Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment, the battery pack comprises a first shell, a battery cell assembly, a circuit board, a connecting terminal and a wire harness, the first shell is internally provided with a first space, the battery cell assembly is arranged in the first space, and the battery cell assembly comprises a battery cell. The circuit board comprises a substrate and an electronic element arranged on the substrate, and the battery cell is connected with the substrate. The connecting terminal comprises a welding part and a first connecting part, and the welding part is welded on the substrate; the wire harness comprises a connecting section, the connecting section is arranged on the first connecting part, and an acute angle is formed between the extending direction of the first connecting part and the substrate. In the battery pack, the welding part of the connecting terminal is connected with the substrate, the first connecting part is connected with the connecting section of the wire harness, an acute angle is formed between the extension direction of the first connecting part and the substrate, and an acute angle is also formed between the connecting section of the wire harness and the substrate, so that the bending radius of the wire harness is reduced, and the occupation of the wire harness on the internal space of the first shell is reduced; therefore, the size of the first shell is reduced, and the energy density of the battery pack is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of energy storage devices, and in particular, relates to a battery pack and electrical equipment. Background Art

[0002] At present, after the wiring harness of the battery pack is connected to the circuit board, it has a large bending radius, which occupies a large amount of the internal space of the battery pack, so that a large space needs to be reserved inside the battery pack to accommodate the wiring harness. This reserved space makes it difficult to reduce the overall volume of the battery pack, which is not conducive to improving the energy density of the battery pack. Utility Model Content

[0003] In view of the above situation, it is necessary to provide a battery pack that is conducive to reducing the bending radius of the wiring harness and improving the energy density of the battery pack.

[0004] The embodiment of the present application provides a battery pack, including a first shell, a battery cell assembly, a circuit board, a connection terminal and a wiring harness, wherein the first shell has a first space, the battery cell assembly is arranged in the first space, and the battery cell assembly includes a battery cell. The circuit board includes a substrate and an electronic component arranged on the substrate, and the battery cell is connected to the substrate. The connection terminal includes a welding portion and a first connection portion, and the welding portion is welded to the substrate; the wiring harness includes a connection section, and the connection section is arranged at the first connection section, and there is an acute angle between the extension direction of the first connection section and the substrate.

[0005] In this battery pack, the welding portion of the connecting terminal is connected to the substrate, and the first connecting portion is connected to the connecting section of the wiring harness. Since there is an acute angle between the extension direction of the first connecting portion and the substrate, there is also an acute angle between the connecting section of the wiring harness and the substrate, which is beneficial to reducing the bending radius of the wiring harness and reducing the occupation of the internal space of the first shell by the wiring harness, thereby helping to reduce the volume of the first shell and improve the energy density of the battery pack.

[0006] In one or more of the above optional embodiments, the first connecting portion is provided with a connecting hole, which passes through the first connecting portion along the extension direction of the first connecting portion, and the connecting section is provided in the connecting hole. This is beneficial to improving the assembly efficiency of the connecting section and the first connecting portion on the one hand, and is beneficial to improving the stability of the connection between the connecting section and the first connecting portion on the other hand.

[0007] In one or more of the above optional embodiments, the connection terminal includes a second connection portion, and the second connection portion connects the first connection portion and the welding portion. The connection terminal is formed by connecting three parts, has a simple structure, and is conducive to reducing production costs.

[0008] In one or more of the above optional embodiments, there is an obtuse angle between the welding portion and the second connecting portion, which is conducive to forming an acute angle between the first connecting portion and the substrate.

[0009] In one or more of the above optional embodiments, the first connection portion extends from the second connection portion, and the extension direction of the first connection portion is the same as the extension direction of the second connection portion, which is beneficial to the bending of the wire harness.

[0010] In one or more of the above optional embodiments, the welding portion is connected to the circuit board at an angle, which is beneficial to further reduce the bending radius of the wiring harness and reduce the occupation of the wiring harness in the first space, thereby further reducing the volume of the first shell and improving the energy density of the battery pack.

[0011] In one or more of the above optional embodiments, the battery pack includes a connector, the connector is configured to be connected to an electrical device, and the wiring harness is electrically connected to the connector, which is conducive to repeated connection and separation of the battery pack and the electrical device.

[0012] In one or more of the above optional embodiments, the substrate is provided with an opening penetrating the substrate, and the welding portion passes through the opening and is welded to the substrate, which is beneficial to reduce the possibility of the solder moving along the connecting terminal to the wiring harness during soldering, thereby facilitating the bending of the wiring harness.

[0013] In one or more of the above optional embodiments, the wiring harness is configured to transmit the electrical energy of the battery cell assembly so that the battery cell assembly can transmit electrical energy to other devices or receive electrical energy from other devices.

[0014] The embodiment of the present application also provides an electric device, including a battery pack as described in any of the above embodiments. The battery pack uses a connection terminal to connect the wiring harness, which is beneficial to reducing the volume of the first housing, and the electric device uses this battery pack, which is beneficial to miniaturization of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of a battery pack in one embodiment of the present application.

[0016] Figure 2 It is a schematic diagram of the structural decomposition of a battery pack in one embodiment of the present application.

[0017] Figure 3 It is a cross-sectional schematic diagram of a battery pack in one embodiment of the present application.

[0018] Figure 4 It is a schematic diagram of the partial structure of a battery pack in one embodiment of the present application.

[0019] Figure 5 It is a schematic diagram of the structure of a battery cell in one embodiment of the present application.

[0020] Figure 6 It is a schematic diagram of the structure of a substrate in an embodiment of the present application.

[0021] Figure 7It is a schematic diagram of the structure of the connecting terminal in one embodiment of the present application.

[0022] Figure 8 It is a schematic diagram of the structure of an electrical device in an embodiment of the present application.

[0023] Reference numerals

[0024] Battery Pack 100

[0025] First housing 10

[0026] First space 10a

[0027] Top wall 11

[0028] Bottom wall 12

[0029] First side wall 13

[0030] Second side wall 14

[0031] The third side wall 15

[0032] Fourth side wall 16

[0033] Battery cell assembly 20

[0034] Battery 21

[0035] Battery shell 211

[0036] Electrode terminal 212

[0037] Circuit board 30

[0038] Substrate 31

[0039] Opening 311

[0040] Electronic components 32

[0041] Connecting terminal 40

[0042] Welding part 41

[0043] The first paragraph 411

[0044] Second paragraph 412

[0045] First connection portion 42

[0046] Connection hole 421

[0047] Craft seam 422

[0048] Second connection portion 43

[0049] Harness 50

[0050] Connection section 51

[0051] Connector 60

[0052] The first angle α

[0053] The second angle β

[0054] First direction X

[0055] Second direction Y

[0056] The third direction Z

[0057] Electrical equipment 1000

[0058] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0060] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally arranged element at the same time. When an element is considered to be "set" on another element, it may be directly set on the other element or there may be a centrally arranged element at the same time. In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection, or it may be indirectly connected through an intermediate medium, or it may be internal communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0062] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0063] In the description of the embodiments of the present application, the term "perpendicular" is used to describe an ideal state between two components. In actual production or use, there may be a state that is approximately perpendicular between the two components. The two components described as "perpendicular" may not be absolutely straight lines or planes, but may be roughly straight lines or planes. From a macroscopic point of view, if the overall extension direction is a straight line or a plane, the components can be considered to be "straight lines" or "planes".

[0064] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. The various embodiments in the present application may be combined with each other in the absence of conflict.

[0065] An embodiment of the present application provides a battery pack, including a first shell, a battery cell assembly, a circuit board, a connecting terminal and a wiring harness. The first shell has a first space, the battery cell assembly is arranged in the first space, and the battery cell assembly includes a battery cell. The circuit board includes a substrate and an electronic component arranged on the substrate, and the battery cell is connected to the substrate. The connecting terminal includes a welding portion and a first connecting portion, and the welding portion is welded to the substrate. The wiring harness has a connecting section, and the connecting section is arranged at the first connecting portion. There is an acute angle between the extension direction of the first connecting portion and the substrate.

[0066] In the above-mentioned battery pack, the welding portion of the connecting terminal is connected to the substrate, and the first connecting portion is connected to the connecting section of the wiring harness. Since there is an acute angle between the extension direction of the first connecting portion and the substrate, there is also an acute angle between the connecting section of the wiring harness and the substrate, which is beneficial to reducing the bending radius of the wiring harness and reducing the occupation of the internal space of the first shell by the wiring harness, thereby helping to reduce the volume of the first shell and improve the energy density of the battery pack.

[0067] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0068] like Figures 1 to 3 As shown, an embodiment of the present application provides a battery pack 100, including a first shell 10 and a battery cell assembly 20, the first shell 10 is provided with a first space 10a, and the battery cell assembly 20 is arranged in the first space 10a.

[0069] In some embodiments, Figure 2 and Figure 4 As shown, the battery pack 100 includes a circuit board 30 , the circuit board 30 includes a substrate 31 and electronic components 32 disposed on the substrate 31 , and the battery cell assembly 20 is connected to the substrate 31 .

[0070] In some embodiments, Figure 2As shown, the first housing 10 includes a first side wall 13 and a second side wall 14 arranged along a first direction X, a top wall 11 and a bottom wall 12 arranged along a second direction Y, and a third side wall 15 and a fourth side wall 16 arranged along a third direction Z. The first side wall 13, the second side wall 14, the third side wall 15 and the fourth side wall 16 are connected between the top wall 11 and the bottom wall 12, and are enclosed and connected with the top wall 11 and the bottom wall 12 to form a first space 10a. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0071] In some embodiments, the bottom wall 12 is used to support the battery cell assembly 20 , and the circuit board 30 is disposed on a side of the battery cell assembly 20 facing the top wall 11 .

[0072] In some embodiments, Figure 2 As shown, the battery cell assembly 20 includes a battery cell 21 , and the battery cell 21 is connected to a substrate 31 .

[0073] In some embodiments, Figure 5 As shown, the battery cell 21 includes a battery cell shell 211, an electrode assembly (not shown) and an electrode terminal 212. The electrode assembly 20 is disposed in the battery cell shell 211. The electrode terminal 212 is connected to the electrode assembly and extends out of the battery cell shell 211. The electrode terminal 212 is connected to the substrate 31.

[0074] In some embodiments, the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet.

[0075] In some embodiments, the positive electrode sheet, the separator, and the negative electrode sheet are stacked and then wound to form a wound structure.

[0076] In some embodiments, a plurality of positive electrode sheets, a plurality of separators, and a plurality of negative electrode sheets are stacked to form a stacked structure.

[0077] In some embodiments, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector, and the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector.

[0078] In some embodiments, both the positive electrode current collector and the negative electrode current collector are metal layers. As an illustrative example, the positive electrode current collector may be a metal layer including at least one of aluminum, nickel, tantalum, and titanium, such as aluminum foil. The negative electrode current collector may be a metal layer including at least one of copper, nickel, tantalum, and titanium, such as copper foil.

[0079] In some embodiments, the positive electrode active material layer includes a positive electrode active material, and as an exemplary example, the positive electrode active material includes at least one of lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, lithium manganese iron phosphate, or lithium manganese oxide. The negative electrode active material layer includes a negative electrode active material, and as an exemplary example, the negative electrode active material includes at least one of graphite, hard carbon, soft carbon, silicon, silicon-oxygen material, and silicon-carbon material.

[0080] In some embodiments, the isolation film is an insulating film material such as a polyethylene film, a polypropylene film, a polyester film or a polyimide film to isolate the positive electrode sheet from the negative electrode sheet.

[0081] In some embodiments, a plurality of battery cells 21 are provided, and the plurality of battery cells 21 are all connected to the substrate 31 .

[0082] In some embodiments, at least two battery cells 21 are connected by double-sided tape to form a battery cell group. There are multiple battery cell groups, and foam is provided between two adjacent battery cell groups.

[0083] In some embodiments, Figure 2 and Figure 4 As shown, the battery pack 100 includes a connection terminal 40 and a wiring harness 50. The wiring harness 50 is connected to the substrate 31 through the connection terminal 40.

[0084] In some embodiments, the connection terminal 40 and the wiring harness 50 are disposed on a side of the circuit board 30 facing the top wall 11 .

[0085] In some embodiments, Figure 4 and Figure 6 As shown, the connection terminal 40 includes a welding portion 41 and a first connection portion 42, the welding portion 41 is welded to the substrate 31, and there is a first angle α between the extension direction of the first connection portion 42 and the substrate 31, and the first angle α is an acute angle. The wiring harness 50 includes a connecting section 51, and the connecting section 51 is arranged at the first connecting portion 42. The first angle α is an acute angle, and there is also an acute angle between the connecting section 51 of the wiring harness 50 and the substrate 31, which is conducive to reducing the bending radius of the wiring harness 50, reducing the occupation of the wiring harness 50 in the first space 10a, and helping to reduce the volume of the first shell 10, thereby facilitating the improvement of the energy density of the battery pack 100.

[0086] In some embodiments, the first angle α ranges from 10° to 40°.

[0087] In some embodiments, Figure 4 , Figure 6 and Figure 7 As shown, the circuit board 30 is provided with an opening 311 penetrating the substrate 31 , and the soldering portion 41 passes through the opening 311 and is soldered to the substrate 31 .

[0088] In some embodiments, the welding portion 41 is connected to the substrate 31 by soldering. The welding portion 41 passes through the opening and is welded to the substrate 31, which helps to reduce the possibility of the solder moving along the connecting terminal 40 to the wiring harness 50 during soldering, thereby facilitating the bending of the wiring harness 50.

[0089] In some embodiments, Figure 7 As shown, the welding portion 41 includes a first section 411 and a second section 412. The width of the first section 411 is adapted to the width of the opening 311 of the substrate 31, and the width of the second section 412 is greater than the width of the first section 411. When the welding portion 41 is connected to the substrate 31, the first section 411 is inserted into the opening 311, and the second section 412 is in contact with the substrate 31, so that the substrate 31 limits the welding portion 41, which is conducive to reducing the difficulty of welding the substrate 31 to the welding portion 41.

[0090] In some embodiments, the welding portion 41 is configured in a plate shape, which is beneficial to simplifying the structure of the welding portion 41. In some other embodiments, the welding portion 41 may also be configured in other shapes such as a columnar shape, a block shape, and a spherical shape, which are not specifically limited here.

[0091] In some embodiments, Figure 4 and Figure 7 As shown, the first connecting portion 42 is provided with a connecting hole 421. Along the extension direction of the first connecting portion 42, the connecting hole 421 penetrates the first connecting portion 42. The connecting section 51 is provided in the connecting hole 421. On the one hand, it is beneficial to improve the assembly efficiency of the connecting section 51 and the first connecting portion 42, and on the other hand, it is beneficial to improve the stability of the connection between the connecting section 51 and the first connecting portion 42.

[0092] In some embodiments, Figure 7 As shown, the first connecting portion 42 is formed by bending a plate-like material into an annular cylinder, a connecting hole 421 is formed in the middle of the cylinder, and a process seam 422 is left on the side of the cylinder. The existence of the process seam 422 makes the cylinder have a certain deformation ability, which is conducive to inserting the wire harness 50 into the connecting hole 421.

[0093] In some embodiments, the first connecting portion 42 has a receiving groove, and the connecting section 51 is received in the receiving groove.

[0094] In some embodiments, the first connection portion 42 is configured to be plate-shaped, and the wiring harness 50 is connected to the first connection portion 42 by welding or using conductive adhesive.

[0095] In some embodiments, Figure 7 As shown, the connection terminal 40 includes a second connection portion 43, and the second connection portion 43 connects the first connection portion 42 and the welding portion 41. The connection terminal 40 is formed by connecting three parts, and has a simple structure, which is conducive to reducing production costs.

[0096] In some embodiments, the first connection portion 42 , the second connection portion 43 and the welding portion 41 are formed in an integrally formed structure, which is beneficial for further reducing the production cost of the connection terminal 40 .

[0097] In some embodiments, Figure 7 As shown, there is a second angle β between the welding portion 41 and the second connecting portion 43, and the second angle β is an obtuse angle. After the welding portion 41 is connected to the substrate 31, it is beneficial to form an acute angle between the first connecting portion 42 and the substrate 31.

[0098] In some embodiments, the second angle β ranges from 100° to 120°.

[0099] In some embodiments, Figure 7 As shown, the first connection portion 42 extends from the second connection portion 43 , and the extending direction of the first connection portion 42 is the same as the extending direction of the second connection portion 43 , which is beneficial to the bending of the wire harness 50 .

[0100] In some embodiments, Figure 4 As shown, the welding portion 41 is connected to the circuit board 30 at an angle, which is beneficial to further reduce the bending radius of the wiring harness 50 and reduce the occupation of the wiring harness 50 in the first space 10a, thereby facilitating further reducing the volume of the first shell 10 and improving the energy density of the battery pack 100.

[0101] In some embodiments, the connection terminal 40 is made of copper, which is beneficial for improving the conductive performance of the connection terminal 40 due to the high conductivity of copper.

[0102] In some embodiments, Figure 4 As shown, there are a plurality of wire harnesses 50 , and a plurality of connection terminals 40 are provided corresponding to the number of wire harnesses 50 , and each wire harness 50 is connected to one connection terminal 40 .

[0103] In some embodiments, the wiring harness 50 is configured to transmit the power of the battery cell assembly 20 so that the battery cell assembly 20 can transmit power to other devices or receive power from other devices.

[0104] In some embodiments, the wiring harness 50 includes at least one wire configured to transmit electrical energy and / or electrical signal information, including but not limited to voltage, current, temperature, and resistance.

[0105] In some embodiments, Figure 2 As shown, the battery pack 100 includes a connector 60, which is configured to be connected to an electric device, so as to facilitate repeated connection and separation between the battery pack 100 and the electric device.

[0106] In some embodiments, the wiring harness 50 is electrically connected to the connector 60 .

[0107] like Figure 7 As shown, the embodiment of the present application further provides an electric device 1000, which includes the battery pack 100 involved in any of the above embodiments. The battery pack 100 uses a connection terminal 40 to connect the wiring harness 50, which is beneficial to reducing the volume of the first housing 10, and the electric device 1000 uses this battery pack 100, which is beneficial to the miniaturization of the electric device 1000.

[0108] In some embodiments, the electric device 1000 includes but is not limited to new energy vehicles, electric two-wheeled vehicles and drones.

[0109] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the disclosure scope of the present application.

Claims

1. A battery pack, characterized in that: include: A first shell, wherein the first shell has a first space therein; A battery cell assembly is disposed in the first space, wherein the battery cell assembly includes a battery cell; A circuit board, comprising a substrate and electronic components arranged on the substrate, wherein the battery cell is connected to the substrate; A connecting terminal, comprising a welding portion and a first connecting portion, wherein the welding portion is welded to the substrate; A wiring harness comprises a connecting section, wherein the connecting section is arranged at the first connecting portion, and an acute angle exists between an extending direction of the first connecting portion and the substrate.

2. The battery pack according to claim 1, characterized in that: The first connecting portion is provided with a connecting hole, and along the extending direction of the first connecting portion, the connecting hole penetrates the first connecting portion, and the connecting section is arranged in the connecting hole.

3. The battery pack according to claim 1, wherein: The connection terminal includes a second connection portion connecting the first connection portion and the welding portion.

4. The battery pack according to claim 3, characterized in that: An obtuse angle exists between the welding portion and the second connecting portion.

5. The battery pack according to claim 4, characterized in that: The first connection portion extends from the second connection portion, and an extending direction of the first connection portion is the same as an extending direction of the second connection portion.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The welding portion is connected to the circuit board obliquely.

7. The battery pack according to claim 6, characterized in that: The battery pack includes a connector configured to be connected to an electric device; The wiring harness is electrically connected to the connector.

8. The battery pack according to claim 6, wherein: The substrate is provided with an opening penetrating the substrate, and the welding portion passes through the opening and is welded to the substrate.

9. The battery pack according to claim 6, characterized in that: The wiring harness is configured to transmit electrical energy of the battery cell assembly.

10. An electrical device, characterized in that: Comprising a battery pack as claimed in any one of claims 1 to 9.

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