CN113745670A

CN113745670A - Flexible circuit board, battery module and battery package

Info

Publication number: CN113745670A
Application number: CN202010462837.3A
Authority: CN
Inventors: 万龙; 彭青波; 任正华; 于坤; 刘林
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-12-03

Abstract

The invention discloses a flexible circuit board, a battery module and a battery pack, wherein the flexible circuit board comprises: carrier membrane and circuit layer, circuit layer locate in the carrier membrane, wherein, carrier membrane has heating zone and signal acquisition region, and the circuit layer includes: the heating circuit is arranged in a heating area and is suitable for heating the battery assembly, the heating temperature acquisition circuit is arranged in the heating area and is used for acquiring the temperature of the heating area, and the battery temperature acquisition circuit and the battery voltage acquisition circuit are arranged in a signal acquisition area and are suitable for acquiring the information of the battery assembly. The flexible circuit board disclosed by the invention is simple in structure, higher in integration degree and lower in cost.

Description

Flexible circuit board, battery module and battery package

Technical Field

The invention relates to the technical field of batteries, in particular to a flexible circuit board, a battery module and a battery pack.

Background

Power battery system among the correlation technique adopts the liquid cooling metal sheet to realize cooling and heating to battery pack usually, perhaps adopts the PTC hot plate to carry out electrical heating to battery pack, and the voltage of battery cell and temperature signal sampling usually adopt FPC pencil mode to go on. However, the heating system of the power battery system and the sampling system of the single battery are separately designed, and the heating system and the sampling system respectively and independently operate, so that the power battery system is complex in structure, complex to assemble, high in cost and low in integration degree.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the flexible circuit board which is simple in structure, high in integration degree and low in cost.

The invention also provides a battery module with the flexible circuit board.

The invention also provides a battery pack with the flexible circuit board or the battery module.

A flexible circuit board according to a first aspect of the present invention includes: the carrier film is provided with a heating area and a signal acquisition area, and the circuit layer comprises: heating circuit, heating temperature acquisition circuit, battery temperature acquisition circuit and battery voltage acquisition circuit, heating circuit locates the zone of heating and be suitable for right battery pack heats, heating temperature acquisition circuit locates the zone of heating and be used for gathering the temperature of the zone of heating, battery temperature acquisition circuit with battery voltage acquisition circuit all locates the district is gathered to the signal and is suitable for the collection battery pack's information.

According to the flexible circuit board disclosed by the invention, the heating circuit, the heating temperature acquisition circuit, the battery temperature acquisition circuit and the battery voltage acquisition circuit are integrated on the circuit layer of the flexible circuit board, so that the integration degree of the flexible circuit board is improved, the product cost is reduced, the assembly is convenient, and the processing efficiency is improved.

In some embodiments, the flexible circuit board further comprises: and the signal acquisition connector is electrically connected with the heating temperature acquisition circuit, the battery temperature acquisition circuit and the battery voltage acquisition circuit respectively.

In some embodiments, the flexible circuit board further comprises: and the heating plug connector is electrically connected with the heating circuit.

In some embodiments, the carrier film has perforations thereon between the heating zone and the signal acquisition zone to separate the heating zone and the signal acquisition zone.

In some embodiments, the battery assembly includes a plurality of single batteries arranged in sequence, the arrangement direction of the single batteries is the thickness direction of the single batteries, the carrier film includes a top film portion and a side film portion connected to each other, the top film portion is located on one side of the width direction of the single batteries, the side film portion is located on one side of the length direction of the single batteries, the heating zone is formed on the top film portion, the heating zone is provided with a first temperature acquisition terminal, the side film portion is provided with a second temperature acquisition terminal and a voltage acquisition terminal, the first temperature acquisition terminal is connected to the heating temperature acquisition circuit, the second temperature acquisition terminal is connected to the battery temperature acquisition circuit, and the voltage acquisition terminal is connected to the battery voltage acquisition circuit.

In some embodiments, the battery assembly further comprises a fixing bracket, the fixing bracket and the side film part are located on the same side in the length direction of the single battery, and the side film part is suitable for being in positioning fit with the fixing bracket through a positioning structure.

In some embodiments, the positioning structure includes a positioning hole and a positioning post, the positioning post is disposed on the fixing support, and the positioning hole is formed in the side film portion.

In some embodiments, the top film part is suitable for being connected with the battery assembly through structural adhesive.

In some embodiments, the heating line, the heating temperature collection line, the battery temperature collection line, and the battery voltage collection line are disposed in the same layer.

A battery module according to a second aspect of the invention includes: the battery pack comprises a plurality of single batteries which are sequentially arranged; the flexible circuit board is the flexible circuit board according to the first aspect of the present invention, the heating circuit is configured to heat the battery assembly, and the battery temperature acquisition circuit and the battery voltage acquisition circuit are both configured to acquire information of the battery assembly.

According to the battery module, the flexible circuit board is simple in structure and convenient to assemble.

A battery pack according to a third aspect of the present invention includes the battery module according to the second aspect of the present invention described above, or includes: the battery pack comprises a plurality of single batteries which are sequentially arranged; the flexible circuit board is the flexible circuit board according to the first aspect of the present invention, the heating circuit is configured to heat the battery assembly, and the battery temperature acquisition circuit and the battery voltage acquisition circuit are both configured to acquire information of the battery assembly.

According to the battery pack, the flexible circuit board or the battery module is adopted, so that the battery pack has good integration degree, simple structure and convenience in assembly.

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

Drawings

FIG. 1 is a schematic diagram of a connection of a flexible circuit board to a battery assembly according to one embodiment of the invention;

FIG. 2 is an enlarged view of portion A circled in FIG. 1;

FIG. 3 is a schematic view of a laminate of the flexible circuit board shown in FIG. 1;

FIG. 4 is an exploded view of FIG. 1;

FIG. 5 is an enlarged view of the portion B circled in FIG. 4;

FIG. 6 is a schematic view of the flexible circuit board shown in FIG. 4;

FIG. 7 is a schematic view of the battery assembly shown in FIG. 4;

fig. 8 is a schematic view of the fixing bracket shown in fig. 7.

Reference numerals:

a battery pack 200, a battery module 100,

A battery component 1, a single battery 11, a fixed bracket 12,

A flexible circuit board 2,

Carrier film 21, perforations 210, heating zone 21a, signal acquisition zone 21b,

A base film 211, a top film 212,

A top film part 213, a side film part 214, a side film sub-part 2141,

A circuit layer 22,

A heating circuit 221, a heating temperature collecting circuit 222,

A battery temperature acquisition line 223, a battery voltage acquisition line 224,

A signal acquisition connector 23,

A heating plug-in unit 24, a positive electrode connecting terminal 241, a negative electrode connecting terminal 242,

A first temperature collecting terminal 25, a second temperature collecting terminal 26, a voltage collecting terminal 27,

A positioning structure 3, a positioning hole 31, a positioning post 32,

And (4) structural adhesive.

Detailed Description

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

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

Next, a flexible circuit board 2 according to an embodiment of the first aspect of the present invention is described with reference to the drawings.

As shown in fig. 1 and fig. 3, the flexible circuit board 2 includes a carrier film 21 and a circuit layer 22, and the circuit layer 22 is disposed in the carrier film 21, so that the carrier film 21 can protect the circuit layer 22 to a certain extent, and at the same time, the flexibility of the flexible circuit board 2 is ensured, and the flexible circuit board has good tensile strength. The carrier film 21 has a heating area 21a and a signal pick-up area 21b, and the wiring layer 22 includes a heating wiring 221, a heating temperature pick-up wiring 222, a battery temperature pick-up wiring 223, and a battery voltage pick-up wiring 224.

Wherein, the heating circuit 221 is disposed in the heating area 21a, the heating circuit 221 is disposed between the bottom base film 211 and the top base film 212 corresponding to the heating area 21a, the heating circuit 221 is suitable for heating the battery assembly 1, so as to ensure that the battery assembly 1 has a proper working temperature, thereby being beneficial to maintaining good charging and discharging performance of the battery assembly 1, and being beneficial to safe use of the battery assembly 1, and when the flexible circuit board 2 is applied in the battery module 100 or the battery pack 200, the battery module 100 or the battery pack 200 can be suitable for low-temperature environments such as alpine regions or winter, and the applicability of the battery module 100 or the battery pack 200 is improved, and since the heating circuit 221 is disposed between the bottom base film 211 and the top base film 212, the heat of the heating circuit 221 can be transferred to the battery assembly 1 through the bottom base film 211 or the top base film 212 in the process of heating the battery assembly 1, and a larger heating area is convenient to realize between the battery assembly 1 and the bottom base film 211 or the top base film 212, so that the heating area of the heating circuit 221 to the battery assembly 1 is convenient to ensure, the battery assembly 1 is heated uniformly, and good heating efficiency is achieved.

Heating temperature gathers circuit 222 and locates heating zone 21a, and heating temperature gathers circuit 222 and is used for gathering the temperature of heating zone 21a, is convenient for realize the monitoring of heating zone 21a temperature, further ensures that battery pack 1 has suitable operating temperature, if heating zone 21a temperature is unusual, is convenient for take certain measure with the safe handling of guaranteeing battery module 100 or battery package 200 to heating circuit 221, and avoids heating zone 21a temperature to lead to the battery pack 1 to damage unusually.

The battery temperature acquisition line 223 and the battery voltage acquisition line 224 are both arranged in the signal acquisition region 21b, and the battery temperature acquisition line 223 and the battery voltage acquisition line 224 are both suitable for acquiring information of the battery assembly 1 so as to monitor the battery assembly 1. For example, the battery temperature collecting line 223 is adapted to collect the temperature of the battery assembly 1, the battery voltage collecting line 224 is adapted to collect the voltage of the battery assembly 1, when the flexible circuit board 2 is applied to the battery module 100 or the battery pack 200, the battery temperature collecting line 223 can collect the temperature information of the battery assembly 1 so as to realize the transmission of the temperature information of the battery assembly 1, and the battery voltage collecting line 224 can collect the voltage information of the battery assembly 1 so as to realize the transmission of the voltage information of the battery assembly 1, so as to ensure the safe use of the battery module 100 or the battery pack 200.

Obviously, compared with the traditional technology, the heating system and the signal acquisition system of the battery assembly are separately designed, so that the heating system and the signal acquisition system respectively and independently operate, namely, the metal plate or the PTC heating plate for heating the battery assembly, the battery temperature acquisition circuit for acquiring battery assembly information and the battery voltage acquisition circuit for acquiring battery assembly information are separately designed and independently operate, and the mode results in complex product structure, higher cost, lower integration degree and complex assembly; in the application, the heating circuit 221 is adopted to heat the battery pack 1, so as to ensure the charging and discharging performance of the battery pack 1, the structure is simple, the cost is low, and the heating circuit 221, the heating temperature acquisition circuit 222, the battery temperature acquisition circuit 223 and the battery voltage acquisition circuit 224 are integrated on the circuit layer 22 of the flexible circuit board 2, so that the integrated arrangement of the heating circuit 221, the heating temperature acquisition circuit 222, the battery temperature acquisition circuit 223 and the battery voltage acquisition circuit 224 is realized, the flexible circuit board 2 has the functions of heating the battery pack 1, acquiring the temperature of the heating area 21a and acquiring the information of the battery pack 1 at the same time, the flexible circuit board 2 can be formed into an integrated FPC, the integration degree of the battery module 100 or the battery pack 200 is improved, the structure of the battery module 100 or the battery pack 200 is compact, and the simplification of the structure of the battery module 100 or the battery pack 200 is facilitated, be convenient for promote machining efficiency, reduce cost, avoided heating circuit 221 simultaneously, heating temperature gathers circuit 222, battery temperature gathers circuit 223 and battery voltage and gathers circuit 224 and set up alone respectively and easily lead to the circuit to walk the line mixed and disorderly to realized the regular arrangement of circuit layer 22, be favorable to saving the equipment process of battery module 100 or battery package 200, promote packaging efficiency, and be convenient for save the equipment cost of labor.

Therefore, according to the flexible circuit board 2 of the embodiment of the present invention, the heating line 221, the heating temperature collecting line 222, the battery temperature collecting line 223, and the battery voltage collecting line 224 are all integrated on the circuit layer 22 of the flexible circuit board 2, so that the integration degree of the flexible circuit board 2 is improved, the cost of the flexible circuit board 2 is reduced, and the assembly process of the flexible circuit board 2 is simplified. When the flexible circuit board 2 is applied to the battery module 100 or the battery pack 200, the integration degree of the battery module 100 or the battery pack 200 is improved, the structure and the assembly process of the battery module 100 or the battery pack 200 are simplified, the assembly is facilitated, the cost is reduced, and the processing efficiency of the battery module 100 or the battery pack 200 is improved.

The heating line 221, the heating temperature collecting line 222, the battery temperature collecting line 223 and the battery voltage collecting line 224 may be insulated from each other to ensure reliable use of the line layer 22.

In the example of fig. 1 and 3, the carrier film 21 includes a base layer base film 211 and a top layer base film 212, and the wiring layer 22 is provided between the base layer base film 211 and the base layer base film 212. Alternatively, the bottom base film 211 may be a PI (polyimide) film, a PET (thermoplastic polyester) film, a PP (polypropylene) film, or the like, and the top base film 212 may be a PI (polyimide) film, a PET (thermoplastic polyester) film, a PP (polypropylene) film, or the like, so as to ensure the toughness and tensile strength of the carrier film 21, and to ensure good insulating property between the circuit layer 22 and the battery assembly 1. Wherein the materials of the bottom base film 211 and the top base film 212 may be the same or different.

In some embodiments, as shown in fig. 1, the flexible circuit board 2 further includes a signal collecting connector 23, the signal collecting connector 23 is electrically connected to the heating temperature collecting line 222, the battery temperature collecting line 223 and the battery voltage collecting line 224 respectively, so that the temperature of the heating area 21a collected by the heating temperature collecting line 222, the information of the battery assembly 1 collected by the battery temperature collecting line 223 and the information of the battery assembly 1 collected by the battery voltage collecting line 224 can be transmitted through the signal collecting connector 23, which saves the collecting connectors needed to be correspondingly arranged on the battery temperature collecting line 223 and the battery voltage collecting line 224, further simplifies the structure of the flexible circuit board 2, and reduces the cost; when the flexible circuit board 2 is applied to the battery module 100 or the battery pack 200, the signal acquisition connector 23 can be connected with other components, so that the connection of the heating temperature acquisition line 222, the battery temperature acquisition line 223 and the battery voltage acquisition line 224 with corresponding structures in sequence is avoided, and the assembly efficiency of the battery module 100 or the battery pack 200 is effectively improved.

For example, in the example of fig. 1, the signal collecting plug 23 may be provided at one side (e.g., the left side in fig. 1) of the wiring layer 22 in the arrangement direction of the plurality of unit cells 11. Of course, the signal collecting connector 23 may be disposed at other positions, but is not limited thereto.

It can be understood that the signal transmitted by the signal acquisition connector 23 includes the temperature of the heating area 21a acquired by the heating temperature acquisition circuit 222, the information of the battery pack 1 acquired by the battery temperature acquisition circuit 223 and the information of the battery pack 1 acquired by the battery voltage acquisition circuit 224, and the above information is low-voltage signals, so that the same signal acquisition connector 23 can be adopted to realize transmission, and then the signal acquisition connector can be a low-voltage acquisition connector.

In some embodiments, as shown in fig. 1, the flexible circuit board 2 further includes a heating plug 24, the heating plug 24 is electrically connected to the heating circuit 221, and when the flexible circuit board 2 is applied to the battery module 100 or the battery pack 200, the heating circuit 221 is conveniently electrically connected to a corresponding power source through the heating plug 24, so that the power source provides power for the heating circuit 221, the heating circuit 221 heats the battery assembly 1, and the assembly of the battery module 100 or the battery pack 200 is facilitated.

It is understood that the voltage of the power signal applied by the power source to the heating line 221 through the heating plug 24 may be set according to actual conditions, for example, the power source applies a high voltage to the heating line 221 through the heating plug 24, and then the heating plug 24 may be a high voltage heating plug. In the description of the present application, "high pressure" and "low pressure" are relative concepts.

The heating plug 24 may include a positive connection terminal 241 and a negative connection terminal 242, the positive connection terminal 241 and the negative connection terminal 242 may be respectively connected to two free ends of the heating line 221, and the positive connection terminal 241 and the negative connection terminal 242 are respectively adapted to be electrically connected to a positive electrode and a negative electrode of a power supply. Wherein the positive connection terminal 241 and the negative connection terminal 242 may be separately and independently disposed from each other (as shown in fig. 1), so that the heating plug 24 may have two plug terminals; of course, the positive connecting terminal 241 and the negative connecting terminal 242 may also be integrated into a plug terminal, and the positive connecting terminal 241 and the negative connecting terminal 242 are insulated from each other.

For example, in the example of fig. 1 and 4, the flexible circuit board 2 includes a signal collection plug 23 and a heating plug 24, the signal collection plug 23 is one, the signal collection plug 23 is electrically connected to the heating temperature collection line 222, the battery temperature collection line 223 and the battery voltage collection line 224 respectively, the heating plug 24 is electrically connected to the heating line 221, the signal collection plug 23 and the heating plug 24 are disposed on the same side of the line layer 22 in the arrangement direction (for example, the left-right direction in fig. 1) of the plurality of single batteries 11, and the signal collection plug 23 and the heating plug 24 are disposed at intervals.

In some embodiments, as shown in fig. 1 and 6, the carrier film 21 has perforations 210 thereon, the perforations 210 being located between the heating zone 21a and the signal acquisition zone 21b, to separate the heating zone 21a and the signal acquisition zone 21b such that the heating zone 21a and the signal acquisition zone 21b are located on either side of the perforation 210, respectively, the contact area between the heating zone 21a and the signal acquisition zone 21b can be reduced, when the heating circuit 221 heats the battery assembly 1, the heat conducted by the carrier film 21 of the heating area 21a (e.g. conducted through the carrier film 21) and radiated to the carrier film 21 of the signal collecting area 21b can be reduced, therefore, the influence of the heat of the heating area 21a on the accuracy of the information acquired by the signal acquisition area 21b is avoided, the information acquired by the battery temperature acquisition circuit 223 and the battery voltage acquisition circuit 224 is ensured to be accurate, and the accurate control of the battery module 100 is facilitated.

Here, the perforation 210 may penetrate through the carrier film 21 in the thickness direction of the carrier film 21, and the perforation 210 may penetrate through the bottom base film 211 and the top base film 212.

For example, in the example of fig. 1 and 6, the perforation 210 may be formed as an elongated hole (e.g., an elongated circular hole, a rectangular hole, etc.), and the heating region 21a and the signal acquisition region 21b are respectively located at both sides (e.g., front and rear sides in fig. 1) of the width of the perforation 210, thereby effectively reducing heat transfer between the heating region 21a and the signal acquisition region 21 b. Wherein, the number of the perforations 210 may be one or more, and when the number of the perforations 210 is plural, the plurality of perforations 210 may be arranged at intervals along the length direction of the connection portion between the heating region 21a and the signal acquisition region 21 b; in the example of fig. 1, the plurality of perforations 210 are arranged at intervals along the arrangement direction of the plurality of unit cells 11, and each perforation 210 extends along the arrangement direction of the plurality of unit cells 11 to form an elongated hole, so that by arranging the plurality of perforations 210, a dispersed arrangement of the perforations 210 is achieved, while reducing heat transfer between the heating area 21a and the signal acquisition area 21b, facilitating ensuring of the connection strength between the carrier film 21 of the heating area 21a and the carrier film 21 of the signal acquisition area 21b, avoiding easy breakage of the carrier film 21, and making the carrier film 21 reliable in use.

In some embodiments, as shown in fig. 1, 4 and 6, the battery assembly 1 includes a plurality of unit cells 11 arranged in sequence, an arrangement direction of the plurality of unit cells 11 is a thickness direction (e.g., a left-right direction in fig. 1) of the unit cells 11, the carrier film 21 includes a top film portion 213, the top film portion 213 is adapted to be located on one side (e.g., an upper side in fig. 1) of the width direction of the unit cells 11, the top film portion 213 may shield at least a part of a side surface of each unit cell 11, and the heating region 21a is formed on the top film portion 213, so that the heating region 21a may cover at least a part of the side surface of the unit cell 11, so as to ensure a heating area of the heating region 21a on the battery assembly 1 and improve a heating rate. Wherein, heating zone 21a is equipped with first temperature acquisition terminal 25, and first temperature acquisition terminal 25 links to each other with heating temperature acquisition circuit 222, then first temperature acquisition terminal 25 can correspond the setting with the temperature acquisition point of heating zone 21a to realize the collection of the heating zone 21a temperature signal, heating temperature acquisition circuit 222 passes through the temperature of first temperature acquisition terminal 25 collection heating zone 21a promptly.

One or more first temperature acquisition terminals 25 may be provided, and the arrangement position of the first temperature acquisition terminal 25 in the heating area 21a may be specifically set according to the actual application. For example, in the example of fig. 1 and 6, the first temperature acquisition terminal 25 is plural, and then the corresponding temperature acquisition point is plural, the plural temperature acquisition points are arranged at intervals, so as to more accurately monitor the temperature of the heating area 21a, and the plural first temperature acquisition terminals 25 are arranged adjacent to the edge of the heating area 21a (for example, the edge of the heating area 21a connected to the signal acquisition area 21 b); the arrangement of the first temperature collecting terminals 25 may be in a "straight" shape or multiple rows and multiple columns, but is not limited thereto. Of course, the first temperature-collecting terminal 25 may also be located in the middle region of the heating region 21 a.

As shown in fig. 1, 2, 5 and 6, the carrier film 21 further includes a side film portion 214 connected to the top film portion 213, the side film portion 214 is adapted to be located at one side (e.g., the front side in fig. 1) of the length direction of the unit cells 11, for example, the side film portion 214 may block at least part of the side surface of each unit cell 11; the top film part 213 and the side film part 214 are not located in the same plane, and the top film part 213 and the side film part 214 are connected in a bending way, so that the carrier film 21 can be better matched with the battery assembly 1; the side membrane part 214 is provided with a second temperature acquisition terminal 26 and a voltage acquisition terminal 27, the second temperature acquisition terminal 26 is connected with a battery temperature acquisition line 223, the voltage acquisition terminal 27 is connected with a battery voltage acquisition line 224, the battery temperature acquisition line 223 acquires the temperature of the single battery 11 through the second temperature acquisition terminal 26, and the battery voltage acquisition line 224 acquires the voltage of the single battery 11 through the voltage acquisition terminal 27.

The number of the voltage collecting terminals 27 may be multiple, and the arrangement of the multiple voltage collecting terminals 27 may be specifically set according to the connection mode of the multiple single batteries 11, actual monitoring requirements, and the like. The number of the second temperature collecting terminals 26 may be one or more, in the example of fig. 6, the side film portion 214 includes a plurality of side film sub-portions 2141, the plurality of side film sub-portions 2141 are arranged at intervals along the arrangement direction of the plurality of single batteries 11, and during the installation of the flexible circuit board 2, the plurality of side film sub-portions 2141 may be sequentially folded to one side of the length direction of the single batteries 11, so that the folding of the side film portion 214 is facilitated, and the assembly of the flexible circuit board 2 is facilitated; each side membrane sub-portion 2141 is disposed corresponding to at least two of the plurality of single batteries 11, and each side membrane sub-portion 2141 is provided with a second temperature collecting terminal 26, and the second temperature collecting terminal 26 is disposed on a side of the corresponding side membrane sub-portion 2141 facing the single batteries 11 to collect the temperature of the corresponding single battery 11; of course, the number of the second temperature collection terminals 26 may also be smaller than the number of the side membrane sub-portions 2141, for example, the number of the side membrane sub-portions 2141 is five, and at this time, the number of the second temperature collection terminals 26 may be three or four, so as to save the number of the second temperature collection terminals 26 and simplify the structure.

Alternatively, the voltage collecting terminal 27 is a nickel plate terminal, which may be adhered to the side film part 214; the first and second temperature-collecting

terminals

25 and 26 may be selected as NTC temperature-collecting terminals.

As shown in fig. 1, the area of the carrier film 21 corresponding to the heating area 21a is smaller than that of the top film portion 213, that is, a portion of the top film portion 213 corresponds to the heating area 21a, and another portion of the top film portion 213 and the side film portion 214 correspond to the signal acquisition area 21 b. Of course, the area of the carrier film 21 corresponding to the heating area 21a may also be equal to the area of the top film portion 213.

In the example of fig. 1 and 6, the battery assembly 1 includes a plurality of unit cells 11, the plurality of unit cells 11 are sequentially arranged along a thickness direction (e.g., a left-right direction in fig. 1) of the unit cells 11, the carrier film 21 includes a top film portion 213 and a side film portion 214 connected to each other, the top film portion 213 is located on one side of the width direction of the unit cells 11, the side film portion 214 is located on one side of the length direction of the unit cells 11, the heating region 21a is formed on the top film portion 213, the signal acquisition region 21b is formed at least on the side film portion 214, the carrier film 21 has a perforation 210 thereon, the perforation 210 is partitioned between the heating region 21a and the signal acquisition region 21b, and the perforation 210 is spaced from the bent connection of the top film portion 213 and the side film portion 214, so that the distance between the heating region 21a and the side film portion 214 is large, and the heat transferred from the heating region 21a to the side film portion 214 is effectively reduced; if the heating line 221, the heating temperature collection line 222, the battery temperature collection line 223, and the battery voltage collection line 224 are all disposed on the side film portion 214, the amount of heat transferred from the heating area 21a to the battery temperature collection line 223 and the battery voltage collection line 224 is further reduced, and the accuracy of the information collected by the battery temperature collection line 223 and the battery voltage collection line 224 is further improved.

In some embodiments, as shown in fig. 1, fig. 2, and fig. 4, the battery assembly 1 further includes a fixing support 12, the fixing support 12 and the side film portion 214 are located on the same side of the length direction of the single battery 11, the side film portion 214 is suitable for being in positioning fit with the fixing support 12 through the positioning structure 3, so as to stably mount the side film portion 214 on the fixing support 12, facilitate the mounting of the flexible circuit board 2, and facilitate the proper distance between the side film portion 214 and the single battery 11, facilitate the corresponding setting of the second temperature collecting terminal 26 and the temperature collecting point of the battery assembly 1, and facilitate the corresponding setting of the voltage collecting terminal 27 and the voltage collecting point of the battery assembly 1.

Wherein, the number of the fixing supports 12 can be one or more, and each fixing support 12 can correspond to one or more positioning structures 3. In the example of fig. 2 and 5, the number of the single batteries 11 is multiple, the multiple single batteries 11 are sequentially arranged along the thickness direction of the single batteries 11, the number of the fixing brackets 12 is multiple, the multiple fixing brackets 12 are all located on one side (for example, the front side in fig. 1) of the length direction of the single batteries 11, each fixing bracket 12 is arranged corresponding to the multiple positioning structures 3, and it is beneficial to improve the positioning effect between the fixing bracket 12 and the side film portion 214.

In some embodiments, as shown in fig. 2, the positioning structure 3 includes a positioning hole 31 and a positioning column 32, the positioning column 32 is disposed on the fixing support 12 so as to ensure the structural strength and stability of the positioning column 32, the positioning hole 31 is formed on the side film portion 214, and the positioning column 32 is disposed through the positioning hole 31 to limit the relative position between the side film portion 214 and the fixing support 12, so as to achieve the positioning fit between the fixing support 12 and the side film portion 214. Therefore, the positioning structure 3 is simple in structure and convenient to process.

In the example of fig. 2 and 5, the positioning posts 32 may extend linearly from the fixing support 12 in a direction away from the unit cells 11 to facilitate quick location-fitting of the side film portions 214 on the fixing support 12.

Of course, the positioning structure 3 is not limited thereto, and it is only necessary to ensure that the fixing support 12 and the side film portion 214 can be positioned and matched by the positioning structure 3.

In some embodiments, as shown in fig. 4 and 5, the top film portion 213 is suitable for being bonded to the battery assembly 1 through the structural adhesive 4, so that the connection between the top film portion 213 and the battery assembly 1 is facilitated, the assembly efficiency is further improved, and meanwhile, the top film portion 213 is securely mounted on the battery assembly 1, the reliable mounting of the flexible circuit board 2 is realized, and the reliable use of the battery module 100 or the battery pack 200 is ensured. In addition, on the premise of ensuring that the top film part 213 is reliably mounted, the thickness of the structural adhesive 4 is conveniently set to be thinner, and the heating rate of the top film part 213 to the battery assembly 1 is ensured.

Of course, the top film 213 and the battery module 1 may be adhered and connected by other adhesive, such as double-sided tape.

In the example of fig. 5, the structural adhesive 4 between the top film portion 213 and the battery assembly 1 forms a plurality of adhesive members, the plurality of adhesive members are arranged at intervals, and each adhesive member extends along the arrangement direction of the plurality of single batteries 11, so as to improve the bonding firmness between the top film portion 213 and the battery assembly 1, facilitate the saving of the amount of the structural adhesive 4, and reduce the cost. Of course, the structural adhesive 4 between the top film part 213 and the battery assembly 1 may also form an integral adhesive piece.

Alternatively, since the heating area 21a is formed on the top film portion 213, and the area of the carrier film 21 corresponding to the heating area 21a is smaller than or equal to the area of the top film portion 213, the structural adhesive 4 may be used to adhesively connect the top film portion 213 corresponding to the heating area 21a to the battery assembly 1, or the structural adhesive 4 may be used to adhesively connect the top film portion 213 corresponding to the heating area 21a and the portion of the top film portion 213 except for the heating area 21a to the battery assembly 1, respectively; in other words, the structural adhesive 4 may be provided only on the top film portion 213 corresponding to the heating area 21a, or the structural adhesive 4 may be provided not only on the top film portion 213 corresponding to the heating area 21a but also on a portion of the top film portion 213 other than the heating area 21 a.

For example, in the example of fig. 1 and 4, the carrier film 21 includes a top film portion 213 and a side film portion 214 connected to each other, the top film portion 213 is adhesively connected to the battery assembly 1 through the structural adhesive 4, and the side film portion 214 is in positioning fit with the fixing bracket 12 through the positioning structure 3, so that the flexible circuit board 2 is reliably mounted on the battery assembly 1, and the flexible circuit board 2 is easily assembled with the battery assembly 1.

In some embodiments, as shown in fig. 3, the heating line 221, the heating temperature collecting line 222, the battery temperature collecting line 223 and the battery voltage collecting line 224 are disposed in the same layer, and the heating line 221, the heating temperature collecting line 222, the battery temperature collecting line 223 and the battery voltage collecting line 224 are not stacked, so that the stacking process of the heating line 221, the heating temperature collecting line 222, the battery temperature collecting line 223 and the battery voltage collecting is saved, and the heating line 221, the heating temperature collecting line 222, the battery temperature collecting line 223 and the battery voltage collecting line 224 are formed in the same process, so that the processing time of the line layer 22 is saved, and the manufacturing efficiency of the line layer 22 is improved.

For example, in the example of fig. 3, the heating line 221, the heating temperature collecting line 222, the battery temperature collecting line 223, and the battery voltage collecting line 224 are integrally formed on the same circuit layer 22 by etching, the process is simple, and the efficiency is high, and at this time, the heating line 221, the heating temperature collecting line 222, the battery temperature collecting line 223, and the battery voltage collecting line 224 may be disposed at intervals to achieve insulation. For example, a metal layer can be arranged on the bottom base film 211, the metal layer is integrally etched to form the circuit layer 22, then the top base film 212 is covered on the circuit layer 22, and the flexible circuit board 2 is integrally manufactured by cold pressing and hot pressing processes and curing pressure-sensitive adhesive, so that the flexible circuit board 2 is ensured to form a whole, the structure strength and flexibility are good, meanwhile, the manufacturing cost is saved, and the production efficiency is improved. The metal layer may be a copper foil, which is convenient for ensuring the conductivity of the circuit layer 22.

Of course, at least two of the heating line 221, the heating temperature collecting line 222, the battery temperature collecting line 223, and the battery voltage collecting line 224 may also be stacked, and insulation may be achieved by providing an insulating layer between the stacked at least two.

The battery module 100 according to the second aspect of the present invention includes a battery assembly 1 and a flexible circuit board 2, the battery assembly 1 includes a plurality of single batteries 11 arranged in sequence, the flexible circuit board 2 is the flexible circuit board 2 according to the first aspect of the present invention, a heating circuit 221 is used for heating the battery assembly 1, and a battery temperature collecting circuit 223 and a battery voltage collecting circuit 224 are both used for collecting information of the battery assembly 1. The battery module 100 may be applied to a new energy vehicle, but is not limited thereto.

In the example of fig. 1, the plurality of unit batteries 11 are arranged in sequence along the thickness direction (e.g., the left-right direction in fig. 1) of the unit batteries 11, and the plurality of unit batteries 11 may be arranged in series and/or in parallel, including the following cases: 1. the plurality of single batteries 11 are connected in series, which is beneficial to ensuring the output voltage of the battery component 1; 2. the plurality of single batteries 11 are connected in parallel, so that the output current of the battery assembly 1 is ensured; 3. the plurality of unit batteries 11 are connected in series and in parallel, at least two of the plurality of unit batteries 11 are connected in series, and at least two of the plurality of unit batteries 11 are connected in parallel, so as to ensure the output voltage and the output current of the battery assembly 1. The meaning of "plurality" in the description of the present application is two or more.

Wherein, the heating circuit 221 is used for heating the battery pack 1, the battery temperature acquisition circuit 223 and the battery voltage acquisition circuit 224 are all used for acquiring the information of the battery pack 1, and the heating circuit 221, the heating temperature acquisition circuit 222, the battery temperature acquisition circuit 223 and the battery voltage acquisition circuit 224 are all integrated on the circuit layer 22 of the flexible circuit board 2, the integration degree of the battery module 100 is improved, the structure and the assembly process of the battery module 100 are simplified, and the processing efficiency is improved.

Each of the single batteries 11 has a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal of each of the single batteries 11 may be both located on the same side in the length direction (for example, the front-back direction in fig. 1) of the single battery 11, or the positive electrode terminal and the negative electrode terminal of each of the single batteries 11 may be also located on different sides in the length direction of the single battery 11.

Therefore, the battery module 100 according to the embodiment of the present invention has a good integration degree, a simple structure and an easy assembly by using the flexible circuit board 2.

Other constructions and operations of the battery module 100 according to the embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

The battery pack 200 according to the embodiment of the third aspect of the invention includes the battery module 100 according to the embodiment of the second aspect of the invention described above; alternatively, the battery pack 200 according to the third embodiment of the invention includes a battery assembly 1 and a flexible circuit board 2, the battery assembly 1 includes a plurality of single batteries 11 arranged in sequence, the flexible circuit board 2 is the flexible circuit board 2 according to the first embodiment of the invention, the heating circuit 221 is used for heating the battery assembly 1, and the battery temperature collecting circuit 223 and the battery voltage collecting circuit 224 are both used for collecting information of the battery assembly 1. The battery pack 200 may be applied to a new energy vehicle, but is not limited thereto.

Therefore, the battery pack 200 according to the embodiment of the present invention has a good integration degree, a simple structure, and is easy to assemble by using the flexible circuit board 2 or the battery module 100.

In other words, the flexible circuit board 2 according to the above-described first aspect of the present application may be directly used for the battery pack 200 (or power battery system), in which case the structure of the battery pack 200 may be omitted, for example, the end plates, side plates, etc. of the battery module may be omitted with respect to the arrangement of the entire battery module; alternatively, the flexible circuit board 2 according to the foregoing first aspect of the present application may also be indirectly used for the battery pack 200, for example, the battery module 100 having the flexible circuit board 2 is applied to the battery pack 200, that is, the battery module 100 according to the foregoing second aspect of the present application is used for the battery pack 200, so as to facilitate the integrated setting of the thermal management and the information acquisition of the battery pack 200, facilitate the simplification of the structure of the battery pack 200, and facilitate the assembly.

The battery module 100 according to the embodiment of the present invention will be described in detail in one specific embodiment with reference to fig. 1 to 8. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.

As shown in fig. 1 to 3, the battery module 100 includes a battery assembly 1 and a flexible circuit board 2, the battery assembly 1 includes a plurality of single batteries 11 and a plurality of fixing brackets 12, the plurality of single batteries 11 are arranged along the left-right direction, the plurality of fixing brackets 12 are all disposed at the front side of the plurality of single batteries 11, and each fixing bracket 12 is disposed corresponding to the plurality of single batteries 11.

The flexible circuit board 2 is arranged on the battery component 1, the flexible circuit board 2 comprises a carrier film 21, a circuit layer 22, a signal acquisition connector 23 and a heating connector 24, the carrier film 21 comprises a bottom base film 211 and a top base film 212, the circuit layer 22 is arranged between the bottom base film 211 and the top base film 212, the carrier film 21 is provided with a heating area 21a and a signal acquisition area 21b, the circuit layer 22 comprises a heating circuit 221 arranged on the same layer, a heating temperature acquisition circuit 222, a battery temperature acquisition circuit 223 and a battery voltage acquisition circuit 224, the circuit layer 22 is a copper foil circuit, the heating circuit 221, the heating temperature acquisition circuit 222, the battery temperature acquisition circuit 223 and the battery voltage acquisition circuit 224 are integrally etched and formed.

The heating circuit 221 is arranged in the heating area 21a and is used for heating the battery assembly 1, the heating temperature acquisition circuit 222 is arranged in the heater 21a and is used for acquiring the temperature of the heater 21a, the battery temperature acquisition circuit 223 and the battery voltage acquisition circuit 224 are both arranged in the signal acquisition area 21b, the battery temperature acquisition circuit 223 is used for acquiring the temperature of the battery assembly 1, and the battery voltage acquisition circuit 224 is used for acquiring the voltage of the battery assembly 1; the number of the signal collection plug-in units 23 is one, the signal collection plug-in units 23 are electrically connected with the heating temperature collection line 222, the battery temperature collection line 223 and the battery voltage collection line 224 respectively, the number of the heating plug-in units 24 is one, and the heating plug-in units 24 are electrically connected with the heating line 221.

The carrier film 21 comprises a top film part 213 and a side film part 214 which are connected, the top film part 213 is positioned at the upper side of the battery assembly 1, the top film part 213 and the battery assembly 1 are connected by sticking through a structural adhesive 4, the side film part 214 is positioned at the front side of the battery assembly 1, the side film part 214 is matched with the fixing support 12 in a positioning way, a heating zone 21a is formed at the top film part 213, and the area of the heating zone 21a occupies 50% -80% of the upper surface of the battery assembly 1; the carrier film 21 has a plurality of perforations 210, the plurality of perforations 210 are arranged at intervals in the left-right direction, each perforation 210 extends in the left-right direction, such that the plurality of perforations 210 are spaced between the heating region 21a and the signal acquisition region 21b, and each perforation 210 is spaced from the connection between the top film portion 213 and the side film portion 214, such that each perforation 210 is spaced from the edge of the top film portion 213.

Wherein, heating zone 21a is equipped with a plurality of first temperature acquisition terminals 25, and a plurality of first temperature acquisition terminals 25 set up along left and right direction interval, and a plurality of first temperature acquisition terminals 25 are close to perforation 210 and set up, and first temperature acquisition terminal 25 links to each other with heating temperature acquisition circuit 222.

The side film portion 214 includes a plurality of side film portions 2141, the plurality of side film portions 2141 are disposed at intervals in the left-right direction, each side film portion 2141 is disposed corresponding to the plurality of fixing brackets 12, and each side film portion 2141 is in positioning fit with the corresponding plurality of fixing brackets 12 through the positioning structure 3. Each side membrane sub-portion 2141 is provided with a second temperature collecting terminal 26 and a plurality of voltage collecting terminals 27, the second temperature collecting terminal 26 is connected to the battery temperature collecting line 223, the voltage collecting terminal 27 is connected to the battery voltage collecting line 224, and the voltage collecting terminal 27 is electrically connected to the poles of the single batteries 11.

Therefore, the battery module 100 according to the embodiment of the invention has the advantages of high integration degree, simple structure, low cost and convenient assembly.

In the description of the present invention, it is to be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A flexible circuit board, comprising:

the carrier film is provided with a heating area and a signal acquisition area, and the circuit layer comprises: heating circuit, heating temperature acquisition circuit, battery temperature acquisition circuit and battery voltage acquisition circuit, heating circuit locates the zone of heating and be suitable for the heating to battery pack, heating temperature acquisition circuit locates the zone of heating and be used for gathering the temperature of the zone of heating, battery temperature acquisition circuit with battery voltage acquisition circuit all locates the district is gathered to the signal and be suitable for the collection battery pack's information.

2. The flexible circuit board of claim 1, further comprising:

and the signal acquisition connector is electrically connected with the heating temperature acquisition circuit, the battery temperature acquisition circuit and the battery voltage acquisition circuit respectively.

3. The flexible circuit board of claim 1, further comprising:

and the heating plug connector is electrically connected with the heating circuit.

4. The flexible circuit board of claim 1, wherein the carrier film has perforations thereon between the heating zone and the signal acquisition zone to separate the heating zone and the signal acquisition zone.

5. The flexible circuit board of claim 1, wherein the battery assembly includes a plurality of single batteries arranged in sequence, the arrangement direction of the plurality of single batteries is the thickness direction of the single batteries, the carrier film includes a top film portion and a side film portion connected to each other, the top film portion is located on one side of the width direction of the single batteries, the side film portion is located on one side of the length direction of the single batteries, the heating region is formed on the top film portion, the heating region is provided with a first temperature acquisition terminal, the side film portion is provided with a second temperature acquisition terminal and a voltage acquisition terminal, the first temperature acquisition terminal is connected to the heating temperature acquisition circuit, the second temperature acquisition terminal is connected to the battery temperature acquisition circuit, and the voltage acquisition terminal is connected to the battery voltage acquisition circuit.

6. The flexible circuit board of claim 5, wherein the battery assembly further comprises a fixing bracket, the fixing bracket and the side film portion are located on the same side of the length direction of the single battery, and the side film portion is adapted to be in positioning fit with the fixing bracket through a positioning structure.

7. The flexible circuit board of claim 6, wherein the positioning structure comprises a positioning hole and a positioning post, the positioning post is disposed on the fixing support, and the positioning hole is formed in the side film portion.

8. The flexible circuit board of claim 5, wherein the top film portion is adapted to be adhesively coupled to the battery assembly via a structural adhesive.

9. The flexible circuit board according to any one of claims 1 to 8, wherein the heating line, the heating temperature collecting line, the battery temperature collecting line, and the battery voltage collecting line are provided in the same layer.

10. A battery module, comprising:

the battery pack comprises a plurality of single batteries which are sequentially arranged;

the flexible circuit board according to any one of claims 1 to 9, wherein the heating circuit is configured to heat the battery assembly, and the battery temperature acquisition circuit and the battery voltage acquisition circuit are both configured to acquire information of the battery assembly.

11. A battery pack comprising the battery module according to claim 10, or comprising: