CN211858734U

CN211858734U - Battery module, battery pack and vehicle

Info

Publication number: CN211858734U
Application number: CN202020716530.7U
Authority: CN
Inventors: 杨重科; 冯帅; 赵亮; 李成亮; 翁志福
Original assignee: Kunshan Bao Innovative Energy Technology Co Ltd
Current assignee: Kunshan Bao Innovative Energy Technology Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-11-03
Anticipated expiration: 2030-04-30

Abstract

The utility model discloses a battery module, battery package and vehicle. Wherein, the battery module includes: a plurality of sub-modules, each sub-module comprising: the stacking body comprises a plurality of stacking bodies, and the stacking bodies are formed by stacking a plurality of soft-package battery cells; in one stacked body, the positive electrode tabs and the negative electrode tabs of each soft-package battery cell are respectively connected to form positive electrode connecting parts and negative electrode connecting parts, and the stacked body is connected in series with the negative electrode connecting part/positive electrode connecting part of the other stacked body adjacent to the stacked body through the positive electrode connecting part/negative electrode connecting part; a terminal tab protective case provided at the positive electrode connecting portion or the negative electrode connecting portion of the stacked body at both ends; a middle tab protecting shell; which is provided between two adjacent stacks. The single soft package battery cells in the battery module are connected in parallel, and the tabs are connected in series and are directly connected, so that the cascade connection among all stacked modules is realized. The series-parallel copper bars and the external mounting structures are reduced, the grouped accessories of the modules are reduced, the cost and the weight are reduced, and the space utilization rate is improved.

Description

Battery module, battery pack and vehicle

Technical Field

The utility model relates to a new energy automobile field particularly, the utility model relates to a battery module, battery package and vehicle.

Background

With the continuous popularization of new energy automobiles, the use requirements of power batteries in the new energy automobiles become higher and higher. Particularly, the requirement of a user on the continuous mileage of the new energy automobile is continuously improved, and the power battery pack of the common new energy automobile exceeds 1m in both the length direction and the width direction; however, in the current market, the length of the battery module is generally about 0.3m, so at least three or even more battery modules need to be arranged in the power battery pack.

The arrangement of a plurality of battery modules requires a fixing structure to be added to each battery module, and the assembly is complicated. Meanwhile, two adjacent battery modules need to be in power connection through an external power connecting piece. The battery module mounting structure is large, which not only increases the cost, but also increases the overall weight; simultaneously, in single module volume, mounting structure has taken more inner space, causes power battery module, and battery package whole capacity reduces, and battery module sets up more in the battery package, and the space is extravagant just more. In addition, because a plurality of external power connecting pieces are needed to be arranged for power connection, the internal resistance and the cost are increased, and the internal consumption and the cost of the power battery pack in use are improved.

In summary, the existing new energy automobile battery pack still needs to be improved.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. To this end, an object of the present invention is to provide a battery module, a battery pack, and a vehicle. The single soft package battery cells in the battery module are connected in parallel, and the tabs are connected in series and are directly connected, so that the cascade connection among all stacked modules is realized. Thereby, having reduced the series-parallel connection copper bar and the outside mounting structure between the pile body, having reduced module annex in groups, reduce cost and weight improve space utilization, and then can hold more utmost point groups at the battery package, promote vehicle continuation of the journey mileage.

In one aspect of the present invention, the utility model provides a battery module. According to the utility model discloses an embodiment, this battery module includes: a plurality of sub-modules, each of said sub-modules comprising:

the laminated body comprises a plurality of stacked bodies, and each stacked body is formed by stacking a plurality of soft packaging cells; in one stacked body, positive lugs of the soft-package battery cells are connected to form a positive connecting part, negative lugs of the soft-package battery cells are connected to form a negative connecting part, and the stacked body is connected in series with the negative connecting part/positive connecting part of the other stacked body adjacent to the stacked body through the positive connecting part/negative connecting part;

a terminal tab protective case provided at the positive electrode connecting portion or the negative electrode connecting portion of the stacked body at both ends; two ends of the terminal lug protective shell are respectively provided with two first positioning structures, and each first positioning structure comprises a cylindrical through hole and a cylindrical groove threaded hole;

the middle tab protective cases are arranged between two adjacent stacked bodies, and one middle tab protective case is arranged between each two adjacent stacked bodies up and down; two ends of the middle tab protecting shell are respectively provided with a second positioning structure, and the second positioning structure comprises a cylindrical through hole and a cylindrical groove threaded hole;

the side plates are arranged on the left side and the right side of the laminated body, a plurality of protruding structures and side plate through holes are distributed on the side plates, the protruding structures are matched with the cylindrical groove threaded holes, and the side plate through holes are matched with the cylindrical through holes;

and the insulation plates are arranged on the upper side and the lower side of the laminated body.

According to the utility model discloses battery module comprises a plurality of submodule pieces, and every submodule piece includes: the lamination body, the lamination body includes a plurality of pile bodies, includes a plurality of laminate core in every pile body, and positive ear in each laminate core collects and forms positive connecting portion, and the negative pole ear collects and forms negative pole connecting portion. One stack is connected in series by the positive electrode connecting portion and the negative electrode connecting portion of the other stack adjacent thereto, or one stack is connected in series by the negative electrode connecting portion and the positive electrode connecting portion of the other stack adjacent thereto. And a middle tab protective shell is respectively arranged between two adjacent stacked bodies from top to bottom, and the positive electrode connecting part or the negative electrode connecting part of the stacked bodies positioned at two ends is provided with a tail end tab protective shell. The tail end lug protective shell is provided with a first positioning structure, the middle lug protective shell is provided with a second positioning structure, and cylindrical groove threaded holes in the first positioning structure and the second positioning structure are matched with the protruding structures on the side plates, so that the side plates can be conveniently and quickly mounted and fixed by screws; the cylindrical through hole is matched with the side plate through hole; and fixing the plurality of sub-modules by using long screws to penetrate through the side plate through holes and the cylindrical through holes, thereby preparing the large-scale battery module. From this, the soft packet of electric core of monomer among this battery module is parallelly connected, and the concatenation utmost point ear lug connection has realized the cascade between each pile body module. Thereby, having reduced the series-parallel connection copper bar and the outside mounting structure between the pile body, having reduced module annex in groups, reduce cost and weight improve space utilization, and then can hold more utmost point groups at the battery package, promote vehicle continuation of the journey mileage. Meanwhile, the use of external power connecting pieces between modules is reduced, bolt connection between modules is avoided, the connection stability and reliability of the power connecting pieces do not need to be considered, the connection internal resistance is reduced, and further the internal consumption of the power battery pack in use is reduced.

Optionally, the terminal tab protective shell, the middle tab protective shell and the insulating plate are made of insulating flame-retardant materials.

Optionally, the length of the battery module is not less than 600 mm.

Optionally, the positive electrode connection part and the negative electrode connection part are connected in series by laser welding, ultrasonic welding or riveting.

Optionally, the positive electrode connection part and the negative electrode connection part have structural holes.

Optionally, the side plates have a rib structure with indentations.

Optionally, buffering foam is arranged between every two adjacent laminated sheets, and buffering foam is arranged between the laminated sheets and the side plate.

Optionally, a structural adhesive layer is arranged between each soft-packaged battery cell in the stacked body, between two adjacent stacked body, and between the side plate and the buffer foam and the stacked body.

Optionally, the battery module further comprises: and the packing belts are arranged outside the side plates and the insulating plates.

In another aspect of the present invention, the utility model provides a battery pack. According to the utility model discloses an embodiment, this battery package includes: the battery module of the above embodiment. Therefore, the battery pack has all the features and advantages described above for the battery module, and thus, the description thereof is omitted. In general, the battery pack has the advantages of lower cost and weight, higher space utilization rate and reliability and the like.

In another aspect of the present invention, a vehicle is provided. According to an embodiment of the present invention, the vehicle includes the battery module of the above embodiment or the battery pack of the above embodiment. Therefore, the vehicle has all the features and advantages described above for the battery module or the battery pack, and thus, the detailed description is omitted. In general, the vehicle has better reliability and endurance mileage.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a plurality of battery modules according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a submodule in a battery module according to an embodiment of the present invention;

fig. 3 is an exploded view of one submodule in a battery module according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a flexible package cell in a battery module according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a laminated body in a battery module according to an embodiment of the present invention;

fig. 6 is a schematic view of a connection portion between two adjacent stacked bodies in a stacked body in a battery module according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a laminated body in a battery module according to an embodiment of the present invention;

FIG. 8 is an enlarged view of portion A of FIG. 7;

FIG. 9 is an enlarged view of portion B of FIG. 7;

fig. 10 is a schematic structural view of a terminal tab protective housing in a battery module according to an embodiment of the present invention;

fig. 11 is a schematic structural view of an intermediate tab protection housing in a battery module according to an embodiment of the present invention;

fig. 12 is a schematic structural view of a submodule in a battery module according to an embodiment of the present invention;

fig. 13 is a schematic structural view of a submodule in a battery module according to an embodiment of the present invention;

fig. 14 is a schematic structural view illustrating a plurality of battery modules according to an embodiment of the present invention mounted in a battery case.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

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 specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. The term "adapted" may be understood in a broad sense or specifically to mean that two or more structural units are arranged in correspondence (for example, may be coaxially arranged) and may be connected or fixed to each other.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. 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.

In one aspect of the present invention, the utility model provides a battery module. Referring to fig. 1 to 13, according to an embodiment of the present invention, the battery module includes:

the laminated body 100, the laminated body 100 comprises a plurality of stacked bodies 110, and each stacked body 110 is formed by stacking a plurality of soft package core stacks 111; in one stacked body 110, the positive electrode tabs of the soft-package battery cells 111 are connected to form a positive electrode connecting part, the negative electrode tabs of the soft-package battery cells 111 are connected to form a negative electrode connecting part, and the stacked body 110 is connected in series through the positive electrode connecting part/negative electrode connecting part and the negative electrode connecting part/positive electrode connecting part of the other stacked body 110 adjacent to the stacked body;

a terminal tab protective case 200, the terminal tab protective case 200 being provided at the positive electrode connection portion or the negative electrode connection portion of the stacked body 110 located at both ends; two ends of the terminal tab protection shell 200 are respectively provided with two first positioning structures, and each first positioning structure comprises a cylindrical through hole 210 and a cylindrical groove threaded hole 220;

the middle tab protecting cases 300 are arranged between two adjacent stacked bodies 110, and one middle tab protecting case 300 is arranged between each two adjacent stacked bodies; two ends of the terminal tab protection shell 300 are respectively provided with a second positioning structure, and the first positioning structure comprises a cylindrical through hole 310 and a cylindrical groove threaded hole 320;

the side plates 400 are arranged on the left side and the right side of the laminated body 100, a plurality of protruding structures 410 and side plate through holes 420 are distributed on the side plates 400, the protruding structures 410 are matched with the cylindrical groove threaded holes 220, and the side plate through holes 420 are matched with the cylindrical through holes 210;

and insulating plates 500, the insulating plates 500 being disposed on both upper and lower sides of the laminated body 100.

The battery module according to the embodiment of the present invention is further described in detail below.

According to some embodiments of the present invention, referring to fig. 1, after arranging a plurality of sub-modules in parallel, the usable long screw 810 passes through the side plate through-hole on the side plate and the cylindrical through-hole on the tab protection case in each sub-module, and is fixed at the end of the long screw 810 by the nut 820.

The utility model discloses an among the battery module, adopt the soft packet of electricity core that the field is common. Referring to fig. 4, the pouch cell 111 includes a positive tab 111a and a negative tab 111 b. The outside of the soft package battery cell 111 is further wrapped with a packaging structure, such as an aluminum plastic film.

According to some embodiments of the present invention, the number of stacked bodies in one stacked body at least includes two, that is, two stacked bodies located at the end portion, the number of stacked bodies located in the middle of the stacked body is not particularly limited, and may be set to 0, 1, 2, 3, etc. according to actual needs. For example, fig. 5 shows a lamination stack that includes two stacks at the ends and one stack in the middle. Fig. 6 specifically shows a structural schematic diagram of a connection portion between two adjacent stacked bodies, and as shown in fig. 6, tabs of each soft package battery cell in one stacked body are connected in parallel to form a positive electrode connection portion or a negative electrode connection portion, and are connected with a negative electrode connection portion or a positive electrode connection portion in the other stacked body. FIGS. 7-9 are further schematic views of the laminated body shown in FIG. 6 from another perspective.

Referring to fig. 8 and 9, according to some embodiments of the present invention, the positive and negative electrode connection parts have a structure hole 231, a connection area 232. The structural hole can be used for carrying out auxiliary connection on the lugs of the two stacked bodies, and the fixing of the lugs is assisted by using the structural hole to carry out riveting, bolt connection and other modes, so that the reliability of lug connection is improved.

Referring to fig. 3, according to some embodiments of the present invention, the side plates have a rib structure 430 with recesses and protrusions. Through set up the strengthening rib structure on the curb plate, can further be favorable to resisting the bulging force of electric core in the module.

Referring to fig. 10, according to some embodiments of the present invention, two first positioning structures are respectively disposed at both ends of the terminal tab protecting case 200, and the first positioning structures include a cylindrical through hole 210 and a cylindrical groove threaded hole 220. The cylindrical through-holes 210 are fitted with the side plate through-holes, and may be used to pass through the side plate through-holes and the cylindrical through-holes 210 using long screws in order to fix a plurality of battery modules. The cylindrical groove threaded hole 220 is matched with the protruding structure on the side plate, so that the side plate can be conveniently and quickly mounted and positioned and is fixed by screws.

Referring to fig. 11, according to some embodiments of the present invention, the middle tab protection case 300 is provided at both ends thereof with a second positioning structure, which includes a cylindrical through hole 310 and a cylindrical groove screw hole 320. The cylindrical through-holes 310 are adapted to the side plate through-holes and may be used to pass through the side plate through-holes and the cylindrical through-holes 310 with long screws so as to fix a plurality of battery modules; the cylindrical groove threaded hole 320 is matched with the protruding structure on the side plate, so that the side plate can be conveniently and quickly mounted and positioned and is fixed by screws.

According to some embodiments of the present invention, the side plate may be made of metal or plastic, and the metal may be, for example, aluminum, copper, iron, an alloy thereof, or the like. The plastic is preferably a high-strength thermosetting plastic, such as SMC (sheet molding compound). When the side plate is made of metal, the side plate can be formed by adopting processes such as stamping and the like, and when the side plate is made of plastic, the side plate can be formed by adopting processes such as mould injection and the like.

Terminal utmost point ear protective housing, middle utmost point ear protective housing can be parallelly connected to obtain utmost point ear for each soft-packaged electric core in the pile body and protect, and the insulation board can provide the protection for electric core. According to some embodiments of the utility model, above-mentioned terminal utmost point ear protective housing, middle utmost point ear protective housing and insulation board are insulating fire-retardant material, for example PP, ABS, PC, PA66 etc..

According to some embodiments of the present invention, the length of the battery module is not less than 600 mm.

According to some embodiments of the present invention, the positive electrode connecting portion and the negative electrode connecting portion are connected in series by laser welding, ultrasonic welding or riveting. The tabs of each stacked body in the stacked body are connected singly or compositely in the above mode.

According to the utility model discloses a some embodiments are equipped with the buffering bubble cotton between two adjacent lamination bodies, are equipped with the buffering bubble cotton between lamination body and the curb plate. From this, utilize the buffering bubble cotton both can provide fixed pretightning force for the equipment of group battery initial stage, also can use the later stage to absorb electric core bulging force at the group battery.

According to the utility model discloses a some embodiments, can adopt the structure to glue between each soft-packaged electrical core in the pile body, between two adjacent pile bodies, between curb plate and the buffering bubble cotton and the lamination, the thickness that the structure was glued can be 0.05 ~ 0.2mm, for example 0.05mm, 0.1mm, 0.15mm, 0.2mm etc.. This can further improve the structural stability between the members.

Referring to fig. 12, according to some embodiments of the present invention, the battery module further includes: a plurality of strapping bands 600 disposed on the exterior of the side panels and the insulation panels. Utilize the packing area to tie up battery module, can effectively resist the bulging force of inside laminate polymer core, and light in weight, easy realization. In addition, according to the different expansion degrees of the surface expansion areas of the soft package battery core, the packaging belts can be arranged at different positions in a targeted manner.

Referring to fig. 13, according to some embodiments of the present invention, the tab locations at both ends of the lamination body may be further provided with a connection row 700, so that the positive and negative tabs in each lamination body are respectively gathered at the end portion.

In summary, the foldable battery pack according to the embodiment of the present invention has at least one of the following advantages:

1. the battery modules are connected internally, and no conductive additional structures such as copper bars and aluminum bars exist, so that the cost is low and the connection is quick;

2. each soft-packaged battery cell in the stacked body is firstly connected in parallel, then the stacked bodies are connected in series to form a stacked body, and the stacked bodies are connected in series, so that the number of assembled parts is reduced;

3. the battery module is bundled up by a packing belt and used for resisting the expansion force of the soft package battery core. The solution is light in weight and easy to realize;

4. compared with the traditional battery module in which each module is fixed and connected by four bolts, the battery module has the advantages that the bolts and the times for fixing each module are reduced, and the production efficiency is greatly improved;

5. compared with the traditional battery module which needs four bolts for fixing, the space for installation, module expansion and external connection does not need to be reserved among the laminated stacks of the same number of battery cores, and the volume utilization rate of the laminated stacks in a battery system can be greatly improved;

6. through the curb plate through-hole that sets up on the curb plate and the cylinder through-hole on the utmost point ear protective housing, can utilize long screw and nut to connect a plurality of battery module, form large-scale lamination group, improve the space utilization who organizes efficiency and battery package.

Referring to fig. 14, according to some embodiments of the present invention, a battery pack may be manufactured by mounting the battery module of the above-described embodiment in a battery case 900.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. A battery module, comprising: a plurality of sub-modules, each of said sub-modules comprising:

2. The battery module of claim 1, wherein the terminal tab protective housing, the intermediate tab protective housing, and the insulating plate are made of an insulating flame retardant material.

3. The battery module according to claim 1, wherein the length of the battery module is not less than 600 mm.

4. The battery module according to claim 1, wherein the positive electrode connection part and the negative electrode connection part are connected in series by laser welding, ultrasonic welding, or riveting.

5. The battery module of claim 1, wherein the positive and negative electrode connections have structural holes.

6. The battery module of claim 1, wherein the side plates have a ribbed structure with indentations.

7. The battery module according to claim 1, wherein buffering foam is arranged between two adjacent laminated sheets, and buffering foam is arranged between the laminated sheets and the side plates.

8. The battery module of claim 1, further comprising: and the packing belts are arranged outside the side plates and the insulating plates.

9. A battery pack, comprising: the battery module according to any one of claims 1 to 8.

10. A vehicle, characterized by comprising: the battery module according to any one of claims 1 to 8 or the battery pack according to claim 9.