Battery module

Abstract

The utility model discloses a battery module which comprises a plurality of battery monomers arranged in sequence, a plurality of conductive confluence metal sheets electrically connected with the battery monomers and an output connecting terminal used for transmitting battery signals collected from the battery monomers outwards, and each battery monomer is electrically connected with at least one conductive confluence metal sheet. A plurality of signal transmission wires are laid on the surface, facing the upper base film, of the lower base film, one end of each signal transmission wire is electrically connected with the output connecting terminal, and the other end of each signal transmission wire extends to the position below any conductive bus metal sheet or sensing chip and forms a coil area through spiral wiring. According to the battery module disclosed by the utility model, on the basis of realizing real-time acquisition and monitoring on the state of the single batteries, the area of a connecting area of the signal transmission wire, the conductive bus metal sheet and the sensing chip can be increased, and the effectiveness and the stability of connection are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicle batteries, in particular to a battery module. Background Art

[0002] In the research and development of power battery technology, the control of various parameters of power batteries is crucial. Existing electric vehicle batteries connect various parts of the battery pack to the system controller through an integrated busbar to obtain the parameters of each part of the battery pack, including voltage, current, temperature and other parameters.

[0003] At present, the parameter transmission carriers of integrated busbars used to collect parameter signals such as battery module temperature and pressure on the market mainly include wire harness, FPC (Flexible Printed Circuit) and FFC (Flexible Flat Cable). Among them, FPC has the characteristics of small size, light weight, easy processing and welding, good heat dissipation, etc. FFC is an upgraded version of wire harness, which is arranged in parallel in strips and also has the advantages of soft texture, small thickness, and easy electromagnetic shielding.

[0004] However, using the wiring harness as a carrier for transmitting the integrated busbar parameters will result in a large number of wiring harnesses on the integrated busbar, making the overall wiring harness of the integrated busbar redundant and causing difficulties in the wiring harness assembly process; the processing technology of FPC and FFC is complex and costly, and will also cause great waste and environmental pollution. The degree of waste and pollution will increase significantly with the increase in the size of the integrated busbar, which is inconsistent with the development needs of increasingly higher requirements for vehicle endurance and an increasing number of battery cells. Utility Model Content

[0005] The utility model aims to provide a battery module which can increase the area of ​​the connection between the signal transmission wire and the conductive bus metal sheet and the sensor chip on the basis of realizing real-time acquisition and monitoring of the status of the battery cell, thereby ensuring the effectiveness and stability of the connection.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a battery module, comprising: a plurality of battery cells arranged in sequence, a plurality of conductive busbar metal sheets electrically connected to the battery cells, and output connection terminals for transmitting battery signals collected from the battery cells to the outside, each of the battery cells is electrically connected to at least one conductive busbar metal sheet, and also has a stacked lower base film, an upper base film, and a plurality of sensor chips for sensing the state of the battery cells, and a plurality of signal transmission wires are laid on the surface of the lower base film facing the upper base film;

[0007] One end of each of the signal transmission wires is electrically connected to the output connection terminal, and the other end of the signal transmission wire extends to the bottom of any conductive bus metal sheet or sensor chip and forms a coil area by spiral routing. The coil area is connected to the conductive bus metal sheet or sensor chip directly above it by soldering, and each of the conductive bus metal sheet and sensor chip is electrically connected to at least one signal transmission wire, and each of the signal transmission wires is laid in a wave shape between the upper base film and the lower base film.

[0008] The further improved scheme in the above technical scheme is as follows:

[0009] 1. In the above scheme, the signal transmission wire is laid in a sinusoidal wave shape.

[0010] 2. In the above solution, the coil area is a circular coil area or a rectangular coil area.

[0011] 3. In the above solution, the signal transmission wire further includes a metal wire and an insulating layer covering the outside of the metal wire.

[0012] 4. In the above solution, the metal wire is a round copper wire.

[0013] 5. In the above solution, a positioning hole is provided at each of the four corners of the lower base film and the upper base film, and positioning posts cooperating with the positioning holes are provided on the battery cells arranged at both ends.

[0014] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0015] The utility model battery module comprises a stacked lower base film, an upper base film and a plurality of sensor chips for sensing the state of a battery cell. A plurality of signal transmission wires are laid on the surface of the lower base film facing the upper base film. One end of each of the signal transmission wires is electrically connected to an output connection terminal. The other end of the signal transmission wire extends to the bottom of any conductive bus metal sheet or sensor chip and forms a coil area by spiral routing. The coil area is connected to the conductive bus metal sheet or sensor chip located directly above it by soldering. Each of the conductive bus metal sheet and sensor chip is electrically connected to at least one signal transmission wire. On the basis of realizing real-time acquisition and monitoring of the state of the battery cell, the signal transmission wires with consistent wire diameters are laid by printing. The signal connection between the conductive busbar metal sheet, the sensor chip and the output connection terminal at the battery signal acquisition end is realized between the two base films, which can not only improve the efficiency of production and processing, but also avoid the material waste and chemical pollution caused by subtractive processing in the prior art, thereby saving costs. The area of ​​the connection area between the signal transmission wire and the conductive busbar metal sheet and the sensor chip is greatly increased by spiral routing, which is convenient for the connection between the two and can ensure the effectiveness and stability of the connection, thereby further improving the overall stability of the busbar; further, each of the signal transmission wires is laid in a wavy shape between the upper base film and the lower base film. By setting the direction of the wavy signal transmission wire, the stability and anti-interference of the signal transmission are improved without increasing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 This is a schematic diagram of the structure of the battery module of the utility model;

[0017] Attached Figure 2 It is a partial structural schematic diagram of the battery module of the utility model;

[0018] Attached Figure 3 For attachment Figure 2 Schematic diagram of the cross section along AA;

[0019] Attached Figure 4 For the utility model Figure 3 The enlarged schematic diagram of point B in the middle;

[0020] Attached Figure 5 This is a schematic diagram of the structure of the upper base film of the battery module of the utility model;

[0021] Attached Figure 6 This is a partial structural schematic diagram of Example 1 of the battery module of the utility model;

[0022] Attached Figure 7 It is a partial structural schematic diagram of Example 2 of the battery module of the utility model.

[0023] In the above figures: 1. Battery cell; 2. Signal transmission wire; 21. Metal wire; 22. Insulation layer; 3. Conductive bus metal sheet; 4. Conductive metal sheet; 5. Sensor chip; 6. Output connection terminal; 7. Positioning hole; 8. Lower base film; 9. Upper base film; 10. First avoidance through hole; 11. Second avoidance through hole; 12. Welding hole; 13. Coil area; 14. Positioning column; 15. Adhesive layer. DETAILED DESCRIPTION

[0024] The present invention can be further understood through the specific embodiments given below, but they are not intended to limit the present invention.

[0025] Embodiment 1: A battery module, comprising: a plurality of battery cells 1 arranged in sequence, a plurality of conductive bus metal sheets 3 electrically connected to the battery cells 1, and output connection terminals 6 for transmitting battery signals collected from the battery cells 1 to the outside, each of the battery cells 1 being electrically connected to at least one conductive bus metal sheet 3, and also having a stacked lower base film 8, an upper base film 9, and a plurality of sensor chips 5 for sensing the state of the battery cells 1, and a plurality of signal transmission wires 2 being laid on the surface of the lower base film 8 facing the upper base film 9;

[0026] One end of each of the signal transmission wires 2 is electrically connected to the output connection terminal 6, and the other end of the signal transmission wire 2 extends to the bottom of any conductive bus metal sheet 3 or sensor chip 5 and forms a coil area 13 by spiral routing. The coil area 13 is connected to the conductive bus metal sheet 3 or sensor chip 5 located directly above it by soldering. Each of the conductive bus metal sheet 3 and sensor chip 5 is electrically connected to at least one signal transmission wire 2, and each of the signal transmission wires 2 is laid in a wave shape between the upper base film 9 and the lower base film 8.

[0027] The signal transmission conductor 2 is laid in a sinusoidal wave shape.

[0028] The coil area 13 is a circular coil area.

[0029] The signal transmission wire 2 further includes a metal wire 21 and an insulating layer 22 covering the outside of the metal wire 21 . The metal wire 21 is a round copper wire.

[0030] A positioning hole 7 is provided at each of the four corners of the lower base film 8 and the upper base film 9 , and positioning posts 14 cooperating with the positioning holes 7 are provided on the battery cells 1 arranged at both ends.

[0031] The diameter of the metal wire 21 is 210 μm.

[0032] Embodiment 2: A battery module, comprising: a plurality of battery cells 1 arranged in sequence, a plurality of conductive bus metal sheets 3 electrically connected to the battery cells 1, and output connection terminals 6 for transmitting battery signals collected from the battery cells 1 to the outside, each of the battery cells 1 being electrically connected to at least one conductive bus metal sheet 3, and also having a stacked lower base film 8, an upper base film 9, and a plurality of sensor chips 5 for sensing the state of the battery cells 1, and a plurality of signal transmission wires 2 being laid on the surface of the lower base film 8 facing the upper base film 9;

[0033] One end of each of the signal transmission wires 2 is electrically connected to the output connection terminal 6, and the other end of the signal transmission wire 2 extends to the bottom of any conductive bus metal sheet 3 or sensor chip 5 and forms a coil area 13 by spiral routing. The coil area 13 is connected to the conductive bus metal sheet 3 or sensor chip 5 located directly above it by soldering. Each of the conductive bus metal sheet 3 and sensor chip 5 is electrically connected to at least one signal transmission wire 2, and each of the signal transmission wires 2 is laid in a wave shape between the upper base film 9 and the lower base film 8.

[0034] The coil area 13 is a rectangular coil area.

[0035] The diameter of the metal wire 21 is 700 μm.

[0036] The output connection terminal 6 is disposed in the middle of one end of the lower base film 8 , and the ends of the plurality of signal transmission wires 2 connected to the output connection terminal 6 are disposed at equal intervals in the width direction of the lower base film 8 .

[0037] The sensor chip 5 is a temperature sensor chip and a voltage sensor chip.

[0038] The signal transmission wire 2 is bonded to the lower base film 8 via an adhesive layer 15 .

[0039] The plurality of conductive bus metal sheets 3 and the plurality of sensor chips 5 are disposed between the lower base film 8 and the upper base film 9 .

[0040] The upper base film 9 is provided with a plurality of first avoidance through holes 10 for embedding the conductive bus metal sheet 3 and a plurality of second avoidance through holes 11 for embedding the sensor chip 5 .

[0041] One end of a conductive metal sheet 4 is electrically connected to the conductive bus metal sheet 3 exposed from the first avoidance through hole 10, and the other end of the conductive metal sheet 4 extends to the outside of the lower base film 8 and the upper base film 9 and is provided with a welding hole 12. The electrode column on the battery cell 1 passes through the welding hole 12 and is welded to the conductive metal sheet 4 by solder.

[0042] As for the adhesive layer, the adhesive layer can be obtained by coating on the lower base film, the metal wire can be printed on the adhesive layer that has not yet been completely cured, and then the upper base film can be covered and bonded to the other side of the printed metal wire; or the metal wire to be printed can be first passed through the adhesive and then printed on the lower base film, thereby forming an adhesive layer to achieve the connection and fixation between the upper and lower base films and the metal wire;

[0043] Compared with the prior art that uses FPC to obtain metal wires and fixed routing shapes through chemical etching and uses FFC to obtain millimeter-level aluminum metal wires or tinned metal wires with fixed routing shapes through processes such as embossing, the present application uses copper wires to be laid by printing, and no material waste or pollution will be generated during the processing process. Any routing shape can be obtained by setting the printing route without increasing any cost, especially the transition at the bend can be more natural to ensure the stability and consistency of signal transmission. Therefore, a coil area is formed by spiral routing at the connection between the signal transmission wire and the conductive bus metal sheet and the sensor chip, and then an electrical connection is made through soldering, thereby increasing the area of ​​the connection area between the signal transmission wire and the conductive bus metal sheet and the sensor chip, which is convenient for the connection between the two and can ensure the effectiveness and stability of the connection, thereby further improving the overall stability of the busbar; in particular, by setting the direction of the wavy signal transmission wire, the stability and anti-interference of the signal transmission are improved without increasing the production cost, thereby obtaining a product with better overall flexibility, stability and bending resistance, and the process is simple, the processing cost is low, and the processing cost will not increase significantly with the increase of the product size.

[0044] When the above-mentioned battery module is used, on the basis of realizing real-time collection and monitoring of the status of the battery cells, the signal transmission wires with consistent wire diameters are laid between the two base films by printing, and thereby the signal connection between the conductive bus metal sheet, the sensor chip and the output connection terminal at the battery signal collection end is realized, which can not only improve the efficiency of production and processing, but also avoid material waste and chemical pollution caused by subtractive processing in the prior art, thereby saving costs. The area of ​​the connection area between the signal transmission wire and the conductive bus metal sheet and the sensor chip is greatly increased by spiral routing, which is convenient for the connection between the two, and can ensure the effectiveness and stability of the connection, thereby further improving the overall stability of the busbar; further, by setting the direction of the wavy signal transmission wire, the stability and anti-interference of the signal transmission are improved without increasing the production cost.

[0045] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery module, comprising: A plurality of battery cells (1) arranged in sequence, a plurality of conductive busbar metal sheets (3) electrically connected to the battery cells (1), and output connection terminals (6) for transmitting battery signals collected from the battery cells (1) to the outside, each of the battery cells (1) being electrically connected to at least one conductive busbar metal sheet (3), characterized in that it also comprises a stacked lower base film (8), an upper base film (9), and a plurality of sensor chips (5) for sensing the state of the battery cells (1), and a plurality of signal transmission wires (2) are laid on the surface of the lower base film (8) facing the upper base film (9); One end of each of the signal transmission wires (2) is electrically connected to the output connection terminal (6), and the other end of the signal transmission wire (2) extends to the bottom of any conductive bus metal sheet (3) or sensor chip (5) and forms a coil area (13) by spiral routing. The coil area (13) is connected to the conductive bus metal sheet (3) or sensor chip (5) located directly above it by soldering. Each of the conductive bus metal sheet (3) and sensor chip (5) is electrically connected to at least one signal transmission wire (2), and each of the signal transmission wires (2) is laid in a wave shape between the upper base film (9) and the lower base film (8).

2. The battery module according to claim 1, characterized in that: The signal transmission wire (2) is laid in a sinusoidal wave shape.

3. The battery module according to claim 1, characterized in that: The coil area (13) is a circular coil area or a rectangular coil area.

4. The battery module according to claim 1, characterized in that: The signal transmission wire (2) further comprises a metal wire (21) and an insulating layer (22) coated on the outside of the metal wire (21).

5. The battery module according to claim 4, characterized in that: The metal wire (21) is a round copper wire.

6. The battery module according to claim 1, characterized in that: A positioning hole (7) is provided at each of the four corners of the lower base film (8) and the upper base film (9), and positioning columns (14) cooperating with the positioning holes (7) are provided on the battery cells (1) arranged at the two ends.

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