Battery system and engineering machine

Abstract

The present disclosure relates to a battery system and an engineering machine. The battery system comprises: at least two battery packs arranged sequentially in a first direction and connected in series; each battery pack comprises at least two battery modules, and the at least two battery modules are arranged sequentially in a second direction and connected in parallel. When the charge of electricity needs to be expanded, one or more battery packs can be added, and when the charge of electricity needs to be reduced, one or more battery packs can be removed, thus meeting requirements for large, medium, and small configurations for charge of electricity. The at least two battery modules of each battery pack are connected in parallel, thus reducing the current of each single battery module, and reducing the maximum load of a connector of the single battery module. The amount of heat generated by poles of the battery modules is reduced, lowering the stress on a thermal management system, and alleviating the problem of difficulty in choosing large-flow component models.

Description

Battery systems and construction machinery Technical Field

[0001] This disclosure relates to the field of construction machinery, and more particularly to a battery system and construction machinery. Background Technology

[0002] For construction machinery such as new energy loaders, there are different power configuration requirements, ranging from large to small. In some related technologies, the battery system structure is complex, making it difficult to expand or shrink the battery system's power configuration according to different power requirements. Summary of the Invention

[0003] In one aspect of this disclosure, a battery system is provided, comprising:

[0004] At least two battery packs are arranged sequentially along a first direction and connected in series. Each battery pack includes at least two battery modules, which are arranged sequentially along a second direction and connected in parallel.

[0005] In some embodiments, the battery system further includes:

[0006] A high-voltage box is located on the side of the battery system located in the first direction;

[0007] The first wiring harness connects the positive terminal of the high-voltage box to the positive terminal of the battery pack furthest from or closest to the high-voltage box; and

[0008] The second wiring harness connects the negative terminal of the high-voltage box to the negative terminal of the battery pack closest to or furthest from the high-voltage box.

[0009] In some embodiments, both the first harness and the second harness include at least two lines.

[0010] In some embodiments, the battery system further includes a third wiring harness, wherein the positive terminal of one of the two adjacent battery packs is connected to the negative terminal of the other battery pack via the third wiring harness, the third wiring harness including at least two lines.

[0011] In some embodiments, each of the battery packs further includes:

[0012] At least two first connectors are respectively connected to the negative terminals of the at least two battery modules;

[0013] The first busbar is connected to each of the at least two first connectors;

[0014] At least two MSDs are connected in parallel to the first bus;

[0015] The second bus is connected to each of the at least two MSDs; and

[0016] A high-voltage negative connector is connected to the second busbar.

[0017] In some embodiments, the first busbar is disposed on one side of the battery pack in the first direction, the at least two MSDs, the second busbar and the high voltage negative connector are disposed on the first side of the battery pack in the third direction, and the negative terminals of the at least two battery modules are disposed on the second side of the battery pack in the third direction, with the first side and the second side being two opposite sides.

[0018] In some embodiments, each battery pack further includes two battery modules, and the first busbar is disposed on one side of the battery pack in the first direction and at the location where the two battery modules are adjacent.

[0019] In some embodiments, each of the battery packs further includes a high-voltage positive connector disposed on a first side of the battery pack in the third direction.

[0020] In some embodiments, both the high-voltage negative connector and the high-voltage positive connector are connectors having at least two pins.

[0021] In some embodiments, each of the battery packs further includes:

[0022] At least two second connectors are respectively connected to the positive terminals of the at least two battery modules;

[0023] The third busbar is connected to each of the at least two second connectors; and

[0024] A high-voltage positive connector is connected to the third busbar.

[0025] In some embodiments, the positive terminals of the at least two battery modules, the at least two second connectors, the third busbar and the high-voltage positive connector are all located on the first side of the battery pack in a third direction.

[0026] In some embodiments, the battery system further includes:

[0027] Main water inlet pipe;

[0028] Main water outlet pipe;

[0029] At least two first branch pipes are connected in parallel to the main water inlet pipe, and are respectively connected to the water inlet terminals of the at least two battery packs; and

[0030] At least two second branch pipes are connected in parallel to the main water outlet pipe, and are respectively connected to the water outlet of the at least two battery packs.

[0031] In some embodiments, the main inlet pipe, the main outlet pipe, the at least two first branch pipes, and the at least two second branch pipes are all located on the first side of the battery pack in a third direction.

[0032] In some embodiments, the battery system includes a housing, in which at least two battery packs are disposed, wherein the first direction is the height direction of the housing.

[0033] In some embodiments, the battery system further includes a connecting frame disposed on the outer wall of the housing and connected to at least one of the at least two battery packs located on the upper layer, the connecting frame being further configured to connect to the vehicle frame.

[0034] In some embodiments, the battery system further includes:

[0035] A low-pressure box is located on the side of the battery system located in the first direction;

[0036] At least two low-voltage connectors are respectively disposed on the at least two battery packs, and are located on the first side of the battery system in a third direction; and

[0037] The fourth wiring harness connects the low-voltage box and the at least two low-voltage connectors.

[0038] In one aspect of this disclosure, an engineering machine is provided, including the battery system described above.

[0039] Based on the above technical solution, this disclosure has at least the following beneficial effects:

[0040] In some embodiments, at least two battery packs are arranged sequentially along a first direction and connected in series. One or more battery packs can be added to increase the capacity, and one or more battery packs can be removed to decrease the capacity, thus meeting the needs of different capacity configurations such as large, medium, and small. The parallel connection of at least two battery modules in the battery pack reduces the current of a single battery module, thereby reducing the maximum load on the connectors of a single battery module, reducing the heat generation of the battery module's terminals, reducing the pressure on the thermal management system, and alleviating the difficulty in selecting high-flow-rate components. Attached Figure Description

[0041] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:

[0042] Figure 1 is a front view of a battery system provided according to some embodiments of the present disclosure;

[0043] Figure 2 is a schematic diagram of the high-voltage circuit connection of a battery system provided according to some embodiments of the present disclosure;

[0044] Figure 3 is an exploded structural diagram of a battery pack provided according to some embodiments of the present disclosure;

[0045] Figure 4 is a schematic diagram of the high-voltage circuit connection of a battery pack provided according to some embodiments of the present disclosure;

[0046] Figure 5 is a schematic diagram of a cooling assembly for a battery system provided according to some embodiments of the present disclosure;

[0047] Figure 6 is a three-dimensional structural diagram of a battery system provided according to some embodiments of the present disclosure. Detailed Implementation

[0048] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0049] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0050] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0051] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0052] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0053] Some embodiments of this disclosure provide a battery system and engineering machinery to alleviate the problem of the difficulty in flexibly configuring the power of a battery system.

[0054] Referring to Figures 1 and 2, in some embodiments, the battery system includes at least two battery packs 1.

[0055] At least two battery packs 1 are arranged sequentially along a first direction X, and at least two battery packs 1 are connected in series. Each battery pack 1 includes at least two battery modules 11, and at least two battery modules 11 are arranged sequentially along a second direction Y and connected in parallel.

[0056] In the above embodiments, at least two battery packs 1 are arranged sequentially along the first direction X and connected in series. When it is necessary to increase the power capacity, one or more battery packs 1 can be added, and when it is necessary to reduce the power capacity, one or more battery packs 1 can be removed. Therefore, it can meet the needs of different power capacity configurations such as large, medium and small.

[0057] In the above embodiments, the number of battery packs 1 in the battery system can be odd or even, allowing for flexible configuration.

[0058] In some embodiments, the first direction X is perpendicular to the second direction Y, and the first direction X is also perpendicular to the third direction Z, while the second direction Y is perpendicular to the third direction Z.

[0059] Optionally, the first direction X is the height direction of the battery system, or the first direction X is the vertical direction of the battery system.

[0060] In some embodiments, the specifications of each battery pack 1 are standardized and uniform. Without changing the shape of the battery system's casing, battery systems with two, three, four, five, six or more battery packs can be achieved by stacking the battery packs 1. This allows for convenient capacity expansion and can meet the different capacity configuration requirements of different engineering machinery.

[0061] In the above embodiments, at least two battery modules 11 of the battery pack 1 are connected in parallel, reducing the current of a single battery module, thereby reducing the maximum load of the connector of a single battery module, reducing the heat generation of the battery module's terminals, reducing the pressure on the thermal management system, and alleviating the problem of difficulty in selecting high-flow components.

[0062] Referring to Figures 3 and 4, in some embodiments, the battery pack 1 includes two battery modules 11 connected in parallel.

[0063] In the above embodiment, the two battery modules 11 of the battery pack 1 are connected in parallel. The charging and discharging current of a single battery module 11 is half of the system current, which reduces the maximum load of the connector of a single battery module, reduces the heat generation of the battery module's terminals, reduces the pressure on the thermal management system, and alleviates the problem of difficulty in selecting high-flow components.

[0064] Referring to Figures 1 and 2, in some embodiments, the battery system further includes a high-voltage box 2, a first wiring harness 41, and a second wiring harness 42.

[0065] The high-voltage box 2 is located on the side of the battery system in the first direction X.

[0066] The first wiring harness 41 connects to the positive terminal of the high-voltage box 2 and the positive terminal of the battery pack 1 furthest from the high-voltage box 2. The second wiring harness 42 connects to the negative terminal of the high-voltage box 2 and the negative terminal of the battery pack 1 closest to the high-voltage box 2.

[0067] Alternatively, the first wiring harness 41 is connected to the positive terminal of the high-voltage box 2 and the positive terminal of the battery pack 1 closest to the high-voltage box 2. The second wiring harness 42 is connected to the negative terminal of the high-voltage box 2 and the negative terminal of the battery pack 1 furthest from the high-voltage box 2.

[0068] In the above embodiments, when the number of battery packs 1 in the battery system increases or decreases, it is only necessary to adjust the length of the wiring harness between the high voltage box 2 and the battery pack 1 furthest away from it to achieve the connection between the battery pack 1 furthest away from the high voltage box 2 and the high voltage box 2. The expansion or reduction of the battery system's capacity can be easily achieved.

[0069] In the above embodiments, the high-voltage box 2 is used to interact with external high-voltage equipment, enabling the battery system to input (such as a charging pile) and output (such as an inverter) high-voltage electrical energy, providing an energy path for high-power loads such as motor drives and fast charging interfaces.

[0070] In some embodiments, both the first wiring harness 41 and the second wiring harness 42 include at least two lines.

[0071] In the above embodiments, the connection between the positive and negative terminals of the high-voltage box 2 and the battery pack 1 is made using at least two lines. Compared with the single-line form, the wire diameter of each line in the at least two lines is reduced, which facilitates the bending arrangement in the whole machine. Furthermore, by using a multi-inlet and multi-outlet high-voltage box, multiple lines can be connected between the positive and negative terminals of the high-voltage box 2 and the battery pack 1, and a single line connection between the positive and negative terminals of the high-voltage box 2 and the battery pack 1 can also be achieved when the system current is small.

[0072] In some embodiments, both the first wiring harness 41 and the second wiring harness 42 include two lines.

[0073] In the above embodiments, the positive and negative terminals of the high-voltage box 2 are connected to the battery pack 1 using dual lines. Compared with the single-line connection, the diameter of each line in the dual-line connection is reduced, which facilitates the bending arrangement in the whole machine. Furthermore, the use of a dual-input and dual-output high-voltage box can achieve dual-line connection between the positive and negative terminals of the high-voltage box 2 and the battery pack 1, and can also achieve single-line connection between the positive and negative terminals of the high-voltage box 2 and the battery pack 1 when the system current is small.

[0074] In some embodiments, the positive terminal of the high-voltage box 2 is provided with a positive terminal connector, and the negative terminal of the high-voltage box 2 is provided with a negative terminal connector. Both the positive and negative terminal connectors are dual-core connectors. The dual-core connectors can be connected to each of the two lines one-to-one.

[0075] In some embodiments, the battery system includes a five-layer battery pack 1. Alternatively, the battery system may also include a four-layer or six-layer battery pack 1.

[0076] In some embodiments, the positive high-voltage line of the high-voltage box 2 is a dual-line, and the negative high-voltage line of the high-voltage box 2 is also a dual-line. The high-voltage box 2 is suitable for battery systems with two, three, four, five, six or more battery packs.

[0077] In some embodiments, the battery system further includes a third wiring harness 43, in which the positive terminal of one battery pack 1 is connected to the negative terminal of the other battery pack 1 via the third wiring harness 43, the third wiring harness 43 including at least two lines.

[0078] In the above embodiment, the positive and negative terminals of two adjacent battery packs 1 are connected by at least two lines. Compared with the form of using a single line connection, the wire diameter of each individual line in the at least two lines is reduced, which facilitates the bending arrangement in the whole machine.

[0079] In some embodiments, the third wiring harness 43 includes two lines.

[0080] In some embodiments, the battery pack 1 includes a high-voltage negative connector 16 and a high-voltage positive connector 17, both of which are dual-core connectors. The dual-core connectors can be connected to two lines respectively.

[0081] In some embodiments, the high-voltage negative connector 16 and the high-voltage positive connector 17 of two adjacent battery packs 1 are connected in series.

[0082] To expand the number of battery packs 1, simply disconnect the battery pack closest to the high-voltage box 2 from the high-voltage box 2, add battery pack 1, connect the battery packs 1 in series, and then connect the battery pack currently closest to the high-voltage box 2 to the high-voltage box 2. This makes it easy to expand the battery system's capacity.

[0083] Referring to Figures 3 and 4, in some embodiments, each battery pack 1 includes at least two first connectors 12, a first busbar 13, at least two MSDs 14, a second busbar 15, and a high-voltage negative connector 16.

[0084] At least two first connectors 12 are respectively connected to the negative terminals of at least two battery modules 11.

[0085] The first busbar 13 is connected to at least two first connectors 12.

[0086] At least two MSD14s are connected in parallel to the first busbar 13.

[0087] The second bus 15 is connected to at least two MSD14s respectively.

[0088] The high-voltage negative connector 16 is connected to the second busbar 15.

[0089] In the above embodiments, each battery module 11 is configured with an MSD, which allows any battery module 11 to be disconnected individually, thus preventing the entire system from losing power.

[0090] MSD (Manual Service Disconnect) is a high-voltage, high-current mechanical switch and a critical safety component in battery systems. Its main function is:

[0091] Circuit repair: When troubleshooting circuit faults, the MSD manual service switch can be used to easily disconnect the circuit, making it convenient to inspect and replace faulty components.

[0092] Safety protection: In situations where emergency circuit disconnection is required, the MSD can quickly disconnect the high-voltage circuit, protecting the safety of personnel and equipment.

[0093] Emergency Operation: When maintaining the high-voltage circuit of the vehicle, the MSD can manually disconnect the high voltage to ensure safety during the maintenance process.

[0094] The MSD has a built-in high-voltage fuse that can automatically melt and cut off the current in the event of an external short circuit, while triggering a high-voltage interlock signal to prevent the system from starting erroneously.

[0095] In multiple parallel battery modules, the MSD supports independent isolation of individual battery modules, enabling modular maintenance and redundant protection. It also manages the safe on / off state of the entire high-voltage negative circuit in collaboration with the second busbar 15 and the high-voltage negative connector 16.

[0096] In some embodiments, the first busbar 13 is disposed on one side of the battery pack 1 in the first direction X, at least two MSDs 14, the second busbar 15 and the high voltage negative connector 16 are disposed on the first side of the battery pack 1 in the third direction Z, and the negative terminals of at least two battery modules 11 are disposed on the second side of the battery pack 1 in the third direction Z, with the first side and the second side being two sides arranged opposite to each other.

[0097] In the above embodiment, the negative terminals of at least two battery modules 11 are located on the second side of the battery pack 1 in the Z direction. The negative terminals of at least two battery modules 11 are respectively connected to the first busbar 13 by a first connector. The first busbar 13 extends to the first side of the battery pack 1 in the Z direction and is connected to at least two MSDs in a one-to-one correspondence through at least two branches. The at least two MSDs are respectively connected to the second busbar 15 and connected to the high-voltage negative connector 16 through the second busbar 15. The at least two MSDs 14, the second busbar 15 and the high-voltage negative connector 16 are all located on the first side of the battery pack 1 in the Z direction. The circuit is neatly and regularly arranged, which is conducive to the expansion or reduction of the battery pack 1.

[0098] In some embodiments, the battery pack 1 further includes a fourth bus 20, which is disposed on the first side of the battery pack 1 located in the third direction Z. The first bus 13 is connected to at least two MSD14 in a one-to-one correspondence through the fourth bus 20.

[0099] The fourth bus 20 is connected to the first bus 13, and the fourth bus 20 is connected to at least two MSD14 respectively through at least two branches.

[0100] In some embodiments, each battery pack 1 includes two battery modules 11, two first connectors 12, and two MSDs 14. A first busbar 13 is disposed on one side of the battery pack 1 in the first direction X, and at the location where the two battery modules 11 are adjacent.

[0101] In the above embodiment, the negative terminals of the two battery modules 11 are respectively connected to a first connector 12. The two first connectors 12 are located on the second side of the battery pack 1 in the third direction Z. The two first connectors 12 are bent toward the side of the battery pack 1 in the first direction X and are respectively connected to a first busbar 13. The first busbar 13 is connected to a fourth busbar 20. The fourth busbar 20 is located on the first side of the battery pack 1 in the third direction Z. The fourth busbar 20 is respectively connected to two MSDs 14 in a one-to-one correspondence. The two MSDs 14 are located on the first side of the battery pack 1 in the third direction Z. The two MSDs 14 are respectively connected to a second busbar 15. The second busbar 15 is connected to a high-voltage negative connector 16. The second busbar 15 and the high-voltage negative connector 16 are both located on the first side of the battery pack 1 in the third direction Z.

[0102] In the above embodiment, the first connectors 12 of the two battery modules 11 are led to the first side of the battery pack 1 located in the third direction Z through a first busbar 13. Compared with the method of leading the battery pack 1 to the first side of the third direction Z and then merging them, the cabinet layout space is saved.

[0103] In some embodiments, each battery pack 1 further includes a high-voltage positive connector 17, which is disposed on the first side of the battery pack 1 in the third direction Z.

[0104] In the above embodiments, both the high-voltage positive connector 17 and the high-voltage negative connector 16 are located on the first side of the battery pack 1 in the Z direction. The wiring of the battery pack 1 is neat and regular, which is conducive to increasing or decreasing the number of battery packs 1 to increase or decrease the power of the battery system and meet different power configuration requirements.

[0105] In some embodiments, both the high-voltage negative connector 16 and the high-voltage positive connector 17 are connectors with at least two pins.

[0106] In the above embodiments, the high-voltage negative connector 16 and the high-voltage positive connector 17 can each connect at least two lines, and the diameter of each line can be reduced accordingly, which facilitates the bending and arrangement of the lines in the whole machine.

[0107] In some embodiments, each battery pack 1 further includes at least two second connectors 18, a third busbar 19, and a high-voltage positive connector 17.

[0108] At least two second connectors 18 are respectively connected to the positive terminals of at least two battery modules 11.

[0109] The third busbar 19 is connected to at least two second connectors 18.

[0110] The high-voltage positive connector 17 is connected to the third busbar 19.

[0111] In the above embodiment, the positive terminals of at least two battery modules 11 are respectively connected to a second connector 18, the two second connectors 18 are respectively connected to a third busbar 19, and the third busbar 19 is connected to a high-voltage positive connector 17.

[0112] In some embodiments, the battery pack 1 further includes a third connector 21, wherein a second connector 18 can be connected to a third busbar 19 via the third connector 21.

[0113] Optionally, the third bus 19 has three ends: one end is connected to the third connector 21, one end is connected to a second connector 18, and the other end is connected to the high-voltage positive connector 17.

[0114] In some embodiments, the positive terminals of at least two battery modules 11, at least two second connectors 18, a third busbar 19, and a high-voltage positive connector 17 are all located on the first side of the battery pack 1 in the third direction Z.

[0115] In the above embodiments, the relevant connection components connected to the high voltage positive electrode are all located on the first side of the battery pack 1 in the third direction Z, which facilitates wiring. The high voltage negative connector 16 is also located on the first side of the battery pack 1 in the third direction Z, which makes the wiring regular and neat, which is conducive to the expansion or reduction of the number of battery packs 1.

[0116] In some embodiments, the battery pack 1 further includes a housing 23, and each battery module 11 is disposed within the housing 23.

[0117] Referring to Figure 5, in some embodiments, the battery system further includes a cooling assembly 7, which includes a main water inlet pipe 71, a main water outlet pipe 72, at least two first branch pipes 73 and at least two second branch pipes 74.

[0118] At least two first branch pipes 73 are connected in parallel to the main water inlet pipe 71, and are respectively connected to the water inlet of at least two battery packs 1.

[0119] At least two second branch pipes 74 are connected in parallel to the main water outlet pipe 72, and are respectively connected to the water outlet of at least two battery packs 1.

[0120] In the above embodiment, the first branch pipe 73 connected to each battery pack 1 is connected in parallel, and the second branch pipe 74 connected to each battery pack 1 is connected in parallel. The pipeline layout of the cooling assembly 7 is highly versatile. When the number of battery packs 1 increases or decreases, the number of branches can be increased or decreased accordingly, so that the setting of the cooling assembly 7 can be matched and completed, which is convenient for increasing or decreasing the battery system power.

[0121] In the above embodiment, the cooling component 7 provides refrigerant through the main water inlet pipe 71. The refrigerant enters each battery pack 1 through each first branch pipe 73. The battery pack 1 is provided with a channel for the refrigerant to flow. The refrigerant flows in the channel to cool the battery pack 1 and prevent the battery pack 1 from getting too hot and causing safety hazards. After the refrigerant is cooled down in the battery pack 1, it enters the second branch pipe 74 from the water outlet of the battery pack 1. The refrigerant in each second branch pipe 74 flows into the main water outlet pipe 72 and flows out. The refrigerant circulates in this way.

[0122] In some embodiments, the cooling assembly 7 further includes a refrigerant supply device, with a main water inlet pipe 71 connected to the outlet end of the refrigerant supply device and a main water outlet pipe 72 connected to the inlet end of the refrigerant supply device.

[0123] In some embodiments, the main water inlet pipe 71, the main water outlet pipe 72, at least two first branch pipes 73 and at least two second branch pipes 74 are all located on the first side of the battery pack 1 in the direction of the third direction Z.

[0124] In the above embodiments, the pipes of the cooling component 7 are all located on the first side of the battery pack 1 in the third direction Z. The high-voltage negative connector 16 and the high-voltage positive connector 17 connected to the high-voltage box 2 are also located on the first side of the battery pack 1 in the third direction Z. The cooling pipes and high-voltage lines of the battery system are arranged on the same side of the battery pack 1. The pipe arrangement is regular and neat, which is conducive to reducing the volume of the entire battery system and to increasing or decreasing the number of battery packs in the battery system.

[0125] In some embodiments, both the main inlet pipe 71 and the main outlet pipe 72 may include multiple pipe segments, with branch lines located between two adjacent pipe segments and connected to the adjacent pipe segments and branch lines via a tee 75.

[0126] In the above embodiments, when the number of battery packs 1 increases, taking the main water outlet pipe 72 as an example, it is only necessary to add one section of the main water outlet pipe 72 and then add a branch. The added section and the adjacent section, as well as the added branch, are connected by a T-junction 75, which can achieve the cooling of the added battery pack 1. It can realize the connection of cooling pipes for battery packs with different numbers of layers, and has strong versatility.

[0127] In some embodiments, the main inlet pipe 71, the main outlet pipe 72 and the pipe section closest to the refrigerant supply equipment are provided with clamps 76. The clamps 76 are provided at the connection between the tee 75 and the pipe section to improve the connection strength.

[0128] In the above embodiments, when adding or reducing pipe sections and branches, it is necessary to remove clamp 76 and then add or reduce the pipe section closest to the refrigerant supply equipment.

[0129] Referring to Figure 6, in some embodiments, the battery system further includes a housing 5, with at least two battery packs 1 disposed inside the housing 5, and the first direction X being the height direction of the housing 5.

[0130] In the above embodiment, each battery pack 1 is stacked along the height direction inside the housing 5, and each battery pack 1 is connected in series with each other. The layout is regular, and it is convenient to operate when it is necessary to add or remove battery packs 1.

[0131] In some embodiments, the battery system further includes a connecting frame 6 disposed on the outer wall of the housing 5 and connected to at least one of the upper battery packs 1 of the at least two battery packs 1, and the connecting frame 6 is also configured to be connected to the vehicle frame.

[0132] In the above embodiment, the connecting frame 6 is disposed on the outer wall of the housing 5, and is used to connect at least one of the upper battery packs 1 of the at least two battery packs 1, and also to connect the frame of the engineering machinery, which can improve the overall strength of the battery system and reduce the vibration of the upper battery pack 1.

[0133] In some embodiments, the connecting bracket 6 connects two, three or more battery packs 1 located on the upper layer.

[0134] In some embodiments, the battery system further includes a low-voltage box 3, at least two low-voltage connectors 25, and a fourth wiring harness 8.

[0135] The low-pressure box 3 is located on the side of the battery system in the first direction X.

[0136] At least two low-voltage connectors 25 are respectively provided on at least two battery packs 1, and all low-voltage connectors 25 are located on the first side of the battery system in the third direction Z.

[0137] The fourth wiring harness 8 connects the low-voltage box 3 and at least two low-voltage connectors 25.

[0138] In the above embodiments, both the low-voltage box 3 and the high-voltage box 2 are located on the side of the battery system located in the first direction X, and the low-voltage connector 25, the high-voltage positive connector 17, and the high-voltage negative connector 16 are all located on the first side of the battery pack 1 located in the third direction Z. The high-voltage components and low-voltage components of the battery pack 1 are arranged in a regular manner and the wiring is neat, which is conducive to increasing or decreasing the number of battery packs 1.

[0139] In the above embodiments, the low-pressure box 3 is used for circuit protection and signal conduits of the battery system. For example, it is used for receiving and transmitting control signals or temperature signals.

[0140] In some embodiments, referring to FIG6, both the low-pressure box 3 and the high-pressure box 2 are located on the top of the box body 5.

[0141] Some specific embodiments of the battery system are described in detail below with reference to Figures 1 to 6.

[0142] The battery system includes multiple battery packs 1, such as the five battery packs 1 shown in Figure 1. The five battery packs 1 are housed inside a housing 5 and stacked sequentially along the height direction of the housing 5, which is the first direction X. The upper battery pack 1 is connected to the lower battery pack 1 by bolts. The high-voltage box 2 and the low-voltage box 3 are respectively fixed to the top cover plate of the housing 5 by bolts.

[0143] The battery system also includes a high-voltage wiring harness 4, which comprises a first wiring harness 41, a second wiring harness 42, and a third wiring harness 43. The first wiring harness 41 connects to the positive terminal of the high-voltage box 2 and the positive terminal of the battery pack 1 furthest from the high-voltage box 2. The second wiring harness 42 connects to the negative terminal of the high-voltage box 2 and the negative terminal of the battery pack 1 closest to the high-voltage box 2. In two adjacent battery packs 1, the positive terminal of one battery pack 1 is connected to the negative terminal of the other battery pack 1 via the third wiring harness 43, thus connecting the upper and lower battery packs in series. The first wiring harness 41, the second wiring harness 42, and the third wiring harness 43 each include two wires.

[0144] The battery system also includes a fourth wiring harness 8, which is a low-voltage wiring harness. The fourth wiring harness 8 connects the low-voltage box 3 and all battery packs 1 to realize signal transmission.

[0145] To enhance the structural stability and reliability of the battery system with multi-layer battery pack 1, a connecting frame 6 is provided on the outer wall of the housing 5. The connecting frame 6 is L-shaped and includes a vertical part and a horizontal part. Bolts pass through the vertical part of the connecting frame 6, and after passing through the side wall of the housing 5, the bolts are threaded into the connecting holes 24 provided at the bottom of the housing 23 of the battery pack 1. The horizontal part of the connecting frame 6 is connected to the frame of the construction machinery by bolts, and the connecting frame 6 provides auxiliary support for the battery system.

[0146] Each battery pack 1 includes two battery modules 11, namely a first battery module 111 and a second battery module 112. The two battery modules 11 are disposed inside the housing 23 and arranged sequentially along the second direction Y.

[0147] The first direction X is consistent with the vertical direction of the battery system, the second direction Y is consistent with the horizontal direction of the battery system, and the third direction Z is consistent with the front-back direction of the battery system.

[0148] The first battery module 111 is welded to the negative terminal post located at the rear of the first battery module 111 (the battery pack 1 is located on the second side in the third direction Z) via a first connector 12, and the first connector 12 is bent and extended to the top of the first battery module 111 (the battery module 11 is located on the side in the first direction X). The second battery module 112 is welded to the negative terminal post located at the rear of the second battery module 112 via another first connector 12, and the other first connector 12 is bent and extended to the top of the second battery module 112. The two first connectors 12 are connected in parallel to the first busbar 13. Optionally, the first busbar 13 is connected to the two first connectors 12 by bolts. The first busbar 13 extends from the rear of the battery pack 1 to the front of the battery pack 1. The first busbar 13 is then bolted to the fourth busbar 20. The fourth busbar 20 is connected to the corresponding holes of the two MSD14s via two branches. The two MSD14s are then connected to the second busbar 15s, which are connected to the high-voltage negative connector 16. The fourth busbar 20, the two MSD14s, the second busbar 15, and the high-voltage negative connector 16 are all located at the front of the battery pack 1 (the battery pack 1 is located on the first side of the Z-direction).

[0149] Optionally, both first connectors 12 can be made of soft aluminum busbars, and the first busbar 13, the fourth busbar 20 and the second busbar 15 can be made of copper busbars.

[0150] The first battery module 111 is welded to the positive terminal post disposed at the front of the first battery module 111 via a second connector 18, the second connector 18 being bent and extending at the front of the first battery module 111. The second battery module 112 is welded to the positive terminal post disposed at the front of the second battery module 112 via another second connector 18, the other second connector 18 being bent and extending at the front of the second battery module 112.

[0151] The second connector 18 of the first battery module 111 is connected to the third connector 21 by bolts. The first end of the third busbar 19 is connected to the third connector 21 by bolts. The second end of the third connector 21 is connected to the second connector 18 of the second battery module 112 by bolts. The third end of the third busbar 19 is connected to the high-voltage positive connector 17. This allows the current from the first battery module 111 and the second battery module 112 to be combined and output to the high-voltage positive connector 17.

[0152] The third connector 21, the third busbar 19, and the high-voltage positive connector 17 are all located at the front of the battery pack 1.

[0153] Optionally, both the third busbar 19 and the third connector 21 are made of copper busbars. The second connector 18 is made of copper-aluminum composite busbar.

[0154] Referring to Figure 2, each layer of battery pack 1 has two high-voltage wires connected to its high-voltage negative connector 16 and high-voltage positive connector 17. The negative terminal of the next layer of battery pack 1 is connected to the positive terminal of the previous layer of battery pack 1 through a pair of high-voltage wires, thus realizing the series connection of the upper and lower layers of battery pack 1. The high-voltage positive wire of the bottom layer of battery pack 1 and the high-voltage negative wire of the top layer of battery pack 1 are respectively connected to the corresponding high-voltage positive connector 17 and high-voltage negative connector 16 on the high-voltage box 2. By adding or removing a pair of inter-layer series high-voltage wires in the five-layer battery pack 1, the corresponding six-layer or four-layer series dual-branch battery system can be realized.

[0155] Referring to Figure 5, the battery system also includes a cooling assembly 7, which includes a main water inlet pipe 71 and a main water outlet pipe 72. The main water inlet pipe 71 and the main water outlet pipe 72 extend from the bottom to the top of the battery system, respectively. The water inlet and outlet pipes corresponding to the main machine are connected by the top clamp. The main water inlet pipe 71 and the main water outlet pipe 72 adopt a parallel connection scheme for the five-layer battery pack 1. The corresponding six-layer or four-layer parallel pipeline system can be achieved by adding or removing a pair of horizontal branch pipes, a pair of tees and a pair of vertical pipe sections.

[0156] According to the descriptions of the above embodiments, the battery system includes multi-layer battery packs. The positive and negative high-voltage connectors of each battery pack are connected to two high-voltage lines, and the multi-layer battery packs form a dual-branch battery system. The positive and negative terminals of adjacent battery packs are connected in series via high-voltage lines. The positive and negative high-voltage lines of the bottom and top battery packs are respectively connected to a high-voltage box. The thermal management pipelines between battery packs are connected in parallel. Only by adding inter-layer series high-voltage lines, inter-layer tees, and water pipes is needed to achieve electrical and thermal management connection schemes for different layers. The high-voltage box adopts a dual-branch scheme with two incoming and outgoing lines, which can match battery systems with different numbers of battery packs (including even or odd numbers of layers). The power battery system uses a dual-branch system, with each branch sharing half of the charging current.

[0157] The electrical high-voltage wiring harness and thermal management piping of the battery system provided in this disclosure are all modularly configured, facilitating the matching of electrical and piping solutions through modular design. This dual-branch battery system can be configured into different power platforms by matching different numbers of layers, meeting the performance requirements of various configurations of engineering machinery main products.

[0158] Some embodiments of this disclosure also provide an engineering machine that includes the battery system described above.

[0159] Based on the embodiments disclosed above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0160] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A battery system, comprising: At least two battery packs (1) are arranged sequentially along a first direction (X) and connected in series. Each battery pack (1) includes at least two battery modules (11), which are arranged sequentially along a second direction (Y) and connected in parallel.

2. The battery system according to claim 1, further comprising: A high-voltage box (2) is located on the side of the battery system in the first direction (X); The first wiring harness (41) connects the positive terminal of the high-voltage box (2) to the positive terminal of the battery pack (1) furthest from or closest to the high-voltage box (2); and The second wiring harness (42) is connected to the negative terminal of the high voltage box (2) and the negative terminal of the battery pack (1) that is closest to or furthest from the high voltage box (2).

3. The battery system according to claim 2, wherein both the first wiring harness (41) and the second wiring harness (42) include at least two wires.

4. The battery system according to any one of claims 1 to 3 further includes a third wiring harness (43), wherein the positive terminal of one of the two adjacent battery packs (1) is connected to the negative terminal of the other battery pack (1) via the third wiring harness (43), the third wiring harness (43) comprising at least two lines.

5. The battery system according to any one of claims 1 to 4, wherein each of the battery packs (1) comprises: At least two first connectors (12) are respectively connected to the negative terminals of the at least two battery modules (11); The first busbar (13) is connected to the at least two first connectors (12) respectively; At least two MSDs (14) are connected in parallel to the first busbar (13); The second busbar (15) is connected to the at least two MSDs (14) respectively; as well as The high-voltage negative connector (16) is connected to the second busbar (15).

6. The battery system according to claim 5, wherein the first busbar (13) is disposed on one side of the battery pack (1) in the first direction (X), the at least two MSDs (14), the second busbar (15) and the high voltage negative connector (16) are disposed on the first side of the battery pack (1) in the third direction (Z), and the negative terminals of the at least two battery modules (11) are disposed on the second side of the battery pack (1) in the third direction (Z), wherein the first side and the second side are opposite sides.

7. The battery system according to claim 6, wherein each of the battery packs (1) includes two battery modules (11), and the first busbar (13) is disposed on one side of the battery pack (1) in the first direction (X) and at the adjacent position of the two battery modules (11).

8. The battery system according to claim 6 or 7, wherein each of the battery packs (1) further includes a high-voltage positive connector (17) disposed on the first side of the battery pack (1) in the third direction (Z).

9. The battery system according to claim 8, wherein the high-voltage negative connector (16) and the high-voltage positive connector (17) are both connectors having at least two cores.

10. The battery system according to any one of claims 1 to 9, wherein each of the battery packs (1) comprises: At least two second connectors (18) are respectively connected to the positive terminals of the at least two battery modules (11); The third busbar (19) is connected to the at least two second connectors (18); and A high-voltage positive connector (17) is connected to the third busbar (19).

11. The battery system according to claim 10, wherein the positive terminals of the at least two battery modules (11), the at least two second connectors (18), the third busbar (19) and the high-voltage positive connector (17) are all disposed on the first side of the battery pack (1) in the third direction (Z).

12. The battery system according to any one of claims 1 to 11, further comprising: Main water inlet pipe (71); Main outlet pipe (72); At least two first branch pipes (73) are connected in parallel to the main water inlet pipe (71), and are respectively connected to the water inlet ends of the at least two battery packs (1); and At least two second branch pipes (74) are connected in parallel to the main water outlet pipe (72) and are respectively connected to the water outlet of the at least two battery packs (1).

13. The battery system according to claim 12, wherein the main water inlet pipe (71), the main water outlet pipe (72), the at least two first branch pipes (73) and the at least two second branch pipes (74) are all located on the first side of the battery pack (1) in the third direction (Z).

14. The battery system according to any one of claims 1 to 13 further includes a housing (5), wherein the at least two battery packs (1) are disposed within the housing (5), and the first direction (X) is the height direction of the housing (5).

15. The battery system according to claim 14, further comprising a connecting frame (6) disposed on the outer wall of the housing (5) and connected to at least one of the at least two battery packs (1) located on the upper layer, the connecting frame (6) being further configured to be connected to the vehicle frame.

16. The battery system according to any one of claims 1 to 15, further comprising: A low-pressure box (3) is provided on the side of the battery system located in the first direction (X); At least two low-voltage connectors (25) are respectively provided on the at least two battery packs (1) and located on the first side of the battery system in the third direction (Z); as well as The fourth wiring harness (8) connects the low-voltage box (3) and the at least two low-voltage connectors (25).

17. An engineering machine comprising a battery system according to any one of claims 1 to 16.

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