A CCS assembly, battery pack and method with open-circuit detection

Abstract

The present invention relates to the technical field of batteries, and discloses a CCS assembly, a battery pack and a method with open-circuit detection, including a CCS module. The CCS module includes an FFC component and an aluminum bar busbar; the FFC component includes a first group of FFCs and a second group of FFCs connected in parallel; one ends of the first group of FFCs and the second group of FFCs are respectively provided with acquisition connectors for electrically connecting to the BMS sampling interface; the acquisition connector of the first group of FFCs and the acquisition connector of the second group of FFCs are alternatively electrically connected to the BMS sampling interface. By setting the FFC component of the CCS module into two groups to form two sampling circuits and alternatively electrically connecting them to the BMS sampling interface, when a certain sampling circuit fails, another sampling circuit can be started to continue sampling, reducing the scrap rate and improving the product utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a CCS assembly with open-circuit detection, a battery pack, and a method. Background Art

[0002] CCS (Cell Connection System), also known as a battery cover assembly, is used in electric vehicles (EVs) and hybrid electric vehicles (HEVs). As the upper cover of the battery module, it provides functions such as battery temperature sampling and cell voltage sampling, and realizes high-voltage series and parallel connections between cells. It provides temperature and voltage signals to the battery pack BMS through sampling lines or FPCs (flexible printed circuits) and connector assemblies. The FPC type sampling line can also provide a fuse function to reduce losses caused by excessive current. The BMS realizes the monitoring / control of the charging and discharging operation states of cells, modules, and battery packs through the CCS.

[0003] The existing CCS module solutions generally adopt the method of a wire harness isolation board plus FPC sampling. The problem with this sampling method is that once a short circuit occurs in the low-voltage sampling circuit and the FPC cannot be repaired, the entire module needs to be replaced. If the hot-press FPC solution is adopted, the same problem exists, that is, once faults such as open circuit or short circuit occur in the low-voltage sampling circuit, it cannot be repaired and the entire module needs to be replaced. The scrap rate is high. Summary of the Invention

[0004] The present invention provides a CCS assembly with open-circuit detection, a battery pack, and a method to solve the technical problem that the existing CCS assembly has a high scrap rate of modules or the entire battery pack due to sampling failure.

[0005] In a first aspect, a CCS assembly with open-circuit detection proposed by the present invention includes a plastic suction board and a CCS module disposed at the upper end of the plastic suction board. The CCS module includes a negative temperature coefficient thermistor, an FFC component, and an aluminum bar busbar. The FFC component includes a first group of FFCs and a second group of FFCs connected in parallel. Two groups of negative temperature coefficient thermistors and aluminum bar busbars are respectively provided. The first group of FFCs is electrically connected to a group of negative temperature coefficient thermistors and aluminum bar busbars to form a first sampling circuit. The second group of FFCs is electrically connected to the other group of negative temperature coefficient thermistors and aluminum bar busbars to form a second sampling circuit. One ends of the first group of FFCs and the second group of FFCs are respectively provided with acquisition connectors for electrically connecting to the BMS sampling interface. The acquisition connector of the first group of FFCs and the acquisition connector of the second group of FFCs are selectively electrically connected to the BMS sampling interface.

[0006] Further, each acquisition connector of the FFC component is electrically connected to the BMS sampling interface corresponding to the acquisition connector through multiple externally sampled lines connected in parallel, and a relay is arranged on each externally sampled line.

[0007] By arranging a relay on each externally sampled line, precise opening and closing control of the circuit is achieved, further improving the product utilization rate.

[0008] Further, the CCS module further includes a PPTC. Multiple internally sampled lines are respectively arranged on the first sampling circuit and the second sampling circuit, and the PPTC is welded on the internally sampled lines.

[0009] Utilizing the self - recovery characteristic of the PPTC can protect the first sampling circuit and the second sampling circuit, greatly reducing the scrap rate of the module or the whole pack caused by sampling failure.

[0010] Further, there are multiple CCS modules.

[0011] By setting multiple CCS modules, the sampling amount can be increased.

[0012] Further, the CCS assembly further includes a refrigeration module. The refrigeration module is arranged above the blister board, and the CCS module is arranged between the refrigeration module and the blister board.

[0013] Further, the refrigeration module includes a thermoelectric refrigeration plate, and the thermoelectric refrigeration plate is configured to clamp the CCS module with the blister board.

[0014] Further, a plurality of installation grooves are arranged at the upper end of the blister board, and the CCS module is arranged in the installation grooves.

[0015] Further, the thermoelectric refrigeration plate includes a plurality of refrigeration plate units connected end to end, and the refrigeration plate units are in an S shape; each refrigeration plate unit covers at least one of the aluminum bar busbars.

[0016] In a second aspect, the present invention provides a battery pack, including the CCS assembly with open - circuit detection according to any one of the above technical solutions.

[0017] In a third aspect, the present invention provides a sampling method for the CCS assembly with open - circuit detection, including:

[0018] First, assemble the CCS assembly with open - circuit detection as described above, electrically connect the acquisition connector of the first group of FFCs of the CCS assembly to the BMS sampling interface, and disconnect the electrical connection between the acquisition connector of the second group of FFCs and the BMS sampling interface;

[0019] When the first sampling circuit of the CCS assembly fails and cannot be repaired, disconnect the electrical connection between the acquisition connector of the first group of FFCs and the BMS sampling interface, and connect the acquisition connector of the second group of FFCs to the BMS sampling interface.

[0020] The beneficial effects brought by the technical solution provided by the present invention include: by setting the FFC components of the CCS module into two groups to form two sampling circuits, and alternatively connecting them to the BMS sampling interface, when a certain sampling circuit fails, another sampling circuit can be started to continue sampling, reducing the scrap rate and improving the product utilization rate. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is an exploded schematic view of the CCS assembly with wire break detection of the present invention.

[0023] Figure 2 For Figure 1 the structural schematic view after the thermoelectric cooling plate covers the aluminum bar busbar.

[0024] Figure 3 It is a schematic diagram of the electrical connection between the acquisition connectors of the first group of FFCs and the second group of FFCs of the CCS module A of the CCS assembly with wire break detection of the present invention and the BMS sampling interface.

[0025] Figure 4 It is a schematic diagram of the electrical connection between the acquisition connectors of the first group of FFCs and the second group of FFCs of the CCS module B of the CCS assembly with wire break detection of the present invention and the BMS sampling interface.

[0026] In the figure: 10 - negative temperature coefficient thermistor; 20 - aluminum bar busbar; 30 - FFC component; 31 - first group of FFCs; 32 - second group of FFCs; 40 - acquisition connector; 41 - external sampling line; 42 - internal sampling line; 43 - relay; 50 - refrigeration module; 51 - refrigeration plate unit; 511 - first horizontal section; 512 - second horizontal section; 513 - third horizontal section; 514 - first vertical section; 515 - second vertical section; 60 - blister board; 70 - BMS sampling interface. Detailed Embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0028] Existing CCS module solutions generally adopt the method of using a wire harness isolation board plus FPC sampling. The problem with this sampling method is that once a short circuit occurs in the low-voltage sampling circuit and the FPC cannot be repaired, the entire module needs to be replaced. If the hot-pressed FPC solution is adopted, the same problem exists with this sampling method, that is, once a fault such as a broken wire or short circuit occurs in the low-voltage sampling circuit, it cannot be repaired either, and the entire module needs to be replaced. Both of the above two sets of solutions have the problem of high scrap rate.

[0029] To solve the above problems, as Figures 1-4 shown, the present invention proposes a CCS assembly with open-circuit detection, including a plastic suction board 60 and a CCS module arranged at the upper end of the plastic suction board 60. The CCS module includes a negative temperature coefficient thermistor 10 (NTC), an FFC component 30, and an aluminum bar busbar 20; the FFC component 30 includes a first group of FFCs 31 and a second group of FFCs 32 connected in parallel; there are two sets of the negative temperature coefficient thermistor 10 and the aluminum bar busbar 20 respectively; the first group of FFCs 31 is electrically connected to a set of negative temperature coefficient thermistor 10 and aluminum bar busbar 20 to form a first sampling circuit; the second group of FFCs 32 is electrically connected to another set of negative temperature coefficient thermistor 10 and aluminum bar busbar 20 to form a second sampling circuit; one end of the first group of FFCs 31 and the second group of FFCs 32 are respectively provided with acquisition connectors 40 for electrically connecting to the BMS sampling interface 70; the acquisition connector 40 of the first group of FFCs 31 and the acquisition connector 40 of the second group of FFCs 32 are alternatively electrically connected to the BMS sampling interface 70.

[0030] Combined with Figure 3 、 4 shown, there are multiple CCS modules. In this embodiment, there are two FFC components 30. Of course, in other embodiments, there can be more FFC components 30. Thus, the sampling volume can be increased. In this embodiment, Figure 3 is CCS module A, Figure 4 is CCS module B. In fact, there can also be CCS module C, CCS module D, etc.

[0031] With attached Figure 3Taking the CCS module A as an example, the CCS module includes a first group of FFC31 and a second group of FFC32 connected in parallel, and two acquisition connectors 40. The two acquisition connectors 40 are the FFC-1-A port and the FFC-2-A port in Figure 3 the attached.

[0032] Each acquisition connector 40 of the FFC component 30 is electrically connected to the BMS sampling interface 70 corresponding to the acquisition connector 40 through multiple externally sampled lines 41 connected in parallel. A relay 43 is provided on each externally sampled line 41.

[0033] Continuing to take the attached Figure 3 as an example, the FFC-1-A port is electrically connected to the BMS sampling interface 70 through multiple externally sampled lines 41 connected in parallel. A relay 43 is provided on each of these externally sampled lines 41, that is, Relay-1A-1 to Relay-1A-n shown in Figure 3 the attached. Similarly, the FFC-2-A port is electrically connected to the BMS sampling interface 70 through multiple externally sampled lines 41 connected in parallel. A relay 43 is provided on each of these externally sampled lines 41, that is, Relay-2A-1 to Relay-2A-n shown in Figure 3 the attached.

[0034] During sampling, the relays 43 on Relay-1A-1 to Relay-1A-n are closed, and the relays 43 on Relay-2A-1 to Relay-2A-n are opened, so that the first sampling circuit of the first group of FFC31 is electrically connected to the BMS sampling interface 70. When a sampling failure occurs and the first sampling circuit cannot be repaired, the relays 43 on Relay-1A-1 to Relay-1A-n are opened, and the relays 43 on Relay-2A-1 to Relay-2A-n are closed, so that the second sampling circuit of the second group of FFC32 is electrically connected to the BMS sampling interface 70. Thus, sampling can continue without replacing the entire CCS assembly, reducing the scrap rate.

[0035] In addition, the CCS module further includes a PPTC. Multiple internal sampled lines 42 are respectively provided on the first sampling circuit and the second sampling circuit. The PPTC is welded on the internal sampled lines 42. Among them, taking the attached Figure 3For example, the inner sampling line 42 is the line to the left of the FFC-1-A port or the FFC-2-A port, while the outer sampling line 41 is the line to the right of the FFC-1-A port or the FFC-2-A port. The PPTC is not limited to the specific welding position on the inner sampling line 42 and can be flexibly set according to the actual space. It should be noted that the PPTC is a polymer positive temperature coefficient component, also known as a resettable fuse or a polymer fuse. In the electronics industry, it is commonly called a self-resetting fuse or an overcurrent protection chip. The main function of the self-resetting fuse is to provide overcurrent protection for the circuit. Different from the existing insurance scheme of the CCS assembly, the PPTC can be self-restored. When applied in the sampling system, it greatly reduces the scrap rate of the module or the whole package caused by sampling failure.

[0036] As Figure 4 shown, it is a partial example of the CCS module B, and this CCS module B is actually of the same structure as the attached Figure 3 CCS module A.

[0037] In some embodiments, the CCS module B and the CCS module A can be respectively connected to a BMS sampling interface 70, or can be connected to the same BMS sampling interface 70.

[0038] The CCS module B also includes two first groups of FFCs 31 and a second group of FFCs 32 connected in parallel, and two acquisition connectors 40. The two acquisition connectors 40 are the Figure 4 FFC-1-B port and the FFC-2-B port in the attachment.

[0039] The FFC-1-2 port is electrically connected to the BMS sampling interface 70 through multiple parallel outer sampling lines 41, and a relay 43 is provided on each of the outer sampling lines 41, that is, Relay-1B-1 to Relay-1B-n shown in the attachment Figure 4 . Similarly, the FFC-2-B port is electrically connected to the BMS sampling interface 70 through multiple parallel outer sampling lines 41, and a relay 43 is provided on each of the outer sampling lines 41, that is, Relay-2B-1 to Relay-2B-n shown in the attachment Figure 4 .

[0040] After the CCS assembly is completed, the BMS sampling interface 70 is connected to the FFC-1-A port and the FFC-1-B port, and the BMS controls all the relays 43. In some embodiments, if there is also a CCS module C, it is also connected to the FFC-1-C port.

[0041] Close Relay-1A-1~Relay-1A-n, Relay-1B-1~Relay-1B-n.

[0042] Disconnect Relay-2A-1 to Relay-2A-n, Relay-2B-1 to Relay-2B-n.

[0043] When a fault occurs and the sampling circuit cannot be repaired (PPTC fails), the BMS controls all relays 43:

[0044] Disconnect Relay-1A-1 to Relay-1A-n, Relay-1B-1 to Relay-1B-n.

[0045] Close Relay-2A-1 to Relay-2A-n, Relay-2B-1 to Relay-2B-n.

[0046] The CCS assembly further includes a refrigeration module 50, the refrigeration module 50 is disposed above the plastic suction board 60, and the CCS module is disposed between the refrigeration module 50 and the plastic suction board 60.

[0047] The refrigeration module 50 includes a thermoelectric refrigeration plate, and the thermoelectric refrigeration plate is configured to sandwich the CCS module with the plastic suction board 60.

[0048] The upper end of the plastic suction board 60 is provided with a plurality of mounting grooves, and the CCS module is disposed in the mounting grooves.

[0049] Combined with the attached Figure 1 、 2 As shown, the thermoelectric refrigeration plate includes a plurality of refrigeration plate units 51 connected end to end, and the refrigeration plate units 51 are in an S shape; each of the refrigeration plate units 51 covers at least one of the aluminum bar busbars 20.

[0050] In some embodiments, the electrothermal refrigeration plate includes two parallel refrigeration plate modules, and the two refrigeration plate modules are connected in series to form a whole electrothermal refrigeration plate. Each refrigeration plate module includes a plurality of refrigeration plate units 51 connected in series, the contour of the refrigeration plate unit 51 is in an S shape, and the refrigeration plate unit 51 includes a first horizontal section 511, a second horizontal section 512 and a third horizontal section 513 spaced along the length directions of the first group of FFC31 and the second group of FFC32, and further includes a first vertical section 514 and a second vertical section 515. The length directions of the first vertical section 514 and the second vertical section 515 are along the length directions of the first group of FFC31 and the second group of FFC32. The two ends of the first vertical section 514 are respectively connected to the first horizontal section 511 and the second horizontal section 512, and the two ends of the second vertical section 515 are respectively connected to the second horizontal section 512 and the third horizontal section 513. Among them, the two ends of the second horizontal section 512 are respectively connected to the first vertical section 514 and the second vertical section 515. At least the first vertical section 514 and the second vertical section 515 are used to cover the aluminum bar busbar 20.

[0051] Based on the same inventive concept, the present invention also provides a battery pack, which includes the CCS assembly with open-circuit detection in any of the above embodiments.

[0052] Based on the same inventive concept, the present invention also provides a sampling method for the CCS assembly with open-circuit detection, including:

[0053] First, assemble the CCS assembly with open-circuit detection, so that the acquisition connector 40 of the first group of FFC31 of the CCS assembly is electrically connected to the BMS sampling interface 70, and disconnect the electrical connection between the acquisition connector 40 of the second group of FFC32 and the BMS sampling interface 70;

[0054] When a fault occurs in the first sampling circuit of the CCS assembly and cannot be repaired, disconnect the electrical connection between the acquisition connector of the first group of FFC and the BMS sampling interface, and electrically connect the acquisition connector of the second group of FFC to the BMS sampling interface.

[0055] By setting the FFC components of the CCS module into two or more groups, two or more sampling circuits are formed, and one of them is electrically connected to the BMS sampling interface. When a certain sampling circuit fails, another sampling circuit can be activated to continue sampling, reducing the scrap rate and improving the product utilization rate.

[0056] It should be noted that in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0057] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sampling method for a CCS assembly with open - circuit detection, characterized in that: First, assemble the CCS assembly with open - circuit detection, electrically connect the acquisition connector of the first group of FFCs of the CCS assembly to the BMS sampling interface, and disconnect the electrical connection between the acquisition connector of the second group of FFCs and the BMS sampling interface; When the first sampling circuit of the CCS assembly fails and cannot be repaired, disconnect the electrical connection between the acquisition connector of the first group of FFCs and the BMS sampling interface, and electrically connect the acquisition connector of the second group of FFCs to the BMS sampling interface; Among them, the CCS assembly with open - circuit detection includes a plastic - blister board and a CCS module arranged at the upper end of the plastic - blister board. The CCS module includes a negative temperature coefficient thermistor, an FFC component, and an aluminum - bar busbar; the FFC component includes a first group of FFCs and a second group of FFCs connected in parallel; there are two groups of negative temperature coefficient thermistors and aluminum - bar busbars respectively; the first group of FFCs is electrically connected to a group of negative temperature coefficient thermistors and aluminum - bar busbars to form a first sampling circuit; the second group of FFCs is electrically connected to another group of negative temperature coefficient thermistors and aluminum - bar busbars to form a second sampling circuit; one end of each of the first group of FFCs and the second group of FFCs is also provided with an acquisition connector for electrically connecting to the BMS sampling interface; the acquisition connector of the first group of FFCs and the acquisition connector of the second group of FFCs are alternatively electrically connected to the BMS sampling interface.

2. The sampling method of the CCS assembly with open-circuit detection according to claim 1, characterized in that Each acquisition connector of the FFC component is electrically connected to the corresponding BMS sampling interface through multiple externally - sampled lines connected in parallel, and a relay is arranged on each externally - sampled line.

3. A sampling method for a CCS assembly with open-circuit detection as described in claim 1, characterized in that The CCS module further includes a PPTC. Multiple internally - sampled lines are respectively arranged on the first sampling circuit and the second sampling circuit, and the PPTC is welded on the internally - sampled lines.

4. The sampling method of the CCS assembly with open-circuit detection according to claim 1, characterized in that There are multiple CCS modules.

5. A sampling method for a CCS assembly with open - circuit detection as described in claim 1, characterized in that, The CCS assembly further includes a refrigeration module. The refrigeration module is arranged above the plastic - blister board, and the CCS module is arranged between the refrigeration module and the plastic - blister board.

6. The sampling method of the CCS assembly with open - circuit detection according to claim 5, characterized in that, The refrigeration module includes a thermoelectric refrigeration plate, and the thermoelectric refrigeration plate is configured to clamp the CCS module with the plastic - blister board.

7. A sampling method for a CCS assembly with open - circuit detection as described in claim 6, characterized in that, Multiple installation grooves are arranged at the upper end of the plastic - blister board, and the CCS module is arranged in the installation grooves.

8. The sampling method of the CCS assembly with open-circuit detection according to claim 6, wherein, The thermoelectric refrigeration plate includes multiple refrigeration - plate units connected end - to - end, and the refrigeration - plate units are in an S shape; each refrigeration - plate unit covers at least one of the aluminum - bar busbars.

9. A battery pack, characterized in that, It includes a CCS assembly with open - circuit detection that adopts the sampling method for a CCS assembly with open - circuit detection according to any one of claims 1 - 8.

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