CN117937021A - Battery pack and vehicle - Google Patents

Abstract

The application discloses a battery pack and a vehicle, wherein the battery pack comprises; a bottom plate; the frame is arranged around the periphery of the bottom plate and defines a battery cell accommodating cavity with the bottom plate; the separation beams are arranged on the bottom plate and positioned in the battery cell accommodating cavity, the separation beams are configured to extend in the first direction and at least one of the separation beams is spaced in the second direction, and a mounting cavity is defined between two adjacent separation beams or is defined by the separation beams and the frame edge; the battery cell groups are accommodated in the mounting cavity and are configured into a plurality of groups which are sequentially arranged in the second direction; each cell group is provided with a plurality of cell monomers, and the plurality of cell monomers extend in the second direction and are sequentially distributed along the first direction; and/or the plurality of battery cell monomers extend in the first direction and are sequentially arranged along the second direction. According to the application, a longitudinal beam structure is not arranged between the battery cells in the battery pack, so that the internal space of the battery pack is saved, the energy density of the battery pack is improved, and the lightweight of the battery pack can be realized.

Description

Battery pack and vehicle

Technical Field

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

Background

In the prior art, set up the longeron in the battery package in order to support fixedly to the electric core, longeron structure has increased the weight of battery package, has also taken up the space in the battery package, is unfavorable for the lightweight design and the promotion of energy density of battery package. In addition, in the process of assembling the battery cell, the assembling steps are complex.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present application is to propose a battery pack. According to the application, a longitudinal beam structure is not arranged between the battery cells in the battery pack, so that the internal space of the battery pack is saved, the energy density of the battery pack is improved, and the lightweight of the battery pack can be realized.

The invention further provides a vehicle with the battery pack.

The battery pack according to the present invention includes: a bottom plate; the frame is arranged around the periphery of the bottom plate and defines a battery cell accommodating cavity with the bottom plate; the separation beams are arranged on the bottom plate and positioned in the battery cell accommodating cavity, the separation beams are configured to extend in the first direction and at least one of the separation beams is spaced in the second direction, and a mounting cavity is defined between two adjacent separation beams or is defined by the separation beams and the frame edge; the battery cell groups are accommodated in the mounting cavity and are configured into a plurality of groups which are sequentially arranged in the second direction; each cell group is provided with a plurality of cell monomers, and the plurality of cell monomers extend in the second direction and are sequentially distributed along the first direction; and/or a plurality of the battery cell monomers extend in the first direction and are sequentially arranged along the second direction.

According to the battery pack, at least one separation beam is arranged in the battery cell accommodating cavity so as to define the mounting cavity between two adjacent separation beams or between the separation beam and the edge of the frame, a plurality of battery cell groups can be mounted in each mounting cavity, each battery cell group is fixed with the bottom plate, the separation beam and the frame, longitudinal beam supporting and fixing are not needed to be arranged between the battery cell groups, the internal space of the battery pack is saved, the weight of the battery pack is reduced, and more battery cell groups can be mounted in the battery pack so as to increase the energy density of the battery pack.

According to one embodiment of the invention, two ends of the separation beams extend to be connected with the frame, and a first limit surface and a second limit surface are respectively formed on the surfaces, facing each other, of two adjacent separation beams, and the first limit surface and the second limit surface are opposite to each other in a second direction; the two ends of the plurality of battery cell groups are respectively abutted against the first limiting surface and the second limiting surface, and two adjacent battery cell groups in the first direction are arranged at intervals.

According to one embodiment of the present invention, the battery cell group includes: a first cell configured as a plurality of cells arranged in sequence in a second direction; the second battery cells are configured into a plurality of second battery cells which are sequentially arranged in the second direction, and any one of the first battery cells and the second battery cells are correspondingly arranged in the first direction.

According to an embodiment of the present invention, the battery pack further includes: the end plates are arranged at two ends of the battery cell group, supporting surfaces and matching surfaces are respectively formed on two sides of the end plates in the thickness direction, the supporting surfaces are suitable for being attached to the end surfaces of the battery cell group, and the matching surfaces are suitable for being attached to the separation beams; wherein the bottom of the end plate forms a guide surface which is arranged obliquely in a direction towards the bottom towards the support surface.

According to one embodiment of the invention, the engagement surface is formed with a detent recess adapted to engage the pawl.

According to one embodiment of the present invention, the battery cell group further includes: the heating film extends in the second direction, two sides of the heating film in the thickness direction are respectively attached to the first electric core and the second electric core, and two ends of the heating film are respectively fixed with the end plates positioned at two ends of the electric core group.

According to one embodiment of the present invention, the heating film includes: the first heating piece is attached to the first electric core and is suitable for heating the first electric core; the second heating piece is attached to the second electric core and is suitable for heating the second electric core; the heat insulation piece is arranged between the first heating piece and the second heating piece.

According to one embodiment of the invention, a first gap is formed between two adjacent first electric cores, and a second gap is formed between two adjacent second electric cores; the heating film assembly is provided with an avoidance hole penetrating in the first direction, one end of the avoidance hole is opposite to the first gap, and the other end of the avoidance hole is opposite to the second gap.

According to an embodiment of the present invention, the battery pack further includes: the buffer piece is arranged between two adjacent battery cell monomers.

According to one embodiment of the invention, the surfaces of two adjacent battery cells facing each other are provided with a battery cell large surface, and the buffer piece is arranged around at least part of the periphery of the battery cell large surface.

According to one embodiment of the invention, a plurality of connection areas are formed on the bottom plate, the connection areas extend between two adjacent separation beams, and the connection areas are arranged at intervals in the first direction; wherein the battery pack further comprises: the adhesive layers are respectively arranged in the corresponding connecting areas and are suitable for connecting the battery cell group with the bottom plate.

A vehicle according to another embodiment of the present invention is briefly described below.

The vehicle according to the present invention has the battery pack according to any one of the embodiments described above, and since the vehicle according to the present invention includes the battery pack according to any one of the embodiments described above, the battery pack in the vehicle according to the present invention is light in weight and greater in energy density.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a block diagram of a battery pack floor, frame and spacer beams according to one embodiment of the invention;

fig. 2 is a schematic diagram of a battery pack cell group arrangement according to one embodiment of the invention;

FIG. 3 is a block diagram of a battery pack end plate according to one embodiment of the invention;

fig. 4 is a schematic diagram of a battery pack cell arrangement according to one embodiment of the invention;

Fig. 5 is a schematic view of a heating film structure of a battery pack according to an embodiment of the present invention;

fig. 6 is a view showing a structure of a heating film of a battery pack according to an embodiment of the present invention;

Fig. 7 is a block diagram of a buffer between cells according to one embodiment of the invention.

Reference numerals:

A battery pack 1;

a bottom plate 11; a frame 12; a partition beam 13;

A battery cell group 14, a first battery cell 141, a second battery cell 142;

end plate 15, mating surface 151, positioning groove 152, relief groove 153, guide 154, guide surface 1541, weight-reducing cavity 155, and staking hole 156;

heating film 16, first heating sheet 161, first electrical connector 1611, second heating sheet 162, second electrical connector 1621, thermal insulator 163, relief hole 164; and a buffer 17.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the prior art, set up the longeron in the battery package in order to support fixedly to the electric core, longeron structure has increased the weight of battery package, has also taken up the space in the battery package, is unfavorable for the lightweight design and the promotion of energy density of battery package. In addition, in the process of assembling the battery cells, the assembling steps are complex, so that the assembling time is long.

A battery pack 1 according to an embodiment of the present invention is described below with reference to fig. 1 to 7.

The battery pack 1 according to the present invention includes a bottom plate 11, a frame 12, a partition beam 13, and a cell group 14, the frame 12 being circumferentially disposed on the outer periphery of the bottom plate 11 and defining a cell accommodating chamber with the bottom plate 11; the separation beams 13 are arranged on the bottom plate 11 and are positioned in the cell accommodating cavities, the separation beams 13 are configured to extend in the first direction and are spaced in the second direction, a mounting cavity is defined between two adjacent separation beams 13 or the separation beams 13 and the edges of the frame 12 define a mounting cavity; the battery cell groups 14 are accommodated in the mounting cavity and are configured into a plurality of groups which are sequentially arranged in the second direction; each of the battery cell groups 14 is provided with a plurality of battery cell monomers, and the battery cell monomers extend in the second direction and are sequentially arranged along the first direction; and/or the plurality of battery cell monomers extend in the first direction and are sequentially arranged along the second direction.

Specifically, the first direction may be configured as the length direction of the bottom plate 11, the second direction may be configured as the width direction of the bottom plate 11, the partition beams 13 extend along the first direction and are configured as at least one of the partition beams arranged at intervals in the second direction, two ends of each partition beam 13 are fixed with the frame 12, when the partition beams 13 are configured as a plurality of partition beams arranged at intervals in the second direction, a mounting cavity is defined between two adjacent partition beams 13, when the partition beams 13 are configured as one partition beam extending in the first direction, the edges of the partition beams 13 and the frame 12 define a mounting cavity, the cell groups 14 are arranged in the mounting cavity, the cell groups 14 in each mounting cavity are configured as a plurality of groups sequentially arranged in the second direction, each cell group 14 is fixed with the partition beams 13 and the frame 12 and the bottom plate 11, a longitudinal beam structure is not arranged between the cell groups 14, so that the weight of the cell pack 1 is reduced, the light quantization of the cell pack 1 is realized, and because of the longitudinal beam structure is not arranged in the cell pack 1, the inner space of the cell pack 1 is saved, more cell groups 14 can be accommodated in the cell pack 1, and the energy density is increased; each of the battery cell groups 14 is provided with a plurality of battery cell units, each of the battery cell units is configured as a column in the second direction, each of the battery cell groups 14 includes two columns of battery cell units, wherein each of the battery cell units can be configured as a plurality of battery cell units which extend in the first direction and are sequentially arranged in the second direction, each of the battery cell units can be configured as a column in the second direction, each of the battery cell units can also be configured as a single battery cell unit which extends in the second direction, each of the battery cell units 14 can include a plurality of battery cell units which extend in the second direction and are sequentially arranged in the first direction, and each of the battery cell units can also include a plurality of battery cell units which extend in the first direction and are sequentially arranged in the second direction.

According to the battery pack 1, at least one separation beam 13 is arranged in the battery cell accommodating cavity so as to define an installation cavity between two adjacent separation beams 13 or define an installation cavity between the separation beams 13 and the edge of the frame 12, a plurality of battery cell groups 14 can be installed in each installation cavity, each battery cell group 14 is fixed with the bottom plate 11, the separation beam 13 and the frame 12, longitudinal beam supporting and fixing are not needed among the battery cell groups 14, the internal space of the battery pack 1 is saved, the weight of the battery pack 1 is reduced, and more battery cell groups 14 can be installed in the battery pack 1 so as to increase the energy density of the battery pack 1.

According to one embodiment of the invention, two ends of the separation beams 13 extend to be connected with the frame 12, and the surfaces, facing each other, of the two adjacent separation beams 13 are respectively formed with a first limit surface and a second limit surface, and the first limit surface and the second limit surface are opposite to each other in the second direction; two ends of the plurality of battery cell groups 14 are respectively abutted against the first limiting surface and the second limiting surface, and two adjacent battery cell groups 14 in the first direction are arranged at intervals.

The two ends of each cell group 14 are respectively abutted against the first limiting surface and the second limiting surface, the bottom of each cell group 14 is fixed with the bottom plate 11, the cell groups 14 are ensured to be stably arranged in the battery pack 1, the cell groups 14 can be fixed without a longitudinal beam structure between the cell groups 14, and the weight of the battery pack 1 is reduced; two adjacent cell groups 14 are arranged at intervals in the first direction, so that the situation that heat aggregation and uneven temperature occur in the heating process of the cell groups 14 is avoided, and the cell groups 14 are ensured to work in a proper temperature range.

According to an embodiment of the present invention, the battery cell group 14 includes a first battery cell 141 and a second battery cell 142, the first battery cell 141 is configured as a plurality of battery cells sequentially arranged in the second direction, the second battery cell 142 is configured as a plurality of battery cells sequentially arranged in the second direction, and any one of the first battery cells 141 and the second battery cell 142 is disposed correspondingly in the first direction.

Specifically, the first electric core 141 and the second electric core 142 are respectively configured as a plurality of electric cores which are sequentially arranged in the second direction, one electric core group 14 comprises two rows of electric cores which extend in the second direction and are opposite to each other in the first direction, and by arranging one row of the first electric cores 141 and one row of the second electric cores 142 at intervals in the first direction in parallel and configuring one electric core group 14, the intervals between the first electric cores 141 and the second electric cores 142 can enable the first electric cores 141 and the second electric cores 142 to have relatively independent spaces when heating, so that the heat aggregation and the uneven temperature degree are relieved, and the temperature difference inside the electric core group 14 is reduced.

According to one embodiment of the present invention, the battery pack 1 further includes end plates 15, the end plates 15 are disposed at two ends of the cell stack 14, the end plates 15 are respectively formed with a supporting surface and a mating surface 151 at two sides in the thickness direction, the supporting surface is adapted to be disposed in a fitting manner with the end surfaces of the cell stack 14, and the mating surface 151 is adapted to be disposed in a fitting manner with the partition beams 13; wherein the bottom of the end plate 15 forms a guiding surface 1541, the guiding surface 1541 being arranged obliquely towards the supporting surface in a direction towards the bottom.

Specifically, the supporting surface of the end plate 15 is attached to the end surface of the battery pack 14, so as to limit the movement of the battery pack 14 and protect the battery pack 14 from external impact and friction, when the battery pack 14 is placed in the battery pack 1 by forming the guiding surface 1541 at the bottom of the end plate 15, the guiding surface 1541 of the end plate 15 contacts the frame 12 of the battery pack 1, and since the guiding surface 1541 is inclined towards the supporting surface in the direction towards the bottom, the guiding surface 1541 can guide the battery pack 14 to smoothly enter the battery pack 1 when the battery pack 14 moves into the battery pack 1, the installation of the battery pack 14 is convenient, and the guiding surface 1541 and the frame 12 of the battery pack 1 cooperate to generate a fastening force for pressing the battery pack 14, so that the battery pack 14 is more stable and firm in the battery pack 1. After guide surface 1541 is disengaged from frame 12, mating surface 151 will contact and mate with spacer beam 13 to secure cell stack 14 within battery pack 1.

In some embodiments, the end plate 15 is provided with a plurality of guide portions 154 spaced apart in the width direction of the end plate 15, and a guide surface 1541 is formed on an end surface of each guide portion 154 facing the bottom. By providing the end plate 15 with the plurality of guide portions 154 arranged at intervals in the width direction of the end plate 15, the plurality of guide portions 154 can cooperate together to guide the core pack 14 into the battery pack 1, improving reliability. Each guide 154 has a guide surface 1541 formed on a bottom-facing end surface, the guide surfaces 1541 providing stable guidance for the cell stack 14. The plurality of guide portions 154 are arranged at intervals in the width direction of the end plate 15, so that the battery cell group 14 can be guided more uniformly when entering the battery pack 1, and the battery cell group 14 can be more stable and smooth in the moving process.

The thickness of the guide portion 154 is d and satisfies: d is more than or equal to 2.5mm and less than or equal to 3.5mm. The thickness of the guide 154 may be any value from 2.5mm to 3.5mm. By configuring the guide 154 to have a thickness d of 2.5mm or more and 3.5mm or less, the guide 154 can have sufficient strength and rigidity, the guide 154 is more stable and reliable in guiding the cell stack 14 into the battery pack 1, and the thickness of the guide 154 is suitably favorable for reducing the weight of the end plate 15 and reducing the cost.

Glue overflow grooves 1542 which are opened towards the guide surfaces 1541 are formed in each guide portion 154, and the glue overflow grooves 1542 which are opened towards the guide surfaces 1541 are formed in each guide portion 154, so that overflowed glue can flow into the glue overflow grooves 1542 in the process that the guide portions 154 guide the core groups 14 to enter the battery pack 1, glue can not be accumulated between the end plates 15 and the battery pack 1 shell, stress concentration caused by glue overflow is reduced, and product quality is improved.

In some embodiments, the end plate 15 includes a base plate provided with a support surface on one side and a support portion 1541 provided on the other side of the base plate; the supporting part is arranged on the other side of the substrate, the bottom of the supporting part is connected with the guiding part 154, the supporting part is provided with a matching surface 151, and the guiding part 154 is in rounded transition with the edge of the supporting part. The supporting portion is disposed on the substrate, a surface of the substrate facing away from the supporting portion is a supporting surface, and a surface of the supporting portion facing away from the substrate is a mating surface 151. By providing the guide portion 154 on the substrate, the guide portion 154 is located at the bottom of the support portion and is connected to the edge of the support portion, and in the process of moving the battery cell group 14 into the battery pack 1, the guide portion 154 is contacted with the edge of the casing of the battery pack 1, and then the support portion is contacted with the edge of the casing of the battery pack 1. Through the edge fillet transition of the guiding part 154 and the supporting part, the transition of the curved surface of the fillet shape is passed through at the joint of the guiding surface 1541 and the matching surface 151, the clamping degree of the electric core group 14 in the process of moving into the battery pack 1 can be reduced, the stress distribution can be more uniform, and the structural strength of the end plate 15 is enhanced.

In some embodiments, the angle between the guiding surface 1541 and the mating surface 151 is greater than or equal to 150 degrees and less than or equal to 170 degrees, the guiding portion 154 can effectively guide the battery cell 14 into the battery pack 1, the battery pack 1 housing can also generate enough fastening force for the battery cell 14 to compress the battery cell 14, and the transition between the guiding surface 1541 and the mating surface 151 is smooth, so that no significant clamping of the battery cell 14 occurs when moving into the battery pack 1.

According to one embodiment of the present invention, the engagement surface 151 is formed with a positioning groove 152 adapted to engage the pawl.

Specifically, the positioning grooves 152 are arranged on the matching surface 151 and are two positioning grooves 152 arranged at intervals in the width direction, a limiting space is formed in the positioning grooves 152, the clamping jaws are carrying equipment capable of moving the battery cell group 14 into the battery pack 1, the clamping jaws are accommodated in the limiting space and can be matched with the battery cell group 14 to move the battery cell group 14, the clamping jaws and the battery cell group 14 are conveniently and fixedly positioned in a matched mode, stable transportation and accurate placement of the battery cell group 14 are effectively achieved, production efficiency is improved, the two positioning grooves 152 are arranged at intervals in the width direction and are positioned on two sides of the matching surface 151 in the width direction, each positioning groove 152 can be matched with one clamping jaw in a positioning mode, the stability of the battery cell group 14 in the moving process is improved, and the battery cell group 14 is prevented from shifting and shaking.

According to an embodiment of the present invention, the battery cell group 14 further includes a heating film 16, the heating film 16 extends in the second direction, two sides of the heating film 16 in the thickness direction are respectively attached to the first battery cell 141 and the second battery cell 142, and two ends of the heating film 16 are respectively fixed to the end plates 15 at two ends of the battery cell group 14.

Specifically, the heating film 16 is disposed between the first electric core 141 and the second electric core 142, two sides of the thickness direction of the heating film 16 are respectively attached to the first electric core 141 and the second electric core 142, the heating film 16 can generate heat to heat the first electric core 141 and the second electric core 142 at the same time, the heating efficiency of the battery pack 1 is improved, the temperature of the battery pack 1 is reasonably controlled, the service life of the electric core can be prolonged, the performance of the electric core can be kept, two rows of electric cores in the battery pack 1 can be heated by one heating film 16, the number of the heating films 16 in the battery pack 1 is reduced to optimize the space utilization inside the battery pack 1, and accordingly the size and weight of the battery pack 1 are reduced, and the light weight of the battery pack 1 is realized.

The battery pack 1 of the present application adopts natural air cooling to dissipate heat, and no heat dissipation structure such as a liquid cooling plate is provided in the battery pack 1, so as to reduce the weight of the battery pack 1.

According to one embodiment of the present invention, the heating film 16 includes a first heating sheet 161, a second heating sheet 162, and a heat insulator 163, wherein the first heating sheet 161 is disposed in contact with the first cell group 14 and is adapted to heat the first cell 141; the second heating plate 162 is adhered to the second electric core set 14 and is suitable for heating the second electric core 142; the heat insulator 163 is disposed between the first heating sheet 161 and the second heating sheet 162. By providing the heat insulating member 163 between the first heating sheet 161 and the second heating sheet 162, the heat insulating member 163 has a heat insulating effect, so that heat loss between the first cell 141 and the second cell 142 can be reduced, and heat in the battery pack 1 can be more slowly dissipated to the outside, so that the cells in the battery pack 1 can be kept at a proper temperature for a long time, and the cell performance is more stable, wherein the heat insulating member 163 can be configured as heat insulating foam.

Wherein, be provided with the electric connection piece between first heating piece 161 and the second heating piece 162, the electric connection piece is connected first heating piece 161 and second heating piece 162 with external power source, for heating membrane 16 power supply.

According to one embodiment of the present invention, a first gap is formed between two adjacent first cells 141, and a second gap is formed between two adjacent second cells 142; the heating film 16 assembly is formed with a relief hole 164 penetrating in the first direction, one end of the relief hole 164 is opposite to the first slit, and the other end of the relief hole 164 is opposite to the second slit.

Specifically, through being provided with first gap between two adjacent first electric core 141 to set up the second gap between two adjacent second electric core 142, first gap and second gap can alleviate the pressure that produces because of thermal expansion and mechanical deformation between first electric core 141 and the second electric core 142, reduce the risk that extrudees each other and destroy between the electric core, prolong the life of battery package 1, through setting up on heating film 16 and dodging hole 164 that link up in first direction, dodging hole 164's one end and first gap are just right, dodging hole 164's the other end and second gap are just right, the heating gate can not produce the heat in dodging hole 164 department, the heat that heating film 16 produced can fully transmit for first electric core 141 and second electric core 142, can reduce the risk that the electric core is local overheated, promote the quality and the reliability of battery package 1.

According to an embodiment of the present invention, the battery pack 1 further includes a buffer member 17, where the buffer member 17 is disposed between two adjacent battery cells, and the buffer member 17 may be configured as a buffer foam, where the buffer foam is disposed between two adjacent battery cells, and the buffer foam has elasticity and provides elasticity for two adjacent battery cells, so as to provide buffering between the battery cells and avoid collision damage between the battery cells.

According to one embodiment of the invention, the surfaces of two adjacent battery cells facing each other are provided with a large battery cell surface, the buffer member 17 surrounds at least part of the periphery of the large battery cell surface, the buffer member 17 can be in an annular structure and surrounds at least part of the periphery of the large battery cell surface, two sides of the buffer member 17 are respectively abutted against the two battery cells to buffer collision impact between the two adjacent battery cells, damage of vibration to the battery cells is reduced, and the buffer member 17 surrounds at least part of the periphery of the large battery cell surface, so that the size of the buffer member 17 can be reduced, the cost can be reduced, and the weight of the battery pack 1 can be reduced.

According to one embodiment of the present invention, the base plate 11 is formed with a plurality of connection areas extending between two adjacent partition beams 13, the plurality of connection areas being spaced apart in the first direction; wherein the battery pack 1 further comprises: the adhesive layers are respectively arranged in the corresponding connecting areas and are suitable for connecting the battery cell group 14 with the bottom plate 11.

Specifically, a plurality of connection areas are arranged on the bottom plate 11, a plurality of battery cell groups 14 are correspondingly arranged in each connection area, the battery cell capacity of the battery pack 1 is improved, an adhesive layer is correspondingly arranged in each connection area, and the battery cell groups 14 are connected with the bottom plate 11 through the adhesive layer, so that the number of fixing beams for fixing the battery cell groups 14 in the battery pack 1 can be reduced, the space utilization rate of the battery cell groups 14 in the battery pack 1 is reduced, and the size of the battery pack 1 is reduced.

In some embodiments, the end plate 15 includes a first end plate and a second end plate, the first end plate is disposed at an end of the first electric core 141, the second end plate is disposed at an end of the second electric core 142, the sides of the first end plate and the second end plate close to each other are respectively provided with a fitting hole, the battery pack 1 further includes rivets configured in a plurality, each rivet is used for riveting the fitting hole of the first heating plate 161 and the first end plate or riveting the fitting hole of the second heating plate 162 and the fitting hole of the second end plate, the rivets can pass through the corresponding fitting holes when the first end plate and the second end plate are assembled to rivet the first heating plate 161 and the first end plate or the second heating plate 162 and the second end plate together, the first heating plate 161 can keep fit with the first electric core 141, the heat generated by the first heating plate 161 can be effectively transferred to the first electric core 141, the second heating plate 162 can keep fit with the second electric core 142, and the heat generated by the second heating plate 162 can effectively transfer the heat generated by the second heating plate 162 to the second electric core 142, and reliability of the battery pack 14 is improved.

In some embodiments, an adhesive layer is disposed between the first heating sheet 161 and the first cell 141 and/or between the second heating sheet 162 and the second cell 142, and the adhesive layer may be disposed only between the first heating sheet 161 and the first cell 141; the adhesive layer may be disposed only between the second heating plate 162 and the second electrical core 142; the adhesive layer may be disposed between the first heating sheet 161 and the first cell 141 or between the second heating sheet 162 and the second cell 142. By providing an adhesive layer between the first heating sheet 161 and the first cell 141 and/or between the second heating sheet 162 and the second cell 142, stability and reliability of the cell stack 14 can be enhanced. The adhesive layer may tightly secure the heater chip to the cell stack 14, making it difficult to separate between the first heater chip 161 and the first cell 141 and/or between the second heater chip 162 and the second cell 142. The adhesive layer can also effectively transfer heat to the first electrical core 141 and/or the second electrical core 142, so that the heat transfer efficiency is improved, and the stability and reliability of the electrical core set 14 are improved.

In some embodiments, the electrical connectors include a first electrical connector 1611 and a second electrical connector 1621, the first electrical connector 1611 is disposed at two ends of the first heating sheet 161, the second electrical connector 1621 is disposed at two ends of the second heating sheet 162, and the first electrical connector 1611 and the second electrical connector 1621 extend away from each other in the first direction. By arranging the first electric connectors 1611 at two ends of the first heating sheet 161, the first heating sheet 161 can be electrically connected with an external power supply, and current flows from one first electric connector 1611 to the other first electric connector 1611, so that the current transmission and the control of the heating function are realized. Similarly, by providing the second electrical connectors 1621 at both ends of the second heating sheet 162, the second heating sheet 162 can also be electrically connected to an external power source, and current flows from one second electrical connector 1621 to the other second electrical connector 1621, thereby realizing the transmission of current and the control of the heating function. By configuring the first electrical connector 1611 and the second electrical connector 1621 to extend away from each other in the first direction, the mutual interference between the first electrical connector 1611 and the second electrical connector 1621 is reduced, the current cross interference is not easy to occur, the wire is not easy to occur the misconnection when connecting the first electrical connector 1611 or the second electrical connector 1621, and the safety and the stability are improved.

In some embodiments, the mating surface 151 is formed with a relief groove 153, and the relief groove 153 is disposed at an edge of the mating surface 151 and communicates with the rivet hole 156, and the relief groove 153 is adapted to receive a rivet. By arranging the avoidance groove 153 on the matching surface 151, the avoidance groove 153 can accommodate rivets, the rivets can easily pass through the riveting holes 156 in the riveting process, the production efficiency is improved, workers can see the positions of the rivets through the avoidance groove 153 in the riveting process, and the risk of the rivets flying out to hurt people is reduced. Meanwhile, the avoidance grooves 153 can limit the moving range of the rivet, and accidental risks caused by movement of the rivet are reduced.

The rivet holes 156 and the escape grooves 153 are respectively configured in a plurality of spaced apart manner in the height direction of the end plate 15, and each rivet hole 156 communicates with one escape groove 153. Through constructing the riveting hole 156 respectively with dodging recess 153 and being a plurality of that set up at end plate 15 body direction of height interval, heating membrane 16 can correspond the cooperation riveting through a plurality of rivets and a plurality of riveting hole 156 on end plate 15, every rivet can all correspond to accept in one dodge recess 153, improves joint strength and stability to set up a plurality of riveting hole 156 interval and can disperse the stress when riveting better, reduce local stress concentration degree, improve the connection security.

In some embodiments, the relief groove 153 is provided on the bottom wall of the positioning groove 152. By arranging the avoidance groove 153 on the bottom wall of the positioning groove 152, the avoidance groove 153 can be formed more easily, the manufacturing process can be simplified, and the processing cost can be reduced. The cross-sectional area of the relief groove 153 gradually decreases in the depth direction of the relief groove 153. Through the structure of the avoidance groove 153 that the cross-sectional area is gradually reduced in the depth direction of the avoidance groove 153, the avoidance groove 153 is more efficient in the forming process, the production efficiency of the end plate 15 is improved, the stress distribution can be optimized, the stress concentration coefficient is reduced, and the strength of the end plate 15 is improved.

In some embodiments, a plurality of spaced apart weight reduction cavities 155 are formed in the end plate 15. By providing a plurality of weight reduction cavities 155 in the end plate 15 at intervals, the weight of the end plate 15 can be reduced, and the plurality of weight reduction cavities 155 at intervals are beneficial to ensuring the strength and rigidity of the end plate 15. When the end plate 15 is impacted, the weight-reducing cavity 155 can absorb energy, so that the impact of the impact on the end plate 15 is reduced, and the durability of the end plate 15 is improved.

A vehicle according to another embodiment of the present invention is briefly described below.

The vehicle according to the present invention has the battery pack 1 according to any one of the embodiments described above, and since the vehicle according to the present invention includes the battery pack 1 according to any one of the embodiments described above, the battery pack 1 in the vehicle according to the present invention is light in weight, and the energy density in the battery pack 1 is greater.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the description of the invention, a "first feature" or "second feature" may include one or more of such features.

In the description of the present invention, "plurality" means two or more.

In the description of the invention, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the invention, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

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

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (12)

1. A battery pack, comprising:

A bottom plate;

The frame is arranged around the periphery of the bottom plate and defines a battery cell accommodating cavity with the bottom plate;

The separation beams are arranged on the bottom plate and positioned in the battery cell accommodating cavity, the separation beams are configured to extend in the first direction and at least one of the separation beams is spaced in the second direction, and a mounting cavity is defined between two adjacent separation beams or is defined by the separation beams and the frame edge;

The battery cell groups are accommodated in the mounting cavity and are configured into a plurality of groups which are sequentially arranged in the first direction; wherein the method comprises the steps of

Each cell group is provided with a plurality of cell monomers, and the plurality of cell monomers extend in the second direction and are sequentially distributed along the first direction; and/or a plurality of the battery cell monomers extend in the first direction and are sequentially arranged along the second direction.

2. The battery pack according to claim 1, wherein both ends of the partition beams extend to be connected to the frame, and surfaces of two adjacent partition beams facing each other are respectively formed with a first limit surface and a second limit surface, the first limit surface and the second limit surface being disposed opposite to each other in a second direction; wherein the method comprises the steps of

The two ends of the plurality of battery cell groups are respectively abutted against the first limiting surface and the second limiting surface, and two adjacent battery cell groups in the first direction are arranged at intervals.

3. The battery pack of claim 2, wherein the cell stack comprises:

A first cell configured as a plurality of cells arranged in sequence in a second direction;

The second battery cells are configured into a plurality of second battery cells which are sequentially arranged in the second direction, and any one of the first battery cells and the second battery cells are correspondingly arranged in the first direction.

4. The battery pack of claim 3, further comprising:

the end plates are arranged at two ends of the battery cell group, supporting surfaces and matching surfaces are respectively formed on two sides of the end plates in the thickness direction, the supporting surfaces are suitable for being attached to the end surfaces of the battery cell group, and the matching surfaces are suitable for being attached to the separation beams; wherein the method comprises the steps of

The bottom of the end plate forms a guide surface which is arranged obliquely in a direction towards the bottom towards the support surface.

5. The battery pack of claim 4, wherein the mating surface has a detent formed thereon adapted to mate with a pawl.

6. The battery pack of claim 5, wherein the cell stack further comprises:

the heating film extends in the second direction, two sides of the heating film in the thickness direction are respectively attached to the first electric core and the second electric core, and two ends of the heating film are respectively fixed with the end plates positioned at two ends of the electric core group.

7. The battery pack of claim 6, wherein the heating film comprises:

The first heating piece is attached to the first electric core and is suitable for heating the first electric core;

The second heating piece is attached to the second electric core and is suitable for heating the second electric core;

the heat insulation piece is arranged between the first heating piece and the second heating piece.

8. The battery pack according to claim 7, wherein a first gap is formed between two adjacent first cells, and a second gap is formed between two adjacent second cells; the heating film assembly is provided with an avoidance hole penetrating in the first direction, one end of the avoidance hole is opposite to the first gap, and the other end of the avoidance hole is opposite to the second gap.

9. The battery pack of claim 1, further comprising: the buffer piece is arranged between two adjacent battery cell monomers.

10. The battery pack according to claim 9, wherein the surfaces of the adjacent two battery cells facing each other are formed with a large battery cell surface, and the buffer member is provided around at least part of the outer periphery of the large battery cell surface.

11. The battery pack according to claim 1, wherein a plurality of connection regions are formed on the bottom plate, the connection regions extending between adjacent two of the partition beams, the plurality of connection regions being spaced apart in the first direction; wherein the method comprises the steps of

The battery pack further includes: the adhesive layers are respectively arranged in the corresponding connecting areas and are suitable for connecting the battery cell group with the bottom plate.

12. A vehicle comprising a battery pack according to any one of claims 1-11.