CCS assembly, battery module, battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, in particular to a CCS assembly, a battery module, a battery pack and a vehicle, the CCS assembly is applied to the battery module, the battery module comprises a plurality of battery cells, the CCS assembly comprises a bar, a flexible flat cable and a bonding lead, and the bar is connected with pole columns of adjacent battery cells in the battery module; the flexible flat cable is electrically connected with the chip through the bonding lead so as to collect parameters of the battery cell; the first end of the bonding wire is fixedly connected with the bar, and the second end of the bonding wire is fixedly connected with the flexible flat cable. The structure is simple, the production cost can be reduced, and the battery economy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a CCS assembly, battery module, battery pack and vehicle. BACKGROUND

[0002] The new energy electric vehicle field develops rapidly, and the industry is also looking for a design and manufacturing scheme with lower cost. The CCS (Cell Cluster Strap) is a key component of the power battery panel, and plays an extremely important role in maintaining the reliability and safety of electric vehicles. The CCS plays a role of high-voltage connection and low-voltage collection in the entire battery pack. It transmits the voltage and temperature information in the battery to the control integrated system, and monitors the safety of the electric vehicle during use at all times.

[0003] In the related art, the battery module is composed of a plurality of battery cells connected in series and parallel, and the voltage and temperature of the battery cells in the module are collected by welding a nickel sheet integrated with an FPC (Flexible Printed Circuit) to a bar sheet welded to the pole of the battery cell. However, the FPC has a complex process and therefore has a high cost, and the high cost of the FPC often increases the cost of the entire module or battery pack. SUMMARY

[0004] The utility model aims to provide a CCS assembly, battery module, battery pack and vehicle, which has a simple structure, can reduce production cost, and improve battery economy.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] In a first aspect, the utility model provides a CCS assembly applied to a battery module, wherein the battery module includes a plurality of battery cells, the CCS assembly includes a bar sheet, a flexible flat cable, and a bonding lead, the bar sheet is connected to the pole of the adjacent battery cell in the battery module, the flexible flat cable is electrically connected to the bar sheet through the bonding lead to collect the parameters of the battery cell, the first end of the bonding lead is fixedly connected to the bar sheet, and the second end of the bonding lead is fixedly connected to the flexible flat cable.

[0007] Further, the utility model further includes an insulating plate, the insulating plate is provided with a mounting surface for fixing the flexible flat cable and a plurality of mounting grooves for fixing the bar sheet.

[0008] Further, the insulating plate is provided with an isolation protrusion at the position between the flexible flat cable and the bar sheet.

[0009] Further, the isolation protrusion is provided with a groove matched with the bonding lead.

[0010] Further, the flexible flat cable comprises a first insulating film, a sampling circuit and a second insulating film which are sequentially stacked, and the first insulating film is provided with a notch for leaking the sampling circuit.

[0011] Further, the sampling circuit comprises a plurality of signal collection lines corresponding to the gaskets, and the length of the signal collection lines is determined according to the size and distribution of the battery cells.

[0012] Further, the notch on the first insulating film corresponds to the position of the end of the signal collection line, the first end of the bonding lead is fixedly connected with the gasket, and the second end of the bonding lead is fixedly connected with the flexible flat cable.

[0013] In a second aspect, the utility model provides a kind of battery module, the battery module includes a plurality of battery cells and above-mentioned CCS assembly, and the pole of adjacent battery cell is connected with the gasket.

[0014] In a third aspect, the utility model provides a kind of battery pack, which includes the battery module described above.

[0015] In a fourth aspect, the utility model provides a kind of vehicle, which includes the battery pack described above.

[0016] The utility model has the following unexpected beneficial effects:

[0017] 1, the utility model adopts bonding lead to realize the electrical connection between flexible flat cable and gasket of different materials, can more efficiently realize CCS assembly integration, without specific plating treatment or transfer scheme.And it can be selected according to the use demand Any size of bonding lead, not limited by equipment, etc., the same procedure can simultaneously compatible voltage sampling line, fuse fuse, temperature sensor integration, reduce the production cost of CCS assembly, improve the battery economy.Simultaneously, the flexible flat cable connected by bonding lead can meet the use requirement while reserving repair point, when abnormal fuse ablation or line fracture occurs during transportation or use, the simplest scheme can be used to realize maintenance, reduce maintenance cost.

[0018] 2, the utility model adopts flexible flat cable to collect the parameter (voltage, temperature etc.) of battery cell, compared with traditional wire harness, flexible flat cable is thin in thickness, small in size, can select wire number and pitch arbitrarily, can realize more compact layout in limited battery module space, effectively improve space utilization rate, while traditional wire harness is usually relatively thick, and will occupy more space.And the structure of flexible flat cable is relatively simple, and material cost and manufacturing cost are lower, and because production efficiency is high, production cost can be further reduced, and cost advantage is more obvious in large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application.

[0020] Figure 1 An isometric view of the CCS assembly according to an embodiment of the present application is shown.

[0021] Figure 2 A top view of the CCS assembly according to an embodiment of the present application is shown.

[0022] In the figure, 1 - bar, 2 - flexible flat cable, 3 - bonding lead, 4 - insulating plate, 5 - mounting groove, 6 - isolation protrusion. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described below with reference to the drawings and preferred embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the present specification. The present application can also be implemented or applied in other different specific embodiments, and each detail in the present specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0024] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and the drawings only show the components related to the present application, not the number, shape and size of the components when actually implemented. The actual implementation of each component can be randomly changed in shape, number and proportion, and the component layout pattern can also be more complex.

[0025] In an embodiment, referring to Figure 1 and Figure 2 The present application provides a CCS assembly applied to a battery module, the battery module comprising a plurality of battery cells, the CCS assembly comprising a bar 1, a flexible flat cable 2 and a bonding lead 3, the bar 1 being connected with the pole of adjacent battery cells in the battery module; the flexible flat cable 2 being electrically connected with the bar 1 through the bonding lead 3 to collect the parameters of the battery cells; the first end of the bonding lead 3 being fixedly connected with the bar 1, and the second end of the bonding lead 3 being fixedly connected with the flexible flat cable 2.

[0026] The tab 1 is directly welded on the pole of the adjacent battery cell as a conductive connecting piece, bears the current convergence function (series / parallel), and plays a high-voltage connection role in the power battery.

[0027] The flexible flat cable 2 (FFC, Flexible Flat Cable) is connected with the tab 1 through the bonding lead 3, is used for transmitting the voltage, temperature and other parameter signals of the battery cell, and realizes the voltage and temperature acquisition function of the battery module. The flexible design is suitable for the compact layout of the battery module and reduces the damage of mechanical stress to the line.

[0028] The utility model discloses a flexible flat cable 2 is used for collecting the parameter (voltage, temperature and the like) of battery cell, compared with the traditional wire harness, the flexible flat cable 2 is thin in thickness, small in size, can select the number of conductors and spacing arbitrarily, can realize more compact layout in the limited battery module space, effectively improves the space utilization rate. And the traditional wire harness is usually relatively thick, and a lot of space is occupied. And the flexible flat cable 2 structure is relatively simple, and the material cost and manufacturing cost are lower, and because production efficiency is high, production cost can be further reduced, and in large-scale production, the cost advantage is more obvious.

[0029] The bonding lead 3 is used as an intermediate connecting medium, is fixed to the tab 1 at the first end, and is connected with the flexible flat cable 2 at the second end. The bonding lead 3 is a metal wire or a metal strip, which is welded and fixed by hot pressing or ultrasonic welding. The welding method is simple and clean, does not need a complex process flow, can effectively improve the production efficiency, and also provides operability for the repair of the line break of the flexible flat cable 2.

[0030] The welding equipment for manufacturing the bonding lead 3 directly sets the welding point position, the welding line size, the line arc height and the welding force through programming, which greatly increases the compatibility. After welding, the welding point condition can be directly checked through image capture, and the welding reliability and consistency are also greatly increased.

[0031] The bonding lead 3 is independent of the tab 1 and the flexible flat cable 2, and is relatively simple to operate, which is convenient for fault positioning and maintenance, and is suitable for large-scale battery pack applications. For example, when the flexible flat cable 2 has problems such as fuse burnout and line breakage, the bonding lead 3 can be removed locally, and re-welded in the weldable area, and then glued to fix, so that the line repair of the CCS assembly can be realized. The scheme has strong operability in the manufacturing end and the after-sales end, and does not need a complex process program.

[0032] The utility model discloses a keying wire 3 is adopted to realize the electric connection between the flexible flat cable 2 and the tab 1 of different materials, can realize the CCS assembly integration more efficiently, need not special plating treatment or transfer scheme.

[0033] As a preferred embodiment of the utility model, referring to Figure 1 and Figure 2 The CCS assembly provided by the utility model further comprises an insulating plate 4, the insulating plate 4 is provided with a mounting surface for fixing the flexible flat cable 2 and a plurality of mounting grooves 5 for fixing the tab 1.

[0034] By providing the mounting surface on the insulating plate 4, the flexible flat cable 2 is supported and fixed by the mounting surface, which avoids the displacement of the flexible flat cable 2 due to vibration or thermal expansion and contraction, and prevents the short circuit risk caused by the direct contact between the flexible flat cable 2 and the metal parts (such as the tab 1 or the battery cell shell).

[0035] The tab 1 is accurately positioned by the mounting groove 5, which ensures that the connection position of the tab 1 and the battery cell pole is aligned, and reduces the manual assembly error.

[0036] The material (such as PC, PA66 or PBT engineering plastic) of the insulating plate 4 needs to have high temperature resistance (> 120 DEG C) to prevent deformation or insulation failure caused by abnormal heating of the battery cell.

[0037] The insulating plate 4 can also be designed as a standardized unit (such as corresponding to 4-6 battery cells per plate), and large-scale module rapid assembly can be realized by clamping or bolt splicing, which adapts to different battery cell quantity requirements.

[0038] Specifically, referring to Figure 1As shown, the insulating plate 4 is provided with a plurality of mounting grooves 5 in the first direction. The busbar 1 is arranged in the first direction, and the plurality of busbars 1 are arranged in one-to-one correspondence with the plurality of mounting grooves 5, and the mounting grooves are suitable for limiting the busbar 1. Specifically, the plurality of mounting grooves 5 are arranged in the first direction, and the busbar 1 can be at least partially embedded in the mounting groove 5 on the insulating plate 4, so that the mounting groove 5 can limit the busbar 1.

[0039] The flexible flat cable 2 extends in the first direction, and the flexible flat cable 2 is arranged between two adjacent rows of busbar groups in the second direction, and the first direction and the second direction are perpendicular.

[0040] Further, referring to Figure 1 As shown, the insulating plate 4 is provided with a plurality of mounting grooves 5 in the first direction. The busbar 1 is arranged in the first direction, and the plurality of busbars 1 are arranged in one-to-one correspondence with the plurality of mounting grooves 5, and the mounting grooves are suitable for limiting the busbar 1. Specifically, the plurality of mounting grooves 5 are arranged in the first direction, and the busbar 1 can be at least partially embedded in the mounting groove 5 on the insulating plate 4, so that the mounting groove 5 can limit the busbar 1.

[0041] The isolation protrusion 6 is located between the flexible flat cable 2 and the busbar 1, and forms an air insulation barrier through a physical height difference (such as 0.5-1.0mm), so as to avoid short circuit caused by contact between the flexible flat cable 2 and the busbar 1 due to accidental bending or vibration offset of the flexible flat cable 2. Especially suitable for high-voltage platform (such as 800V battery system) scene, can tolerate higher potential difference. And the isolation protrusion 6 structure can absorb the expansion stress of the battery module during charging and discharging, prevent the direct friction between the flexible flat cable 2 and the busbar 1 from causing wear (such as copper foil scratch). If an elastic material (such as silica gel coating) is used, it can also buffer vibration impact and prolong the connection life.

[0042] Further, the isolation protrusion 6 is provided with a groove matched with the bonding lead 3. The groove serves as a "guide rail" to guide the lead during ultrasonic welding or hot-press bonding, reducing manual alignment errors. After the bonding lead 3 is welded, according to the use scene and performance requirement, local glue is applied to strengthen the reliability of the welding point. The glue seals the bonding lead 3 in the groove of the isolation protrusion 6, further realizing the function of supporting the bonding lead 3.

[0043] As a preferred embodiment of the utility model, the flexible flat cable 2 comprises a first insulating film, a sampling circuit and a second insulating film arranged in sequence, and the first insulating film is provided with a notch for exposing the sampling circuit. The layered flexible cable design realizes the balance of high-reliability signal acquisition and compact space adaptation through precise notch positioning and multi-layer material cooperation,

[0044] The first insulating film plays a role of surface protection and mechanical support, and the sampling circuit is exposed by setting a notch on the first insulating film to realize electrical connection.

[0045] The sampling circuit can transmit cell voltage / temperature signals.

[0046] The second insulating film can play a role of insulating sealing at the bottom, preventing electrolyte from penetrating and environmental moisture from entering.

[0047] Further, the sampling circuit includes a plurality of signal acquisition lines corresponding to the tab 1, and the length of the signal acquisition line is determined according to the size and distribution of the battery cell. Figure 1 and Figure 2 As shown in the drawings, the signal acquisition line extends along the first direction, and the extension length is designed according to the distribution of the tab 1.

[0048] Further, the notch on the first insulating film corresponds to the position of the end of the signal acquisition line, the first end of the bonding lead 3 is fixedly connected with the tab 1, and the second end of the bonding lead 3 is fixedly connected with the flexible flat cable 2.

[0049] In an embodiment, the utility model further provides a battery module, the battery module includes a plurality of battery cells and the CCS assembly of any one of the above embodiments, and the pole of the adjacent battery cell is connected with the tab.

[0050] In an embodiment, the utility model further provides a battery pack, which includes the battery module of the above embodiment.

[0051] In an embodiment, the utility model provides a vehicle, which includes the battery pack of the above embodiment.

[0052] The above embodiments are only preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited thereto. Any equivalent replacement or transformation of the utility model based on the utility model is within the protection scope of the utility model.

Claims

1. A CCS assembly applied to a battery module, the battery module comprising a plurality of battery cells, characterized in that: The CCS assembly comprises a tab (1), a flexible flat cable (2) and a bonding lead (3), the tab (1) is connected with the pole of the adjacent battery cell in the battery module; the flexible flat cable (2) is electrically connected with the tab (1) through the bonding lead (3) to collect the parameters of the battery cell. The first end of the bonding lead (3) is fixedly connected with the tab (1), and the second end of the bonding lead (3) is fixedly connected with the flexible flat cable (2).

2. The CCS assembly of claim 1, wherein: Further comprising an insulating plate (4), the insulating plate (4) is provided with a mounting surface for fixing the flexible flat cable (2) and a plurality of mounting grooves (5) for fixing the tab (1) at intervals.

3. The CCS assembly of claim 2, wherein: The insulating plate (4) is provided with an isolation protrusion (6) at the position between the flexible flat cable (2) and the tab (1).

4. The CCS assembly of claim 3, wherein: The isolation protrusion (6) is provided with a groove matched with the bonding lead (3).

5. The CCS assembly of claim 1, wherein: The flexible flat cable (2) comprises a first insulating film, a sampling circuit and a second insulating film which are stacked in sequence, and the first insulating film is provided with a notch for leaking the sampling circuit.

6. The CCS assembly of claim 5, wherein: The sampling circuit comprises a plurality of signal collection lines corresponding to the tab (1), and the length of the signal collection line is determined according to the size and distribution of the battery cell.

7. The CCS assembly of claim 6, wherein: The notch on the first insulating film corresponds to the position of the end of the signal collection line, the first end of the bonding lead (3) is fixedly connected with the tab, and the second end of the bonding lead (3) is fixedly connected with the flexible flat cable (2).

8. A battery module comprising a plurality of cells, characterized by: Further comprising the CCS assembly according to any one of claims 1-7, the pole of the adjacent battery cell is connected with the tab (1).

9. A battery pack, characterized by: The battery module according to claim 8 is provided.

10. A vehicle characterized by: The battery pack according to claim 9 is provided.

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