: fifth through hole.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be described in further detail below. The specific embodiments listed below only describe the principles and features of the present invention, and the examples are only used to explain the present invention and do not limit the scope of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "set", "installation", "connection", "connected", "connected", etc. should be understood in a broad sense. For example, they can be fixed connections, It can also be a detachable connection or an integrated 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 intermediary, or an internal connection between two components. For those of ordinary skill in the art, the above-mentioned specific meanings in the present invention can be understood in specific situations. In addition, terms such as "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", etc. are used for descriptive purposes only, e.g. The various components are distinguished to illustrate/explain the technical solution more clearly, and should not be understood as indicating or implying the number or sequence of the indicated technical features. In addition, the terms "parallel", "perpendicular", "equal", etc. are all approximate, and the numerical values and numerical ranges involved are approximate. Affected by specific operating processes such as measurement and manufacturing processes, there may be a certain range of errors. Those skilled in the art can consider this part of the error to be negligible.

A battery is a commonly used electrochemical energy storage device. It generally includes a casing, a battery core packaged in a cavity surrounded by the casing, etc. The battery core is provided with tabs (such as the first tab below). During the battery packaging process, it is generally necessary to set up an intermediate connecting piece that is electrically connected to the tabs to lead out the electricity from the tabs. However, in conventional battery structures, the intermediate connecting piece can easily come into contact with the case, affecting the safety of the battery. performance and stability.

In response to the above problems, an embodiment of the present invention provides a battery, as shown in Figures 1 to 13. The battery includes: a housing 1, which is surrounded by a cavity; the housing 1 includes a first side plate 11; a battery core 2, Located in the cavity, the battery core 2 is provided with a first tab 21; a first middle connecting piece is located between the battery core 2 and the first side plate 11. The first middle connecting piece includes the first tab 21 away from the battery core 2. The fourth connecting piece 54 connected to one side of the cavity; the third insulating layer 83 is located in the cavity; the third insulating layer 83 is located between the first middle connecting piece and the first side plate 11 . Therefore, the first middle connecting piece is electrically connected to the first tab through the fourth connecting piece 54, and the third insulating layer 83 is provided between the first middle connecting piece and the first side plate 11 to avoid contact between the two. Improve battery performance such as safety and stability.

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 . In some embodiments, the battery core 2 includes a plurality of stacked electrode sheets. The battery core 2 has a first surface and a second surface that are oppositely arranged. The third insulating layer 83 also includes a first portion close to the battery core 2 from the first portion. A second part is formed from one end of the second surface extending in a direction close to the battery core 2 and a third part is formed in a direction extending from an end of the first part close to the second surface of the battery core 2 in a direction close to the battery core 2 .

Specifically, the second part and the third part may be respectively located on opposite sides of the first part, that is, the second part is connected to the first side of the first part, the third part is connected to the second side of the first part, and the second part is connected to the second side of the first part. The first side and the second side are opposite each other.

In addition, the above-mentioned battery may also include a first conductive member 31, which is connected to the first middle connecting member and thereby electrically connected to the first tab 21; the first conductive member 31 is disposed on the first side plate. Between 11 and battery cell 2.

In some embodiments, the projection of the first guide member 31 on the first side plate 11 does not overlap with the projection of the first tab 21 on the first side plate 11 (that is, the first guide member 31 is parallel to the first side plate 11 ). The projection of the extension direction of the side plate 11 does not overlap with the projection of the first tab 21 parallel to the extension direction of the first side plate 11 ).

Therefore, the first tabs 21 and the first conductive members 31 are not distributed along the direction from the battery core 2 to the first side plate 11. Specifically, in the direction along the first side plate 11 to the battery core 2, the third The distance from one side plate 11 to the battery core 2 is a ₁ , from the side where the first tab 21 is connected to the battery core 2 to the side of the first tab 21 away from the battery core 2 (that is, facing the first side plate 11 The distance between the first conductor 31 and the first conductor 31 is b ₁ . The side of the member 31 facing the first side plate 11 (that is, the length of the first conductive member 31 in the direction from the first side plate 11 to the battery core 2) is c ₁ , a ₁ < b ₁ + c ₁ , as shown by Therefore, compared with the existing technology in which the tabs and conductors are arranged along the length direction of the housing, the technical solution of this embodiment can make full use of the space between the battery core and the first side plate, and can save money. Cavity space, thereby increasing the size of the battery cell and improving the energy density and other performance of the battery.

In this embodiment, the extension direction of the first side plate 11 is parallel to the surface of the first side plate 11 , and the direction from the first side plate 11 to the battery core 2 can be parallel to the length direction of the housing 1 . The extending direction may be the width direction of the housing 1 or the thickness direction of the housing 1 . For example, as shown in FIG. 13 , the extending direction of the first side plate 11 is the width direction of the housing 1 .

Generally, the length direction of the housing 1 is also the length direction of the battery core 2, the width direction of the housing 1 is also the width direction of the battery core 2, and the thickness direction of the housing 1 is also the thickness direction of the battery core 2. In addition, the battery core 2 may include a plurality of stacked electrode sheets, and the electrode sheets are stacked along the thickness direction of the battery core 2 , that is, the thickness direction of the battery core 2 is also the thickness direction of the electrode sheets.

As shown in FIGS. 11 to 13 , the housing 1 includes a second side plate 12 connected to the first side plate 11 . The projection of the first conductor 31 on the second side plate 12 is in line with the position of the first tab 21 . The projections on the second side plate 12 at least partially overlap (that is, the projection of the first guide member 31 perpendicular to the extension direction of the first side plate 11 and the projection of the first tab 21 perpendicular to the extension direction of the first side plate 11 are at least partially overlapped). partially overlap), that is, the first conductor 31 and the first tab 21 are distributed along the extending direction of the first side plate 11 , thereby facilitating the connection between the first conductor 31 and the first tab 21 and further saving space. volume space to improve battery energy density and other performance.

Specifically, the surface of the second side plate 12 may be perpendicular to the surface of the first side plate 11 , and the battery core 2 may include a plurality of stacked electrode sheets. The surface of the second side plate 12 may be perpendicular to the surface of the electrode sheets (with the (the thickness direction of the electrode sheet is parallel), and the surface of the first side plate 11 is perpendicular to the surface of the electrode sheet.

In some specific embodiments, as shown in FIGS. 11 to 13 , the projection of the first conductive member 31 perpendicular to the width direction of the battery core 2 is at least partially the same as the projection of the first tab 21 perpendicular to the width direction of the battery core 2 . Overlapping, that is, the first conductive member 31 and the first tab 21 are distributed along the width direction of the battery core 2 .

In some embodiments, the distance from the side of the first tab 21 away from the battery core 2 to the side where the first tab 21 is connected to the battery core 2 is no longer than the distance between the first conductor 31 and the first side plate 11 along the first side plate 11 . The length of the first tab 21 (that is, the length of the first conductor 31 in the direction from the first side plate 11 to the first tab 21 ), that is, increasing the length of the first conductor 31 on the second side The overlap area between the projection on the plate 12 and the projection of the first tab 21 on the second side plate 12 is thus achieved to protect the first tab 21 in the width direction of the battery core and prevent the first tab 21 from being inserted into the battery. It will fall off during a drop or collision. At the same time, it can further expand the area of the electrode sheet of the battery core, which will help further improve battery energy density and other performance.

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

Specifically, the first conductor 31 may be block-shaped (or called a first adapter block), and its thickness direction may be parallel to the direction from the first side plate 11 to the first tab 21 , that is, the first conductor 31 The length of 31 in the direction from the first side plate 11 to the first tab 21 is the thickness of the first conductive member 31 .

As shown in Figures 1, 2, 4 and 5, the above-mentioned battery also includes an external connection piece 41 provided on the side of the first side plate 11 of the housing 1 facing away from the cavity. The external connection piece 41 includes an outwardly protruding shape. The pole 42 penetrates the first side plate 11 and is connected to the second conductor. Wherein, the pole posts 42 are generally formed to protrude outward along the thickness direction of the external connection piece 41 , that is, the axial direction of the pole posts 42 is parallel to the thickness direction of the external connection piece 41 .

Specifically, the first side plate 11 is provided with a second through hole 110 corresponding to the pole 42 , and the pole 42 passes through the second through hole 110 to penetrate the first side plate 11 and be connected to the first conductor 31 .

In addition, the first conductive member 31 includes a first through hole 310 corresponding to the pole 42. The pole 42 penetrates the first side plate 11 and is connected to the first conductive member 31 through the first through hole 310. The second through hole 110 and the first through hole 310 may be coaxially disposed.

Generally, the cross section of the pole 42 perpendicular to the axial direction of the pole 42 is circular, as shown in Figure 6. The pole 2 can be cylindrical, or, as shown in Figures 4 and 5, the pole is The tapered structure means that the diameter of the pole 42 tends to increase or decrease in the direction away from the external piece 41 (or the direction from the external piece 41 to the first side plate 11 / first guide 31 ). The diameter of is the diameter of the cross section of the pole 42 perpendicular to the axial direction of the pole 42 .

Specifically, when the pole 42 has a tapered structure, the diameter of the pole 42 shows a changing trend (i.e., increases or decreases) along the direction from the first side plate 11 to the first conductor 31 , and this change It can be a gradual change, that is, a uniform increase or decrease with essentially the same amplitude. The aperture (diameter) of the second through hole 110 and the first through hole 310 changes correspondingly with the diameter of the pole post 42 . For example, along the direction from the first side plate 11 to the first conductive member 31 , the diameter of the pole post 42 gradually changes. increases, at this time, the diameters 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 conductor 31 , the diameter of the pole 42 gradually decreases, so At this time, the diameters of the second through hole 110 and the first through hole 310 also gradually decrease.

In some embodiments, as shown in FIGS. 5 and 6 , the first through hole 310 of the first guide member 31 includes a first hole segment and a second hole segment that are connected to each other, and the second hole segment is located in the first hole segment. On the side close to the battery core 2, an end of the pole post 42 close to the battery core 2 extends outward to form an extension 43 corresponding to the second hole section.

Specifically, the first hole section and the second hole section can be arranged coaxially, the first hole section and the second hole section are both circular through holes, and the diameter of the second hole section is larger than that of the first hole section and the second hole section. The diameter of one end of the connection, 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 first hole segment perpendicular to the first through hole 310. Axial projection of hole 310.

In addition, the cross-sectional area of the external piece 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 , and the projection of the external piece 41 perpendicular to the axial direction of the pole 42 covers the pole. 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, the extension 43 is perpendicular to the pole 42 The axial projection covers the axial projection of the pole 42 perpendicular to the pole 42 , and the cross-sectional area of the external piece 41 perpendicular to the axial direction of the pole 42 is larger than the cross-sectional area of the extension 43 perpendicular to the axial direction of the pole 42 , the projection of the external piece 41 perpendicular to the axial direction of the pole 42 covers the projection of the extension 43 perpendicular to the axial direction of the pole 42 , and the cross-sectional area of the extension 43 perpendicular to the axial direction of the pole 42 is substantially equal to the second hole section With a cross-sectional area perpendicular to the axial direction of the pole 42, the extension 43 is engaged in the second hole section and connected with the side wall of the second hole section.

As shown in FIGS. 5 and 6 , an end surface of the pole 42 close to the battery core 2 can be connected to an end surface of the first conductive member 31 close to the battery core 2 . The surface on one side is flush, which not only ensures the bonding strength between the pole post 42 and the first conductive member 31 , but also prevents the pole post 42 from causing damage to the first pole lug 21 or the connection between the first connecting piece 51 and the first conductive member 31 put one's oar in. 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 post 42 ) is substantially equal to the depth of the second hole segment along the axial direction of the first through hole 310 , whereby the extension portion 43 is snapped into the second hole section, and the end surface of the extension 43 close to the battery core 2 is flush with the surface of the first conductive member 31 facing the battery core 2 .

In addition, the end of the pole post 42 close to the battery core 2 can also extend out of the first through hole 310 and extend outward along the circumferential direction of the first through hole 310 to form a side with the first conductor 31 close to the battery core 2 The surface-connected extension 43 , that is, the end surface of the pole 42 close to the battery core 2 is not flush with the surface of the first conductive member 31 facing the battery core 2 , but is located between the first conductive member 31 and the battery core. between 2.

Among them, the epitaxial sheet, pole post 42, and epitaxial portion 43 can be integrally formed, and they can be made of metal. In specific implementation, the first guide member 31 and the first side plate 11 can be riveted through rivets. After riveting, the rivets An external piece 41 is formed on one end of the first side plate 11 away from the cavity, an extension 43 is formed on the other end, and a pole 42 is formed between the two ends. The formed pole 42 is, for example, a tapered structure.

In some embodiments, the first tab 21 is insulated from the housing 1 , specifically by providing an insulating sheet (insulating layer).

In some embodiments, as shown in FIGS. 1 to 3 , 5 , 6 , and 13 , a first insulating sheet 6 is disposed between the external sheet 41 and the first side plate 11 , and the first conductor 31 There is also a second insulating sheet 7 between the first side plate 11, that is, the external connecting sheet 41, the first insulating sheet 6, the first side plate 11, the second insulating sheet 7, and the first conductor 31 are stacked in sequence. 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. Therefore, the external connecting piece 41, the pole 42, and the first conductor The connector 31 is electrically connected to the first tab 21 and insulatedly connected to the first side plate 11 (casing 1).

Wherein, along the circumferential direction 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 circumferential direction of the first through hole 310 . The circumferential direction of the 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 protrudes outward from the side of the first insulating sheet 6 close to the first side plate 11 (into the second through hole 110 protrusions); or the first insulating layer 81 can be integrally formed with the second insulating sheet 7, and the first insulating layer 81 protrudes outward from the side of the second insulating sheet 7 close to the first side plate 11 (toward the second through hole). Protrusions in the hole 110) are formed.

Correspondingly, the first insulating sheet 6 is provided with a third through hole 60, and the pole post 42 passes through the third through hole 60 to penetrate the first insulating sheet 6; the second insulating sheet 7 is provided with a fourth through hole 70, The pole post 42 passes through the fourth through hole 70 to penetrate the second insulating sheet 7 . Specifically, the pole 42 passes through the third through hole 60 , the second through hole 110 , the fourth through hole 70 , and the first through hole 310 in order to achieve connection with the first conductive member 31 . The third through hole 60 , the second through hole 110 , the fourth through hole 70 and the first through hole 310 may be coaxially arranged.

As shown in Figures 1 to 3, Figure 5, Figure 6, and Figure 13, the projection of the first insulating sheet 6 on the first side panel 11 can cover the projection of the external sheet 41 on the first side panel 11 (i.e. The projection of the external piece 41 on the first side plate 11 is within the projection of the first insulating piece 6 on the first side plate 11), thereby preventing the external piece 41 from contacting the housing 1 and ensuring the insulation of the housing. edge. In addition, the projection of the second insulating sheet 7 on the first side plate 11 can cover the projection of the first conductor 31 on the first side plate 11 (that is, the projection of the first conductor 31 on the first side plate 11 Projected within the projection of the second insulating sheet 7 on the first side plate 11 ), thereby preventing the first conductive member 31 from contacting the housing 1 and ensuring the insulation of the housing. As a result, battery performance such as safety and stability can be further improved.

As shown in Figures 5 and 7, the housing 1 also includes a sixth side plate 16 connected to the first side plate 11. The second insulating sheet 7 can be an L-shaped structure, which includes a connected first insulating part 71 and a third insulating part 71. Two insulating parts 72, the first insulating part 71 is located between the first conductor 31 and the first side plate 11, and the pole 42 penetrates the first insulating part 71, that is, the first insulating part 71 is provided with the pole 42 In the corresponding fourth through hole 70 , the second insulating part 72 is located between the first conductive member 31 and the sixth side plate 16 . Therefore, the second insulating part 72 can provide support for the first conductive member 31 . It has the function of supporting and supporting, and can insulate the first conductor 31 from the sixth side plate 16 of the housing 1, thereby improving the safety and stability of the battery.

The projection of the first insulating part 71 on the first side plate 11 can cover the projection of the first conductive member 31 on the first side plate 11 (that is, the projection of the first conductive member 31 on the first side plate 11 (in the projection of the first insulating part 71 on the first side plate 11 ), the projection of the second insulating part 72 on the sixth side plate 16 can cover the first conductive member 31 on the sixth side plate 16 projection (that is, the projection of the first guide member 31 on the sixth side plate 16 is within the projection of the second insulating portion 72 on the sixth side plate 16 ) to prevent the first guide member 31 from contacting the first side plate 11 Or the sixth side plate 16 contacts.

Wherein, the surface of the sixth side plate 16 is parallel to the surface of the electrode sheet; the surface of the sixth side plate 16 and the first side plate 11 are not parallel, for example, perpendicular; the surface of the sixth side plate 16 and the second side plate 12 are not parallel. , such as vertical; the sixth side plate 16 may be, for example, a bottom side plate (or bottom plate).

In addition, an included angle is formed between the surface of the first insulating part 71 and the first conductive member 31 and the surface of the second insulating part 72 and the first conductive member 31 , and the range of the included angle may be 80° °～140°, such as 80°, 90°, 100°, 110°, 120°, 130°, 140°, etc., that is, the two are not parallel, such as perpendicular. The included angle formed between the plane where the first insulating part 71 is located and the plane where the second insulating part 72 is located may range from 80° to 140°, such as 80°, 90°, 100°, 110°, 120°, 130°, 140°. ° and so on, that is, the two are not parallel, such as perpendicular.

The first middle connecting piece is connected to the first pole lug 21 and the first conductive member 31 respectively (that is, the first conductive member 31 is connected to the first pole lug 21 through the first middle connecting piece). Specifically, it may be the first conductive piece. The component 31, the first connecting component, and the first tab 21 are welded in sequence.

Specifically, the first middle connecting piece is electrically connected to the second tab through the fourth connecting piece 54. The first middle connecting piece may include a first connecting piece 51 connected to the fourth connecting piece 54. The first connecting piece 51 is connected to the fourth connecting piece 54. The first connecting piece 31 is connected, that is, the first middle connecting piece is connected to the first guiding piece 31 through the first connecting piece 51 .

As shown in Figures 8 to 11, the first connecting piece has a bent structure, the first connecting piece 51 is connected to the first conductive member 31, and the fourth connecting piece 54 is connected to the first tab 21. Specifically, It is welding. A first included angle is formed between the side of the first conductor 31 that connects to the first connecting piece 51 and the side that connects the fourth connecting piece 54 to the first tab 21 . The range of the first included angle is is 80-140°, such as 80°, 90°, 100°, 120°, 130°, 140°, etc., that is, the side where the first guide member 31 is connected to the first connecting piece 51 and the fourth connecting piece 54 is connected to The connecting surfaces of the first tabs 21 are not parallel, for example, vertical. As a result, the connecting surface between the first conductive member 31 and the first connecting piece 51 and the connecting surface between the fourth connecting piece 54 and the first tab 21 are connected. The surfaces are staggered so that the two connecting surfaces are basically arranged along the width direction of the battery core, which not only reduces the space occupied by the first conductive member 31 and the first connecting piece 51 in the cavity, but also makes the first conductive member The connection between the member 31 and the first connecting piece 51 and the connection between the fourth connecting piece 54 and the first tab 21 do not interfere with each other. It can also be further improved that the first conductive member 31 is connected to the first tab 21 through the first middle connecting member. The stability of the connection, thereby improving the stability, safety and service life of the battery.

In addition, a third included angle is formed between the side of the first guide member 31 that is in contact with the first connecting piece 51 and the side of the first guide member 31 facing the first side plate 11 , and the range of the third included angle is 80° -140°, such as 80°, 90°, 100°, 120°, 130°, 140°, that is, the two are not parallel, for example, they can be perpendicular. The surface of the first conductive member 31 that is in contact with the first connecting piece 51 is, for example, the top surface of the first conductive member 31 .

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

In some embodiments, as shown in FIG. 8 , the first connecting 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 the third connecting piece 53. The second connecting piece 52 is located between the first conducting member 31 and the battery core 2; in the direction from the first conducting member 31 to the first tab 21, the third connecting piece 53 is located between the first conducting member 31 and the battery core 2. Between the first conductive member 31 and the first tab 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.

Specifically, the first middle connecting piece has a multiple bending structure, and its first connecting piece 51 is connected to the fourth connecting piece 54 through the second connecting piece 52 and the third connecting piece 53 in sequence, and the surface of the first connecting piece 51 is connected to the fourth connecting piece 54 . The surface of the second connecting piece 52 is not parallel, for example, perpendicular, and the angle range between the two is, for example, 80° to 120°; the surface of the second connecting piece 52 and the surface of the third connecting piece 53 are not parallel, and may or may not be perpendicular. The included angle range between the two is, for example, 80° to 120°; the included angle range between the fourth connecting piece 54 and the third connecting piece 53 is, for example, 80° to 120°. The surface of the fourth connecting piece 54 and the second connecting piece are The surfaces of 52 can be parallel. Therefore, by arranging multiple bends of the first connecting piece 51, the second connecting piece 52, the third connecting piece 53 and the fourth connecting piece 54, it is possible to prevent the first middle connecting piece from moving in the left and right directions and Rocking in the front and back direction can further improve the stability of the connection between the first conductive member 31 and the first tab 21 .

In other embodiments, as shown in FIGS. 9 to 12 , the first connecting piece 51 includes a first connecting portion 511 connected to the first guide member 31 , and an extension direction along the first side plate 11 (such as The second connecting portion 512 extends from the first conductive member 31 to the direction of the first tab 21 . The second connecting portion 512 is connected to the fourth connecting piece 54 .

The second connecting part 512 may be located between the first tab 21 and the second part, or the second connecting part 512 may be located between the first tab 21 and the third part.

In addition, the first connecting part 511 and the second connecting part 512 are located on the same side of the first conductive member 31 and on the same side of the first tab 21 . Specifically, the first connecting part 511 may be located away from the first conductive member 31 On one side of the sixth side plate 16 (the side facing the fifth side plate 15 ), the second connecting portion 512 can be specifically located on the side of the first tab 21 away from the sixth side plate 16 , and the second connecting portion 512 faces the third side plate 16 . The angle formed between one side of one pole 21 and the side where the fourth connecting piece 54 is connected to the first pole 21 may range from 80° to 140°, such as 80°, 90°, 100°, 120°, 130°, 140°, that is, they are not parallel, such as perpendicular.

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

In addition, the first connecting piece 51 and the first conducting member 31 may be welded, and a soldering mark is formed on the side of the first connecting piece 51 away from the first conducting member 31 . When the first connection piece 51 includes the above-mentioned first connection part 511 and the second connection part 512, the first connection part 511 and the first conductor 31 may be welded, and when the first connection part 511 is away from the first conductor 31, A welding mark is formed on one side of the connector 31 . Specifically, there is an overlapping area between the projection of the first conductive member 31 in the thickness direction of the battery core 2 and the projection of the first connecting piece 51 in the thickness direction of the battery core 2, and the welding area between the two is located in the overlapping area.

As shown in FIG. 13 , a sixth insulating layer 86 is also provided on the side of the first connecting piece 51 (or the first connecting portion 511 of the first connecting piece 51 ) away from the first conductive member 31 .

As shown in FIGS. 10 to 13 , the second part, the first part and the third part of the third insulating layer 83 are connected in sequence and surrounded by a first groove. The bottom wall of the first groove is the third insulating layer 83 The first part and the side walls are respectively the second part and the third part of the third insulating layer 83, the first tab 21, and the part where the first middle connecting member is connected to the first tab 21 (such as the fourth connecting piece 54. The second connecting portion 512) of the first connecting piece 51 located on the side of the first tab 21 is located in the first groove and is covered by the third insulating layer 83, thereby preventing the first tab 21 or the first connecting piece 51 from contacting the first groove. The case contacts and at the same time protects the first pole tab 21 and the first middle connecting piece, preventing the first pole tab 21 and the first middle connecting piece from colliding with the case during the battery drop process. Therefore, it is possible to Further improve battery performance such as stability and safety.

Specifically, the first tab 21 has an opposite first side and a second side. The first side of the first tab 21 and the second side of the first tab 21 are respectively located between the first tab 21 and the fourth connection. The opposite sides of the side where the sheets 54 are connected (that is, the side of the first tab 21 facing away from the battery core 2). When the first connecting piece 51 and the fourth connecting piece 54 of the first intermediate connecting piece are connected through the first connecting component (ie, the second connecting piece 52 and the third connecting piece 53) (as shown in Figure 8), the third insulation The layer 83 includes a first portion located on the side of the fourth connecting piece 54 facing 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 connecting piece includes a first connecting part 511 and a second connecting part 512 (as shown in FIGS. 9 to 12 ), the second connecting part 512 extends to the first tab 21 On the first side, the third insulating layer 83 includes a first portion located on the side of the fourth connecting piece 54 facing away from the first tab 21 , a second portion located on the side of the second connecting portion 512 facing away from the first tab 21 , and a second portion located on the side of the second connecting portion 512 facing away from the first tab 21 . The third part of the side (second side) of the pole lug 21 away from the second connecting part 512 .

In some embodiments, as shown in FIGS. 10 to 13 , the projection of the first tab 21 in the thickness direction of the battery core 2 (that is, the projection is perpendicular to the thickness direction of the battery core 2 ) is located on the third insulating layer 83 Within the projection of the second part in the thickness direction of the battery core 2 , the projection of the first tab 21 in the thickness direction of the battery core 2 is located within the projection of the third part of the third insulating layer 83 in the thickness direction of the battery core 2 , the projection of the first tab 21 in the length direction of the battery core 2 (that is, the projection is perpendicular to the length direction of the battery core 2 ) is located within the projection of the first part of the third insulating layer 83 in the length direction of the battery core 2 , that is, the third insulating layer 83 completely covers the first tab 21 and the portion where the first middle connector is connected to the first tab 21 . in, The direction from the second part to the first tab 21, the direction from the third part to the first tab 21, the direction from the second part to the third part, and the thickness direction of the battery core 2 can be parallel, and the direction from the first part to the first tab 21 can be parallel. The direction of 21 is parallel to the length direction of the battery core 2 .

In some preferred embodiments, as shown in FIG. 12 , the second part of the third insulating layer 83 extends to the first side of the battery core 2 and is in contact with the electrode sheet located on the first side of the battery core 2 (near the side of the housing 1 The electrode sheet) is bonded, and the third part of the third insulating layer 83 extends to the second surface of the battery core 2 and is bonded to the electrode sheet (the electrode sheet close to the housing 1) located on the second surface of the battery core 2, As a result, the third insulating layer 83 wraps around the side of the battery core 2 , which can further improve the stability of the battery core 2 .

As shown in Figures 8, 11 and 12, a second insulating layer 82 can also be provided between the first conductive member 31 and the battery core 2 to prevent the first conductive member 31 from having opposite polarity to the battery core 2. The electrode pad contact is short-circuited. Specifically, when the first conductive member 31 has the second connecting piece 52 , the second insulating layer 82 is located between the second connecting piece 52 of the first middle connecting piece and the battery core 2 .

In some embodiments, as shown in FIGS. 8 and 12 , the second insulating layer 82 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 . The second insulating layer 82 Extends to the second surface of the battery core 2 and is bonded to the electrode sheet located on the second surface of the battery core 2. In this way, the second insulating layer 82 wraps around the side of the battery core 2, and can also fix the battery core 2 and improve the battery core. 2 stability.

In some embodiments, the battery core 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 tab 21 is disposed on the first current collector; along In the direction from the first conductor 31 to the battery core 2, the distance between the first conductor 31 and the first current collector is less than 1 mm, that is, the distance between the first conductor 31 and the first current collector is from the first conductor 31 to the first current collector. The distance in the direction from the component 31 to the battery core 2 is less than 1 mm, thereby further shortening the space occupied by the first conductive component 31 and the first tab 21, improving the space utilization of the cavity, and expanding the occupied area of the electrode sheet. Enhance the energy density of the battery core.

The battery core 2 is also provided with a second tab 22, the polarity of the second tab 22 is opposite to that of the first tab 21; the battery also includes a second middle connector and a fourth insulating layer 84, the second middle connector is located on the electrical Between the core 2 and the first side plate 11, the second middle connecting member includes an eighth connecting piece 58 connected to the side of the second tab 22 away from the battery core 2, and the fourth insulating layer 84 is located on the second middle connecting piece. between the component and the first side plate 11.

As shown in FIGS. 10 to 13 , the fourth insulating layer 84 may include a fourth portion located on a side of the eighth connecting piece 58 away from the second tab 22 .

Specifically, the distance from the fourth part to the first side plate 11 may be equal to the distance from the first part to the first side plate 1; the thickness of the fourth part may be equal to the thickness of the first part.

In some embodiments, the fourth insulating layer 84 further includes a fifth portion extending from an end of the fourth portion close to the first surface of the battery core 2 in a direction close to the battery core 2 and a third portion formed from the fourth portion close to the battery core 2 . A sixth part is formed by extending one end of the second surface in a direction close to the battery core 2 .

Specifically, the fifth part and the sixth part may be respectively located on opposite sides of the fourth part, that is, the fifth part is connected to the first side of the fourth part, and the sixth part is connected to the second side of the fourth part, The first and second sides of the fourth section are opposite each other.

In addition, the battery may further include a second conductor 32 electrically connected to the second tab 22 and disposed between the first side plate 11 and the battery core 2 . The projection of the guide member 32 on the first side plate 11 is consistent with the The projection of the two pole tabs 22 on the first side plate 11 does not overlap (that is, the projection of the second conductor 32 parallel to the extension direction of the first side plate 11 and the projection of the second pole tab 22 parallel to the first side plate 11 The projections in the extension direction do not overlap).

Therefore, the second tabs 22 and the second conductive members 32 are not distributed along the direction from the battery core 2 to the first side plate 11. Specifically, in the direction along the first side plate 11 to the battery core 2, the third The distance from one side plate 11 to the battery core 2 is a ₁ , from the side where the second tab 22 is connected to the battery core 2 to the side of the second tab 22 away from the battery core 2 (that is, facing the first side plate 11 The distance between one side) is b ₂ , from the side of the second conductive member 32 facing the battery core 2 (that is, the side away from the first side plate 11 ) to the side of the second conductive member 32 facing the first side plate 11 (That is, the length of the second conductive member 32 in the direction from the first side plate 11 to the battery core 2) is c ₂ , a ₁ < b ₂ + c ₂ , thus, the cavity space can be further saved and the battery can be improved. energy density and other properties.

Among them, b ₂ and b ₁ may be equal or unequal, and c ₂ and c ₁ may be equal or unequal.

Specifically, the projections of the first pole tab 21 , the second pole tab 22 , the first conductor 31 , and the second conductor 32 on the first side plate do not overlap with each other.

As shown in FIGS. 11 to 13 , the projection of the second conductive member 32 on the second side plate 12 at least partially overlaps with the projection of the second tab 22 on the second side plate 12 (that is, the second conductive member 32 The projection perpendicular to the extension direction of the first side plate 11 and the projection of the second tab 22 perpendicular to the extension direction of the first side plate 11 at least partially overlap), that is to say, the second conductor 32 and the second tab 22 are arranged along the extension direction of the first side plate, specifically in the width direction of the battery core, thereby facilitating the connection between the second conductive member 32 and the second tab 22 , further saving the cavity space and improving the efficiency of the battery. Battery energy density and other properties.

In addition, the projection of the first pole 21 on the second side plate 12 at least partially overlaps with the projection of the second pole 22 on the second side plate 12 (that is, the extension of the first pole 21 perpendicular to the first side plate 11 The projection of the second tab 22 perpendicular to the extension direction of the first side plate 11 at least partially overlaps). The projection of the first guide member 31 on the second side panel 12 and the projection of the second guide member 32 on the second side panel 12 at least partially overlap.

Specifically, as shown in FIGS. 11 to 13 , the projection of the first tab 21 perpendicular to the width direction of the battery core 2 at least partially overlaps with the projection of the second tab 22 perpendicular to the width direction of the battery core 2 . The projection of the connector 32 perpendicular to the width direction of the battery core 2 at least partially overlaps with the projection of the second tab 22 perpendicular to the width direction of the battery core 2 .

In addition, the first pole tab 21 and the second pole tab 22 can be located between the first conductive member 31 and the second conductive member 32, thereby fully utilizing the space between the first conductive member 31 and the second conductive member 32. space to further expand the size of the electrode sheet of the battery core 2 in the length direction to increase the energy density of the battery core. For example, in a direction parallel to the direction from the first conductive member 31 to the first pole lug 21 , the first pole lug 21 and the second pole lug 22 are located between the first conductive member 31 and the second conductive member 32 , that is, The first conductor 31 , the first pole 21 , the second pole 22 , and the second conductor 32 can be arranged in sequence. For example, the first conductor 31 , the first pole 21 , the second pole 22 The second conductive members 32 can be arranged sequentially in the width direction of the battery core 2, and the first conductive members 31, the first tabs 21, the second tabs 22, and the second conductive members 32 can be arranged substantially coaxially. .

But it is not limited to this. In other embodiments, the first conductive member 31 and the second conductive member 32 may be located between the first pole tab 21 and the second pole tab 22 .

In addition, the first conductor 31, the first tab 21, the second tab 22, and the second conductor 32 generally do not protrude from the end surface of the battery core 2 (the end surface of the battery core 2 facing the first side plate 11). edge, neither in the thickness direction nor the width direction of the battery core 2 Extending out the outer edge of the battery core 2, that is, the projection of the battery core 2 on the first side plate 11 covers the projection of the first conductor 31 on the first side plate 11, and the projection of the battery core 2 on the first side plate 11 The projection covers the projection of the first tab 21 on the first side plate 11 , the projection of the battery core 2 on the first side plate 11 covers the projection of the second tab 22 on the first side plate 11 , and the projection of the battery core 2 on the first side plate 11 The projection on the side panel 11 covers the projection of the second guide member 32 on the first side panel 11 .

In some embodiments, the distance from the side of the second tab 22 away from the battery core 2 to the side of the second tab 22 connected to the battery core 2 is no greater than the distance between the second conductor 32 and the distance along the first side plate 11 The length in the direction to the second tab 22 is conducive to further improving the energy density and other performance of the battery.

Specifically, the second conductive member 32 may be in the shape of a block (or called a second adapter block), and its thickness direction may be parallel to the direction from the first side plate 11 to the second tab 22 , that is, the second conductive member 32 may be block-shaped (or called a second adapter block). The length 32 in the direction from the first side plate 11 to the second tab 22 is the thickness of the second conductive member 32 .

Generally, the direction from the first side plate 11 to the first tab 21 , the direction from the first side plate 11 to the second tab 22 , and the direction from the first side plate 11 to the battery core 2 are parallel.

In some embodiments, the length c ₂ of the second conductive member 32 in the direction from the first side plate 11 to the second tab 22 is 1 mm to 4 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm. mm, 4mm, etc.

c ₂ can be greater than or equal to c ₁ , that is, c ₂ ≥ _{c 1} , preferably c ₂ > c ₁ . Specifically, in some embodiments, the first tab 21 is insulated from the housing 1 , the second insulating sheet 7 is provided between the first conductor 31 and the first side plate 11 , and the second conductor 31 is insulated from the housing 1 . 32 can be welded to the first side plate 11, when c ₂ > c ₁ , the difference between the two (c ₂ -c ₁ ) can be basically equal to the thickness of the second insulating sheet 7; in other embodiments, the first pole The lug 21 and the second lug 22 are both insulatedly connected to the housing 1. A second conductor 31 is disposed between the first conductor 31 and the first side plate 11, and between the second conductor 32 and the first side plate 11. Insulating sheet 7 (the connection structure between the second conductive member 32 and the housing 1 can be similar to the connection structure between the first conductive member 31 and the housing 1 through the pole 42, which will not be described again), at this time c ₂ =c ₁ . As a result, the cavity space can be further saved and the energy density and other performance of the battery can be improved.

The second tab 22 can be electrically connected to the case 1, that is, the case 1, the second conductive member 32, and the second tab 22 are electrically connected. The second conductive member 32 can be connected to the second tab 22 and the case respectively. 1 is welded, specifically it can be welded to the first side plate 11 of the housing 1 .

The second middle connecting member is connected to the second pole lug 22 and the second conductive member 32 respectively (that is, the second conductive member 32 is connected to the second pole lug 22 through the second middle connecting member). Specifically, it may be the second conductive member. The piece 32, the second connecting piece, and the second tab 22 are welded in sequence.

Specifically, the second middle connecting piece is electrically connected to the second tab through the eighth connecting piece 58. The second middle connecting piece may include a fifth connecting piece 55 connected to the eighth connecting piece 58. The fifth connecting piece 55 is connected to the eighth connecting piece 58. The second conductive member 32 is connected, that is, the second middle connecting member is connected to the second conductive member through the fifth connecting piece 55 . As shown in Figures 8 to 12, the second middle connecting piece has a bent structure, the fifth connecting piece 55 is connected to the second conductive member 32, and the eighth connecting piece 58 is connected to the second tab 22. Specifically, It is welding, and a second included angle is formed between the side of the second conductor 32 that connects to the fifth connecting piece 55 and the side that connects the eighth connecting piece 58 to the second tab 22 . The range of the second included angle is is 80-140°, such as 80°, 90°, 100°, 120°, 130°, 140°, etc., that is, the two are not parallel, such as perpendicular. Therefore, the passage of the second guide member 32 through the third The stability of the connection between the second connecting piece and the second lug 22 further improves the stability, safety, service life and other qualities of the battery.

Among them, the side of the first connecting piece 51 that connects with the first conductive member 31 and the side that connects the fifth connecting piece 55 with the second conductive member 32 can be parallel, and the fourth connecting piece 54 connects with the first tab 21 The connecting side and the connecting side of the eighth connecting piece 58 and the second tab 22 may be parallel.

In addition, a fourth included angle is formed between the side of the second guide member 32 that is in contact with the fifth connecting piece 55 and the side of the second guide member 32 facing the first side plate 11 , and the range of the fourth included angle is 80° -140°, such as 80°, 90°, 100°, 120°, 130°, 140°, etc., that is, the two are not parallel, for example, they can be perpendicular.

In addition, the battery core 2 includes a plurality of stacked electrode sheets, and the side of the fifth connecting piece 55 that is in contact with the second conductive member 32 is parallel to the surface of the electrode sheets.

In some embodiments, as shown in FIG. 8 , the second connecting 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 the seventh connecting piece 57. The sixth connecting piece 56 is located between the second conductive member 32 and the battery core 2; in the direction from the second conductive member 32 to the second tab 22, the seventh connecting piece 57 is located between the second conductive member 32 and the battery core 2. Between the second conductive member 32 and the second tab 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.

Specifically, the second middle connecting 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, and the surface of the fifth connecting piece 55 is connected to the eighth connecting piece 58 . The surface of the sixth connecting piece 56 is not parallel, for example, perpendicular, and the angle range between the two is, for example, 80° to 120°; the surface of the sixth connecting piece 56 and the surface of the seventh connecting piece 57 are not parallel, and may or may not be perpendicular. The included angle range between the two is, for example, 80° to 120°; the included angle range between the eighth connecting piece 58 and the seventh connecting piece is, for example, 80° to 120°. The surface of the eighth connecting piece 58 and the sixth connecting piece 56 The surfaces can be parallel, thereby further improving the stability of the connection between the second conductive member 32 and the second tab 22 .

In other embodiments, as shown in FIGS. 9 to 12 , the fifth connecting piece 55 includes a third connecting portion 551 connected with the second guide member 32 , and a third connecting portion 551 along the extension direction of the first side plate 11 (such as The fourth connecting portion 552 extends from the second conductive member 32 to the second tab 22 and is connected to the eighth connecting piece 58 .

The fourth connection part 552 may be located between the second pole lug 22 and the fifth part, or the fourth connection part 552 may be located between the second pole lug 22 and the sixth part.

In addition, the third connection part 551 and the fourth connection part 552 are located on the same side of the second conductive member 32 and on the same side of the second tab 22 . Specifically, the third connection part 551 may be located away from the second conductive member 32 On one side of the sixth side plate 16 , the fourth connecting portion 552 can be specifically located on the side of the second tab 22 facing away from the sixth side plate 16 , and the fourth connecting portion 552 faces the side of the second tab 22 and the eighth connecting piece. The side of 58 that is connected to the second pole lug 22 is not parallel, for example, vertical.

Specifically, the third connecting part 551 and the fourth connecting part 552 can be integrally formed to form the fifth connecting piece 55. The surfaces of the third connecting part 551 and the fourth connecting part 552 can be flush, that is, the fifth connecting piece 55 can be A straight structure without a large degree of bending, but is not limited to this. The surface of the fifth connecting piece 55 and the surface of the eighth connecting piece 58 are not parallel, for example, perpendicular, that is, the surface of the fifth connecting piece 55 and the second conductive member 32 is connected to the surface of the eighth connecting piece 58 and the second tab 22 The connecting sides are not parallel, such as perpendicular.

In addition, the fifth connecting piece 55 and the second conducting member 32 may be welded, and a soldering mark is formed on the side of the fifth connecting piece 55 away from the second conducting member 32 . Wherein, when the fifth connecting piece 55 includes the third connecting part 551 and the fourth connecting part 552, the third connecting part 551 and the second conductive member 32 may be welded, and the third connecting part 551 is away from the second conductive member 32. One side of the piece 32 is formed with a weld mark. Specifically, there is an overlapping area between the projection of the second conductive member 32 in the thickness direction of the battery core 2 and the projection of the fifth connecting piece 55 in the thickness direction of the battery core 2, and the welding area of the two is located in the overlapping area.

In addition, a sixth insulating layer 86 is provided on the side of the fifth connecting piece 55 (or the third connecting portion 551 of the fifth connecting piece 55) away from the second conductive member 32. As shown in FIG. 13, the sixth insulating layer 86 may extend from the first connecting piece 51 to the fifth connecting piece 55. Specifically, it may extend from an end of the first connecting piece 51 facing away from the fifth connecting piece 55 to an 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 .

As shown in FIGS. 10 to 13 , the fifth part, the fourth part and the sixth part of the fourth insulating layer 84 are connected in sequence and surrounded by a second groove. The bottom wall of the second groove is the fourth insulating layer. The fourth part and side walls of 84 are respectively the fifth part and the sixth part of the fourth insulating layer 84, the second tab 22, and the part where the second middle connector is connected to the second tab 22 (such as the eighth The connecting piece 58, the fifth connecting piece 55 and the fourth connecting portion 552) located on the side of the second tab 22 are located in the second groove and covered by the fourth insulating layer 84, thereby further improving the stability and safety of the battery. sexual performance.

Specifically, the second tab 22 has an opposite first side and a second side. The first side of the second tab 22 and the second side of the second tab 22 are respectively located between the second tab 22 and the eighth connection. Opposite sides of the side where the pieces 58 meet. When the fifth connecting piece 55 and the eighth connecting piece 58 of the second middle connecting member are connected through the second connecting component (ie, the sixth connecting piece 56 and the seventh connecting piece 57) (as shown in Figure 8), the fourth insulation The layer 84 includes a fourth portion located on a side of the eighth connecting piece 58 facing away from the second tab 22 , a fifth portion located on the first side of the second tab 22 , and a sixth portion located on the second side of the second tab 22 . part; when the fifth connecting piece 55 of the second middle connecting piece includes a third connecting part 551 and a fourth connecting part 552 (as shown in FIGS. 9 to 12 ), the fourth connecting part 552 extends to the second tab 22 On the first side, the fourth insulating layer 84 includes a fourth portion located on a side of the eighth connecting piece 58 facing away from the second tab 22 , a fifth portion located on a side of the fourth connecting portion 552 facing away from the second tab 22 , and a fifth portion located on a side of the fourth connecting portion 552 facing away from the second tab 22 . The sixth portion of the side (second side) of the second tab 22 facing away from the fourth connecting portion 552 .

In some embodiments, as shown in FIGS. 10 to 13 , the projection of the second tab 22 in the thickness direction of the battery core 2 is located at the projection of the fifth part of the fourth insulating layer 84 in the thickness direction of the battery core 2 , the projection of the second tab 22 in the thickness direction of the battery core 2 is located within the projection of the sixth part of the fourth insulating layer 84 in the thickness direction of the battery core 2 , and the second tab 22 is within the length of the battery core 2 The projection in the direction is located within the projection of the fourth part of the fourth insulating layer 84 in the length direction of the battery core 2 , that is, the fourth insulating layer 84 completely covers the second tab 22 as well as the second middle connector and the second tab. 22 connected parts. Among them, the direction from the fifth part to the second tab 22, the direction from the sixth part to the second tab 22, the direction from the fifth part to the sixth part, and the thickness direction of the battery core 2 can be parallel, and the direction from the fourth part to the second tab 22 can be parallel. The direction of the diode tabs 22 is parallel to the length direction of the battery core 2 .

In some preferred embodiments, as shown in FIG. 12 , the fifth part of the fourth insulating layer 84 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 . The sixth portion of layer 84 extends to the third portion of cell 2 The fourth insulating layer 84 is bonded to the electrode sheet located on the second side of the battery core 2 on both sides. Therefore, the fourth insulating layer 84 wraps around the side of the battery core 2, which can further improve the stability of the battery core 2.

As shown in FIGS. 8 , 11 and 12 , a fifth insulating layer 85 may be disposed between the second conductive member 32 and the battery core 2 to prevent the second conductive member 32 from having opposite polarity to the battery core 2 . The electrode pad contact is short-circuited. Specifically, when the second conductive member 32 has the sixth connecting piece 56 , the fifth insulating layer 85 is located between the sixth connecting piece 56 of the second middle connecting member and the battery core 2 .

In some embodiments, as shown in FIGS. 8 and 12 , the fifth insulating layer 85 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 . The fifth insulating layer 85 Extends to the second surface of the battery core 2 and is bonded to the electrode sheet located on the second surface of the battery core 2. In this way, the fifth insulating layer 85 wraps around the side of the battery core 2, and can also fix the battery core 2 and improve the battery core. 2 stability.

In some embodiments, the battery core 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 tab 22 is disposed on the second current collector; along In the direction from the second conductor 32 to the battery core 2, the distance between the second conductor 32 and the second current collector is less than 1 mm. That is, the second conductor 32 and the second current collector are along the second conductor. The distance in the direction from the component 32 to the battery core 2 is less than 1 mm.

Generally, the direction from the second conductive member 32 to the battery core 2, the direction from the first conductive member 31 to the battery core 2, and the direction from the first side plate 11 to the battery core 2 are parallel.

As shown in Figures 11 and 12, the battery core 2 has a side surface located between the first surface of the battery core 2 and the second surface of the battery core 2, and at least a partial area of at least one side of the battery core 2 is provided with protection. Glue layer 9.

Specifically, the side of the battery core 2 is the side that exposes the outer edge of the electrode sheet in the battery core 2, and is formed by the end surfaces of a plurality of stacked electrode sheets perpendicular to the thickness direction thereof, that is, the side of the battery core 2 is parallel to the battery core. 2 thickness direction (also the thickness direction of the electrode sheet).

As shown in Figures 11 and 12, the side surfaces of the battery core 2 include a first side, a second side, a third side, and a fourth side that are connected in sequence. The first side is the end surface of the battery core 2 facing the first side plate 11. (That is, the side of the battery core 2 provided with the first tab 21 and the second tab 22), the second side and the fourth side are located on opposite sides of the first side (or the third side), and the first side and the third side are The sides are located on opposite sides of the second side (or fourth side). Wherein, the first side and the third side can be parallel to each other, the second side and the fourth side can be parallel to each other, the first side (or third side) and the second side (or fourth side) can be perpendicular to each other, and the first side The direction to the third side may be the length direction of the battery core 2 , and the second side to the fourth side may be the width direction of the battery core 2 , or the direction from the first side to the third side may also be the width of the battery core 2 direction, and the second side to the fourth side are the length direction of the battery core 2 .

Wherein, at least one of the second side, the third side and the fourth side is provided with a protective glue layer 9, that is, one or more (such as all) of them is provided with a protective glue layer 9, but is not limited to this. A protective adhesive layer 9 can also be provided on the first side.

In addition, the number of the protective glue layers 9 on any side of the battery core 2 may be one or more. When the number of the protective glue layers 9 on any one side is one, the protective glue layers 9 on the side along the The length in the longitudinal direction may not be greater than the length of the side, for example, substantially equal; when the number of protective glue layers 9 on any one side is multiple, the plurality of protective glue layers 9 are arranged at intervals on the side of the battery core 2, as follows: There is a gap between any two adjacent protective adhesive layers 9, and the gap facilitates the electrolyte to infiltrate into the pole pieces in the battery core, further optimizing the battery performance.

Taking the second side as an example, when the number of the protective glue layer 9 on the second side is one, the length of the protective glue layer 9 in the length direction of the second side may not be greater than the length of the second side, for example, the length of the second side. The lengths of the side surfaces are substantially equal; when there are multiple protective adhesive layers 9 on the second side, the multiple protective adhesive layers 9 can be distributed at intervals on the second side.

In some embodiments, as shown in FIGS. 11 and 12 , the protective adhesive layer 9 extends to the first side of the battery core 2 and is bonded to the electrode sheet located on the first side of the battery core 2 and/or extends to the battery core. 2 and is bonded to the electrode sheet located on the second side of the battery core 2. This prevents the exposed electrode sheet from the side of the battery core 2 from contacting the casing 1. At the same time, the battery core 2 can be fixed and the battery performance is improved. performance such as security and stability.

In addition, as shown in FIG. 12 , the protective adhesive layer 9 may be provided with one or more fifth through holes 90 , preferably multiple fifth through holes 90 , and the plurality of fifth through holes 90 may be evenly or unevenly distributed. In the part of the protective glue layer 9 opposite to the side of the battery core (this part of the protective glue layer 9 is stacked on the side of the battery core 2 (such as the second side)), the electrolyte can be increased through the fifth through hole 90 The wettability of the battery core 2 enables the electrolyte to better infiltrate into the electrode sheet, further optimizing the battery performance. Especially when the number of protective adhesive layers 9 on any side of the battery core 2 is one, the protective adhesive layer 9 on this side may be provided with one or more fifth through holes 90 .

The above-mentioned protective adhesive layer 9 can specifically be adhesive paper, which generally has insulation and viscosity. It can be conventional adhesive paper in this field, and is not particularly limited.

The first conductor 31, the first tab 21, the second tab 22, and the second conductor 32 are located on the end surface of the battery core 2 facing the first side plate 11. The first surface of the battery core 2 and the surface of the battery core 2 The second surfaces are respectively located on opposite sides of the end surface of the battery core 2 facing the first side plate 11 . The direction from the first surface of the battery core 2 to the second surface of the battery core 2 is the thickness direction of the battery core 2 (also the electrode sheet). thickness direction), the first surface (surface) of the battery core 2, the second surface (surface) of the battery core 2 and the surface of the electrode sheet can be parallel (perpendicular to the thickness direction of the electrode sheet), and the first surface (surface) of the battery core 2 can be parallel to the surface of the electrode sheet. The end surface of one side plate 11 can be vertical.

The electrode sheets located on the first side of the battery core 2 and the electrode sheets located on the second side of the battery core 2 are respectively the outermost electrode sheets of the battery core 2 , that is, the remaining electrode sheets are stacked on the first side of the battery core 2 between the electrode sheet and the electrode sheet located on the second side of the battery core 2 . The polarity of the electrode sheet located on the first side of the battery core 2 and the polarity of the electrode sheet located on the second side of the battery core 2 may be the same or different. They may be positive electrode sheets or negative electrode sheets, and may be the first electrode sheet or the second electrode sheet. Generally, it is preferred that the electrode sheet located on the first side of the battery core 2 and the electrode sheet located on the second side of the battery core 2 are negative electrode sheets.

Specifically, as shown in Figures 8 to 12, the battery core 2 includes a plurality of stacked electrode sheets. The electrode sheets include a first electrode sheet and a second electrode sheet, which are separated by a separator. The first electrode The polarity of the 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. Correspondingly, the second electrode sheet can be a negative electrode sheet or a positive electrode sheet. The end surface of the side of the battery core 2 provided with the tabs (the first tab and the second tab) (that is, the end surface of the side of the battery core 2 facing the first side plate 11 ) is parallel to the thickness direction of the battery core 2 . Specifically, the electrode sheet in the battery core 2 includes a current collector, and the tabs (the first tab 21 and the second tab 22) are arranged on the current collector (the first current collector and the second current collector). Specifically, it can be set At the end of the current collector, the end surface of the battery core 2 facing the first side plate 11 is formed by the end surface of a plurality of stacked electrode sheets with tabs (the end surface of the electrode sheet parallel to its thickness direction). .

The battery core 2 may include a laminated battery core 2 and/or a wound battery core 2. The wound battery core 2 is formed by stacking a plurality of electrode sheets and then rolling them. Specifically, it is composed of a first electrode sheet, The separator and the second electrode sheet are stacked in sequence and then rolled; The laminated battery core 2 is specifically composed of a first electrode sheet, a separator, and a second electrode sheet that are stacked in sequence. The battery may specifically include a lithium-ion battery, but is not limited thereto.

Specifically, as shown in FIGS. 1 to 3 , the housing 1 may include a first side plate 11 , a second side plate 12 , a third side plate 13 , a fourth side plate 14 , a fifth side plate 15 , a sixth side plate. Board 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 located at the sixth side panel 16 (or bottom panel) and the fifth side panel 15 respectively. (or cover), a closed cavity is formed, and the battery core 2 is placed in the cavity. The first side panel 11 and the third side panel 13 are located on opposite sides of the second side panel 12 (or the fourth side panel 14 ). The second side panel 12 and the fourth side panel 14 are located on the first side panel 11 (or the fourth side panel 14 ). On the opposite sides of the three side panels 13), the fifth side panel 15 and the sixth side panel 16 are respectively located on the first side panel 11 (or the second side panel 12, or the third side panel 13, or the fourth side panel 14). opposite sides of. The direction of the fifth side plate 15 to the sixth side plate 16 is the thickness direction of the casing 1 , the direction of the first side plate 11 to the third side plate 13 can be the length direction of the casing 1 , and the direction of the second side plate 12 to The direction of the fourth side plate 14 is the width direction of the casing 1, or the direction of the first side plate 11 to the third side plate 13 is the width direction of the casing 1, and the direction of 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 core 2 and the second side of the battery core 2 is the side of the battery core 2 facing the fifth side plate 15 , and the other is the side of the battery core 2 facing the sixth side plate 16 . The 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 .

Among them, arc transition portions 17 can be passed between the first side plate 11 and the second side plate 12 , between the second side plate 12 and the third side plate 13 , and between the third side plate 13 and the fourth side plate 14 . Connection, that is, the connecting part of two adjacent side panels is transitioned through an arc. Specifically, the arc transition portion 17 has a cross-section perpendicular to the first direction. The side away from the cavity and the side facing the cavity are arcs respectively, forming a groove with an opening facing the cavity. The first direction is parallel to The direction from the fifth side plate 15 to the sixth side plate 16 (that is, the thickness direction of the housing 1).

The case 1 can also be provided with a thinned portion 151. The mechanical strength of the thinned portion 151 is smaller than the mechanical strength of other parts of the case 1 except the thinned portion 151. Therefore, when the internal pressure of the battery is too high, priority can be given to The pressure is released through the thinned portion 151 to avoid battery explosion and other phenomena. 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 smaller than the thickness of other portions of the housing 1 except the thinned portion 151 .

In addition, the housing 1 is also provided with a liquid injection hole 100 and a sealing sheet for sealing the liquid injection hole 100. The liquid injection hole 100 is used for injecting electrolyte into the cavity. After the electrolyte is injected, the sealing sheet is used to seal the injection hole. The liquid hole 100 is sealed. The sealing sheet may include a metal sheet, which may be welded to the housing 1 around the liquid injection hole 100 to seal the liquid injection hole 100 .

Specifically, the liquid injection hole 100 can be provided on the first side plate 11 , specifically, it can be located at the joint between the first side plate 11 and the second middle connecting member and at the joint between the first side plate 11 and the first guide member 31 . Between the connecting parts (or the external connecting piece 41), the sealing piece can be welded to the side of the first side plate 11 away from the cavity. Specifically, it can be welded to the part of the first side plate 11 around the liquid injection hole 100 to prevent liquid injection. Hole 100 is sealed.

The welding mentioned above may specifically be laser welding. For example, the first connecting piece 51 of the first middle connecting member may be connected to the first guide member 31 through laser welding, and the sealing piece may be used to connect the liquid injection hole 100 through laser welding. Sealing etc.

The first pole 21 may be a positive pole or a negative pole, that is, one of the first pole 21 and the second pole 22 is the positive pole. The other one is the negative tab, preferably the first tab 21 is the positive tab.

The housing 1 may specifically be a metal packaging shell, that is, it may 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 , The six side plates 16 may be made of metal, such as aluminum, aluminum alloy, nickel, iron or nickel-iron alloy.

Generally, when the housing 1 is electrically connected to the positive terminal, the housing 1 can be made of the same polarity material as the positive terminal, such as aluminum or aluminum alloy respectively. The specific materials of the two can be the same or different (the two materials can be the same or different). When the materials are different, for example, the material of the positive electrode ear is aluminum, and the material of the housing 1 is aluminum alloy); when the housing 1 and the negative electrode ear are electrically connected, the housing 1 and the negative electrode ear are made of the same polarity, such as nickel respectively. , iron or nickel-iron alloy, the specific material types of the two can be the same or different.

In addition, the material of the first conducting member 31 , the material of the first connecting member, and the material of the first tab 21 may be materials of the same polarity. For example, the first tab 21 is a positive tab, and the first conducting member 31 The material of , the material of the first connecting piece, and the material of the first tab 21 can respectively be aluminum or aluminum alloy, and their specific material types can be the same or different. The material of the second conductive member 32 , the material of the second connecting member, and the material of the second tab 22 may be materials of the same polarity. For example, the second tab 22 is a negative tab, and the material of the second conductor 32 The material of the second middle connecting piece and the second pole lug 22 can be nickel, iron or nickel-iron alloy respectively, and their specific material types can be the same or different.

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

Claims

A battery, characterized in that it includes:

The shell is surrounded by a cavity; the shell includes a first side plate;

A battery core is located in the cavity, and the battery core is provided with a first tab;

A first middle connecting piece is located between the first side plate and the battery core. The first middle connecting piece includes a fourth connection connected to the side of the first tab away from the battery core. piece;

A third insulating layer is located in the cavity, and the third insulating layer is located between the first side plate and the first middle connecting piece.
The battery according to claim 1, wherein the third insulating layer includes a first portion located on a side of the fourth connecting piece facing away from the first tab.
The battery according to claim 2, characterized in that:

The battery core includes a plurality of stacked electrode sheets;

The battery core has a first side and a second side arranged oppositely;

The third insulating layer further includes a second part extending from an end of the first part close to the first surface of the battery core in a direction close to the battery core, and a second part extending from the first part close to the battery core. A third part is formed by extending from one end of the second surface toward the direction close to the battery core.
The battery according to claim 3, characterized in that:

The projection of the first tab in the thickness direction of the battery core is located within the projection of the second part of the third insulating layer in the thickness direction of the battery core, and/or,

The projection of the first tab in the thickness direction of the battery core is located within the projection of the third part of the third insulating layer in the thickness direction of the battery core; and/or,

The projection of the first tab in the length direction of the battery core is located within the projection of the first part of the third insulating layer in the length direction of the battery core.
The battery according to claim 3 or 4, wherein the second part and the third part are located on opposite sides of the first part.
The battery according to claim 3 or 4, characterized in that,

The second part of the third insulating layer extends to the first side of the battery core and is bonded to the electrode sheet located on the first side of the battery core; and/or,

The third part of the third insulating layer extends to the second surface of the battery core and is bonded to the electrode sheet located on the second surface of the battery core.
The battery according to claim 3, wherein the battery further includes a first conductive member located between the first side plate and the battery core, and the first middle connecting member further includes a first A connecting piece, the first connecting piece includes a first connecting part connected with the first guide member, and a second connecting part extending along the extension direction of the first side plate, the second connecting part Connected to the fourth connecting piece.
The battery according to claim 7, wherein the second connecting portion is located between the first tab and the second part, or between the first tab and the third part. between.
The battery according to claim 1, wherein the battery further includes a first conductive member located between the first side plate and the battery core, and the first middle connecting member further includes a connecting member with the first connecting member. The first connecting piece connected to the first guide member, and the connecting components respectively connected to the first connecting piece and the fourth connecting piece;

The connection component includes a second connecting piece and a third connecting piece;

The second connecting piece is located between the first conductive member and the battery core;

In the direction from the first conductor to the first tab, the third connecting piece is located between the first tab and the first conductor;

The first connecting piece, the second connecting piece, the third connecting piece, and the fourth connecting piece are connected in sequence.
The battery according to claim 7 or 9, characterized in that,

A sixth insulation layer is also provided on the side of the first connecting piece facing away from the first conductive member; and/or,

A first included angle is formed between a side of the first conductor connecting with the first connecting piece and a side connecting the fourth connecting piece with the first tab. The first clip The angle range is 80-140°; and/or,

The first connecting piece is welded to the first conductor; and/or,

The battery core includes a plurality of stacked electrode sheets, and a side of the first connecting sheet that is in contact with the first conductive member is parallel to the surface of the electrode sheet.
The battery according to claim 7 or 9, wherein the housing includes a second side plate connected to the first side plate, and the first conductor is on the second side plate. The projection at least partially overlaps with the projection of the first tab on the second side plate.
The battery according to claim 7 or 9, characterized in that the battery further includes an external connection piece disposed on a side of the first side plate facing away from the cavity, and the external connection piece includes an outward protrusion. The pole is formed, the first conductor includes a first through hole provided corresponding to the pole, the pole penetrates the first side plate, and connects to the pole through the first through hole. The first conductive parts are connected.
The battery according to claim 12, wherein the first through hole of the first conductor includes a first hole section and a second hole section connected to each other, and the second hole section is located on the first hole section. A hole section is close to the side of 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 section.
The battery according to claim 12, wherein an end surface of the pole close to the battery core is flush with a surface of the first conductive member close to the battery core.
The battery according to claim 12, wherein one end of the pole close to the battery core extends out of the first through hole and extends outward along the circumferential direction of the first through hole to form a The first conductive member is close to an extension portion in contact with one side surface of the battery core.
The battery according to claim 12, characterized in that:

A first insulating piece is also disposed between the external connecting piece and the first side plate, and a second insulating piece is disposed between the first conductive member and the first side plate. The pole passes through Through the first insulating sheet and the second insulating sheet; and/or,

A first insulation layer is provided between the pole and the first side plate; and/or,

A second insulation layer is provided between the first conductive member and the battery core.
The battery according to claim 16, characterized in that:

The projection of the first insulating sheet on the first side panel covers the projection of the external sheet on the first side panel; and/or,

The projection of the second insulating sheet on the first side plate covers the projection of the first conductive member on the first side plate; and/or,

The first insulating layer is formed by protruding outward from a side of the first insulating sheet close to the first side plate, or from a side protruding outward from the second insulating sheet close to the first side plate. form.
The battery according to claim 16, wherein the battery includes a plurality of stacked electrode sheets, the battery core has a first side and a second side arranged oppositely, wherein the second insulating layer extends to the first surface of the battery core and is bonded to the electrode sheet located on the first surface of the battery core, and/or the second insulating layer extends to the second surface of the battery core and is bonded to the electrode sheet located on the first surface of the battery core. The electrode sheet on the second side of the battery core is bonded.
The battery according to claim 1, characterized in that:

The battery core is also provided with a second tab, and the second tab has an opposite polarity to the first tab;

The battery also includes a second middle connector and a fourth insulating layer, the second middle connector is located between the first side plate and the battery core, and the fourth insulating layer is located in the cavity, The second middle connecting piece includes an eighth connecting piece connected to a side of the second tab facing away from the battery core, and the fourth insulating layer includes an eighth connecting piece located on the side of the eighth connecting piece facing away from the second The fourth part of one side of the pole ear.
The battery according to claim 19, 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 tab, and the distance between the fourth portion and the first side plate is the same as the distance between the first portion and the first tab. The sides of the panels are equally spaced; and/or,

The third insulating layer includes a first portion located on a side of the fourth connecting piece facing away from the first tab, and the thickness of the fourth portion is equal to the thickness of the first portion; and/or,

The housing includes a second side plate connected to the first side plate, and the projection of the first pole on the second side plate is the same as the projection of the second pole on the second side plate. projections on at least partially overlap; and/or,

The battery also includes a second conductive member located between the first side plate and the battery core, and the second conductive member is connected to the second tab and the second middle connector respectively. ; The housing includes a second side plate connected to the first side plate, and the projection of the second conductor on the second side plate is consistent with the projection of the second pole on the second side plate. The projections on the side panels at least partially overlap; and/or,

The battery also includes a second conductive member located between the first side plate and the battery core, and the second conductive member is connected to the second tab and the second middle connector respectively. , the second guide member is welded to the first side plate; and/or,

The battery further includes a first conductor and a second conductor located between the first side plate and the battery core, and the first conductor is connected to the first tab and the battery cell respectively. The first middle connecting piece is connected, and the second conductive piece is connected to the second pole tab and the second middle connecting piece respectively; along the direction from the first side plate to the second pole tab, the of the second guide piece The length is equal to or greater than the length of the first guide member.
The battery according to claim 1, characterized in that:

The first pole is a positive pole or a negative pole; and/or,

The battery core includes a laminated battery core or a wound battery core.