CN212874698U

CN212874698U - Flexible circuit board, electric core module and battery pack

Info

Publication number: CN212874698U
Application number: CN202021712801.8U
Authority: CN
Inventors: 陈健宝; 张国江; 陆君高
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-04-02
Anticipated expiration: 2030-08-17

Abstract

The utility model belongs to the technical field of the battery package. Specifically disclosed are a flexible circuit board, a battery cell module and a battery pack. The flexible circuit board is provided with a joint and a cutting part, and the joint is positioned between the two cutting parts. The joint is used for connecting the electrode lead-out piece of electric core module, installs temperature sensor in the portion of tailorring, and the temperature sensor butt has the terminal surface of relief valve on electric core module. The temperature sensor is arranged on the cutting part of the flexible circuit board, other mounting structures are not required to be added, and the cost of the flexible circuit board is saved. The temperature sensor butt has the terminal surface of relief valve in electric core module, can accurately measure the temperature of electric core. The battery cell module comprises the flexible circuit board. The battery pack comprises the flexible circuit board. The accuracy of the temperature measurement of electric core module and battery package has been improved.

Description

Flexible circuit board, electric core module and battery pack

Technical Field

The utility model relates to a battery package technical field especially relates to a flexible circuit board, electric core module and battery package.

Background

The temperature sensor of current square aluminum hull power electricity core module is located the side of aluminium row or electric core mostly, has following defect:

1) when a large current passes through the aluminum bar, the temperature of the aluminum bar is higher than the actual temperature of the battery cell. At this time, the temperature collected by the temperature sensor cannot effectively reflect the real temperature inside the battery core, so that the battery management system makes an erroneous judgment on the temperature of the battery core.

2) When electric core is about to take place thermal runaway, the temperature sensor that is located electric core side can't detect electric core thermal runaway's temperature fast effectively, is unfavorable for battery management system in time to implement safeguard procedures to electric core, is unfavorable for the safety of electric core module, moves steadily.

Therefore, a flexible circuit board, a battery cell module and a battery pack are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flexible circuit board to the problem of the temperature when the actual temperature of the unable accurate measurement electric core module of temperature sensor in the solution electric core module and thermal runaway.

To achieve the purpose, the technical proposal adopted by the utility model is that:

a flexible circuit board is used for collecting the temperature of a battery cell module and is provided with a connector and cutting parts, wherein the connector is positioned between the two cutting parts; the connector is used for connecting the electrode leading-out piece of the battery cell module, a temperature sensor is installed on the cutting part, and the temperature sensor abuts against the end face of the battery cell module with the pressure release valve.

Preferably, the temperature sensor abuts against an area near the pressure release valve on the end surface of the cell module.

Preferably, one end of the cutting part is connected with the flexible circuit board body, and the other end of the cutting part is bent to form a bending section; the temperature sensor is arranged on one side of the bending section.

Preferably, the bending angle of the bending section is 180 °.

Preferably, the other side of the bending section departing from the temperature sensor is fixedly connected with the flexible circuit board.

Preferably, the flexible circuit board is provided with an insulating sleeve formed by surrounding a plurality of insulating plates, a sealing glue layer is filled in an inner cavity of the insulating sleeve, and the temperature sensor is packaged in the sealing glue layer.

Preferably, the top of the sealing adhesive layer is coated with heat-conducting adhesive, and the temperature sensor abuts against the end face of the cell module with the pressure release valve through the heat-conducting adhesive.

Preferably, the joint is connected with a nickel sheet in a welding manner and is connected with the electrode lead-out sheet through the nickel sheet.

Another object of the utility model is to provide an electricity core module to solve the problem of the temperature when the actual temperature of the unable accurate measurement electric core module of temperature sensor in the electricity core module and thermal runaway.

a battery cell module comprises the flexible circuit board.

Another object of the utility model is to provide a battery pack to solve the problem of the temperature when the actual temperature of the unable accurate measurement electric core module of temperature sensor in the electric core module and thermal runaway.

a battery pack comprises the battery cell module.

The utility model has the advantages that: this flexible circuit board passes through the joint and links to each other with electric core module, and temperature sensor installs in flexible circuit board's the portion of tailorring, and the butt has the terminal surface of relief valve in electric core module for temperature sensor can the accurate temperature of measuring electric core, has improved temperature sensor's measurement accuracy. Moreover, the temperature sensor is arranged on the cutting part, other installation structures are not required to be added, and the cost of the flexible circuit board is saved.

Drawings

Fig. 1 is a schematic structural diagram of a battery cell module according to a first embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is an end view of a front surface of a flexible circuit board according to an embodiment of the present invention;

fig. 4 is an end view of the back side of a flexible circuit board according to an embodiment of the present invention;

FIG. 5 is a partial enlarged view at B in FIG. 4;

fig. 6 is an end view of the front surface of the flexible circuit board according to the second embodiment of the present invention;

fig. 7 is an end view of the back side of the flexible circuit board according to the second embodiment of the present invention;

fig. 8 is an end view of the front surface of the flexible circuit board according to the third embodiment of the present invention;

fig. 9 is an end view of the back side of the flexible circuit board according to the third embodiment of the present invention.

The component names and designations in the drawings are as follows:

10. a flexible circuit board; 20. a battery cell module; 201. an electrode lead-out sheet; 202. a nickel sheet; 203. a pressure relief valve;

1. a joint; 2. a cutting part; 21. bending sections; 3. a temperature sensor; 4. an insulating sleeve; 5. heat conducting glue; 6. a plug-in part.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Example one

As shown in fig. 1 to 4, the present embodiment discloses a flexible circuit board 10 for collecting the temperature of a cell module 20. The flexible circuit board 10 has a tab 1 and a cut-out portion 2, and the tab 1 is located between the two cut-out portions 2. Joint 1 is used for connecting the electrode of electric core module 20 and draws forth piece 201, installs temperature sensor 3 on cutting out portion 2, and the terminal surface that has relief valve 203 is pressed to temperature sensor 3 butt on electric core module 20.

In this embodiment, the flexible circuit board 10 is connected to the cell module 20 through the joint 1, and the temperature sensor 3 is installed on the cutting portion 2 of the flexible circuit board 10 and abuts against the end surface of the cell module 20 having the pressure release valve 203. Install on the side of electric core or the aluminium row for original temperature sensor, temperature sensor 3 in this embodiment can the accurate temperature of measuring electric core, has improved temperature sensor 3's measurement accuracy. Incidentally, the conventional flexible circuit board forms a joint by cutting and removing the cut portion. In the present embodiment, the cut portion 2 is not removed, but the cut portion 2 is divided to form the joint 1, and the temperature sensor 3 is mounted on the cut portion 2, so that there is no need to add another mounting structure, and the cost of the flexible circuit board 10 is saved.

Specifically, the tab 1 is welded with a nickel plate 202 and connected to an electrode tab 201 through the nickel plate 202. The flexible circuit board 10, the nickel sheet 202 and the electrode lead-out sheet 201 are sequentially connected in a welding manner, so that the flexible circuit board 10 can collect the voltage of the battery cell module 20. Therefore, the flexible circuit board 10 can have both the temperature acquisition function and the voltage acquisition function. One end of the flexible circuit board 10 along the length thereof is provided with a plug-in part 6, the flexible circuit board 10 is electrically connected with a battery management system (not shown in the figure) through the plug-in part 6, and the acquired temperature information and voltage information are fed back to the battery management system in time, so that the battery management system can make an accurate judgment.

Preferably, the temperature sensor 3 abuts on an area near the relief valve 203 on the end surface of the cell module 20. The measured temperature can reflect the temperature inside the battery cell more truly and accurately. Moreover, when the battery core is out of control due to heat, the temperature of the pressure release valve 203 rises sharply, and the temperature sensor 3 can detect the temperature of the area near the pressure release valve 203 and feed the temperature back to the battery management system, so that the battery management system can make a judgment quickly and accurately, and the safety of the battery core module 20 is improved. Since the battery management system is a mature technical means in the field, the detailed working principle thereof is not described herein again.

As shown in fig. 3-5, one end of the cutting portion 2 is connected to the body of the flexible circuit board 10, and the other end is bent to form a bending section 21. The temperature sensor 3 is installed at one side of the bending section 21.

The front surface of the flexible circuit board 10 has a circuit. In order to avoid increasing the cost and the design difficulty of the flexible circuit board 10, the temperature sensor 3 is installed on the front surface of the bending section 21 of the cutting part 2, and then the bending section 21 is bent, so that the temperature sensor 3 can abut against the end surface of the cell module 20 with the pressure release valve 203.

Specifically, the cutting part 2 is located at one side of the flexible circuit board 10, facilitating cutting. The cut portion 2 is bent at a straight section assumed by itself, and a bent section 21 is formed. The extending direction of the bending section 21 is the other end opposite to the joint 1, which is pointed by the end of the flexible circuit board 10 having the joint 1, so that the temperature sensor 3 can be abutted to the pressure release valve 203, and the real temperature of the battery cell can be measured quickly and accurately.

Preferably, the bending angle of the bending segment 21 is 180 °. The bending section 21 is bent from the front surface to the back surface of the flexible circuit board 10, and is parallel to the back surface of the flexible circuit board 10, so as to increase the contact area between the temperature sensor 3 and the end surface of the cell module 20 with the pressure release valve 203. In the present embodiment, the imaginary straight line segment is 45 ° to the extending direction of the cut portion 2, and the bending segment 21 is perpendicular to the portion of the cut portion 2 where no bending occurs.

Preferably, the other side of the bending section 21 facing away from the temperature sensor 3 is fixedly connected to the flexible circuit board 10. The bent section 21 and the back surface of the flexible circuit board 10 are adhered together by using a double-sided adhesive tape to fix the relative position therebetween.

As shown in fig. 5, the flexible circuit board 10 is provided with an insulating sleeve 4 formed by surrounding a plurality of insulating plates, an inner cavity of the insulating sleeve 4 is filled with a sealant layer, and the temperature sensor 3 is encapsulated in the sealant layer. In this embodiment, the insulating plate is an epoxy plate. The round insulating sleeve 4 surrounded by four epoxy plates can well protect the temperature sensor 3 from being collided by external objects. Meanwhile, the temperature sensor 3 is packaged in the sealing adhesive layer, so that water vapor is isolated, and the temperature of the battery cell can be accurately measured by the temperature sensor 3 in a humid environment. Of course, the insulating sleeve 4 may also be square. The specific structure and size of the insulating sleeve 4 are only required to satisfy the installation of the temperature sensor 3, and are not particularly limited herein.

Preferably, the top of the sealant layer is coated with a heat-conducting adhesive 5, and the temperature sensor 3 abuts against the end surface of the cell module 20 with the pressure release valve 203 through the heat-conducting adhesive 5. Temperature sensor 3 links to each other with the terminal surface of electric core module 20 through sealing glue layer and heat-conducting glue 5, has improved temperature sensor 3's measurement accuracy and accuracy. It is understood that the heat conductive glue 5 and the sealant forming the sealant layer may be the same glue or different kinds of glues. The sealant and the heat conducting glue 5 are mature products in the field, and are not described in detail herein.

As shown in fig. 1, the present embodiment further discloses a battery cell module 20, which includes the flexible circuit board 10. This electric core module 20 includes a plurality of electric cores that set up side by side, and two arbitrary adjacent electric cores are opposite at the polarity of two utmost point posts of electric core module 20 with the one end, and relief valve 203 sets up with utmost point post is adjacent.

The embodiment also discloses a battery pack, which comprises the battery cell module 20. The temperature sensor 3 in this electric core module 20 and the battery package all can accurately measure the temperature of electric core. Moreover, the temperature sensor 3 is installed on the cutting part 2 of the flexible circuit board 10, and other installation structures are not needed, so that the cost is saved.

Example two

As shown in fig. 6 and 7, the present embodiment discloses a flexible circuit board 10 for collecting the temperature of a cell module 20, the flexible circuit board 10 is substantially the same as the flexible circuit board 10 in the first embodiment, and a bending section 21 is bent from the front side to the back side of the flexible circuit board 10 and is arranged in parallel with the back side of the flexible circuit board. The main differences are that: the extending directions of the bending segments 21 are opposite.

In the present embodiment, the flexible circuit board 10 has a first end and a second end in its width direction, wherein the first end has the tab 1 and the cut-out portion 2 thereon. The bending section 21 bends, and the extending direction is the direction from the second end to the first end. Temperature sensor 3 of installation on the section of bending 21 can the butt have the terminal surface of relief valve 203 on electric core module 20, improves temperature sensor 3's the temperature measurement degree of accuracy.

EXAMPLE III

As shown in fig. 8 and fig. 9, the present embodiment discloses a flexible circuit board 10 for collecting the temperature of a cell module 20, where the flexible circuit board 10 is substantially the same as the flexible circuit board 10 in the first embodiment, and the main differences are that: the bending form and the extending direction of the bending section 21 are different.

The virtual straight line segment bent at the cutting part 2 is perpendicular to the extending direction of the cutting part 2. One end of the cutting part 2 is bent at the imaginary straight line section, and a bent section 21 is formed, so that the temperature sensor 3 mounted on the bent section 21 can abut against the end surface of the cell module 20 with the pressure release valve 203, and the temperature measurement accuracy of the temperature sensor 3 is improved.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The flexible circuit board is used for collecting the temperature of a battery cell module and is characterized by comprising a connector (1) and cutting parts (2), wherein the connector (1) is positioned between the two cutting parts (2); the connector (1) is used for connecting an electrode leading-out sheet (201) of the battery cell module, a temperature sensor (3) is installed on the cutting part (2), and the temperature sensor (3) abuts against the end face of the battery cell module with a pressure release valve (203).

2. The flexible circuit board according to claim 1, wherein the temperature sensor (3) abuts against a region near the pressure relief valve (203) on the end face of the cell module.

3. The flexible circuit board according to claim 1, wherein one end of the cutting part (2) is connected with the flexible circuit board body, and the other end is bent to form a bending section (21); the temperature sensor (3) is arranged on one side of the bending section (21).

4. The flexible circuit board according to claim 3, wherein the bending angle of the bending section (21) is 180 °.

5. The flexible circuit board according to claim 3, characterized in that the other side of the bending section (21) facing away from the temperature sensor (3) is fixedly connected with the flexible circuit board.

6. The flexible circuit board according to claim 1, wherein the flexible circuit board is provided with an insulating sleeve (4) formed by surrounding a plurality of insulating plates, an inner cavity of the insulating sleeve (4) is filled with a sealant layer, and the temperature sensor (3) is encapsulated in the sealant layer.

7. The flexible circuit board according to claim 6, wherein a heat conductive adhesive (5) is coated on the top of the sealant layer, and the temperature sensor (3) abuts against the end surface of the cell module having the pressure relief valve (203) through the heat conductive adhesive (5).

8. The flexible circuit board according to claim 1, wherein the connector (1) is solder-connected with a nickel plate (202) and is connected with the electrode lead-out piece (201) through the nickel plate (202).

9. A battery cell module, characterized by comprising the flexible circuit board of any one of claims 1-8.

10. A battery pack comprising the cell module of claim 9.