CN113097627B

CN113097627B - Battery pack

Info

Publication number: CN113097627B
Application number: CN202110347987.4A
Authority: CN
Inventors: 吴佳凡; 邓嘉东; 张志国
Original assignee: Zhuhai Cosmx Power Battery Co Ltd
Current assignee: Zhuhai Cosmx Power Battery Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2023-05-19
Anticipated expiration: 2041-03-31
Also published as: CN113097627A

Abstract

The invention provides a battery pack, and relates to the technical field of batteries. The solar cell module comprises a shell, N cell modules and a busbar, wherein a first ventilation opening and a second ventilation opening are formed in the shell, and a heat dissipation air channel is formed between the first ventilation opening and the second ventilation opening; the N battery cells are arranged in the shell, gaps among the N battery cells form at least part of heat dissipation air channels, and the battery cell lugs are all positioned in the heat dissipation air channels; each cell module comprises a plurality of cell assemblies, and each cell assembly comprises a cell unit, a positive electrode end and a negative electrode end; the busbar comprises a main body and a plurality of conductive pieces, wherein the plurality of conductive pieces are arranged side by side on the main body, a plurality of extending parts are formed at the first side edge of the main body in an extending mode, a first avoidance bit is formed between any two adjacent extending parts, and at least one of a positive electrode end and a negative electrode end is electrically connected with the extending parts. The battery pack can solve the problems of high modularized production cost and lower heat dissipation performance of the existing battery pack.

Description

Battery pack

Technical Field

The invention relates to the technical field of batteries, in particular to a battery pack.

Background

The battery pack is usually a pack body (pack) formed by combining a plurality of battery cells and a battery management system circuit, in practice, the surface of the soft pack battery is softer, and the size and shape of the soft pack battery are unstable, so that when the battery pack is designed, larger uncertainty exists, and the difficulty of modularized generation of the battery pack is increased. In addition, due to the characteristics of the battery pack cell stack and the limitation of space, the scheme for heat dissipation of the battery pack has been limited, and a heat dissipation aluminum sheet is generally used for directly conducting heat of the cell body to the outside. This results in a battery that is not able to simultaneously sufficiently dissipate heat from the battery cell tab, the battery cell body, and the battery management system when operated at high rates. Therefore, in the prior art, the modularized production cost of the battery pack is high, and the heat dissipation performance is low.

Disclosure of Invention

The embodiment of the invention provides a battery pack, which aims to solve the problems of high modularized production cost and lower heat dissipation performance of the traditional battery pack.

The embodiment of the invention provides a battery pack, which comprises: a shell, N cell modules and a busbar,

a first ventilation opening and a second ventilation opening are formed in the shell, and a heat dissipation air channel is formed between the first ventilation opening and the second ventilation opening; the N battery cell modules are arranged in the shell, gaps among the N battery cell modules form at least part of the heat dissipation air duct, battery cell lugs of the N battery cell modules are all positioned in the heat dissipation air duct, and N is an integer larger than 1;

each cell module comprises a plurality of cell assemblies, and each cell assembly comprises a cell unit, a positive electrode end and a negative electrode end;

the busbar comprises a main body and a plurality of conductive pieces, wherein the conductive pieces are arranged side by side on the main body, a plurality of extending parts are formed at the first side edge of the main body in an extending mode, a first avoidance position is formed between any two adjacent extending parts, the first avoidance position is used for accommodating at least one of the positive electrode end and the negative electrode end, and at least one of the positive electrode end and the negative electrode end is electrically connected with the extending parts.

Optionally, the heat dissipation air duct includes a first air duct and a second air duct, one end of the first air duct is communicated with the first ventilation opening, and one end of the second air duct is communicated with the second ventilation opening; and the battery cell lugs of the N battery cell modules are all positioned in the first air duct.

Optionally, the first air channel is perpendicular to the second air channel, and one end of the first air channel away from the first ventilation opening is connected with the second air channel.

Optionally, the first ventilation opening is disposed at the bottom or the top of the housing, and the first air duct extends from the bottom of the housing to the top of the housing.

Optionally, the plurality of extension portions are arranged side by side along a first direction, the plurality of battery cell assemblies are arranged in a stacked manner along the first direction, and the first direction is perpendicular to the heat dissipation air duct.

Optionally, the main part is formed by a plurality of connecting plates being connected side by side, and two adjacent connecting plates can be dismantled fixedly between, a plurality of electrically conductive piece one-to-one set up in on the plurality of connecting plates.

Optionally, the first end of the connecting plate is bent to form a bending part, the bending part includes the first side edge, the plurality of extending parts are arranged side by side along a first direction, the plurality of connecting pieces are detachably fixed along a second direction, the second direction is perpendicular to the first direction, and/or the second direction is perpendicular to the heat dissipation air duct.

Optionally, the positive electrode terminal comprises a tab lead and a first electrode piece, and the negative electrode terminal comprises a tab lead and a second electrode piece;

the first electrode plate and the second electrode plate are arranged at intervals in a back-to-back mode, or the first electrode plate and the second electrode plate are arranged at intervals in a side-to-side mode.

Optionally, the first electrode plate and the second electrode plate are both located in the heat dissipation air duct.

Optionally, the cell assembly further comprises a support frame, wherein the support frame is used for fixing the cell units, and the support frames of the cell assemblies are connected in a stacked manner;

the support frame includes a second avoidance bit for receiving the positive end and the negative end.

The embodiment of the invention provides a battery pack, wherein a first ventilation opening and a second ventilation opening are arranged, a heat dissipation air channel is formed between the first ventilation opening and the second ventilation opening, at least part of the heat dissipation air channel is formed by gaps among N electric cores in the battery pack, and electric core lugs of N electric core modules are all positioned in the heat dissipation air channel, so that heat dissipation of the electric cores and the electric core lugs can be realized through the heat dissipation air channel formed by the gaps among the N electric core modules, and the heat dissipation performance of the battery pack is improved. In addition, through setting up the positive pole end and the negative pole end that the busbar connects a plurality of electric core module, need not to use the model instrument, not only reduced electric core module's the cost of production, still make electric core module's equipment more simple and convenient, improved electric core module's the efficiency of production.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a battery pack according to an embodiment of the present invention;

fig. 2 is an exploded view of a battery pack according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a battery pack according to an embodiment of the invention;

FIG. 4 is a schematic diagram of a bus bar according to an embodiment of the present invention;

FIG. 5 is a third schematic diagram of a battery pack according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a battery cell assembly according to an embodiment of the present invention;

FIG. 7 is a second schematic diagram of a battery cell assembly according to an embodiment of the present invention;

fig. 8 is an exploded view of a battery cell assembly according to an embodiment of the present invention.

Reference numerals:

100. a cell assembly; 101. a first cell; 1011. a first positive tab; 1012. a first negative electrode tab; 102. a second cell; 1021. a second positive tab; 1022. a second negative electrode tab; 110. a first electrode sheet; 120. a second electrode sheet; 130. a support frame; 140. a signal acquisition unit; 150. a cell unit; 160. a buffer member; 200. a busbar; 210. a conductive member; 220. a first avoidance bit; 300. an end plate; 400. a signal acquisition module; 500. a housing; 501. a first vent; 502. a second vent; 503. a lower housing; 504. an end cap; 505. a filtering device; 506. a sealing device; 600. a cell module; 6021. a battery cell tab; 700. a heat dissipation plate; 800. a BMS circuit; 900. and (5) cooling the plate.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.

Referring to fig. 1 to 8, an embodiment of the present invention provides a battery pack including: a housing 500, N cell modules 600, and a buss bar 200,

the shell 500 is provided with a first ventilation opening 501 and a second ventilation opening 502, and a heat dissipation air channel is formed between the first ventilation opening 501 and the second ventilation opening 502; n cell modules 600 are arranged in the shell 500, gaps among the N cell modules 600 form at least partial heat dissipation air channels, cell lugs 6021 of the N cell modules 600 are all positioned in the heat dissipation air channels, and N is an integer larger than 1;

each cell module 600 includes a plurality of cell assemblies 100, each cell assembly 100 including a cell unit 150, a positive terminal, and a negative terminal;

the busbar 200 includes a main body and a plurality of conductive members 210, wherein the plurality of conductive members 210 are disposed side by side on the main body, and a plurality of extension portions are formed at a first side of the main body in an extending manner, a first avoidance bit 220 is formed between any two adjacent extension portions, the first avoidance bit 220 is used for accommodating at least one of a positive electrode terminal and a negative electrode terminal, and at least one of the positive electrode terminal and the negative electrode terminal is electrically connected with the extension portion.

In this embodiment, when the N cell modules 600 are disposed in the housing 500, the N cell modules 600 may be disposed in pairs, and at least a portion of the heat dissipation air channel is formed by the gap between the cell modules 600 disposed in pairs, and in the case where N is greater than 2, if the cell modules 600 disposed in pairs are regarded as a cell combination, the cell combinations may be disposed in a stacked manner, so as to reduce the space occupation of the cell modules 600, and in particular, refer to fig. 1.

In order to realize the heat dissipation function of the battery pack, the battery pack may be provided with a first ventilation opening 501 and a second ventilation opening 502, and a heat dissipation air channel is formed between the first ventilation opening 501 and the second ventilation opening 502. It should be understood that the heat dissipation air duct may be formed by enclosing the outer contours of the housing 500 and the N battery modules 600, etc., so that no additional molded ventilation channels are required, and the space of the battery pack is occupied. In the battery charging process, the first ventilation opening 501 may be externally connected with a fan, and the cooling air is transmitted from the first ventilation opening 501 to the second ventilation opening 502 through the cooling air channel, so that the heat dissipation of each battery module 600 in the battery pack may be accelerated.

For the N cell modules 600, in order to achieve heat dissipation to the cell tabs 6021, the cell modules 600 in the N cell modules 600 may be disposed in pairs, and the opposite sides of the cell modules 600 are provided with tabs, so that a space between two cell modules 600 disposed in pairs may form at least part of the heat dissipation air channel, and simultaneously dissipate heat for the tabs of two cell modules 600.

In this embodiment, the positive and negative terminals can be understood as output electrodes of the cell assembly 100, which are finally output based on the serial-parallel relationship of the internal cells of the cell assembly 100, and can also be referred to as tabs of the cell assembly 100. The positive electrode is the output positive electrode of the battery cell assembly 100, and the negative electrode is the output negative electrode of the battery cell assembly 100.

The bus bar 200 is designed as shown in fig. 4, and the extending portions of the conductive members 210 are distributed on the first side of the main body of the bus bar 200 in a tooth shape, so that a first avoidance space is formed between any two adjacent extending portions, and the first avoidance space can accommodate at least one of the positive terminal and the negative terminal, so as to facilitate the electrical connection between the at least one of the positive terminal and the negative terminal and the extending portion.

It should be noted that the serial-parallel relationship between the plurality of battery modules 100 may be adjusted by the bus bar 200, and may be specifically determined according to practical situations, which is not limited herein.

The battery pack, through setting up first vent 501 and second vent 502, form the heat dissipation wind channel between first vent 501 and the second vent 502, the clearance formation between N electric core in the battery pack is formed by the clearance in the heat dissipation wind channel at least partially, and the electric core utmost point ear 6021 of N electric core module 600 all is located the heat dissipation wind channel to can realize the heat dissipation to electric core and electric core utmost point ear 6021 simultaneously through the heat dissipation wind channel that the clearance formed between N electric core module 600, promoted the heat dispersion of battery pack. In addition, the bus bar 200 is arranged to connect the positive electrode ends and the negative electrode ends of the plurality of battery cell modules 600, so that a model tool is not required, the production cost of the battery cell modules 600 is reduced, the assembly of the battery cell modules 600 is simpler and more convenient, and the production efficiency of the battery cell modules 600 is improved.

Optionally, the heat dissipation air duct includes a first air duct and a second air duct, one end of the first air duct is communicated with the first ventilation opening 501, and one end of the second air duct is communicated with the second ventilation opening 502; the cell tabs 6021 of the N cell modules 600 are all located in the first air channel.

In the embodiment of the present invention, since the housing 500 is generally formed in a rectangular parallelepiped shape, the ventilation opening is generally required to be formed at a side surface or a bottom surface of the housing 500 in consideration of sealability, waterproofness, and the like. Suitably, the heat dissipation air duct may include a first air duct and a second air duct, so as to facilitate communication between the first air vent 501 and the second air vent 502.

Meanwhile, the N cell modules 600 may be disposed in pairs, and gaps between every two cell modules 600 disposed in opposition form at least part of the first air channel, and opposite sides of each two cell modules 600 disposed in opposition are provided with cell tabs 6021, so that the cell tabs 6021 are located in the first air channel.

Further, referring to fig. 3, the first air channel is an air channel vertically arranged in fig. 3, the second air channel is an air channel horizontally arranged in fig. 3, the first air channel and the second air channel can be arranged in an adaptive manner to the N blocks of battery modules 600, the first air channel and the second air channel are mutually perpendicular, and one end of the first air channel away from the first ventilation opening 501 can be communicated with the second air channel, so that a heat dissipation air channel arranged in a T shape is formed, and the space utilization rate of the battery pack is improved.

Further, the first ventilation opening 501 may be disposed at the bottom or the top of the housing 500, and the first air duct may extend from the bottom of the housing 500 to the top of the housing 500.

In the embodiment of the present invention, the first air duct is disposed between the bottom and the top of the housing 500, so that the space between the battery cells 600 can be fully utilized to dissipate heat to the tabs, and the space utilization efficiency of the battery pack can be improved.

Optionally, to facilitate heat dissipation of the body of the cell module 600, the battery pack further includes at least one heat dissipation plate 700, where each heat dissipation plate 700 is partially located at a gap between two oppositely disposed cell modules 600, and is respectively bonded and fixed with the two oppositely disposed cell modules 600.

In other words, the heat dissipation plate 700 may cover at least a portion of the gap while being bonded and fixed to the two opposing cell modules 600.

The heat on the two opposite cell modules 600 can be conducted through one heat dissipation plate 700 at the same time, and then can be cooled by the cooling air of the heat dissipation air duct. The material of the heat dissipation plate 700 may be set according to actual needs. In some embodiments, the heat dissipation plate 700 may be made of an insulating material with better thermal conductivity. In some embodiments, the heat dissipation plate 700 may be made of a conductive material such as graphite or metal after surface insulation treatment.

In one possible embodiment, the battery pack further includes a battery management system (Battery Management System, BMS) circuit electrically connected to the N battery cells 600 and a cooling plate 900 fixedly connected to the battery management system circuit and the housing 500, respectively, and gaps between the cooling plate 900 and the N battery cells 600 form at least a portion of a second air duct.

In the embodiment of the present invention, the BMS circuit 800 can intelligently manage and maintain the N battery cells 600, prevent the battery from being overcharged and overdischarged, prolong the service life of the battery, and monitor the state of the battery. Generally, the BMS circuit 800 may be provided on a printed circuit board (Printed Circuit Board, PCB) and fixedly connected to the housing 500 by means of adhesion or clamping.

In order to realize the heat dissipation of the BMS circuit 800, the BMS circuit 800 may be fixedly connected with the cooling plate 900, specifically, the BMS circuit 800 may be disposed on one side of a PCB, and the other side of the PCB may be attached to the cooling plate 900, so that the heat of the PCB may be conducted to the cooling plate 900, thereby realizing the heat dissipation of the BMS circuit 800.

Further, the cooling plate 900 may form at least part of the second air duct with the N electrical cells, so that cooling of the cooling plate 900 may be accelerated by cooling air of the cooling air duct. Referring to fig. 3, gaps exist between the cooling plate 900 and the N electrical cores, so that at least a part of the second air channel is formed by the gaps, and cooling air can pass through the gaps to dissipate heat from the cooling plate 900.

The connection between the cooling plate 900 and the BMS circuit 800 may be set according to actual needs. In some embodiments, the cooling plate 900 may be made of an insulating material so as to be directly bonded to a circuit board carrying the BMS circuit 800. In some embodiments, the cooling plate 900 may be made of a metal material, so that the cooling plate 900 and the BMS circuit 800 may be bonded by an insulating layer, which is not further limited herein.

In one possible embodiment, housing 500 includes a lower housing 503 housing 500 and an end cap 504, with battery management system circuitry located between end cap 504 and cooling plate 900 and secured in place with end cap 504 and cooling plate 900, respectively.

In an embodiment of the present invention, for easy disassembly, the housing 500 may be composed of a lower housing 503, a housing 500 and an end cover 504, and referring to fig. 1, the BMS circuit 800 may be disposed on a PCB board and attached and fixed to the end cover 504 and the cooling plate 900 through the PCB board. Of course, in other alternative embodiments, the housing 500 may be formed by a side plate and two end caps 504, etc., and may be specifically configured according to actual needs.

Further, in order to ensure the tightness of the battery pack, external solids or liquids are prevented from entering the battery pack, so that the safety of the battery pack is improved, the connection between the cooling plate 900 and the battery management system circuit may be sealed, and the connection between the cooling plate 900 and the lower housing 503 and the housing 500 may be sealed.

Specifically, the sealing process may be performed by providing a sealing ring on the cooling plate 900, or by connecting the cooling plate 900 and the housing 500 with a sealing compound, and the like, which is not further limited herein.

Optionally, the first ventilation opening 501 is disposed at the bottom or top of the housing 500, and/or the second ventilation opening 502 is disposed at one side of the housing 500 and is located near the connection between the cooling plate 900 and the housing 500.

In an embodiment of the present invention, the first ventilation opening 501 may be disposed at the bottom or the top of the housing 500 in order to fully utilize the space in the battery pack. In order that cooling air may pass through the cooling plate 900 provided at the end cover 504, the second ventilation opening 502 may be provided near a connection point of the cooling plate 900 and the case 500. In practical use, the first ventilation opening 501 may be an air inlet, connected to a fan, and the second ventilation opening 502 may be an air outlet.

Referring to fig. 3, the arrow in fig. 3 indicates a possible flow direction of cooling air, and the cooling air enters from the first ventilation opening 501, passes through a part of the heat dissipation air channels formed by the gaps between the N battery cells 600, then passes through a part of the heat dissipation air channels formed by the cooling plate 900 and the N battery cells, and finally flows out from the second ventilation opening 502.

Alternatively, the plurality of extensions are arranged side by side along the first direction, and the plurality of cell assemblies 100 are arranged in a stacked manner along the first direction.

The first direction is understood as the A-A direction as shown in fig. 4 and 5.

In this embodiment, the side-by-side direction of the plurality of extending portions of the bus bar 200 is the same as the stacking direction of the battery cell assembly 100, when the bus bar 200 is assembled to the battery pack, the extending portions can be placed along the B-B direction, and the conductive members 210 of the bus bar 200 are closely spaced from and staggered with the positive and negative terminals of the battery cell assembly 100, so that the fixing between the conductive members 210 and the positive and negative terminals is more convenient.

In one possible embodiment, the main body is formed by connecting a plurality of connecting plates side by side, two adjacent connecting plates are detachably fixed, and the plurality of conductive elements 210 are disposed on the plurality of connecting plates in a one-to-one correspondence.

In this embodiment, the busbar 200 is formed by splicing a plurality of connection plates side by side, the number of the connection plates can be determined according to the number of the cell assemblies 100 in the cell module 600, and one connection plate is provided with one conductive member 210. When the battery module needs to be additionally installed or detached from the battery cell assembly 100, the bus bar 200 can be correspondingly additionally installed or detached from the connecting plate, so that the bus bar 200 can be more flexibly detached and assembled, and the requirements of different numbers of battery cell assemblies 100 can be met.

In one implementation form, as shown in fig. 4, the first end of the connecting plate is bent to form a bending portion, the bending portion includes a first side edge, the plurality of extending portions are arranged side by side along a first direction, the plurality of connecting pieces are detachably fixed along a second direction, and the second direction is perpendicular to the first direction.

In this embodiment, the first direction is perpendicular to the heat dissipation air duct and the second direction is perpendicular to the heat dissipation air duct.

Wherein the second direction may be understood as the B-B direction as shown in fig. 4.

In this implementation manner, the first end of the connecting plate is bent to form a bending portion, so that the bending portion of the connecting portion forms a certain angle with other portions except for the bending portion, the bending portion extends along the B-B direction, and the other portions except for the bending portion extend along the A-A direction, so that the busbar 200 finally gathers at two end faces of the battery cell module 600, and adjustment of the serial-parallel relationship between the battery cell assemblies 100 is more conveniently completed.

In one possible embodiment, the cell assembly 100 includes a first sub-side, the positive and negative terminals being located on the first sub-side, the cell module 600 including the first side, the first side including the first sub-side.

In this embodiment, as shown in fig. 5, the output electrodes of each cell assembly 100 may be located on a uniform side of the battery module and arranged in a more regular manner. Such an arrangement can correspond to the arrangement of the conductive members 210 of the bus bar 200, more facilitate the installation of the bus bar 200, and more facilitate the fixation of the positive and negative terminals to the conductive members 210.

Alternatively, as shown in fig. 6, the positive electrode terminal includes a tab lead and a first electrode tab 110, and the negative electrode terminal includes a tab lead and a second electrode tab 120;

the first electrode sheet 110 and the second electrode sheet 120 are disposed at a back-to-back interval, or the first electrode sheet 110 and the second electrode sheet 120 are disposed at a side-by-side interval.

In the present embodiment, the first electrode tab 110 is connected to the tab lead to form the positive electrode terminal, and the second electrode tab 120 is connected to the tab lead to form the negative electrode terminal. The first electrode tab 110 and the second electrode tab 120 may be directly welded in contact with the extension portion to realize electrical connection between the bus bar 200 and the positive and negative electrode terminals, thereby further improving the convenience of mounting the bus bar 200.

In a specific implementation, as shown in fig. 6, the first electrode plate 110 and the second electrode plate 120 are arranged at intervals side by side, so as to reduce mutual interference between the first electrode plate 110 and the second electrode plate 120 and reduce the short circuit risk of the battery cell assembly 100.

In another implementation, as shown in fig. 7, the first electrode tab 110 and the second electrode tab 120 are disposed at a distance opposite to each other, so as to reduce the positions of the electrode tabs disposed on the cell assembly 100, and simplify the structure of the cell assembly 100. It will be appreciated that the sizes and structures of the first electrode pad 110 and the second electrode pad 120 may be determined according to the specific situation, and embodiments of the present invention are not limited herein.

In one implementation, the first electrode piece 110 and the second electrode piece 120 are both located in the heat dissipation air duct, so that heat dissipation processing can be performed on the first electrode piece 110 and the second electrode piece 120 quickly.

Optionally, as shown in fig. 6, the cell assembly 100 further includes a support frame 130, where the support frame 130 is used to fix the cell units 150, and the support frames 130 of the multiple cell assemblies 100 are stacked and connected;

the support frame 130 includes a second relief position for receiving the positive and negative terminals.

In this embodiment, the material of the supporting frame 130 is an insulating material, and through the setting of the supporting frame 130, the battery cell unit 150 can be supported and the position of the battery cell in the battery cell unit 150 can be fixed, so that a gap exists between adjacent battery cells, and a short circuit condition is avoided. In addition, the support frame 130 is provided with a second avoidance bit, which can enable the positive electrode end and the negative electrode end to extend out of the support frame 130, so as to facilitate connection between the positive electrode end and the negative electrode end and the conductive member 210 of the busbar 200.

In particular, the fixed connection manner between the battery cell unit 150 and the support frame 130 may be specifically determined according to the structure of the support frame 130 and the number and arrangement manner of the battery cells in the battery cell unit 150. For example, the supporting frame 130 may be a frame body with a hollowed-out middle, and the battery cell unit 150 may be clamped in the supporting frame 130; alternatively, the support frame 130 may be a non-hollow frame, and the battery cell 150 may be bonded to the support frame 130.

In one implementation, the support frame 130 is provided with one of a buckle or a slot, and the first side is provided with the other of a buckle or a slot, through which the busbar 200 and the cell module 600 are fixedly connected.

In one implementation, as shown in fig. 2, the battery pack further includes two end plates 300, and the battery pack further includes a second side surface and a third side surface opposite to each other, each of the second side surface and the third side surface being adjacent to the first side surface and perpendicular to the stacking direction of the support frames 130, one of the two end plates 300 being disposed on the second side surface, and the other of the two end plates 300 being disposed on the third side surface. The end plates 300 may protect the exposed battery cells 150 on both end surfaces.

Optionally, as shown in fig. 6, the cell unit 150 includes a plurality of cells, where the plurality of cells form the positive electrode terminal and the negative electrode terminal after being connected in series or in parallel;

the plurality of electric cores comprise a first electric core 101 and a second electric core 102 which are adjacent to each other, a first positive electrode lug 1011 and a first negative electrode lug 1012 are arranged on a second sub-side surface of the first electric core 101, and a second positive electrode lug 1021 and a second negative electrode lug 1022 are arranged on a third sub-side surface of the second electric core 102;

at least one of the first positive electrode tab 1011 and the first negative electrode tab 1012 is welded and fixed with at least one of the second positive electrode tab 1021 and the second negative electrode tab 1022, and the first battery cell 101 and the second battery cell 102 are connected in series or in parallel through the first positive electrode tab 1011, the first negative electrode tab 1012, the second positive electrode tab 1021 and the second negative electrode tab 1022.

It should be noted that, in fig. 6, only one positional relationship between the first battery cell 101 and the second battery cell 102 in the specific embodiment is illustrated, and a specific implementation form of the positional relationship between the first battery cell 101 and the second battery cell 102 may be determined according to actual situations, which is not limited herein.

In this embodiment, the first cell 101 includes a first tab pair, which is a first positive tab 1011 and a first negative tab 1012, respectively, and the second cell 102 includes a second tab pair, which is a second positive tab 1021 and a second negative tab 1022, respectively. Any adjacent first cell 101 and second cell 102 are connected in series or in parallel through the first positive tab 1011, the first negative tab 1012, the second positive tab 1021 and the second negative tab 1022, so that a plurality of cells form a whole through series connection and/or parallel connection. The connection relationship between the first battery cell 101 and the second battery cell 102 may include at least five of the following cases:

in the first case, the first positive electrode tab 1011 and the second positive electrode tab 1021 are welded and fixed, and the first negative electrode tab 1012 and the second negative electrode tab 1022 are not welded and fixed. In this case, the first cell 101 and the second cell 102 are connected in parallel.

In the second case, the first positive electrode tab 1011 and the second negative electrode tab 1022 are welded and fixed, and the first negative electrode tab 1012 and the second positive electrode tab 1021 are not welded and fixed. In this case, the first cell 101 and the second cell 102 are connected in series.

In the third case, the first negative electrode tab 1012 and the second negative electrode tab 1022 are welded and fixed, and the first positive electrode tab 1011 and the second positive electrode tab 1021 are not welded and fixed. In this case, the first cell 101 and the second cell 102 are connected in parallel.

In the fourth case, the first negative electrode tab 1012 is welded to the second positive electrode tab 1021, and the first positive electrode tab 1011 is not welded to the second negative electrode tab 1022. In this case, the first cell 101 and the second cell 102 are connected in series.

In the fifth case, the first positive electrode tab 1011 and the second positive electrode tab 1021 are welded and fixed, and the first negative electrode tab 1012 and the second negative electrode tab 1022 are welded and fixed. In this case, the first cell 101 and the second cell 102 are connected in parallel.

In this embodiment, based on the adjacent arrangement of the first electrical core 101 and the second electrical core 102, when the plurality of electrical cores are in a series connection or parallel connection, only the tab pairs of the adjacent electrical cores need to be welded and fixed, and the busbar 200 is not needed in the welding process, so that the probability of short circuit of the electrical core assembly 100 is further reduced, and meanwhile, the manufacturing cost of the electrical core assembly 100 is reduced.

In the present embodiment, the positive electrode may be formed by connecting the positive electrode tabs of any one of the cells in series, or may be formed by connecting the positive electrode tabs of a plurality of the cells in parallel.

In the first case, the positive electrode terminal is formed by connecting the positive electrode tabs of any one of the battery cells in series, and the positive electrode tab is electrically connected with the first electrode slice 110, where the positive electrode tab is electrically connected with the first electrode slice 110, which can be understood as that the positive electrode tab is welded and fixed with the first electrode slice 110.

In the second case, the positive electrode terminal is formed by connecting the positive electrode tabs of the plurality of battery cells in parallel. The positive electrode end is formed by connecting positive electrode lugs of a plurality of battery cells in parallel, namely, the positive electrode lugs of the adjacent battery cells are welded and fixed to form the positive electrode end and are electrically connected with the first electrode plate 110. The positive electrode terminal is electrically connected to the first electrode tab 110, which may be understood as that a plurality of adjacent positive electrode tabs are welded and fixed to the first electrode tab 110.

In the third case, the positive electrode terminal is formed by connecting the positive electrode tabs of the plurality of battery cells in parallel. The positive electrode end is formed by connecting positive electrode lugs of a plurality of battery cells in parallel, which means that the positive electrode lugs of the adjacent battery cells are respectively electrically connected with the first electrode plate 110. The positive electrode tabs of the adjacent multiple battery cells are electrically connected with the first electrode slice 110, which can be understood as that the positive electrode tabs are welded and fixed with the first electrode slice 110.

The negative electrode terminal can be formed by connecting the negative electrode lugs of any one of the electric cells in series, or can be formed by connecting the negative electrode lugs of a plurality of electric cells in parallel.

In the first case, the negative electrode terminal is formed by connecting the negative electrode tab of any one of the battery cells in series, and the negative electrode tab is electrically connected with the second electrode sheet 120, wherein the negative electrode tab is electrically connected with the second electrode sheet 120, which can be understood as that the negative electrode tab is welded and fixed with the second electrode sheet 120.

In the second case, the negative electrode terminal is formed by connecting the negative electrode tabs of the plurality of cells in parallel. The formation of the negative electrode terminal by connecting the negative electrode tabs of the plurality of battery cells in parallel means that the negative electrode tabs of the adjacent plurality of battery cells are welded and fixed, so as to form the negative electrode terminal, and the negative electrode terminal is electrically connected with the second electrode slice 120. The negative electrode terminal is electrically connected to the second electrode sheet 120, which may be understood as that a plurality of adjacent negative electrode tabs are welded and fixed to the second electrode sheet 120.

In the third case, the negative electrode terminal is formed by connecting the negative electrode tabs of the plurality of cells in parallel. The negative electrode terminal is formed by connecting the negative electrode lugs of the plurality of battery cells in parallel, which means that the negative electrode lugs of the adjacent plurality of battery cells are respectively electrically connected with the second electrode slice 120. The negative electrode tabs of the adjacent multiple battery cells are electrically connected with the second electrode slice 120, which can be understood as that the negative electrode tabs are welded and fixed with the second electrode slice 120.

In one implementation, the first cell 101 is disposed side by side with the second cell 102, and the second sub-side is disposed opposite the third sub-side.

In this implementation, as shown in fig. 6, the first cell 101 and the second cell 102 are arranged side by side, and the second sub-side face and the third sub-side face are arranged opposite to each other, so that the first tab pair and the second tab pair are also arranged opposite to each other. Therefore, the operation convenience of welding the first tab pair and the second tab pair is improved, and the connection stability of the first tab pair and the second tab pair is improved.

Further, in a specific implementation form, the first positive tab 1011 is disposed opposite to any one of the second positive tab 1021 and the second negative tab 1022; the first negative electrode tab 1012 is disposed opposite the other of the second positive electrode tab 1021 and the second negative electrode tab 10221022.

In this implementation manner, two cases may be specifically included:

in the first case, the first positive electrode tab 1011 is disposed opposite to the second positive electrode tab 1021, and the first negative electrode tab 1012 is disposed opposite to the second negative electrode tab 1022. When the first positive electrode tab 1011 and the second positive electrode tab 1021 are welded and fixed, it can be considered that the first end of the first battery cell 101 and the first end of the second battery cell 102 are connected in parallel; in the case where the first negative electrode tab 1012 and the second negative electrode tab 1022 are welded together, the second end of the first cell 101 and the second end of the second cell 102 may be considered to be connected in parallel. Further, when the battery cell unit 150 includes only two battery cells, the first positive electrode tab 1011 and the second positive electrode tab 1021 are welded and fixed to form a positive electrode terminal; the first negative tab 1012 and the second negative tab 1022 are welded together to form a negative terminal.

In the second case, the first positive electrode tab 1011 is disposed opposite to the second negative electrode tab 1022, and the first negative electrode tab 1012 is disposed opposite to the second positive electrode tab 1021. When the first positive tab 1011 and the second negative tab 1022 are welded and fixed, the first end of the first cell 101 and the first end of the second cell 102 may be considered to be connected in series. Further, when the battery cell unit 150 includes only two battery cells, the second positive electrode tab 1021 forms the positive electrode terminal, and the first negative electrode tab 1012 forms the negative electrode terminal.

When the first negative electrode tab 1012 and the second positive electrode tab 1021 are welded together, the second end of the first cell 101 and the second end of the second cell 102 may be considered to be connected in series. Further, when the battery cell unit 150 includes only two battery cells, the first positive tab 1011 forms a positive terminal and the second negative tab 1022 forms a negative terminal.

In this particular implementation form, the connection between the oppositely disposed tabs may enable series connection or parallel connection between adjacent cells. The first positive electrode tab 1011 is disposed opposite to any one of the second positive electrode tab 1021 and the second negative electrode tab 1022; the first negative electrode tab 1012 is disposed opposite to the other of the second positive electrode tab 1021 and the second negative electrode tab 1022. Because the adjacent lugs are oppositely arranged, the operation convenience of welding the lugs and the connection stability between the lugs are further improved.

Optionally, as shown in fig. 1 and 7, the battery pack further includes:

the signal acquisition module 400 is arranged on any side surface of the cell module 600, and the signal acquisition module 400 is connected with the cells in each cell assembly 100 and is used for acquiring at least one of voltage signals and temperature signals of the cells;

the cell assembly 100 further includes at least one signal acquisition unit 140, an input end of the signal acquisition unit 140 is connected with the cell, and an output end of the signal acquisition unit 140 is connected with the signal acquisition module 400.

In a specific embodiment, as shown in fig. 8, the battery cell assembly 100 may further include a buffer member 160, where the buffer member 160 may be disposed between the battery cell unit 150 and the support frame 130, so as to reduce interaction between the battery cell unit 150 and the support frame 130, protect the battery cell unit 150, and reserve an expansion space for the battery cell unit 150 when the battery cell unit 150 expands due to heat generated during operation, so as to reduce the risk of the battery module expanding or even exploding due to high temperature. The buffer 160 may also be disposed between two adjacent stacked cells, which is not limited herein. The cushioning member 160 may be foam or other material, and is not limited herein.

Optionally, the battery pack further includes a filter device 505 and a sealing device 506, where the filter device 505 is disposed at the first ventilation opening 501, and the sealing device 506 is disposed at the second ventilation opening 502.

As can be seen from the above, the first vent 501 may be used as an air inlet of the battery pack, and the second vent 502 may be used as an air outlet of the battery pack. In an embodiment of the present invention, in order to keep the cooling air clean and dry, a filter device 505 may be disposed at the first ventilation opening 501, and the filter device 505 may be a filter cotton or a filter screen to block external dust and moisture.

Meanwhile, since the above-mentioned sealing device is used to ensure the tightness of the battery pack, the safety problem caused by external solid or liquid entering the battery pack is avoided, and the sealing device 506, such as a shielding material such as rubber, may be disposed at the second air vent 502, which may be specifically set according to the actual needs.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is merely illustrative embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention should be covered. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. A battery pack, comprising: a shell, N cell modules and a busbar,

a first ventilation opening and a second ventilation opening are formed in the shell, a heat dissipation air channel is formed between the first ventilation opening and the second ventilation opening, and the heat dissipation air channel comprises a first air channel and a second air channel; the N battery cell modules are arranged in the shell, each battery cell module comprises a plurality of battery cell assemblies, each battery cell assembly comprises two battery cell units, a positive electrode end and a negative electrode end, the two battery cell units are oppositely arranged, battery cell lugs are arranged on opposite sides of the two battery cell units, gaps between the oppositely arranged battery cell units form a first air channel, the battery cell lugs of the N battery cell modules are positioned in the first air channel, and in the longitudinal direction, the projection of the battery cell lugs is positioned in the projection range of the first ventilation opening, and N is an integer larger than 1;

the busbar comprises a main body and a plurality of conductive pieces, wherein the plurality of conductive pieces are arranged on the main body side by side, a plurality of extending parts are formed at the first side edge of the main body in an extending way along the first side face, a first avoidance position is formed between any two adjacent extending parts, the first avoidance position is used for accommodating at least one of the positive electrode end and the negative electrode end, at least one of the positive electrode end and the negative electrode end is electrically connected with the extending parts, and the extending directions of the extending parts electrically connected with the positive electrode end or the negative electrode end of two battery cell units in the same battery cell assembly are opposite;

the main body is formed by connecting a plurality of connecting plates side by side, two adjacent connecting plates are detachably fixed, and a plurality of conductive pieces are arranged on the plurality of connecting plates in a one-to-one correspondence manner.

2. The battery pack of claim 1, wherein one end of the first air duct communicates with the first vent and one end of the second air duct communicates with the second vent.

3. The battery pack of claim 2, wherein the first air duct is disposed perpendicular to the second air duct, and wherein an end of the first air duct remote from the first vent is connected to the second air duct.

4. The battery pack of claim 2, wherein the first vent is disposed at a bottom or top of the housing, and the first air duct extends from the bottom of the housing to the top of the housing.

5. The battery pack of claim 1, wherein the plurality of extensions are disposed side-by-side along a first direction, the plurality of cell assemblies are stacked along the first direction, and the first direction is perpendicular to the heat dissipation air duct.

6. The battery pack according to claim 5, wherein the first end of the connecting plate is bent to form a bent portion, the bent portion includes the first side edge, the plurality of extending portions are arranged side by side along a first direction, the plurality of connecting members are detachably fixed along a second direction, and the second direction is perpendicular to the first direction and/or the second direction is perpendicular to the heat dissipation duct.

7. The battery pack of claim 1, wherein the positive terminal comprises a tab lead and a first electrode tab, and the negative terminal comprises a tab lead and a second electrode tab;

8. The battery pack of claim 7, wherein the first electrode tab and the second electrode tab are both positioned within the heat dissipation tunnel.

9. The battery pack of claim 1, wherein the cell assembly further comprises a support frame for securing the cell units, the support frames of the plurality of cell assemblies being connected in a stack;