CN115803948A

CN115803948A - Battery module and vehicle

Info

Publication number: CN115803948A
Application number: CN202080101362.3A
Authority: CN
Inventors: 王安; 于林; 占莉
Original assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Weirui Electric Automobile Technology Ningbo Co Ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2023-03-14
Also published as: WO2022011513A1

Abstract

The invention provides a battery module, which comprises a battery cell unit and a module frame structure, wherein the battery cell unit is arranged in the module frame structure; the module frame structure comprises a first end plate, a second end plate, a front cover plate, a rear cover plate and at least one middle reinforcing plate, wherein the first end plate, the front cover plate, the second end plate and the rear cover plate enclose an accommodating space, and the middle reinforcing plate is connected with the first end plate and the second end plate to divide the accommodating space into accommodating cavities distributed in rows; the battery cell unit is correspondingly arranged in the containing cavity and comprises at least two single batteries which are arranged from the first end plate to the second end plate, the lugs of the single batteries in each battery cell unit face the same direction, and the lugs of the single batteries face the front cover plate or the rear cover plate; this application has set up module frame construction for the electric core unit of putting of side, and the size that can make full use of side put electric core matches the battery package inner space, consequently need not redevelopment electric core unit, is favorable to reducing battery module cost.

Description

Battery module and vehicle

Technical Field

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

Background

Driven by national policies and markets, electric vehicles are rapidly developing, and thus, the demand for power batteries is more and more vigorous. How to place more battery cores in a limited space to improve the energy density of the whole pack, so as to improve the endurance mileage is more and more concerned by people.

In the prior art of battery packs, a battery core is a core component of the battery pack. The battery core is placed in various ways, for example: separately arranged or designed as a module and then secured within the battery pack. In order to match the space of the power battery pack of vehicles of different models, the battery core needs to be selected into different sizes or specifications to meet the space requirement in the pack, so that the specification of the battery pack is repeatedly developed, and high development cost is brought.

Generally, when the battery core is in the range of 20 ℃ to 40 ℃, the charge and discharge performance is optimal, and the service life of the battery core is also most beneficial. The heat generated by the battery core in the high-rate charging and discharging process is large, and if the heat is rapidly accumulated, local overheating or uneven temperature is caused, so that the performance of the battery is reduced, the capacity and the service life of the battery are reduced, and even the thermal runaway of the battery is caused. Therefore, in the prior art, a liquid cooling heat dissipation device is often used to perform heat dissipation treatment. However, the heat dissipation device needs to have a volume matched with the size of the battery cell to have better heat dissipation efficiency, and the volume of the battery pack is additionally increased. Under the condition of limited existing space, the size of the battery cell is compressed, and the contradiction between the concept of increasing the number of the battery cells to improve the energy density is not easy to reconcile. In addition, the battery cell expands during the charging and discharging cycle, so that a certain space needs to be reserved during the battery cell assembly. Otherwise, the mutual extrusion is caused by thermal expansion between the electric cores, or the electric cores cause the extrusion to the shell frame of the battery pack, so that the risks of damage of the electric cores, leakage of the conductive liquid in the electric cores and scattering of the shell frame are caused.

To the above-mentioned problem that prior art exists, this application aims at providing a battery module and vehicle, can coordinate to improve electric core energy density and provide the problem between arranging and the space of power supply core thermal expansion of cooling device to need not redevelopment electricity core, be favorable to reducing battery module cost.

Disclosure of Invention

In view of the above problems in the prior art, an object of the present invention is to provide a battery module, which includes a cell unit and a module frame structure, wherein the cell unit is disposed in the module frame structure;

the module frame structure comprises a first end plate, a second end plate, a front cover plate, a rear cover plate and at least one middle reinforcing plate, wherein the first end plate, the front cover plate, the second end plate and the rear cover plate are enclosed to form an accommodating space, each middle reinforcing plate is connected with the first end plate and the second end plate, and the accommodating space is divided into at least two accommodating cavities which are arranged in a row by the middle reinforcing plates;

each electricity core unit is correspondingly arranged in the containing cavity and comprises at least two single batteries which are arranged from a first end plate to a second end plate, the direction of the pole ear of each single battery in each electricity core unit is the same, and the pole ear of each single battery faces the front cover plate or the rear cover plate.

Further, the battery module further comprises a cooling structure, the cooling structure is arranged in the module frame structure, the cooling structure comprises a first cooling plate, and the first cooling plate is located between every two adjacent battery cell units.

Further, the tabs are arranged on the top surface of the single battery, the tabs comprise a positive tab and a negative tab, and the positive tab and the negative tab are arranged along the length direction of the top surface; every the battery cell still includes two binding faces, two the binding face respectively with two long limits of top surface are connected, adjacent two the battery cell passes through the binding face laminating is connected.

Specifically, the battery module further comprises a wire harness isolation unit, wherein the wire harness isolation unit is arranged between the battery cell unit and the front cover plate and/or between the battery cell unit and the rear cover plate and/or between the battery cell unit and the middle reinforcing plate, a flexible circuit board and a battery cell bus bar are integrated on the wire harness isolation unit, and the flexible circuit board is connected with the positive pole lug and the negative pole lug.

Preferably, the positive electrode tab and the negative electrode tab are respectively welded to the cell busbar, so that the cell unit is fixedly connected to the wire harness isolation unit. .

Furthermore, the wire harness isolation unit is provided with a positive through hole matched with the positive pole lug, and the positive through hole is used for the positive pole lug to pass through; and the wire harness isolation unit is also provided with a negative pole through hole matched with the negative pole lug, and the negative pole through hole is used for the negative pole lug to pass through.

Further, the battery pack further comprises an acquisition processor, wherein the acquisition processor is used for monitoring the battery cell unit, and the battery cell unit is connected with the acquisition processor through the flexible circuit board.

Specifically, the middle reinforcing plate is provided with a step structure, and the step structure is arranged at one end of the middle reinforcing plate close to the first end plate and one end of the middle reinforcing plate close to the second end plate; the first end plate with the second end plate all is equipped with the joint groove, the joint groove with the stair structure phase-match, the first end plate with middle reinforcing plate the second end plate with middle reinforcing plate all passes through the stair structure with the joint groove is connected.

Furthermore, one side of the first end plate close to the middle reinforcing plate and one side of the second end plate close to the middle reinforcing plate are both provided with a recessed structure, the recessed structures and the clamping grooves are arranged at intervals, and the recessed structures are opposite to the battery cell units.

Specifically, module frame construction still includes an upper fixed plate and a bottom plate, an upper fixed plate is located one side of electric core unit, four sides of an upper fixed plate respectively with first end plate, front shroud, second end plate and the back shroud is connected, a bottom plate is located electric core unit keeps away from one side of an upper fixed plate, four sides of a bottom plate respectively with first end plate, front shroud, second end plate with the back shroud is connected.

Furthermore, the upper fixing plate comprises an upper fixing plate body and first flanges, the first flanges are located on two sides of the upper fixing plate body, and the first flanges extend towards the lower fixing plate; the lower fixing plate comprises a lower fixing plate body and second flanges, the second flanges are located on two sides of the lower fixing plate body, and the second flanges extend towards the upper fixing plate.

Preferably, the surface of the upper fixing plate and the surface of the lower fixing plate are both provided with reinforcing ribs.

Specifically, the cooling structure further includes a second cooling plate and a third cooling plate, the second cooling plate is disposed between the electric core unit and the upper fixing plate, the third cooling plate is disposed between the electric core unit and the lower fixing plate, and the first cooling plate, the second cooling plate and the third cooling plate are communicated with each other through a cooling liquid circulation pipeline.

Preferably, glue is applied between the cell unit and the first cooling plate, between the cell unit and the second cooling plate, and between the cell unit and the third cooling plate, and glue is applied between the middle reinforcing plate and the first cooling plate, and between the middle reinforcing plate and the cell unit.

Specifically, still include the busbar, the busbar includes battery module busbar and electric core unit busbar, electric core unit busbar is used for with each electric core unit connects and forms a whole, battery module busbar is used for with each whole and positive negative pole seat that electric core unit links into are connected.

Preferably, the battery pack further comprises a buffer structure, and the buffer structure is arranged between two adjacent single batteries.

Another aspect of the present invention provides a vehicle including the battery module according to the above technical solution.

Due to the technical scheme, the invention has the following beneficial effects:

1) The invention provides a battery module, which is specially used for arranging a module frame structure for laterally-arranged battery cell units, wherein the middle reinforcing plate can improve the structural strength of the module frame structure and provides a containing cavity for arranging each battery cell unit, so that the battery cell units are not excessively attached, mutual extrusion caused by thermal expansion of the battery cell units is favorably avoided, and the short circuit risk between the battery cell units is favorably avoided.

2) The invention provides a battery module, which can be matched with the internal space of a battery pack by fully utilizing the size of a side discharge battery core without repeatedly developing the size of the battery core, and is beneficial to reducing the cost of the battery module.

3) The battery module with the laterally-arranged battery cell, provided by the invention, has the advantages that the cooling structure arranged on the basis of the module frame structure can be attached to the battery cell unit so as to improve the cooling effect on the battery cell unit, a proper working temperature environment is provided for the battery cell unit, and the local overheating or thermal runaway caused by huge heat generation of the battery module is avoided; a coordination is achieved between providing space for the arrangement of cooling devices, providing space for thermal expansion of the power core, and increasing the energy density of the battery pack.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is an exploded view of a battery module according to an embodiment of the present invention;

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

fig. 3 is a schematic structural view of the assembled battery module;

fig. 4 is a schematic view of the assembly of the battery module;

FIG. 5 is a schematic view of the structure of the unit cell according to the embodiment of the present invention;

FIG. 6 is a schematic structural view of the module frame structure;

FIG. 7 is a top view of the first/second end plate;

FIG. 8 is a schematic structural view of an upper fixing plate;

fig. 9 is a structural schematic diagram of the wire harness isolation unit.

In the figure: 10-cell unit, 101-single battery, 101 a-positive electrode tab, 101 b-negative electrode tab, 101 c-explosion-proof valve, 20-module frame structure, 21 a-first end plate, 21 b-second end plate, 211-clamping groove, 212-recessed structure, 213-first opening, 22-front cover plate, 23-rear cover plate, 24-middle reinforcing plate, 241-step structure, 25-upper fixing plate, 251-first flanging, 252-reinforcing rib, 253-second opening, 26-lower fixing plate, 261-second flanging, 30-cooling structure, 31-first cooling plate, 32-second cooling plate, 33-third cooling plate, 40-wiring harness isolation unit, 41-cell bus bar, 42-flexible circuit board, 50-bus bar, 51-battery module bus bar, 52-cell unit bus bar, 60-collection processor, 70-positive and negative electrode base, and 80-buffer structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. The terms "upper", "lower", "front" and "rear" are described at angles shown in the drawings, and are only for convenience of describing relative positional relationships among the components, and this of course also includes the definition of the relative positional relationships equivalent thereto when different reference directions are taken. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

Examples

With reference to fig. 1 to 9, the present embodiment provides a battery module, which includes a battery cell unit 10, a module frame structure 20, and a cooling structure 30, where the battery cell unit 10 and the cooling structure 30 are both disposed in the module frame structure 20;

the module frame structure 20 comprises a first end plate 21a, a second end plate 21b, a front cover plate 22, a rear cover plate 23 and at least one middle reinforcing plate 24, the first end plate 21a, the front cover plate 22, the second end plate 21b and the rear cover plate 23 enclose to form an accommodating space, two ends of the middle reinforcing plate 24 are respectively connected with the first end plate 21a and the second end plate 21b, and the accommodating space is divided into at least two accommodating cavities arranged in a row by the middle reinforcing plate 24; in the present embodiment, the first end plate 21a is disposed opposite to the second end plate 21b, and the front cover plate 22 is disposed opposite to the rear cover plate 23; preferably, the middle reinforcing plate 24 is uniformly distributed in the accommodating space to divide the accommodating space into two or more accommodating chambers relatively evenly;

each of the accommodating cavities is correspondingly provided with one of the battery cell units 10, that is, the number of the battery cell units 10 is equal to that of the accommodating cavities, each of the battery cell units 10 includes at least two single batteries 101 arranged from the first end plate 21a to the second end plate 21b, all of the single batteries 101 in the battery cell unit 10 have the same tab orientation, and the tabs of the single batteries 101 face the front cover plate 22 or the rear cover plate 23.

The cooling structure 30 includes a first cooling plate 31, and the first cooling plate 31 is located between two adjacent battery cell units 10.

In the battery module provided by the embodiment of the present specification, it is the same that the tab orientation of each battery cell 101 in the battery cell unit 10 is the same, thereby being favorable to series-parallel connection wiring between the battery cells, reducing the wiring difficulty and complexity, and being capable of playing a role in compact structure and saving space.

In the prior art, since the cell unit 10 generally has a larger size, that is, the cell unit 10 has a longer distance in the direction from the first end plate 21a to the second end plate 21b, the cooling plate generally needs to be designed with a larger size to meet the cooling requirement. However, when the length of the water cooling plate is long, a large gap is easily reserved between the middle section of the water cooling plate and the battery module due to the influence of gravity, and the water cooling plate cannot be tightly attached to the battery module, so that the cooling effect is reduced. If the water cooling plate is fixedly connected with the battery module through a fastener or a welding mode, the circulation of cooling liquid in the water cooling plate can be influenced.

In the embodiment of the present disclosure, since the first cooling plate 31 is disposed between two adjacent cell units 10, the first cooling plate 31 can be clamped between the two adjacent cell units to keep close contact with the battery unit, and thus, a cooling effect can be provided for the two cell units 10 at the same time.

As shown in fig. 5, which is a schematic structural diagram of the single battery 101, the single battery 101 includes a top surface, a bottom surface, two abutting surfaces and two abutting surfaces, the top surface is disposed opposite to the bottom surface, the top surface is rectangular, and the top surface includes two long sides disposed opposite to each other and two short sides disposed opposite to each other; the two binding surfaces are oppositely arranged and connected with the long edge of the top surface; the two abutting surfaces are oppositely arranged and connected with the short side of the top surface.

The pole lug is arranged on the top surface of the single battery 101 and comprises a positive pole lug 101a and a negative pole lug 101b, and the positive pole lug 101a and the negative pole lug 101b are arranged along the length direction of the top surface. The adjacent two single batteries 101 are attached and connected through the attachment surface, so that the single batteries 101 are arranged from the first end plate 21a to the second end plate 21b, and are stacked in the thickness direction of the single batteries 101.

As shown in fig. 5, an explosion-proof valve 101c is further disposed on the unit cell 101, and the explosion-proof valve 101c is disposed between the positive electrode tab 101a and the negative electrode tab 101 b.

The embodiment of the present specification provides a battery module, in which the unit cells in each battery unit 10 are laterally arranged (as shown in fig. 1 or 2), and the battery module can be adapted to a battery pack with a high height. For example: the height of the battery pack is basically equal to the length of the single batteries, and if the battery module is still arranged in a mode that the lugs of the single batteries face upwards, the waste of the battery pack in the height space can be caused, and the energy density of the battery pack is seriously adversely affected. At the moment, the battery pack height space is fully utilized by adopting a mode of laterally placing the single battery as provided by the application; multiple columns of battery cell units are arranged in the battery pack so as to fully utilize the length and width space of the battery pack, and the limited space in the battery pack is fully utilized.

The battery module provided by the embodiment of the present specification further includes a wire harness isolation unit 40, where the wire harness isolation unit 40 is disposed between the cell unit 10 and the front cover plate 22, and/or between the cell unit 10 and the rear cover plate 23, and/or between the cell unit 10 and the intermediate reinforcing plate 24.

The wire harness isolation unit 40 is integrated with a Flexible Circuit board (Flexible Printed Circuit) and a battery cell bus bar, and the Flexible Circuit board and the battery cell bus bar are respectively connected with a positive electrode tab 101a and a negative electrode tab 101b of each single battery 101 in a battery cell unit adjacent to the Flexible Circuit board and the battery cell bus bar, so that the low-voltage signal and the power connection of each single battery can be acquired. The wire harness isolation unit 40 can perform an insulating function, so as to prevent short circuit between the single batteries 101 in the battery cell unit 10. Preferably, in the battery module provided in the embodiment of the present specification, the number of the harness isolation units 40 is the same as the number of the battery cell units 10. When the number of the cell units 10 is greater than two, the tab of one cell unit 10 necessarily faces the middle reinforcing plate 24, and therefore the wire harness isolation unit 40 is disposed between the middle reinforcing plate 24 and the cell unit 10.

Be equipped with on the pencil isolation unit 40 with anodal utmost point ear 101a assorted anodal through-hole, anodal through-hole is used for supplying anodal utmost point ear passes, here, anodal through-hole with anodal utmost point ear 101a phase-match indicates: the shape and size of the positive through holes are matched with those of the positive pole lugs 101a, the number of the positive through holes is matched with that of each single battery in the battery cell unit 10, and the positions of the positive through holes arranged on the wire harness isolation unit 40 are matched with those of the positive pole lugs 101a relative to the battery cell unit 10. Similarly, the wire harness isolation unit 40 is further provided with a negative electrode through hole matched with the negative electrode tab 101b, and the negative electrode through hole is used for the negative electrode tab 101b to pass through.

Further, an explosion-proof valve through hole is further formed in the wire harness isolation unit 40, and the explosion-proof valve through hole is used for allowing the explosion-proof valve 101c to penetrate through.

Through the positive through hole, the negative through hole and the explosion-proof valve through hole, the wiring harness isolation unit 40 and the electric core unit 10 are welded and fixed with electric core unit tabs through an electric core busbar 41, and after the fixing, the positive tab 101a and the negative tab 101b of each single battery in the electric core unit 10 extend out and are electrically connected with a flexible circuit board integrated on the wiring harness isolation unit 40; the flexible circuit board is electrically connected with the lugs of the single batteries, so that the number of wire bundles in the package is reduced, and the highly integrated design of a large module is realized.

Preferably, in the embodiment of the present disclosure, the side surface of the wire harness isolation unit 40 close to the battery cell unit 10 is fixed by welding a battery cell bus bar to a battery cell tab, so that the wire harness isolation unit 40 is stably connected to the battery cell unit 10, thereby ensuring the stability of the connection of the wiring line.

The battery module provided by the embodiment of the present specification further includes an acquisition processor 60, the acquisition processor 60 is connected to each of the battery cell units 10 through the flexible circuit board, so that the acquisition processor 60 can be connected to the positive electrode tab 101a and the negative electrode tab 101b of each battery cell 101, so as to monitor the output voltage, the current, the battery temperature and other indexes of each battery cell unit 10, and provide information about the battery efficiency and the use state of the battery management unit, so that the battery module can be maintained, repaired or replaced in time when the state of the battery module is monitored to be not good enough.

As shown in fig. 6, in the embodiment of the present specification, the middle reinforcing plate 24 is provided with a step structure 241, and the step structure 241 is arranged at one end of the middle reinforcing plate 24 close to the first end plate 21a and one end close to the second end plate 21 b; first end plate 21a with second end plate 21b all is equipped with joint groove 211, joint groove 211 with stair structure 241 phase-match, first end plate 21a, second end plate 21b with middle reinforcing plate 24 passes through stair structure 241 with joint groove 211 is connected. Here, the matching of the snap groove 211 and the step structure 241 means: the slotting depth, slotting width and slotting length of the clamping groove 211 are matched with the three-dimensional size of the step structure 241; the number of the clamping grooves 211 is matched with that of the middle reinforcing plates 24; besides, the opening position of the clamping groove 211 on the first end plate 21a (or the second end plate 21 b) corresponds to the position of the middle reinforcing plate 24 in the accommodating space.

Preferably, in this embodiment, after the step structure 24 and the clamping groove 211 are used to realize the plug connection between the middle reinforcing plate 24 and the first end plate 21a and the second end plate 21b, the step structure 24 and the first end plate 21a and the second end plate 21b are further connected into a whole in a welding manner, so that the module frame structure 20 is stably connected.

It should be noted that, the depth of the snap-in groove 211 matches with the step structure 241, and the snap-in groove 211 may be a through groove formed inside the first end plate 21a (inside the second end plate 21 b), or may penetrate through the first end plate 21a (inside the second end plate 21 b).

As shown in fig. 7, recessed structures 212 are disposed on both sides of the first end plate 21a close to the middle reinforcing plate 24 and the second end plate 21b close to the middle reinforcing plate 24, the recessed structures 212 and the clamping grooves 211 are disposed at intervals, and the recessed structures 212 are opposite to the battery cell unit 10. Since the cell unit 10 expands during charge and discharge cycles, the recessed structure 212 can reserve a space for thermal expansion of the cell unit 10.

In the battery module provided in the embodiment of the present specification, the module frame structure 20 further includes an upper fixing plate 25 and a lower fixing plate 26, as shown in fig. 1 to fig. 3 and fig. 6, the upper fixing plate 25 is located on one side of the electrical core unit 10, four side edges of the upper fixing plate 25 are connected to the first end plate 21a, the front cover plate 22, the second end plate 21b and the rear cover plate 23, the lower fixing plate 26 is located on one side of the electrical core unit 10 away from the upper fixing plate 25, and four side edges of the lower fixing plate 26 are respectively connected to the first end plate 21a, the front cover plate 22, the second end plate 21b and the rear cover plate 23. That is, the upper fixing plate 25 and the lower fixing plate 26 are respectively attached to two adjacent surfaces of each unit cell 101.

The upper fixing plate 25 includes an upper fixing plate body and first flanges 251, the first flanges 251 are located at two sides of the upper fixing plate body, the first flanges 251 extend in the direction of the lower fixing plate 26, and the first flanges 251 are used for connecting the first end plate 21a and the second end plate 21 b; the lower fixing plate 26 includes a fixing plate body and a second flange 261, the second flange 261 is located at two sides of the lower fixing plate body, the second flange 261 extends towards the upper fixing plate 25, and the second flange 261 is used for connecting the first end plate 21a and the second end plate 21 b; the first turned-over edge 251 and the second turned-over edge 261 can improve the structural strength of the upper fixing plate 25 and the lower fixing plate 26, respectively, and can also improve the connection strength of the module frame structure 20.

In the embodiment of the present disclosure, a reinforcing rib 252 is further disposed on a surface of the upper fixing plate 25 to improve the structural strength of the upper fixing plate 25.

In the embodiment of the present disclosure, in the battery cell unit 10, a top surface of each unit battery 101 faces the front cover plate 22 or the rear cover plate 23, an adjacent surface of each unit battery 101 faces the upper fixing plate 24 or the lower fixing plate 26, each unit battery 101 faces the first end plate 21a or the second end plate 21b, and bonding surfaces of two adjacent unit batteries 101 are bonded to each other.

Preferably, the arrangement directions of the positive electrode tabs and the negative electrode tabs of the single batteries 101 in the battery cell unit 10 are the same, for example, in the same battery cell unit 10, the positive electrode tabs 101a of the single batteries 101 are arranged close to the upper fixing plate 25, and the negative electrode tabs 101b of the single batteries 101 are arranged close to the lower fixing plate 26, so that the serial-parallel connection and the flat-line connection after being stacked and arranged in the module frame structure are facilitated. Of course, the orientations of the positive electrode tab 101a and the negative electrode tab 101b may be opposite to the above directions, and the orientations of the tabs in different cell units 10 may be different.

In some embodiments, the cooling structure 30 may further include a second cooling plate 32 and a third cooling plate 33, the second cooling plate 32 is disposed between the cell unit 10 and the upper fixing plate 25, and the third cooling plate 33 is disposed between the cell unit 10 and the lower fixing plate 26. It should be noted that the second cooling plate 32 and the third cooling plate 33 are large enough to be in sufficient contact with the respective cell units 10 to achieve temperature adjustment of the cell units 10.

The first cooling plate 31, the second cooling plate 32 and the third cooling plate 33 are communicated with each other through a cooling liquid circulation duct.

In the embodiment of the present specification, the second cooling plate 32 is disposed between the cell units 10 and the upper fixing plate 25, so that the second cooling plate 32 can be attached to the adjacent surface of the unit battery in each cell unit 10 under the action of its own weight; the third cooling plate 33 is disposed between the cell units 10 and the lower fixing plate 26, and the lower fixing plate 26 can support the third cooling plate 33 and attach the third cooling plate 33 to another adjacent surface of the unit battery in each cell unit 10; and the first cooling plate 31 is disposed between the adjacent cell units 10, that is, the first cooling plate 31 is attached to the bottom surface of each unit battery 101 in the cell unit, or is attached to the bottom surface of each unit battery through the intermediate reinforcing plate 24, so that each unit battery 101 can receive the cooling effect of the cooling structure 30 from the bottom surface and two adjacent surfaces, and the temperature management efficiency of the cell units 10 is improved.

In order to further enhance the efficiency of the cooling structure 30 in managing the temperature of each cell unit 10, glue is applied between the cell unit 10 and the first cooling plate 31, and glue is also applied between the cell unit 10 and the second cooling plate 32 and between the cell unit 10 and the third cooling plate 33. Since an intermediate reinforcing plate 24 may be further disposed between the cell unit 10 and the first cooling plate 31, a glue coating process is performed between the cell unit 10 and the intermediate reinforcing plate 24, and between the intermediate reinforcing plate 24 and the first cooling plate 31.

The battery module provided by the embodiment of the present specification further includes a busbar 50, where the busbar 50 includes a battery module busbar 51 and a cell unit busbar 52, the cell unit busbar 52 is used to connect each cell unit and form a whole, and the battery module busbar 51 is used to connect the whole formed by each cell unit 10 and a positive and negative electrode holder 70.

Specifically, the individual batteries 101 in the cell units 10 are connected in series and parallel by the flexible circuit board integrated in the wire harness isolation unit 40, and each cell unit 10 finally outputs one positive electrode and one negative electrode. The cell unit busbar 52 connects the cell units 10 to finally realize that the battery module is output as a positive electrode and a negative electrode. The battery module bus bar 51 includes a battery module positive bus bar and a battery module negative bus bar, which respectively draw out the positive and negative electrodes output by the battery modules, so as to realize series-parallel connection between a plurality of battery modules. For example: one end of the cell unit busbar 52 is connected to the positive electrode of the first cell unit 10, and the other end of the cell unit busbar 52 is connected to the negative electrode of the second cell unit 10; one end of the positive busbar of the battery module is connected with the negative electrode of the first cell unit 10, and the other end of the positive busbar is connected with the positive terminal of the positive and negative electrode holder 70; one end of the battery module negative bus bar is connected with the positive electrode of the second cell unit 10, and the other end of the battery module negative bus bar is connected with the negative electrode terminal of the positive and negative electrode holder 70; that is, it is realized that there will be two cell units 10, and the two cell units 10 are connected in series. For a battery module having 3 or more than 3 battery cell units 10, the battery cell units 10 may be connected in series or in parallel with each other by 2 or more than 2 battery cell unit busbars 52.

As shown in fig. 4, in the present embodiment, the positive and negative electrode holders 70 are disposed on a side of the upper fixing plate 25 close to the first end plate 21 a.

Specifically, as shown in fig. 7, the positive and negative electrode holder 70 includes a supporting plate and a locking plate, the supporting plate is connected to the locking plate through a connecting member, the supporting plate is provided with a positive electrode slot and a negative electrode slot, the positive electrode slot is used for being connected to the positive electrode bus bar of the battery module, and the negative electrode slot is used for being connected to the negative electrode bus bar of the battery module. First end plate 21a is close to one side of upper fixed plate 25 is equipped with first trompil 213, upper fixed plate 25 is close to the one end of first end plate 21a is equipped with second trompil 253, second trompil 253 with first trompil 213 phase-match, battery module anodal busbar with the one end that the anodal groove links to each other is equipped with the third trompil, and the connecting piece passes in proper order the trompil, the anodal groove department of third trompil, second trompil and first trompil will battery module anodal busbar, layer board, upper fixed plate 25 with first end plate 21a is firm to be connected, the one end centre gripping of battery module anodal busbar forms the positive terminal of positive and negative pole seat 70 between layer board anodal groove and locking plate. The battery module negative pole busbar with the one end that the negative pole groove links to each other is equipped with the fourth trompil, and the connecting piece passes in proper order the trompil of fourth trompil, negative pole groove department, second trompil 253 and first trompil 213 will battery module negative pole busbar, layer board, upper fixed plate 25 with first end plate 21a is firm to be connected, the one end centre gripping of battery module negative pole busbar forms the negative pole terminal of positive and negative pole seat 70 between layer board anodal groove and locking plate. The positive and negative electrode holders 70 are stably connected to the module frame structure 20, and a plurality of battery modules are connected in series and parallel through the respective positive and negative electrode holders 70. Of course, in the embodiment of the present disclosure, the connection manner and the relative position relationship between the positive and negative electrode holders 70 and the module frame structure are only exemplary, and the positive and negative electrode holders 70 may also be connected in other manners, for example, the positive and negative electrode holders 70 are disposed at one end of the upper fixing plate 25 close to the second end plate 21b, or the positive and negative electrode holders 70 are disposed at one side of the first end plate 21a away from the middle reinforcing plate 24.

The first end plate 21a is close to one side of the lower fixing plate 26 and the second end plate 21b is close to one side of the lower fixing plate 26, and a connecting structure is further arranged and used for achieving assembly of the battery module.

In the embodiment of this specification, the battery module further includes buffer structure 80, buffer structure 80 sets up two adjacent between the battery cell 101, buffer structure 80 is used for playing the cushioning effect to the thermal expansion of the production of electricity core unit 10 charge-discharge cycle in-process, avoids the battery damage that each battery cell extrudes each other and causes in the thermal expansion, is favorable to improving battery life.

It should be noted that the buffer structure 80 may be disposed at an interval from the single battery 101; it is also possible to arrange as shown in fig. 1, with every two cells 101 forming a pair, with the cushioning structure 80 located between the pair of cells. Moreover, in order to show the arrangement position of the buffer structure 80, each buffer structure 80 in fig. 1 protrudes from the single battery 101, and in actual use, in order to achieve good contact between the single battery and the second cooling plate 32 and between the single battery and the third cooling plate 33, the buffer structure 80 is flush with the adjacent surface of each single battery 101.

The embodiment of the specification also provides a vehicle comprising the battery module according to the technical method.

The battery module provided by the embodiment of the specification is specially provided with a module frame structure for a side-placed (that is, a tab of a battery cell unit is placed not upwards or not downwards), wherein a middle reinforcing plate not only can improve the structural strength of the module frame structure, but also provides a cavity for arranging the power supply cell unit, so that the battery cell units are not excessively attached to each other, and mutual extrusion caused by thermal expansion of the battery cell units is avoided; and the cooling structure who arranges on this module frame construction's basis can provide the effectual cooling refrigeration effect of electric core unit, has improved the energy density of battery package when having realized providing cooling device arrangement space, supplying power core thermal expansion space. And, need not repeated development electric core, be favorable to reducing battery module cost.

In the embodiment of the present disclosure, the buffer structure 80 and the concave structure 212 are combined to provide a sufficient thermal expansion space for the battery cell unit 80; the battery module is also provided with a cooling structure for providing a cooling effect for each single battery in the battery cell unit so as to provide a proper working temperature environment for the battery module and avoid local overheating or thermal runaway caused by huge heat generation of the battery module; thereby avoided because the mutual extrusion of battery cell thermal energy causes battery cell damage, battery cell internal conductive liquid seepage risk, and avoided the extrusion that electric core unit thermal energy caused the module frame construction, avoided the risk that module frame construction looses the frame, be favorable to prolonging battery module life.

While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

A battery module, comprising a cell unit (10) and a module frame structure (20), wherein the cell unit (10) is disposed within the module frame structure (20);

the module frame structure (20) comprises a first end plate (21 a), a second end plate (21 b), a front cover plate (22), a rear cover plate (23) and at least one middle reinforcing plate (24), the first end plate (21 a), the front cover plate (22), the second end plate (21 b) and the rear cover plate (23) are enclosed to form an accommodating space, each middle reinforcing plate (24) is connected with the first end plate (21 a) and the second end plate (21 b), and the accommodating space is divided into at least two accommodating cavities which are arranged in a row by the middle reinforcing plate (24);

each electricity core unit (10) is correspondingly arranged in the containing cavity, each electricity core unit (10) comprises at least two single batteries (101) which are arranged from a first end plate (21 a) to a second end plate (21 b), the polar ear orientation of all the single batteries (101) in each electricity core unit (10) is the same, and the polar ear orientation of the single batteries (101) is the front cover plate (22) or the rear cover plate (23).
The battery module according to claim 1, further comprising a cooling structure (30), wherein the cooling structure (30) is disposed in the module frame structure (20), and the cooling structure (30) comprises a first cooling plate (31), and the first cooling plate (31) is located between two adjacent cell units (10).
The battery module according to claim 2, wherein the tabs are arranged on the top surface of the single battery (101), and the tabs comprise a positive tab (101 a) and a negative tab (101 b), and the positive tab (101 a) and the negative tab (101 b) are arranged along the length direction of the top surface; every battery cell (101) still includes two binding faces, two the binding face respectively with two long limits of top surface are connected, adjacent two battery cell (101) pass through binding face laminating is connected.
The battery module according to claim 3, further comprising a harness isolation unit (40), wherein the harness isolation unit (40) is disposed between the cell unit (10) and the front cover plate (22) and/or between the cell unit (10) and the rear cover plate (23) and/or between the cell unit (10) and the middle reinforcing plate (24), a flexible circuit board (42) is integrated on the harness isolation unit (40), and the flexible circuit board (42) is connected with the positive electrode tab and the negative electrode tab.
The battery module according to claim 4, wherein a cell busbar (41) is further integrated on the harness isolation unit (40), and the positive electrode tab and the negative electrode tab are respectively welded to the cell busbar (41) so that the cell unit (10) is fixedly connected to the harness isolation unit (40).
The battery module according to claim 4, wherein the harness isolation unit (40) is provided with a positive through hole matched with the positive tab (101 a), and the positive through hole is used for the positive tab (101 a) to pass through; the wire harness isolation unit (40) is further provided with a negative pole through hole matched with the negative pole lug (101 b), and the negative pole through hole is used for allowing the negative pole lug (101 b) to penetrate through.
The battery module according to claim 4, further comprising an acquisition processor (60), wherein the acquisition processor (60) is used for monitoring the cell unit (10), and the cell unit (10) and the acquisition processor (60) are connected through the flexible circuit board.
A battery module according to claim 1, wherein the intermediate reinforcing plate (24) is provided with a step structure (241), the step structure (241) being provided at one end of the intermediate reinforcing plate (24) near the first end plate (21 a) and at one end near the second end plate (21 b); first end plate (21 a) with second end plate (21 b) all is equipped with joint groove (211), joint groove (211) with stair structure (241) phase-match, first end plate (21 a) with middle reinforcing plate (24) second end plate (21 b) with middle reinforcing plate (24) all passes through stair structure (241) with joint groove (211) is connected.
The battery module according to any one of claims 8, wherein a side of the first end plate (21 a) close to the middle reinforcing plate (24) and a side of the second end plate (21 b) close to the middle reinforcing plate (24) are provided with a recessed structure (212), the recessed structure (212) is spaced from the clamping groove (211), and the recessed structure (212) is opposite to the battery cell unit (10).
The battery module according to claim 2, wherein the module frame structure (20) further comprises an upper fixing plate (25) and a lower fixing plate (26), the upper fixing plate (25) is located on one side of the cell unit (10), four sides of the upper fixing plate (25) are respectively connected with the first end plate (21 a), the front cover plate (22), the second end plate (21 b) and the rear cover plate (23), the lower fixing plate (26) is located on one side of the cell unit (10) away from the upper fixing plate (25), and four sides of the lower fixing plate (26) are respectively connected with the first end plate (21 a), the front cover plate (22), the second end plate (21 b) and the rear cover plate (23).
The battery module according to claim 10, wherein the upper fixing plate (25) comprises an upper fixing plate body and first flanges (251), the first flanges (251) are located on two sides of the upper fixing plate body, and the first flanges (251) extend in the direction of the lower fixing plate (26); the lower fixing plate (26) comprises a lower fixing plate body and second flanging (261), the second flanging (261) is located on two sides of the lower fixing plate body, and the second flanging (261) extends towards the upper fixing plate (25).
The battery module according to claim 10, wherein the surface of the upper fixing plate (25) is provided with a reinforcing rib (252).
The battery module according to claim 10, wherein the cooling structure (30) further comprises a second cooling plate (32) and a third cooling plate (33), the second cooling plate (32) is disposed between the cell unit (10) and the upper fixing plate (25), the third cooling plate (33) is disposed between the cell unit (10) and the lower fixing plate (26), and the first cooling plate (31), the second cooling plate (32) and the third cooling plate (33) are communicated with each other through a cooling liquid circulation duct.
The battery module according to claim 13, wherein glue is applied between the cell unit (10) and the first cooling plate (31), between the cell unit (10) and the second cooling plate (32), and between the cell unit (10) and the third cooling plate (33), and glue is applied between the intermediate reinforcing plate (24) and the first cooling plate (31) and between the intermediate reinforcing plate (24) and the cell unit (10).
The battery module according to claim 13, further comprising a bus bar (50), wherein the bus bar (50) comprises a battery module bus bar (51) and a cell unit bus bar (52), the cell unit bus bar (52) is used for connecting the cell units (10) into a whole, and the battery module bus bar (51) is used for connecting the whole formed by the cell units with the positive and negative electrode holders (70).
The battery module according to claim 2, further comprising a buffer structure (80), wherein the buffer structure (80) is disposed between two adjacent single batteries (101).
A vehicle characterized by comprising the battery module according to any one of claims 1 to 16.