CN220456522U - Battery assembly - Google Patents

Abstract

The present disclosure relates to the field of battery technologies, and in particular, to a battery assembly, including: the solar cell comprises a plurality of cells, a heat exchange plate and a conductive bar, wherein the cells are sequentially arranged along a first direction, the cells comprise a shell and a ventilation mechanism, a first through hole is formed in the shell, and the ventilation mechanism seals the first through hole; the heat exchange plate is arranged between the first battery and the second battery, and the thickness of the heat exchange plate is D1; the conducting bar comprises a first connecting part, a buffer part and a second connecting part, wherein the first connecting part is connected with the first battery, the second connecting part is connected with the second battery, the buffer part is arranged between the first connecting part and the second connecting part, the width of the buffer part is D2, and the ratio range of D2 to D1 is 0.1-3. The gas in the shell is discharged through the ventilation mechanism, so that the pressure in the shell can be reduced, the expansion of the battery is reduced, and the buffer part provides buffer when the battery expands, so that the connection failure of the conductive bars and the battery is avoided.

Description

Battery assembly

Technical Field

The disclosure relates to the field of battery technology, and in particular relates to a battery assembly.

Background

Electric vehicles often are powered by a battery pack or other battery assembly that includes a plurality of batteries with a heat exchange plate disposed between adjacent batteries. The plurality of cells are connected by a conductive bar. The battery can take place to expand at duty cycle in-process, can produce effort with between the heat exchanger plate when the battery expands, and then lead to the busbar and battery to connect inefficacy to cause the heat exchanger plate to take place great deformation, make the heat exchanger plate heat exchange efficiency low.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The purpose of this disclosure is to provide a battery pack, and then promotes the heat transfer ability of heat exchange board at least to a certain extent to and guarantee the connection stability of conducting bar.

The present disclosure provides a battery assembly, the battery assembly comprising:

the batteries are sequentially arranged along a first direction, the batteries comprise a shell and a ventilation mechanism, a first through hole is formed in the shell, the ventilation mechanism is used for blocking the first through hole, and the ventilation mechanism is used for exhausting gas in the shell;

the heat exchange plate is arranged between a first battery and a second battery, the thickness of the heat exchange plate is D1, the thickness of the heat exchange plate is the dimension of the heat exchange plate along the first direction, and the first battery and the second battery are two adjacent batteries in the plurality of batteries;

the conducting bar comprises a first connecting part, a buffer part and a second connecting part, wherein the first connecting part is connected with the first battery, the second connecting part is connected with the second battery, the buffer part is arranged between the first connecting part and the second connecting part, the width of the buffer part is D2, the width of the buffer part is the size of the buffer part along the first direction, and the ratio range of D2 to D1 is 0.1-3.

The battery assembly comprises a plurality of batteries, heat exchange plates and conductive bars, wherein the batteries are sequentially arranged, the heat exchange plates are arranged between two adjacent batteries, the batteries comprise a shell and a ventilation mechanism, the ventilation mechanism is arranged on the shell, gas in the shell is discharged through the ventilation mechanism, the pressure in the shell can be reduced, the expansion of the batteries is reduced, the acting force on the heat exchange plates is reduced, and the problems that the heat exchange plates are not tightly attached to the batteries and the heat exchange efficiency of the heat exchange plates is reduced due to stress deformation are avoided; in addition, the conducting bar comprises a buffer part, the buffer part can absorb partial battery expansion, the influence of the battery expansion on the heat exchange plate can be further reduced, the heat exchange plate can fully exert the heat exchange capacity of the heat exchange plate and timely absorb the heat of the battery, further, the ratio range of the width D2 of the buffer part to the width D1 of the heat exchange plate is controlled to be 0.1-3, on one hand, the conducting bar buffer part cannot be too small, the buffer part is too small, the capacity of absorbing the battery expansion is reduced, the risk of deformation of the heat exchange plate caused by the battery expansion is caused, and when the buffer part is too small, the connection failure of the conducting bar and the battery is also easily caused, on the other hand, the buffer part cannot be too large, the width of the connecting part is small, and the overcurrent capacity of the conducting bar is poor.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic structural view of a first battery assembly provided in an exemplary embodiment of the present disclosure;

fig. 2 is a schematic structural view of a second battery assembly provided in an exemplary embodiment of the present disclosure;

fig. 3 is a schematic structural view of a battery according to an exemplary embodiment of the present disclosure;

fig. 4 is a schematic structural view of a third battery assembly provided in an exemplary embodiment of the present disclosure;

fig. 5 is a schematic structural view of a fourth battery pack according to an exemplary embodiment of the present disclosure.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Exemplary embodiments of the present disclosure provide a battery assembly, as shown in fig. 1 and 2, including: the heat exchange device comprises a plurality of batteries 10, heat exchange plates 20 and conductive bars 30, wherein the batteries 10 are sequentially arranged along a first direction, the batteries 10 comprise a shell 11 and a ventilation mechanism 12, a first through hole is formed in the shell 11, the ventilation mechanism 12 seals the first through hole, and the ventilation mechanism 12 is used for discharging gas in the shell 11; the heat exchange plate 20 is arranged between the first battery and the second battery, the thickness of the heat exchange plate 20 is D1, the thickness of the heat exchange plate 20 is the dimension of the heat exchange plate 20 along the first direction, and the first battery and the second battery are two adjacent batteries 10 in the plurality of batteries 10; the conductive bar 30 includes a first connection portion 31, a buffer portion 32, and a second connection portion 33, the first connection portion 31 is connected with the first battery, the second connection portion 33 is connected with the second battery, the buffer portion 32 is disposed between the first connection portion 31 and the second connection portion 33, the width of the buffer portion 32 is D2, the width of the buffer portion 32 is the dimension of the buffer portion 32 along the first direction, and the ratio of D2 to D1 ranges from 0.1 to 3.

The battery assembly provided by the embodiment of the disclosure comprises a plurality of batteries 10, heat exchange plates 20 and a conductive bar 30, wherein the plurality of batteries 10 are sequentially arranged, the heat exchange plates 20 are arranged between two adjacent batteries 10, each battery comprises a shell 11 and a ventilation mechanism 12, the ventilation mechanism 12 is arranged on the shell 11, and the ventilation mechanism 12 is used for exhausting gas in the shell 11, so that acting force on the heat exchange plates 20 is reduced, and the problems that the heat exchange plates 20 are not tightly attached to the batteries 10 and the heat exchange efficiency of the heat exchange plates 20 is reduced due to stress deformation are avoided; in addition, the conductive bar 30 includes a buffer portion 32, the buffer portion 32 can absorb part of the expansion of the battery 10, further reduce the influence of the expansion of the battery 10 on the heat exchange plate 20, so that the heat exchange plate 20 can fully exert its heat exchange capability to absorb the heat of the battery in time, further, the ratio range of the width D2 of the buffer portion 32 to the width D1 of the heat exchange plate 20 is controlled to be 0.1-3, on one hand, the buffer portion 32 of the conductive bar 30 cannot be too small, the buffer portion 32 is too small, the capability of absorbing the expansion of the battery 10 is reduced, and there is a risk that the expansion of the battery 10 causes the deformation of the heat exchange plate 20, and when the buffer portion 32 is too small, the connection failure of the conductive bar 30 and the battery 10 is easily caused, on the other hand, the buffer portion 32 cannot be too large, which causes the width of the connection portion to be small, resulting in poor overcurrent capability of the conductive bar 30.

The following will describe each part of the battery assembly provided in the embodiments of the present disclosure in detail:

the plurality of cells 10 are sequentially arranged in the first direction, and the plurality of cells 10 may form a battery pack. As shown in fig. 3, the battery 10 may include a housing 11, a battery core, a pole 13, and a ventilation mechanism 12, where a housing cavity is provided in the housing 11, the battery core is provided in the housing cavity, a first through hole is provided on the housing 11, the ventilation mechanism 12 seals the first through hole, and the ventilation mechanism 12 is used for exhausting gas in the housing 11. The pole 13 is provided to the housing 11, and the pole 13 is electrically connected to the battery cell.

The case 11 is used to form the outline of the battery 10 and protect the battery cells and the like in the case 11. The housing 11 may include two oppositely disposed first surfaces and a second surface between the two first surfaces, the first surface having an area larger than an area of the second surface. The battery 10 may be a rectangular parallelepiped battery 10, in which case the housing 11 includes two oppositely disposed first surfaces and four second surfaces, the first surfaces are rectangular, the four second surfaces are sequentially connected to form a rectangular frame, and the two first surfaces are respectively connected to two ends of the rectangular frame.

It is understood that the battery 10 may have other shapes in the embodiments of the present disclosure, for example, the battery 10 may be a triangular prism battery, a pentagonal prism battery, a hexagonal prism battery, or the like. When the battery 10 is a triangular prism battery, the first surface of the case 11 is triangular, and the case 11 has three second surfaces; when the battery 10 is a pentagonal prismatic battery, the first surface of the case 11 has a pentagon shape, and the case 11 has five second surfaces; when the battery 10 is a hexagonal-prism battery, the first surface of the case 11 has a hexagonal shape, and the case 11 has six second surfaces.

The first surfaces of two adjacent cells 10 in the battery pack are opposite, i.e., the cells 10 are stacked on a large surface. A heat exchange plate 20 is arranged between two adjacent batteries 10, the heat exchange plate 20 is abutted against the first surface of the battery 10, or a heat conducting adhesive layer is arranged between the heat exchange plate 20 and the first surface of the battery 10 and is respectively connected with the heat exchange plate 20 and the battery 10.

By way of example, the four second surfaces of the prismatic cells may include oppositely disposed top and bottom panels and side panels between the top and bottom panels. The top panel is provided with a pole 13, and the ventilation mechanism 12 may be provided on the top panel, or the ventilation mechanism 12 may be provided on the bottom panel, or the ventilation mechanism 12 may be provided on the side panel.

The battery cell is arranged in the shell 11, and the battery cell can comprise a battery cell main body, a first tab and a second tab, wherein the first tab and the second tab extend out from the battery cell main body. Illustratively, the first and second tabs extend from an end of the cell body proximate the terminal post 13. Of course, in practical applications, the first tab and the second tab may be distributed in other ways, which is not limited by the embodiment of the disclosure.

The battery cell comprises a first pole piece, a second pole piece and a diaphragm, and the first pole piece, the diaphragm and the second pole piece are integrated into the battery cell. The first pole piece may include a positive current collector and an active material layer, the active material layer is disposed on the positive current collector, the second pole piece may include a negative current collector and a negative coating, and the negative coating is coated on the negative current collector.

In one embodiment, the cell is a laminated cell having a first pole piece, a second pole piece opposite the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece stacked one on top of the other such that pairs of the first pole piece and the second pole piece are stacked to form a laminated cell. Or the battery cell can be a winding type battery cell, namely, the first pole piece, the second pole piece opposite to the first pole piece and the diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain the winding type battery cell.

The battery cell may be an ejector type battery cell, that is, the first tab and the second tab extend from a surface of the battery cell main body facing the pole 13, and the positions of the first tab and the second tab respectively correspond to the positions of the first pole and the second pole.

It can be understood that the battery cell can also be a side-out battery cell, and the first tab and the second tab are respectively led out from two sides of the battery cell main body. The first tab is located between the cell body and the first side of the housing 11, and the second tab is located between the cell body and the second side of the housing 11. When the battery cell is a side-out type battery cell, the first tab and the first pole are connected through the first connecting piece, the first connecting piece is in a right-angle structure, one right-angle side is connected with the first tab, and the other right-angle side is connected with the first pole. The second lug is connected with the second pole through a second connecting sheet, the second connecting sheet is in a right-angle structure, one side of the right angle is connected with the second lug, and the other side of the right angle is connected with the second pole.

The heat exchange plate 20 is arranged between the first surfaces of two adjacent batteries 10, and a heat exchange cavity is arranged in the heat exchange plate 20 and is used for transmitting heat exchange media. The heat exchange chamber extends from one end of the heat exchange plate 20 to the other end of the heat exchange plate 20, i.e. the heat exchange chamber extends through the heat exchange plate 20.

The end of the heat exchange plate 20 is provided with a liquid collecting pipe, and the heat exchange plate 20 is communicated with the liquid collecting pipe. The liquid receiving pipe is used for inputting the cooling medium into the heat exchange plate 20, or the liquid receiving pipe is used for outputting the cooling medium in the heat exchange plate 20. The battery assembly includes a first liquid collecting member and a second liquid collecting member, wherein the first liquid collecting member and the second liquid collecting member are respectively arranged at two ends of the heat exchange plate 20, the first liquid collecting member is a liquid inlet liquid collecting pipe, and the second liquid collecting member is a liquid outlet liquid collecting pipe.

The thickness of the heat exchange plate 20 is 3mm to 10mm, and the thickness of the heat exchange plate 20 is the dimension of the heat exchange plate 20 in the arrangement direction of the cells 10. For example, the thickness of the heat exchange plate 20 may be 3mm, 4mm, 6mm, 7mm, 8mm, 10mm, or the like. The thickness of the heat exchange plate 20 is larger than 3mm, so that enough space is reserved in the heat exchange plate 20 to transmit heat exchange media, the thickness of the heat exchange plate 20 is smaller than 10mm, the heat exchange plate 20 is prevented from occupying excessive space of the battery 10 device, and the energy density of the battery 10 device is guaranteed. The thickness of the heat exchange plate 20 is 3mm-10mm, although the heat exchange and energy density requirements can be met, the heat exchange plate 20 with the thickness of 3mm-10mm is easy to deform, and in the embodiment of the disclosure, the pressure inside the battery 10 can be reduced by arranging the ventilation mechanism 12 on the battery 10, so that the pressure of the battery 10 to the heat exchange plate 20 is reduced, and the deformation of the heat exchange plate 20 is avoided.

The heat exchange cavity is internally provided with a support rib which divides the heat exchange cavity into a plurality of heat exchange channels. The support ribs may divide the heat exchange chamber into a plurality of uniform heat exchange channels, or the support ribs may divide the heat exchange chamber into non-uniform heat exchange channels.

By way of example, the heat exchange plate 20 may include a first heat exchange surface and a second heat exchange surface that are parallel with a space therebetween. The space between the first heat exchange surface and the second heat exchange surface forms a heat exchange cavity, the first heat exchange surface is opposite to the first surface of the first battery, the second heat exchange surface is opposite to the first surface of the second battery, and the first battery and the second battery are two adjacent batteries 10 in the battery pack. The support ribs are connected to the first panel and the second panel, respectively, and extend from one end of the heat exchange plate 20 to the other end of the heat exchange plate 20.

The ventilation mechanism 12 is provided on the housing 11, for example, the ventilation mechanism 12 may be provided on the first surface or the second surface of the housing 11. When the ventilation mechanism 12 is provided on the first surface of the housing 11, in order to ensure that the first surface of the housing 11 and the heat exchange plate 20 are in close contact, a recess may be provided on the first surface of the housing 11, and the ventilation mechanism 12 is provided in the recess. When the venting mechanism 12 is disposed on the second surface, the venting mechanism 12 may be disposed on the bottom panel or the top panel, the ventilation mechanism 12 is provided on the second surface to avoid interference between the ventilation mechanism 12 and the heat exchange plate 20.

In a possible embodiment, the ventilation mechanism 12 comprises a support 121 and a ventilation membrane 122, a first through hole is arranged on the shell 11, the support 121 is connected with the shell 11, the support 121 seals the first through hole, and a second through hole is arranged on the support 121; the gas permeable membrane 122 is connected to the support 121, and the gas permeable membrane 122 covers the second through hole.

Wherein, the support 121 may be provided with one or more second through holes, and the air-permeable membrane 122 covers the one or more second through holes. When a plurality of second through holes are formed in the support 121, the second through holes are formed at intervals, the air permeable membrane 122 is connected with the surface of the support 121 around the second through holes, namely, the strength of the air permeable membrane 122 is increased by being connected with the support 121, and the problems that the strength of the air permeable membrane 122 is low and the air permeable membrane is easy to tear due to overlarge area of the air permeable holes are avoided.

The air-permeable membrane 122 may be disposed on a side of the support 121 away from the cell, or the air-permeable membrane 122 may be disposed on a side of the support 121 close to the cell, or the air-permeable membrane 122 may be embedded in the support 121. The gas permeable membrane 122 and the support 121 may be connected by means of adhesive or hot melt connection, etc.

Illustratively, the stand 121 includes a support body and a boss, the support body is fitted into the first through hole, and the support body is welded to the housing 11; the bulge is connected with the support body, and the bulge extends to the support body one side of keeping away from the electric core, and the ventilated membrane 122 is located the bulge and is kept away from the one end of support body.

The protruding portion may include boss and exhaust piece, and the one end and the supporter of boss are connected, and the exhaust piece shutoff is kept away from the one end of electric core in the boss, and the exhaust piece is located to the second through-hole, and ventilated membrane 122 is connected with the exhaust piece.

The side of the support body away from the cell is flush with the side of the housing 11 away from the cell. The support body is annular or approximately annular structure, and the shape of the outer edge of the support body and the first through hole match, and the outer edge of the support body and the side wall of the first through hole are welded. For example, when the first through hole is a round hole, the outer edge of the support body is round. The boss and the inner ring of the support body are connected, for example, the boss and the support body may be integrally formed, or the boss and the support body may be connected by welding or the like.

The exhaust sheet may be a flat plate or a structure similar to a flat plate, one end of the exhaust sheet, which is far away from the battery cell, is connected to the boss, a plane is formed on one surface of the exhaust sheet, which is far away from the battery cell, a second through hole is formed on the flat plate, and the ventilation film 122 is connected to the plane.

In another possible embodiment, the ventilation mechanism 12 includes a ventilation film 122, a first through hole is provided on the housing 11, the ventilation film 122 is connected to the housing 11, and the ventilation film 122 covers the first through hole. The breathable film 122 includes a high molecular material that generally has breathable water blocking properties, so that the breathable film 122 can stably discharge gas generated inside the battery while blocking permeation of external moisture. For example, the polymer material may be selected from FEP (fluorinated ethylene propylene copolymer), PCTFE (polychlorotrifluoroethylene), and the like.

Wherein, the housing 11 may be provided with one or more first through holes, and the one or more first through holes may be provided on one surface (first surface or second surface) of the housing 11. The air-permeable film 122 is connected to the surface of the housing 11 where the first through hole is provided, and the air-permeable film 122 may be connected by bonding, hot melt connection, or the like.

When being provided with a plurality of first through-holes on casing 11, a plurality of first through-holes interval sets up, and ventilated membrane 122 and the surface connection of casing 11 around the first through-hole, namely through being connected with casing 11 and having increased ventilated membrane 122's intensity, avoided first through-hole area too big and the ventilated membrane 122 intensity that leads to low, easily torn problem.

It should be noted that, in the embodiment of the present disclosure, the ventilation mechanism 12 has a ventilation function with a certain size when the pressure in the battery 10 reaches a predetermined value, so that the purpose of unidirectional exhaust can be achieved, and in addition, the ventilation mechanism 12 with a breathing effect can be completely sealed when the pressure is lower than the predetermined value.

The conductive bar 30 includes a first connection portion 31, a buffer portion 32 and a second connection portion 33, the first connection portion 31 is connected with the first battery, the second connection portion 33 is connected with the second battery, the buffer portion 32 is arranged between the first connection portion 31 and the second connection portion 33, the width of the buffer portion 32 is D2, and the ratio of D2 to D1 is in the range of 0.1-3. For example, the ratio of D2 to D1 is 0.1, 0.2, 0.5, 0.8, 0.9, 1, or the like. The ratio of D2 to D1 ranges from 0.1 to 3, which effectively controls the width of the buffer portion 32, facilitates the production and manufacture of the conductive bars 30, and if D1 and D2 are not too small, the ventilation mechanism 12 is present to absorb part of the gas, but if the gas yield in the battery 10 is relatively large, the ventilation mechanism 12 is not in time, the battery is expanded, the heat exchange plate 20 is extruded, the buffer portion 32 can absorb part of the expansion of the battery, and the ventilation mechanism 12 is combined to reduce the influence of the expansion of the battery 10 on the heat exchange plate 20 to the greatest extent, so that the maximum heat exchange capacity of the heat exchange plate 20 is maintained, and therefore, the buffer portion 32 cannot be too small in size; the buffer 32 should not be excessively large, and the overcurrent capacity may be deteriorated by the excessive amount. Further, the ratio of D2 to D1 is in the range of 0.1 to 2.

Wherein the first connection portion 31 is connected to the post 13 of the first battery, for example, the first connection portion 31 is welded to the post 13 of the first battery; the second connection portion 33 is connected to the post 13 of the second battery, for example, the second connection portion 33 is welded to the post 13 of the second battery. The pole 13 is provided on the top panel of the battery 10, and the conductive bar 30 is disposed opposite to the top panel of the battery 10.

The buffer portion 32 is recessed in a direction approaching the heat exchange plate 20; or the buffer portion 32 is protruded in a direction away from the heat exchange plate 20. For example, the conductive bars 30 may be formed by punching, and a buffer portion 32 for buffering is formed by punching at the middle portion of the plate material.

The buffer portion 32 extends from the first connecting portion 31 to the second connecting portion 33 along a predetermined trajectory, and the predetermined trajectory is arc-shaped. That is, the buffer portion 32 smoothly transits from the first connecting portion 31 to the second connecting portion 33, so that the stress concentration of the conductive bars 30 is avoided and the buffer capability is improved.

In a possible embodiment, the buffer portion 32 extends from the first connection portion 31 to the second connection portion 33, and the buffer portion 32 is recessed to a side close to the heat exchange portion. For example, the conductive bars 30 may be formed by punching, and the middle portion of the plate is punched downward to form a recess toward the heat exchange plate 20. By arranging the buffer portion 32 as a concave portion bent toward the heat exchange plate 20, the space utilization rate of the battery assembly can be improved, and the buffer portion 32 is prevented from occupying excessive space at the top of the battery 10.

In another possible embodiment, as shown in fig. 4, the buffer portion 32 extends from the first connection portion 31 to the second connection portion 33, and the buffer portion 32 protrudes to a side away from the heat exchange portion. For example, the conductive bars 30 may be formed by punching, and the middle portion of the plate is punched upward to form a protruding portion away from the heat exchange plate 20. By providing the buffer portion 32 as a convex portion bent away from the heat exchange plate 20, the distance between the buffer portion 32 and the heat exchange plate 20 can be increased, and the insulating performance of the buffer portion 32 and the heat exchange plate 20 can be improved.

The height of the buffer portion 32 is H, the ratio of H to D2 is in the range of 0.05-1, the height of the buffer portion 32 is the dimension of the buffer portion 32 in the second direction, and the second direction is perpendicular to the side of the battery facing the conductive bars. For example, the ratio of H to D2 may be 0.05, 0.08, 0.1, 0.2, 0.3, 0.5, 0.8, or 1, etc. By setting the ratio of H to D2 in the range of 0.05 to 1, on the one hand, the cushioning ability of the cushioning portion 32 can be ensured, and on the other hand, the cushioning portion 32 and the heat exchange plate 20 or the harness plate or the like can be prevented from interfering with each other. Further, the ratio of H to D2 is in the range of 0.1-0.8.

For example, when the thickness of the heat exchange plate 20 is 3mm to 10mm, the width of the buffer portion 32 is 0.5mm to 15mm. For example, the width of the buffer 32 may be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm. Further, the width of the buffer 32 is 0.5mm to 10mm.

The tensile strength of the conductive bars 30 is 50Mpa-200Mpa. For example, the tensile strength of the conductive bars 30 is 50Mpa, 60Mpa, 80Mpa, 100Mpa, 150Mpa or 200Mpa, etc. The tensile strength of the conductive bars 30 is 50-200 Mpa, which ensures that the conductive bars 30 are buffered by deformation of the buffering portion 32 when the battery 10 is expanded, and the conductive bars 30 are not broken.

The tensile strength of the conductive bar 30 in the embodiment of the disclosure is 50Mpa-200Mpa, which means that the tensile strength of the weak portion of the conductive bar 30 is 50Mpa-200Mpa, for example, the tensile strength of the buffer portion 32 is 50Mpa-200Mpa, or the tensile strength of the connection portion between the buffer portion 32 and the first connection portion 31 and the second connection portion 33 is 50Mpa-200Mpa.

The buffer portion 32 and the heat exchange plate 20 are disposed opposite to each other, and a projection of the buffer portion 32 on a surface of the heat exchange plate 20 facing the buffer portion 32 is at least partially overlapped with the heat exchange plate 20. The first connection portion 31 and the second connection portion 33 are symmetrically arranged, that is, the width of the first connection portion 31 is equal to the width of the second connection portion 33. Of course, in practical applications, the first connection portion 31 and the second connection portion 33 may also be disposed asymmetrically, which is not limited in the embodiment of the disclosure.

The width of the conductive bar 30 is D3, the ratio of D2 to D3 is 0.05-0.5, and the width of the conductive bar 30 is the dimension of the conductive bar 30 along the first direction. By setting the ratio of D2 to D3 in the embodiment of the present disclosure to 0.05-0.5, the widths of the first connection portion 31 and the second connection portion 33 in the conductive bar 30 are ensured, that is, the overcurrent capability of the connection portion of the conductive bar 30 and the pole 13 is ensured. Further, the ratio of D2 to D3 is 0.1-0.3.

It should be noted that, in the embodiment of the present disclosure, the battery 10 may have a length direction, a height direction, and a thickness direction, where the length direction, the height direction, and the thickness direction are perpendicular to each other, and the first direction may be the thickness direction and the second direction may be the height direction.

In the embodiment of the present disclosure, the battery pack may be a battery pack, and when the battery pack is a battery pack, as shown in fig. 5, the battery pack may further include a case 40, a power management system, and the like, the case 40 being for forming an outer contour of the battery pack, and the case 40 being for protecting devices within the case 40. The battery 10, the heat exchange plate 20 and the conductive bars 30 are provided in the case 40. The power management system is provided in the case 40, and is used for management of charge and discharge of the battery 10, thermal management of the battery 10, and the like.

The case 40 may include a bottom plate and a frame connected to the bottom plate, and the frame and the bottom plate form at least one battery compartment in which the battery 10, the heat exchange plate 20, and the conductive bars 30 are disposed. By way of example, the housing 40 may have a rectangular or approximately rectangular configuration. The bottom plate is a flat plate structure, and supports the battery 10. The frame may include a first edge, a second edge the third side and the fourth side are arranged on the same plane, the first edge, the second edge, the third edge and the fourth edge are sequentially connected end to form a rectangular frame body. One or more separation beams can be arranged in the frame, and the separation beams divide the space in the frame into a plurality of battery cabins. For example, a first separation beam and a second separation beam are vertically arranged in the frame, and the space in the frame is separated into four battery cabins by the first separation beam and the second separation beam.

The battery assembly provided by the embodiment of the disclosure comprises a plurality of batteries 10, heat exchange plates 20 and a conductive bar 30, wherein the plurality of batteries 10 are sequentially arranged, the heat exchange plates 20 are arranged between two adjacent batteries 10, each battery comprises a shell 11 and a ventilation mechanism 12, the ventilation mechanism 12 is arranged on the shell 11, and the ventilation mechanism 12 is used for exhausting gas in the shell 11, so that acting force on the heat exchange plates 20 is reduced, and the problems that the heat exchange plates 20 are not tightly attached to the batteries 10 and the heat exchange efficiency of the heat exchange plates 20 is reduced due to stress deformation are avoided; in addition, the conductive bar 30 includes a buffer portion 32, the buffer portion 32 can absorb part of the expansion of the battery 10, further reduce the influence of the expansion of the battery 10 on the heat exchange plate 20, so that the heat exchange plate 20 can fully exert its heat exchange capability to absorb the heat of the battery in time, further, the ratio range of the width D2 of the buffer portion 32 to the width D1 of the heat exchange plate 20 is controlled to be 0.1-3, on one hand, the buffer portion 32 of the conductive bar 30 cannot be too small, the buffer portion 32 is too small, the capability of absorbing the expansion of the battery 10 is reduced, and there is a risk that the expansion of the battery 10 causes the deformation of the heat exchange plate 20, and when the buffer portion 32 is too small, the connection failure of the conductive bar 30 and the battery 10 is easily caused, on the other hand, the buffer portion 32 cannot be too large, which causes the width of the connection portion to be small, resulting in poor overcurrent capability of the conductive bar 30.

The battery assembly provided by the embodiment of the disclosure can be applied to an electric vehicle, and when the battery assembly is used for the electric vehicle, the battery assembly can be a battery pack which is installed on the electric vehicle and provides energy for the electric vehicle.

In practice, the battery pack may be mounted to the frame of an electric vehicle. The battery pack can be fixedly connected with the frame. Or the battery pack can be a modularized battery pack which can be detachably connected to the vehicle body, so that the battery pack is convenient to replace.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (17)

1. A battery assembly, the battery assembly comprising:

the batteries are sequentially arranged along a first direction, the batteries comprise a shell and a ventilation mechanism, a first through hole is formed in the shell, the ventilation mechanism is used for blocking the first through hole, and the ventilation mechanism is used for exhausting gas in the shell;

the heat exchange plate is arranged between a first battery and a second battery, the thickness of the heat exchange plate is D1, the thickness of the heat exchange plate is the dimension of the heat exchange plate along the first direction, and the first battery and the second battery are two adjacent batteries in the plurality of batteries;

the conducting bar comprises a first connecting part, a buffer part and a second connecting part, wherein the first connecting part is connected with the first battery, the second connecting part is connected with the second battery, the buffer part is arranged between the first connecting part and the second connecting part, the width of the buffer part is D2, the width of the buffer part is the size of the buffer part along the first direction, and the ratio range of D2 to D1 is 0.1-3.

2. The battery assembly of claim 1, wherein the ratio of D2 to D1 ranges from 0.1 to 2.

3. The battery pack according to claim 1, wherein the buffer portion is a recess in the conductive row in a direction approaching the heat exchange plate;

or the buffer part is a bulge on the conducting bar along the direction far away from the heat exchange plate.

4. The battery assembly of claim 3, wherein the buffer portion extends from the first connection portion to the second connection portion along a predetermined trajectory, the predetermined trajectory being an arc.

5. The battery assembly of claim 4, wherein the height of the buffer is H, the ratio of H to D2 is in the range of 0.05-1, and the height of the buffer is the dimension of the buffer in a second direction perpendicular to a face of the battery facing the conductive row.

6. The battery assembly of claim 5, wherein the ratio of H to D2 ranges from 0.1 to 0.8.

7. The battery assembly of claim 1, wherein the heat exchange plate has a thickness of 3mm to 10mm.

8. The battery assembly of claim 7, wherein the buffer has a width of 0.5mm to 15mm.

9. The battery assembly of claim 8, wherein the buffer has a width of 0.5mm to 10mm.

10. The battery assembly of claim 1, wherein the conductive bars have a tensile strength of 50Mpa to 200Mpa.

11. The battery assembly of claim 1, wherein the buffer portion and the heat exchange plate are disposed opposite each other, and a projection of the buffer portion on a side of the heat exchange plate facing the buffer portion is at least partially coincident with the heat exchange plate.

12. The battery assembly of claim 1, wherein the width of the conductive bars is D3, the ratio of D2 to D3 is 0.05-0.5, and the width of the conductive bars is the dimension of the conductive bars in the first direction.

13. The battery assembly of claim 12, wherein the ratio of D2 to D3 is 0.1-0.3.

14. The battery pack of claim 1, wherein the housing comprises two oppositely disposed first surfaces and a plurality of second surfaces disposed between the two first surfaces, the first surfaces having an area greater than an area of the second surfaces, the heat exchange plate being disposed between the first surfaces of adjacent two of the cells.

15. The battery assembly of claim 14, wherein the venting mechanism comprises:

and the breathable film is arranged on the second surface of the shell, and covers the first through hole.

16. The battery assembly of claim 1, wherein the venting mechanism comprises:

the support is arranged on the second surface of the shell, the first through hole is plugged by the support, and a second through hole is formed in the support;

and the breathable film is connected with the support, and the breathable film seals the second through hole.

17. The battery assembly of claim 1, wherein the battery further comprises:

the pole is arranged on the shell, the first connecting part is connected with the pole of the first battery, and the second connecting part is connected with the pole of the second battery.