KR20170043928A - Battery module and fabricating method thereof - Google Patents

Abstract

Provided are a battery module and a fabricating method thereof, having a strong electrical connection part between a secondary battery and a voltage sensing module against vibration or shock, and simplifying the assembling process of electrically connecting the secondary battery and the voltage sensing module. The battery module according to the present invention includes: a plurality of secondary batteries having electrode leads; and a voltage sensing module including a PCB electrically connected to the electrode lead to sense a voltage of the secondary battery. A conductive rubber is used to electrically connect the electrode lead and the PCB.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery module and a manufacturing method thereof,

The present invention relates to a battery module and a method of manufacturing the same, and more particularly, to a battery module to which a voltage sensing structure for a plurality of secondary batteries is applied, a manufacturing method thereof, and a battery pack including such a battery module.

2. Description of the Related Art In recent years, demand for portable electronic products such as notebook computers, video cameras, and portable telephones has rapidly increased, and electric vehicles, storage batteries for energy storage, robots, and satellites have been developed in earnest. Are being studied actively.

The secondary rechargeable batteries are nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel- It is very popular because of its low self-discharge rate and high energy density.

These lithium secondary batteries mainly use a lithium-based oxide and a carbonaceous material as a cathode active material and an anode active material, respectively. The lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate each coated with such a positive electrode active material and a negative electrode active material are disposed with a separator interposed therebetween, and an outer casing, that is, a battery case, for sealingly storing the electrode assembly together with the electrolyte solution.

Generally, a lithium secondary battery can be classified into a can type secondary battery in which an electrode assembly is embedded in a metal can, and a pouch type secondary battery in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, depending on the shape of the casing.

In recent years, secondary batteries are widely used not only in small-sized devices such as portable electronic devices, but also in medium to large-sized devices such as automobiles and electric power storage devices. In particular, demand for hybrid cars and electric vehicles is increasing worldwide, including the US, Europe, Japan, and Korea, as carbon energy is gradually depleted and environmental concerns are rising. The most important components in such hybrid vehicles and electric vehicles are battery packs that give drive power to vehicle motors. Since hybrid cars and electric vehicles can obtain the driving force of the vehicle through charging and discharging of the battery pack, the number of users is increasing because the fuel economy is excellent and the pollutant is not discharged or reduced as compared with a vehicle using only an engine. The battery pack of the hybrid vehicle or the electric vehicle includes a plurality of secondary batteries, and the plurality of secondary batteries are connected in series and in parallel to improve capacity and output.

On the other hand, the battery pack includes various battery pack protecting devices such as a BMS (Battery Management System) in addition to the secondary battery. These protective devices can perform various roles such as managing the charge and discharge of the battery pack and ensuring safety, and a representative factor to be considered in performing the role is the voltage of each secondary battery. For example, the specific protection device can prevent the secondary battery from overcharging or over discharging through the voltage between both ends of each secondary battery, and can perform a balancing function to reduce the charging state deviation between the secondary batteries.

Since it is very important and important to sense the voltage of each secondary battery included in the battery pack in performing a specific function of the protection device included in the battery pack, A voltage sensing structure for detecting the voltage of the battery is mostly applied. Typical voltage sensing structures include wire and welding.

The wire system connects the electrode portion of the secondary battery and the printed circuit board (PCB) of the voltage sensing module with a sensing wire and a clip. Such a wire method is excellent in assembling property, but the cost of the product is increased by adding a wire part. In addition, the voltage sensing module, which is fastened to the upper and lower ends of the secondary battery stack, is connected by wires, so that the secondary battery stack is extended in the longitudinal direction, thereby increasing the unit price.

In the welding method, the electrode portion of the secondary battery and the PCB of the voltage sensing module are connected by the welding of the bus bar. Such a welding method reduces the cost of the product by eliminating the wire parts but adds the welding cost and the number of the welding operations. And, the welded part has a risk of being disconnected by vibration or impact. As a result, when the battery module is assembled or an external force (impact condition, etc.) is applied, the welded portion may be damaged. In the case of applying to a battery pack such as an automobile, There is also a problem that it is difficult to separate or replace the battery pack when the battery pack is defective.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a secondary battery and a voltage sensing module, wherein the secondary battery and the voltage sensing module are electrically connected to each other, And to provide a battery module and a manufacturing method thereof that can simplify the assembling process.

According to an aspect of the present invention, there is provided a battery module including: a plurality of secondary batteries having electrode leads; And a voltage sensing module including a PCB electrically connected to the electrode lead to sense a voltage of the secondary battery, and a conductive rubber is used to electrically connect the electrode lead and the PCB.

The conductive rubber is preferably compressed.

In a preferred embodiment, a voltage sensing terminal made of the conductive rubber is surface mounted on the PCB, and the voltage sensing terminal contacts the electrode lead to sense a voltage. The conductive rubber may be fixedly mounted on the PCB via an adhesive. As another example, the conductive rubber may be formed by directly coating the conductive rubber composition on the PCB.

The voltage sensing module may include a sensing front cover between the electrode lead and the PCB, and a sensing rear cover outside the PCB. The sensing front cover and the sensing rear cover press the voltage sensing terminals by pressing the electrode leads and the voltage sensing terminals to maintain contact between the electrode leads and the voltage sensing terminals.

Preferably, the compression amount of the voltage sensing terminal is determined in advance by determining the hardness and compressibility of the conductive rubber constituting the voltage sensing terminal, and the maximum clearance distance between the PCB and the electrode lead when the shock or vibration is applied. This can be calculated by synthesizing the results of the preliminary experiments repeated under a predetermined condition on the secondary battery of the specific model.

The voltage sensing module may further include a connector terminal connected to the PCB and connected to an external device for sensing a voltage of the secondary battery.

The battery module according to the present invention may further include an external terminal electrically connected to the electrode lead. And a terminal bus bar connecting the electrode lead and the external terminal.

One or more battery modules according to the present invention may be combined into a battery pack. Such a battery pack can be applied to an automobile or the like.

The present invention also provides a battery module manufacturing method as described above. The method includes: preparing a plurality of secondary batteries having electrode leads; Preparing a voltage sensing module including a PCB to sense voltage of the secondary battery; And electrically connecting the electrode lead to the PCB using a conductive rubber.

According to the present invention, the conductive rubber is elastically deformed so as to be in close contact with the electrode lead of the secondary battery. Even if vibration or impact is applied to the secondary battery, the conductive rubber deforms and absorbs the energy, and the electrical connection relation is maintained well. As a result, the electrical connection portion between the secondary battery and the voltage sensing module becomes strong against vibration or impact.

According to the present invention, not only the number of welding (welding) is reduced as compared with the conventional sensing technologies, but also the manufacturing cost is reduced, which greatly improves the productivity of production. In addition, the conductive rubber is less expensive than other elastic structures (for example, a spring), thereby reducing manufacturing costs.

The battery module according to the present invention not only reduces manufacturing costs by reducing the number of air and parts such as welding, but also structurally improves the problems of vibration and impact. Therefore, the battery module can be applied to electric vehicles, hybrid vehicles, A plug-in hybrid electric vehicle and the like.

In particular, according to one aspect of the present invention, the electrode leads of the secondary battery and the PCB are electrically connected simply by surface-mounting the conductive rubber on the PCB and simply laminating and laminating the same on the secondary battery laminate. The structure of the voltage sensing module for sensing the voltage of the secondary battery, the structure of the module and the pack are simplified compared to the conventional structure, the assembling process of connecting the voltage sensing module to the secondary battery can be performed more easily, Can be saved.

In addition, in the case of the battery module according to the present invention, since the electrical connection between the electrode lead of the secondary battery and the PCB is made of the conductive rubber, the electrical connection between the electrode lead of the secondary battery and the PCB is simplified by eliminating the elastic deformation of the conductive rubber. Can be released. Therefore, it is possible to easily release the electrical connection between the electrode lead of the secondary battery and the PCB in a situation such as a failure of the battery pack. In this way, when the battery pack is defective, the separation and replacement are as easy as the assembling process, and the problem can be solved quickly.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention, And should not be construed as limiting.
1 is an exploded perspective view illustrating a battery module according to an embodiment of the present invention.
2 is a completed perspective view of the battery module shown in FIG.
3 is a cross-sectional view taken along line III-III 'of FIG.
4 is a top view and a bottom view of the PCB of the sensing module located on the left side of the battery module shown in FIG.
5 is a top view and a bottom view of the PCB of the sensing module located on the right side of the battery module shown in FIG.
Figs. 6 and 7 are schematic sectional views of portions corresponding to portions a and b in Fig. 3, Fig. 6 shows a state before the sensing rear cover is fastened, and Fig. 7 shows a state after fastening the sensing rear cover.

The present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the embodiments described herein are illustrated by way of example for purposes of clarity of understanding and that the present invention may be embodied with various modifications and alterations. Also, for ease of understanding of the invention, the appended drawings are not drawn to scale, but the dimensions of some of the components may be exaggerated.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 1 is an exploded perspective view illustrating a battery module according to an embodiment of the present invention, and FIG. 2 is a completed perspective view of the battery module shown in FIG. 1. Referring to FIG. 3 is a cross-sectional view taken along line III-III 'of FIG.

1 to 3, a battery module 100 according to an embodiment of the present invention includes a plurality of secondary batteries 11, a plurality of cartridges 12 accommodating the secondary batteries 11, And a pair of voltage sensing modules 20 for sensing the voltage.

As the secondary battery 11, a pouch type secondary battery including an electrode assembly and a pouch case for accommodating the electrode assembly may be used. The secondary cells 11 of the present embodiment are bidirectional cells in which electrode leads 11a of different polarities extend in opposite directions to each other.

The cartridge 12 accommodates at least one secondary battery 11 having a pair of electrode leads 11a. The cartridge 12 accommodates the secondary battery 11 so that the electrode lead 11a is drawn out to the outside. The cartridge 12 is configured to hold the secondary battery 11 to prevent the secondary battery 11 from flowing and to stack the secondary batteries 11, thereby guiding the assembly of the secondary battery 11. Such cartridges 12 may be replaced by various other terms such as a lamination frame, a molded case, and the like, and may be configured in the form of a square ring having a generally central portion as an empty portion. In this case, four corners of the cartridge 12 may be located on the outer peripheral portion of the secondary battery 11. [

The cartridge 12 is provided with a through-hole 12a so that the long bolt-like fixing member 13 can be inserted and engaged. The through-hole 12a allows the sensing front cover 15, the voltage sensing module 20, and the sensing rear cover 30 to be coupled to the cartridge 12. These through-holes 12a may be provided on both sides of the cartridge 12 in the direction in which the electrode leads 11a are drawn out, that is, in the longitudinal direction of the cartridge 12. [

When a plurality of secondary batteries 11 are accommodated in the cartridge 12, the secondary batteries 11 are connected in series, parallel or series with each other through the coupling of the electrode leads 11a provided in each secondary battery 11. [ Parallel can be connected in a mixed way. The cartridges 12 adjacent to each other among the plurality of cartridges 12 are also connected in series, parallel, or in series and in parallel through electrode leads 11a provided in the secondary battery 11, ) Can be increased, or the output voltage can be increased. In the present embodiment, a description will be made by taking as an example a battery module 100 in which one cartridge 12 accommodates two secondary batteries 11 and two such cartridges 12 are included.

As shown in the figure, when the secondary batteries 11 are stacked side by side, the negative electrode lead and the positive electrode lead are alternately arranged. Here, each of the electrode leads 11a is formed in a plate shape and protrudes to the outside of the pouch case. And then bent for electrical connection between the electrode leads 11a to have a bent portion.

As shown in Fig. 3, the electrode lead 11a protrudes from the secondary battery 11, and the end portion is bent to the left or right to provide a flat vertical contact surface. The electrode leads 11a may be bent in different directions so that the electrode lead bends of the different polarities of the adjacent secondary batteries 11 may overlap each other. For example, in the embodiment of FIG. 1, the electrode leads 11a located on the left side of the battery module 100 may be connected to each other by two, such that two bent portions overlap each other, 100, the outermost electrode leads 11a may not be bent so that only one of the electrode leads 11a located on the right side of the electrode leads 11a is overlapped with each other. This example relates to a series connected structure. However, it is needless to say that the present invention is not limited to these exemplary connection structures.

The voltage sensing module 20 is connected to the electrode leads 11a so as to individually measure the voltage of each secondary battery 11. The voltage sensing module 20 includes a voltage sensing terminal 21, 4 and a terminal bus bar 24 and also includes a sensing front cover 15 and a sensing rear cover 30 coupled to the cartridge 12 as in this embodiment can do.

4 is a top view and a bottom view of the PCB of the sensing module located on the left side of the battery module shown in FIG. 5 is a top view and a bottom view of the PCB of the sensing module located on the right side of the battery module shown in FIG.

4, the voltage sensing module 20 located on the left side in the present embodiment includes a connector terminal 23 on the upper surface of the PCB 22 (toward the sensing rear cover 30) The voltage sensing terminal 21 is surface-mounted on the bottom (or on the lower surface facing the sensing front cover 15).

5, the voltage sensing module 20 located on the right side in the present embodiment is connected to the terminal bus bar 24 on the upper surface of the PCB 22 (toward the sensing rear cover 30) The voltage sensing terminal 21 is surface-mounted on the bottom surface (or the bottom surface of the PCB 22 facing the sensing front cover 15). A hole may be formed in the PCB 22 so that the terminal bus bar 24 is coupled to the PCB 22. By inserting the end of the terminal bus bar 24 into the hole of the PCB 22, The connection of the terminal bus bar 24 can be made

The voltage sensing terminal 21 senses a voltage in contact with the electrode lead 11a when the cartridge 12 and the voltage sensing module 20 are coupled to each other and the voltage sensing module 20 is coupled to the cartridge 12 The electrode lead 11a can be brought into contact with the electrode lead 11a in such a manner as to elastically pressurize the electrode lead 11a. The voltage sensing terminal 21 should be formed at a position corresponding to the electrode lead 11a in the PCB 22. [

The voltage sensing terminal 21 is made of a conductive rubber. The conductive rubber may be fixedly mounted on the PCB 22 via an adhesive. As another example, the conductive rubber may be formed by directly coating the conductive rubber composition on the PCB. As another example, it may be mounted by soldering or the like.

Conductive rubbers contain conductive materials in synthetic rubber and have excellent electrical conductivity and elasticity. Synthetic rubbers include but are not limited to styrene butadiene rubber, polychloroprene rubber, acrylonitrile-butadiene rubber, isoprene-isobutylene rubber, butadiene rubber, isoprene rubber ), Ethylene Propylene Rubber, Polysulfide Rubber, etc. may be used. Synthetic rubbers other than those exemplified above may also be used. The conductive material may be a metal powder, a carbon powder, a carbon nanotube, or the like. For example, gold, silver, copper, nickel, iron and silver coated copper powder, silver coated nickel powder and silver coated iron powder and the like can be used.

The PCB 22 has an internal circuit configured to allow a plurality of electrode leads 11a to be independently connected to the connector terminal 23, and is, for example, a printed circuit board on which a pattern of such an internal circuit is printed.

The connector terminal 23 corresponds to a measuring device for measuring the voltage of each secondary battery 11, that is, a terminal to which an external device is connected, and outputs the sensed voltage to the outside. Thus, the PCB can deliver the voltage sensed by the voltage sensing terminal 21 to the other external components via the printed circuit and connector terminal 23, such as a protection device such as a BMS.

1, the sensing front cover 15 includes a protrusion 15a that can be fitted between the cartridges 12, an opening 15b into which the electrode lead 11a can be fitted, And a rib 15c for supporting the ribs 11a. This sensing front cover 15 is used as a mold for supporting the electrode lead 11a.

A protruding portion 15a is inserted between the through holes 12a of the cartridge 12 and the electrode lead 11a is inserted into the opening 15b so as not to interfere with the communication between the through- The sensing front cover 15 is fastened to both ends of the structure in which the secondary batteries 11 are stacked by the cartridge 12 in a manner that the secondary batteries 11 are supported by the ribs 15c.

The voltage sensing terminals 21 of the voltage sensing module 20 may be brought into contact with the electrode leads 11a of the secondary batteries 11, The PCB 22 is laminated on the front cover 15 (step 2).

The sensing rear cover 30 is fastened to the cartridge 12 and the sensing rear cover 30 located on the left side in the battery module 100 shown in FIG. 1 is inserted into the through hole 12a of the cartridge 12, And a rib 30b for fixing the position of the PCB 22. The sensing rear cover 30 located on the right side of the battery module shown in Fig. 1 is provided with a through hole 30a communicating with the cartridge 12 And an external terminal 33 for connecting the terminal bus bar 24 with the protruding portion 30c. Although not shown in the drawing, the sensing rear cover 30 located on the right side of the battery module shown in FIG. 1 may be provided with a rib 30b for fixing the PCB 22.

After the PCB 22 is laid, a through-hole 30a and a protrusion 30c are sandwiched between the through-holes 12a of the cartridge 12 while the sensing rear cover 30 is laminated, and a long bolt- Is inserted into the through hole (12a) and fastened. Thus, the electrical connection between the voltage sensing module 20 and the secondary battery 11 is completed (step 3).

The supporting rib 30b may be positioned opposite to the voltage sensing terminal 21 with the electrode lead 11a interposed therebetween to support the electrode lead 11a. That is, the support ribs 30b can elastically press the voltage sensing terminals 21 and the electrode leads 11a while supporting the contact between the voltage sensing terminals 21 and the electrode leads 11a It is. Thus, the sensing rear cover 30 functions as a conductive rubber contact holding mold.

The external terminal 33 functions as an electrical connection path between the secondary battery 11 and an external device that operates upon receiving power from the secondary battery 11 and is electrically connected to the electrode lead of the secondary battery 11 11a and protrudes outward from the battery module 100. As shown in Fig.

The terminal bus bar 24 connects between the electrode lead 11a of the secondary battery 11 and the external terminal 40.

The battery module 100 includes the external terminal 33 and the terminal bus bar 24 so that the external device can be electrically connected to the plurality of secondary batteries 11. [

The sensing front cover 15 and the sensing rear cover 30 can prevent the connection relationship from being released due to vibration in the contact state between the electrode lead 11a, the voltage sensing terminal 21 and the PCB 22. For example, an insulator such as a synthetic resin.

As described above, the electrical connection structure between the electrode leads 11a, the voltage sensing terminals 21, and the PCB 22 is completed by the simple three-step lamination and fastening, and there is no need for any unnecessary structure or troublesome processes . Therefore, the assembling process of electrically connecting the secondary battery and the voltage sensing module can be simplified.

That is, according to the present invention, not only the number of welding (welding) compared to the conventional sensing technologies is reduced, but also the manufacturing cost is reduced, which greatly improves the productivity of the manufacturing. In addition, the conductive rubber is less expensive than other elastic structures (for example, a spring), thereby reducing manufacturing costs.

The voltage sensing terminal 21 made of the conductive rubber is elastically deformed while being electrically connected to the electrode lead 11a of the secondary battery 11 so that the voltage sensing terminal 21 can closely contact the electrode lead 11a. Accordingly, even if vibration is applied to the secondary battery 11, the conductive rubber is deformed to absorb the impact, and the electrical connection relation is maintained well. Therefore, in the secondary battery module 100 according to the present invention, the electrical connection portion between the secondary battery 11 and the voltage sensing module 20 becomes strong against vibration or shock.

As described above, the battery module 100 according to the present invention uses a conductive rubber to electrically connect the electrode lead 11a and the PCB 22. Conductive rubber is an electrically conductive elastomer. Such an elastic body may be compressed and absorbs external pressure or vibration when applied, so that vibration durability of the secondary battery 11 and the battery module 100 including the secondary battery 11 can be improved. In addition, the battery module 100 according to the present invention includes a surface-mounted voltage sensing terminal 21 made of conductive rubber on the PCB 22, a voltage sensing terminal 21 contacting the electrode lead 11a, . It is not limited to merely applying an electrically conductive elastomer because it involves improvement of the fastening structure and process.

Next, the contact structure between the electrode lead 11a and the voltage sensing terminal 21 will be described in more detail with reference to FIGS. 6 and 7. FIG.

Figs. 6 and 7 are schematic cross-sectional views of portions corresponding to portions a and b in Fig. 3, and are exaggerated and simplified for convenience of illustration and explanation.

First, Fig. 6 shows a state in which only steps 1 and 2 of the manufacturing method are performed, that is, a state before the sensing rear cover 30 is fastened.

Next, Fig. 7 shows the state of step 3 of the manufacturing method, that is, the state after the sensing rear cover 30 is fastened.

The voltage sensing terminal 21 is coupled with the sensing front cover 15 and the sensing rear cover 30 to compress the voltage sensing terminal 21 by pressing the electrode lead 11a and the voltage sensing terminal 21, The voltage sensing terminal 21 of FIG. The contact between the electrode lead 11a and the voltage sensing terminal 21 can be maintained.

That is, the voltage sensing terminal 21 and the electrode lead 11a are closely contacted by elastic pressure, and the contact state is maintained tightly. Even if vibration is applied to the secondary battery 11, the conductive rubber constituting the voltage sensing terminal 21 is deformed to absorb the impact, so that the electrical connection relation is maintained well. As a result, the electrical connection portion between the secondary battery 11 and the voltage sensing module 20 becomes strong against vibration or impact. The contact due to the elastic pressing is performed when the voltage sensing module 20 is fastened to the cartridge 12 as described above.

6 and 7, in the present invention, it is possible to prevent the contact failure of the voltage sensing terminal 21 made of conductive rubber through the sensing rear cover 30 after the PCB 22 is assembled. After assembly of the PCB 22 in which the voltage sensing terminals 21 are formed, a suitable amount of compression of the conductive rubber is required. This is for maintaining the contact between the electrode lead 11a and the voltage sensing terminal 21 even if a vibration shock is applied. For example, to prevent a drop in an occurrence of an issue such as an impact vibration during driving the vehicle. The amount of compression of the conductive rubber is given by d-d 'in these figures. The maximum clearance distance between the PCB 22 and the electrode lead 11a in the event of an issue such as impact (hardness, compression ratio) of the conductive rubber constituting the voltage sensing terminal 21 and shock or vibration during running of the vehicle is determined in advance, .

Impact or vibration through pre-repeated tests (including simulations), taking into account the hardness and compressibility of the conductive rubber to be used, and the unevenness of the roads that can occur during normal speeding, collision possibilities, The maximum clearance distance between the PCB 22 and the electrode lead 11a can be determined in advance. The compression amount is preferably equal to or greater than the maximum clearance distance. This compression amount will not exceed 1 mm in consideration of hardness and compression ratio of a general rubber, predetermined conditions, and tolerances.

As described above, the battery module 100 according to the embodiment of the present invention includes the voltage sensing terminal 20 and the electrode lead 11a through the coupling of the voltage sensing module 20 to the cartridge 12, So that the contact and the electrical connection are simultaneously performed. In addition, it has a structure in which the coupling between the voltage sensing terminal 21 and the electrode lead 11a can be stably maintained even when an external impact is applied.

Accordingly, by adopting the structure of the battery module 100 according to an embodiment of the present invention, it is possible not only to improve the efficiency of the battery module manufacturing process, but also to improve the quality of the product.

In addition, in the case of the battery module according to the present invention, since the electrical connection between the electrode lead of the secondary battery and the PCB is made of the conductive rubber, the electrical connection between the electrode lead of the secondary battery and the PCB is simplified by eliminating the elastic deformation of the conductive rubber. Can be released. Therefore, it is possible to easily release the electrical connection between the electrode lead of the secondary battery and the PCB in a situation such as a failure of the battery pack. In this way, when the battery pack is defective, the separation and replacement are as easy as the assembling process, and the problem can be solved quickly.

Meanwhile, the battery pack according to the present invention includes at least one of the above-described battery modules. At this time, in addition to the battery module, the battery pack may further include a case for accommodating the battery module and various devices for controlling charge / discharge of the battery module, such as a BMS, a current sensor, a fuse, and the like.

The battery module or the battery pack according to the present invention can be applied to an automobile such as an electric car or a hybrid car. The structure according to the present invention not only reduces the manufacturing cost by reducing the number of air and parts such as welding, but also structurally improves the problems of vibration and impact. Therefore, the structure according to the present invention can be applied to electric vehicles, hybrid vehicles, - hybrid electric vehicle and the like.

As described above, the problems and advantages to be solved by the present invention can be understood by the above detailed description, and can be more clearly understood by the embodiments of the present invention. It is also to be understood that the objects and advantages of the present invention may be realized and attained by means of the instrumentalities and combinations thereof. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It goes without saying that various modifications and variations are possible within the scope of equivalence of the scope.

In the present specification, terms indicating upward, downward, leftward, and rightward directions are used, but these terms are for convenience of explanation only, and may vary depending on the position of the object or the position of the observer. Lt; / RTI >

11: Secondary cell 11a: Electrode lead
12: cartridge 12a, 30a:
13: Fixing member 15: Front sensing cover
15a, 30c: protrusion 20: voltage sensing module
21: voltage sensing terminal 22: PCB
23: Connector terminal 24: Terminal bus bar
30: Rear sensing cover 30b: Rib
33: External terminal 100: Battery module

Claims (16)

A plurality of secondary batteries having electrode leads; And
And a voltage sensing module including a PCB electrically connected to the electrode lead to sense voltage of the secondary battery,
And a conductive rubber is used to electrically connect the electrode lead and the PCB. The battery module of claim 1, wherein the conductive rubber is compressed. The battery module according to claim 1, wherein a surface-mounted voltage sensing terminal made of conductive rubber is mounted on the PCB, and the voltage sensing terminal contacts the electrode lead to sense a voltage. 4. The battery module of claim 3, wherein the conductive rubber is fixedly mounted on the PCB via an adhesive. 4. The battery module of claim 3, wherein the conductive rubber is formed by directly coating a conductive rubber composition on the PCB. The battery module of claim 3, wherein the voltage sensing module further comprises a sensing front cover between the electrode lead and the PCB, and a sensing rear cover outside the PCB. 7. The battery pack according to claim 6, wherein the sensing front cover and the sensing rear cover press the voltage sensing terminals by pressing the electrode leads and the voltage sensing terminals to maintain contact between the electrode leads and the voltage sensing terminals. module. The battery module according to claim 1, wherein the voltage sensing module further comprises a connector terminal connected to the PCB and connected to an external device for sensing a voltage of the secondary battery. The battery module according to claim 1, further comprising an external terminal electrically connected to the electrode lead. The battery module according to claim 9, further comprising a terminal bus bar connecting the electrode lead and the external terminal. The electronic device according to claim 7, wherein the compression amount of the voltage sensing terminal is determined by previously determining the hardness and compression ratio of the conductive rubber constituting the voltage sensing terminal and the maximum clearance distance between the PCB and the electrode lead at the time of impact or vibration, Battery module. Preparing a plurality of secondary batteries having an electrode lead;
Preparing a voltage sensing module including a PCB to sense voltage of the secondary battery; And
And electrically connecting the electrode lead to the PCB using a conductive rubber. 13. The method of claim 12, wherein the PCB is surface mounted with a voltage sensing terminal made of conductive rubber, and the voltage sensing terminal is brought into contact with the electrode lead. The sensor module according to claim 13, wherein the voltage sensing module further comprises a sensing front cover and a sensing rear cover, wherein a sensing front cover is provided between the electrode lead and the PCB, and a sensing rear cover is installed outside the PCB To the battery module. 15. The apparatus of claim 14, wherein the sensing front cover and the sensing rear cover compress the voltage sensing terminal by pressing the electrode lead and the voltage sensing terminal to tightly contact the electrode lead and the voltage sensing terminal. Of the battery module. [16] The method of claim 15, wherein the compression amount of the voltage sensing terminal is determined in advance by determining the hardness and compression ratio of the conductive rubber constituting the voltage sensing terminal and the maximum clearance distance between the PCB and the electrode lead when a shock or vibration is applied Of the battery module.

Images