CN212874628U

CN212874628U - Battery module and power battery

Info

Publication number: CN212874628U
Application number: CN202021308193.4U
Authority: CN
Inventors: 戴亨伟; 张立鹏; 徐卫东; 王翠; 何庆庆; 杨伟; 张耀
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2021-04-02
Anticipated expiration: 2030-07-06

Abstract

The application discloses a battery module and a power battery, wherein the battery module comprises a plurality of battery cell assemblies and a shell, the shell is provided with a plurality of grids, and the plurality of battery cell assemblies are respectively inserted into the shell; the cell assembly comprises a cell, a first electrode assembly and a second electrode assembly, the first electrode assembly is electrically connected with one end of the cell, the second electrode assembly is electrically connected with the opposite end of the cell, the first electrode assembly, the cell and the second electrode assembly are integrally inserted into the grid, the first electrode assembly covers one end of the grid, and the second electrode assembly covers the opposite end of the grid.

Description

Battery module and power battery

Technical Field

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

Background

With the vigorous development of the new energy industry and the further popularization of new energy electric vehicles, the acceptance of people on new energy passenger vehicles is gradually improved. To power electricity core manufacturer, how to further promote the volume space utilization of power electricity core module, in limited lambkin car space, promote the load electric quantity, satisfy long duration requirement to can adopt the system scheme of low-cost high reliability, undoubtedly be the most crucial technical difficulty.

At present, mainstream battery core manufacturers mainly adopt a plurality of independent single batteries in a group mode, the volume space utilization rate of the group mode is low, and the internal space of a passenger vehicle battery pack is difficult to efficiently utilize.

In view of the above, it is desirable to develop a power battery with high energy density.

Content of application

The utility model aims at providing a battery module and power battery are in order to solve electric automobile's continuation of journey problem.

In order to achieve the purpose, the application adopts the following technical scheme: the battery module comprises a plurality of battery core assemblies and a shell, wherein the shell is provided with a plurality of grids, and the battery core assemblies are respectively inserted into the shell; the cell assembly comprises a cell, a first electrode assembly and a second electrode assembly, the first electrode assembly is electrically connected with one end of the cell, the second electrode assembly is electrically connected with the opposite end of the cell, the first electrode assembly, the cell and the second electrode assembly are integrally inserted into the grid, the first electrode assembly covers one end of the grid, and the second electrode assembly covers the opposite end of the grid.

Furthermore, the shell comprises a peripheral wall and a plurality of partition walls, the peripheral wall encloses to form a cavity, and the plurality of partition walls are arranged in the cavity at intervals to form a plurality of grids in a partitioned mode.

Further, the grids comprise a first grid and a second grid which are arranged at intervals, and the battery cell is contained in the first grid.

Further, the casing still includes a plurality of end walls, and a plurality of end walls cover the one end of a plurality of grids respectively, and the through-hole has been seted up to the end wall, and during first electrode subassembly, electric core and the whole grid that inserts of second electrode subassembly, first electrode subassembly and end wall were connected and further wear to establish the through-hole, and the second electrode subassembly covers the one end of keeping away from the end wall of grid.

Further, a plurality of end walls are arranged at two opposite ends of the peripheral wall, and the end walls arranged at the same end of the peripheral wall are arranged at intervals of one grid.

Furthermore, the first electrode assembly comprises a first end cover, a first connecting sheet and a first pole, the first end cover is connected with the end wall and covers the end wall to form a through hole, the first connecting sheet is electrically connected with one end of the battery core, and the first pole is electrically connected with the first connecting sheet and penetrates through the first end cover.

Further, electric core is full utmost point ear structure, and first connection piece includes first fixed part, second fixed part and main part, and the relative both ends of main part are provided with first fixed part and second fixed part respectively in order constituting U type structure, first fixed part and second fixed part respectively with the full utmost point ear structure electric connection of electric core, the main part is worn to establish by first utmost point post.

Further, electric core is cross cutting utmost point ear structure, and first connection piece includes first fixed part, second fixed part and main part, and the relative both ends of main part are provided with respectively with the range upon range of first fixed part and the second fixed part that sets up of main part, first fixed part and second fixed part respectively with the cross cutting utmost point ear structure electric connection of electric core, first utmost point post wears to establish the main part.

Further, the battery module still includes a plurality of plugs, offers on the perisporium to be used for annotating a plurality of notes liquid holes of electrolyte into a plurality of grids, and a plurality of plugs interference fit are one by one in annotating the liquid hole.

In order to solve the technical problem, the present application further provides a power battery, which includes an outer casing and a plurality of battery modules of any one of the above, wherein the plurality of battery modules are arranged side by side in the outer casing, and a first electrode assembly and a second electrode assembly of each battery module face to a thickness area of the outer casing.

The beneficial effects of the embodiment of the application are as follows: the battery module of this application includes a plurality of electric core subassemblies and casing, and a plurality of grids have been seted up to the casing, and a plurality of electric core subassemblies are inserted respectively to the casing in, and a plurality of electric core subassemblies form battery module through the casing is integrated together to save auxiliary component and occupy too much space, improve power battery's energy density.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or earlier developments of the present application, the drawings used in the embodiments or earlier developments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a power cell provided herein;

fig. 2 is an exploded schematic view of a battery module provided in the present application;

FIG. 3 is an exploded schematic view of an electrical core assembly provided herein;

FIG. 4 is a cross-sectional structural schematic view of a housing provided herein;

FIG. 5 is a schematic view of a portion of the area A in FIG. 4 according to the present application;

fig. 6 is a schematic cross-sectional view of a battery module provided herein;

FIG. 7 is an enlarged partial schematic view of region B of FIG. 6 as provided herein;

FIG. 8 is an exploded view of the first electrode assembly provided herein;

FIG. 9 is an exploded view of a second electrode assembly provided herein;

FIG. 10 is an exploded view of another embodiment of an electrical core assembly as provided herein.

The graphical notation is as follows:

power battery 100 outer casing 20 battery module 10 electric core assembly 11

Battery cell 112 full tab structure 1124 die-cutting tab structure 1126

First electrode assembly 114, second electrode assembly 116, first end cap 1141

First connecting plate 1143, first pole 1145 and first plastic pad 1147

First insulating ring 1149 second end cap 1161 second connecting plate 1163

A second pole 1165, a second plastic pad 1167, and a second insulating ring 1169

First fixing part 1142 and second fixing part 1144 main body part 1146

Peripheral wall 122 of grid 121 of housing 12 spacer 124

End wall 126 first grid 123 second grid 125 plug 13

Detailed Description

The descriptions in this application referring to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated.

The description in the present application relating to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a power battery 100 provided in the present application.

The power battery 100 of the present application is mounted on a chassis of an electric vehicle as an energy storage member. The power battery 100 includes an outer case 20 and a plurality of battery modules 10, the plurality of battery modules 10 are arranged side by side in the outer case 20, and a first electrode assembly 114 and a second electrode assembly 116 of the battery modules 10 face a thickness region of the outer case 20, that is, a height region of both ends of the battery modules 10 facing the bottom chassis.

Referring to fig. 1 to 3, fig. 2 is an exploded view of a battery module 10 provided in the present application, and fig. 3 is an exploded view of an electric core assembly 11 provided in the present application.

The battery module 10 of the present application includes: a plurality of grids 121 have been seted up to a plurality of electric core subassemblies 11 and casing 12, and a plurality of electric core subassemblies 11 are inserted respectively to in casing 12, and a plurality of electric core subassemblies 11 form battery module 10 through casing 12 is integrated together to save the auxiliary component and occupy too much space, improve power battery 100's energy density.

The battery assembly 11 includes a battery cell 112, a first electrode assembly 114 and a second electrode assembly 116, where the first electrode assembly 114 is electrically connected to one end of the battery cell 112, the second electrode assembly 116 is electrically connected to an opposite end of the battery cell 112, and the first electrode assembly 114 and the second electrode assembly 116 are positive and negative electrodes respectively for guiding out an electric quantity in the battery cell 112.

The housing 12 includes a peripheral wall 122 and a plurality of partition walls 124, the peripheral wall 122 encloses a cavity, the cavity is double-pass, the plurality of partition walls 124 are arranged in the cavity at intervals to form a plurality of grids 121, and the peripheral wall 122 and the partition walls 124 may be integrally formed or may be welded. The first electrode assembly 114, the cell 112, and the second electrode assembly 116 are assembled outside the case 12, the first electrode assembly 114, the cell 112, and the second electrode assembly 116 are integrally inserted into the grid 121, the cell 112 is accommodated in the grid 121, the first electrode assembly 114 covers one end of the grid 121, and the second electrode assembly 116 covers the opposite end of the grid 121.

Referring to fig. 1 to 5, fig. 4 is a schematic cross-sectional structure view of a housing 12 provided in the present application, and fig. 5 is a schematic partial enlarged structure view of a region a in fig. 4 provided in the present application.

The grid 121 includes a first grid 123 and a second grid 125 spaced apart from each other, the cell 112 is accommodated in the first grid 123, and the second grid 125 is used for providing a buffer space during the deformation and expansion of the first grid 123. Of course, the second grid 125 may also be installed with a heat conductive silicone to accelerate heat dissipation. In addition, the second grid 125 may also function to space the ends of the core assembly 11, preventing the ends of adjacent core assemblies 11 from generating assembly interference due to machining accuracy problems.

Referring to fig. 1 to 3, the case 12 further includes a plurality of end walls 126, the end walls 126 respectively cover and seal one ends of the grids 121, the end walls 126 are provided with through holes, one ends of the grids 121 far from the end walls 126, the first electrode assembly 114, the battery cell 112 and the second electrode assembly 116 are integrally inserted into the grids 121, the first electrode assembly 114 is connected with the end walls 126 and further penetrates through the through holes, and the second electrode assembly 116 covers one ends of the grids 121 far from the end walls 126. The first electrode assembly 114, the cell 112, and the second electrode assembly 116 are assembled outside the case 12, the first electrode assembly 114, the cell 112, and the second electrode assembly 116 are integrally inserted into the grid 121, the cell 112 is accommodated in the grid 121, the first electrode assembly 114 is connected to the end wall 126 and further penetrates through the through hole to close the through hole, and the second electrode assembly 116 is connected to the peripheral wall 122 and covers the grid 121.

A plurality of end walls 126 are arranged at opposite ends of the peripheral wall 122, and the end walls 126 arranged at the same end of the peripheral wall 122 are arranged with one grid 121 apart, so that adjacent cell assemblies 11 are inserted into the adjacent grids 121 in opposite directions, and thus one end of the peripheral wall 122 is arranged with the first electrode assembly 114 and the second electrode assembly 116 in sequence with intervals, so that the adjacent cell assemblies 11 are connected in series.

The battery module 10 further includes a rubber plug 13, a liquid injection hole for injecting the electrolyte into the grid 121 is formed in the peripheral wall 122, and the rubber plug 13 is in interference fit with the liquid injection hole. During the liquid injection, the battery module 10 is laid down to lower the center of gravity, and the electrolyte is injected into the case 12 from the liquid injection hole in the peripheral wall 122. In addition, the pour hole is disposed on the peripheral wall 122 away from the first electrode assembly 114 and the second electrode assembly 116, thereby preventing the electrolyte overflowing during pouring into the pour hole from contaminating and corroding the first electrode assembly 114 and the second electrode assembly 116.

Referring to fig. 6 to 8, fig. 6 is a schematic cross-sectional view of a battery module 10 provided in the present application, fig. 7 is a schematic partial enlarged view of a region B in fig. 6 provided in the present application, and fig. 8 is a schematic exploded structural view of a first electrode assembly 114 provided in the present application.

The first electrode assembly 114 includes a first end cap 1141, a first connection tab 1143 and a first electrode post 1145, the first end cap 1141 is connected to the end wall 126 and covers the through hole, the first connection tab 1143 is electrically connected to one end of the battery cell 112, and the first electrode post 1145 is electrically connected to the first connection tab 1143 and penetrates through the first end cap 1141. The battery cell 112 is electrically connected to the first connecting plate 1143, and the first connecting plate 1143 is electrically connected to the first electrode post 1145.

It should be explained that, as described in the above embodiment, the first connecting plate 1143 is connected to the battery cell 112 outside the casing 12, so that the first connecting plate 1143 and the battery cell 112 can be connected together by using a shorter tab of the battery cell 112 without being shielded by the casing 12, thereby avoiding excessive tab occupation space and improving the space utilization of the casing 12. The connection mode can be ultrasonic welding and friction welding.

Optionally, the through hole is circular, and correspondingly, the outer contour of the first end cap 1141 is also circular. The circular first end cap 1141 is fitted with the circular through hole to improve fault tolerance.

First end cap 1141 is provided with the overlap joint portion, and the overlap joint portion is set up on the medial surface of end wall 126 to form spacing effect to first end cap 1141, prevent that first end cap 1141 from wearing out from the through-hole when moving to the through-hole department in following grid 121, play the positioning action to first end cap 1141 in follow-up welding engineering with casing 12. Further, the end wall 126 is provided with a limiting groove, and the overlapping portion is limited in the limiting groove.

The first electrode assembly 114 further includes a first plastic pad 1147 and a first insulating ring 1149. The first plastic pad 1147 is disposed between the first end cap 1141 and the first connection plate 1143 to insulate the first end cap 1141 from the first connection plate 1143. The first insulating ring 1149 is sleeved on the first electrode post 1145 to insulate the first electrode post 1145 from the first end cap 1141.

The length of the first plastic pad 1147 is greater than the length of the battery cell 112, so that the first plastic pad 1147 can prevent the battery cell 112 from being scratched on the housing 12 and damaging the battery cell 112 in the process of placing the battery cell 112 in the housing 12.

Referring to fig. 7 and 9, fig. 9 is an exploded view of the second electrode assembly 116 according to the present application.

The second electrode assembly 116 includes a second end cap 1161, a second connecting sheet 1163 and a second pole piece 1165, the second end cap 1161 is connected to the peripheral wall 122 and covers the grid 121, the second connecting sheet 1163 is electrically connected to an end of the battery cell 112 away from the first electrode assembly 114, the second pole piece 1165 is electrically connected to the second connecting sheet 1163 and penetrates through the second end cap 1161, and the second pole piece 1165 is used for charging and discharging the battery cell 112.

It should be noted that, as described in the above embodiment, the second connecting piece 1163 is connected to the battery cell 112 outside the casing 12, so that the second connecting piece 1163 and the battery cell 112 can be connected together by using a shorter tab of the battery cell 112 without being shielded by the casing 12, thereby avoiding excessive tab occupation space and improving the space utilization of the casing 12. The connection mode can be ultrasonic welding and friction welding.

It is noted that in one case, the first electrode 1145 is a positive electrode, and the second electrode 1165 is a negative electrode; in another case, the first pole 1145 is a negative pole and the second pole 1165 is a positive pole.

The second electrode assembly 116 further includes a second plastic pad 1167 and a second insulating ring 1169. A second plastic pad 1167 is disposed between the second end cap 1161 and the second connecting pad 1163 to insulate the second end cap 1161 from the second connecting pad 1163. A second insulating ring 1169 is disposed on the second pole 1165 to insulate the second pole 1165 from the second end cap 1161.

The length of the second plastic pad 1167 is greater than the length of the battery cell 112, so that the second plastic pad 1167 can prevent the battery cell 112 from being scratched on the housing 12 and damaging the battery cell 112 in the process of placing the battery cell 112 in the housing 12.

Referring to fig. 3, in an embodiment, the battery cell 112 is a full tab structure 1124, and the multi-layer copper foil is wound first, and then the end of the winding core is integrally pressed to form the full tab structure 1124 serving as a tab, where the full tab structure 1124 has advantages of large conductive area, small resistance and small heat generation. The first connecting plate 1143 includes a first fixing portion 1142, a second fixing portion 1144 and a main body portion 1146, the opposite ends of the main body portion 1146 are respectively provided with the first fixing portion 1142 and the second fixing portion 1144 to form a U-shaped structure, the first fixing portion 1142 and the second fixing portion 1144 are respectively electrically connected to the battery cell 112, and the first electrode 1145 penetrates through the main body portion 1146. Similarly, the second connecting plate 1163 may have the same structure as the first connecting plate 1143 to connect with the full tab structure 1124.

Referring to fig. 10, fig. 10 is an exploded view of another embodiment of the electric core assembly 11 provided in the present application.

In another embodiment, the cell is a die-cut tab structure 1126. The battery cell 112 is a die-cut tab structure 1126, and is formed by punching the edge of a copper foil to form a tab piece, and then after a plurality of layers of copper foils are wound, a plurality of tab pieces are overlapped together to form the die-cut tab structure 1126 serving as a tab, wherein the die-cut tab structure 1126 has the advantages of small area, easy deformation and convenient bending. The first connecting plate 1143 includes a first fixing portion 1142, a second fixing portion 1144 and a main body portion 1146, the opposite ends of the main body portion 1146 are respectively provided with a first fixing portion 1142 and a second fixing portion 1144 stacked with the main body portion 1146, the first fixing portion 1142 and the second fixing portion 1144 are respectively electrically connected to the battery cell 112, and the first electrode 1145 penetrates through the main body portion 1146.

The specific assembling process is as follows: first fixing portion 1142 and second fixing portion 1144 are at 90 degrees to main body portion 1146, respectively, die-cut tab structure 1126 is connected to first fixing portion 1142 and second fixing portion 1144, respectively, and then first fixing portion 1142 and second fixing portion 1144 are laterally pushed until first fixing portion 1142 and second fixing portion 1144 are stacked with main body portion 1146, respectively, so as to reduce the occupancy rate of die-cut tab structure 1126 in space. Similarly, the second connecting plate 1163 may have the same structure as the first connecting plate 1143 to connect with the full tab structure 1124.

In the present application, first the first electrode assembly 114, the cell 112 and the second electrode assembly 116 are assembled outside the case 12, and then the first electrode assembly 114, the cell 112 and the second electrode assembly 116 are integrally inserted into the grid 121, the first electrode assembly 114 covering one end of the grid 121, and the second electrode assembly 116 covering the opposite end of the grid 121. Because the first electrode assembly 114 and the second electrode assembly 116 are respectively connected with the tabs at the two ends of the battery cell 112 outside the casing 12, the first electrode assembly 114 and the second electrode assembly 116 can be respectively connected with the battery cell 112 by using the tabs with shorter length of the battery cell 112 on the premise of no shielding of the casing 12, thereby avoiding excessive occupied space of the tabs and improving the space utilization rate of the casing 12.

If a plurality of cells 112 are assembled into the grid 121 and then the first electrode assembly 114 and the second electrode assembly 116 are connected to the cells 112 at both ends of the casing 12, the following disadvantages may occur: 1. the operation difficulty is high, the space is insufficient, and welding and dust removal are difficult; 2. the utilization rate of the height space of the shell 12 is reduced, and the volume energy density is also reduced; 3. the manufacturing cost is high.

In addition, the first electrode assembly 114 and the second electrode assembly 116 are distributed at both ends of the case 12, so that the battery module 10 can be made narrow and long, and the battery module 10 is conveniently arranged in the chassis of the electric vehicle in a lying manner, i.e., the first electrode assembly 114 and the second electrode assembly 116 face the height portion of the chassis, and the battery module 10 completely occupies the height space of the chassis, thereby improving the space utilization rate of the height portion of the chassis. In addition, the battery module 10 can be reduced in number by making the size of the battery module 10 large, thereby reducing the occupation of the chassis space by the auxiliary material such as the case 12.

It should be explained here that, in the field of electric vehicles, the battery module 10 is composed of a plurality of single batteries, and the single batteries are generally single-pass batteries, that is, the first electrode assembly 114 and the second electrode assembly 116 are both at the same end of the single battery, in order to accommodate the first electrode assembly 114 and the second electrode assembly 116 at the same time, the ends of the single batteries are made longer, so that the first electrode assembly 114 and the second electrode assembly 116 are placed towards the upper end face of the chassis (if the positive and negative electrodes are placed towards the height portion of the chassis, the length of the single battery is too long to be placed), in order to arrange the leads electrically connected with the first electrode assembly 114 and the second electrode assembly 116, so that the height space of the chassis is occupied too much. In fact, because the ride height space is fixed due to electric vehicle manufacturing standards, the increased utilization of the ride height space also increases the energy density of power cell 100.

The above is only the preferred embodiment of the present invention, and the patent scope of the present invention is not limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. The utility model provides a battery module which characterized in that, battery module includes: the electric heating device comprises a plurality of electric core assemblies and a shell, wherein the shell is provided with a plurality of grids, and the electric core assemblies are respectively inserted into the shell;

the cell assembly comprises a cell, a first electrode assembly and a second electrode assembly, the first electrode assembly is electrically connected with one end of the cell, the second electrode assembly is electrically connected with the opposite end of the cell, the first electrode assembly, the cell and the second electrode assembly are integrally inserted into the grid, the first electrode assembly covers one end of the grid, and the second electrode assembly covers the opposite end of the grid.

2. The battery module according to claim 1, wherein: the shell comprises a peripheral wall and a plurality of partition walls, the peripheral wall is surrounded to form a cavity, and the partition walls are arranged in the cavity at intervals to form the grids in a separated mode.

3. The battery module according to claim 1, wherein: the grids comprise a first grid and a second grid which are arranged at intervals, and the battery cell is contained in the first grid.

4. The battery module according to claim 2, wherein: the casing still includes a plurality of end walls, a plurality of end walls cap respectively the one end of a plurality of grids, the through-hole has been seted up to the end wall, first electrode subassembly, electric core and second electrode subassembly are whole to be inserted in the grid, first electrode subassembly with the end wall is connected and further wears to establish the through-hole, second electrode subassembly cap seal the grid keep away from the one end of end wall.

5. The battery module according to claim 4, wherein: the end walls are arranged at two opposite ends of the peripheral wall, and the end walls arranged at the same end of the peripheral wall are arranged at intervals of one grid.

6. The battery module according to claim 4, wherein: the first electrode assembly comprises a first end cover, a first connecting sheet and a first pole, the first end cover is connected with the end wall and covers the through hole, the first connecting sheet is electrically connected with one end of the battery cell, and the first pole is electrically connected with the first connecting sheet and penetrates through the first end cover.

7. The battery module according to claim 6, wherein: the battery cell is a full-tab structure, the first connecting piece comprises a first fixing portion, a second fixing portion and a main body portion, the two opposite ends of the main body portion are respectively provided with the first fixing portion and the second fixing portion to form a U-shaped structure, the first fixing portion and the second fixing portion are respectively electrically connected with the full-tab structure of the battery cell, and the main body portion is penetrated by the first pole.

8. The battery module according to claim 6, wherein: the battery cell is a die-cutting lug structure, the first connecting piece comprises a first fixing part, a second fixing part and a main body part, the two opposite ends of the main body part are respectively provided with the first fixing part and the second fixing part which are stacked on the main body part, the first fixing part and the second fixing part are respectively electrically connected with the die-cutting lug structure of the battery cell, and the main body part is penetrated by the first pole.

9. The battery module according to claim 2, characterized in that: the battery module further comprises a plurality of rubber plugs, a plurality of liquid injection holes used for injecting electrolyte into the grids are formed in the peripheral wall, and the plurality of rubber plugs are in interference fit with the liquid injection holes one by one.

10. A power battery, characterized by: the power battery comprises an outer casing and a plurality of battery modules according to any one of claims 1 to 9, the plurality of battery modules being arranged side by side in the outer casing, the first electrode assembly and the second electrode assembly of the battery modules facing a thickness region of the outer casing.