WO2023141819A1

WO2023141819A1 - Battery pack and electric equipment

Info

Publication number: WO2023141819A1
Application number: PCT/CN2022/074049
Authority: WO
Inventors: 李坤龙; 农文彬
Original assignee: 东莞新能安科技有限公司
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2023-08-03

Abstract

Embodiments of the present application relate to the technical field of battery devices. Particularly disclosed are a battery pack and electric equipment. The battery pack comprises a battery cell assembly, a connecting assembly, and a housing. The battery cell assembly is at least partially provided in the housing; the battery cell assembly comprises a plurality of battery cells; each battery cell comprises a battery cell housing, an electrode assembly, and an electrode; the electrode is connected to the electrode assembly and extends out of the battery cell housing; and the electrode comprises a first electrode and a second electrode which have opposite polarities. The connecting assembly is electrically connected to the battery cell assembly, and used components comprise a first insulating member, a second insulating member, and a conductive member; in a first direction, the conductive member is at least partially located between the first insulating member and the second insulating member; and the first insulating member is provided with a first opening. The housing comprises a first wall and a first through hole; the first through hole penetrates through the first wall; and in the first direction, the projection of the first opening, the projection of the conductive member, the projection of the first through hole and the projection of the second electrode overlap each other. In this way, the embodiments of the present application facilitate the sampling of battery cells, and save space.

Description

A battery pack and electrical equipment

technical field

The embodiments of the present application relate to the technical field of battery devices, and in particular, to a battery pack and electrical equipment.

Background technique

At present, the power lithium battery industry is developing very rapidly, and its application has been extended to electric buses, electric cars, micro-buses and energy storage and other electrical equipment fields. Among them, in order to ensure the normal and safe use of the battery pack, it is often necessary to set up connecting components to collect, sample and conduct the cell voltage of the battery pack. In the prior art, a large number of sampling lines are commonly used for sampling, which occupies more internal space of the battery pack.

Contents of the invention

In view of the above problems, the embodiments of the present application provide a battery pack, an electrical device, and the internal space of the battery pack.

According to an aspect of the embodiments of the present application, a battery pack is provided, and the battery pack includes a case, a cell assembly, and a connection assembly. Wherein, the cell assembly includes a plurality of cells, the cell includes a cell casing, an electrode assembly, and an electrode, the electrode is connected to the electrode assembly, and the electrode includes a first electrode with opposite polarity and The second electrode, the connection assembly is electrically connected to the cell assembly, the connection assembly includes a first insulating member, a second insulating member and a conductive member, and the conductive member is at least partially located on the second electrode along the first direction. Between an insulating member and the second insulating member, the first insulating member is provided with a first opening, the housing is provided with a first space, the cell assembly is at least partially located in the first space, and the housing The body includes a first wall and a first through hole, the first through hole runs through the first wall, viewed along the first direction, the second electrode is at least partly located in the first through hole, along the first through hole In one direction, the conductive member is located between the connecting portion and the first insulating member, and along the first direction, the projection of the first opening, the projection of the conductive member, and the projection of the first through hole The projection and the projection of the second electrode overlap. The electric cells at the corresponding positions can be sampled by using the conductive member, so as to reduce the occupation of the internal space of the battery pack.

In an optional manner, the first electrode includes a first connection portion, the second electrode includes a second connection portion, and the first connection portion and the second connection portion are respectively located on opposite sides of the battery cell. At both ends, the first connecting portion protrudes from the cell casing, or the first connecting portion and the second connecting portion are located at the same end of the cell, in a direction opposite to the first direction , the first connecting portion protrudes from the second connecting portion.

In an optional manner, along the first direction, the projection of the second connection part is arranged around the outside of the projection of the first connection part.

In an optional manner, the conductive element is connected to the second connecting portion.

In an optional manner, the battery pack includes a plurality of busbars, the busbars are arranged on the side of the first wall away from the battery cell assembly, and one of the busbars is connected to the corresponding The first electrode and/or the second electrode of the adjacent cell are connected. The bus bar is used to connect two adjacent battery cells.

In an optional manner, the manner of connecting at least one bus bar to the first electrode and the second electrode includes one of the following: a) the bus bar is connected to the first electrode of a cell, And be connected with the first electrode of another electric core adjacent, b) one said bus bar is connected with the second electrode of one electric core, and be connected with the second electrode of another electric core adjacent, c) one The bus bar is connected to the first electrode of one cell, and is connected to the second electrode of another adjacent cell, d) the bus bar is connected to the second electrode of one cell, and is connected to the adjacent connected to the first electrode of the other cell.

In an optional manner, the first wall is provided with a second through hole, and viewed along the first direction, the first connecting portion is at least partially located in the second through hole. The second through hole facilitates the electrical connection between the bus bar and the cell assembly.

In an optional manner, the second connection portion includes a first area, the first wall is provided with a third through hole, and one end of a bus bar is connected to two adjacent battery cells. The other end is connected to the first area of the other battery cell at the first connecting portion of one of the battery cells.

In an optional manner, viewed along the first direction, the projection of the first region overlaps with the projection of the third through hole.

In an optional manner, the second connecting portion includes a second area, and the first connecting portion is located between the first area and the second area.

In an optional manner, the first wall includes a first part and a second part, the first through hole is located in the first part, and the second through hole and the third through hole are located in the A second portion protruding from the first portion in a direction opposite to the first direction.

In an optional manner, the connecting component is arranged on the first part.

In an optional manner, the connection assembly is provided with a connection opening, the first part is provided with a first protrusion, and the first protrusion is located in the connection opening. The connection opening is connected with the first protrusion, thereby restricting the movement of the connection assembly relative to the housing.

In an optional manner, the conductive part includes a plurality of conductive metal parts, and the plurality of conductive metal parts are sequentially arranged at intervals along the second direction, and along the third direction, the lengths of the conductive metal parts decrease successively , wherein the third direction is perpendicular to the first direction and the second direction.

In an optional manner, the conductive member includes a plurality of conductive metal members, the plurality of conductive metal members are sequentially arranged at intervals along the second direction, and each of the conductive metal members includes a first segment that is separated from each other. and a second section, the first section is connected to the connecting portion, and the second section is not electrically connected to the cell assembly.

In an optional manner, the battery pack includes a circuit board, the circuit board is arranged in the first space, one end of the conductive member is connected to the connecting portion, and the other end of the conductive member connected to the circuit board. The circuit board can be used to stabilize the voltage of the battery pack and protect the normal operation of the battery pack.

In an optional manner, the circuit board includes a Battery Management System (BMS) board, and the BMS board can be used to control the charging and discharging of the battery cells.

In an optional manner, the housing includes a fourth through hole penetrating through the first wall, and the other end of the conductive member is connected to the circuit board through the fourth through hole. The fourth through hole facilitates the connection between the connecting component and the circuit board.

In an optional manner, along the first direction, the projection of the circuit board is separated from the projection of the electric core.

In an optional manner, the plurality of electric cells are arranged in sequence along a third direction, and along the third direction, projections of the circuit board and projections of the electric cores overlap.

In an optional manner, along the first direction, the first insulating member is closer to the first wall than the second insulating member.

In an optional manner, the first wall includes a partition provided between the adjacent third through hole and the second through hole, and along the third direction, the third through hole , the partition and the second through hole are arranged in sequence, and the third direction is perpendicular to the first direction.

In an optional manner, the battery pack further includes a third insulator, the third insulator is provided on the outer surface of the casing, and the third insulator covers the bus bar and the connection assembly .

In an optional manner, the connecting component is used to collect at least one of voltage, current or temperature of the battery core.

In an optional manner, the second insulating member is provided with a second opening, and along the first direction, the projection of the first opening, the projection of the second opening, and the projection of the conductive member , the projection of the first through hole and the projection of the first electrode/the second electrode overlap.

According to another aspect of the embodiments of the present application, an electric device is provided, the electric device includes the above-mentioned battery pack.

The embodiment of the present application is provided with a cell assembly, a connection assembly and a casing. Wherein, the cell assembly includes a plurality of cells, the cell includes a cell housing, an electrode assembly, and an electrode, the electrode is connected to the electrode assembly and extends out of the cell housing, and the electrode Including a first electrode and a second electrode with opposite polarities, the connection assembly is electrically connected to the cell assembly, the connection assembly includes a first insulating member, a second insulating member and a conductive member, along the first direction, the The conductive member is at least partially located between the first insulating member and the second insulating member, the first insulating member is provided with a first opening, the housing is provided with a first space, and the cell assembly is at least partially located The first space, the housing includes a first wall and a first through hole, the first through hole runs through the first wall, viewed along the first direction, the second electrode is at least partially located at the In addition, along the first direction, the conductive member is located between the second electrode and the first insulating member, and along the first direction, the projection of the first opening, the The projection of the conductive element, the projection of the first through hole and the projection of the second electrode overlap, and the conductive element can be used to sample the battery cells, reducing the occupation of the internal space of the battery pack.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings that need to be used in the description of the specific embodiments or the prior art. Throughout the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, elements or parts are not necessarily drawn in actual scale.

Fig. 1 is a schematic diagram of the assembly structure of the battery pack of the embodiment of the present application;

Fig. 2 is an exploded schematic diagram of a part of the structure of the battery pack of the embodiment of the present application;

Fig. 3 is an exploded schematic diagram of a part of the structure of the battery pack in the embodiment of the present application;

Fig. 4 is a schematic exploded view of the casing structure of the battery pack in the embodiment of the present application;

Fig. 5 is a partial structural assembly schematic diagram of the battery pack of the embodiment of the present application;

Fig. 6 is a partial cross-sectional view of the first casing of the battery pack according to the embodiment of the present application;

Fig. 7 is a perspective view of the first casing of the battery pack according to the embodiment of the present application;

Fig. 8 is a schematic diagram of a partial structural assembly of a battery pack according to an embodiment of the present application;

Fig. 9 is a schematic diagram of the partial structure assembly of the battery pack of the embodiment of the present application;

Fig. 10 is a partial cross-sectional view of the second casing of the battery pack according to the embodiment of the present application;

Fig. 11 is a schematic diagram of the partial structure assembly of the battery pack of the embodiment of the present application;

Fig. 12 is a perspective view of the internal structure of the cell of the battery pack of the embodiment of the present application;

Fig. 13 is a schematic assembly diagram of another part of the battery pack in the embodiment of the present application;

Fig. 14 is a schematic structural view of a single cell of the battery pack of the embodiment of the present application;

Fig. 15 is a schematic diagram of another part of the structural assembly of the battery pack in the embodiment of the present application;

Fig. 16 is an exploded schematic diagram of the connecting components of the battery pack in another embodiment of the battery pack of the present application;

Fig. 17 is an exploded schematic diagram of the connection assembly of another embodiment of the battery pack of the present application;

Fig. 18 is an exploded schematic diagram of another part of the structure of the battery pack in the embodiment of the present application;

Fig. 19 is a schematic diagram of the assembly of the circuit board and connecting components of the battery pack according to the embodiment of the present application;

Fig. 20 is a flow chart of the assembly process of the battery pack in the embodiment of the present application.

Detailed ways

In order to facilitate understanding of the application, the application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is said to be "fixed" to another element, it may be directly on the other element, or there may be one or more intervening elements therebetween. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions are used in this specification for the purpose of description only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field of this application. The terms used in the description of the present application are only for the purpose of describing specific embodiments, and are not used to limit the present application. The term "and/or" used in this specification includes any and all combinations of one or more of the associated listed items.

The technical features involved in the various embodiments of the present application described below may be combined as long as they do not constitute conflicts with each other.

In order to better explain the structure of the battery pack, the structure of the battery pack will be described in conjunction with the X, Y, and Z coordinate axes, where the X, Y, and Z coordinate axes are perpendicular to each other, and the first direction is the positive direction of the X axis. direction, the second direction is the positive direction of the Y axis, and the third direction is the positive direction of the Z axis.

Referring to FIG. 1 and FIG. 2 , the battery pack 01 includes a casing 10 , a cell assembly 20 and a connection assembly 30 . Wherein, the cell assembly 20 is at least partially disposed in the housing 10 , and the connection assembly 30 is connected to the cell assembly 20 . The connection assembly 30 is used for collecting, sampling and transmitting at least one of the voltage, current or temperature of the cells in the cell assembly 20 .

The battery pack also includes a plurality of bus bars 40 , a circuit board 50 , a first conductive sheet 60 , and a second conductive sheet 70 . The bus bar 40 is arranged on the outer wall of the housing 10, the bus bar 40 is electrically connected to the cell assembly 20, the circuit board 50 is arranged in the housing 10, and the circuit board 50 The first conductive sheet 60 and the second conductive sheet 70 can be used to electrically connect with the cell assembly 20 .

The battery pack further includes a third insulating member 80 , and the third insulating member 80 covers the outer surface of the housing 10 . The third insulator 80 can be used to seal the housing 10 and reduce the contact between the bus bar 40 and the connection assembly 30 and external components.

Specifically, for the above housing 10, as shown in Figure 3 and Figure 4, the housing 10 is provided with a first space (not marked), the housing 10 includes a first housing 11 and a second housing 12 , the first housing 11 and the second housing 12 are fixed, and the first housing 11 and the second housing 12 enclose to form the first space. The first space can be used for accommodating the above-mentioned battery cell assembly 20 .

For the above-mentioned first housing 11, as shown in Fig. 4 and Fig. 5, the first housing 11 includes a first wall 111, and the first wall 111 is provided with a first through hole 1111, and the first through hole 1111 runs through the first wall 111 , and the first through hole 1111 facilitates the connection between the battery cell assembly 20 and the connection assembly 30 . The first housing 11 further includes a third side wall 11b and a fourth side wall 11c opposite to each other, a fifth side wall 11d and a sixth side wall 11e opposite to each other, wherein the second direction Y is the direction of the third side wall 11b is a direction in which the fourth side wall 11c is arranged opposite to each other, and the third direction Z is a direction in which the fifth side wall 11d and the sixth side wall 11e are arranged opposite to each other. The third side wall 11b, the fifth side wall 11d, the fourth side wall 11c and the sixth side wall 11e are sequentially connected and enclosed with the first wall 111 to form a first housing space 11a.

In some embodiments, the first housing 11 is provided with a plurality of first recesses 113, the plurality of first recesses 113 communicate with the first housing space 11a, and the plurality of first recesses 113 are located at the first A wall 111 is close to one side of the cell assembly 20 . Each of the first recesses 113 is used to place the first end of a battery cell 21 of the battery cell assembly 20, so as to limit the position of one battery cell 21 and reduce the relative position between the battery cell 21 and the housing 10 in the first space. displacement.

In some embodiments, the shape of the first concave portion 113 is not limited to a circular shape, and can also be other shapes. The shape of the first concave portion 113 can be set according to the actual shape of the electric core 21, for example: the electric core 21 When it is a cuboid, the first recess 113 can be set as a rectangle. At the same time, the first recess 113 is not limited to be located in the first housing space 11a, the first recess 113 can be a hollow cavity of a cylinder or a cuboid, and one end of the cylinder or cuboid is fixed to the The groove bottom of the first shell space 11a, the cylinder or cuboid is arranged in the first space, the hollow cavity of the cylinder or cuboid can wrap or partially wrap a battery core 21, and can The positioning of the electric core 21 is realized.

In some embodiments, the cell 21 includes one of a cylindrical cell or a square cell.

In some embodiments, the first end of the battery cell 21 is provided with a positive pole and a negative pole at the same time, that is, the positive pole and the negative pole of the battery cell 21 are located on the same side.

As shown in FIGS. 5 and 6 , in some embodiments, the inner side of the fifth side wall 11d is provided with a first fixing groove 114 and a third opening 114a communicating with the first fixing groove 114, and the third opening 114a faces the first fixing groove 114a. The second casing 12 is provided, and the third opening 114 a is convenient for the circuit board 50 to be assembled and snapped into the first fixing groove 114 . The first fixing slot 114 is used to limit one end of the above-mentioned circuit board 50 in the first space. Optionally, the part of the above-mentioned circuit board 50 located in the first fixing groove 114 can be fixed with an adhesive, and the adhesive can be glue or the like.

In some embodiments, the inner side of the first wall 111 is provided with a first card slot 115, the first card slot 115 communicates with the first fixing slot 114, and the first card slot 115 is used for better One end of the above-mentioned circuit board 50 is fixed. It can be understood that: the first locking slot 115 is not limited to communicate with the first fixing slot 114 , as long as the first locking slot 115 can fix one end of the circuit board 50 .

As shown in FIGS. 7-9 , in some embodiments, the first housing 11 is provided with a second through hole 1112 , the second through hole 1112 runs through the first wall 111 , and the second through hole 1112 The hole 1112 facilitates the electrical connection between the bus bar 40 and the battery cell assembly 20 .

In some embodiments, the first housing 11 is provided with a third through hole 1113, the third through hole 1113 runs through the first wall 111, and the third through hole 1113 is convenient for the communication between the bus bar 40 and the The electrical connection between the above-mentioned cell assemblies 20.

In some embodiments, the first wall 111 includes a first portion 111a and a second portion 111b, the first through hole 1111 is located in the first portion 111a, the second through hole 1112 and the third through hole 1113 is located in the second portion 111b. Optionally, in a direction opposite to the first direction X, the second portion 111b protrudes from the first portion 111a.

In some embodiments, the first part 111a is provided with a first protrusion 1114, and the first protrusion 1114 is used to connect with the connection assembly 30, and restrict the connection assembly 30 relative to the first wall 111 move.

In some embodiments, the first housing 11 is provided with a fourth through hole 1115, the fourth through hole 1115 is located on the first wall 111, and the fourth through hole 1115 runs through the first wall 111 , the fourth through hole 1115 facilitates the connection between the connection assembly 30 and the circuit board 50 .

As for the above-mentioned second housing 12 , as shown in FIG. 3 and FIG. 10 , the second housing 12 is fixed to the first housing 11 . The second housing 12 includes a second wall 121 and a plurality of second side walls 122 connected to the second wall 121, the second wall 121 is opposite to the first wall 111 along the first direction X .

It can be understood that: the fixing method of the first casing 11 and the second casing 12 can be fixed by adhesive bonding, and the fixing method of the first casing 11 and the second casing 12 is not limited to using an adhesive layer. Knot fixed, also can be other fixed methods, such as: welding, screwing and so on.

In some embodiments, as shown in FIG. 10, the second housing 12 is provided with a second housing space 12a, the second housing space 12a is used to accommodate the plurality of electric cores 21, and the second housing The body space 12a together with the first housing space 11a forms the first space.

In some embodiments, the second housing 12 is provided with a plurality of second recesses 123, the second recesses 123 communicate with the second housing space 12a, and one second recess 123 is used to place a The second end of the battery cell 21 implements a position-limiting setting for a battery cell 21 to reduce the relative displacement between the battery cell 21 and the casing 10 in the first space.

In some embodiments, the inner wall of one of the second side walls 122 is provided with a second fixing groove 124 and a fourth opening 124 a communicating with the second fixing groove 124 . The fourth opening 124a allows the other end of the circuit board 50 to be inserted into the second fixing groove 124, and the second fixing groove 124 is used to limit the other end of the circuit board 50 in the first space.

In some embodiments, a second card slot 125 is provided inside the second wall 121, and the second card slot 125 communicates with the second fixing slot 124, and the second card slot 125 is used for better fixing The other end of the circuit board 50.

In some embodiments, as shown in FIG. 3 and FIG. 10 , the second housing 12 is provided with a wire outlet 126 , and the wire outlet 126 facilitates the wires on the circuit board 50 to extend out of the wire outlet 126 to connect with other components. Optionally, a wire outlet 126 is provided on the second wall, and the wire outlet 126 is adjacent to the second clamping groove 125 and the second fixing groove 124, which facilitates the extension of the wire harness from the wire outlet 126 out of the second housing 12 outside.

For the above cell assembly 20, as shown in Figure 11 and Figure 12, the cell assembly 20 is at least partially located in the first space, the cell assembly 20 includes a plurality of cells 21, and the cells 21 include The cell casing 211 , the electrode assembly 212 and the electrode 213 , the electrode 213 is connected to the electrode assembly 212 and extends out of the cell casing 211 . The electrodes 213 include a first electrode 213a and a second electrode 213b. The electrode assembly 212 includes a first pole piece 2121, a second pole piece 2122 and a separator 2123 arranged between the first pole piece 2121 and the second pole piece 2122, the first electrode 213a is connected to the The first pole piece 2121, the second electrode 213b is connected to the second electrode 213b. In some embodiments, the cell casing 211 can be used as one of the two electrodes, for example: the cell includes the cell casing 211 and a positive electrode disposed outside the cell casing 211, so The cell casing 211 includes conductive material, and the cell casing 211 can be used as a negative electrode of the cell 21 . In this embodiment, the battery case 211 serves as the negative electrode of the two electrodes. Optionally, the plurality of battery cells 21 are arranged in a row along the third direction Z. In some embodiments, the plurality of battery cells 21 are arranged along the third direction Z to form a first battery cell group 21a.

In some embodiments, please refer to FIG. 13 and FIG. 14 together. Viewed along the first direction X, the second electrode 213b is at least partially located in the first through hole 1111, so that the second electrode 213b and the connection between the connection assembly 30.

It should be noted that: the positive and negative poles of the first electrode 213a and the second electrode 213b are not limited, the first electrode 213a can be a positive pole or a negative pole, and the second electrode 213b can be a negative pole or a positive pole, as long as the first electrode 213a is satisfied. 213a and the second electrode 213b may be mutually opposite electrodes.

In some embodiments, the first electrode 213a includes a first connection portion 213aa, the second electrode 213b includes a second connection portion 213bb, and the first connection portion 213aa and the second connection portion 213bb are connected to each other in the cell. The position on the housing 211 is not specifically limited, and the first connecting portion 213aa is only required to be located on a side close to the connecting assembly 30 . For example: the first connecting portion 213aa and the second connecting portion 213bb can be located at opposite ends of the cell casing 211, or the first connecting portion 213aa and the second connecting portion 213bb can be located at the The same end of the housing 211. In this embodiment, the first connecting portion 213aa and the second connecting portion 213bb are located at the same end of the cell. Optionally, in a direction opposite to the first direction X, the first connecting portion 213aa protrudes from the second connecting portion 213bb.

In some embodiments, viewed along the first direction X, the first connecting portion 213aa is at least partially located in the second through hole 1112 , and the second connecting portion 213bb is located in the first through hole 1111 , so as to be electrically connected with the bus bar 40, and the adjacent cells 21 are connected in series.

In some embodiments, viewed along the first direction X, the first electrode 213a is at least partially located in the first through hole 1111 , and the second electrode 213b is at least partially located in the second through hole 11112 , adjacent battery cells 21 are electrically connected through the bus bar 40 .

In some embodiments, along the first direction X, the projection of the second connecting portion 213bb is arranged around the outside of the projection of the first connecting portion 213aa. Optionally, an insulating sheet 214 is disposed between the first connecting portion 213aa and the second connecting portion 213bb, and the insulating sheet 214 is ring-shaped.

In some embodiments, please refer to FIG. 15 , the second connecting portion 213bb includes a first region 213bb1 and a second region 213bb2, viewed along the first direction X, the first region 213bb1 is located at the second Inside the three through holes 1113. Along the third direction Z, the second region 213bb2 is located between the first region 213bb1 and the first connecting portion 213aa of the adjacent cell, viewed along the first direction X, the first wall 111 covers all The second region 213bb2 restricts the electrical connection between the second region 213bb2 and the first region 213bb1 of an adjacent cell, and restricts the electrical connection between the second region 213bb2 and the first connecting portion 213aa of the same cell 21 . When adjacent cells are electrically connected by using the bus bar 40, one end of the bus bar 40 is electrically connected to the first connection portion 213aa of one of the cells, and the other end of the bus bar is electrically connected to the first area of the other cell. 213bb1, so as to realize the electrical connection between two adjacent cells. Viewed along the first direction X, the first wall 111 includes a partition 1116 disposed between the adjacent third through holes 1113 and the second through holes 1112, along the third direction Z, the first The three through holes 113 , the partition 1116 , and the second through hole 1112 are provided in sequence. The partition 1116 can limit the electrical connection between the first connection part 213aa and the second connection part 213bb of the same cell, reducing the risk of short circuit.

For the connection assembly 30 described above, as shown in FIGS. 8 , 9 and 16 , the connection assembly 30 is electrically connected to the cell assembly 20 , and the connection assembly 30 includes a first insulating member 301 and a second insulating member 302 and a conductive member 303, along the first direction X, the conductive member 303 is at least partially located between the first insulating member 301 and the second insulating member 302, and the first insulating member 301 is smaller than the second insulating member 302 Close to the first wall 111 , optionally, the first insulating member 301 is closer to the first portion 111 a of the first wall 111 than the second insulating member 302 is. Optionally, along the first direction X, the conductive member 303 is located between the second electrode 213b and the first insulating member 301 . In some embodiments, the connecting component 30 is disposed on the first portion 111 a of the first wall 111 . In other embodiments, the positions of the first insulating member 301 and the second insulating member 302 can be exchanged, for example, the second insulating member 302 is closer to the first wall 111 than the first insulating member 301. In some embodiments, the first insulating member 301 is provided with a first opening 3011, and along the first direction X, the projection of the first opening 3011, the projection of the conductive member 303, the first through hole The projection of 1111 and the projection of the second electrode 213b overlap to facilitate the electrical connection between the second electrode 213b and the conductive member 303, and the user can know the sampling through the position of the first opening 3011 What is specific is which battery cell 21, thereby reducing erroneous judgments.

In some embodiments, the second insulating member 302 is provided with a second opening 3021, along the first direction X, the projection of the first opening 3011, the projection of the second opening 3021, the conductive member 303, the projection of the first through hole 1111 and the projection of the second electrode 213b overlap, which facilitates the electrical connection between the second electrode 213b and the conductive member 303, and at the same time, reduces the use of the connection assembly 30 for sampling. When misjudgment occurs, the user can know which cell is being sampled through the positions of the first opening 3011 and the second opening 3021 , thereby reducing misjudgment.

In some embodiments, the conductive member 303 is connected to at least one of the first connecting portion 213aa or the second connecting portion 213bb. Optionally, the conductive member 303 is connected to the first connecting portion 213aa, and can collect information of the battery cell 21, such as voltage and current. Optionally, information of two adjacent battery cells 21 may be collected, such as voltage and current. Optionally, the conductive member 303 is connected to the second connecting portion 213bb, and can collect information of the battery cell 21, such as voltage and current. Optionally, the conductive member 303 is connected to the second connecting portion 213bb, and can collect information of two adjacent battery cells 21, such as voltage and current. In this embodiment, the conductive member 303 is connected to the second connecting portion 213bb, and the conductive member 303 can be connected to other regions other than the first region 213bb1 and the second region 213bb2 to facilitate assembly and connection.

In some embodiments, the connection assembly 30 is provided with a connection opening 304, and the first protrusion 1114 is located in the connection opening 304, so that the connection assembly 30 is limited on the first wall 111, reducing the number of connections. Movement of the assembly 30. Optionally, the connection opening 304 is a through hole or a blind hole or a recess, wherein the through hole passes through the connection assembly 30 , and the opening direction of the blind hole or the recess is towards the first protrusion 1114 .

In some embodiments, the conductive element 303 includes a plurality of conductive metal elements 3031 , and the plurality of conductive metal elements 3031 are sequentially arranged at intervals along the second direction Y. Optionally, along the third direction Z, the length of the conductive metal member 3031 decreases successively.

In some embodiments, please refer to FIG. 17 , each conductive metal member 3031 includes a first section 3031a and a second section 3031b separated, and the first section 3031a is connected to the first section 3031b. The electrode 213a/the second electrode 213b, the second section 3031b is not electrically connected to the cell assembly 20 . Along the third direction Z, the lengths of the conductive metal parts 3031 are substantially the same, which is convenient for assembly and manufacture. In some embodiments, the connection assembly 30 includes a flexible flat cable (FFC, Flexible Flat Cable), wherein the conductive metal part 3031 may include a thinner copper wire, which is beneficial to reduce the space occupied by the conductive metal part 3031. space.

In some embodiments, the plurality of conductive metal parts 3031 are arranged along the second direction Y to form a first conductive metal part group 3031a, and the first conductive metal part group 3031a is connected to the first cell group 21a, please also Referring to FIG. 11 , along the second direction Y, the first conductive metal member 3031a is provided with a first connection point 3031aa electrically connected to the battery cell 21, and the first connection point 3031aa is located close to the first electrode 213a on the same side, which is conducive to assembly and manufacturing. Optionally, the first conductive metal member 3031a is provided with a first connection point 3031aa electrically connected to the battery cell 21 and both are located on the same side of the first electrode 213a and the electrical connection area of the bus bar 40 . Along the first direction X, the projection of part of the conductive metal part 3031 overlaps with the projection of the first electrode 213a, and the first electrode 213a and the first electrode 213a can be limited by the first insulating member 301 and the second insulating member 302. The conductive metal piece 3031 is electrically connected.

The connection assembly 30 in this embodiment is arranged on the first casing 11, it can be understood that the position of the connection assembly 30 is not limited to the first casing 11, and the connection assembly 30 The number can be selected according to the actual situation, for example: the number of the connection assembly 30 can be 2, wherein one connection assembly 30 is set on the first housing 11, and the other connection assembly 30 is set on the second On the housing 12 , at this time, the structure of the second housing 12 can be set according to the structure of the first housing 11 , which will not be repeated here.

As for the plurality of bus bars 40 mentioned above, as shown in FIG. 13 and FIG. electrode 213a and/or the second electrode 213b. Adjacent cells 21 can be connected in series or in parallel. When adjacent cells 21 are connected in series, one end of the busbar 40 is connected to the first electrode 213a of one cell 21 in the adjacent cells 21. The other end of the bus bar 40 is connected to the second electrode 213 b of another cell 21 of the adjacent cells 21 . When the adjacent cells 21 are connected in parallel, one end of the bus bar 40 is connected to the first electrode 213a/second electrode 213b of one of the cells 21 in the adjacent cells 21, and the other end of the bus bar 40 One end is connected to the first electrode 213a/second electrode 213b of another cell 21 in the adjacent cell 21. It can be understood that when the adjacent cells 21 are connected in parallel, the two ends of the bus bar 40 are connected to The same electrode of adjacent battery cells 21 may be the first electrode 213a at the same time, or be the second electrode 213b at the same time. Optionally, the bus bar 40 is disposed on a side of the first wall 111 away from the cell assembly 20 .

In some embodiments, among two adjacent battery cells 21, one end of a bus bar 40 is connected to the first connecting portion 213aa of one of the battery cells 21, and the other end of a bus bar 40 is connected to The second connecting portion 213bb of the other cell 21 .

For the circuit board 50, the first conductive sheet 60 and the second conductive sheet 70, as shown in Figure 18 and Figure 19, the circuit board 50 is arranged in the first space, and one end of the first conductive sheet 60 connected to the circuit board 50, the other end of the first conductive sheet 60 is connected to the first electrode 213a of the cell 21, one end of the second conductive sheet 70 is connected to the circuit board 50, the The other end of the second conductive sheet 70 is connected to the second electrode 213 b of the cell 21 , so as to realize the electrical connection between the circuit board 50 and the cell assembly 20 . The circuit board 50 can be used to stabilize the voltage of the battery pack and protect the normal operation of the battery pack. At the same time, when the battery pack is in the process of discharging, the connection assembly 30 transmits information such as the detected voltage of the battery cell 21 to the The circuit board 50, when the battery power is too low, stops output power to protect the battery. When the battery pack is in the charging process, the circuit board 50 can automatically disconnect the charging circuit when the battery is fully charged. Avoid battery damage due to overcharging.

In some embodiments, the circuit board 50 includes a Battery Management System (BMS) board, and the BMS board can be used to control the charging and discharging of the battery cell 21 . In some embodiments, the circuit board 50 is connected to one end of the connecting component 30 , optionally, one end of the connecting component 30 is connected to the circuit board 50 through the fourth through hole 1115 .

In some embodiments, along the first direction X, the projection of the circuit board 50 is separated from the projection of the electric core 21 . Optionally, along the third direction Z, the projection of the circuit board 50 and the projection of the electric core 21 overlap.

As for the above-mentioned third insulating member 80, as shown in FIG. The first wall 111 of the first casing 11 is described above, and the third insulating member 80 covers the bus bar 40 and the connection assembly 30 . The third insulator 80 can be used to protect the bus bar 40 and the connection assembly 30 arranged on the first wall 111, reduce the contact between the bus bar 40 and the connection assembly 30 and external components, and at the same time protect the first battery pack. One side of the housing 11 plays a role of sealing.

It can be understood that: in order to reduce the contact between the bus bar 40 and the connection assembly 30 and external components and to seal the battery pack, it is not limited to using the third insulating member 80, and other methods can also be used, for example: adding resin to the first wall 111 Layers, such as glue filling, use the solidified glue to protect the bus bar 40 and the connection assembly 30. At the same time, when the battery pack falls to the ground, the solidified glue can play a buffer role, and more effectively protect the bus bar 40 and the connection assembly. Component 30 plays a protective role.

As shown in Figure 20, the assembly process of the battery pack in this embodiment includes:

Step S1: accommodate the circuit board 50 and the plurality of battery cells 21 in the first casing 11 and the second casing 12;

Step S2: Install multiple bus bars 40 and connection assemblies 30 on the first housing 11, and connect multiple bus bars 40 and connection assemblies 30 to the battery cell 21;

Step S3: The first conductive sheet 60 and the second conductive sheet 70 protrude from the first casing 11, and the first conductive sheet 60 and the second conductive sheet 70 are connected to the battery cell 21;

Step S4: disposing the third insulator 80 on the first housing 11 to cover the bus bar 40 and the connection assembly 30 .

In some embodiments, the battery pack assembly process may further include step S5: placing a flowing resin outside the first casing 11 and fixing it to form a resin layer, and the resin layer is used to connect the bus bars 40, The connection assembly 30 is fixed to the first housing 11 .

In some embodiments, in step S3, the first conductive sheet 60 and the second conductive sheet 70 protrude from the first housing 11, and the protruding first conductive sheet 60 facilitates the bending process in the subsequent process, and at the same time, can reduce The contact between the first conductive sheet 60 and the first housing 11 reduces damage to the first conductive sheet 60 .

The above is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process conversion made by using the specification and drawings of the application, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of this application in the same way.

Claims

A battery pack, characterized in that it comprises:

A cell assembly, the cell assembly includes a plurality of cells, the cell includes a cell casing, an electrode assembly, and an electrode, the electrode is connected to the electrode assembly, and the electrode includes a first electrode with opposite polarity an electrode and a second electrode;

A connection assembly, the connection assembly is electrically connected to the cell assembly, the connection assembly includes a first insulating member, a second insulating member and a conductive member, and along a first direction, the conductive member is at least partially located on the first Between the insulator and the second insulator, the first insulator is provided with a first opening;

a housing with a first space, the cell assembly is at least partially located in the first space, the housing includes a first wall and a first through hole, the first through hole runs through the first wall, Viewed along the first direction, the second electrode is at least partially located within the first through hole;

Along the first direction, projections of the first opening, projections of the conductive member, projections of the first through hole and projections of the second electrode overlap.
The battery pack according to claim 1, wherein:

The first electrode includes a first connecting portion, the second electrode includes a second connecting portion, the first connecting portion and the second connecting portion are respectively located at opposite ends of the cell, and the first connecting portion protruding from the cell housing, or,

The first connecting portion and the second connecting portion are located at the same end of the cell, and the first connecting portion protrudes from the second connecting portion in a direction opposite to the first direction.
The battery pack according to claim 2, wherein:

Along the first direction, the projection of the second connection part is arranged around the outside of the projection of the first connection part.
The battery pack according to claim 3, wherein:

The conductive element is connected to the second connecting portion.
The battery pack according to any one of claims 2-4, characterized in that,

The battery pack includes a plurality of bus bars, the plurality of bus bars are arranged on the first wall, the bus bars are arranged on the side of the first wall away from the battery cell assembly, and one bus bar It is connected with the first electrode and/or the second electrode of the adjacent cell.
The battery pack according to claim 5, wherein:

The connection mode of at least one bus bar to the first electrode and the second electrode includes one of the following:

a) The bus bar is connected to the first electrode of one battery cell, and is connected to the first electrode of another adjacent battery cell;

b) one said bus bar is connected to the second electrode of one battery cell, and is connected to the second electrode of another adjacent battery cell;

c) one said bus bar is connected to the first electrode of one battery cell, and is connected to the second electrode of another adjacent battery cell;

d) One said bus bar is connected to the second electrode of one battery cell, and is connected to the first electrode of another adjacent battery cell.
The battery pack according to claim 5, wherein:

The first wall is provided with a second through hole, and the first connecting portion is at least partially located in the second through hole viewed along the first direction.
The battery pack according to claim 5, wherein:

The second connection portion includes a first region;

The first wall is provided with a third through hole. Viewed along the first direction, the first region is at least partially located in the third through hole. Among the two adjacent battery cells, a bus bar One end is connected to the first connection portion of one of the cells, and the other end is connected to the first region of the other cell.
The battery pack according to claim 8, wherein:

Viewed along the first direction, the first region is located in the third through hole.
The battery pack according to claim 8, wherein:

The second connection part includes a second area, and among the two adjacently arranged cells, the second area of one cell is located between the first connection part of the cell and the first area of the other cell , viewed along the first direction, the first wall covers a second area of the battery core.
The battery pack according to claim 8, wherein:

The first wall includes a first part and a second part, the first through hole is located in the first part, the second through hole and the third through hole are located in the second part, along with the first In the opposite direction, the second portion protrudes from the first portion.
The battery pack according to claim 11, wherein:

The connecting component is arranged on the first part.
The battery pack according to claim 12, wherein:

The connection assembly is provided with a connection opening;

The first part is provided with a first protrusion, and the first protrusion is disposed in the connection opening.
The battery pack according to claim 4, wherein:

The conductive part includes a plurality of conductive metal parts, and the plurality of conductive metal parts are sequentially arranged at intervals along the second direction, and the lengths of the conductive metal parts are successively reduced along the third direction, wherein the third direction is vertical in the first direction and the second direction.
The battery pack according to claim 4, wherein:

The conductive part includes a plurality of conductive metal parts, and the plurality of conductive metal parts are sequentially arranged at intervals along the second direction, and each conductive metal part includes a first section and a second section separated from each other, and the first section A section is connected to the second electrode, and the second section is not electrically connected to the cell assembly.
The battery pack according to claim 4, wherein:

The battery pack includes a circuit board, the circuit board is arranged in the first space, the circuit board is electrically connected to the cell assembly, and the circuit board is connected to one end of the connection assembly.
The battery pack according to claim 16, wherein:

The housing includes a fourth through hole penetrating through the first wall, and one end of the conductive element is connected to the circuit board through the fourth through hole.
The battery pack according to claim 17, wherein:

Along the first direction, the projection of the circuit board is separated from the projection of the electric core.
The battery pack according to claim 17, wherein:

The plurality of electric cores are arranged in sequence along a third direction, and along the third direction, projections of the circuit board and projections of the electric cores overlap.
The battery pack according to claim 4, wherein, along the first direction, the first insulating member is closer to the first wall than the second insulating member.
The battery pack according to any one of claims 6-9, wherein the first wall includes a partition provided between the adjacent third through holes and the second through holes, along the In a third direction, the third through hole, the partition and the second through hole are arranged in sequence, and the third direction is perpendicular to the first direction.
The battery pack according to any one of claims 5-11, characterized in that the battery pack further comprises a third insulator, the third insulator is provided on the outer surface of the casing, and the third insulator Insulators cover the busbars and connection assemblies.
The battery pack according to claim 1, wherein the connection assembly is used to collect at least one of voltage, current or temperature of the battery cell.
The battery pack according to claim 1, wherein:

The second insulating member is provided with a second opening. Along the first direction, the projection of the first opening, the projection of the second opening, the projection of the conductive member, and the projection of the first through hole And the projections of the second electrode overlap.
An electrical device, characterized by comprising the battery pack according to any one of claims 1-24.