CN218569144U - Battery pack and electric device - Google Patents

Abstract

The application provides a battery package and electric installation, the battery package includes: a plurality of cells, each of the cells comprising a cell casing and an electrode terminal extending from the cell casing; a first bus member connected to the electrode terminals of at least two of the battery cells; the circuit board and the first bus bar component are arranged on the same side of the battery cell shell; the circuit board is provided with a first through hole, the bus member includes a body and a connecting portion, at least a portion of the connecting portion is disposed in the first through hole and connected to the circuit board, and the body is connected to the electrode terminal. Among this application technical scheme, through reducing the lug connection area of first part and the circuit board that converges, be favorable to reducing the circuit board because of the risk that the heat altered shape produced the warpage, improve the structural strength and the stability of sampling structure, and then improve the reliability of battery package.

Description

Battery pack and electric device

Technical Field

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

Background

The battery pack includes a plurality of stacked battery cells, and in order to obtain information of voltage, temperature, and the like of the battery, a Printed Circuit Board Assembly (PCBA) process is adopted, that is, a Printed Circuit Board (PCB) blank Board is subjected to a Surface Mount Technology (SMT) process, and a bus bar is attached to the PCB, so as to collect information of the battery cells.

However, the inventor finds that when the battery pack needs excessive current, the PCBA needs to be attached to a plurality of bus members in a large area due to a large number of electrode terminals, and the PCB and the bus members are easily stressed unevenly due to different thermal expansion rates during attaching, so that the connection structure including the PCB and the bus members is warped, the sampling stability of the battery is affected, and the reliability of the battery is affected.

SUMMERY OF THE UTILITY MODEL

The application provides a battery package and electric installation, this battery package can improve sampling stability, and then improves the reliability of battery package.

In a first aspect, the present application provides a battery pack, comprising: a plurality of cells, each of the cells comprising a cell casing and an electrode terminal extending from the cell casing; a first bus bar member connected to the electrode terminals of at least two of the battery cells; the circuit board and the first bus bar component are arranged on the same side of the battery cell shell; the circuit board is provided with a first through hole, the bus member includes a body and a connecting portion, at least a portion of the connecting portion is disposed in the first through hole and connected to the circuit board, and the body is connected to the electrode terminal.

Among the above-mentioned technical scheme, first part of converging includes body and connecting portion, and the body is connected with the electrode terminal of electric core, and connecting portion are connected with the circuit board, realize the fixed function of first part of converging and the signal acquisition function of circuit board to electric core through connecting portion. And the connecting part is connected with the circuit board through the first through hole arranged on the circuit board, the plug connection area of the connecting part is small, and the connecting area of the first bus part and the circuit board is favorably reduced, so that the influence of the bus part on the shape, the structural stability and the like of the circuit board when the bus part is connected to the circuit board is reduced. Compared with a structure that the bus-bar part is integrally attached to the circuit board by adopting a chip-on-chip process, the technical scheme of the application is favorable for reducing the risk of uneven stress of the circuit board caused by the fact that the bus-bar part is attached to the circuit board, thereby reducing the risk that a sampling structure comprising the bus-bar part and the circuit board is warped due to thermal deformation, improving the structural strength and the performance stability of the sampling structure, and further improving the reliability of the whole battery pack.

In some embodiments of the first aspect of the present application, the bus bar member includes a plurality of the connection portions, the circuit board has a plurality of the first through holes, and the connection portions correspond to the first through holes one to one.

In the technical scheme, the bus component is connected with the circuit board through the connecting parts so as to improve the connection firmness of the bus component and the circuit board; simultaneously, the circuit board sets up a plurality of first through-holes in order to play multiple spot limiting displacement to the part that converges, further improves the force stability of body, improves the stability of being connected of the part of converging and circuit board, and then improves the reliability of battery package.

In some embodiments of the first aspect of the present application, the circuit board includes a first surface and a second surface opposite to each other along a first direction, the second surface is adjacent to the cell casing, and the body is disposed between the second surface and the cell casing.

Among the above-mentioned technical scheme, the body of the first part that converges sets up between circuit board and electric core, is favorable to shortening electric core and the first connection route who converges the part, improves the convenience and the connection reliability that first part and electric core are connected that converge to improve the performance reliability of battery package.

In some embodiments of the first aspect of the present application, the body and the electrode terminal at least partially overlap in the first direction; the circuit board is provided with a second through hole, and along the first direction, the projection of the body is at least partially overlapped with the projection of the second through hole.

Among the above-mentioned technical scheme, the second through-hole has been seted up to the circuit board, observes along the first direction, and the at least part of body can be followed the second through-hole and bared, conveniently welds this part of electrode terminal and body, reduces the circuit board and to the first connection operation formation position interference's of converging parts and electrode terminal the possibility to improve electrode terminal and the first connection quality and the connection stability who converges parts, be favorable to further improving battery package quality and reliability.

In some embodiments of the first aspect of the present application, along the first direction, a projection of the second through hole is located within a projection of the body.

Among the above-mentioned technical scheme, the projection of second through-hole is located the projection of body, and then the body can cover the second through-hole, like this, when carrying out laser welding through the second through-hole to body and electrode terminal, can restrict laser and follow the direct directive of second through-hole and electric core to reduce the possibility of laser damage electric core, be favorable to further improving battery package quality and reliability.

In some embodiments of the first aspect of the present application, the circuit board includes a first surface and a second surface that are disposed opposite to each other along a first direction, the first surface is away from the cell casing, the body is disposed on the first surface, the circuit board is provided with a third through hole, and the electrode terminal passes through the third through hole and is connected to the body.

Among the above-mentioned technical scheme, the body sets up in the one side that the circuit board deviates from electric core, the circuit board sets up the third through-hole simultaneously so that electrode terminal passes the third through-hole and stretches out from one side that the circuit board deviates from electric core, such structure is convenient for first part and the electrode terminal that converges is directly connected in one side that the circuit board deviates from electric core, reduce electric core, the circuit board causes the position to the connection of part and electrode terminal that converges and interferes, thereby be favorable to reducing electrode terminal and the connection operation degree of difficulty of part that converges, and then be favorable to improving the connection quality and the connection stability of part and electrode terminal that converge, be favorable to improving battery package quality and reliability equally.

In some embodiments of the first aspect of the present application, the circuit board is provided with a fourth through hole, the battery pack further includes a second bus member and a plurality of conductive sheets, the second bus member is disposed on the first surface, the plurality of conductive sheets are connected to the circuit board, and the electrode terminals of at least two of the battery cells are connected to the conductive sheets in a one-to-one correspondence manner after passing through the fourth through hole; the second bus bar member is connected to the electrode terminals of the at least two battery cells.

Among the above-mentioned technical scheme, the electrode terminal of two at least electric cores is connected with the conducting strip one-to-one, and the circuit board passes through the conducting strip and samples the electrode terminal who is connected with the conducting strip, is favorable to improving the stability of electric core sampling function. The second part that converges is connected with the electrode terminal of these at least two electric cores, plays and converges and overflows the effect, and such design is favorable to improving the mass flow current capacity of the second part that converges when improving every electrode terminal and the electric connection stability of circuit board, further improves the reliability of battery package. Meanwhile, the contact area between the conducting strip and the circuit board is small, so that the risk that the conducting strip causes warping of the circuit board is reduced, the structural strength and the performance stability of the sampling structure are improved, and the reliability of the whole battery pack is improved.

In some embodiments of the first aspect of the present application, a portion of the electrode terminal connected to the conductive sheet is located between the conductive sheet and the second bus member in the first direction.

Among the above-mentioned technical scheme, the part of electrode terminal is located conducting strip and second and converges between the part, and the electrode terminal of being convenient for converges with the second and joins in marriage the welding of part, and is convenient for increase electrode terminal and conducting strip and second and converges the area of being connected of part, is favorable to improving the overcurrent area that the second converges the part when improving connection stability. The conducting plate omits a reserved connecting position of the second confluence part, so that the structural size of the conducting plate is further reduced, and the connecting area of the conducting plate and the circuit board is further reduced. The overall scheme improves the overcurrent capacity of the second confluence part while reducing the warping degree of the circuit board, and gives consideration to the structural strength and stability of the sampling structure and the performance stability of the battery pack.

In some embodiments of the first aspect of the present application, a projection of the electrode terminal connected to the conductive sheet and a projection of the second bus member are separated from each other in the first direction.

Among the above-mentioned technical scheme, the projection of the second part of converging and the projection of the electrode terminal who is connected with the conducting strip are separated from each other, the second part of converging does not cover the connection region of electrode terminal and conducting strip, the second part of converging is connected with electrode terminal accessible conducting strip, and the connection region of electrode terminal and conducting strip and the connection region of conducting strip and second part of converging do not coincide, be favorable to improving the convenience that the battery wraps in groups, and be favorable to improving stability and reliability that the second part of converging, conducting strip and electrode terminal three are connected.

In a second aspect, an embodiment of the present application further provides an electric device, including the battery pack provided in the first aspect, where the battery pack is used to provide electric energy.

Among the above-mentioned technical scheme, the battery package of first aspect embodiment is through reducing the area of connection of parts and circuit board that converges, be favorable to reducing the influence to the aspects such as shape, the structural stability of circuit board when converging the parts and connecting in the circuit board, be favorable to reducing the circuit board and converge the parts and arouse the uneven risk of circuit board atress because of the thermal expansion rate is different when the paster in practical application, thereby reduce the warpage degree that the sampling structure including converging parts and circuit board produced because of the heat altered shape, be favorable to improving the stability of battery package sampling performance, promote the reliability of using the electric installation.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope.

Fig. 1 is a schematic structural diagram of a battery pack provided in some embodiments of the present application;

fig. 2 is an exploded view of a battery pack provided in some embodiments of the present application;

FIG. 3 is a schematic structural view of a first bus member provided in some embodiments of the present disclosure;

fig. 4 is a schematic view of a connection structure of the circuit board, which faces the cell casing, and the first bus bar member and the electrode terminal provided in some embodiments of the present application;

fig. 5 is a schematic structural diagram of a battery pack according to still other embodiments of the present application;

fig. 6 is a schematic diagram of a first partial structure of a battery pack according to another embodiment of the present application;

fig. 7 is a schematic view of a first overall structure of the battery according to the alternative embodiment shown in fig. 6;

fig. 8 is a schematic diagram of a second partial structure of a battery pack according to another embodiment of the present application;

fig. 9 is a schematic view of a second overall structure of the battery pack according to the other embodiment shown in fig. 8.

Icon: 100-a battery pack; 10-battery cell; 11-electrode terminals; 12-a cell casing; 20-a first bus member; 21-body; 211-a first body; 212-a second body; 22-a connecting portion; 221-a projection; 222-a splice; 30-a circuit board; 31-a first via; 32-a second via; 33-a third via; 34-a fourth through hole; 35-a first surface; 36-a second surface; 40-a second bus member; 50-a conductive sheet; 60-positive output pole; 70-negative output pole.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.

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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "plurality" means two or more, including two.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, and are used for convenience in describing the embodiments of the present application and for simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrated; the connection can be mechanical connection, electrical connection and signal connection; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

In the embodiments of the present application, like reference numerals denote like components, and in the different embodiments, detailed descriptions of the like components are omitted for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only illustrative and should not constitute any limitation to the present application.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The battery pack disclosed by the embodiment of the application can be but is not limited to be used in electric equipment such as electric two-wheeled vehicles, electric tools, unmanned aerial vehicles and energy storage equipment. The battery pack can be used as a power supply system of electric equipment, so that the charging and discharging and power utilization reliability of the power supply system can be improved.

The embodiment of the application provides an use power consumption device of battery package as power, power consumption device can be for but not limiting to electronic equipment, electric tool, electric two wheeler, unmanned aerial vehicle, energy storage equipment. The electronic equipment can comprise a mobile phone, a tablet, a notebook computer and the like, and the electric tool can comprise an electric drill, an electric saw and the like.

Referring to fig. 1 and 2, some embodiments of the present application provide a battery pack 100, where the battery pack 100 includes a plurality of battery cells 10, a first bus bar component 20, and a circuit board 30, each of the battery cells 10 includes a cell casing 12 and an electrode terminal 11, and the electrode terminal 11 extends from the cell casing 12. The first bus bar member 20 is connected to the electrode terminals 11 of at least two battery cells 10; the circuit board 30 and the first bus bar member 20 are disposed on the same side of the cell casing 12. The circuit board 30 is formed with a first through hole 31, the first bus member 20 includes a body 21 and a connecting portion 22, the connecting portion 22 is at least partially formed in the first through hole 31 and connected to the circuit board 30, and the body 21 is connected to the electrode terminal 11.

The battery pack 100 includes a plurality of battery cells 10, which means two or more. In the battery pack 100, the plurality of battery cells 10 are connected in series, in parallel, or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the plurality of battery cells 10. A plurality of battery cells 10 can be directly connected in series or in parallel or in series-parallel to form a battery pack 100; alternatively, a plurality of battery cells 10 may be connected in series or in parallel or in series-parallel to form a battery cell module, and the battery cell modules may be connected to each other to form the battery pack 100.

The battery pack 100 may further include other structures, for example, the battery pack 100 may further include a casing (not shown), and the electric core 10, the first bus bar member 20, and the circuit board 30 are accommodated in the casing.

Each of the battery cells 10 may be, but is not limited to, a lithium ion battery, a lithium sulfur battery, a sodium ion battery, a magnesium ion battery, a solid-state battery, or the like. The battery cell 10 may be a flat body, a rectangular parallelepiped, or other shapes. The casing of the cell 10 may be in the form of a hard shell, that is, the cell 10 is a hard shell cell; the battery cell 10 may also be in a soft-package form, that is, the battery cell 10 is a soft-package battery cell.

Each of the battery cells 10 may include a cell casing 12 and an electrode assembly accommodated in the cell casing 12, the electrode terminal 11 is connected to the electrode assembly and extends out of the cell casing 12, and the electrode terminal 11 of each of the battery cells 10 may include a positive electrode terminal and a negative electrode terminal.

The circuit board 30 is a support body for various electronic components, and is a carrier for interconnecting the electronic components, and the circuit board 30 in this embodiment may be a PCB. As shown in fig. 2, the circuit board 30 is disposed on one side of the cell casing 12 in the first direction X.

As shown in fig. 2, the electrode terminal 11, the first bus bar member 20, and the circuit board 30 are all located on the same side of the cell casing 12 in the first direction X, so that the connection between the electrode terminal 11 and the first bus bar member 20 is facilitated.

The first bus bar component 20 may be disposed on a side of the circuit board 30 facing the cell casing 12, or may be disposed on a side of the circuit board 30 facing away from the cell casing 12.

The first bus bar component 20 plays a role in bus and current collection, and the plurality of battery cells 10 can be connected to each other through the first bus bar component 20, so as to implement series connection, parallel connection or series-parallel connection of the plurality of battery cells 10. It is understood that the battery pack 100 may include a plurality of first bus members 20, and the number of the first bus members 20 may be set according to the number of the battery cells 10 and the series-parallel arrangement.

In the present embodiment, the first bus bar component 20 is connected to the electrode terminals 11 of at least two battery cells 10 to electrically connect the at least two battery cells 10, wherein the first bus bar component 20 may be connected to the electrode terminals 11 of two battery cells 10, or may be connected to the electrode terminals 11 of three, four, or even more battery cells 10 to electrically connect two or more battery cells 10.

As shown in fig. 1 and 2, the first bus member 20 includes a body 21 and a connecting portion 22, the circuit board 30 is provided with a first through hole 31, the connecting portion 22 is at least partially provided in the first through hole 31 and connected to the circuit board 30, the body 21 is not directly electrically connected to the circuit board 30, and the body 21 is electrically connected to the circuit board 30 through the connecting portion 22.

Specifically, the first through hole 31 penetrates the circuit board 30 in the thickness direction of the circuit board 30 (X-way shown in the figure), and at least a part of the connecting portion 22 protrudes into the first through hole 31 to be snapped or soldered to the circuit board 30 or adhered by a conductive adhesive.

The first through hole 31 is provided with a limiting effect on the connecting portion 22 by the circuit board 30, so that the stress stability of the connecting portion 22 is improved, and the connection stability of the connecting portion 22 and the circuit board 30 is further improved. And the connecting portion 22 is connected with the circuit board 30 through the first through hole 31 arranged on the circuit board 30, and the connecting area is small, which is beneficial to reducing the direct connecting area of the first bus member 20 and the circuit board 30, thereby reducing the influence on the shape, the structural stability and the like of the circuit board 30 when the first bus member 20 is connected with the circuit board 30. Compared with a structure that the bus part is integrally attached to the circuit board 30 by adopting a surface mounting process, the structure is beneficial to reducing the risk that the stress of the circuit board is uneven due to different thermal expansion rates when the circuit board 30 and the bus part are attached, so that the warping degree of a sampling structure comprising the first bus part 20 and the circuit board 30 due to thermal deformation is reduced, the structural strength and the performance stability of the sampling structure are improved, and the reliability of the whole battery pack is further improved.

The body 21 and the connecting portion 22 of the first bus member 20 may have various embodiments, for example, the connecting portion 22 may extend from an edge of the body 21, or may extend from one side of the body 21, and the connecting portion 22 may be integrally formed with the body 21, or may be separately disposed from the body 21 and connected by welding, screwing, adhering with a conductive adhesive, riveting, or the like. The electrode terminal 11 of the battery cell 10 may be connected to the connection portion 22, or may be connected to the body 21.

In some embodiments, the connecting portion 22 of the first bus member 20 is integrally formed with the body 21, which is beneficial to improve the structural stability of the first bus member 20 itself and improve the connection stability of the first bus member 20 and the circuit board 30.

Illustratively, as shown in fig. 2 and 3, the connecting portion 22 is integrally formed with the body 21, and the connecting portion 22 is a pin extending from an edge of the body 21. The leads may include projections 221 and engaging portions 222 connecting the projections 221 and the body 21, at least a portion of the projections 221 or the entirety of the projections 221 extend into the first through holes 31 to be engaged with the circuit board 30, soldered or adhered by conductive adhesive, so as to connect the connecting portion 22 to the circuit board 30.

The circuit board 30 and the first current collecting component 20 are connected through pins, the pins extend out of the edge of the body 21, the position of the fixed body 21 is more firm, the body 21 is dispersed by the pulling force of the pins and the pulling force of the electrode terminal 11 of the body 21, and the connection stability of the first current collecting component 20, the circuit board 30 and the electrode terminal 11 of the battery cell 10 is further improved.

In some embodiments, the first bus member 20 may be connected to the circuit board 30 through only one connection portion 22. In some embodiments, the first bus member 20 may also be connected to the circuit board 30 by a plurality of connections 22.

In some embodiments, as shown in fig. 2 and 3, the first bus member 20 includes a plurality of connection portions 22, the circuit board 30 is opened with a plurality of first through holes 31, and the connection portions 22 correspond to the first through holes 31 one by one.

The plurality of connecting portions 22 may be spaced apart from each other, when the first bus member 20 is mounted on the circuit board 30, each connecting portion 22 corresponds to one first through hole 31 on the circuit board 30, at least a portion of each connecting portion 22 is inserted into the corresponding first through hole 31, and each connecting portion 22 is snapped, soldered or adhered to the circuit board 30 by a conductive adhesive, so that the first bus member 20 is connected to the circuit board 30.

The first bus bar part 20 is connected with the circuit board 30 through the connecting parts 22, so that the firmness of connection between the first bus bar part 20 and the circuit board 30 is improved; meanwhile, the circuit board 30 is provided with a plurality of first through holes 31 to perform a multi-point limiting effect on the first bus bar component 20, so that the stress stability of the body 21 is further improved, and the connection stability of the first bus bar component 20 and the circuit board 30 is improved.

In some embodiments, the circuit board 30 includes a first surface 35 and a second surface 36 that are oppositely disposed along the first direction, the second surface 36 is adjacent to the cell casing 12, and the body 21 is disposed between the second surface 36 and the cell casing 12.

Specifically, as shown in fig. 1 to 4, the circuit board 30 and the first bus bar member 20 are located on the same side of the cell casing 12 in the first direction X, and the first bus bar member 20 is located between the circuit board 30 and the plurality of cell casings 12. The body 21 of the first bus bar member 20 is connected to the electrode terminals 11 of the battery cells 10 on the side facing the cell casing 12.

In some embodiments, the body 21 and the electrode terminal 11 at least partially overlap in the first direction X; the circuit board 30 is provided with a second through hole 32, and along the first direction X, a projection of the body 21 is at least partially overlapped with a projection of the second through hole 32.

The circuit board 30 is provided with a second through hole 32 penetrating through the circuit board 30 along the first direction X, and a portion of the body 21 is exposed from the second through hole 32 when viewed along the first direction X from a side of the circuit board 30 away from the first bus bar member 20. In some embodiments, all of the body 21 may also be exposed from within the second through-hole 32.

When a portion of the body 21 is exposed from the second through hole 32, any position of the body 21 may be exposed from the second through hole 32, and, for example, an intermediate position of the body 21 is exposed from the second through hole 32. Here, a side of the portion of the body 21 exposed from the second through hole 32 facing the cell casing 12 may correspond to a connection area of the body 21 and the electrode terminal 11. The electrode terminal 11 and the body 21 may be connected in various ways such as bonding with conductive paste, riveting, and the like. In some embodiments, the electrode terminal 11 and the body 21 are connected by welding, which is advantageous to improve the connection strength of the electrode terminal 11 and the body 21.

In some embodiments, along the first direction X, the projection of the second through hole 32 is located within the projection of the body 21.

Specifically, the body 21 covers the opening end of the second through hole 32 toward the cell casing 12 in the first direction X, and a part of the body 21 is exposed from the inside of the second through hole 32. In this way, when the body 21 and the electrode terminal 11 are laser-welded through the second through hole 32, laser can be limited from directly irradiating the battery cell 10 through the second through hole 32, so that the possibility that the battery cell 10 is damaged by the laser is reduced, and the quality of the battery cell 10 is further improved.

In still other embodiments, as shown in fig. 1 to 5, the circuit board 30 includes a first surface 35 and a second surface 36 that are oppositely disposed along the first direction X, the first surface 35 is far away from the cell casing 12, the body 21 is disposed on the first surface 35, the circuit board 30 is provided with a third through hole 33, and the electrode terminal 11 passes through the third through hole 33 and is connected to the body 21.

Specifically, the circuit board 30 and the first bus bar member 20 are located on the same side of the cell casing 12 in the first direction X, and the first bus bar member 20 is located on a side of the circuit board 30 facing away from the cell casing 12.

The circuit board 30 is provided with a third through hole 33 penetrating through the circuit board 30 along the first direction X, and the electrode terminal 11 penetrates through the third through hole 33 to be connected with the body 21.

The electrode terminal 11 may be connected to a side of the body 21 facing the circuit board 30, or may be connected to a side of the body 21 facing away from the circuit board 30. Illustratively, the electrode terminal 11 is soldered to a side surface of the body 21 facing away from the circuit board 30 through the third through hole 33.

In some embodiments, the body 21 may include a first body 211 and a plurality of second bodies 212 extending from the same side of the first body 211, the plurality of second bodies 212 may be arranged at intervals along a stacking direction of the plurality of battery cells 10, the third through holes 33 are located between two adjacent second bodies 212, the third through holes 33 correspond to the electrode terminals 11 one by one, and the electrode terminals 11 extend from the third through holes 33 and are connected to the second bodies 212 one by one. The coverage area of the body 21 and the circuit board 30 is reduced, and the risk of position interference of the body 21 to the plurality of electrode terminals 11 is reduced.

Illustratively, as shown in fig. 5, a plurality of battery cells 10 are stacked in the second direction Y, a plurality of electrode terminals 11 are arranged at intervals in the second direction Y, a plurality of second bodies 212 are arranged at intervals in the second direction Y, a plurality of third through holes 33 are arranged on the circuit board 30 in the second direction Y, and the electrode terminals 11 are soldered to a side of the corresponding second body 212 facing away from the circuit board 30 through the corresponding third through holes 33.

In some embodiments, as shown in fig. 5, the connection portion 22 may extend from the edge of the first body 211, the edge of the second body 212, or both the first body 211 and the second body 212 to connect with the circuit board 30.

In other embodiments, the circuit board 30 further defines a fourth through hole 34, the battery pack 100 further includes a second bus bar 40 disposed on the first surface 35 and a plurality of conductive sheets 50, the plurality of conductive sheets 50 are welded to the circuit board 30, and the electrode terminals 11 of at least two battery cells 10 penetrate through the fourth through holes 34 and are connected to the conductive sheets 50 in a one-to-one correspondence manner; the second bus bar member 40 is connected to the electrode terminals 11 of the at least two battery cells 10.

Specifically, the circuit board 30 is located on one side of the cell casing 12 in the first direction X, and the first bus member 20 and the second bus member 40 are also located on the same side of the cell casing 12 in the first direction X. The first and second bus bars 20, 40 are each located on a side of the circuit board 30 facing away from the cell casing 12. The first bus bar member 20 is connected to some of the electrode terminals 11 of the plurality of battery cells 10 in the battery pack 100, the second bus bar member 40 is connected to another of the electrode terminals 11 of the plurality of battery cells 10 in the battery pack 100, and the electrode terminals 11 connected to the second bus bar member 40 are uniformly connected to the plurality of conductive sheets 50 in a corresponding manner.

In some embodiments, the first and second bus bar parts 20 and 40 each perform a bus bar function and a current collecting function, and the plurality of battery cells 10 may be connected to each other through the first and second bus bar parts 20 and 40 to realize series connection, parallel connection or series-parallel connection of the plurality of battery cells 10.

For example, as shown in fig. 6 and 7, two first bus members 20 may be provided, wherein one first bus member 20 connects the positive terminals of the three battery cells 10 located at the first section of the connection path, and the first bus member 20 connects the positive output electrodes 60 of the battery pack 100. The circuit board 30 is provided with a plurality of third through holes 33, and the three positive terminals are each connected to the body 21 of the first bus member 20 through a corresponding one of the third through holes 33.

The other first bus bar 20 is connected to the negative terminals of the three battery cells 10 at the tail of the connection path, and the first bus bar 20 is connected to the negative output pole 70 of the battery pack 100, and the positive output pole 60 and the negative output pole 70 are used for outputting or inputting the electric energy of the battery pack. The three negative terminals are connected to the body 21 of the first bus member 20 through a corresponding one of the third through holes 33.

A part of the second bus member 40 is located between the two first bus members 20 on the connection path to connect the plurality of battery cells 10 to each other.

In some embodiments, the number of the second bus bar members 40 may be flexibly configured according to the number of the battery cells 10, and one or more second bus bar members 40 may be provided, as shown in fig. 7, three second bus bar members 40 are provided, and the plurality of battery cells 10 are connected in parallel and in series. The circuit board 30 may be provided with a plurality of fourth through holes 34, and the plurality of electrode terminals 11 connected to the conductive sheet 50 correspond to the fourth through holes 34 one to one and are connected to the second bus member 40 and the conductive sheet 50 after passing through the fourth through holes 34.

Illustratively, the electrode terminals 11 of the plurality of battery cells 10 are arranged at intervals along the second direction Y, the plurality of conductive sheets 50 are arranged at intervals along the second direction Y, the plurality of fourth through holes 34 are arranged on the circuit board 30 along the second direction Y, and the electrode terminals 11 penetrate through the corresponding fourth through holes 34 to be connected with the corresponding conductive sheets 50 and connected with the second bus bar member 40.

Alternatively, the electrode terminal 11 connected to the second bus member 40 may be connected to the second bus member 40 through the conductive sheet 50 after passing through the fourth through hole 34, or may be directly connected to the second bus member 40.

Alternatively, the conductive sheet 50 is soldered to the circuit board 30, and the electrode terminals 11 may be connected to the conductive sheet 50 on a side facing away from the circuit board 30 by soldering or bonding. The second bus member 40 may be connected to a side of the conductive sheet 50 facing away from the circuit board 30, or may be connected to a side of the electrode terminal 11 facing away from the conductive sheet 50.

In other embodiments, the electrode terminal 11 connected to the conductive sheet 50 is partially positioned between the conductive sheet 50 and the second bus member 40 along the first direction X. Specifically, the conductive sheet 50, the electrode terminal 11 connected to the conductive sheet 50, and the portion of the second bus bar member 40 are stacked in the first direction X. In this way, the structural size of the conductive sheet 50 is advantageously further reduced, thereby further reducing the connection area of the conductive sheet 50 with the circuit board 30. Meanwhile, the second bus member 40 overlaps with the portion of the electrode terminal 11 in the first direction X, which is advantageous to increase the connection area of the second bus member 40 and the electrode terminal 11, thereby increasing the flow area of the second bus member 40. The overall scheme improves the overcurrent capacity of the second bus member 40 while reducing the degree of warpage of the circuit board 30, and takes into account the structural strength and stability of the sampling structure and the performance stability of the battery pack 100.

In other embodiments, as shown in fig. 8 and 9, the projection of the electrode terminal 11 connected to the conductive sheet 50 is separated from the projection of the second bus member 40 along the first direction X.

Specifically, the second bus member 40 may be connected to the conductive sheet 50, and the second bus member 40 and the electrode terminal 11 are connected through the conductive sheet 50. Illustratively, as shown in fig. 9, the second bus member 40 is positioned at one side of the electrode terminal 11 in the third direction Z, the first direction X, the second direction Y, and the third direction Z are perpendicular two by two, and the second bus member 40 is directly welded to the conductive sheet 50. Such a design is advantageous in reducing the possibility of mutual interference between the connection of the electrode terminal 11 with the second bus member 40 and the conductive sheet 50, and facilitating the grouping of the battery packs 100.

Some embodiments of the present application further provide an electric device, including the battery pack 100 provided in any of the above embodiments, where the battery pack 100 is used to provide electric energy.

The electric device may be any one of the aforementioned apparatuses or systems using the battery pack 100.

Referring to fig. 1 to 4, in some embodiments, a battery pack 100 is provided, where the battery pack 100 includes a plurality of battery cells 10, a first bus bar 20, and a circuit board 30, each of the battery cells 10 includes a cell casing 12 and an electrode terminal 11, the electrode terminal 11 protrudes from the cell casing 12, the first bus bar 20 is connected to the electrode terminals 11 of at least two of the battery cells 10, the circuit board 30 and the first bus bar 20 are disposed on a same side of the cell casing 12 along a first direction X, the first bus bar 20 includes a body 21 and a plurality of connecting portions 22 connected to the body 21, and the plurality of connecting portions 22 are pins extending from an edge of the body 21. The body 21 is disposed between the circuit board 30 and the plurality of cell housings 12. The circuit board 30 is provided with a plurality of first through holes 31, the connecting portions 22 are in one-to-one correspondence with the first through holes 31, and portions of the connecting portions 22 are inserted into the first through holes 31 and connected with the circuit board 30, the body 21 is electrically connected with the circuit board 30 through the connecting portions 22, the electrode terminals 11 are connected to one side of the body 21 facing the cell casing 12, the circuit board 30 is provided with second through holes 32, and projections of the second through holes 32 are located in projections of the body 21 along the first direction X.

Referring to fig. 6 to 9, other embodiments of the present application provide a battery pack 100, where the battery pack 100 includes a plurality of battery cells 10, a first bus bar 20, a second bus bar 40, a conductive sheet 50, and a circuit board 30, each of the battery cells 10 includes a cell casing 12 and an electrode terminal 11, the electrode terminal 11 protrudes from the cell casing 12, the circuit board 30 is disposed on one side of the cell casing 12 along a first direction X, and the first bus bar 20, the conductive sheet 50, and the second bus bar 40 are disposed on one side of the circuit board 30 away from the cell casing 12. The circuit board 30 is provided with a first through hole 31, a third through hole 33 and a fourth through hole 34, the first bus member 20 includes a body 21 and a connecting portion 22, at least a portion of the connecting portion 22 is disposed in the first through hole 31 and connected to the circuit board 30, and the electrode terminals 11 of the at least two cells 10 are in one-to-one correspondence with the third through holes 33 and penetrate through the third through holes 33 to be connected to the body 21 of the first bus member 20.

The conducting strips 50 are welded to the circuit board 30, and the electrode terminals 11 of at least two battery cells 10 correspond to the fourth through holes 34 one by one and penetrate through the fourth through holes 34 to be connected to the conducting strips 50 one by one. The second bus bar member 40 is connected to the electrode terminals 11 of at least two battery cells 10 connected to the conductive sheet 50. The projection of the electrode terminal 11 connected to the conductive sheet 50 is separated from the projection of the second bus member 40 in the first direction X.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A battery pack, comprising:

a plurality of cells, each of the cells comprising a cell casing and an electrode terminal extending from the cell casing;

a first bus bar member connected to the electrode terminals of at least two of the battery cells;

the circuit board and the first bus bar component are arranged on the same side of the battery cell shell;

the first bus member includes a body and a connecting portion, at least a portion of the connecting portion is disposed in the first through hole and connected to the circuit board, and the body is connected to the electrode terminal.

2. The battery pack according to claim 1, wherein the first bus bar member includes a plurality of the connecting portions, the circuit board has a plurality of the first through holes, and the connecting portions correspond to the first through holes one to one.

3. The battery pack of claim 1 or 2, wherein the circuit board includes a first surface and a second surface opposite to each other along a first direction, the second surface is adjacent to the cell casing, and the body is disposed between the second surface and the cell casing.

4. The battery pack according to claim 3, wherein, in the first direction, the body and the electrode terminal at least partially overlap; the circuit board is provided with a second through hole, and along the first direction, the projection of the body is at least partially overlapped with the projection of the second through hole.

5. The battery pack of claim 4, wherein along the first direction, a projection of the second through-hole is located within a projection of the body.

6. The battery pack according to claim 1 or 2, wherein the circuit board includes a first surface and a second surface that are opposite to each other along a first direction, the first surface is away from the cell casing, the body is disposed on the first surface, the circuit board is provided with a third through hole, and the electrode terminal passes through the third through hole and is connected to the body.

7. The battery pack of claim 6, wherein the circuit board is provided with a fourth through hole, the battery pack further comprises a second bus member and a plurality of conductive sheets disposed on the first surface, the plurality of conductive sheets are connected to the circuit board, the electrode terminals of at least two of the electric cores penetrate through the fourth through hole and are connected to the conductive sheets in a one-to-one correspondence manner, and the second bus member is connected to the electrode terminals of the at least two of the electric cores.

8. The battery pack according to claim 7, wherein, in the first direction, the portion of the electrode terminal connected to the conductive sheet is located between the conductive sheet and the second bus member.

9. The battery pack according to claim 7, wherein a projection of the electrode terminal connected to the conductive sheet and a projection of the second bus member are separated from each other in the first direction.

10. An electric device comprising a battery pack according to any one of claims 1 to 9 for providing electric energy.

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