CN115425373A

CN115425373A - Battery module and electric automobile

Info

Publication number: CN115425373A
Application number: CN202211124704.0A
Authority: CN
Inventors: 朱立宾; 周坤; 吴杰余; 刘爽; 陈玉龙
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2022-12-02

Abstract

The utility model relates to an electric automobile technical field provides a battery module and electric automobile, the battery module includes the casing, the apron, a plurality of electric cores and sampling conducting layer, the casing is formed with hold the chamber and with the installing port that holds the chamber intercommunication, the apron is used for the lid to close the installing port, a plurality of electric cores hold locate and hold the chamber, the at least part of sampling conducting layer sets up in the internal surface of apron, the sampling conducting layer is connected with the sampling point electricity of a plurality of electric cores, in order to be used for the voltage sampling. Utilize the apron to provide fixed position for the sampling conducting layer, can avoid the wiring confusion that the voltage sampling pencil in the correlation technique caused, avoid the misconnection or miss the safety problem who connects the initiation.

Description

Battery module and electric automobile

Technical Field

The application relates to the technical field of electric automobiles, in particular to a battery module and an electric automobile.

Background

The battery system of the electric automobile comprises a battery module, a battery management system, a high-voltage distribution system and the like, wherein the battery module is formed by connecting a plurality of battery cores in series and in parallel. The battery management system collects voltage signals of all the battery cores to carry out threshold management and fault protection strategies in the driving or charging process of the electric automobile. Therefore, the stability and reliability of the voltage sampling loop for acquiring the voltage sampling signal of the battery cell are one of the key technologies to be solved.

In the related art, a voltage sampling signal of the battery module is welded with the battery core through a voltage sampling wire harness, the voltage sampling wire harness is welded to an output connector of the battery module to achieve voltage signal transmission, and the assembly difficulty of the sampling wire harness is large.

Disclosure of Invention

In view of this, the present application is expected to provide a battery module and an electric vehicle capable of reducing the assembly difficulty.

The application provides a battery module in one aspect for electric automobile includes:

the shell is provided with an accommodating cavity and an installation opening communicated with the accommodating cavity;

the cover plate is used for covering the mounting opening;

the battery cells are accommodated in the accommodating cavities;

the sampling conducting layer is at least partially arranged on the inner surface of the cover plate and is electrically connected with a plurality of sampling points of the battery cell for voltage sampling.

In some embodiments, a portion of the sampling conductive layer is embedded in the inner surface of the cover plate.

In some embodiments, the cover plate is configured as an injection molded part injection molded from molten feedstock material on the sampling conductive layer.

In some embodiments, the sampling conductive layer includes a plurality of mutually isolated electrical traces, each of the electrical traces includes a sampling portion and a main body portion, the main body portion is disposed on the inner surface of the cover plate, and the sampling portion extends from the main body portion to the location of the sampling point so as to be electrically connected to the sampling point.

In some embodiments, the electrical trace includes a pin portion connected to an end of the main body portion away from the sampling portion, and the pin portion is located outside the accommodating cavity.

In some embodiments, the needle insertion portion includes a vertical section and a horizontal section, an upper end of the vertical section is connected to an end of the body portion away from the sampling portion, and the horizontal section extends from a lower end of the vertical section in a horizontal direction.

In some embodiments, the battery module includes a protective cover connected to the cover plate, one side of the protective cover in the horizontal direction is opened to form an insertion port, the vertical section and the horizontal section are both located in the protective cover, and the horizontal section is located at the insertion port.

In some embodiments, the electrical traces are spaced apart and extend in parallel.

In some embodiments, the battery module comprises a tightening device, and the tightening device provides acting force to make the sampling conductive layer and the sampling point keep conductive contact.

In some embodiments, the fastening device comprises a locking member and an elastic member, the locking member is connected with the cover plate, the elastic member contacts with the locking member and the sampling part of the sampling conducting layer, the locking member forces the elastic member to elastically deform, and the elastic force of the elastic member enables the sampling part to keep conductive abutting with the sampling point.

In some embodiments, the retaining member is removably coupled to the cover plate.

In some embodiments, the cover plate is formed with an access opening, the access opening being located where the sampling point is located.

Another aspect of the present application provides an electric vehicle, including:

a vehicle body;

the battery module of any one of the above claims, disposed on the vehicle body.

The battery module that this application embodiment provided utilizes the sampling conducting layer to carry out voltage sampling to electric core, and the voltage sampling signal transmission that the sampling conducting layer will obtain from electric core is to battery management system. At least part with the sampling conducting layer sets up in the internal surface of apron, utilize the apron to provide fixed position for the sampling conducting layer, the sampling conducting layer is difficult to the aversion, the sampling conducting layer can aim at with the sampling point fast, not only can avoid the wiring confusion that the voltage sampling pencil among the correlation technique caused, avoid misconnection or neglected to meet the safety problem that causes, can also save pencil ligature step, simplify the installation procedure, the assembly efficiency of battery module has been promoted, and the fault rate of misconnection or neglected to meet has been reduced. The cost of sampling conducting layer is compared and is lower in voltage sampling pencil and flexible circuit board, can effectively reduce the raw materials cost of battery module.

Drawings

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

fig. 2 is an exploded view of the battery module of fig. 1;

fig. 3 is an exploded view illustrating a partial structure of the battery module shown in fig. 1;

FIG. 4 is a schematic structural diagram of a fastening device and a sampling conductive layer according to an embodiment of the present application;

FIG. 5 is an enlarged partial schematic view of the structure shown in FIG. 3;

fig. 6 is a partial schematic view of the fastening device, the electrical traces and the connecting pads according to an embodiment of the disclosure.

Description of the reference numerals

A housing 100;

a cover plate 200; a stud 210;

an electric core 300; sample point 300a; a connecting piece 310;

the conductive layer 400 is sampled; an electrical trace 410; a sampling section 411; a main body portion 412; a pin part 413; a vertical section 4131; a horizontal section 4132;

a protective cover 500; a socket 500a;

a tightening device 600; a retaining member 610; an elastic member 620;

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

In the embodiments of the present application, the "up" and "down" orientations or positional relationships are orientations or positional relationships based on normal use of the battery module, and it should be understood that these orientation terms are only for convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. The present application will now be described in further detail with reference to the accompanying drawings and specific examples.

In the related art, the existing battery module mainly comprises a lower shell, an insulating part, a plurality of battery cores, a conductive connecting part, a voltage sampling wire harness, a cover plate, an output connector and the like. The battery module structure is characterized in that a plurality of battery cores and insulators are assembled firstly and then installed in the lower shell to form a battery module structure body, conductive connecting pieces are installed on the positive and negative electrodes of the battery cores to be electrically connected in series and in parallel, voltage sampling wire harnesses are installed to be respectively welded on the battery cores and output connectors to complete electric connection of battery core voltage sampling, the output connectors are used for being connected with external connecting terminals in an inserting mode to transmit voltage sampling signals to a battery management system, and finally cover plates are installed to complete installation of the battery module.

In the above-mentioned assembly of the existing battery module, when the voltage sampling harness in the battery module is installed, the series connection and the parallel connection between the electric cores in the battery module are already completed, a higher voltage is established, and in order to install the voltage sampling harness, the electric core pole column and the electric conductor must be exposed and uncovered, so as to ensure that the electric connection and the wiring of the voltage sampling harness are assembled as required, thus, the operation of installing the voltage sampling harness is risky. And each battery cell needs to realize voltage signal acquisition through two voltage sampling lines, and when the number of the battery cells is large, the number of the corresponding voltage sampling lines is increased, so that the voltage sampling wire harness is easily misconnected or misconnected. After the voltage sampling wire harness is installed, in order to prevent the situation that the voltage sampling wire harness shakes to cause unreliable electric connection and fracture when the vehicle runs, the voltage sampling wire harness still needs to be firmly tied up with the battery module structure body, and the installation process is multiple and complicated.

On the other hand, in the related art, the voltage sampling wire harness is replaced by a flexible circuit board, that is, the flexible circuit board is respectively welded with the battery core and the output connector, so that the transmission of the voltage sampling signal is realized. The flexible circuit board is structurally divided into a single-layer board and a double-layer board, and the voltage sampling wire harness can be arranged upwards or downwards based on the structural design of the battery module. And in order to be electrically connected with the contact pin in the output connector of the battery module, the end part of the flexible circuit board is bent, and the flexible circuit board is ensured to be welded with the output connector, so that a voltage signal is transmitted. The flexible circuit board has a high manufacturing cost, and if a double-layer flexible circuit board is adopted, the cost of the design parts of the flexible circuit board is further increased. In addition, the sampling line of the flexible circuit board and the electric conductor of the battery core are fixed together in a laser welding mode, large-scale laser welding equipment needs to be input, different welding tools need to be adapted and welding parameters need to be debugged for different schemes of series-parallel battery modules, and therefore a large amount of labor and material cost needs to be input.

The embodiment of the application provides a battery module for electric automobile.

Referring to fig. 1, 2, 3 and 6, the battery module includes a housing 100, a cover plate 200, a plurality of battery cells 300 and a sampling conductive layer 400. The housing 100 is formed with a housing chamber and a mounting port communicating with the housing chamber. The cover plate 200 is used to cover the mounting opening. A plurality of cells 300 are accommodated in the accommodation cavity. At least a portion of the sampling conductive layer 400 is disposed on the inner surface of the cap plate 200. The sampling conductive layer 400 is electrically connected to the sampling points 300a of the plurality of battery cells 300 for voltage sampling. Specifically, the sampling conductive layer 400 refers to a structural layer having a conductive function.

The battery module that this application embodiment provided utilizes sampling conducting layer 400 to carry out voltage sampling to electric core 300, and sampling conducting layer 400 will follow the voltage sampling signal transmission that electric core 300 acquireed to battery management system. At least part of conducting layer 400 that will sample sets up in the internal surface of apron 200, utilize apron 200 to provide fixed position for sampling conducting layer 400, sampling conducting layer 400 is difficult to shift, sampling conducting layer 400 can aim at with sampling point 300a fast, not only can avoid the wiring confusion that the voltage sampling pencil in the correlation technique caused, avoid the misconnection or miss the safety problem that causes, can also save pencil ligature step, simplify the installation procedure, the assembly efficiency of battery module has been promoted, and the fault rate of misconnection or miss is reduced. The cost of the sampling conductive layer 400 is lower than that of a voltage sampling harness and a flexible circuit board, and the raw material cost of the battery module can be effectively reduced.

The cap plate 200 may serve as a protection plate, and the cap plate 200 may be made of an insulating material. Illustratively, the cover plate 200 is made of a non-metallic material such as plastic.

In one embodiment, referring to fig. 4, the sampling conductive layer 400 is made of a conductive material. Thus, the sampling conductive layer 400 has a simple structure and is easy to manufacture.

For example, in one embodiment, referring to fig. 4, the sampling conductive layer 400 includes a plurality of mutually isolated electrical traces 410. The electrical trace 410 is constructed of an electrically conductive material.

In one embodiment, the conductive material comprises copper foil. The copper foil has low cost and good conductivity.

In one embodiment, a portion of the sampling conductive layer 400 is embedded in the inner surface of the cover plate 200. That is, at least part of the sampling conductive layer 400 is embedded in the cover plate 200. Illustratively, the inner surface of the cover plate 200 is formed with a groove, and a portion of the sampling conductive layer 400 is accommodated in the groove and attached to the groove wall surface of the groove. Thus, the sampling conductive layer 400 is mounted with high stability, so that the sampling conductive layer 400 has good shock resistance, safety, and reliability.

For example, in an embodiment, the groove includes a plurality of sub-grooves isolated from each other, and the electrical trace 410 is accommodated in the sub-grooves and attached to the groove wall surfaces of the sub-grooves.

The specific manner of fixing at least part of the sampling conductive layer 400 to the inner surface of the cap plate 200 is not limited, and for example, in some embodiments, at least part of the sampling conductive layer 400 may be fixed to the inner surface of the cap plate 200 by gluing or the like.

In one embodiment, the cover plate 200 is configured as an injection molded part that is injection molded from molten raw material on the sampling conductive layer 400. Specifically, the sampling conductive layer 400 is placed in a cavity, a molten raw material is injected into the cavity, and the cover plate 200 is formed after the molten raw material is cooled and molded. So, on the one hand, apron 200 adopts the plastics material, and insulating nature is good, can provide the guard action. On the other hand, the injection molding process is convenient for the sampling conductive layer 400 and the cover plate 200 to be consolidated into a whole, the molten raw material can fully fill the gaps between the electric wires 410, not only can the electric wires 410 not be in contact with each other to cause short circuit, but also can ensure that the assembly stability between the sampling conductive layer 400 and the cover plate 200 is better, and reduce the assembly steps between the sampling conductive layer 400 and the cover plate 200.

The material of the cover plate 200 is not limited, that is, the material of the molten raw material is not limited, and the material of the cover plate 200 includes, but is not limited to, polybutylene Terephthalate (PBT) and/or Glass Fiber (GF). PBT has good chemical resistance, and GF has high strength, high modulus and low cost.

In an embodiment, referring to fig. 3, 4 and 6, the sampling conductive layer 400 includes a plurality of mutually isolated electrical traces 410, the electrical traces 410 include a sampling portion 411 and a main body portion 412, the main body portion 412 is disposed on the inner surface of the cover plate 200, and the sampling portion 411 extends from the main body portion 412 to the position of the sampling point 300a to be electrically connected to the sampling point 300a. Illustratively, the main body part 412 is embedded in the inner surface of the cover plate 200, and the sampling part 411 extends from the main body part 412 to the position of the sampling point 300a. The sampling part 411 may be substantially cantilever-shaped, that is, the sampling part 411 may not be fixed to the cover plate 200. Thus, the sampling part 411 is electrically connected to the sampling point 300a.

It is understood that the isolation of the electrical traces 410 refers to: the individual electrical traces 410 are not in contact with each other at once.

The plurality of battery cells 300 may be connected in series and/or in parallel. Illustratively, in some embodiments, the cells 300 are configured with a connecting tab 310, the connecting tab 310 electrically connecting two cells 300. That is, the series connection and/or the parallel connection between the plurality of battery cells 300 is achieved by the connection sheet 310.

The battery cell 300 has a positive electrode tab and a negative electrode tab, and the connecting sheet 310 is connected to the positive electrode tab or the negative electrode tab of the battery cell 300. A sample point 300a for a cell may be formed on tab 310, for example, electrical trace 410 may be electrically connected to sample point 300a of tab 310 to form a voltage sampling loop.

It is understood that the connection tabs 310 are located at the upper side of the battery cell 300, and the sampling points 300a are located at the upper surface of the connection tabs 310. In this manner, sampling conductive layer 400, such as electrical trace 410, is electrically connected to bond pad 310.

The sampling point 300a may be a conductive connection point of the connection tab 310 and the battery cell 300.

The battery module of the present application is exemplarily described below by taking 4 cells 300 connected in series as an example, please refer to fig. 2 to 6, wherein 4 cells 300 are connected in series through 5 connecting sheets 310, and the sampling conductive layer 400 includes 5 electrical traces 410. For convenience of description, the 4 cells 300 are respectively defined as a first cell 300, a second cell 300, a third cell 300, and a fourth cell 300, and the 5 electrical traces 410 are respectively defined as a first electrical trace 410, a second electrical trace 410, a third electrical trace 410, a fourth electrical trace 410, and a fifth electrical trace 410. The first electrical trace 410 is electrically connected to the total negative connection pad 310 of the first cell 300, the second electrical trace 410 is electrically connected to the total positive connection pad 310 of the first cell 300 and the total negative connection pad 310 of the second cell 300, the third electrical trace 410 is electrically connected to the total positive connection pad 310 of the second cell 300 and the total negative connection pad 310 of the third cell 300, the fourth electrical trace 410 is electrically connected to the total positive connection pad 310 of the third cell 300 and the total negative connection pad 310 of the fourth cell 300, and the fifth electrical trace 410 is electrically connected to the total positive connection pad 310 of the fourth cell 300. Thus, a voltage sampling loop is realized.

It is to be understood that the above description is only an example of the present application, and does not represent that the number of the battery cells 300 of the present application is 4, nor represents that a plurality of battery cells 300 of the present application are connected in series. The battery cell 300 of the present application includes two or more. The plurality of battery cells 300 may be connected in series and/or in parallel. It should be noted that, other connection manners except the above connection manner may also be adopted between the electrical trace 410 and the connection sheet 310, the single battery cell 300 has a positive electrode tab and a negative electrode tab, the positive electrode tabs and the negative electrode tabs of the multiple battery cells 300 are electrically connected by the connection sheet 310, and the electrical trace 410 and the connection sheet 310 are electrically connected to form a voltage sampling loop.

In an embodiment, referring to fig. 2 to 4, the electrical trace 410 includes a pin portion 413, the pin portion 413 is connected to an end of the main body portion 412 away from the sampling portion 411, and the pin portion 413 is located outside the accommodating cavity. Specifically, the pin part 413 is used to be plugged with an external connection terminal to transmit the voltage sampling signal to a Battery Management System (BMS). That is to say, in this application, the contact pin of the output connector in the related art is also prepared to the electric wire 410, replaces the traditional connector form in the related art, omits the output connector of the battery module in the related art, simplifies the structure, has higher flexibility, can adjust the number of the electric wire 410 according to the number of the electric cores 300, can adjust the number of the contact pin portions 413, reduces the situation of the vacant contact pin, and further reduces the material cost.

In one embodiment, referring to fig. 2 to 4, the pin portion 413 includes a vertical portion 4131 and a horizontal portion 4132, the upper end of the vertical portion 4131 is connected to an end of the body portion 412 away from the sampling portion 411, the horizontal portion 4132 extends horizontally from the lower end of the vertical portion 4131, and the horizontal portion 4132 is used for being plugged with an external connection terminal. Specifically, the vertical section 4131 is disposed vertically. Thus, one end of the electrical trace 410 is rolled into the pin portion 413, and the external connection terminal is inserted into the horizontal segment 4132 along the horizontal direction, so that the insertion fit between the external connection terminal and the horizontal segment 4132 is more stable and tight.

In one embodiment, referring to fig. 2 to 4, the line width of the sampling portion 411, the line width of the main portion 412, the line width of the vertical segment 4131 and the line width of the horizontal segment 4132 are all the same. That is, the cross-sectional size of the sampling part 411, the cross-sectional size of the main body part 412, the cross-sectional size of the vertical section 4131, and the cross-sectional size of the horizontal section 4132 are all the same. Thus, the horizontal segment 4132 of the integrated electrical trace 410 can be adapted to the existing external connection terminal product, and a compatible design is achieved.

In one embodiment, referring to fig. 1 to 3, the battery module includes a protective cover 500 connected to the cover plate 200, one side of the protective cover 500 is opened along a horizontal direction to form a socket 500a, the vertical section 4131 and the horizontal section 4132 are both located in the protective cover 500, and the horizontal section 4132 is located at the socket 500 a. As such, the connector can be mated with horizontal segment 4132 through mating interface 500 a. The protective cover 500 can protect the pin portion 413 from other objects contacting the pin portion 413.

The protective cover 500 may be formed integrally with the cap plate 200. For example, the protective cover 500 and the cap plate 200 are an integral injection molding structure. Thus saving the manufacturing process.

The electrical trace 410 may be an integrally formed structure, that is, the main body portion 412, the sampling portion 411 and the pin portion 413 are integrally formed.

In one embodiment, referring to fig. 1 to 3, the cover plate 200 is detachably connected to the housing 100. Illustratively, the cover plate 200 and the housing 100 are coupled by screws or bolts.

In one embodiment, referring to fig. 2 to 4, the electrical traces 410 are arranged at intervals and extend in parallel. That is, the pitch between two adjacent electrical traces 410 remains the same along the extending direction of the electrical traces 410. In this way, the electrical traces 410 are compact. The operator can conveniently position and assemble the electric wire 410 to the preset position of the cover plate 200 quickly, and the assembly difficulty is reduced.

In an exemplary embodiment, referring to fig. 1 to 6, the battery module includes a tightening device 600, and the tightening device 600 provides a force to make the sampling conductive layer 400 electrically contact with the sampling point 300a.

In the related art, the voltage sampling wire harness and the flexible circuit board are both welded with the battery cell 300, the series connection and the parallel connection between the battery cells 300 in the battery module are completed, higher voltage is established, the safety risk in the welding process is large, large-scale laser welding equipment is required to be input, different welding tools are required to be adapted and welding parameters are required to be debugged for different series-parallel connection schemes of the battery module, and therefore a large amount of manpower and material resource cost is required to be input.

In this embodiment, compared to the welding form in the related art, the tight abutting device 600 keeps the sampling conductive layer 400 and the sampling point 300a in conductive abutting, for example, the cover plate 200 may be installed to a set position, i.e., the sampling conductive layer 400 may be aligned to the sampling point 300a, and an operator may operate the tight abutting device 600 to keep the sampling conductive layer 400 and the sampling point 300a in conductive abutting, which may not only greatly reduce the operation safety risk of the operator, reduce the complicated welding processes and the corresponding equipment requirements, greatly reduce the investment of related costs, solve the problem of internal resistance increase caused by the difference of the welding area and the contact surface, but also ensure reliable connection between the sampling conductive layer 400 and the connection sheet 310, reduce the connection resistance, and improve the precision and stability of the voltage sampling loop.

In one embodiment, referring to fig. 1 to 6, the fastening device 600 includes a locking member 610 and an elastic member 620, the locking member 610 is connected to the cover plate 200, the elastic member 620 contacts the locking member 610 and the sampling portion 411 of the sampling conductive layer 400, the locking member 610 forces the elastic member 620 to elastically deform, and the elastic force of the elastic member 620 makes the sampling portion 411 electrically contact with the sampling point 300a. Illustratively, the sampling portion 411 is cantilevered, and the elastic force of the elastic member 620 makes the sampling portion 411 abut against the sampling point 300a. In this manner, the electrical connection between the sampling conductive layer 400 and the sampling part 411 is achieved. So, make sampling portion 411 and sampling point 300a keep electrically conductive butt through elasticity tension force, realize voltage sampling signal transmission, have higher commonality, flexibility and assembly convenience.

In one embodiment, the retaining member 610 is removably coupled to the cover plate 200. Illustratively, retaining member 610 is threaded, screwed, bolted, snapped, etc. with cover plate 200. Thus, the locking member 610 and the elastic member 620 can be easily attached and detached.

In one embodiment, referring to fig. 1-3, the locking member 610 is threadably connected to the cover plate 200. Illustratively, the cap plate 200 is formed with a stud 210, one of the locker 610 and the stud 210 is formed with an internal thread, and the other of the locker 610 and the stud 210 is formed with an external thread, and the internal thread is threadedly engaged with the external thread. Screw up retaining member 610 through rotating and can be with retaining member 610 rapid Assembly to apron 200 on, can also effectively drive elastic component 620 and take place elastic deformation, easy operation at the in-process of screwing up retaining member 610.

In one embodiment, referring to fig. 3, the elastic member 620 is a coil spring, the locking member 610 includes a blocking plate and a circular rim with two axial ends open, the blocking plate closes one end of the circular rim, the circular rim forms an external thread or an internal thread, and the elastic member 620 is accommodated in the circular rim. In this way, the baffle can contact the elastic member 620 to drive the elastic member 620 to deform, and the space in the annular edge can limit the elastic member 620 from shifting.

In one embodiment, the cover plate 200 is formed with an access opening, which is located at the sampling point 300a. The service opening is used to service the sampling conductive layer 400 and/or the sampling point 300a. For example, the operator can observe the sampling conductive layer 400, i.e., the voltage sampling circuit, the connecting sheet 310, i.e., the high-voltage connecting line, etc., through the access opening without detaching the cover plate 200, and can also measure the relevant parameters of the battery cell 300, the sampling conductive layer 400, i.e., the voltage sampling circuit, the connecting sheet 310, i.e., the high-voltage connecting line, etc., through the access opening by using a measuring tool, thereby realizing rapid diagnosis and maintenance.

It should be noted that retaining member 610 can be an insulative structure, for example, retaining member 610 can be made of an insulative material. Illustratively, the retaining member 610 is a non-metallic material such as plastic.

The resilient member 620 may be made of metallic or non-metallic members.

In one embodiment, referring to fig. 1-3, the stud 210 surrounds the periphery of the access opening. Specifically, the elastic member 620 is inserted into the access hole. Thus, the access opening can be used for both the access structure and the limiting elastic element 620. The locking member 610 can be used for driving the elastic member 620 to elastically deform and can also be used for shielding an access hole, so that the purpose of dual purposes is achieved.

The embodiment of the application still provides an electric automobile, and electric automobile includes automobile body and the battery module in this application arbitrary embodiment, and the battery module sets up on the automobile body. The battery module is used for providing the electric energy of automobile body motion.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a battery module for electric automobile, its characterized in that includes:

the cover plate is used for covering the mounting opening;

the battery cells are accommodated in the accommodating cavities;

2. The battery module according to claim 1, wherein a portion of the sampling conductive layer is embedded in an inner surface of the cap plate.

3. The battery module according to claim 2, wherein the cap plate is configured as an injection-molded member that is injection-molded from a molten raw material on the sampling conductive layer.

4. The battery module according to claim 1, wherein the sampling conductive layer comprises a plurality of mutually isolated electrical traces, each electrical trace comprises a sampling portion and a main body portion, the main body portion is disposed on the inner surface of the cover plate, and the sampling portion extends from the main body portion to the sampling point to be electrically connected with the sampling point.

5. The battery module according to claim 4, wherein the electrical trace comprises a pin portion, the pin portion is connected to an end of the main body portion away from the sampling portion, and the pin portion is located outside the accommodating cavity.

6. The battery module according to claim 5, wherein the pin part comprises a vertical section and a horizontal section, an upper end of the vertical section is connected to an end of the main body part remote from the sampling part, and the horizontal section extends from a lower end of the vertical section in a horizontal direction.

7. The battery module according to claim 6, wherein the battery module comprises a protective cover connected with the cover plate, one side of the protective cover in the horizontal direction is opened to form a plug interface, the vertical section and the horizontal section are both positioned in the protective cover, and the horizontal section is positioned at the plug interface.

8. The battery module according to claim 4, wherein the electrical traces are spaced apart and extend in parallel.

9. The battery module according to claim 1, wherein the battery module comprises a tightening device which provides a force to keep the sampling conductive layer in conductive abutment with the sampling points.

10. The battery module according to claim 9, wherein the tightening device comprises a locking member and an elastic member, the locking member is connected with the cover plate, the elastic member contacts with the locking member and the sampling portion of the sampling conductive layer, the locking member forces the elastic member to elastically deform, and the elastic force of the elastic member makes the sampling portion and the sampling point keep conductive abutment.

11. The battery module as set forth in claim 10, wherein the locking member is detachably coupled to the cap plate.

12. The battery module according to any one of claims 1 to 11, wherein the cover plate is formed with an access opening at which the sampling point is located.

13. An electric vehicle, comprising:

a vehicle body;

the battery module according to any one of claims 1 to 12, which is mounted on the vehicle body.