Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment. The battery pack comprises a battery cell, a circuit board and a battery management system, the circuit board is arranged on the battery cell and connected with the battery cell, and one end of the circuit board is provided with a first terminal; and the battery management system is arranged beside the battery cell and is provided with a second terminal, and the second terminal is directly inserted into the first terminal. The battery pack is used for achieving the effect of reducing the cost.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to a battery pack and electrical equipment. Background Technology

[0002] With the development of science and technology and the ever-increasing demand for energy, battery packs are being used more and more widely. A battery pack typically includes a housing, and inside the housing, battery cells, circuit boards, and a battery management system. The circuit boards connect the battery cells and the battery management system. However, battery packs are relatively expensive. Utility Model Content

[0003] This application provides a battery pack and electrical equipment to reduce the cost of the battery pack.

[0004] In a first aspect, embodiments of this application provide a battery pack, comprising:

[0005] Battery cell;

[0006] A circuit board is disposed on the battery cell and connected to the battery cell. One end of the circuit board has a first terminal.

[0007] A battery management system is disposed next to the battery cell, and the battery management system has a second terminal that is directly inserted into the first terminal.

[0008] In some possible implementations, the battery pack further includes:

[0009] A support layer is disposed between the battery cell and the circuit board, and the support layer is insulated.

[0010] In some possible implementations, the battery pack further includes:

[0011] A battery pack circuit breaker unit is disposed next to the battery cell. The battery pack circuit breaker unit includes a tray and at least two devices distributed within the tray.

[0012] In some possible implementations, the battery pack disconnect unit further includes:

[0013] Vibration-damping feet are located on the outside of the tray and connected to the tray.

[0014] In some possible implementations, the battery pack further includes:

[0015] The housing has a receiving cavity, in which the battery cell, the circuit board, and the battery management system are all disposed;

[0016] The housing includes a bottom plate and a top cover disposed opposite to each other, and a side frame connected between the bottom plate and the top cover, wherein the bottom plate, the top cover and the side frame enclose the receiving cavity.

[0017] In some possible implementations, the base plate includes:

[0018] A liquid cooling plate is connected to the side frame. The liquid cooling plate includes an upper plate and a lower plate that are arranged opposite to each other. The upper plate and the lower plate form a flow channel and are brazed together.

[0019] A protective plate is disposed on the side of the liquid cooling plate opposite to the side frame.

[0020] In some possible implementations, the flow channel is formed on the surface of the lower plate facing the upper plate, and the upper plate is provided with an inlet and an outlet that communicate with the flow channel.

[0021] In some possible implementations, the battery pack further includes:

[0022] A water nozzle is disposed on the side frame and partially located outside the receiving cavity. The water nozzle is also connected to the flow channel and is injection molded.

[0023] In some possible implementations, the battery pack further includes:

[0024] A connector for connecting the battery cell; the connector is an aluminum busbar.

[0025] Secondly, embodiments of this application provide an electrical device including the battery pack described above.

[0026] The battery pack and electrical device provided in this application include a battery cell, a circuit board, and a battery management system. The circuit board is mounted on the battery cell and connected to it. One end of the circuit board has a first terminal. The battery management system is located beside the battery cell and has a second terminal, which is directly inserted into the first terminal. By directly connecting the circuit board and the battery management system, wiring harnesses can be omitted, reducing costs and maintaining internal space simplicity. Furthermore, direct insertion increases the electrical reliability within the battery pack, simplifies installation, and improves battery pack production efficiency. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] Figure 1 A schematic diagram of the battery pack provided in this application;

[0029] Figure 2A schematic diagram of the circuit board and battery pack management system provided in this application;

[0030] Figure 3 A schematic diagram of the battery pack circuit breaker unit provided in this application;

[0031] Figure 4 A schematic diagram of the enclosure provided in this application;

[0032] Figure 5 A schematic diagram of the liquid cooling plate provided in this application;

[0033] Figure 6 A schematic diagram of the faucet provided in this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10-cell;

[0036] 20-Box;

[0037] 21-Top cover;

[0038] 22-Side frame;

[0039] 23-Liquid cooling plate;

[0040] 24-Guard plate;

[0041] 31-Upper plate body;

[0042] 32-Lower plate body;

[0043] 33-Flow channel;

[0044] 40 - Circuit board;

[0045] 41 - First terminal;

[0046] 42 - Third terminal;

[0047] 50-Battery Management System;

[0048] 60 - Battery pack circuit breaker unit;

[0049] 61-Pallet;

[0050] 62- Devices;

[0051] 63 - Vibration damping feet;

[0052] 70-Water tap.

[0053] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0054] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0055] In related technologies, the production cost of battery packs is relatively high because the circuit boards and battery management system are connected by wiring harnesses. When there are multiple circuit boards, multiple wiring harness branches are formed. For example, if a battery pack has six circuit boards, using traditional wiring harness connections will create six wiring harness branches. The wiring harnesses are crisscrossed and have complex routing.

[0056] Furthermore, the battery pack uses copper connectors to link the cells, which is costly and heavy. The water taps are made of AL3003 steel, which is also costly and heavy. The liquid cooling plate is also thick, resulting in high cost and weight.

[0057] Therefore, this application provides a battery pack and electrical device that directly connects the circuit board and battery management system without the need for wiring harnesses, reducing costs and maintaining a clean internal space. Simultaneously, it increases the electrical reliability of the battery pack, simplifies installation, and improves battery pack production efficiency.

[0058] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0059] This application provides an electrical device, which can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, electric boats, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Electric vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles.

[0060] The aforementioned electrical equipment includes a battery pack for storing and providing electrical energy. For example, an electric vehicle may have a battery pack internally located, which may be situated at the bottom, front, or rear of the vehicle. The battery pack can be used to power the electric vehicle; for instance, it can serve as the operating power source. The electric vehicle may also include a controller and a motor. The controller controls the battery pack to supply power to the motor, for example, to meet the power requirements for starting, navigation, and driving the electric vehicle. In some embodiments of this application, the battery pack can not only serve as the operating power source for the electric vehicle but also as its drive power source, replacing or partially replacing fuel or natural gas to provide driving power.

[0061] See Figures 1 to 6 The battery pack includes battery cells 10, circuit boards 40, and a battery management system 50. The battery cells 10 can be, for example, prismatic cells, blade cells, or cylindrical cells. There can be multiple battery cells 10, meaning the battery pack includes multiple battery cells 10. These multiple battery cells 10 can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the multiple battery cells 10 are connected in series and others in parallel.

[0062] Multiple battery cells 10 can be combined into a battery module, and several battery modules can then be combined into a battery pack, i.e., the battery pack is integrated using the CTM (Cell To Module) method. Battery cells 10 can also be directly combined into a battery pack, i.e., the battery pack is integrated using the CTP (Cell to Pack) method. In other examples, the battery pack can also be integrated using the CTB (Cell To Body) method. The embodiments of this application do not limit the specific structure and integration method of the battery cells 10.

[0063] In some possible examples, the battery cell 10 includes a positive electrode, a negative electrode, and an explosion-proof valve. The positive electrode, negative electrode, and explosion-proof valve can be arranged on the same side, for example, all on the top surface of the battery cell 10. The positive electrode and negative electrode can also be arranged on opposite sides, for example, on two opposite sides of the battery cell 10. The explosion-proof valve can be arranged on the same side as the positive electrode or the negative electrode.

[0064] The circuit board 40 is, for example, a flexible printed circuit board (FPC), and its extension direction is consistent with the arrangement direction of the multiple battery cells 10, such as the same as the thickness direction of the battery cells 10. The thickness direction of the battery cells 10 can be the length direction of the battery pack, such as... Figure 1 The X direction shown; the height direction of cell 10 can be the height direction of the battery pack, such as... Figure 1 In the Z direction shown, the length direction of cell 10 can be the width direction of the battery pack, such as... Figure 1 Y direction shown in .

[0065] like Figure 1 As shown, circuit board 40 is disposed on battery cell 10, for example, on the top of battery cell 10 and opposite to the middle region of battery cell 10. Circuit board 40 is also connected to battery cell 10, for example, as shown in... Figure 3 As shown, the circuit board 40 includes multiple third terminals 42, which are disposed on both sides of the circuit board 40. The multiple third terminals 42 on each side are arranged along the extension direction of the circuit board 40, and each third terminal 42 is connected to a corresponding battery cell 10. The material of the third terminals 42 can be copper, aluminum, nickel, etc.

[0066] In some possible examples, the battery pack also includes connectors that connect the battery cells 10. The connectors are made of aluminum busbars. The connectors can be sheet-like or strip-like, and can be used to connect corresponding battery cells 10 in series or parallel. The edges of the connectors and battery cells 10 are opposite each other. Using aluminum busbars for the connectors reduces cost and weight compared to T2 copper busbars. The third terminal 42 is welded or bonded to the connector, but this is not limited to this embodiment.

[0067] Continue reading Figure 1 and Figure 2 The circuit board 40 also has a first terminal 41 at one end. The first terminal 41 is provided at one end of opposite ends along the extension direction of the circuit board 40 and protrudes from the circuit board 40. For example, the circuit board 40 is located above the battery cell 10, the first terminal 41 is connected to one end of the circuit board 40 and extends to the side of the battery cell 10 so as to connect to the battery management system 50 next to the battery cell 10.

[0068] In some possible examples, multiple circuit boards 40 are provided, each circuit board 40 having a corresponding first terminal 41 located on the same side of the battery cell 10, so as to connect each first terminal 41 externally, for example, to the battery management system 50.

[0069] Continue reading Figure 1 and Figure 2 The battery management system 50 is used to manage and maintain each battery cell 10, prevent overcharging and over-discharging, extend the battery pack's lifespan, and monitor the battery pack's status. The battery management system 50 is located beside the battery cell 10 and has a second terminal that is directly inserted into the first terminal 41. The second terminal is integrated into the battery management system 50 and directly connected to the first terminal 41. Compared to using a wiring harness, this reduces costs and maintains a clean internal space. It also increases the electrical reliability within the battery pack, simplifies installation, and improves battery pack production efficiency.

[0070] In some possible examples, the first terminal 41 is provided with a corresponding socket, and the second terminal is provided with a corresponding pin. The pin is adapted to the socket to realize the direct connection between the first terminal 41 and the second terminal, so that the first terminal 41 and the second terminal are in direct contact and electrically connected.

[0071] In some possible implementations, the battery pack further includes a support layer disposed between the battery cell 10 and the circuit board 40, and the support layer is insulated. The support layer supports the circuit board 40, eliminating the need for a tray 61 on the battery cell 10 to support the circuit board 40, thus reducing production costs. The support layer is positioned opposite the circuit board 40, for example, directly below the circuit board 40. The support layer may also have clearance holes that fit over the explosion-proof valve and are spaced apart from the positive / negative terminals.

[0072] The support layer can be made of foam to provide insulation. The support layer may not be fixed; it can be fixed between the circuit board 40 and the battery cell 10, with the support layer sandwiched between them. Alternatively, the support layer and the battery cell 10 can be bonded together. Multiple support layers can be provided, with each circuit board 40 corresponding to one support layer.

[0073] See Figure 1 and Figure 3 The battery pack also includes a battery distribution unit (BDU) 60, which is located beside the battery cell 10. The battery distribution unit 60 includes a tray 61 and at least two devices 62 distributed within the tray 61. The battery distribution unit 60 is used for power distribution to achieve smooth charging and discharging of the battery pack.

[0074] The battery pack circuit breaker unit 60 is located beside and connected to the battery cell 10. The battery pack circuit breaker unit 60 includes a tray 61, which carries various components 62. At least two components 62 are housed within the tray 61, and each component 62 is fixedly connected to the tray 61. The components 62 are one of the following: a fuse, a main positive relay, a main negative relay, a pre-charge relay, a pre-charge resistor, or a sensor. The components 62 are distributed within the tray 61, and the tray 61 is open, not located on the top cover 21, which reduces the size of the battery pack circuit breaker unit 60 and simplifies its structure.

[0075] In some possible examples, the battery pack circuit breaker unit 60 also includes a vibration damping foot 63, which is disposed on the outside of the tray 61 and connected to the tray 61. The vibration damping foot 63 is disposed on the side of the tray 61 and fixed relative to the tray 61 to reduce the noise of the entire battery pack. For example, the vibration damping foot 63 protrudes from the bottom surface of the tray 61 and is connected to the housing 20 of the battery pack, so that there can be a certain gap between the tray 61 and the housing 20.

[0076] The vibration damping foot 63 may include an elastic element and a connector connected to the elastic element. One end of the connector is connected to the tray 61, and the other end is connected to the battery pack housing 20. The elastic element is, for example, a rubber column, located within the connector. The connector may include, for example, two interconnected and relatively movable parts. An elastic element is disposed between these two parts, connecting the tray 61 and the housing 20 respectively. The structure of the vibration damping foot 63 is not limited in this embodiment; for example, the vibration damping foot 63 may include a sleeve and a spring disposed within the sleeve.

[0077] See Figure 1 and Figure 4 The battery pack also includes a housing 20, which has a receiving cavity. The battery cells 10, circuit boards 40, and battery management system 50 are all housed within the receiving cavity to provide support and protection. The housing 20 includes a bottom plate and a top cover 21 disposed opposite each other, and a side frame 22 connected between the bottom plate and the top cover 21. The bottom plate, the top cover 21, and the side frame 22 enclose the receiving cavity.

[0078] The top cover 21 can be made of galvanized sheet, such as hot-dip galvanized steel sheet, to improve its corrosion resistance. In this embodiment, the material of the top cover 21 is DC54D+Z. The bottom plate is opposite to the top cover 21, for example, directly opposite it. The side frame 22 connects the top cover 21 and the bottom plate, for example, the three are connected by threaded fasteners. The material of the side frame 22 includes roll-formed steel, such as DP780, which can reduce the cost of the battery pack compared to aluminum, especially in mass production, and improve the strength of the battery pack.

[0079] See some possible examples. Figure 4 and Figure 5 The base plate includes a liquid cooling plate 23 and a protective plate 24. The liquid cooling plate 23 is connected to the side frame 22. The liquid cooling plate 23 includes an upper plate 31 and a lower plate 32 arranged opposite to each other. The upper plate 31 and the lower plate 32 form a flow channel 33 and are brazed together. The protective plate 24 is located on the side of the liquid cooling plate 23 away from the side frame 22. In this way, the liquid cooling plate 23 is integrated into the base plate, which can realize integrated liquid cooling and has a higher space utilization rate compared with distributed liquid cooling. At the same time, the brazing of the upper plate 31 and the lower plate 32 can reduce the thickness of the upper plate 31 and / or the lower plate 32, reduce the cost and weight of the battery pack.

[0080] The battery pack comprises a protective plate 24, a lower plate 32, and an upper plate 31 stacked sequentially. The protective plate 24 provides protection for the bottom of the battery pack and is made of rolled steel, such as HC950, to reduce the cost and increase the strength of the battery pack. The lower plate 32 is mounted on the protective plate 24 and is fixedly connected to the upper plate 31, forming a closed flow channel 33. The upper plate 31 is connected to the side frame 22. For example, the protective plate 24, lower plate 32, upper plate 31, side frame 22, and top cover 21 are connected by threaded fasteners.

[0081] Continue reading Figure 5 The lower plate 32 has a flow channel 33 on its surface facing the upper plate 31, and the upper plate 31 has an inlet and an outlet that flow through the flow channel 33. Figure 5 As shown, the top surface of the lower plate 32 has a flow channel 33, while the upper plate 31 does not have a flow channel 33. This eliminates the need for splicing the flow channels 33, preventing misalignment. Simultaneously, the upper plate 31 does not need to be slotted, allowing for thinning to reduce cost and weight. For example, the thickness of the lower plate 32 is 1 mm, and the thickness of the upper plate 31 is 1 mm or less. In other examples, the surfaces of the lower plate 32 and the upper plate 31 facing each other have grooves, which together form the flow channel 33.

[0082] The upper plate 31 is provided with an inlet and an outlet, both of which are connected to the flow channel 33. The upper plate 31 is, for example, a flat plate. The flow channel 33 and the inlet and outlet are located on two separate plates, which reduces the processing of the lower plate 32, ensures the structural strength of the lower plate 32, and facilitates the processing and manufacturing of the flow channel 33, the inlet, and the outlet.

[0083] To allow coolant to flow into the flow channel 33 to cool the battery cell 10, see some possible examples. Figure 1 and Figure 6 The battery pack also includes a water nozzle 70, which is disposed on the side frame 22 and partially located outside the receiving cavity. The water nozzle 70 communicates with the flow channel 33 and is injection molded. The water nozzle 70 can communicate with the flow channel 33 through an inlet and an outlet, for example, one water nozzle 70 can be connected to each inlet and outlet respectively. The water nozzle 70 is disposed on the side frame 22 and connected to the side frame 22 by fasteners. At least part of the water nozzle 70 is located outside the receiving cavity and can extend through the side frame 22 into the receiving cavity to communicate with the flow channel 33.

[0084] The water nozzle 70 is injection molded from plastic, which reduces cost and weight compared to AL3003. The coolant can be water, mineral oil, synthetic oil, glycol-based liquid, etc., and this embodiment is not limited to these materials.

[0085] The battery pack provided in this embodiment includes a battery cell 10, a circuit board 40, and a battery management system 50. The circuit board 40 is disposed on the battery cell 10 and connected to the battery cell 10. One end of the circuit board 40 has a first terminal 41. The battery management system 50 is disposed beside the battery cell 10 and has a second terminal, which is directly inserted into the first terminal 41. By directly connecting the circuit board 40 and the battery management system 50, wiring harnesses can be omitted, reducing costs and maintaining the simplicity of the internal space. Furthermore, direct insertion can increase the electrical reliability within the battery pack, simplify installation, and improve battery pack production efficiency.

[0086] The embodiments or implementation methods described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. In this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. 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 can be combined in any suitable manner in one or more embodiments or examples.

[0087] Finally, it should be noted that other embodiments of this utility model will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, include: Battery cell; A circuit board is disposed on the battery cell and connected to the battery cell. One end of the circuit board has a first terminal. A battery management system is disposed next to the battery cell, and the battery management system has a second terminal that is directly inserted into the first terminal.

2. The battery pack according to claim 1, characterized in that, The battery pack also includes: A support layer is disposed between the battery cell and the circuit board, and the support layer is insulated.

3. The battery pack according to claim 1, characterized in that, The battery pack also includes: A battery pack circuit breaker unit is disposed next to the battery cell. The battery pack circuit breaker unit includes a tray and at least two devices distributed within the tray.

4. The battery pack according to claim 3, characterized in that, The battery pack circuit breaker unit also includes: Vibration-damping feet are located on the outside of the tray and connected to the tray.

5. The battery pack according to claim 1, characterized in that, The battery pack also includes: The housing has a receiving cavity, in which the battery cell, the circuit board, and the battery management system are all disposed; The housing includes a bottom plate and a top cover disposed opposite to each other, and a side frame connected between the bottom plate and the top cover, wherein the bottom plate, the top cover and the side frame enclose the receiving cavity.

6. The battery pack according to claim 5, characterized in that, The base plate includes: A liquid cooling plate is connected to the side frame. The liquid cooling plate includes an upper plate and a lower plate that are arranged opposite to each other. The upper plate and the lower plate form a flow channel and are brazed together. A protective plate is disposed on the side of the liquid cooling plate opposite to the side frame.

7. The battery pack according to claim 6, characterized in that, The lower plate has the flow channel on its surface facing the upper plate, and the upper plate has an inlet and an outlet that flow through the flow channel.

8. The battery pack according to claim 6, characterized in that, The battery pack also includes: A water nozzle is disposed on the side frame and partially located outside the receiving cavity. The water nozzle is also connected to the flow channel and is injection molded.

9. The battery pack according to claim 1, characterized in that, The battery pack also includes: A connector for connecting the battery cell; the connector is an aluminum busbar.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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