Battery pack and electric equipment

Abstract

The embodiment of the utility model discloses a battery pack and electric equipment. The battery pack comprises a frame structure, a battery module and a flexible circuit board, the frame structure comprises at least two accommodating areas which are arranged at intervals in the first direction, and each accommodating area is internally provided with a battery module. And each battery module is integrated with a plurality of battery cell monomers. The flexible circuit board comprises a crossing part and connecting parts fixedly connected to the two ends of the crossing part in the first direction, the crossing part is arranged between every two adjacent containing areas in a crossing mode, the connecting parts are located in the different containing areas respectively, and the connecting parts are electrically connected with the battery cell monomers in the corresponding containing areas. According to the battery pack disclosed by the invention, the flexible circuit board adopts the crossing part to be directly and fixedly connected with the connecting part, so that the problem of unstable signal transmission caused by poor contact of the connecting parts of the battery modules in the two adjacent accommodating areas is avoided, and the electric connection reliability and the signal transmission stability of the battery pack are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially a kind of battery pack and electrical equipment. BACKGROUND

[0002] Battery pack is the core component in electrical equipment such as new energy vehicle, mainly used to store and release electric energy, to provide stable energy output for electrical equipment. Generally speaking, battery pack includes multiple battery modules, each battery module internally contains multiple battery cells, which are connected in series or parallel to meet the needs of different electric devices for voltage and capacity.

[0003] In electrical equipment such as new energy vehicles, battery pack not only affects the endurance of electrical equipment, but also directly determines the power performance and safety of electrical equipment. With the increasing demand of new energy vehicles and other electric devices for high energy density, high power output and long service life of battery pack, the electrical connection mode and overall reliability of battery pack have become an important research direction.

[0004] At present, the existing battery pack usually adopts flexible printed circuit board (FPC) to electrically connect the battery cells in the battery modules on both sides of support beam, to realize the transmission of voltage signal and temperature signal. However, in the prior art, flexible printed circuit board (FPC) is usually electrically connected to the battery modules on both sides of support beam by connector insertion to realize signal transmission, and the connector usually consists of male connector and female connector. In the long-term operation process, due to the influence of external factors such as vibration, thermal expansion and contraction, dust pollution, etc., the male connector and female connector may not be in good contact, which may cause unstable signal transmission or connection failure, affecting the normal work of battery pack. UTILITY MODEL CONTENTS

[0005] The embodiment of the utility model provides a kind of battery pack and electrical equipment to improve the electrical connection reliability of battery pack and the stability of signal transmission.

[0006] In order to solve the above technical problems, the embodiment of the utility model discloses the following technical scheme:

[0007] In the first aspect, a battery pack is provided, comprising:

[0008] Frame structure, comprising at least two accommodating areas arranged at intervals along the first direction;

[0009] Battery module, each accommodating area is provided with a battery module, and each battery module is integrated with a plurality of battery cells;

[0010] The flexible circuit board comprises a cross portion and connecting portions fixedly connected to two ends of the cross portion in a first direction, the cross portion is arranged across two adjacent accommodation areas, each connecting portion is located in a different accommodation area, and each connecting portion is electrically connected to a battery cell in the corresponding accommodation area.

[0011] Optionally, the frame structure comprises a first edge beam and a second edge beam arranged in the first direction, and a support beam between the first edge beam and the second edge beam, the first edge beam, the second edge beam and the support beam extend in the second direction, and the first direction and the second direction intersect;

[0012] In the first direction, the support beam divides the space between the first edge beam and the second edge beam into at least two accommodation areas.

[0013] Optionally, the cross portion crosses the support beam.

[0014] Optionally, in the first direction, the flat size of the cross portion is greater than the size of the support beam crossed by the cross portion.

[0015] Optionally, in the first direction, the battery cell close to the support beam in each battery module is a first connecting battery cell.

[0016] The battery pack further comprises a first electrical connector, the first electrical connector comprises a connector and first tabs connected to two ends of the connector in the first direction, and the first tabs of the same first electrical connector are respectively welded to the first connecting battery cells located on the two sides of the same support beam.

[0017] Optionally, the connector is in an arcuate structure.

[0018] Optionally, the battery modules arranged in the first direction and the flexible circuit boards electrically connected thereto jointly constitute a battery unit, the battery pack comprises a plurality of battery units, and the plurality of battery units are arranged in the second direction; in each battery unit, the battery module close to the first edge beam has a second connecting battery cell, and in the second direction, the second connecting battery cells of adjacent two battery units are oppositely arranged.

[0019] The battery pack further comprises a second electrical connector, the second electrical connector comprises two second tabs connected to each other, and in the second direction, the two second tabs of the same second electrical connector are respectively welded to the second connecting battery cells in the adjacent two battery units.

[0020] Optionally, in each battery unit, the connecting portion of the flexible circuit board close to the first edge beam is electrically connected to the second tab.

[0021] Optionally, the flexible circuit board is a bending part near the end of the second side beam, the bending part is lapped on the second side beam, and a signal connection terminal is arranged on the bending part, the signal connection terminal is used for establishing signal connection between the cell monomer electrically connected with the flexible circuit board and external equipment.

[0022] In a second aspect, a kind of power utilization equipment is provided, including any battery pack described above, and the battery pack is the power supply of power utilization equipment.

[0023] One of the above technical solutions has the following advantages or beneficial effects: in the circuit pack disclosed in the present application, the connection part of the flexible circuit board can be electrically connected with the cell monomer in the accommodation area it is in, to establish the signal transmission path of the cell monomer in a single battery module, and the connection parts in two adjacent accommodation areas are fixedly connected through the cross part, to establish the signal transmission path of the cell monomer in two adjacent battery modules. For the case that the connection parts of different accommodation areas are connected through the connector, the male end and the female end of the connector are prone to poor contact, which in turn causes unstable signal transmission or connection failure, affecting the normal work of the battery pack. Therefore, the cross part is directly fixedly connected with the connection part in the present application, avoiding the problem of electrical performance degradation caused by loose insertion or poor contact, and also avoiding the problem of unstable signal transmission of the battery module in the two adjacent accommodation areas caused by poor contact of the connection part, improving the electrical connection reliability and signal transmission stability of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0024] The technical scheme of the present application and other beneficial effects will be apparent from the detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings.

[0025] Figure 1 is a structural schematic diagram of a battery pack provided by an embodiment of the present application Figure One ;

[0026] Figure 2 is a structural schematic diagram of a battery unit provided by an embodiment of the present application

[0027] Figure 3 is a structural schematic diagram of a battery pack provided by an embodiment of the present application Figure Two .

[0028] BRIEF DESCRIPTION OF DRAWINGS

[0029] 10, frame structure; 11, first side beam; 12, second side beam; 13, support beam; 14, accommodation area

[0030] 20, battery module; 21, cell monomer; 22, first connection cell; 23, second connection cell

[0031] 30, flexible circuit board; 31, cross portion; 32, connecting portion; 33, bending portion; 331, signal connection terminal;

[0032] 40, first electrical connection; 41, connection; 42, first ear;

[0033] 50, second electrical connection; 51, second ear;

[0034] 60, battery cell. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described in the specification are only for the purpose of explaining the utility model, and are not intended to limit the utility model.

[0036] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0037] In the description of the utility model, it should be noted that, unless otherwise specifically specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0038] In the utility model, unless another definite provision and limitation, first feature is in second feature " on " or " under " can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but is in contact through other feature between them. Moreover, first feature is in second feature " on ", " above " and " on " include that first feature is in second feature directly above and obliquely above, or just indicate that first feature horizontal height is higher than second feature. First feature is in second feature " under ", " below " and " under " include that first feature is in second feature directly above and obliquely above, or just indicate that first feature horizontal height is less than second feature.

[0039] The utility model discloses a kind of battery pack, refer to Figure 1 And Figure 2 The battery pack includes: frame structure 10, battery module 20 and flexible circuit board 30. Frame structure 10 is used to accommodate multiple battery modules 20. Each battery module 20 is integrated with multiple battery monomers 21, and the flexible circuit board 30 is used to establish a signal transmission path between the battery monomers 21 in the same battery module 20 and between adjacent battery modules 20, and also used to establish a signal transmission path between the battery monomers 21 and external devices. The signal transmission path can be used to transmit at least the temperature signal and voltage signal of the battery monomers 21. Specifically, the frame structure 10 includes at least two accommodation areas 14 arranged at intervals along a first direction, and each accommodation area 14 is provided with a battery module 20. The flexible circuit board 30 includes a cross portion 31 and a connecting portion 32, and each end of the cross portion 31 in the first direction is fixedly connected to one connecting portion 32. The cross portion 31 is arranged between the two adjacent accommodation areas 14, and each connecting portion 32 is located in a different accommodation area 14, and each connecting portion 32 is electrically connected to the battery monomers 21 in the accommodation area 14.

[0040] The connecting portion 32 in the flexible circuit board 30 disclosed in the present application can be electrically connected to the battery monomers 21 in the accommodation area 14 where it is located, to establish a signal transmission path for the battery monomers 21 in a single battery module 20. The connecting portions 32 in the two adjacent accommodation areas 14 are fixedly connected by the cross portion 31, to establish a signal transmission path for the battery monomers 21 in the two adjacent battery modules 20. For the case where the connecting portions 32 of different accommodation areas 14 are connected by a connector, the male end and the female end of the connector are prone to poor contact, which further causes unstable signal transmission or connection failure, affecting the normal operation of the battery pack. Therefore, the present application directly fixes the cross portion 31 to the connecting portion 32, avoiding the problem of electrical performance degradation caused by loose insertion or poor contact, and further avoiding unstable signal transmission of the battery modules 20 in the two adjacent accommodation areas 14 due to poor contact of the connecting portion 32, improving the electrical connection reliability and signal transmission stability of the battery pack.

[0041] Preferably, in some embodiments, the frame structure 10 comprises a first side beam 11 and a second side beam 12 arranged in a first direction and a support beam 13 between the first side beam 11 and the second side beam 12. The first side beam 11, the second side beam 12 and the support beam 13 all extend in a second direction, and the first direction and the second direction intersect. In the first direction, the support beam 13 separates the space between the first side beam 11 and the second side beam 12 into at least two accommodation areas 14. Specifically, referring to Figure 1 In a preferred embodiment provided by the present application, in the first direction, there is one support beam 13 between the first side beam 11 and the second side beam 12, and the support beam 13 separates the space between the first side beam 11 and the second side beam 12 into two accommodation areas 14. It should be noted that in other embodiments, in the first direction, there can be two or more support beams 13 between the first side beam 11 and the second side beam 12, and the two or more support beams 13 are arranged in the first direction and separate the space between the first side beam 11 and the second side beam 12 into a plurality of accommodation areas 14, and the number of accommodation areas 14 is one more than the number of support beams 13.

[0042] In the embodiments disclosed in the present application, the spanning part 31 of the flexible circuit board 30 spans the support beam 13, and in the first direction, the flat size of the spanning part 31 is greater than the size of the support beam 13 it spans. In this way, when the battery module 20 on both sides of the support beam 13 is displaced or when the battery cell 21 is slightly displaced due to thermal expansion and contraction, the risk of tearing of the spanning part 31 is reduced, and the durability and environmental adaptability of the battery pack are improved. It should be noted that in some embodiments, the spanning part 31 and the connecting part 32 in the same flexible circuit board 30 are integrally formed.

[0043] Referring to Figure 1 and Figure 2 In a preferred embodiment provided by the present application, the end of the flexible circuit board 30 close to the second side beam 12 is a bent part 33, the bent part 33 overlaps the second side beam 12, and a signal connection terminal 331 is arranged on the bent part 33, and the signal connection terminal 331 is used for transmitting signals between the battery cell 21 electrically connected to the flexible circuit board 30 and external equipment.

[0044] Further, in the preferred embodiments of the present application, in the first direction, the battery cells 21 in the battery modules 20 located in different accommodation regions 14 and arranged oppositely are electrically connected with the same flexible circuit board 30. Specifically, the connecting portions 32 in the flexible circuit board 30 all extend along the first direction, and the connecting portions 32 on the two sides of the transverse portion 31 are arranged oppositely. In this way, the battery modules 20 arranged at intervals in the first direction and the flexible circuit boards 30 electrically connected therewith jointly constitute a battery unit 60 of the battery pack. In some embodiments, the battery pack includes a plurality of battery units 60, and the plurality of battery units 60 are arranged in sequence along the second direction.

[0045] With reference to Figure 1 and Figure 3 , the battery modules 20 in the same battery unit 60 need to be electrically connected to realize series connection or parallel connection of the battery cells 21 in the battery unit 60. In the embodiments disclosed in the present application, the battery modules 20 in the same battery unit 60 are electrically connected through the first electrical connecting member 40. Specifically, the battery cell 21 in each battery module 20 close to the support beam 13 in the first direction is a first connecting battery cell 22, the first electrical connecting member 40 includes a connecting member 41 and first lugs 42 connected to both ends of the connecting member 41 in the first direction, and the two first lugs 42 of the same first electrical connecting member 40 are respectively welded with two first connecting battery cells 22 located on the same support beam 13 and arranged oppositely. Compared with the electrical connection mode in which two electrical connecting sheets are respectively overlapped on two first connecting battery cells 22 arranged oppositely and the two electrical connecting sheets are fixed on the support beam 13 by overlapping and being fixed through bolts in some embodiments, the electrical connection mode disclosed in the present application not only avoids the problem of increased contact resistance between adjacent battery modules 20 and even electrical connection failure caused by bolt loosening, but also does not need to open holes on the support beam 13, thereby avoiding weakening the strength and rigidity of the support beam 13, and at the same time, reducing the use of auxiliary connecting parts and protective parts, thereby reducing the overall weight and cost of the battery pack.

[0046] It is worth mentioning that, with reference to Figure 3 , in the preferred embodiments disclosed in the present application, the connecting member 41 is in an arch structure. During the cyclic use of the battery pack, the battery cells 21 may expand, at this time, the first electrical connecting member 40 will be subjected to tensile force or extrusion force in the first direction, and the connecting member 41 is arranged in an arch structure, which can avoid affecting the electrical connection stability of the adjacent two battery modules 20 when the first connecting member 41 is subjected to tensile force or extrusion force. It should be noted that, in some embodiments, the connecting member 41 and the first lug 42 are integrally formed. The material of the first electrical connecting member 40 can be selected from aluminum, copper or copper-aluminum composite material.

[0047] With reference to Figure 1 and Figure 3The battery modules 20 in the battery units 60 adjacent in the second direction need to be electrically connected to connect the battery cells 21 in different battery units 60 in the battery pack in series or in parallel. In the embodiments disclosed in the present application, the battery modules 20 in the adjacent battery units 60 are electrically connected through the second electrical connectors 50. Specifically, the battery modules 20 in each battery unit 60 close to the first side beam 11 have second connecting battery cells 23, and the second connecting battery cells 23 of two adjacent battery units 60 are oppositely arranged in the second direction. The second electrical connectors 50 include two second lugs 51 connected to each other, and the two second lugs 51 of the same second electrical connector 50 are respectively welded to the second connecting battery cells 23 in the two adjacent battery units 60 in the second direction. Compared with the electrical connection mode in which two electrical connecting pieces are respectively overlapped on the two oppositely arranged second connecting battery cells 23, and the two ends of the bridging piece are respectively overlapped and fixed with the two electrical connecting pieces on the first side beam 11, the electrical connection mode disclosed in the present application not only avoids the problem of increased contact impedance between the adjacent battery units 60 due to bolt untwisting, and even the problem of electrical connection failure, but also does not need to open a hole in the first side beam 11, thereby avoiding the weakening of the strength and rigidity of the first side beam 11, and reducing the use of auxiliary connecting parts and protective parts, thereby reducing the overall weight and cost of the battery pack. It should be noted that in some embodiments, the two second lugs 51 of the same second electrical connector 50 are integrally formed. The material of the second electrical connector 50 can be aluminum, copper or copper-aluminum composite material.

[0048] It is worth mentioning that in some embodiments, in each battery unit 60, the connecting part 32 of the flexible circuit board 30 close to the first side beam 11 is electrically connected with the second lug 51. In this way, the second connecting battery cell 23 can receive or transmit signals through the connecting part 32.

[0049] The utility model embodiment further discloses a kind of electric equipment, including any battery pack described above, and battery pack is the power supply of electric equipment.In some embodiments, the electric equipment can be car and the like.

[0050] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of these technical features does not exist contradictory, it should be considered as the scope disclosed in the present application.

[0051] The above embodiments only express several implementation ways of the present application, and the description is specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery pack, characterized in that, include: The frame structure (10) includes at least two accommodating areas (14) spaced apart along a first direction; The battery module (20) is provided in each of the accommodating areas (14), and each of the battery modules (20) integrates multiple battery cells (21). The flexible circuit board (30) includes a span (31) and connecting portions (32) fixedly connected to both ends of the span (31) in a first direction. The span (31) spans between two adjacent accommodating areas (14). Each connecting portion (32) is located in a different accommodating area (14), and each connecting portion (32) is electrically connected to a battery cell (21) in its respective accommodating area (14).

2. The battery pack according to claim 1, characterized in that, The frame structure (10) includes a first side beam (11) and a second side beam (12) spaced apart along a first direction, and a support beam (13) located between the first side beam (11) and the second side beam (12). The first side beam (11), the second side beam (12) and the support beam (13) all extend along a second direction, and the first direction and the second direction intersect. In the first direction, the support beam (13) divides the space between the first side beam (11) and the second side beam (12) to form at least two accommodating areas (14).

3. The battery pack according to claim 2, characterized in that, The transverse span (31) crosses the support beam (13).

4. The battery pack according to claim 3, characterized in that, In the first direction, the flattened dimension of the span (31) is greater than the dimension of the support beam (13) it spans.

5. The battery pack according to claim 2, characterized in that, In the first direction, the cell unit (21) of each battery module (20) that is close to the support beam (13) is the first connecting cell (22); The battery pack further includes a first electrical connector (40), which includes a connector (41) and first lugs (42) connected to both ends of the connector (41) in a first direction. The first lugs (42) of the same first electrical connector (40) are welded one-to-one with the first connecting cells (22) located on both sides of the same support beam (13) and disposed opposite to each other.

6. The battery pack according to claim 5, characterized in that, The connector (41) has an arched structure.

7. The battery pack according to claim 2, characterized in that, The battery modules (20) arranged at intervals in the first direction and the flexible circuit board (30) electrically connected thereto together constitute a battery unit (60). The battery pack includes a plurality of battery units (60), which are arranged sequentially along the second direction. In each battery unit (60), the battery module (20) near the first side beam (11) has a second connecting cell (23). In the second direction, the second connecting cells (23) of two adjacent battery units (60) are arranged opposite to each other. The battery pack also includes a second electrical connector (50), which includes two connected second tabs (51). In the second direction, the two second tabs (51) of the same second electrical connector (50) are respectively welded to the second connecting cells (23) located in two adjacent battery cells (60).

8. The battery pack according to claim 7, characterized in that, In each of the battery cells (60), the flexible circuit board (30) is electrically connected to the second ear piece (51) near the connection part (32) of the first side beam (11).

9. The battery pack according to claim 2, characterized in that, The flexible circuit board (30) has a bent portion (33) at the end near the second side beam (12). The bent portion (33) overlaps the second side beam (12), and a signal connection terminal (331) is provided on the bent portion (33). The signal connection terminal (331) is used to enable the battery cell (21) electrically connected to the flexible circuit board (30) to establish a signal connection with an external device.

10. An electrical appliance, characterized in that, Includes a battery pack as described in any one of claims 1-9, wherein the battery pack is a power supply for the electrical device.

Images