CN106876647B

CN106876647B - Power battery module

Info

Publication number: CN106876647B
Application number: CN201710121198.2A
Authority: CN
Inventors: 李术东; 卢青梅; 彭月猛; 高科; 乔开晓
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2017-03-02
Filing date: 2017-03-02
Publication date: 2020-04-07
Anticipated expiration: 2037-03-02
Also published as: CN106876647A

Abstract

The invention provides a power battery module, which comprises a module BLOCK, a module frame, a module top cover and a module fixing piece, wherein the module frame and the module fixing piece are welded into a whole, an accommodating cavity for accommodating the module BLOCK is formed inside the module frame, the module top cover is welded on the inner side of the module fixing piece, a groove for forming failure protection is arranged at a sealed edge of a tab end face of a battery monomer in the module BLOCK, and a module sampling composite plate for acquiring the temperature and the voltage of the battery monomer in the module BLOCK is arranged between the module top cover and the module BLOCK. According to the invention, the single batteries are connected in series or in parallel by welding, so that the resistance of the battery module is reduced, and low internal resistance inside the module is realized. The voltage sampling row and the temperature sensor are integrated on the module sampling composite board, connection of wire harnesses is reduced, structurally, a lightweight design method is adopted, the sheet metal part is made of lightweight easily-welded materials, the weight of the module is reduced, and the mass energy density of the battery module is improved.

Description

Power battery module

Technical Field

The invention belongs to the field of battery pack accessories, and particularly relates to a power battery module.

Background

With the development of new energy industry, electric vehicles are more and more widely applied. Because the lithium ion battery has the advantages of high energy density, small volume and high power density, the battery unit formed by the lithium ion battery is more and more widely applied to the electric automobile as an energy storage device. Accordingly, the endurance mileage of the electric vehicle and the stability of the battery are more and more concerned, and how to improve the endurance mileage, improve the energy density of the battery and improve the safety of the power battery becomes a key for the development of the electric vehicle in the future.

The power battery module is used as the core of an electric automobile energy system, and the power battery module needs to have higher energy density, so that the electric automobile can effectively run for a longer distance, power must be stably and effectively provided, the problem caused by the failure of a single battery is avoided, and the safety and the reliability of the electric automobile are ensured.

The currently adopted battery pack structure design method has the following disadvantages:

(1) when the voltage and the temperature of the single battery of the battery pack are acquired, the wire harness is complex, occupies a large space, has low space utilization rate and reduces the volume energy density of the battery pack;

(2) the positive and negative electrode lugs are connected through the bolts, holes need to be punched in the lugs, working hours are wasted, the bolts occupy more space, and the energy density of the battery pack is reduced;

(3) the design of structure is more, has taken up more space, has reduced battery module's energy density.

Disclosure of Invention

In view of this, the present invention is directed to a power battery module, in which a bolt connection is replaced by welding, an integration manner is adopted for a wire harness design, a lightweight design method is adopted, a design of a structural member is reduced, a space utilization rate is improved, and a volume energy density and a mass energy density of the battery module are improved.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the utility model provides a power battery module, includes module BLOCK, module frame, module top cap and module mounting, module frame and module mounting weld each other as an organic wholely, inside formation is used for holding the chamber that holds of module BLOCK, the module top cap welds in the inboard of module mounting, the banding of the free utmost point ear terminal surface of battery in the module BLOCK is provided with the recess that is used for forming failure protection, still be provided with the module sampling composite sheet that is used for gathering the free temperature of battery and voltage in the module BLOCK between module top cap and the module BLOCK.

Further, module sampling composite sheet includes sampling board, plug-in components seat, temperature sensor and a plurality of voltage sampling row, the upper edge at the sampling board is installed side by side to the voltage sampling row, the plug-in components seat has still been seted up to the lower limb of sampling board, temperature sensor sets up the temperature that is used for gathering the battery cell utmost point ear on the surface of sampling board.

Further, module BLOCK includes first BLOCK frame, a plurality of battery cell and second BLOCK frame, the battery cell setting is between first BLOCK frame and second BLOCK frame, the main part of first BLOCK frame and second BLOCK frame is first heat dissipation aluminum plate, first heat dissipation aluminum plate's both ends all are provided with the working of plastics, be provided with on the working of plastics and be used for scalding the welding of being connected it with first heat dissipation aluminum plate and detain, the tip of first BLOCK frame and second BLOCK frame still is provided with the location buckle of the installation of being convenient for.

Further, the module top cap is including setting up first module top cap and the second module top cap at module BLOCK both ends respectively, module sampling composite sheet is including setting up first module sampling composite sheet and the second module sampling composite sheet at module BLOCK both ends respectively, first module sampling composite sheet sets up between module BLOCK and first module top cap, second module sampling composite sheet sets up between module BLOCK and second module top cap.

Furthermore, a module slave plate is arranged between the second module top cover and the second module sampling composite plate.

Furthermore, the power battery module further comprises a wire harness and a heat conducting pad, the wire harness transmits the data of the temperature and the voltage collected from the module sampling composite board to the module slave board and transmits the data outwards from the module slave board, and the heat conducting pad is arranged between the single battery and the first module frame.

Further, be provided with first module insulating part between first module sampling composite sheet and the module BLOCK, be provided with second module insulating part between second module top cap and the second module sampling composite sheet, be provided with third module insulating part between second module insulating part and the module BLOCK.

Furthermore, the edge of the second module insulating part is provided with a limiting buckle and a sliding guide rail, and the second module insulating part is connected to the third module insulating part through the sliding rail and is limited through the limiting buckle.

Furthermore, heat-conducting glue is coated between the first BLOCK frame and the single battery and between the single battery and the second BLOCK frame.

Furthermore, a heat-conducting plastic film is arranged between the module slave plate and the second module insulating part, and a second heat-radiating aluminum plate is arranged on the surface, facing the module slave plate, of the second module insulating part.

Compared with the prior art, the power battery module provided by the invention has the following advantages:

the power battery module is connected with the single batteries in series or in parallel by welding, so that the resistance of the battery module is reduced, and low internal resistance inside the module is realized. The voltage sampling row and the temperature sensor are integrated on the sampling plate, connection of a wiring harness is reduced, and structurally, a lightweight design method is adopted, the sheet metal part is made of lightweight easily-welded materials, the weight of the module is reduced, and the mass energy density of the battery module is improved. The module sampling composite sheet of design, BLOCK frame etc. have integrated function, have saved the module space, have improved space utilization, have promoted the volume energy density of battery module. These measures all indirectly prolong the endurance mileage of the electric automobile. The integration of the structural member reduces the working procedures and shortens the working hours for the battery factory, thereby being beneficial to batch production. The structural design of the single battery prevents the single battery from losing efficacy, and the safety of the battery module is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a power battery module according to an embodiment of the invention;

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

fig. 3 is an exploded view of a module BLOCK in the power battery module according to the embodiment of the invention;

fig. 4 is an exploded view of a module sampling composite plate in a power battery module according to an embodiment of the invention.

Description of reference numerals:

1-module BLOCK; 2-a first module frame; 3-a first module insulator; 4-a first module sampling composite board 1; 5-a first module top cover; 6-first module fixing piece; 7-a first screw; 8-a second module frame; 9-a second screw; 10-second module fixing member; 11-a second module top cover; 12-a modular slave plate; 13-a second module insulator; 14-a second module sampling composite board; 15-a third module insulator; 16-a wire harness; 17-a thermally conductive pad; 131-a limit buckle; 132-a glide rail; 101-a first BLOCK frame; 102-a single battery; 103-a second BLOCK frame; 1011-a first heat dissipating aluminum plate; 1012-plastic parts; 1013-ironing and welding buttons; 1014-positioning fasteners; 1021-fail safe; 141-a sampling plate; 142-a plug-in seat; 143-temperature sensor; 144-voltage sample rows.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "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 used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. 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," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1, the overall housing of the power battery module is connected into a whole by welding, the first module fixing piece 6 and the first module top cover 5 are welded and positioned, and the second module fixing piece 10 and the second module top cover 11 are welded and positioned into a whole with the second module frame 8, so that the mounting accuracy is improved.

As shown in fig. 2, the power battery module of the present invention is composed of a plurality of (four to eight) module BLOCKs 1, a first module frame 2, a first module insulator 3, a first module sampling composite board 4, a first module top cover 5, a first module fixing member 6, a first screw 7, a second module frame 8, a second screw 9, a second module fixing member 10, a second module top cover 11, a module slave board 12, a second module insulator 13, a second module sampling composite board 14, a third module insulator 15, a wire harness 16, and a thermal pad 17.

A plurality of (four to eight) module BLOCK1 arrange the main part of constituteing the power battery module together, and its both ends link into an integrated entity through first module insulator 3 and third module insulator 15, have cancelled traditional drift bolt fixed knot and have constructed, have saved the space, have improved space utilization. The second module insulator 13 is connected to the third module insulator 15 through the sliding rail 132, and slides to a certain position to be limited by the limiting buckle 131, thereby limiting the degree of freedom of the second module insulator 13.

The module slave plate 12 is screwed between the second module top cover 11 and the second module insulator 13. Preferably, the module is provided with a layer of heat-conducting plastic film (not shown in the figure) between the plate 12 and the second module insulator 13, a second heat-dissipating aluminum plate (not shown in the figure) is embedded in the surface of the second module insulator 13, and the heat generated by the module from the plate 12 is transferred to the second heat-dissipating aluminum plate through the heat-conducting plastic film to dissipate the heat.

Then, the wiring harness 16, the heat conducting pad 17 and the first module frame 2 are sequentially installed, the wiring harness 16 conveys the collected voltage and temperature to the module slave plate 12, and the module slave plate 12 communicates outwards. The first module top cover 5 and the second module top cover 11 are arranged on two sides of the first module frame 2, the first module insulator 3 is arranged on the inner side of the first module top cover 5 through screws, the third module insulator 15 is arranged on the inner side of the second module top cover 11, then the second module frame 8 is arranged on the upper surface of the first module frame 2, and the second module insulator 13 is connected between the second top cover 11 and the third module insulator 15 through screws. And finally, a second module fixing piece 10 is installed, and the second module fixing piece 10 and the second module frame 8 are welded into a whole, so that the rigidity and the strength of the power battery module are improved, and the stress and the deformation of the power battery module are reduced.

Specifically, as shown in fig. 3, module BLOCK1 comprises first BLOCK frame 101, two battery cells 102 and second BLOCK frame 103, and first BLOCK frame 101 and second BLOCK frame 103 all comprise working of plastics 1012 and first heat dissipation aluminum plate 1011, and the design has boiling hot welding button 1013 on working of plastics 1012, and it is a whole to weld working of plastics 1012 and first heat dissipation aluminum plate 1011 with boiling hot welding process, and design has location buckle 1014 on first BLOCK frame 101, and the manipulator can accurate location installation.

Specifically, all be coated with the heat conduction between first BLOCK frame 101, two battery cells 102 and the second BLOCK frame 103 and glue, the heat conduction glues the function that has the structure concurrently and glues, can make the effectual linking as an organic whole that links up of module BLOCK1, and the heat in the battery also can pass through the heat conduction glue and spread first heat dissipation aluminum plate 1011 on, has avoided the influence of air.

More specifically, red and black or "+" - "is marked on both ends of the heat dissipating aluminum plate 1011 to mark the positive and negative electrodes of the unit battery, so as to avoid the positive and negative electrodes from being reversed during installation.

Through analysis and test, a part of material is removed on the edge sealing of the end face of the lug of the single battery 102 to form a groove, failure protection 1021 is made, the performance of the battery is not affected, if the battery fails, the single battery is enabled to fail at the position firstly, and the single battery is prevented from expanding in the width direction, so that the safety of the battery module is improved.

As shown in fig. 2, the first modular sampling composite plate 4 is installed between the first modular insulator 3 and the first cap 5, and the second modular sampling composite plate 14 is installed between the second modular insulator 13 and the third modular insulator 15.

Specifically, as shown in fig. 4, the first modular sampling composite board 4 and the second modular sampling composite board 14 both have the same design and are composed of a sampling board 141, a plug-in socket 142, a temperature sensor 143, and a voltage sampling row 144. The voltage sampling row 144 can collect the voltage of the single battery 102, and also connect the tab of the battery, and the batteries are connected in series or in parallel by welding, so that the resistance is reduced, and the low resistance inside the module is realized. The form of the voltage sampling row 144 is not limited to this design structure. Temperature sensor 143 can gather the temperature of battery tab, and voltage sampling signal is integrated on the sampling board, has reduced the output of pencil, has improved space utilization, has promoted the volume energy density of group battery.

The structure of the invention adopts a lightweight design method, and the sheet metal part adopts lightweight easily-welded materials, so that the weight of the module is reduced, and the mass energy density of the battery module is improved. The module sampling composite sheet of design, BLOCK frame etc. have integrated function, have saved the module space, have improved space utilization, have promoted the volume energy density of battery module. These measures all indirectly prolong the endurance mileage of the electric automobile. The integration of the structural member reduces the working procedures and shortens the working hours for the battery factory, thereby being beneficial to batch production. From the security, the structural design of battery cell has prevented battery cell's inefficacy, is favorable to the safety and stability of battery module.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a power battery module which characterized in that: the power battery module comprises a module BLOCK, a module frame, a module top cover and a module fixing piece, wherein the module frame and the module fixing piece are welded into a whole, an accommodating cavity for accommodating the module BLOCK is formed inside the module frame, the module top cover is welded on the inner side of the module fixing piece, a groove for forming failure protection is formed in a sealed edge of a pole ear end face of a battery monomer in the module BLOCK, and a module sampling composite plate for acquiring the temperature and the voltage of the battery monomer in the module BLOCK is arranged between the module top cover and the module BLOCK; the module sampling composite plate comprises a sampling plate, an insert seat, a temperature sensor and a plurality of voltage sampling rows, wherein the voltage sampling rows are arranged on the upper edge of the sampling plate side by side, the lower edge of the sampling plate is also provided with the insert seat, and the temperature sensor is arranged on the surface of the sampling plate and used for collecting the temperature of a single battery tab;

the module top cover comprises a first module top cover and a second module top cover which are respectively arranged at two ends of the module BLOCK, the module sampling composite board comprises a first module sampling composite board and a second module sampling composite board which are respectively arranged at two ends of the module BLOCK, the first module sampling composite board is arranged between the module BLOCK and the first module top cover, and the second module sampling composite board is arranged between the module BLOCK and the second module top cover;

a module slave plate is arranged between the second module top cover and the second module sampling composite plate;

the power battery module further comprises a wire harness and a heat conducting pad, the wire harness transmits data of temperature and voltage collected from the module sampling composite board to the module slave board and transmits the data outwards from the module slave board, and the heat conducting pad is arranged between the battery monomer and the module frame.

2. The power battery module of claim 1, wherein: the module BLOCK includes first BLOCK frame, a plurality of battery cell and second BLOCK frame, the battery cell sets up between first BLOCK frame and second BLOCK frame, the main part of first BLOCK frame and second BLOCK frame is first heat dissipation aluminum plate, first heat dissipation aluminum plate's both ends all are provided with the working of plastics, be provided with on the working of plastics and be used for scalding that it is connected with first heat dissipation aluminum plate and weld the knot, the tip of first BLOCK frame and second BLOCK frame still is provided with the location buckle of the installation of being convenient for.

3. The power battery module of claim 1, wherein: be provided with first module insulating part between first module sampling composite sheet and the module BLOCK, be provided with second module insulating part between second module top cap and the second module sampling composite sheet, be provided with third module insulating part between second module insulating part and the module BLOCK.

4. The power battery module of claim 3, wherein: the edge of the second module insulating part is provided with a limiting buckle and a sliding guide rail, and the second module insulating part is connected to the third module insulating part through the sliding rail and is limited through the limiting buckle.

5. The power battery module of claim 2, wherein: and heat-conducting glue is coated between the first BLOCK frame and the single battery and between the single battery and the second BLOCK frame.

6. The power battery module of claim 3, wherein: be provided with heat conduction plastic film between module slave plate and the second module insulating part, the surface of second module insulating part towards the module slave plate is provided with second heat dissipation aluminum plate, heat conduction plastic film set up between second module insulating part and second heat dissipation aluminum plate.