Battery cell sampling assembly and battery pack

Abstract

The utility model discloses a battery cell sampling assembly and a battery pack, the battery cell sampling assembly comprises a plurality of battery monomers, a plurality of battery cells and a plurality of battery cells, the plurality of battery monomers are arranged in a stacking manner; the bus-bar assembly comprises a bus-bar support and a bus-bar body, the bus-bar support extends along the stacking direction of the battery cells, and the bus-bar body is arranged on the bus-bar support; the flexible circuit board is arranged between the busbar bracket and the battery monomers; and the connecting cantilever is connected between the busbar body and the flexible circuit board. According to the battery cell sampling assembly disclosed by the utility model, the connection cantilever is integrated with the flexible circuit board, so that the welding quantity of nickel sheets is reduced, the development work is reduced, raw materials are greatly saved, the utilization rate of the raw materials is improved, the environmental pollution is reduced, and the overall stability and reliability are improved through the connection cantilever.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a cell sampling assembly and a battery pack. Background Technology

[0002] Related technologies indicate that flexible printed circuit boards (FPCs) are lightweight, thin, flexible, and easy to bend, making them particularly suitable for products with limited space where a single rigid PCB cannot meet all design requirements. Currently, they are widely used in the automotive power battery field, not only improving the space utilization and energy density of battery packs, but also reducing failure rates under damp heat cycling and vibration conditions compared to aluminum wire bonding and PCB methods. Most cell temperature sensing sampling uses integrated nickel sheets, indirectly representing the actual cell temperature by collecting bus temperature data. However, when different numbers of cells are grouped together, due to differences in cell width, cell gap, cell length, and temperature sampling points, different modules often require a complete redesign of the FPC, significantly increasing development costs. With the need to reduce costs and improve raw material utilization, modular design of module sampling grouping technology is urgently needed.

[0003] When different numbers of battery cells are assembled into a module, due to differences in cell width, cell spacing, cell length, and temperature sampling points, different modules often require a complete redesign of the FPC (Flexible Printed Circuit), significantly increasing development costs. Furthermore, the FPC process employs etching, requiring substantial resources for waste liquid treatment and posing a risk of environmental pollution. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery cell sampling assembly, which has a stable structure and can reduce environmental pollution.

[0005] This utility model also proposes a battery pack having the above-mentioned cell sampling assembly.

[0006] According to a first aspect of the present invention, a battery cell sampling assembly includes: a plurality of battery cells stacked together; a bus assembly including a bus support and a bus body, the bus support extending along the stacking direction of the battery cells and the bus body disposed on the bus support; a flexible circuit board disposed between the bus support and the battery cells; and a connecting cantilever connecting the bus body and the flexible circuit board.

[0007] According to the present invention, the battery cell sampling assembly integrates a connecting cantilever with a flexible circuit board, which reduces the number of nickel sheet welds, reduces development work, greatly saves raw materials, improves the utilization rate of raw materials, reduces environmental pollution, and the connecting cantilever improves the overall stability and reliability.

[0008] In some embodiments, a buffer portion and a first weld portion are formed on the connecting cantilever. The first weld portion is formed at both ends of the connecting cantilever, and the buffer portion is formed between the two first weld portions. The bus body and the flexible circuit board are all connected to the connecting cantilever through the first weld portion.

[0009] In some embodiments, a disconnectable connection hole is formed on the buffer portion, and the width of the first weld portion welded to the flexible circuit board is the same as the width of the flexible circuit board.

[0010] In some embodiments, the connecting cantilever includes a PI film layer and a copper foil layer, wherein there are two PI film layers, the copper foil layer is disposed between the two PI film layers, and the two PI film layers are thermally pressed together.

[0011] In some embodiments, the cell sampling assembly further includes a temperature sensing module disposed on the bus body. The temperature sensing module includes a heat-conducting element and a module housing. The heat-conducting element is disposed between the module housing and the battery cell. An opening is formed on the module housing, and the heat-conducting element is arranged opposite to the opening.

[0012] In some embodiments, the module housing has a circumferentially formed protrusion, which is formed in two layers in the thickness direction of the module housing, and a slot is defined between the two layers of protrusion, the width of which is less than the thickness of the busbar body.

[0013] In some embodiments, the temperature sensing module has a second welding portion, and the temperature sensing module is connected to the flexible circuit board through the second welding portion.

[0014] In some embodiments, the cell sampling assembly further includes a connector assembly, the connector assembly including a first connector and a second connector, the first connector and the second connector being connected in a mating manner, the first connector being fixed on a fixing plate, a groove being formed on one of the fixing plate and the first connector, and a protrusion being formed on the other of the fixing plate and the first connector, the fixing plate and the first connector being connected through the protrusion and the groove.

[0015] In some embodiments, a limiting groove is formed on the fixing plate, and a limiting block is formed on the first connector. The first connector and the fixing plate are limited by the limiting groove and the limiting block. Guide surfaces are formed on both the limiting groove and the limiting block.

[0016] The battery pack according to the second aspect of the present invention includes a cell sampling assembly according to the first aspect of the present invention.

[0017] According to the battery pack of this utility model, by setting up the cell sampling assembly of the first aspect mentioned above, development work is reduced, raw materials are greatly saved, the utilization rate of raw materials is improved, production costs are reduced, and environmental pollution is reduced.

[0018] Additional aspects and advantages of this 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. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a battery cell sampling assembly according to an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 A partially enlarged schematic diagram of the battery cell sampling assembly shown;

[0021] Figure 3 yes Figure 1 A partially enlarged schematic diagram of the battery cell sampling assembly shown from another perspective;

[0022] Figure 4 yes Figure 1 A partially enlarged schematic diagram of the battery cell sampling assembly shown from another perspective;

[0023] Figure 5 yes Figure 1 A schematic diagram of another perspective of the battery cell sampling assembly shown;

[0024] Figure 6 yes Figure 5 The diagram shows a partially enlarged assembly schematic of the battery cell sampling assembly.

[0025] Figure label:

[0026] 1. Busbar assembly; 11. Busbar body; 2. Flexible circuit board; 3. Connecting cantilever; 31. Buffer part; 311. Connecting hole; 32. First welding part; 4. Temperature sensing module; 41. Heat-conducting component; 42. Module shell; 421. Protrusion; 43. Second welding part; 5. Connector assembly; 51. First connector; 511. Groove; 512. Limiting block; 52. Second connector; 6. Fixing plate; 61. Protrusion; 62. Limiting groove; 63. Guide surface. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] The following is for reference. Figures 1-6 A cell sampling assembly according to a first aspect embodiment of the present invention is described.

[0029] like Figures 1-6 As shown, the battery cell sampling assembly according to the first aspect of the present invention includes: multiple battery cells, a bus assembly 1, a flexible circuit board 2, and a connecting cantilever 3.

[0030] Specifically, multiple battery cells are stacked and arranged. The busbar assembly 1 includes a busbar bracket and a busbar body 11. The busbar bracket extends along the stacking direction of the battery cells. The busbar body 11 is disposed on the busbar bracket. The flexible circuit board 2 is disposed between the busbar bracket and the battery cells. The connecting cantilever 3 is connected between the busbar body 11 and the flexible circuit board 2.

[0031] According to the embodiment of the present invention, the battery cell sampling assembly is integrated with the flexible circuit board 2 by connecting the cantilever 3, which reduces the number of nickel sheets to be welded, reduces development work, greatly saves raw materials, improves the utilization rate of raw materials, reduces environmental pollution, and the connecting cantilever 3 improves the overall stability and reliability.

[0032] In some embodiments of this utility model, such as Figure 3 As shown, a buffer portion 31 and a first welding portion 32 are formed on the connecting cantilever 3. The first welding portion 32 is formed at both ends of the connecting cantilever 3, and the buffer portion 31 is formed between the two first welding portions 32. The busbar body 11 and the flexible circuit board 2 are all connected to the connecting cantilever 3 through the first welding portions 32. It can be understood that the buffer portion 31 absorbs the stress caused by the expansion or contraction of the material due to temperature changes, thereby reducing the failure rate. The first welding portion 32 is connected to the busbar body 11 and the flexible circuit board 2 by welding, which can ensure good connection strength.

[0033] Optionally, the welding method can be laser welding, ultrasonic welding, etc. Preferably, the welding method is ultrasonic welding.

[0034] In some embodiments of this utility model, such as Figures 1-3 As shown, a disconnectable connection hole 311 is formed on the buffer portion 31. In extreme cases, stress can be released by disconnecting one side of the connection hole 311, thereby playing a protective role. The width of the first welding portion 32, which is welded to the flexible circuit board 2, is the same as the width of the flexible circuit board 2, ensuring a stable connection between the first connection portion and the flexible circuit board 2.

[0035] In some embodiments of this utility model, the connecting cantilever 3 includes a PI film layer and a copper foil layer. Two PI film layers are included, and the copper foil layer is disposed between the two PI film layers. The two PI film layers are thermo-pressed together. It is understood that in the connecting cantilever 3, the PI film mainly provides mechanical support and protection, resisting the influence of the external environment (such as temperature changes, chemical corrosion, etc.) and providing physical protection for the internal copper foil layer. The copper foil layer is mainly used to realize current transmission, ensuring a reliable electrical connection between the busbar body 11 and the flexible circuit board 2. The copper foil also helps dissipate heat, improving the thermal management efficiency of the entire system. The thermo-pressing technology can form a strong and uniform interface, ensuring a tight bond between the PI film and the copper foil, thereby improving the stability and reliability of the overall structure.

[0036] In some embodiments of this utility model, such as Figures 1-6 As shown, the battery cell sampling assembly also includes a temperature sensing module 4, which is mounted on the busbar body 11. The temperature sensing module 4 includes a heat-conducting element 41 and a module housing 42. The heat-conducting element 41 is located between the module housing 42 and the battery cell. An opening is formed on the module housing 42, and the heat-conducting element 41 is arranged opposite to the opening. This allows for real-time monitoring of the battery cell's operating temperature, ensuring the safety and performance of the battery cell sampling assembly. The opening is used to observe whether the heat-conducting element 41 is deformed due to compression.

[0037] Preferably, the heat-conducting component 41 is made of silicone.

[0038] In some embodiments of this utility model, such as Figure 6 As shown, the module housing 42 has circumferentially formed protrusions 421. These protrusions 421 are formed in two layers along the thickness of the module housing 42, and a slot is defined between the two layers of protrusions 421. The width of the slot is less than the thickness of the busbar body 11. It can be understood that the temperature sensing module 4 and the busbar body 11 have an interference fit, ensuring a reliable connection without the need for fasteners. This makes the entire structure simpler and more compact, reducing production costs.

[0039] Furthermore, the temperature sensing module 4 has a second welding portion 43, through which the temperature sensing module 4 is connected to the flexible circuit board 2. This ensures a reliable and stable electrical connection between the temperature sensing module 4 and the flexible circuit board 2, reducing contact problems caused by vibration or temperature changes.

[0040] Furthermore, the temperature sensing module 4 is formed with a fixing column, which is used to fix the temperature sensing module 4 stably and prevent it from falling off during assembly and transportation. The temperature sensing module 4 is also formed with reinforcing ribs, which improve the structural strength of the temperature sensing module 4.

[0041] In some embodiments of the present invention, Figure 6 As shown, the battery cell sampling assembly also includes a connector assembly 5, which includes a first connector 51 and a second connector 52. The first connector 51 and the second connector 52 are connected in a mating manner. The first connector 51 is fixed to a fixing plate 6. A groove 511 is formed on one of the fixing plate 6 and the first connector 51, and a protrusion 61 is formed on the other of the fixing plate 6 and the first connector 51. The fixing plate 6 and the first connector 51 are connected through the engagement of the protrusion 61 and the groove 511. It can be understood that the first connector 51 is fixed to the fixing plate 6 by the engagement of the groove 511 and the protrusion 61, which ensures the stable installation of the connector assembly 5 and facilitates assembly and disassembly. The specific shape of the groove 511 and the protrusion 61 can prevent incorrect installation, ensure correct alignment and connection, reduce the environmental pollution caused by the etching of the flexible circuit board 2, add a new connection method, and reduce the production cost of the battery cell sampling assembly.

[0042] Furthermore, a limiting groove 62 is formed on the fixing plate 6, and a limiting block 512 is formed on the first connector 51. The first connector 51 and the fixing plate 6 are limited by the limiting groove 62 and the limiting block 512. Guide surfaces 63 are formed on both the limiting groove 62 and the limiting block 512. Thus, the guide surfaces 63 help guide the limiting block 512 smoothly into the limiting groove 62 during installation, thereby simplifying the assembly process and improving alignment accuracy. The cooperation between the limiting groove 62 and the limiting block 512 ensures the stable position of the first connector 51 on the fixing plate 6 and prevents displacement caused by vibration or other external forces.

[0043] A battery pack according to a second aspect of the present invention includes a cell sampling assembly according to the first aspect of the present invention described above.

[0044] The battery pack according to the present invention reduces development work, greatly saves raw materials, improves the utilization rate of raw materials, reduces production costs, and reduces environmental pollution by setting up the cell sampling assembly of the first aspect embodiment.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell sampling assembly, characterized in that, include: Multiple battery cells, and the multiple battery cells are stacked together; A bus assembly, comprising a bus support and a bus body, wherein the bus support extends along the stacking direction of the battery cells and the bus body is disposed on the bus support; A flexible circuit board is disposed between the busbar support and the battery cell; A connecting cantilever connects the busbar body and the flexible circuit board.

2. The cell sampling assembly according to claim 1, characterized in that, The connecting cantilever has a buffer portion and a first welding portion formed on it. The first welding portion is formed at both ends of the connecting cantilever, and the buffer portion is formed between the two first welding portions. The busbar body and the flexible circuit board are all connected to the connecting cantilever through the first welding portion.

3. The cell sampling assembly according to claim 2, characterized in that, The buffer portion has a disconnectable connection hole on one side, and the width of the first welding portion welded to the flexible circuit board is the same as the width of the flexible circuit board.

4. The cell sampling assembly according to claim 3, characterized in that, The connecting cantilever includes a PI film layer and a copper foil layer. There are two PI film layers, and the copper foil layer is disposed between the two PI film layers. The two PI film layers are heat-pressed together.

5. The cell sampling assembly according to claim 1, characterized in that, Also includes: A temperature sensing module is disposed on the busbar body. The temperature sensing module includes a heat-conducting component and a module housing. The heat-conducting component is disposed between the module housing and the battery cell. An opening is formed on the module housing. The heat-conducting component is arranged opposite to the opening.

6. The cell sampling assembly according to claim 5, characterized in that, The module housing has a circumferential protrusion, which is formed in two layers in the thickness direction of the module housing, and a slot is defined between the two layers of protrusion. The width of the slot is less than the thickness of the busbar body.

7. The cell sampling assembly according to claim 5, characterized in that, The temperature sensing module has a second welding part, and the temperature sensing module is connected to the flexible circuit board through the second welding part.

8. The cell sampling assembly according to any one of claims 1-7, characterized in that, Also includes: A connector assembly, comprising a first connector and a second connector, wherein the first connector and the second connector are connected in a mating manner, the first connector is fixed to a fixing plate, a groove is formed on one of the fixing plate and the first connector, and a protrusion is formed on the other of the fixing plate and the first connector, wherein the fixing plate and the first connector are connected through the protrusion and the groove.

9. The cell sampling assembly according to claim 8, characterized in that, A limiting groove is formed on the fixing plate, and a limiting block is formed on the first connector. The first connector and the fixing plate are limited by the limiting groove and the limiting block. Guide surfaces are formed on both the limiting groove and the limiting block.

10. A battery pack, characterized in that, Includes the cell sampling assembly according to any one of claims 1-9.

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