CN116569405A

CN116569405A - Battery pack and electricity utilization device

Info

Publication number: CN116569405A
Application number: CN202080107415.2A
Authority: CN
Inventors: 周权; 吴明杰
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2023-08-08
Also published as: WO2022110192A1

Abstract

A battery pack includes a cell assembly and a plurality of first conductive members. The battery cell assembly comprises a first battery cell assembly and a second battery cell assembly which are connected in parallel. The first cell assembly comprises a plurality of first cells which are arranged in a stacked manner. The first battery cell comprises a first positive electrode lug and a first negative electrode lug. The first positive electrode lug and the first negative electrode lug of the adjacent first battery cell are connected. The second cell assembly comprises a plurality of second cells which are arranged in a stacked manner. The second battery cell comprises a second positive electrode lug and a second negative electrode lug. The second positive electrode lug and the second negative electrode lug of the adjacent second battery cell are connected. The first conductive piece comprises a first welding part and a second welding part, the first welding part is welded on the first positive electrode lug and the first negative electrode lug which are connected with each other, and the second welding part is welded on the second positive electrode lug and the second negative electrode lug which are connected with each other, so that the connecting structure is simplified, the cost is reduced, and the occupied space is reduced. The application also provides an electric device with the battery pack.

Description

Battery pack and electricity utilization device

Technical Field

The present disclosure relates to the field of batteries, and more particularly, to a battery pack and an electric device having the same.

Background

In the prior art, when the single batteries form a battery pack, a conductive copper bar is generally used to connect a plurality of single batteries to realize series-parallel connection of the battery cells. The conductive copper bar has the defects of complex structure, high manufacturing cost, large occupied space and the like, and is not beneficial to the miniaturization development of the battery pack.

Disclosure of Invention

In view of the above-mentioned situation, the present application provides a battery pack and an electric device having the same, wherein the battery pack is electrically connected between a first electric core and a second electric core in an electric core assembly through a plurality of first conductive members, so as to simplify a connection structure between the electric cores, and achieve the purposes of reducing cost and reducing occupied space of the connection structure.

Embodiments of the present application provide a battery pack including a cell assembly and a plurality of first conductive members. The battery cell assembly comprises a first battery cell assembly and a second battery cell assembly which are connected in parallel. The first battery cell assembly comprises a plurality of first battery cells, the plurality of first battery cells are arranged in a stacked mode along the thickness direction of the first battery cells, each first battery cell comprises a first body portion, a first positive electrode lug and a first negative electrode lug, the first positive electrode lug and the first negative electrode lug extend out of the first body portion along the length direction of the first body portion, the adjacent first battery cells are connected, and the first positive electrode lug of one first battery cell is connected with the first negative electrode lug of the other first battery cell. The second battery cell assembly comprises a plurality of second battery cells, the plurality of second battery cells are stacked along the thickness direction of the second battery cells, the second battery cells comprise a second body part, a second positive electrode lug and a second negative electrode lug, the second positive electrode lug and the second negative electrode lug extend out of the second body part along the length direction of the second body part, the second positive electrode lug of one second battery cell is connected with the second negative electrode lug of the other second battery cell between the adjacent second battery cells. The first battery cell assembly and the second battery cell assembly are arranged along the width direction of the first battery cell assembly, and the width direction of the first battery cell assembly is perpendicular to the thickness direction and the length direction of the first battery cell at the same time. The first conductive piece comprises a first welding part and a second welding part, the first welding part is welded on a first positive lug and a first negative lug which are connected with each other, and the second welding part is welded on a second positive lug and a second negative lug which are connected with each other.

In some embodiments, the first positive tab of the first cell is welded to the first negative tab of the other first cell, and the second positive tab of the second cell is welded to the second negative tab of the other second cell.

In some embodiments, the battery pack further includes a circuit board and a second conductive member, one end of the second conductive member is electrically connected to the first conductive member, and the other end of the second conductive member is electrically connected to the circuit board.

In some embodiments, the first cell assembly comprises N first cells, the second cell assembly comprises N second cells, the battery pack comprises N-1 first conductive members, and N is a natural integer.

In some embodiments, the battery pack includes N-1 of the second conductive members.

In some embodiments, the first welded portion of the first conductive member is connected in a stack with the first positive tab and the first negative tab connected to each other, and the second welded portion of the first conductive member is connected in a stack with the second positive tab and the second negative tab connected to each other.

In some embodiments, the second conductive member is soldered to the circuit board.

In some embodiments, 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 connecting the circuit board, the second connection portion connecting the first conductive member.

In some embodiments, along the width direction of the first battery cell assembly, the first battery cells and the second battery cells are arranged in a one-to-one correspondence manner, where the first negative electrode tab and the second negative electrode tab are disposed between the first positive electrode tab and the second positive electrode tab, or the first positive electrode tab and the second positive electrode tab are disposed between the first negative electrode tab and the second negative electrode tab.

In some embodiments, along the width direction of the first battery cell assembly, the first battery cells and the second battery cells are arranged in a one-to-one correspondence manner, where the first negative electrode tab and the second positive electrode tab are disposed between the first positive electrode tab and the second negative electrode tab, or the first positive electrode tab and the second negative electrode tab are disposed between the first negative electrode tab and the second positive electrode tab.

In some embodiments, the battery pack further comprises a housing, the housing comprises a first housing and a second housing, and a fixing bracket arranged between the first housing and the second housing, the first battery cell assembly is contained in the first housing, the second battery cell assembly is contained in the second housing, a first positioning groove and a second positioning groove are respectively arranged on two opposite sides of the fixing bracket, along the width direction of the first battery cell assembly, one side of the first battery cell is fixed in the first positioning groove, and one side of the second battery cell is fixed in the second positioning groove.

In some embodiments, the battery pack further includes a spacer having a plurality of spacers thereon, and the first conductive member is disposed between adjacent spacers.

In some embodiments, the battery pack further comprises a mounting plate, an opening is formed in the mounting plate, the first positive electrode lug and the first negative electrode lug penetrate through the opening and are arranged on the first surface of the mounting plate far away from the battery cell assembly, the second positive electrode lug and the second negative electrode lug penetrate through the opening and are arranged on the first surface of the mounting plate, and the first conductive piece is fixed on the first surface of the mounting plate.

In some embodiments, the battery pack includes a first housing and a mounting bracket, the battery cell assembly is accommodated in the first housing, the mounting bracket is provided with a plurality of first positioning portions and a plurality of second positioning portions near the surface of the battery cell assembly, the first positioning portions are arranged between the tabs of the adjacent first battery cells, and the second positioning portions are arranged between the tabs of the adjacent second battery cells.

In some embodiments, the first and second cells are soft-pack cells.

In some embodiments, the battery pack further includes a circuit board, and the first conductive member is soldered to the circuit board.

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

The battery pack is electrically connected between the first battery cells and the second battery cells in the battery cell assembly through the plurality of first conductive pieces, replaces the traditional conductive copper bars, simplifies the connection structure between the battery cells, and achieves the purposes of reducing the cost and the occupied space of the connection structure.

Drawings

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

Fig. 2 is a schematic perspective view of a battery cell assembly in the battery pack shown in fig. 1.

Fig. 3 is an exploded view of the cell assembly of fig. 2.

Fig. 4 is a top view of a cell assembly in the battery pack of fig. 1.

Fig. 5 is a schematic perspective view of a battery cell assembly in an embodiment.

Fig. 6 is an exploded view of the cell assembly of fig. 5.

Fig. 7 is a schematic perspective view of a battery cell assembly in an embodiment.

Fig. 8 is an exploded view of the cell assembly of fig. 7.

Fig. 9 is a schematic perspective view of a battery pack in an embodiment.

Fig. 10 is an exploded view of the battery pack of fig. 9.

Fig. 11 is a schematic perspective view of a mounting bracket in the battery pack shown in fig. 9.

Fig. 12 is a schematic perspective view of the mounting bracket of fig. 11 in another direction.

Fig. 13 is a schematic perspective view of a first case in the battery pack of fig. 9.

Fig. 14 is a schematic view of the first housing cut-out section shown in fig. 13.

Fig. 15 is a schematic view of a structure of a battery pack in an embodiment.

Description of main reference numerals:

battery pack 100

Cell assembly 10

First cell assembly 11

First cell 110

First positive electrode tab 111

First negative electrode tab 112

First body portion 113

Second cell assembly 12

Second cell 120

Second positive tab 121

Second negative electrode tab 122

Second body portion 123

First conductive member 20

First welded portion 21

Second welded portion 22

Connection portion 23

First positioning hole 24

Circuit board 30

Second conductive member 40

First connecting portion 41

Second connecting portion 42

Buffer portion 43

Housing 50

First housing 51

First accommodating chamber 511

First recess 5111

First imitation groove 5112

Second accommodating chamber 512

Second recess 5121

Second imitation groove 5122

Second housing 52

Fixing bracket 53

First positioning groove 531

Second positioning groove 532

Mounting bracket 54

First through hole 541

Second through hole 542

Limiting piece 543

First positioning piece 544

Heat sink 545

First support 546

Second support 547

First positioning portion 548

Second positioning portion 549

Spacer 60

Isolation portion 61

Mounting plate 70

Opening 71

Battery pack 200

Housing 201

Connector 202

The specific embodiment is as follows:

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments.

It will be understood that when an element is referred to as being "fixed 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 are used herein 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 application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or/and" as used herein 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 battery cell assembly and a plurality of first conductive pieces. The battery cell assembly comprises a first battery cell assembly and a second battery cell assembly which are connected in parallel. The first battery cell assembly comprises a plurality of first battery cells, the plurality of first battery cells are arranged in a stacked mode along the thickness direction of the first battery cells, each first battery cell comprises a first body portion, a first positive electrode lug and a first negative electrode lug, the first positive electrode lug and the first negative electrode lug extend out of the first body portion along the length direction of the first body portion, the adjacent first battery cells are connected, and the first positive electrode lug of one first battery cell is connected with the first negative electrode lug of the other first battery cell. The second battery cell assembly comprises a plurality of second battery cells, the plurality of second battery cells are stacked along the thickness direction of the second battery cells, the second battery cells comprise a second body part, a second positive electrode lug and a second negative electrode lug, the second positive electrode lug and the second negative electrode lug extend out of the second body part along the length direction of the second body part, the second positive electrode lug of one second battery cell is connected with the second negative electrode lug of the other second battery cell between the adjacent second battery cells. The first battery cell assembly and the second battery cell assembly are arranged along the width direction of the first battery cell assembly, and the width direction of the first battery cell assembly is perpendicular to the thickness direction and the length direction of the first battery cell at the same time. One end of the first conductive piece is welded to the first positive electrode lug and the first negative electrode lug which are connected with each other, and the other end of the first conductive piece is welded to the second positive electrode lug and the second negative electrode lug which are connected with each other.

Some embodiments of the present application are described in detail. The following embodiments and features of the embodiments may be combined with each other without collision.

Referring to fig. 1 and 2, a battery pack 100 includes a cell assembly 10, a first conductive member 20, a circuit board 30, a second conductive member 40, and a housing 50. The battery cell assembly 10 comprises a first battery cell assembly 11 and a second battery cell assembly 12 which are connected in parallel, and the first battery cell assembly 11 and the second battery cell assembly 12 are arranged along the width direction of the first battery cell assembly 11. The width direction of the first cell assembly 11 is indicated by arrow a in fig. 1. The first conductive member 20 is electrically connected to the first cell assembly 11 and the second cell 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 battery module 10 is accommodated in the housing 50.

The first cell assembly 11 includes a plurality of first cells 110, and the plurality of first cells 110 are stacked along a thickness direction of the first 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 portion 113, and the first positive tab 111 and the first negative tab 112 extend out of the first body portion 113 along the length direction of the first body portion 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 cell assembly 12 includes a plurality of second cells 120, and the plurality of second cells 120 are stacked along a thickness direction of the second cells 120, and in this embodiment, a stacking direction of the first cells 110 is the same as a stacking direction of the second cells 120. The second cell includes a second positive tab 121, a second negative tab 122, and a second body 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 the 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 embodiments of the present application, the width direction of the first battery cell assembly 11, the width direction of the second battery cell assembly 12, and the width direction of the first battery cell 110 are the same, specifically, the width direction of the first battery cell assembly 11 is perpendicular to the length direction and the thickness direction of the first battery cell 110 at the same time, and the width direction of the second battery cell assembly 12 is perpendicular to the length direction and the thickness direction of the first battery cell 110 at the same time. In fig. 1, the direction indicated by the arrow B is the length direction of the first battery cell 110, and the direction indicated by the arrow C is the thickness direction of the first battery cell 110.

With continued reference to fig. 3, 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 part 21 is welded to the first positive tab 111 and the first negative tab 112, which are connected to each other, and the second welding part 22 is welded to the second positive tab 121 and the second negative tab 122, which are connected to each other. Specifically, the first welding portion 21 is disposed between the first positive electrode tab 111 and the first negative electrode tab 112, the first welding portion 21 is welded with the first positive electrode tab 111 and the first negative electrode tab 112, or the first positive electrode tab 111 is disposed between the first welding portion 21 and the first negative electrode tab 112, the first welding portion 21 is welded with the first positive electrode tab 111, or the first negative electrode tab 112 is disposed between the first welding portion 21 and the first positive electrode tab 111, and the first welding portion 21 is welded with the first negative electrode tab 112. In this embodiment, the first negative electrode tab 112 is disposed between the first welding portion 21 and the first positive electrode tab 111, and the first welding portion 21 is welded to the first negative electrode tab 112. The second welding part 22 is disposed between the second positive electrode tab 121 and the second negative electrode tab 122, the second welding part 22 is welded with the second positive electrode tab 121 and the second negative electrode tab 122, or the second positive electrode tab 121 is disposed between the second welding part 22 and the second negative electrode tab 122, the second welding part 22 is welded with the second positive electrode tab 121, or the second negative electrode tab 122 is disposed between the second welding part 22 and the second positive electrode tab 121, and the second welding part 22 is welded with the second negative electrode tab 122. In this embodiment, the second negative electrode tab 122 is disposed between the second welding portion 22 and the second positive electrode tab 121, and the second welding portion 22 is welded to the second negative electrode tab 122.

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

The first battery cell 110 and the second battery cell 120 are connected in parallel between the first conductive members 20 to form a circuit unit, and then connected in series with an adjacent group of circuit units after being connected in parallel. In the single circuit unit, when the voltages of the first battery cell 110 and the second battery cell 120 which are connected in parallel are inconsistent, the voltages of the first battery cell 110 and the second battery cell 120 can generate circulation, the circulation direction is from the battery cell with higher voltage (the discharging direction), and the circulation direction enters the battery cell with lower voltage (the charging direction), so that the voltages of the first battery cell 110 and the second battery cell 120 are balanced, the pressure difference between the first battery cell 110 and the second battery cell 120 is reduced, the equal charge and discharge of the first battery cell 110 and the second battery cell 120 in the using process are ensured, the problem that the single battery cell cannot be fully charged or the residual electric quantity cannot be used due to the unbalanced voltage is solved, the circulation performance of the battery cell is improved, and the service life of the battery cell is prolonged. The battery pack 100 equalizes the voltages of the first battery cells 110 and the second battery cells 120 through the first conductive members 20, reduces the voltage difference between the first battery cell assembly 11 and the second battery cell assembly 12, and improves the service life of the battery cell assembly 10. In addition, according to the ohm law of the circuit science, the magnitude of the circulating current is equal to the sum of the voltage difference and the two internal resistances, so even if the voltage difference is small, because the internal resistance of the battery core is small, a larger loop current can be instantaneously formed, when the circulating current occurs, the first conductive piece 20 can also have current passing through, and the power consumption can be increased by setting the material and the size of the first conductive piece 20, so that the balancing is performed, and the impact of the instantaneous large current on the battery core 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 anodal negative pole ear direct weld of second can reduce and generate heat, reduces the constructional element.

In this embodiment, the first conductive member 20 is a copper bar, and in other embodiments, the first conductive member 20 may be a wire harness, or a copper foil disposed on the circuit board 30, etc., which is not limited to this embodiment, and can be used to realize conductive connection between the first battery cell 110 and the second battery cell 120.

Referring to fig. 3 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 part 21 of the first conductive member 20 is connected to the first positive electrode tab 111 and the first negative electrode tab 112 in a stacked manner, and the second welding part 22 of the first conductive member 20 is connected to the second positive electrode tab 121 and the second negative electrode 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. The spacer 60 is provided with a plurality of spacers 61 along the thickness direction of the first cell 110, and each first conductive member 20 is disposed between two adjacent spacers 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 welded to the circuit board 30 and the first conductive member 20, 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 means of conductive adhesive bonding or the like, which is not limited thereto. The cushioning portion 43 has elasticity, and its structure includes, but is not limited to, an "arcuate" 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 members 40 are connected to the first soldering portion 21 or the second soldering portion 22 of the first conductive member 20.

The first conductive member 20 is mainly used for balancing the voltage between the parallel cells, and the second conductive member 40 is mainly used for collecting the information of the cells. The second conductive element 40 is directly connected with the first conductive element 20, and can collect information of two adjacent cells at a time, and compared with a cell in the prior art, a collection element is needed, and the number of collection elements is reduced by the technical scheme of the application.

Referring to fig. 4, in one embodiment of the present application, along the 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, where the first negative electrode tab 112 and the second positive electrode tab 121 are disposed between the first positive electrode tab 111 and the second negative electrode tab 122, or the first positive electrode tab 111 and the second negative electrode tab 122 are disposed between the first negative electrode tab 112 and the second positive electrode tab 121, and the lengths of the plurality of first conductive members 20 connecting the first battery cell assembly 11 and the second battery cell assembly 12 are equal; alternatively, referring to fig. 7, the first positive electrode tab 111 and the second positive electrode tab 121 are disposed between the first negative electrode tab 112 and the second negative electrode tab 122, and the lengths of the first conductive members 20 connecting the first battery cell assembly 11 and the second battery cell assembly 12 are not equal.

Referring to fig. 5 and 6, in some embodiments, the battery pack 100 further includes a mounting plate 70 disposed on the top surface of the battery cell assembly 10. The mounting plate 70 is provided with a plurality of openings 71. First positive tabs 111 and first negative tabs 112 of the first plurality of cells 110 pass through the openings 71 in the mounting plate 70 and are attached to the first surface of the mounting plate 70 facing away from the cell assembly 10. The second positive tabs 121 and the second negative tabs 122 of the second plurality of cells 120 pass through the openings 71 on the mounting plate 70 and are connected to the first surface of the mounting plate 70 facing away from the cell assembly 10. The mounting plate 70 is a non-conductive member. The first conductive member 20 may be fixedly disposed on the first surface of the mounting plate 70 facing away from the battery cell assembly 10 by riveting, bonding, or the like.

Referring to fig. 7 and 8, in another embodiment, along the 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, wherein the first negative electrode tab 112 and the second negative electrode tab 122 are disposed between the first positive electrode tab 111 and the second positive electrode tab 121; alternatively, 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, so that lengths of two adjacent first conductive members 20 are unequal in order to match the arrangement positions of the first battery cell 110 and the second battery cell 120. Specifically, the nth first conductive member 20 has a length different from that of the n+1th first conductive member 20, and the nth first conductive member 20 has a length identical to that of the n+2th first conductive member 20.

Referring again to fig. 1 and 4, the housing 50 includes a first housing 51, a second housing 52 and a fixing bracket 53, and the battery module 10 is accommodated in the first housing 51 and the second housing 52. Specifically, the first battery cell assembly 11 is accommodated in the first housing 51, and the second battery cell assembly 12 is accommodated in the second housing 52. The fixing bracket 53 is used for fixing the first cell assembly 11 and the second cell assembly 12. Along the width direction of the first cell assembly 11, the first cell assembly 11 and the second cell assembly 12 are disposed on two opposite sides of the fixing bracket 53. The opposite sides of the fixed support 53 are respectively provided with a first positioning groove 531 and a second positioning groove 532, and along the width direction of the battery cell assembly 10, one side of the first battery cell 110 is accommodated in the first positioning groove 531, and one side of the second battery cell 120 is accommodated in the second positioning groove 532.

Referring to fig. 9 and 10, in another embodiment of the present application, the housing 50 includes a first housing 51 and a mounting bracket 54, the battery module 10 is accommodated in the first housing 51, and the mounting bracket 54 is disposed at an open end of the first housing 51. In one embodiment of the present application, the mounting bracket 54 is a plastic part, the first conductive member 20 and the mounting bracket 54 are fixed by embedding, 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 a surface of the mounting bracket 54. The first welding part 21 and the second welding part 22 are exposed on the surface of the mounting bracket 54, the first welding part 21 is welded to at least one of the first positive tab 111 and the first negative tab 112 connected to each other, and the second welding part 22 is welded to at least one of the second positive tab 121 and the second negative tab 122 connected to each other.

In some embodiments, the first conductive member 20 and the circuit board 30 are both disposed on an outer surface of the mounting bracket 54, and the first conductive member 20 is 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 accommodated 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 member 20 may be directly welded on the circuit board 30, and a circuit connected to the first conductive member 20 is disposed on the circuit board 30 to collect and control the battery cell assembly 10, or an opening may be formed on the circuit board 30 to facilitate the tab passing through the opening, and connection between the positive and negative tabs is implemented on the outer surface of the circuit board 30 to connect adjacent battery cells in series.

With continued reference to fig. 11, the mounting bracket 54 is provided with a plurality of first through holes 541 and a plurality of second through holes 542, and the first positive electrode tab 111 and the first negative electrode tab 112 of the adjacent first battery cell 110 respectively extend from the adjacent two first through holes 541 and are connected to the outer surface of the mounting bracket 54, and the second positive electrode tab 121 and the second negative electrode tab 122 of the adjacent second battery cell 120 respectively extend from the adjacent two second through holes 542 and are connected to the outer surface of the mounting bracket 54. Along the stacking direction of the first battery cell 110, a heat dissipation opening 545 is further disposed between the adjacent first through hole 541 and the adjacent second through hole 542, and is configured to exhaust heat generated in the charging and discharging process of the battery cell assembly 10.

The mounting bracket 54 is used for fixing and supporting the tab of the cell 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 hot melt 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 tabs of the first and second battery cells 110 and 120 respectively pass through the first and second through holes 541 and 542, and the outer surface of the mounting bracket 54 is favorable for providing support for the mounting and fixing of the tabs, so that the welding operation of the tabs is facilitated. The circuit board 30 is fixedly arranged on the mounting bracket 54, so that the second conductive member 40 and the circuit board 30 are conveniently welded and fixed.

The outer surface of the mounting bracket 54 is further provided with a plurality of limiting members 543 and first positioning members 544 for fixing the mounting positions of the first conductive members 20, so as to prevent the adjacent first conductive members 20 from contacting each other to cause a short circuit problem. Along the stacking direction of the first electrical cores 110, each first conductive member 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 hole 24 is matched with the first positioning member 544. In this embodiment, the first positioning member 544 is disposed between adjacent stopper members 543, and in other embodiments, the first positioning member 544 is disposed at other portions of the mounting bracket 54, and the first conductive member 20 may be fixed to the mounting bracket 54 by performing a heat-melting process on the first positioning member 544. Referring again to fig. 11, in some embodiments, the mounting bracket 54 further includes a first support 546 and a second support 547. The first supporting member 546 is configured to support the first positive tab 111 of the outermost first cell 110, and the second supporting member 547 is configured to support the second negative tab 122 of the outermost second cell 120, so as to connect the total positive output terminal and the total negative output terminal of the battery pack 100.

Referring to fig. 12, in some embodiments, the inner surface of the mounting bracket 54 further includes a first positioning portion 548 and a second positioning portion 549, wherein 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 110, and the second positioning portion 549 is disposed between the tabs of the adjacent second cells 120, so as to reduce the internal short circuit problem of the cell assembly 10.

Referring to fig. 13, in some embodiments, a plurality of first accommodating cavities 511 and a plurality of second accommodating cavities 512 are provided in the first housing 51. At least one first battery cell 110 is disposed in each first housing cavity 511, and at least one second battery cell 120 is disposed in each second housing cavity 512. The sidewall of the first accommodating cavity 511 is provided with a first profiling groove 5112, and the sidewall of the second accommodating cavity 512 is provided with a second profiling groove 5122. The side of the first battery cell 110 is received in the first profiling groove 5112, and the side of the second battery cell 120 is received in the second profiling groove 5122.

Referring to fig. 14, in some embodiments, a first recess 5111 is formed at the bottom of the first accommodating cavity 511, and a second recess 5121 is formed at the bottom of the second accommodating cavity 512. The first recess 5111 and the second recess 5121 are used for accommodating glue to fix the first cell 110 and the second cell 120.

Referring to fig. 15, an embodiment of the present application further provides a battery pack 200, including a housing 201 and the battery pack 100 in any of the above embodiments or combinations of embodiments. The battery pack 100 is accommodated in the case 201. The surface of the housing 201 is further 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 in the above embodiment, where the battery pack 100 or the battery pack 200 is provided in the body. Further, the power utilization device may be an electric vehicle, an electric bus, an electric automobile, an energy storage device, an electric bicycle, a flying device, etc., and accordingly, the body is a vehicle body structure, and the battery pack 100 or the battery pack 200 is disposed in the vehicle body to supply power.

It will be appreciated that in other embodiments, the powered device may also be a hand-held, electrically powered device, such as a vacuum cleaner, a weeder, or the like.

The above embodiments are only for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.

Claims

A battery pack, comprising:

the battery cell assembly comprises a first battery cell assembly and a second battery cell assembly which are connected in parallel;

the first battery cell assembly comprises a plurality of first battery cells, the plurality of first battery cells are stacked along the thickness direction of the first battery cells, the first battery cells comprise a first body part, a first positive electrode lug and a first negative electrode lug, the first positive electrode lug and the first negative electrode lug extend out of the first body part along the length direction of the first body part, and the first positive electrode lug of one first battery cell is connected with the first negative electrode lug of the other first battery cell between the adjacent first battery cells;

the second battery cell assembly comprises a plurality of second battery cells, the plurality of second battery cells are stacked along the thickness direction of the second battery cells, the second battery cells comprise a second body part, a second positive electrode lug and a second negative electrode lug, the second positive electrode lug and the second negative electrode lug extend out of the second body part along the length direction of the second body part, and the second positive electrode lug of one second battery cell is connected with the second negative electrode lug of the other second battery cell between the adjacent second battery cells;

the battery pack is characterized in that the first battery cell assembly and the second battery cell assembly are arranged along the width direction of the first battery cell assembly, the width direction of the first battery cell assembly is perpendicular to the thickness direction and the length direction of the first battery cell at the same time, the battery pack further comprises a plurality of first conductive pieces, each first conductive piece comprises a first welding part and a second welding part, the first welding parts are welded on a first positive electrode lug and a first negative electrode lug which are connected with each other, and the second welding parts are welded on a second positive electrode lug and a second negative electrode lug which are connected with each other.
The battery of claim 1, wherein the first positive tab of the first cell is welded to the first negative tab of the other first cell and the second positive tab of the second cell is welded to the second negative tab of the other second cell.
The battery pack of claim 1, further comprising a circuit board and a second conductive member, wherein one end of the second conductive member is electrically connected to the first conductive member, and the other end of the second conductive member is electrically connected to the circuit board.
The battery pack of claim 3, wherein the first cell assembly comprises N of the first cells, the second cell assembly comprises N of the second cells, the battery pack comprises N-1 of the first conductive members, and N is a natural integer.
The battery of claim 4, wherein said battery comprises N-1 of said second conductive members.
The battery of any one of claims 3-5, wherein a first welded portion of the first conductive member is in stacked connection with the first positive tab and the first negative tab, and a second welded portion of the first conductive member is in stacked connection with the second positive tab and the second negative tab.
The battery of claim 6, wherein the second conductive member is soldered to the circuit board.
The battery of claim 6, 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 connecting the circuit board, the second connection portion connecting the first conductive member.
The battery pack according to claim 6, wherein the first cells and the second cells are arranged in a one-to-one correspondence along a width direction of the first cells, wherein the first negative electrode tab and the second negative electrode tab are disposed between the first positive electrode tab and the second positive electrode tab, or wherein the first positive electrode tab and the second positive electrode tab are disposed between the first negative electrode tab and the second negative electrode tab.
The battery pack according to claim 6, wherein the first cells and the second cells are arranged in a one-to-one correspondence along a width direction of the first cells, wherein the first negative electrode tab and the second positive electrode tab are disposed between the first positive electrode tab and the second negative electrode tab, or wherein the first positive electrode tab and the second negative electrode tab are disposed between the first negative electrode tab and the second positive electrode tab.
The battery pack according to claim 1, further comprising a housing, wherein the housing comprises a first housing, a second housing, and a fixing bracket provided between the first housing and the second housing, the first cell assembly is accommodated in the first housing, the second cell assembly is accommodated in the second housing, a first positioning groove and a second positioning groove are respectively provided on opposite sides of the fixing bracket, and along a width direction of the first cell assembly, one side of the first cell is fixed to the first positioning groove, and one side of the second cell is fixed to the second positioning groove.
The battery of claim 1, further comprising a spacer having a plurality of spacers disposed thereon, wherein the first conductive member is disposed between adjacent spacers.
The battery pack of claim 1, further comprising a mounting plate, wherein the mounting plate is provided with an opening, the first positive tab and the first negative tab pass through the opening and are disposed on a first surface of the mounting plate away from the cell assembly, the second positive tab and the second negative tab pass through the opening and are disposed on the first surface of the mounting plate, and the first conductive member is fixed on the first surface of the mounting plate.
The battery pack of claim 1, wherein the battery pack comprises a first housing and a mounting bracket, the cell assembly is accommodated in the first housing, a plurality of first positioning portions and a plurality of second positioning portions are arranged on the surface, close to the cell assembly, of the mounting bracket, the first positioning portions are arranged between lugs of adjacent first cells, and the second positioning portions are arranged between lugs of adjacent second cells.
The battery pack of claim 1, wherein the first cell and the second cell are soft-pack cells.
The battery of claim 15, further comprising a circuit board, wherein the first conductive member is soldered to the circuit board.
An electrical device comprising a battery as claimed in any one of claims 1 to 16.