Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment, the battery pack comprises a shell, a power battery pack, a storage battery pack and a power distribution assembly, the power battery pack, the storage battery pack and the power distribution assembly are all accommodated in the shell, the power distribution assembly comprises a DC-DC controller, and the DC-DC controller is connected with the storage battery pack and the power battery pack. According to the design, when the battery pack is used for the electric equipment (such as a new energy vehicle), the storage battery pack is integrated in the shell, and the power distribution assembly comprises the DC-DC controller, so that the space utilization rate of the electric equipment can be effectively improved. Compared with a traditional scheme, a high-voltage line between the distribution box and the DC-DC controller and a low-voltage line between the DC-DC controller and the storage battery pack can be shortened, and the cost and the weight of electric equipment are effectively reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to a battery pack and an electrical device. Background Art

[0002] In new energy vehicles, the power battery pack needs to be stepped down by a DC-DC controller (transformer) to charge the battery, and then the battery supplies power to the low-voltage system of the vehicle. Among them, the power battery pack and the DC-DC controller need to be connected by high-voltage wires, and the DC-DC controller and the battery also need to be connected by wires, resulting in cluttered vehicle lines and potential safety hazards. In addition, the DC-DC controller and the battery occupy additional vehicle space, resulting in low vehicle space utilization. In addition, due to the high weight and cost of high-voltage wires, especially when the power battery pack and the DC-DC controller are far apart (for example, when the two are located in front and behind the vehicle), the high voltage of the vehicle is longer, the cost is higher, and the weight is larger. Utility Model Content

[0003] The purpose of the present disclosure is to provide a battery pack and an electric device to at least partially solve the problems existing in the related art.

[0004] In order to achieve the above-mentioned objectives, the present disclosure provides a battery pack, comprising a shell, a power battery pack, a storage battery pack and a power distribution component, wherein the power battery pack, the storage battery pack and the power distribution component are all accommodated inside the shell, and the power distribution component comprises a DC-DC controller, and the DC-DC controller connects the storage battery pack and the power battery pack.

[0005] Optionally, a separator is provided between the power battery pack and the storage battery pack.

[0006] Optionally, the shell is provided with an inspection port opposite to the power distribution assembly, and the inspection port cover is provided with an inspection cover.

[0007] Optionally, the shell includes a partition beam, and the power distribution assembly is installed in the partition beam.

[0008] Optionally, there are multiple power battery packs, the shell includes a tray, a crossbeam is provided in the tray, and the crossbeam is used to separate the multiple power battery packs; the crossbeam is provided with a receiving groove open toward the inspection port, and the power distribution assembly is arranged in the receiving groove.

[0009] Optionally, the crossbeam includes a first mounting portion, and the power distribution assembly includes a second mounting portion, and the first mounting portion and the second mounting portion are detachably connected.

[0010] Optionally, the DC-DC controller is electrically connected to the power supply unit of the power distribution assembly through a first positive copper busbar and a first negative copper busbar, and the DC-DC controller is electrically connected to the battery pack through a second positive copper busbar and a second negative copper busbar.

[0011] Optionally, the battery pack and the DC-DC controller are arranged relative to each other, and the DC-DC controller is located at one end of the power battery pack close to the battery pack.

[0012] Optionally, the battery cells constituting the power battery pack are the same as the battery cells constituting the storage battery pack.

[0013] According to a second aspect of the present disclosure, there is provided an electrical device comprising the above-mentioned battery pack.

[0014] Through the above technical solution, when the battery pack is used in electrical equipment (such as new energy vehicles), since the battery pack, power battery pack and power distribution assembly are integrated in the shell, and the power distribution assembly includes a DC-DC controller, the space utilization rate of the electrical equipment can be effectively improved. In addition, compared with the traditional solution of arranging the battery pack and the DC-DC controller outside the shell, the power battery pack and the DC-DC controller need to be connected by a longer high-voltage line, and the DC-DC controller and the battery pack need to be connected by a longer low-voltage line. Such a design can effectively shorten the high-voltage line between the power distribution assembly and the DC-DC controller and shorten the low-voltage line between the DC-DC controller and the battery pack, effectively reducing the cost and weight of the electrical equipment.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the connection relationship between the battery pack, the DC-DC controller and the battery pack in the prior art;

[0018] Figure 2 is an exploded view of a battery pack exemplarily shown according to the present disclosure;

[0019] Figure 3 yes Figure 2 A top cross-sectional view of a battery pack shown in FIG.

[0020] Figure 4 yes Figure 2 A partial exploded view of the bottom position of the battery pack shown in FIG.

[0021] Figure 5 yes Figure 2 Schematic diagram of the power distribution assembly and DC-DC controller of the battery pack shown in FIG.

[0022] Figure 6 yes Figure 2 A partial connection diagram of a DC-DC controller of a battery pack and a battery pack is shown in FIG.

[0023] Figure 7 yes Figure 2 Schematic diagram of the partial connection between the power distribution assembly of the battery pack and the shell.

[0024] Description of Reference Numerals

[0025] 100, 100'-shell; 110-tray; 120-sealing cover; 130-crossbeam; 140-inspection port; 150-inspection cover; 200-power battery pack; 210-first module; 220-second module; 300, 300'battery pack; 400-distribution assembly; 410-insurance; 420-main positive relay; 430-main negative relay; 440-pre-charge relay; 450-HVSU; 460-pre-charge resistor; 500, 500'-DC-DC controller; 600-bolt; 710-first positive copper busbar; 720-first negative copper busbar; 730-second positive copper busbar; 740-second negative copper busbar; 800-separator; 910-first mounting portion; 920-second mounting portion. DETAILED DESCRIPTION

[0026] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0027] In the present disclosure, unless otherwise stated, directional words such as "inside, outside", "top, bottom" may be based on the structure of the relevant parts themselves, or may be based on the orientation of the relevant parts when used in combination. For example: the power battery pack, storage battery pack and power distribution assembly are integrated "inside" of the shell, which means that the power battery pack, storage battery pack and power distribution assembly are integrated in the accommodating space of the shell; an inspection port is provided at the "bottom surface" of the tray at a position corresponding to the power distribution assembly, and the "bottom surface" here refers to the formed surface of the tray opposite to the sealing cover.

[0028] In the present disclosure, the terms "first", "second", etc. are used to distinguish one element from another element, and do not have order and importance. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] In order to better understand the technical solution of the present disclosure, Figure 1 The figure shows a connection relationship between a battery pack, a battery group 300' and a DC-DC controller 500' in the prior art, wherein the DC-DC controller 500' and the battery group 300' are located outside the battery pack shell 100', the battery pack and the DC-DC controller 500' are connected by a high-voltage line, and the DC-DC controller 500' and the battery group 300' are connected by a low-voltage line. When the battery pack is used in electrical equipment, the high-voltage line and the low-voltage line will make the circuit of the electrical equipment complicated. Since the high-voltage line is thicker and more expensive, it will lead to increased cost and weight, and the battery group 300' and the DC-DC controller 500' need to occupy additional space in the electrical equipment, resulting in low space utilization.

[0030] For the above technical issues, refer to Figure 2-Figure 7 The present disclosure provides a battery pack, including a housing 100, a power battery pack 200, a storage battery pack 300 and a power distribution assembly 400. The power battery pack 200, the storage battery pack 300 and the power distribution assembly 400 are all accommodated in the housing 100, and the power distribution assembly 400 includes a DC-DC controller 500, which connects the storage battery pack 300 and the power battery pack 200. It should be noted that the DC-DC controller 500 and the power battery pack 200 can be directly or indirectly connected. Specifically, when the power distribution assembly 400 includes a power supply unit to be described below, the output end of the DC-DC controller 500 can be directly connected to the storage battery pack 300, and the input end can be indirectly connected to the power battery pack 200 through the power supply unit, and the present disclosure does not limit this.

[0031] The present disclosure does not limit the specific voltage, internal structure, etc. of the power battery pack 200 and the storage battery pack 300, and both may include multiple battery cells. Among them, the battery cells of both may be configured as blade batteries, or only the power battery pack 200 may be a blade battery cell. When in use, the power distribution component 400 can charge the storage battery pack 300 after the power battery pack 200 is stepped down through the DC-DC controller 500, so as to power the low-voltage system of the electrical equipment.

[0032] It should be explained that the power distribution assembly 400 refers to a device with multiple power distribution functions, which is mainly used to manage and control the power flow between the power battery pack 200 and other electrical systems of the power-consuming equipment, and its main functions include power distribution, power management, fault detection and protection, etc. The DC-DC controller 500 refers to a connection device between the power battery pack 200 and the storage battery pack 300, and its main function is to convert the high voltage of the power battery pack 200 into the low voltage of the storage battery pack 300. Since the structure and principle of the power distribution assembly 400 and the DC-DC controller 500 are well known to those skilled in the art, they will not be introduced in detail here.

[0033] By using the above technical solution, when the battery pack is used in electrical equipment (such as new energy vehicles), since the battery pack 300, the power battery pack 200 and the power distribution assembly 400 are integrated in the housing 100, and the power distribution assembly 400 includes a DC-DC controller 500, the space utilization rate of the electrical equipment can be effectively improved. In addition, compared with the traditional solution of arranging the battery pack 300 and the DC-DC controller 500 outside the housing 100, the power battery pack 200 and the DC-DC controller 500 need to be connected by a longer high-voltage line, and the DC-DC controller 500 and the battery pack 300 need to be connected by a longer low-voltage line. Such a design can effectively shorten the high-voltage line between the power distribution assembly 400 and the DC-DC controller 500 and shorten the low-voltage line between the DC-DC controller 500 and the battery pack 300, effectively reducing the cost and weight of the electrical equipment.

[0034] Reference Figure 6 In an embodiment of the present disclosure, a separator 800 may be provided between the power battery pack 200 and the storage battery pack 300. The separator 800 may separate the power battery pack 200 and the storage battery pack 300, block the gas flow between the two and reduce the heat transfer, thereby effectively avoiding the thermal hazards of one of them from affecting the other. The present disclosure does not limit the type of separator 800. For example, in some embodiments, the separator 800 may be a heat insulating member. In addition, in some other embodiments, in order to avoid damage caused by collision between two battery modules, the separator 800 may also be a buffer, such as a buffer pad.

[0035] Reference Figure 4In an embodiment of the present disclosure, the housing 100 may be provided with an inspection port 140 opposite to the power distribution assembly 400, and the inspection port 140 is covered with an inspection cover 150. With such a design, when installing the power distribution assembly 400, the inspection cover 150 may be opened first, and then the power distribution assembly 400 may be installed through the inspection port 140 and the inspection cover 150 may be covered. When the power distribution assembly 400 needs to be inspected, it is only necessary to open the inspection cover 150 for inspection. It should be noted that when the housing 100 has the tray 110 and the sealing cover 120 described below, the inspection port 140 may be formed on the tray 110, or may also be formed on the sealing cover 120. Preferably, when the battery pack is installed in a new energy vehicle, an inspection port 140 can be formed at the bottom of the tray 110. With such a design, when the power distribution assembly 400 needs to be inspected, it is only necessary to open the inspection cover 150 and inspect the power distribution assembly 400 from the inspection port 140. There is no need to disassemble the entire battery pack from the vehicle and open the sealing cover 120 on the upper side of the battery pack before taking out the power distribution assembly 400 for inspection. The operation is convenient and simple.

[0036] In an embodiment of the present disclosure, the housing 100 may include a partition beam, and the power distribution assembly 400 may be installed in the partition beam. Installing the power distribution assembly 400 in the partition beam does not require occupying other space in the housing 100, so that more accommodation space can be used to accommodate the power battery pack 200, thereby improving the space utilization in the housing 100 and the battery pack's endurance. It should be explained that the partition beam here can be a side beam constituting the tray 110 for separating the interior of the battery pack from the external environment, or it can also be a crossbeam 130 arranged in the tray 110 to separate multiple modules of the power battery pack 200 or the power battery pack 200 and the battery pack 300 mentioned below.

[0037] Reference Figure 2 and Figure 3 In the embodiment of the present disclosure, there may be multiple power battery packs 200, and the housing 100 may include a tray 110. A crossbeam 130 may be provided in the tray 110. The crossbeam 130 may be used to separate multiple power battery packs 200. The crossbeam 130 may be provided with a receiving slot open toward the inspection port 140, and the power distribution assembly 400 is arranged in the receiving slot. With such a design, the airflow and heat exchange between different power battery packs 200 are reduced by separating the multiple power battery packs 200 with the crossbeam 130, which can effectively avoid the heat hazards and magnetic effects caused by all the cells of the power battery pack 200 being concentrated together, which is more conducive to heat dissipation, reducing safety hazards and improving the service life of the battery pack. In addition, the crossbeam 130 can also strengthen the housing 100 of the battery pack, improve the structural strength, and thus improve the service life of the battery pack. Directly forming a receiving slot in the crossbeam 130 and making the opening of the receiving slot facing the inspection port 140 can facilitate the gap and installation of the power distribution assembly 400.

[0038] The present disclosure does not limit the number of power battery packs 200. Figure 2 and Figure 3 In the illustrated embodiment, the number of modules may be two, specifically, the first module 210 and the second module 220. In addition, in some other embodiments, in addition to the first module 210 and the second module 220, the module may also include a third module, a fourth module, and the like.

[0039] In order to fix the power distribution assembly 400 to the beam 130, refer to Figure 7 In the embodiment of the present disclosure, the crossbeam 130 may include a first mounting portion 910, and the power distribution assembly 400 may include a second mounting portion 920. The first mounting portion 910 and the second mounting portion 920 are detachably connected. With such a design, the power distribution assembly 400 can be easily installed on the crossbeam 130 and removed from the crossbeam 130. Specifically, in Figure 7 In the illustrated embodiment, the first mounting portion 910 and the second mounting portion 920 may be detachably connected by a plurality of bolts 600. In addition, in some other embodiments, the first mounting portion 910 and the second mounting portion 920 may also be detachably connected by a snap-fit ​​structure or the like.

[0040] In addition to the above-mentioned crossbeam 130 having a receiving groove, in some other embodiments, the crossbeam 130 may include a first center beam (not shown in the figure) and a second center beam (not shown in the figure) spaced apart from each other, and the power distribution assembly 400 may be detachably installed between the first center beam and the second center beam. It should be noted that the first center beam and the second center beam here may be two independent beams. The power distribution assembly 400 may be detachably connected to the first center beam and the second center beam by a plurality of bolts 600. Specifically, when the power distribution assembly 400 needs to be installed, the inspection cover 150 may be opened first, and the power distribution assembly 400 may be extended from the inspection port 140 between the first center beam and the second center beam, and then the power distribution assembly 400 may be fixed between the first center beam and the second center beam from the bottom by bolts 600.

[0041] Reference Figure 5-Figure 6In an embodiment of the present disclosure, the DC-DC controller 500 and the power supply unit of the power distribution assembly 400 can be electrically connected through the first positive copper bus 710 and the first negative copper bus 720, and the DC-DC controller 500 and the battery pack 300 can be electrically connected through the second positive copper bus 730 and the second negative copper bus 740. Replacing high-voltage wires and low-voltage wires with copper buses can further reduce the cost and weight of the battery pack (high-voltage wires are expensive and heavy), and the copper bus occupies less space than the wires, which can further improve the space utilization. It should be noted that when the power distribution assembly 400 includes a power supply unit, the power distribution assembly 400 can distribute part of the voltage of the power battery pack 200 to the DC-DC controller 500 through the power supply unit for voltage reduction processing, and supply power to the battery pack 300 after the voltage reduction processing.

[0042] The present disclosure does not limit the specific structure of the power distribution assembly 400. Figure 5 In the illustrated embodiment, the power distribution assembly 400 may further include a fuse 410, a main positive relay 420, and a main negative relay 430 for being electrically connected to the power battery pack 200. The main positive relay 420 and the main negative relay 430 may control the on-off of the circuit, and the fuse 410 may protect the circuit.

[0043] Furthermore, in order to avoid excessive current in the circuit, there are certain hidden dangers in directly controlling the circuit through the main positive relay 420 and the main negative relay 430. The power distribution component 400 may also include a pre-charge relay 440 and a pre-charge resistor 460 connected in parallel with the main positive relay 420. The circuit formed by the pre-charge relay 440 and the pre-charge resistor 460 can control the on and off of the main positive relay 420 and the main negative relay 430 to indirectly control the on and off of the circuit, thereby improving the safety performance of the circuit.

[0044] Reference Figure 5 In the embodiment of the present disclosure, the power distribution assembly 400 may further include a HVSU 450 (High Voltage Supply Unit) for connecting the power battery pack 200. The HVSU is used to increase the battery voltage to a high voltage sufficient to drive the motor, and ensure the normal operation of the electrical equipment through the high voltage regulator and the DC-DC controller 500. Since the structure and principle of the HVSU 450 are well known to those skilled in the art, they will not be described in detail here.

[0045] In the case where the power distribution assembly 400 has the above-mentioned components, the specific current flow direction of the circuit of the battery pack can be: the positive electrode of the power battery pack 200-the third positive copper bar (not shown in the figure)-the insurance 410-the main positive relay 420-the positive electrode of the power distribution assembly 400-the first positive copper bar 710-the positive electrode of the DC-DC controller 500-the second positive copper bar 730-the positive electrode of the battery pack 300-the negative electrode of the battery pack 300-the second negative copper bar 740-the negative electrode of the DC-DC controller 500-the first negative copper bar 720-the negative electrode of the power distribution assembly 400-the HVSU450-the negative electrode of the power battery pack 200. Of course, it should be clear that the current flow direction in the circuit described here is only an exemplary description, and it can be specifically designed according to the adaptability of the electrical components of the power distribution assembly 400.

[0046] Reference Figure 6 In the embodiment of the present disclosure, the battery pack 300 and the DC-DC controller 500 may be arranged relative to each other, and the DC-DC controller 500 may be located at one end of the power battery pack 200 close to the battery pack 300. Specifically, the DC-DC controller 500 may be located between the power battery pack 200 and the battery pack 300, for example, between the first module 210 and the battery pack 300, or between the second module 220 and the battery pack 300. With such a design, the distance between the DC-DC controller 500 and the battery pack 300 may be shortened, thereby reducing the length of the second positive copper busbar 730 and the second negative copper busbar 740, thereby reducing the cost and the complexity of the circuit.

[0047] In the embodiment of the present disclosure, the cells constituting the power battery pack 200 and the cells constituting the storage battery pack 300 may be the same. For example, the cell types of the power battery pack 200 and the storage battery pack 300 may both be lithium iron phosphate cells. Compared with lead-acid batteries, lithium iron phosphate cells have higher specific energy, longer service life, and lower pollution risk than lead-acid batteries. The cells constituting the power battery pack 200 and the cells constituting the storage battery pack 300 are configured to be the same, which can effectively reduce the difficulty of the production process and procurement of the battery pack.

[0048] According to a second aspect of the present disclosure, there is provided an electrical device including the above-mentioned battery pack. Since the electrical device has all the beneficial effects of the above-mentioned battery pack, they are not described in detail here.

[0049] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0051] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A battery pack, characterized in that: It includes a shell, a power battery pack, a storage battery pack and a power distribution component, wherein the power battery pack, the storage battery pack and the power distribution component are all accommodated in the shell, and the power distribution component includes a DC-DC controller, which connects the storage battery pack and the power battery pack.

2. The battery pack according to claim 1, wherein: A separator is provided between the power battery pack and the storage battery pack.

3. The battery pack according to claim 1, wherein: The shell is provided with an inspection port opposite to the power distribution assembly, and the inspection port cover is provided with an inspection cover.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The housing includes a partition beam, and the power distribution assembly is installed in the partition beam.

5. The battery pack according to claim 3, wherein: There are multiple power battery packs, and the housing includes a tray. A crossbeam is provided in the tray, and the crossbeam is used to separate the multiple power battery packs; The crossbeam is provided with a receiving groove open toward the inspection port, and the power distribution assembly is arranged in the receiving groove.

6. The battery pack according to claim 5, characterized in that: The crossbeam includes a first mounting portion, and the power distribution assembly includes a second mounting portion, and the first mounting portion and the second mounting portion are detachably connected.

7. The battery pack according to claim 1, wherein: The DC-DC controller is electrically connected to the power supply unit of the power distribution assembly through a first positive copper busbar and a first negative copper busbar, and the DC-DC controller is electrically connected to the battery pack through a second positive copper busbar and a second negative copper busbar.

8. The battery pack according to claim 1, wherein: The battery pack and the DC-DC controller are arranged opposite to each other, and the DC-DC controller is located at one end of the power battery pack close to the battery pack.

9. The battery pack according to claim 1, wherein: The battery cells constituting the power battery pack are the same as the battery cells constituting the storage battery pack.

10. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 9.

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