CN215496959U

CN215496959U - Battery module

Info

Publication number: CN215496959U
Application number: CN202120765379.0U
Authority: CN
Inventors: 王博; 项小雷; 丁浩; 李伟; 董宇; 王彤
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2022-01-11
Anticipated expiration: 2031-04-14

Abstract

The present invention relates to a battery module, including: the upper shell and the lower shell are oppositely arranged in a first direction and jointly define an accommodating cavity; the battery core group is accommodated in the accommodating cavity and comprises a plurality of battery core monomers, the battery core monomers are stacked along a second direction, each battery core monomer longitudinally extends along a third direction, and battery core lugs are respectively arranged on two sides of each battery core monomer in the third direction; the first heat-conducting fixing layer is positioned between the upper shell and the electric core group and is connected with the plurality of electric core monomers; and the second heat-conducting fixing layer is positioned between the lower shell and the electric core group and is connected with the plurality of electric core monomers. Above-mentioned battery module, first heat conduction fixed bed and second heat conduction fixed bed when realizing that electric core group and last casing, down the casing between be connected, can regard as the partly supreme casing of heat transfer and the casing down with the heat transfer that electric core group produced of heat conduction route, improved battery module's heat transfer efficiency, effectively improved battery module's rigidity and structural strength simultaneously.

Description

Battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery module.

Background

With the increasing environmental pollution and the gradual improvement of environmental awareness of people, the new energy electric vehicle without pollution and with low noise is more and more popular among people in the using process, and the occupation ratio of the new energy electric vehicle in the whole vehicle market is more and more.

Soft packet of lithium ion battery module is because of the internal resistance is little, advantages such as specific capacity height extensively regard as the power source spring of new forms of energy car, however, the battery module can produce a large amount of heats in the use, especially the vehicle is at high-speed climbing, open and stop, when the high-rate rechargeable battery, the big multiplying power output of battery module or input will produce a large amount of heats, but the electric core among the current battery module is subject to the unable high-efficient heat dissipation of module structure, and then causes the thermal runaway of battery module, the security and the life of battery module have been influenced.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a battery module that can achieve the technical effect of improving heat dissipation efficiency.

According to an aspect of the present application, there is provided a battery module including:

the upper shell and the lower shell are oppositely arranged in a first direction and jointly define an accommodating cavity;

the battery core group is accommodated in the accommodating cavity and comprises a plurality of battery core monomers, the battery core monomers are stacked along a second direction, each battery core monomer longitudinally extends along a third direction, and battery core lugs are respectively arranged on two sides of each battery core monomer in the third direction;

the first heat-conducting fixing layer is positioned between the upper shell and the battery core group and is connected with the plurality of battery core monomers; and

the second heat-conducting fixing layer is positioned between the lower shell and the battery core group and is connected with the plurality of battery core monomers;

wherein the first direction, the second direction and the third direction are perpendicular to each other.

In one embodiment, the upper housing includes an upper cover plate, a first side plate and a second side plate, the first side plate and the second side plate are respectively disposed on two sides of the upper cover plate in the second direction and extend from the upper cover plate toward the lower housing along the first direction, and one side of the first side plate and one side of the second side plate, which is far away from the upper cover plate, are connected to the lower housing.

In one embodiment, the battery cell group further comprises a plurality of buffer insulating pads, and one buffer insulating pad is arranged between two adjacent battery cell monomers.

In one embodiment, the battery module further includes two fixing supports, two the fixing supports are respectively located the electric core group is in both sides in the third direction, every the fixing support is dorsad one side of electric core group is equipped with a plurality of utmost point ear spread grooves, a plurality of utmost point ear spread grooves are followed the second direction interval is arranged, every utmost point ear spread groove is followed first direction lengthwise extension, every utmost point ear spread groove has seted up the intercommunication the utmost point ear connecting hole that holds the chamber, every electric core utmost point ear passes utmost point ear connecting hole correspondence accept in one utmost point ear spread groove.

In one embodiment, the battery module further comprises a plurality of base plates, each base plate is correspondingly accommodated in one of the tab connecting grooves, and one end of the battery cell tab, which is located in the tab connecting groove, is located on one side, back to the battery cell group, of the base plate.

In one embodiment, each fixing bracket is provided with a limiting groove on one side facing the electric core group, an end part of the electric core unit in the third direction is inserted into the limiting groove, the limiting groove comprises a first guide surface and a second guide surface which are arranged at intervals in the second direction, and the distance between the first guide surface and the second guide surface in the second direction gradually decreases from one side facing the electric core group to one side away from the electric core group.

In one embodiment, the battery module further comprises two insulating plates, the two insulating plates are respectively arranged on one sides of the two fixing brackets away from the battery core group, and the fixing brackets and the insulating plates are buckled with each other to jointly define an insulating space.

In one embodiment, the battery module further includes a total positive lead-out row and a total negative lead-out row, the total positive lead-out row and the total negative lead-out row are spaced in the second direction, one end of the total positive lead-out row and one end of the total negative lead-out row are located between the fixing bracket and the insulating plate, and the other end of the total positive lead-out row and the other end of the total negative lead-out row penetrate through the insulating plate.

In one embodiment, the battery module further comprises two end plates, the two end plates are respectively located on one side of the insulating plate away from the fixing support, and each end plate is connected with the upper shell and the lower shell.

In one embodiment, the battery module further comprises a collecting unit, one end of the collecting unit is located at one side of the electric core group in the first direction and extends along the third direction, and the other end of the collecting unit is limited at one side of the fixing bracket facing away from the electric core group.

Above-mentioned battery module, first heat conduction fixed bed and second heat conduction fixed bed when realizing that electric core group and last casing, down the connection between the casing, can regard as the partly heat transfer supreme casing and the casing down with the electric core group production of heat conduction route, consequently compare in prior art and show and increase heat transfer area and contact path, improved battery module's heat transfer efficiency, guarantee that battery module heat normal transmission under the condition of high magnification export/input. Simultaneously, the setting of first heat conduction fixed layer and second heat conduction fixed layer has increased the connection of electric core group and last casing, lower casing, has effectively improved battery module's rigidity and structural strength, has improved the mechanical reliability of battery module in the use.

Drawings

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the utility model;

fig. 2 is a schematic view illustrating an internal structure of a battery module according to an embodiment of the present invention;

fig. 3 is an exploded view illustrating a battery module according to an embodiment of the present invention.

The reference numbers illustrate:

100. a battery module; 10a, an upper shell; 10b, a lower shell; 20. the electric core group; 21. a battery cell monomer; 212. A tab; 23. a buffer insulating pad; 25. fixing belts; 30a, a first heat-conducting fixed layer; 30b, a second heat-conducting fixed layer; 40. fixing a bracket; 50. an insulating plate; 52. a total positive insulating cap; 54. a total negative insulating cap; 60. A base plate; 70a, a total positive lead-out row; 70b, a total negative lead-out row; 80. an end plate; 90. and a collecting unit.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Fig. 1 is a schematic structural view illustrating a battery module according to an embodiment of the present invention; fig. 2 is a schematic view illustrating an internal structure of a battery module according to an embodiment of the present invention; fig. 3 is an exploded view illustrating a battery module according to an embodiment of the present invention.

Referring to fig. 1 to 3, a battery module 100 according to an embodiment of the present invention includes an upper case 10a, a lower case 10b, and a battery cell pack 20. Wherein, go up casing 10a and lower casing 10b and to closing the setting and define jointly and hold the chamber in the formation on the first direction, electric core group 20 is acceptd in holding the intracavity, electric core group 20 includes a plurality of electric core monomers 21, a plurality of electric core monomers 21 are along the range upon range of setting of second direction, every electric core monomer 21 extends along third direction lengthwise, every electric core monomer 21 is equipped with electric core utmost point ear 212 respectively in the both sides of third direction, electric core monomer 21 can establish ties or connect in parallel separately, and the connected mode can set up according to the design needs.

The battery module 100 is substantially a cubic structure, the first direction is a height direction of the battery module 100 in fig. 1, the second direction is a width direction of the battery module 100 in fig. 1, and the third direction is a length direction of the battery module 100 in fig. 1.

Referring to fig. 1 to 3, the upper housing 10a includes an upper cover plate, a first side plate and a second side plate. The upper cover plate is of a rectangular plate-shaped structure, the thickness direction of the upper cover plate extends along a first direction, the width direction of the upper cover plate extends along a second direction, and the length direction of the upper cover plate extends along a third direction. The first side plate and the second side plate are respectively disposed on two opposite sides of the upper cover plate in the second direction, and respectively extend from an edge of the upper cover plate toward the lower case 10b in the first direction. The lower case 10b has a rectangular plate-like structure, a thickness direction of the lower case 10b extends in a first direction, a width direction of the lower case 10b extends in a second direction, and a length direction of the lower case 10b extends in a third direction. One sides of the first side plate and the second side plate away from the upper cover plate are connected with two side edges of the lower housing 10b in the second direction.

As such, the upper and

lower cases

10a and 10b together define a receiving cavity for receiving the electric core pack 20. It is to be understood that the shapes of the upper and

lower cases

10a and 10b are not limited thereto, and may be set as needed to meet various requirements.

Further, the battery module 100 further includes a first heat conductive fixing layer 30a and a second heat conductive fixing layer 30 b. The first heat-conducting fixing layer 30a is positioned between the upper casing 10a and the electric core assembly 20 and connects the plurality of electric core units 21, and the shape of the first heat-conducting fixing layer 30a is similar to the shape of the upper cover plate of the upper casing 10a and covers the surfaces of the electric core assembly 20 and the upper cover plate as much as possible. The second heat-conducting fixing layer 30b is located between the lower casing 10b and the cell group 20 and connects the plurality of cell units 21, and the shape of the second heat-conducting fixing layer 30b is similar to that of the lower casing 10b and covers the surfaces of the cell group 20 and the lower casing 10b as much as possible.

So, first heat conduction fixed layer 30a and second heat conduction fixed layer 30b are when realizing being connected between electric core group 20 and upper casing 10a, lower casing 10b, can regard as the partly heat transfer that produces electric core group 20 to upper casing 10a and lower casing 10b of heat conduction route, consequently compare and show to have increased heat transfer area and contact path in prior art, have improved battery module 100's heat transfer efficiency, guarantee battery module 100 heat normal transmission under the condition of high multiplying power output/input. Meanwhile, the first heat-conducting fixing layer 30a and the second heat-conducting fixing layer 30b are arranged to increase the connection between the electric core group 20 and the upper shell 10a and between the electric core group and the lower shell 10b, so that the rigidity and the structural strength of the battery module 100 are effectively improved, and the mechanical reliability of the battery module 100 in the use process is improved.

Specifically, in some embodiments, the first and second thermally

conductive fastening layers

30a and 30b are each formed from thermally conductive structural adhesive. It is understood that in other embodiments, the first and second thermally

conductive fastening layers

30a and 30b may be formed of other materials with thermal conductivity with an adhesive added.

In some embodiments, the battery core pack 20 further includes a plurality of buffering insulating pads 23 and at least one fixing band 25, the buffering insulating pads 23 are arranged at intervals along the second direction, one buffering insulating pad 23 is disposed between two adjacent battery cell units 21, and the buffering insulating pad 23 is used for bonding the two adjacent battery cell units 21, so as to reserve a certain expansion space for the battery cell units 21, and thus provide a sufficient gap for the charging and discharging size change of the battery cell units 21. Meanwhile, the buffering insulating pad 23 can also cut off heat transfer when the battery cell unit 21 is out of thermal runaway, so that the safety of the battery module 100 is effectively improved. The fixing tape 25 bundles the plurality of battery cells 21 and the buffer insulating pad 23 in the third direction, so as to achieve stacking and fixing during assembly.

In some embodiments, the battery module 100 further includes two fixing brackets 40 and two insulating plates 50, the two fixing brackets 40 are respectively disposed at two opposite sides of the electric core pack 20 in the third direction, the two insulating plates 50 are respectively disposed at one side of the two fixing brackets 40 facing away from the electric core pack 20, and the fixing brackets 40 and the insulating plates 50 are fastened to each other to jointly define an insulating space to ensure electrical safety.

Specifically, in some embodiments, each fixing bracket 40 is provided with a plurality of limiting grooves on one side facing the battery cell group 20, the plurality of limiting grooves are arranged at intervals along the second direction, each limiting groove extends lengthwise along the first direction and matches with the shape of the battery cell unit 21, and the ends of the battery cell unit 21 on both sides in the third direction are inserted into the limiting grooves to be limited by the limiting grooves.

Preferably, the spacing groove comprises a first guide surface and a second guide surface which are arranged at intervals in the second direction, and the distance between the first guide surface and the second guide surface in the second direction is gradually reduced from one side of the electric core assembly 20 to the side of the electric core assembly 20. Thus, the second guide surface and the second guide surface have a guiding function on the cell unit 21, and one side end of the cell unit 21 in the third direction is inserted into the limiting groove under the guidance of the first guide surface and the second guide surface.

Further, one side of the fixed support 40, which faces away from the electric core assembly 20, further includes a plurality of tab connecting grooves, the tab connecting grooves are arranged at intervals along the second direction, each tab connecting groove extends along the longitudinal length of the first direction, each tab connecting groove is provided with a tab connecting hole extending along the longitudinal length of the first direction, each electric core tab 212 passes through the tab connecting hole to be accommodated in the tab connecting groove, and series connection and parallel connection between the electric core units 21 are realized through laser welding.

In some embodiments, the battery module 100 further includes a plurality of backing plates 60, each backing plate 60 is correspondingly received in one tab connecting slot, and one end of the cell tab 212 passing through the tab connecting slot is located on one side of the backing plate 60 away from the battery pack 20. The arrangement of the backing plate 60 ensures that the cell tabs 212 are stacked on the surface of the backing plate 60 after being bent, and the cell tabs 212 after laser welding cannot be melted through.

In some embodiments, a side of the insulating plate 50 facing away from the fixing bracket 40 is provided with a total positive insulating cap 52 and a total negative insulating cap 54, and the total positive insulating cap 52 and the total negative insulating cap 54 are spaced apart in the second direction. The battery module 100 further comprises a total positive lead-out row 70a and a total negative lead-out row 70b, the total positive lead-out row 70a and the total negative lead-out row 70b are arranged at intervals in the second direction, one end of the total positive lead-out row 70a and one end of the total negative lead-out row 70b are located between the fixing support 40 and the insulating plate 50, and the other end of the total positive lead-out row 70a and the other end of the total negative lead-out row 70b penetrate through the insulating plate 50 and are respectively limited in the total positive insulating cap 52 and the total negative insulating cap 54, so that the battery module 100 is electrically connected to the outside, and indirect protection after external connection is realized through the total positive insulating cap 52 and the total negative insulating cap 54.

In some embodiments, the battery module 100 further includes two end plates 80, the two end plates 80 being located at sides of the insulating plates 50, which are away from the fixing brackets 40, respectively, and the upper case 10a and the lower case 10b are connected to each other by the two end plates 80. Specifically, in some embodiments, the end plates 80 achieve their structural connection with the upper and

lower cases

10a and 10b by means of laser welding as force-receiving members of the entire battery module 100.

In some embodiments, the battery module 100 further includes a collecting unit 90, one end of the collecting unit 90 is located on one side of the battery cell group 20 in the first direction and extends along the third direction, and the other end of the collecting unit 90 is limited on one side of the fixing support 40 away from the battery cell group 20, so as to collect the voltage and temperature of the battery cell unit 21 inside the whole battery module 100 and output information to the outside.

Above-mentioned battery module 100 has increased heat conduction route and heat conduction area through setting up first heat conduction fixed layer 30a and second heat conduction fixed layer 30b between electric core group 20 and last casing 10a, electric core group 20 and lower casing 10b, guarantees the heat transfer of battery module 100 in the high magnification use, improves electric core group 20 and last casing 10a simultaneously, the adhesive force between casing 10b down, effectively increase whole battery module 100's intensity and rigidity. In addition, the buffering insulating pad 23 between the adjacent battery cell monomers 21 can ensure that the heat of the battery cell monomers 21 is not transferred between the adjacent battery cell monomers 21 when the thermal runaway occurs, so that the overall safety performance of the battery module 100 is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A battery module, comprising:

2. The battery module according to claim 1, wherein the upper case includes an upper cover plate, a first side plate, and a second side plate, the first side plate and the second side plate are respectively provided on both sides of the upper cover plate in the second direction and extend from the upper cover plate toward the lower case along the first direction, and a side of the first side plate and the second side plate away from the upper cover plate is connected to the lower case.

3. The battery module of claim 1, wherein the cell pack further comprises a plurality of buffer insulating pads, and one buffer insulating pad is disposed between two adjacent cell units.

4. The battery module of claim 1, further comprising two fixing brackets, wherein the two fixing brackets are respectively disposed on two sides of the electric core assembly in the third direction, each fixing bracket is disposed on one side of the electric core assembly opposite to the electric core assembly, the plurality of tab connecting grooves are arranged at intervals along the second direction, each tab connecting groove extends lengthwise along the first direction, each tab connecting groove is provided with a tab connecting hole communicated with the accommodating cavity, and each electric core tab passes through the tab connecting hole and is correspondingly accommodated in one tab connecting groove.

5. The battery module of claim 4, further comprising a plurality of backing plates, wherein each backing plate is correspondingly received in one of the tab connecting grooves, and one end of the cell tab located in the tab connecting groove is located on a side of the backing plate facing away from the cell group.

6. The battery module according to claim 4, wherein each of the fixing brackets is provided with a limiting groove at one side facing the battery pack, one side end of the battery cell in the third direction is inserted into the limiting groove, the limiting groove comprises a first guide surface and a second guide surface which are arranged at an interval in a second direction, and the distance between the first guide surface and the second guide surface in the second direction gradually decreases from one side facing the battery pack to the side away from the battery pack.

7. The battery module according to claim 4, further comprising two insulating plates respectively disposed on the sides of the two fixing brackets away from the cell group, wherein the fixing brackets and the insulating plates are fastened to each other to define an insulating space.

8. The battery module according to claim 7, further comprising a total positive lead-out row and a total negative lead-out row, the total positive lead-out row and the total negative lead-out row being spaced apart in the second direction, one end of the total positive lead-out row and one end of the total negative lead-out row being located between the fixing bracket and the insulating plate, and the other end of the total positive lead-out row and the other end of the total negative lead-out row passing through the insulating plate.

9. The battery module according to claim 7, further comprising two end plates located on the side of the insulating plate away from the fixing bracket, respectively, and each of the end plates connects the upper case and the lower case.

10. The battery module according to claim 4, further comprising a collecting unit, wherein one end of the collecting unit is located at one side of the electric core set in the first direction and extends along the third direction, and the other end of the collecting unit is limited at one side of the fixing bracket facing away from the electric core set.