CN213752868U

CN213752868U - Battery pack, battery pack, and electric device

Info

Publication number: CN213752868U
Application number: CN202022832576.8U
Authority: CN
Inventors: 周权; 吴明杰; 莫胜
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-07-20
Anticipated expiration: 2030-11-30

Abstract

A battery pack includes a case, a first electric core assembly, a second electric core assembly, and a first conductive member. The housing includes a first housing and a mounting bracket. First electric core subassembly and second electric core subassembly are located in the first casing, include a plurality of first electric cores and second electric core respectively, and first anodal ear and the first negative pole ear range upon range of connection between the adjacent first electric core, the anodal ear of second and the range upon range of connection of second negative pole ear between the adjacent second electric core. Establish first through-hole and second through-hole on the installing support, the first anodal ear and the first negative pole ear of adjacent first electric core stretch out from first through-hole and connect, and the anodal ear of second and the second negative pole ear of adjacent second electric core stretch out from the second through-hole and connect. The first conductive piece is connected with the first battery cell and the second battery cell. The battery pack has the advantages that the connection positions of the lugs and the conductive pieces are stable by arranging the mounting support. The application also provides a battery pack with the battery pack and an electric device with the battery pack.

Description

Battery pack, battery pack, and electric device

Technical Field

The present application relates to the field of batteries, and in particular, to a battery pack, a battery pack having the battery pack, and an electric device having the battery pack.

Background

In the prior art, the lugs of a plurality of cells in the battery pack are often directly connected, the structure for fixing the lugs and the connecting piece thereof is lacked in the battery pack, and the circuit board is also directly arranged on the surface of one side of the battery pack and connected with the lugs. When the battery pack falls or vibrates, the structures such as the lug and the circuit board can shake along with the battery pack, so that the problem of short circuit in the battery pack is easily caused.

SUMMERY OF THE UTILITY MODEL

In view of the above situation, the present application provides a battery pack, a battery pack having the battery pack, and an electric device having the battery pack, wherein the mounting bracket is provided to arrange a plurality of tabs, conductive members, and a circuit board of the battery pack, so that the connection positions between the plurality of tabs, conductive members, and the circuit board are stable, and the problem of short circuit in the battery pack caused by vibration is reduced.

Embodiments of the present application provide a battery pack including a housing first and second electrical core assemblies. The shell comprises a first shell and a mounting bracket, and the first shell is provided with an accommodating space. The first electric core assembly and the second electric core assembly are arranged in the accommodating space. First electric core subassembly includes a plurality of first electric cores that pile up the setting, first electric core includes first anodal ear and first negative pole ear, and is adjacent between the first electric core, first anodal ear and the range upon range of connection of first negative pole ear. The second electric core assembly comprises a plurality of second electric cores which are stacked, each second electric core comprises a second positive electrode lug and a second negative electrode lug, and the second positive electrode lug and the second negative electrode lug are connected in a stacking mode between the second electric cores. The mounting bracket is provided with a plurality of first through holes and a plurality of second through holes, and is adjacent to the first positive lug and the first negative lug of the first battery cell respectively extend out of the two adjacent first through holes and are connected with the outer surface of the mounting bracket, and the second positive lug and the second negative lug of the second battery cell respectively extend out of the two adjacent second through holes and are connected with the outer surface of the mounting bracket. The battery pack further comprises a first conductive piece, the first conductive piece comprises a first welding portion and a second welding portion, the first welding portion is connected to a first positive lug and a first negative lug which are connected with each other, and the second welding portion is connected to a second positive lug and a second negative lug which are connected with each other.

In some embodiments, the first conductive member includes a first connection portion connecting the first welding portion and the second welding portion, the first welding portion and the second welding portion are exposed at the outer surface of the mounting bracket, the first welding portion is welded to at least one of the first positive tab and the first negative tab, and the second welding portion is welded to at least one of the second positive tab and the second negative tab.

In some embodiments, the mounting bracket is made of a resin material, and the first conductive member is insert-molded and fixed to the mounting bracket.

In some embodiments, the battery pack further includes a circuit board fixed to the mounting bracket, and a plurality of second conductive members having one end connected to the first conductive member and the other end connected to the circuit board.

In some embodiments, the first electrically-conductive member is located between the circuit board and the mounting bracket.

In some embodiments, the second conductive member includes a first connection portion, a buffer portion, and a second connection portion, the buffer portion connects the first connection portion and the second connection portion, the first connection portion is welded to the circuit board, and the second connection portion is welded to the first conductive member.

In some embodiments, the outer surface of the mounting bracket is further provided with a plurality of limiting members, and the first conductive member is disposed between two adjacent limiting members along the stacking direction of the first electrical core.

In some embodiments, the outer surface of the mounting bracket is further provided with a first positioning element, the first conductive element is provided with a first positioning hole, and the first positioning element is arranged in the first positioning hole.

In some embodiments, a heat dissipation opening is further disposed between adjacent first through holes and adjacent second through holes along the stacking direction of the first battery cells.

In some embodiments, the mounting bracket is further provided with a first supporting member and a second supporting member, the first supporting member is configured to support the first positive tab of the outermost first battery cell, and the second supporting member is configured to support the second negative tab of the outermost second battery cell.

In some embodiments, the mounting bracket further includes a first positioning portion and a second positioning portion near the inner surface of the core assembly, the first positioning portion is disposed between adjacent first through holes, and the second positioning portion is disposed between adjacent second through holes.

In some embodiments, a plurality of first receiving cavities and a plurality of second receiving cavities are disposed in the first housing, at least one first battery cell is disposed in each first receiving cavity, and at least one second battery cell is disposed in each second receiving cavity.

In some embodiments, a first recess is disposed at a bottom of the first receiving cavity, a second recess is disposed at a bottom of the second receiving cavity, the first recess and the second recess are configured to receive a resin layer, and after the resin layer is fixed, the first battery cell and the second battery cell are adhesively fixed to the first casing.

In some embodiments, a first contour groove is formed in a side wall of the first accommodating cavity, a second contour groove is formed in a side wall of the second accommodating cavity, a side edge of the first battery cell is accommodated in the first contour groove, and a side edge of the second battery cell is accommodated in the second contour groove.

The embodiment of the application also provides a battery pack, which comprises a shell and the battery pack, wherein the battery pack is contained in the shell.

The embodiment of the application also provides an electric device, which comprises the battery pack

Above-mentioned group battery is through setting up the installing support, and the installing support is all located to a plurality of utmost point ears of group battery, electrically conductive piece and circuit board for the hookup location between a plurality of utmost point ears, electrically conductive piece and the circuit board is stable, reduces the interior short circuit problem of group battery because of the vibration leads to.

Drawings

Fig. 1 is a schematic perspective view of a battery pack in an embodiment.

Fig. 2 is an exploded structural view of the battery pack shown in fig. 1.

Fig. 3 is a perspective view illustrating a mounting bracket of the battery pack of fig. 1.

Fig. 4 is a schematic perspective view of the mounting bracket shown in fig. 3 in another orientation.

Fig. 5 is a schematic perspective view of a first case of the battery pack shown in fig. 1.

Fig. 6 is a schematic structural view of the first casing shown in fig. 5 after the structure of the shearing part.

Fig. 7 is an exploded view of a battery pack in one embodiment.

Fig. 8 is a perspective view illustrating a cell assembly of the battery pack of fig. 7.

Fig. 9 is an exploded view of the electric core assembly shown in fig. 8.

Fig. 10 is a top view of a cell assembly of the battery pack of fig. 7.

Fig. 11 is a perspective view of the electric core assembly in one embodiment.

Fig. 12 is an exploded view of the electric core assembly shown in fig. 11.

Fig. 13 is a perspective view of an electrical core assembly in one embodiment.

Fig. 14 is an exploded view of the electric core assembly shown in fig. 13.

Fig. 15 is a schematic structural diagram of a battery pack in an embodiment.

Description of the main element symbols:

battery pack 100

Electrical core assembly 10

First electric core assembly 11

First battery cell 110

First positive tab 111

First negative tab 112

The first body portion 113

Second electric core assembly 12

Second cell 120

Second positive tab 121

Second negative tab 122

Second body part 123

First conductive member 20

First welding part 21

Second weld 22

Connecting part 23

First positioning hole 24

Circuit board 30

Second conductive member 40

First connection portion 41

Second connecting portion 42

Buffer 43

Housing 50

First housing 51

First housing chamber 511

First recess 5111

First contour groove 5112

Second accommodating cavity 512

Second concave part 5121

Second contour groove 5122

Second case 52

Fixed support 53

First positioning groove 531

Second positioning groove 532

Mounting bracket 54

First via 541

Second through hole 542

Limiting piece 543

First positioning member 544

Heat dissipation opening 545

First support 546

Second support 547

First positioning portion 548

Second positioning part 549

Spacer 60

Isolation part 61

Mounting bracket 70

Opening 71

Battery pack 200

Housing 201

Connector 202

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The embodiment of the application provides a battery pack, which comprises a first electric core assembly and a second electric core assembly of a shell. The shell comprises a first shell and a mounting bracket, and the first shell is provided with an accommodating space. The first electric core assembly and the second electric core assembly are arranged in the accommodating space. First electric core subassembly includes a plurality of first electric cores that pile up the setting, first electric core includes first anodal ear and first negative pole ear, and is adjacent between the first electric core, first anodal ear and the range upon range of connection of first negative pole ear. The second electric core assembly comprises a plurality of second electric cores which are stacked, each second electric core comprises a second positive electrode lug and a second negative electrode lug, and the second positive electrode lug and the second negative electrode lug are connected in a stacking mode between the second electric cores. The mounting bracket is provided with a plurality of first through holes and a plurality of second through holes, and is adjacent to the first positive lug and the first negative lug of the first battery cell respectively extend out of the two adjacent first through holes and are connected with the outer surface of the mounting bracket, and the second positive lug and the second negative lug of the second battery cell respectively extend out of the two adjacent second through holes and are connected with the outer surface of the mounting bracket. The battery pack further comprises a first conductive piece, the first conductive piece comprises a first welding portion and a second welding portion, the first welding portion is connected to a first positive lug and a first negative lug which are connected with each other, and the second welding portion is connected to a second positive lug and a second negative lug which are connected with each other.

Above-mentioned group battery is through setting up the installing support, and the installing support is all located to a plurality of utmost point ears of group battery, electrically conductive piece for the hookup location between a plurality of utmost point ears, the electrically conductive piece is stable, reduces the interior short circuit problem of group battery because of the vibration leads to.

Some embodiments of the present application are described in detail. In the following embodiments, features of the embodiments may be combined with each other without conflict.

Referring to fig. 1 and 2, the battery pack 100 includes a battery module 10, a first conductive member 20, a circuit board 30, a second conductive member 40, and a case 50. The battery assembly 10 includes a first battery assembly 11 and a second battery assembly 12 connected in parallel, the first battery assembly includes a plurality of first battery cells 110 arranged in a stacked manner, the second battery assembly includes a plurality of second battery cells 120 arranged in a stacked manner, and the first battery assembly 11 and the second battery assembly 12 will be specifically described in other figures. The first conductive member 20 is electrically connected to the first electric core assembly 11 and the second electric core assembly 12. One end of the second conductive member 40 is electrically connected to the first conductive member 20, and the other end of the second conductive member 40 is electrically connected to the circuit board 30. The first electric core assembly 11 and the second electric core assembly 12 of the electric core assembly 10 are accommodated in the housing 50. The housing 50 comprises a first housing 51 and a mounting bracket 54, the electric core assembly 10 is accommodated in the first housing 51, and the mounting bracket 54 is arranged at an opening end of the first housing 51. The mounting bracket 54 is made of a resin material, the first conductive member 20 is embedded and fixed to the mounting bracket 54, or the first conductive member 20 is detachably fixed to the mounting bracket 54, in other embodiments, the mounting bracket 54 may be made of other non-conductive materials, and the first conductive member 20 may be fixed to an outer surface of the mounting bracket 54. The first conductive member 20 includes a first welding portion 21 and a second welding portion 22, the first welding portion 21 and the second welding portion 22 are exposed on the outer surface of the mounting bracket 54, the first welding portion 21 is welded to at least one of the first positive tab 111 and the first negative tab 112, and the second welding portion 22 is welded to at least one of the second positive tab 121 and the second negative tab 122.

In some embodiments, the first electrically-conductive member 20 and the circuit board 30 are both disposed on an outer surface of the mounting bracket 54, the first electrically-conductive member 20 being located between the circuit board 30 and the mounting bracket 54. The circuit board 30 is secured to the mounting bracket 54. The housing 50 may further include a cover plate (not shown) disposed on an outer surface of the mounting bracket 54, and the circuit board 30 is received in the cover plate.

In this example, the circuit board 30 is a circuit board provided with a battery management system, in other embodiments, the first conductive component 20 may be directly welded on the circuit board 30, a circuit connected to the first conductive component 20 is disposed on the circuit board 30 to realize the collection and control of the electric core components 10, or a hole may be formed in the circuit board 30 to facilitate the electrode tab to pass through the hole, and the connection of the positive electrode tab and the negative electrode tab is implemented with the outer surface of the circuit board 30 to connect adjacent electric cores in series.

With reference to fig. 3, a plurality of first through holes 541 and a plurality of second through holes 542 are formed in the mounting bracket 54, the first positive tab 111 and the first negative tab 112 adjacent to the first electrical core respectively extend out from two adjacent first through holes 541 and are connected to the outer surface of the mounting bracket 54 away from the first electrical core assembly, and the second positive tab 121 and the second negative tab 122 adjacent to the second electrical core respectively extend out from two adjacent second through holes 542 and are connected to the outer surface of the mounting bracket 54 away from the first electrical core assembly. Along the stacking direction of the first battery cell, a heat dissipation opening 545 is further disposed between the adjacent first through hole 541 and the adjacent second through hole 542, and is used for discharging heat generated by the battery cell assembly 10 in the charging and discharging process.

The mounting bracket 54 is used for fixing and supporting the tab of the core assembly 10, the first conductive member 20 and the circuit board 30. The first conductive member 20 may be fixed to the mounting bracket 54 by thermal melting or insert molding, which is advantageous for automated production, or the first conductive member 20 may be detachably fixed to the mounting bracket 54. The pole lugs of the first battery cell and the second battery cell respectively pass through the first through hole 541 and the second through hole 542, and the outer surface of the mounting support 54 is favorable for providing support for the mounting and fixing of the pole lugs, so that the pole lugs can be conveniently welded. The circuit board 30 is fixedly disposed on the mounting bracket 54, which facilitates the welding and fixing of the second conductive member 40 and the circuit board 30.

The outer surface of the mounting bracket 54 is further provided with a plurality of limiting members 543 and a first positioning member 544 for fixing the mounting position of the first conductive members 20 and preventing the adjacent first conductive members 20 from contacting each other to cause a short circuit problem. Along the stacking direction of the first battery cells, each of the first conductive members 20 is disposed between two adjacent limiting members 543. The first conductive member 20 is provided with a first positioning hole 24, and the first positioning member 544 is disposed in the first positioning hole 24. In this embodiment, the first positioning element 544 is disposed between the adjacent positioning elements 543, in other embodiments, the first positioning element 544 is disposed at another portion of the mounting bracket 54, and in addition, the first conductive member 20 may also be fixed to the mounting bracket 54 by performing a hot melting process on the first positioning element 544.

Referring again to fig. 2 and 3, in some embodiments, the mounting bracket 54 further includes a first support 546 and a second support 547. The first support 546 is used to support the first positive tab 111 of the outermost first cell in the cell assembly 10, and the second support 547 is used to support the second negative tab 122 of the outermost second cell in the cell assembly 10, so as to connect the total positive output terminal and the total negative output terminal of the battery pack 100. Specifically, the first support 546 and the second support 547 protrude from the outer surface of the mounting bracket 54, the first positive tab 111 of the outermost first cell in the cell assembly 10 is bent toward the first support 546, the end of the first support 546 supports the bent portion of the first positive tab 111, the second negative tab 122 of the outermost second cell in the cell assembly 10 is bent toward the second support 547, and the end of the second support 547 supports the bent portion of the second negative tab 122.

Referring to fig. 4, in some embodiments, the inner surface of the mounting bracket 54 facing the core assembly 10 further includes a first positioning portion 548 and a second positioning portion 549, the first positioning portion 548 is disposed between adjacent first through holes 541, and the second positioning portion 549 is disposed between adjacent second through holes 542. The first positioning portion 548 is disposed between the tabs of the adjacent first cells, and the second positioning portion 549 is disposed between the tabs of the adjacent second cells, so as to reduce the problem of internal short circuit of the cell assembly 10.

Referring to fig. 5, in some embodiments, a plurality of first accommodating cavities 511 and a plurality of second accommodating cavities 512 are disposed in the first housing 51. At least one first battery cell is arranged in each first accommodating cavity 511, and at least one second battery cell is arranged in each second accommodating cavity 512. The side wall of the first accommodating cavity 511 is provided with a first contour groove 5112, and the side wall of the second accommodating cavity 512 is provided with a second contour groove 5122. The side edge of the first battery cell is accommodated in the first contour groove 5112, and the side edge of the second battery cell is accommodated in the second contour groove 5122.

Referring to fig. 6, in some embodiments, a first concave portion 5111 is disposed at the bottom of the first receiving cavity 511, and a second concave portion 5121 is disposed at the bottom of the second receiving cavity 512. The first recess 5111 and the second recess 5121 are configured to accommodate a resin layer, and the resin layer fixes the first cell and the second cell to the first case in an adhering manner. The resin layer includes but is not limited to structural adhesive, potting adhesive, etc., and the resin layer can also be formed by pouring and filling the melted plastic particles into the recessed portion.

Referring to the structure of another battery pack described with reference to fig. 7 to 10, the housing 50 includes a first housing 51, a second housing 52 and a fixing bracket 53, and the battery assembly 10 is accommodated in the first housing 51 and the second housing 52. Specifically, the first electric core assembly 11 is accommodated in the first housing 51, and the second electric core assembly 12 is accommodated in the second housing 52. The fixing bracket 53 is used for fixing the first electric core assembly 11 and the second electric core assembly 12. Along the width direction of the first electric core assembly 11, that is, the direction indicated by the arrow a in fig. 7, the first electric core assembly 11 and the second electric core assembly 12 are disposed at opposite sides of the fixing bracket 53. The two opposite sides of the fixing bracket 53 are respectively provided with a first positioning groove 531 and a second positioning groove 532, and along the width direction of the cell assembly 10, one side of the first cell 110 is accommodated in the first positioning groove 531, and one side of the second cell 120 is accommodated in the second positioning groove 532.

Referring to fig. 7 and 8 again, the first core cell assembly 11 and the second core cell assembly 12 are disposed along a width direction of the first core cell assembly 11. The width direction of the first electric core assembly 11 is the direction indicated by arrow a in fig. 7, and the first conductive member 20 is electrically connected to the first electric core assembly 11 and the second electric core assembly 12. One end of the second conductive member 40 is electrically connected to the first conductive member 20, and the other end of the second conductive member 40 is electrically connected to the circuit board 30.

The first battery core assembly 11 includes a plurality of first battery cells 110, and the plurality of first battery cells 110 are stacked in a thickness direction of the first battery cells 110. Each first cell 110 includes a first positive tab 111, a first negative tab 112, and a first body portion 113. The first positive tab 111 and the first negative tab 112 are disposed on the same side of the first body 113, and the first positive tab 111 and the first negative tab 112 extend out of the first body 113 along the length direction of the first body 113. Between adjacent first battery cells 110, a first positive tab 111 of one first battery cell 110 is connected to a first negative tab 112 of another first battery cell 110. The second battery core assembly 12 includes a plurality of second battery cells 120, and the plurality of second battery cells 120 are stacked in the thickness direction of the second battery cells 120, in this embodiment, the stacking direction of the first battery cells 110 is the same as the stacking direction of the second battery cells 120. The second battery cell includes a second positive tab 121, a second negative tab 122, and a second body portion 123. The second positive tab 121 and the second negative tab 122 are disposed on the same side of the second body 123, and the second positive tab 121 and the second negative tab 122 extend out of the second body 123 along the length direction of the second body 123. Between adjacent second battery cells 120, a second positive tab 121 of one second battery cell 120 is connected to a second negative tab 122 of another second battery cell 120.

In some implementations of the present application, the width direction of the first cell assembly 11, the width direction of the second cell assembly 12, and the width direction of the first cell 110 are the same, specifically, the width direction of the first cell assembly 11 is perpendicular to the length direction and the thickness direction of the first cell 110, and the width direction of the second cell assembly 12 is perpendicular to the length direction and the thickness direction of the first cell 110. In fig. 1, a direction indicated by an arrow B is a longitudinal direction of the first battery cell 110, and a direction indicated by an arrow C is a thickness direction of the first battery cell 110.

With reference to fig. 9, the first conductive member 20 includes a first soldering portion 21, a second soldering portion 22, and a connecting portion 23 connecting the first soldering portion 21 and the second soldering portion 22. The first welding portion 21 is welded to the first positive tab 111 and the first negative tab 112 connected to each other, and the second welding portion 22 is welded to the second positive tab 121 and the second negative tab 122 connected to each other. Specifically, the first welding portion 21 is disposed between a first positive tab 111 and a first negative tab 112, the first welding portion 21 is welded to the first positive tab 111 and the first negative tab 112, or the first positive tab 111 is disposed between the first welding portion 21 and the first negative tab 112, the first welding portion 21 is welded to the first positive tab 111, or the first negative tab 112 is disposed between the first welding portion 21 and the first positive tab 111, and the first welding portion 21 is welded to the first negative tab 112. In this embodiment, the first negative tab 112 is disposed between the first welding portion 21 and the first positive tab 111, and the first welding portion 21 is welded to the first negative tab 112. The second welding portion 22 is disposed between the second positive tab 121 and the second negative tab 122, the second welding portion 22 is welded to the second positive tab 121 and the second negative tab 122, or the second positive tab 121 is disposed between the second welding portion 22 and the second negative tab 122, the second welding portion 22 is welded to the second positive tab 121, or the second negative tab 122 is disposed between the second welding portion 22 and the second positive tab 121, and the second welding portion 22 is welded to the second negative tab 122. In this embodiment, the second negative tab 122 is disposed between the second welding portion 22 and the second positive tab 121, and the second welding portion 22 is welded to the second negative tab 122.

In an embodiment of the present application, the first battery cell 110 and the second battery cell 120 are soft package battery cells. Between adjacent first battery cells 110, a first positive tab 111 of one first battery cell 110 and a first negative tab 112 of another first battery cell 110 are welded in a stacked manner, and between adjacent second battery cells 120, a second positive tab 121 of one second battery cell 120 and a second negative tab 122 of another second battery cell 120 are welded in a stacked manner. In another embodiment of the present application, the first core assembly 11 and the second core assembly 12 may also be disposed along the stacking direction of the first battery cells 110.

The first battery cell 110 and the second battery cell 120 are connected in parallel to form a circuit unit through the first conductive member 20, and then connected in series with an adjacent group of circuit units. In a single circuit unit, when voltages of the first battery cell 110 and the second battery cell 120 connected in parallel are not consistent, a circulation current may occur to voltages of the first battery cell 110 and the second battery cell 120, and a direction of the circulation current is from a battery cell with a higher voltage (a discharging direction), and flows back into a battery cell with a lower voltage (a charging direction), so that voltages of the first battery cell 110 and the second battery cell 120 are balanced, a voltage difference between the first battery cell 110 and the second battery cell 120 is reduced, it is ensured that the first battery cell 110 and the second battery cell 120 can be charged and discharged in an equivalent manner in a using process, a problem that a single battery cell cannot be fully charged or cannot be used due to unbalanced voltage is reduced, a cycle performance of the battery cell is improved, and a service life of the battery cell is prolonged. The battery pack 100 performs voltage equalization on a plurality of first electric cores 110 and second electric cores 120 through a plurality of first conductive members 20, reduces the voltage difference between the first electric core assembly 11 and the second electric core assembly 12, and prolongs the service life of the electric core assembly 10. In addition, according to the ohm's law of circuity, the magnitude of the circulating current is equal to the sum of the voltage difference/the two internal resistances, so even if the voltage difference is small, because the internal resistance of the battery cell is small, a large loop current can be formed instantly, when the circulating current occurs, the current also passes through the first conductive piece 20, the power consumption can be increased by setting the material and the size of the first conductive piece 20, so that the balance is performed, and the impact of the instant large current on the battery cell and the circuit board 30 is reduced. In addition, compare in the mode of connecting copper bar and a plurality of utmost point ear welded, first positive negative pole ear, the positive negative pole ear direct weld of second can reduce and generate heat, reduce the structure.

In this embodiment, the first conductive device 20 is a copper bar, in other embodiments, the first conductive device 20 may also be a wire harness, or a copper foil disposed on the circuit board 30, which is not limited to the above, and the first electrical core 110 and the second electrical core 120 may be electrically connected.

Referring to fig. 9 again, in some embodiments, the first cell assembly 11 includes N first cells 110, the second cell assembly 12 includes N second cells 120, and the battery pack 100 includes N-1 first conductive members 20, where N is a natural integer. The first welding portion 21 of the first conductive member 20 is connected to the first positive tab 111 and the first negative tab 112 in a stacked manner, and the second welding portion 22 of the first conductive member 20 is connected to the second positive tab 121 and the second negative tab 122 in a stacked manner. In some embodiments, the battery pack 100 further includes a spacer 60 disposed between the cell assembly 10 and the circuit board 30. Along the thickness direction of the first battery cell 110, a plurality of isolation portions 61 are disposed on the isolation member 60, and each first conductive member 20 is disposed between two adjacent isolation portions 61 to prevent the adjacent first conductive members 20 from contacting each other.

The second conductive member 40 includes a first connection portion 41, a second connection portion 42, and a buffer portion 43. The buffer portion 43 connects the first connection portion 41 and the second connection portion 42, the first connection portion 41 connects the circuit board 30, and the second connection portion 42 connects the first conductive member 20. In this embodiment, the first connection portion 41 and the second connection portion 42 are connected to the circuit board 30 and the first conductive member 20 by welding, and in other embodiments, the first connection portion 41 and the second connection portion 42 may be connected to the circuit board 30 and the first conductive member 20 by bonding with a conductive adhesive, and the like, which is not limited in this application. The cushioning portion 43 has elasticity, and its structure includes, but is not limited to, a "bow" shape or a wave shape. In the battery pack 100, the number of the second conductive members 40 is N-1, which is the same as the number of the first conductive members 20. N-1 second conductive members 40 are respectively disposed on opposite sides of the circuit board 30 and connected to an end of the first conductive member 20 not covered by the circuit board 30, and specifically, the second conductive member 40 is connected to the first welding portion 21 or the second welding portion 22 of the first conductive member 20.

The first conductive element 20 is mainly used to balance the voltage between the cells connected in parallel, and the second conductive element 40 is mainly used to collect the information of the cells. The second is directly connected with first electrically conductive 20 for 40, can once gather the information of two adjacent electric cores, needs a collection piece for an electric core of prior art, and the technical scheme of this application has reduced the quantity of gathering the piece.

Referring to fig. 10, in one embodiment of the present application, the first battery cells 110 and the second battery cells 120 are arranged in a one-to-one correspondence along a width direction of the first battery cell 110, wherein the first negative tab 112 and the second positive tab 121 are disposed between the first positive tab 111 and the second negative tab 122, or the first positive tab 111 and the second negative tab 122 are disposed between the first negative tab 112 and the second positive tab 121, and lengths of the plurality of first conductive members 20 connecting the first battery assembly 11 and the second battery assembly 12 are equal; alternatively, in another embodiment, referring to fig. 13, the first positive tab 111 and the second positive tab 121 are disposed between the first negative tab 112 and the second negative tab 122, and lengths of the first conductive members 20 connecting the first core assembly 11 and the second core assembly 12 are not equal.

Referring to fig. 11 and 12, in some embodiments, the battery pack 100 further includes a mounting bracket 70 disposed on a top surface of the battery pack assembly 10. The mounting bracket 70 is provided with a plurality of openings 71. First positive tab 111 and first negative tab 112 of a first plurality of cells 110 pass through opening 71 in mounting bracket 70 and are attached to a first surface of mounting bracket 70 facing away from the cell assembly 10. Second positive tab 121 and second negative tab 122 of a second plurality of cells 120 pass through opening 71 in mounting bracket 70 and are attached to a first surface of mounting bracket 70 facing away from the cell assembly 10. The mounting bracket 70 is a non-conductive member. The first conductive member 20 may be fixedly disposed on a first surface of the mounting bracket 70 facing away from the electrical core assembly 10 by riveting, bonding, or the like.

Referring to fig. 13 and 14, in another embodiment, in a width direction of the first battery cell 110, the first battery cell 110 and the second battery cell 120 are arranged in a one-to-one correspondence manner, wherein the first negative tab 112 and the second negative tab 122 are disposed between the first positive tab 111 and the second positive tab 121; or, the first positive tab 111 and the second positive tab 121 are disposed between the first negative tab 112 and the second negative tab 122, and lengths of two adjacent first conductive pieces 20 are not equal in order to match arrangement positions of the first battery cell 110 and the second battery cell 120. Specifically, the length of the nth first conductive member 20 is different from the length of the (N + 1) th first conductive member 20, and the length of the nth first conductive member 20 is the same as the length of the (N + 2) th first conductive member 20.

The structure of the cell assembly 10 and the housing 50 in this application can be combined to form different embodiments, for example, the cell assembly in fig. 11 is used in the battery pack in fig. 1, or the cell assembly in the embodiment of the battery pack in fig. 11 can be combined with the first housing in fig. 1, and those skilled in the art can make various combinations without limitation.

Referring to fig. 15, a battery pack 200 including a housing 201 and the battery pack 100 according to any one or a combination of the above embodiments is also provided. The battery pack 100 is housed in the case 201. The surface of the housing 201 is also provided with a connector 202, and the connector 202 is electrically connected with the battery pack 100.

The present application also provides an electric device (not shown) including a body and the battery pack 100 or the battery pack 200 of the above embodiment, wherein the battery pack 200 is disposed in the body. Further, the power consumption device can be electric motor car, electric bus, electric automobile car, energy storage equipment, electric bicycle, flight equipment etc. correspondingly, the body is body construction, battery package 200 is located in the automobile body to supply power.

It is understood that in other embodiments, the powered device may be a handheld powered device, such as a vacuum cleaner, a lawn mower, or other device.

Although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present application.

Claims

1. A battery pack, comprising:

the shell comprises a first shell and a mounting bracket, wherein the first shell is provided with an accommodating space;

the first battery core assembly is arranged in the accommodating space and comprises a plurality of first battery cells which are stacked, each first battery cell comprises a first positive electrode lug and a first negative electrode lug, and the first positive electrode lug and the first negative electrode lug are connected in a stacked mode between every two adjacent first battery cells;

the second battery core assembly is arranged in the accommodating space and comprises a plurality of second battery cells which are stacked, each second battery cell comprises a second positive electrode lug and a second negative electrode lug, and the second positive electrode lug and the second negative electrode lug are connected in a stacking manner between every two adjacent second battery cells;

the method is characterized in that: the mounting bracket is provided with a plurality of first through holes and a plurality of second through holes, a first positive lug and a first negative lug adjacent to the first electric core respectively extend out of two adjacent first through holes and are connected with the outer surface, far away from the first electric core assembly, of the mounting bracket, and a second positive lug and a second negative lug adjacent to the second electric core respectively extend out of two adjacent second through holes and are connected with the outer surface, far away from the first electric core assembly, of the mounting bracket;

the battery pack further comprises a first conductive piece, the first conductive piece comprises a first welding portion and a second welding portion, the first welding portion is connected to a first positive lug and a first negative lug which are connected with each other, and the second welding portion is connected to a second positive lug and a second negative lug which are connected with each other.

2. The battery pack according to claim 1, wherein the first conductive member includes a first connection portion connecting the first welding portion and the second welding portion, the first welding portion and the second welding portion are exposed at an outer surface of the mounting bracket, the first welding portion is welded to at least one of the first positive tab and the first negative tab connected to each other, and the second welding portion is welded to at least one of the second positive tab and the second negative tab connected to each other.

3. The battery pack according to claim 2, wherein the mounting bracket is made of a resin material, and the first conductive member is insert-molded and fixed to the mounting bracket.

4. The battery pack according to any one of claims 1 to 3,

the battery pack further comprises a circuit board and a plurality of second conductive pieces, the circuit board is fixed on the mounting support, one end of each second conductive piece is connected with the corresponding first conductive piece, and the other end of each second conductive piece is connected with the circuit board.

5. The battery pack of claim 4, wherein the first electrically conductive member is positioned between the circuit board and the mounting bracket.

6. The battery pack according to claim 5, wherein the second conductive member includes a first connection portion, a buffer portion, and a second connection portion, the buffer portion connecting the first connection portion and the second connection portion, the first connection portion being welded to the circuit board, the second connection portion being welded to the first conductive member.

7. The battery pack of claim 5, wherein the outer surface of the mounting bracket is further provided with a plurality of limiting members, and the first conductive member is disposed between two adjacent limiting members along the stacking direction of the first battery cells.

8. The battery pack of claim 5, wherein the mounting bracket further comprises a first positioning member disposed on an outer surface thereof, the first conductive member having a first positioning hole therein, the first positioning member being disposed in the first positioning hole.

9. The battery pack of claim 5, wherein heat dissipation ports are further disposed between adjacent first through holes and adjacent second through holes along the stacking direction of the first cells.

10. The battery pack of claim 5, wherein the mounting bracket further comprises a first support member and a second support member, the first support member is configured to support the first positive tab of the outermost first cell, and the second support member is configured to support the second negative tab of the outermost second cell.

11. The battery pack according to claim 5, wherein the mounting bracket further comprises a first positioning portion and a second positioning portion adjacent to the inner surface of the core assembly, the first positioning portion being disposed between adjacent first through holes, and the second positioning portion being disposed between adjacent second through holes.

12. The battery pack of claim 5, wherein a plurality of first receiving cavities and a plurality of second receiving cavities are formed in the first housing, at least one first battery cell is formed in each first receiving cavity, and at least one second battery cell is formed in each second receiving cavity.

13. The battery pack of claim 12, wherein a first recess is formed at a bottom of the first receiving cavity, a second recess is formed at a bottom of the second receiving cavity, the first recess and the second recess are configured to receive a resin layer, and the resin layer is fixed to adhesively fix the first cell and the second cell to the first housing.

14. The battery pack of claim 12, wherein a side wall of the first housing cavity is provided with a first contour groove, a side wall of the second housing cavity is provided with a second contour groove, a side edge of the first cell is received in the first contour groove, and a side edge of the second cell is received in the second contour groove.

15. A battery pack comprising a housing and the battery pack of any one of claims 1 to 14, said battery pack being housed in said housing.

16. An electric device comprising the battery pack according to claim 15.