Integrated liquid-cooled battery module, battery system and electric device

Abstract

This utility model discloses an integrated liquid-cooled battery module, battery system, and electrical equipment. The battery module includes a battery pack, which comprises at least two rows of battery cells spaced apart along a first direction. A cooling plate assembly includes a base plate and an intermediate cooling plate. The battery pack is mounted on the base plate, and the intermediate cooling plate is perpendicularly mounted on the base plate along a third direction, with the intermediate cooling plate contacting between adjacent rows of battery cells. Both ends of the intermediate cooling plate and the base plate along a second direction have liquid inlets connecting to internal liquid channels. An end plate assembly includes two end plates along the second direction at both ends of the battery pack and the cooling plate assembly. Each end plate has a liquid inlet and a connector, with the liquid inlet and connector connecting to the corresponding liquid inlet and connector for connecting to external coolant. The first, second, and third directions are mutually perpendicular, and the first and second directions are on the same horizontal plane. This design not only provides good heat dissipation but also features a simple piping structure, small footprint, and prevents coolant leakage.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to integrated liquid-cooled battery modules, battery systems, and electrical equipment. Background Technology

[0002] The dual pressures of environmental protection and energy conservation have propelled the electrification of construction machinery into a phase of rapid development. As a core component of electric construction machinery, the performance of the power battery directly impacts its operational status. During operation, the battery undergoes vigorous chemical reactions to provide electrical energy, generating significant heat during charging and discharging, leading to a rise in battery temperature. This temperature directly affects the battery's safety, charge / discharge capacity, cycle life, and other performance characteristics. To ensure the battery operates at its optimal temperature, cooling is essential. Currently, liquid cooling is the primary method for power batteries. A common approach involves placing a liquid cooling plate on the top, bottom, or side of the battery and in contact with it. Heat exchange occurs through the flow of coolant within the plate, removing heat from the battery under high-temperature conditions and ensuring optimal operating temperature, thereby reducing potential safety hazards. However, this structure only achieves single-sided water cooling, resulting in relatively poor heat dissipation.

[0003] In related technologies, liquid-cooled battery modules include a T-shaped liquid cooling plate and two rows of battery cells. The T-shaped liquid cooling plate includes a base plate and a middle vertical plate. The middle vertical plate is vertically mounted on the base plate, and the two rows of battery cells are mounted on the base plate, located on either side of the middle vertical plate. Both rows of battery cells abut against the sides of the middle vertical plate. Both the base plate and the middle vertical plate are provided with liquid channels and inlets and outlets connecting the liquid channels. Liquid can enter through the inlets and exit through the outlets to quickly remove heat from the battery cells. This T-shaped liquid cooling plate of the liquid-cooled battery module not only achieves a cooling effect at the bottom but also achieves dual-sided cooling of the battery cells on the middle vertical plate, which greatly improves the cooling effect of the battery cells.

[0004] However, the aforementioned liquid-cooled battery module requires multiple connection interfaces (flanges, quick-connect fittings, welding / brazing / sealing ring connection points, etc.) and support structures between the base plate, the vertical plate, and the external pipelines for assembly. This not only results in a complex structure and a large space occupation, affecting the energy density of the battery module, but also makes the interface points weak points. During transportation, installation, and operation, these points are prone to deformation, cracking, or even breakage, leading to coolant leakage and thus affecting the service life of the liquid-cooled battery module. Utility Model Content

[0005] The purpose of this utility model is to disclose an integrated liquid-cooled battery module, battery system, and electrical equipment. The integrated liquid-cooled battery module not only has a good heat dissipation effect, but also has a simple pipeline structure and occupies little space, which is conducive to improving the energy density of the battery module. At the same time, it can avoid coolant leakage, so as to ensure the service life of the integrated liquid-cooled battery module, thereby ensuring the normal use of the battery system and electrical equipment.

[0006] To achieve the above objectives, the first aspect of this utility model discloses an integrated liquid-cooled battery module, comprising: The battery pack includes at least two rows of battery cells spaced apart along a first direction. The cold plate assembly includes a base plate and an intermediate cold plate. The battery pack is placed on the base plate, and the intermediate cold plate is placed vertically on the base plate along a third direction. The intermediate cold plate is in contact between two adjacent rows of battery cells. Both ends of the intermediate cold plate and the base plate along the second direction are provided with liquid inlets that connect to the liquid channels inside. The end plate assembly includes two end plates located at both ends of the battery pack and the cold plate assembly along the second direction. The end plates are provided with liquid passage chambers and connectors. The liquid passage ports and connectors are connected to the corresponding liquid passage chambers, and the connectors are used to connect to external coolant. The first direction, the second direction, and the third direction are perpendicular to each other, and the first direction and the second direction are located on the same horizontal plane.

[0007] As an optional implementation, the end plate includes an end plate body and a sealing plate. The end plate body is located at the end of the battery pack and the cold plate group in the second direction. The side of the end plate body facing away from the battery pack has a groove. The sealing plate seals the groove opening to form a liquid passage cavity. The connector is fixed to the end plate body and connected to the liquid passage cavity.

[0008] As an optional implementation, the cold plate assembly also includes two side cold plates, both of which are perpendicularly disposed on the base plate along a third direction, and the two side cold plates are respectively in contact with the opposite ends of the battery pack along the first direction. Both ends of the two side cold plates along the second direction are provided with liquid inlets that connect to the liquid channels inside them, and the liquid inlets of the side cold plates connect to their corresponding liquid inlets.

[0009] As an optional implementation, the bottom plate is provided with a first liquid outlet at both ends in the second direction, the middle cold plate is provided with a second liquid outlet at both ends in the second direction, and the side cold plate is provided with a third liquid outlet at both ends in the second direction. The end plate is provided with a through hole corresponding to the first liquid outlet, the second liquid outlet and the third liquid outlet to connect to the liquid cavity. The first liquid outlet, the second liquid outlet and the third liquid outlet are sealed through the corresponding through hole to connect to the liquid cavity.

[0010] As an optional implementation, a first liquid channel is provided in the base plate, a second liquid channel is provided in the middle cold plate, and a third liquid channel is provided in the side cold plate. The first liquid channel, the second liquid channel, and the third liquid channel are arranged in a straight line or a wave shape along the second direction, and both ends of the second direction are connected to the corresponding liquid outlet.

[0011] As an optional implementation, the second and third liquid outlets are set at the same height as their corresponding liquid passage chambers in the third direction, and the first liquid outlet is inserted from the bottom and communicates with its corresponding liquid passage chamber, and the two first liquid outlets are staggered in the first direction.

[0012] As an optional implementation, an insulating plate is provided between the battery pack and the end plate assembly and the two side cold plates, and the insulating plate includes a heat-conducting structure.

[0013] As an optional implementation, side plates are provided on opposite sides of the two side cold plates, and the two ends of the side plates in the second direction are fixedly connected to the corresponding end plates.

[0014] The second aspect of this utility model discloses a battery system, including at least one of the above-described integrated liquid-cooled battery modules.

[0015] The third aspect of this utility model discloses an electrical device, comprising: at least one of the above-described battery systems.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The cold plate assembly of this invention is connected to the external coolant through a liquid passage cavity on the end plate and a connector. The liquid passage cavity ensures that the liquid passages of both the intermediate cold plate and the bottom plate can be stably connected to the coolant, and reduces the number of connectors. This not only simplifies the structure of the cooling pipes and reduces space occupation, which is beneficial to improving the energy density of the battery module, but also reduces the number of connectors and connection structures, which helps to improve the connection strength of the connectors. During transportation, installation and operation, it is not easy to deform, crack or even break, thus avoiding coolant leakage and ensuring the service life of the integrated liquid-cooled battery module without affecting the heat dissipation effect, thereby ensuring the normal use of the battery system and electrical equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the integrated liquid-cooled battery module of this utility model; Figure 2 This is an exploded view of the integrated liquid-cooled battery module of this utility model; Figure 3 This is a structural schematic diagram of the cold plate assembly, end plate assembly, and side plate of this utility model; Figure 4 This is an assembly diagram of the cold plate assembly and end plate assembly of this utility model; Figure 5 This is a structural schematic diagram of the cold plate assembly and end plate assembly of this utility model; Figure 6 This is a top view of the cold plate assembly of this utility model; Figure 7 yes Figure 6 A cross-sectional view of the middle structure along section line EE; Figure 8 yes Figure 6 A cross-sectional view of the middle structure along section FF.

[0019] Explanation of key figure labels: 1. Battery pack; 11. Cell pack; 111. Cell; 2. Cold plate pack; 21. Base plate; 211. First liquid inlet; 212. First liquid channel; 22. Intermediate cold plate; 221. Second liquid inlet; 222. Second liquid channel; 23. Side cold plate; 231. Third liquid inlet; 232. Third liquid channel; 3. End plate pack; 31. End plate; 311. Liquid inlet cavity; 312. Connector; 313. End plate body; 314. Sealing plate; 315. Through hole; 4. Insulating plate; 5. Side plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0026] Please see Figure 1-2 As shown, this application embodiment provides an integrated liquid-cooled battery module, including a battery pack 1. The battery pack 1 includes at least two rows of cell groups 11 spaced apart along a first direction, and each row of cell groups 11 includes a plurality of cells 111 arranged along a second direction. The first direction is as follows: Figure 1 The X direction is shown, and the second direction is as follows. Figure 1 As shown in the Y direction, the first direction is perpendicular to the second direction and lies on the same horizontal plane. In the second direction, multiple battery cells 111 are stacked. The battery cells 111 can be square, cylindrical, etc. This embodiment uses a square battery cell as an example. The two opposite sides of the square battery cell along the second direction are its two large faces. The corresponding large faces of two adjacent square battery cells are arranged adjacently, and they are stacked sequentially to form a row of battery cell groups 11 in the second direction. The battery cell groups 11 can be arranged in two, three, or four rows along the first direction. The number of battery cell groups 11 depends on the performance requirements of the battery module. This embodiment uses a two-row battery cell group 11 as an example.

[0027] Battery pack 1 generates a significant amount of heat during operation, causing its temperature to rise. To ensure the safety, charge / discharge capacity, and cycle life of battery pack 1, cooling is necessary. Therefore, liquid cooling structures are installed between adjacent rows of cells 11 and at the bottom of battery pack 1. Figure 4 The liquid cooling structure includes a cold plate assembly 2, which includes a base plate 21 and an intermediate cold plate 22. The battery pack 1 is mounted on the base plate 21, and the intermediate cold plate 22 is perpendicularly mounted on the base plate 21 along a third direction. The intermediate cold plate 22 is positioned between two adjacent rows of battery cells 11. Both ends of the intermediate cold plate 22 and the base plate 21 along the second direction have liquid inlets that connect to the internal liquid channels. The third direction is as follows... Figure 1 As shown in the Z direction, the third direction is perpendicular to both the first and second directions. The intermediate cold plate 22 is vertically mounted on the base plate 21 along the third direction using welding, bolts, rivets, or other methods. The number of intermediate cold plates 22 depends on the number of cell groups 11. If there are two rows of cell groups 11, there is one intermediate cold plate 22; if there are three rows, there are two intermediate cold plates 22, and so on. The two opposite sides of the intermediate cold plate 22 along the first direction contact the corresponding sides of the two rows of cell groups 11 to cool the corresponding sides of the cell groups 11. The base plate 21 is located at the bottom of the battery pack 1, and its top surface along the third direction contacts the bottom surface of the battery pack 1 to cool the bottom surface of the battery pack 1. Thus, the cold plate group 2 allows for simultaneous cooling of the bottom and sides of the cell groups 11, and one intermediate cold plate 22 can cool the sides of two rows of cell groups 11, resulting in good heat dissipation and a smaller space occupation by the cold plate group 2.

[0028] The cooling effect of the cold plate assembly 2 is achieved through the circulation of coolant. Liquid channels are provided within the base plate 21 and the intermediate cold plate 22, extending along a second direction. Both ends of the liquid channels in the second direction have inlets for coolant inflow and outflow, respectively. Coolant inflow and outflow are achieved through the end plate assembly 3. The end plate assembly 3 includes two end plates 31 located at both ends of the battery pack 1 and the cold plate assembly 2 along the second direction. Each end plate 31 has a liquid passage chamber 311 and a connector 312. Both the inlet and connector 312 are connected to the corresponding liquid passage chamber 311, and the connector 312 is used to connect to external coolant. The two end plates 31 can limit and fix the battery pack 1 and the cold plate assembly 2 in the second direction. Furthermore, the liquid passage chamber 311 of the end plate 31 is a sealed chamber that can temporarily store coolant and allow coolant to flow through. The liquid passage port and the connector 312 are connected through the liquid passage chamber 311, and the connector 312 is connected to the external coolant. Thus, the external coolant can flow into the liquid passage chamber 311 through the connector 312 of one end plate 31, and then flow into the liquid channels of the intermediate cold plate 22 and the bottom plate 21 through each liquid passage port, so that the coolant flows in the second direction in the liquid channel, thereby cooling the bottom and sides of the cell assembly 11. Then, it flows out through the liquid passage port at the other end of the second direction, and flows out through the liquid passage chamber 311 and the connector 312 of the other end plate 31 to the external coolant for cooling treatment, so as to achieve the purpose of cooling the battery assembly 1 by circulating the coolant.

[0029] Based on this, in this embodiment, the cold plate assembly 2 is connected to the external coolant through the liquid passage 311 of the end plate 31 and a connector 312. The liquid passage 311 ensures that the liquid passages of the intermediate cold plate 22 and the bottom plate 21 can be stably connected to the coolant, and reduces the number of connectors 312. This not only simplifies the structure of the cooling pipes and occupies less space, which is beneficial to improving the energy density of the battery module, but also reduces the number of connectors and connection structures, which is beneficial to improving the connection strength of the connectors. During transportation, installation, and operation, deformation, cracking, or even breakage is less likely to occur, thus avoiding coolant leakage and ensuring the service life of the integrated liquid-cooled battery module without affecting the heat dissipation effect.

[0030] See Figure 2-4 The end plate 31 includes an end plate body 313 and a sealing plate 314. The end plate body 313 is located at the end of the battery pack 1 and the cold plate group 2 in the second direction. The side of the end plate body 313 facing away from the battery pack 1 has a groove. The sealing plate 314 seals the groove opening to form a liquid passage cavity 311. The connector 312 is fixed to the end plate body 313 and connected to the liquid passage cavity 311. The two end plate bodies 313 are located at both ends of the battery pack 1 and the cold plate group 2 in the second direction, which can limit and fix the battery pack 1 and the cold plate group 2 in the second direction. The groove is formed in the end plate body 313. The size of the groove is determined according to the coolant requirements of the cold plate group 2. The size of the sealing plate 314 is adapted to or larger than the size of the groove opening, so as to seal the groove opening through structures such as adhesive, screws, and welding, thereby forming a liquid passage cavity 311 in the groove. The connector 312 is fixed to the end plate body 313 by means of bonding, welding or other methods. The groove wall of the groove is provided with a through hole corresponding to the connector 312. One end of the connector 312 is connected to the liquid chamber 311 through the through hole, and the other end of the connector 312 is connected to the external coolant through the pipeline. This allows the coolant to flow into the cold plate group 2, or the coolant flowing out of the cold plate group 2 to return to the external coolant for cooling treatment, so as to achieve a good heat dissipation effect, simplify the connection structure, improve space utilization and avoid coolant leakage.

[0031] Based on the above structure, see [link / reference] Figure 1-4The cold plate assembly 2 also includes two side cold plates 23. Both side cold plates 23 are vertically mounted on the base plate 21 along a third direction, and are respectively positioned at opposite ends of the battery pack 1 along a first direction. Each end of the two side cold plates 23 along a second direction has a liquid inlet connecting to its internal liquid channel, and the liquid inlet of the side cold plate 23 connects to its corresponding liquid inlet cavity 311. The two side cold plates 23 are vertically mounted on the base plate 21 along a third direction by welding, bolts, rivets, etc. Specifically, at the two ends of the base plate 21 along the first direction, the opposite sides of the two side cold plates 23 along the first direction are in contact with the corresponding sides of their respective cell groups 11. This, in conjunction with the intermediate cold plate 22, allows cooling of both opposite sides of each row of cell groups 11 along the first direction. Combined with the cooling effect of the base plate 21 on the bottom surface of the cell groups 11, the battery pack 1 has a good heat dissipation effect.

[0032] Two end plates 31 are located at both ends of the cold plate assembly 2 in the second direction. The two ends of the two end plates 31 in the first direction are corresponding to the two side cold plates 23. Not only can the two end plates 31 be used to limit and fix the two side cold plates 23 in the second direction, but the liquid passage of the side cold plates 23 is also connected to the external coolant through the liquid passage cavity 311 and the connector 312 on the corresponding end plate 31. This simplifies the structure of the cooling pipeline, which is conducive to improving the space utilization and energy density of the battery module and avoiding coolant leakage, so as to ensure the service life of the integrated liquid-cooled battery module.

[0033] Combination Figure 5 The bottom plate 21 has a first liquid outlet 211 at both ends in the second direction, the intermediate cold plate 22 has a second liquid outlet 221 at both ends in the second direction, and the side cold plate 23 has a third liquid outlet 231 at both ends in the second direction. The end plate 31 is fitted with a through hole 315 corresponding to the first liquid outlet 211, the second liquid outlet 221, and the third liquid outlet 231 to connect to the liquid cavity 311. The first liquid outlet 211, the second liquid outlet 221, and the third liquid outlet 231 are sealed through the corresponding through hole 315 to connect to the liquid cavity 311. The first liquid outlet 211, the second liquid outlet 221, and the third liquid outlet 231 extend from the ends of the bottom plate 21, the intermediate cold plate 22, and the side cold plate 23 in the second direction toward the end plate body 313, and are press-fitted with the corresponding through hole to achieve the flow of coolant while ensuring sealing. The base plate 21, the intermediate cold plate 22 and the side cold plate 23 are sealed and fixed to the end plate bodies 313 at both ends in the second direction, which is convenient for assembly and will not affect the structural stability.

[0034] The second liquid outlet 221 and the third liquid outlet 231 are positioned at the same height as their corresponding liquid passage 311 in the third direction. The first liquid outlet 211 extends from the bottom and communicates with its corresponding liquid passage 311, and the two first liquid outlets 211 are staggered in the first direction. Since the intermediate cold plate 22 and the side cold plate 23 are perpendicular to the bottom plate 21 in the third direction, the contact area between the intermediate cold plate 22 and the side cold plate 23 and the end plate 31 in the first direction is small. To facilitate the assembly between the intermediate cold plate 22 and the side cold plate 23, the second liquid outlet 221 and the third liquid outlet 231 are directly positioned at the height of the liquid passage 311 in the third direction for direct sealing and interference fit connection. The bottom plate 21 is located at the bottom of the end plate 31. In the third direction, the liquid passage 311 is located above the bottom plate 21. Therefore, the first liquid outlet 211 is located below the end plate 31 and is sealed upwards with an interference fit connection to achieve communication with the liquid passage 311. Furthermore, since the base plate 21 has a large extension area in the first direction, the staggered arrangement of the two first liquid inlets 211 in the first direction is conducive to improving the uniform flow of coolant in the liquid channel inside the base plate 21, thereby improving the heat dissipation effect.

[0035] In this embodiment, the end plate assembly 3 and the cold plate assembly 2 are integrated, allowing the end plate assembly 3 to serve both as a limiting and fixing structure for the cold plate assembly 2 and the battery pack 1 in the second direction, and to enhance the overall rigidity and mechanical strength of the connection, effectively resisting external forces, vibrations, and internal pressures, thereby protecting the liquid channels inside the cold plate assembly 2 and the battery cell 111. Furthermore, this integrated structure reduces stress concentration points caused by differences in the thermal expansion coefficients of different materials or components, lowering the risk of thermal cycling seal failure. Simultaneously, this integrated structure is compact, has high space utilization, and is beneficial for improving the energy density of the battery module.

[0036] See Figure 6-8 The base plate 21 is provided with a first liquid channel 212, the middle cold plate 22 is provided with a second liquid channel 222, and the side cold plate 23 is provided with a third liquid channel 232. The first liquid channel 212, the second liquid channel 222 and the third liquid channel 232 are arranged in a straight line or wavy shape along the second direction, and both ends of the second direction are connected to the corresponding liquid outlet.

[0037] Since the base plate 21 and side cooling plate 23 only cool one side of the cell assembly 11, in this embodiment, the first liquid channel 212 and the third liquid channel 232 are arranged in a straight line along the second direction. Multiple first liquid channels 212 and multiple third liquid channels 232 are arranged side-by-side along the first direction to improve the uniformity of coolant flow and enhance heat dissipation. Both the multiple first liquid channels 212 and the multiple third liquid channels 232 can be formed by providing multiple partitions extending along the second direction within the base plate 21 and side cooling plate 23 along the first direction.

[0038] The intermediate cold plate 22 cools the sides of the corresponding battery cell assembly 11 on both opposite sides along the first direction. The second liquid channel 222 is bent vertically in the third direction and extends along the second direction, so that the coolant flows vertically and horizontally along the second direction after entering the second liquid channel 222 from the second liquid inlet 221, which helps to further improve the heat dissipation effect. The intermediate cold plate 22 has an upper partition and a lower partition arranged alternately along the second direction. The bottom of the upper partition is spaced apart from the inner bottom wall of the intermediate cold plate 22, and the top of the lower partition is spaced apart from the inner top wall of the intermediate cold plate 22, so as to form a wave-shaped second liquid channel 222 extending along the second direction.

[0039] In addition to the above structure, see [link / reference] Figure 2 An insulating plate 4 is provided between the battery pack 1 and the end plate assembly 3 and the two side cooling plates 23. The insulating plate 4 includes a thermally conductive structure. The insulating plate 4 may be provided with thermally conductive adhesive, thermally conductive film, or the insulating plate 4 itself may be a thermally conductive insulating plate to improve the heat exchange effect between the side cooling plates 23 and the battery pack 1, thereby improving the heat dissipation effect of the battery pack 1. The bottom of the insulating plate 4 can be bent towards each other to at least partially cover the bottom of the battery pack 1, thereby improving the heat exchange effect between the battery pack 1 and the bottom plate 21, thereby further improving the heat dissipation effect of the battery pack 1.

[0040] Combination Figure 1 and Figure 3 Each of the two opposing sides of the side cooling plates 23 has a side plate 5, and the two ends of the side plate 5 in the second direction are fixedly connected to the corresponding end plate 31. The two ends of the two side plates 5 in the second direction are bent towards each other to partially cover the end of the end plate 31 in the first direction. The side plates 5 and the end plate 31 are fixedly connected by welding, bolts, etc. The third liquid passage of the side cooling plate 23 passes through the side plate 5 and is connected to the liquid cavity 311 through the through hole 315. The side plates 5 and the end plate assembly 3 work together to improve the structural strength of the battery module.

[0041] This application also provides a battery system including at least one of the above-described integrated liquid-cooled battery modules. When two or more integrated liquid-cooled battery modules are provided, they are connected in series and parallel to form a battery system.

[0042] This application also provides an electrical device including at least one of the above-described battery systems. When two or more battery systems are provided, they are connected in series and parallel to supply power to the electrical device. The electrical device can be an electric excavator, an electric forklift, an electric vehicle, etc.

[0043] The integrated liquid-cooled battery module of this application not only simplifies the structure of the cooling pipeline and occupies less space, which is conducive to improving the energy density of the battery module, but also has fewer connectors and fewer connection structures, which is conducive to improving the connection strength of the connectors. It is not easy to deform, crack or even break during transportation, installation and operation, thus avoiding coolant leakage and ensuring the service life of the integrated liquid-cooled battery module. It does not affect the heat dissipation effect, ensuring that the battery pack 1 is in the optimal operating temperature range to improve its charging rate. It can also prevent the spread of thermal runaway, thereby ensuring the normal use and safety of the battery system and electrical equipment.

[0044] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. An integrated liquid-cooled battery module, comprising: include: The battery pack includes at least two rows of battery cells spaced apart along a first direction; The cold plate assembly includes a base plate and an intermediate cold plate. The battery pack is disposed on the base plate, and the intermediate cold plate is disposed perpendicularly on the base plate along a third direction. The intermediate cold plate is in contact between two adjacent rows of battery packs. Both ends of the intermediate cold plate and the base plate along the second direction are provided with liquid inlets that communicate with the internal liquid channels. An end plate assembly includes two end plates disposed at both ends of the battery pack and the cold plate assembly along a second direction. Each end plate is provided with a liquid passage cavity and a connector. The liquid passage port and the connector are both connected to the corresponding liquid passage cavity, and the connector is used to connect to external coolant. The first direction, the second direction, and the third direction are perpendicular to each other, and the first direction and the second direction are located on the same horizontal plane.

2. The integrated liquid-cooled battery module according to claim 1, characterized in that: The end plate includes an end plate body and a sealing plate. The end plate body is located at the end of the battery pack and the cold plate group in the second direction. The end plate body has a groove on the side facing away from the battery pack. The sealing plate seals the groove opening to form the liquid passage cavity. The connector is fixed to the end plate body and communicates with the liquid passage cavity.

3. The integrated liquid-cooled battery module according to claim 1 or 2, characterized in that: The cold plate assembly also includes two side cold plates, both of which are perpendicularly disposed on the base plate along a third direction, and the two side cold plates are respectively in contact with the opposite ends of the battery pack along the first direction. Both ends of the two side cold plates along the second direction are provided with liquid inlets that connect to the liquid channels inside them, and the liquid inlets of the side cold plates connect to their corresponding liquid inlets.

4. The integrated liquid-cooled battery module according to claim 3, characterized in that: The bottom plate is provided with a first liquid outlet at both ends in the second direction, the intermediate cold plate is provided with a second liquid outlet at both ends in the second direction, and the side cold plate is provided with a third liquid outlet at both ends in the second direction. The end plate is provided with a through hole corresponding to the first liquid outlet, the second liquid outlet and the third liquid outlet to communicate with the liquid passage cavity. The first liquid outlet, the second liquid outlet and the third liquid outlet are sealed through the corresponding through hole to communicate with the liquid passage cavity.

5. The integrated liquid-cooled battery module according to claim 3, characterized in that: The base plate is provided with a first liquid channel, the intermediate cold plate is provided with a second liquid channel, and the side cold plate is provided with a third liquid channel. The first liquid channel, the second liquid channel, and the third liquid channel are arranged in a straight line or a wavy shape along the second direction, and both ends of the second direction are connected to the corresponding liquid inlet.

6. The integrated liquid-cooled battery module according to claim 4, characterized in that: The second and third liquid outlets are at the same height as their corresponding liquid passage chambers in the third direction. The first liquid outlet extends from the bottom and communicates with its corresponding liquid passage chamber. The two first liquid outlets are staggered in the first direction.

7. The integrated liquid-cooled battery module according to claim 3, characterized in that: An insulating plate is provided between the battery pack and the end plate assembly and the two side cold plates, and the insulating plate includes a heat-conducting structure.

8. The integrated liquid-cooled battery module according to claim 3, characterized in that: The two side cold plates are provided with side plates on opposite sides, and the two ends of the side plates in the second direction are fixedly connected to the corresponding end plates.

9. A battery system, characterized in that, include: At least one integrated liquid-cooled battery module as described in any one of claims 1-8.

10. An electrical appliance, characterized in that, include: At least one battery system as described in claim 9.

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