Battery pack

Abstract

The utility model discloses a battery pack which comprises a box body, the box body is provided with a liquid inlet, a liquid outlet and a containing cavity, the liquid inlet and the liquid outlet are both communicated with the containing cavity, and the liquid inlet and the liquid outlet are located at the two ends of the box body in the first direction; the module assembly is located in the containing cavity and extends in the first direction; the partition plate is located in the containing cavity, the two ends, in the second direction, of the partition plate abut against the cavity wall of the containing cavity, the partition plate is provided with an assembly hole allowing the module assembly to penetrate through, and the first direction is perpendicular to the second direction. According to the battery pack disclosed by the utility model, the flowing path of the cooling liquid in the accommodating cavity is limited, so that poor local heat exchange of the module assembly is effectively avoided, and the heat exchange efficiency is improved, so that a better cooling effect of the battery pack is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] Common battery thermal management cooling technologies include air cooling, liquid cooling, and direct cooling. As the market demand for high-rate fast charging and discharging of batteries increases, the above three cooling methods are not enough to support the higher rate charging and discharging of the battery cells (5C or above), so there are higher requirements for the thermal management system. When the battery cells are charged and discharged at a high rate, the temperature will quickly rise to the alarm temperature of the battery cells, which is difficult to cool quickly. Other cooling methods are urgently needed to achieve the purpose of rapid cooling.

[0003] Immersion cooling can achieve rapid cooling by immersing the battery in immersion liquid. It has the advantages of simple structure, rapid cooling, and good temperature uniformity. However, during the charging and discharging process of the battery pack, since the coolant is constantly flowing, it is easy to produce dead zones inside the battery pack, resulting in poor local heat exchange, making it difficult for immersion cooling to achieve a good cooling effect. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery pack, which limits the flow path of the coolant in the accommodating cavity, effectively avoids the local poor heat exchange of the module assembly, improves the heat exchange efficiency, and enables the battery pack to achieve a better cooling effect.

[0005] According to the battery pack of the utility model embodiment, it includes: a box body, the box body has a liquid inlet, a liquid outlet and a accommodating cavity, the liquid inlet and the liquid outlet are both connected to the accommodating cavity, the liquid inlet and the liquid outlet are located at two ends of the box body along a first direction; a module assembly, the module assembly is located in the accommodating cavity and extends along the first direction; a partition, the partition is located in the accommodating cavity, the two ends of the partition along the second direction are stopped against the cavity wall of the accommodating cavity, the partition has an assembly hole for the module assembly to pass through, and the first direction is perpendicular to the second direction.

[0006] According to the battery pack of the utility model embodiment, the box body has a liquid inlet, a liquid outlet and a accommodating chamber, the liquid inlet and the liquid outlet are both connected to the accommodating chamber, the module assembly is located in the accommodating chamber and extends along a first direction, the partition is located in the accommodating chamber, the liquid inlet and the liquid outlet are located at both ends of the box body along the first direction, and the two ends of the partition along the second direction are stopped against the cavity wall of the accommodating chamber, the partition has an assembly hole for the module assembly to pass through, so that the partition divides the accommodating chamber into a first area and a second area along the first direction, so that the coolant entering the first area through the liquid inlet fills the first area and flows into the second area through the module assembly, and the coolant in the second area flows out of the battery pack from the liquid outlet, thereby limiting the flow path of the coolant in the accommodating chamber, effectively avoiding local poor heat exchange in the module assembly, and improving the heat exchange efficiency, so that the battery pack can achieve a better cooling effect.

[0007] In some embodiments of the present invention, the cavity wall has two installation grooves, the openings of the two installation grooves are arranged opposite to each other along the second direction, and the two ends of the partition along the second direction extend into the two installation grooves respectively.

[0008] In some embodiments of the utility model, the box body includes: a lower shell; an upper shell, the upper shell is located above the lower shell and connected to the lower shell, the upper shell and the lower shell define the accommodating cavity, and the top wall of the partition is located above the top wall of the module assembly and abuts against the upper shell.

[0009] In some embodiments of the utility model, the module assembly includes a battery cell, an inlet guide plate and an outlet guide plate, the inlet guide plate and the outlet guide plate are located at both ends of the battery cell along the first direction, the inlet guide plate is located between the partition and the liquid inlet, the outlet guide plate is located between the partition and the liquid outlet, the inlet guide plate has a first guide hole connected to the accommodating cavity, and the outlet guide plate has a second guide hole connected to the accommodating cavity.

[0010] In some embodiments of the utility model, the battery cell extends along the second direction and is multiple, and the multiple battery cells are arranged in multiple rows and columns along the first direction and the up-down direction, the first guide holes are multiple and spaced apart along the up-down direction, the second guide holes are multiple and spaced apart along the up-down direction, and the up-down direction, the first direction, and the second direction are perpendicular to each other; and / or the battery cell is a cylindrical battery cell.

[0011] In some embodiments of the utility model, the module assembly also includes a module bracket, there are two module brackets, along the second direction, the battery cell is located between the two module brackets, the module bracket has a mounting hole, the two ends of the battery cell along the second direction respectively extend into the two mounting holes, and the inlet guide plate and the outlet guide plate are both connected to the two module brackets.

[0012] In some embodiments of the utility model, the module bracket includes a main body, a first connecting part and a second connecting part, the mounting hole is located on the main body, the two first connecting parts are located above the battery cell and extend along the second direction toward each other, one end of the two first connecting parts is connected to the main body and the other end is clamped and connected, the two second connecting parts are located below the battery cell and extend along the second direction toward each other, one end of the two second connecting parts is connected to the main body and the other end is clamped and connected.

[0013] In some embodiments of the present invention, the module assembly also includes a bus and an insulating plate, wherein there are two bus bars, the two bus bars are located on the side of the two module brackets facing away from each other, and the bus bars are connected to the battery cells, and there are two insulating plates, the two insulating plates are located on the side of the two bus bars facing away from each other and connected to the bus bar closest to the two bus bars.

[0014] In some embodiments of the utility model, both ends of the two module brackets along the first direction have protrusions for connecting to the box body, the inlet guide plate has two first recessed portions that cooperate with the protrusions of the two module brackets located on the same side, and the outlet guide plate has two second recessed portions that cooperate with the protrusions of the two module brackets located on the same side.

[0015] In some embodiments of the present invention, the module assembly is a plurality of modules stacked in sequence along the second direction, and the plurality of module assemblies are all inserted into the assembly hole; and / or the liquid outlet is located above the liquid inlet.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a partial exploded view of a battery pack according to the utility model;

[0019] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0020] Figure 3 It is a structural diagram of a module assembly according to the utility model;

[0021] Figure 4 An exploded view of a module assembly according to the utility model;

[0022] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0023] Figure 6 It is a side view of the module assembly according to the utility model.

[0024] Reference numerals:

[0025] 100. Battery pack;

[0026] 1. Box body; 11. Liquid inlet; 12. Accommodating chamber; 13. Mounting slot; 14. Upper shell; 15. Lower shell;

[0027] 2. Module assembly; 21. Cell; 22. Inlet guide plate; 221. First guide hole; 222. First recessed portion; 23. Outlet guide plate; 231. Second guide hole; 24. Module bracket; 241. Main body; 2411. Mounting hole; 2412. Bump; 242. First connection portion; 2421. First protrusion; 2422. First groove; 243. Second connection portion; 25. Bus; 26. Insulation plate;

[0028] 3. Partition; 31. Assembly hole. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] A battery pack 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0033] like Figure 1 As shown, the battery pack 100 according to the embodiment of the utility model comprises a box body 1, a module assembly 2 and a partition 3. The box body 1 has a liquid inlet 11, a liquid outlet and a receiving cavity 12. The liquid inlet 11 and the liquid outlet are both connected to the receiving cavity 12. The liquid inlet 11 and the liquid outlet are located at both ends of the box body 1 along a first direction. The module assembly 2 is located in the receiving cavity 12 and along the first direction (such as Figure 1 The partition 3 is located in the accommodating cavity 12, and the partition 3 is along the second direction (as shown in FIG. Figure 1 The two ends of the b direction shown in the figure abut against the cavity wall of the accommodating cavity 12, and the partition plate 3 has an assembly hole 31 for the module assembly 2 to penetrate, and the first direction and the second direction are perpendicular. Therefore, after the coolant enters the accommodating cavity 12 through the liquid inlet 11 and fills the accommodating cavity 12, it flows to the inside of the module assembly 2 and exchanges heat with the battery cell 21 of the module assembly 2, thereby cooling the battery cell 21 and improving the safety and reliability of the battery pack 100.

[0034] At the same time, the liquid inlet 11 and the liquid outlet are located at both ends of the box body 1 along the first direction, and the two ends of the partition 3 along the second direction are stopped against the cavity wall of the accommodating cavity 12, so that the partition 3 divides the accommodating cavity 12 into a first area and a second area along the first direction, and the first area is connected to the liquid inlet 11, and the second area is connected to the liquid outlet, and the partition 3 has an assembly hole 31 for the module assembly 2 to pass through, so that part of the module assembly 2 is located in the first area and part is located in the second area. As a result, the coolant entering the first area through the liquid inlet 11 fills the first area and flows into the second area through the module assembly 2, and the coolant in the second area flows out of the battery pack 100 from the liquid outlet, thereby limiting the flow path of the coolant in the accommodating cavity 12, effectively avoiding local poor heat exchange in the module assembly 2, and improving the heat exchange efficiency, so that the battery pack 100 can achieve a better cooling effect, significantly improving the life of the battery pack 100 and the safety of the battery system. In addition, by abutting the walls of the accommodating cavity 12 at both ends of the partition 3 along the second direction, the coolant in the first area is blocked from flowing from between the walls of the accommodating cavity 12 and the partition 3 to the second area, thereby further optimizing the flow path of the coolant, reducing flow dead angles, and improving the cooling effect of the battery pack 100.

[0035] Furthermore, the partition 3 is an epoxy board. It is understood that the epoxy board is a composite material made of epoxy resin and glass fiber cloth or paper, and has the characteristics of high temperature resistance, corrosion resistance, and good insulation performance. Therefore, in the battery pack 100, the reliability of the battery pack 100 is effectively improved by using the partition 3 as an epoxy board.

[0036] Furthermore, the liquid inlet 11 is located below the liquid outlet. Thus, through such an arrangement, the coolant entering through the liquid inlet 11 fills the first area from bottom to top and flows into the second area through the module assembly 2. The coolant in the second area flows out of the battery pack 100 from the liquid outlet, further limiting the flow path of the coolant in the accommodating cavity 12 and improving the cooling effect.

[0037] Therefore, using epoxy board as the separator 3 of the battery pack 100 can not only provide excellent insulation effect, but also ensure the safety and stability of the battery pack 100. In practical applications, this material is widely used in the fields of electronics, communications, aerospace, etc., and provides reliable protection for various equipment with its excellent performance.

[0038] According to the battery pack 100 of the embodiment of the utility model, the box body 1 has a liquid inlet 11, a liquid outlet and a accommodating chamber 12, the liquid inlet 11 and the liquid outlet are both connected to the accommodating chamber 12, the module assembly 2 is located in the accommodating chamber 12 and extends along the first direction, the partition 3 is located in the accommodating chamber 12, the liquid inlet 11 and the liquid outlet are located at both ends of the box body 1 along the first direction, and the two ends of the partition 3 along the second direction are stopped against the cavity wall of the accommodating chamber 12, the partition 3 has an assembly hole 31 for the module assembly 2 to pass through, so that the partition 3 divides the accommodating chamber 12 into a first area and a second area along the first direction, so that the coolant entering the first area through the liquid inlet 11 fills the first area and flows into the second area through the module assembly 2, and the coolant in the second area flows out of the battery pack 100 from the liquid outlet, thereby limiting the flow path of the coolant in the accommodating chamber 12, effectively avoiding local poor heat exchange in the module assembly 2, and improving the heat exchange efficiency, so that the battery pack 100 can achieve a better cooling effect.

[0039] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the cavity wall has two mounting grooves 13, the openings of the two mounting grooves 13 are arranged opposite to each other along the second direction, and the two ends of the partition 3 along the second direction extend into the two mounting grooves 13 respectively. Therefore, the installation of the partition 3 is achieved by extending the two ends of the partition 3 along the second direction into the two mounting grooves 13 respectively, and it is ensured that the partition 3 is not easy to loosen or shift after assembly, ensuring that the battery pack 100 can maintain stable performance during operation, thereby ensuring the flow path of the coolant in the accommodating cavity 12. At the same time, the setting of the mounting groove 13 plays a certain positioning role in the assembly process of the partition 3, reducing the difficulty of assembly and improving efficiency.

[0040] In some embodiments of the present invention, Figure 1 As shown, the box body 1 includes a lower shell 15 and an upper shell 14. Among them, the upper shell 14 is located above the lower shell 15 and is connected to the lower shell 15. The upper shell 14 and the lower shell 15 define a accommodating chamber 12. The top wall of the partition 3 is located above the top wall of the module assembly 2 and abuts against the upper shell 14. As a result, the upper shell 14 and the lower shell 15 define a closed accommodating chamber 12, which improves the reliability of the battery pack 100. The arrangement of the upper shell 14 and the lower shell 15 facilitates the assembly of the structure inside the battery pack 100 and reduces the difficulty of assembly. At the same time, by the top wall of the partition 3 being located above the top wall of the module assembly 2 and abutting against the upper shell 14, the coolant is effectively prevented from flowing from the gap between the partition 3 and the upper shell 14, and the flow path of the coolant is further optimized.

[0041] Furthermore, the lower shell 15 has a mounting groove 13, a liquid inlet 11 and a liquid outlet. Furthermore, the bottom wall of the partition 3 is flush with the bottom wall of the module assembly 2, further ensuring that the coolant entering the accommodating cavity 12 flows from the inside of the module assembly 2, optimizing the flow path.

[0042] Optionally, the material of the upper shell 14 is steel, and the material of the lower shell 15 is sheet metal.

[0043] In some embodiments of the present invention, Figure 3-Figure 6 As shown, the module assembly 2 includes a battery cell 21, an inlet guide plate 22 and an outlet guide plate 23, the inlet guide plate 22 and the outlet guide plate 23 are located at both ends of the battery cell 21 along the first direction, the inlet guide plate 22 is located between the partition 3 and the liquid inlet 11, the outlet guide plate 23 is located between the partition 3 and the liquid inlet 11, the inlet guide plate 22 has a first guide hole 221 communicating with the accommodating chamber 12, and the outlet guide plate 23 has a second guide hole 231 communicating with the accommodating chamber 12. Thus, the coolant entering the accommodating chamber 12 from the liquid inlet 11 enters the module assembly 2 through the first guide hole 221, flows through the surface of the battery cell 21, exchanges heat with the battery cell 21, flows out from the second guide hole 231, and then flows out of the battery pack 100 through the liquid outlet, thereby cooling the battery cell 21.

[0044] Furthermore, the inlet guide plate 22 and the outlet guide plate 23 are epoxy plates. It can be understood that the epoxy plate is a composite material made of epoxy resin and glass fiber cloth or paper, and has the characteristics of high temperature resistance, corrosion resistance, and good insulation performance. Therefore, in the battery pack 100, the reliability of the battery pack 100 is effectively improved by using the inlet guide plate 22 and the outlet guide plate 23 as epoxy plates.

[0045] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the battery cell 21 extends along the second direction and is in plurality, and the plurality of battery cells 21 extend along the first direction and the up-down direction (eg Figure 4 c direction shown in the figure) are arranged in multiple rows and columns, the first guide holes 221 are multiple and spaced apart along the up-down direction, the second guide holes 231 are multiple and spaced apart along the up-down direction, and the up-down direction, the first direction and the second direction are perpendicular to each other.

[0046] Therefore, the coolant entering the accommodating cavity 12 from the liquid inlet 11 enters the interior of the module assembly 2 through the multiple first guide holes 221 respectively, flows through the surfaces of the multiple battery cells 21 and exchanges heat with the multiple battery cells 21, then flows out from the multiple second guide holes 231 and flows out of the battery pack 100 through the liquid outlet, thereby cooling the multiple battery cells 21 and effectively improving the reliability of the battery pack 100.

[0047] Furthermore, each group of first guide holes 221 spaced apart in the up-down direction is a plurality of first guide holes 221 spaced apart in the second direction, and each group of second guide holes 231 spaced apart in the up-down direction is a plurality of second guide holes 231 spaced apart in the second direction. Thus, such an arrangement facilitates the coolant to flow into the module assembly 2 through the plurality of first guide holes 221 and to flow out of the module assembly 2 through the plurality of second guide holes 231, thereby further improving the heat exchange efficiency and optimizing the flow path of the coolant.

[0048] In some embodiments, the apertures of the multiple first flow guide holes 221 spaced apart in the vertical direction are the same or different. Therefore, the apertures of the multiple first flow guide holes 221 spaced apart in the vertical direction can be designed according to the layout of the multiple battery cells 21 in the module assembly 2 to control the flow distribution of the coolant so that the temperatures of the multiple battery cells 21 are all controlled within a reasonable range. For example, when the liquid inlet 11 is located at the lower position of the box body 1, the apertures of the multiple first flow guide holes 221 gradually increase from bottom to top, so that the coolant can flow evenly in the multiple battery cells 21 in the module assembly 2, thereby achieving the purpose of uniform temperature of the multiple battery cells 21.

[0049] In some embodiments, the apertures of the plurality of second guide holes 231 spaced apart in the vertical direction are the same or different. Thus, the apertures of the plurality of first guide holes 221 spaced apart in the vertical direction can be designed according to the layout of the plurality of battery cells 21 in the module assembly 2, so as to control the flow distribution of the coolant, so that the temperature of the plurality of battery cells 21 is controlled within a reasonable range.

[0050] In some embodiments of the present invention, Figure 3-Figure 6 As shown, the module assembly 2 further includes a module bracket 24, and there are two module brackets 24. Along the second direction, the battery cell 21 is located between the two module brackets 24. The module bracket 24 has a mounting hole 2411. Both ends of the battery cell 21 along the second direction extend into the two mounting holes 2411 respectively. The inlet guide plate 22 and the outlet guide plate 23 are both connected to the two module brackets 24. Therefore, through such an arrangement, the two module brackets 24 can fix the battery cell 21 to prevent the battery cell 21 from shifting, and the module bracket 24 can effectively protect the battery cell 21, thereby improving the reliability of the module assembly 2. Optionally, the module bracket 24 is formed into an injection molded part by injection molding.

[0051] At the same time, the inlet guide plate 22 and the outlet guide plate 23 are connected to the two module brackets 24 to achieve the fixation of the inlet guide plate 22 and the outlet guide plate 23. Further, the inlet guide plate 22 and the outlet guide plate 23 are bonded and connected to the two module brackets 24. In addition, after the module assembly 2 is placed in the accommodating cavity 12, the module bracket 24 is connected to the lower shell 15 to achieve the fixation of the module assembly 2 in the accommodating cavity 12, ensuring that the module assembly 2 can remain stable during the operation of the battery pack 100.

[0052] Furthermore, two ends of the battery cell 21 along the second direction extend into the two mounting holes 2411 respectively and are connected to the inner walls of the mounting holes 2411 by structural adhesive, thereby realizing the assembly of the two module brackets 24 and the battery cell 21 .

[0053] In some embodiments of the present invention, Figure 4 As shown, the module bracket 24 includes a main body 241, a first connecting part 242 and a second connecting part 243, the mounting hole 2411 is located on the main body 241, the two first connecting parts 242 are located above the battery cell 21 and extend along the second direction toward each other, one end of the two first connecting parts 242 is connected to the main body 241 and the other end is clamped, the two second connecting parts 243 are located below the battery cell 21 and extend along the second direction toward each other, one end of the two second connecting parts 243 is connected to the main body 241 and the other end is clamped.

[0054] Therefore, after the two module brackets 24 and the battery cells 21 are assembled, the two first connecting parts 242 are snap-connected and the two second connecting parts 243 are snap-connected to prevent the coolant from flowing through the gap between the two first connecting parts 242 and the gap between the two second connecting parts 243, thereby further optimizing the flow path of the coolant.

[0055] Furthermore, if Figure 5 As shown, one of the first connection parts 242 forms a first protrusion 2421 toward the other first connection part 242 , and the other connection part forms a first groove 2422 that cooperates with the first protrusion 2421 , and the two first connection parts 242 are snap-connected by the first protrusion 2421 extending into the first groove 2422 .

[0056] Furthermore, one of the second connection parts 243 forms a second protrusion toward the other second connection part 243, and the other connection part forms a second groove matching with the second protrusion, and the two second connection parts 243 are snap-connected by the second protrusion extending into the second groove.

[0057] In some embodiments of the present invention, Figure 3-Figure 6 As shown, the module assembly 2 also includes a bus 25 and an insulating plate 26. There are two bus bars 25, which are located on the side of the two module brackets 24 facing away from each other, and the bus bars 25 are connected to the battery cells 21. There are two insulating plates 26, which are located on the side of the two bus bars 25 facing away from each other and connected to the bus bar 25 closest to the two bus bars.

[0058] Thus, the current generated by the battery cells 21 can be collected and transmitted to the external circuit through the two busbars 25, thereby achieving current distribution and conduction. At the same time, the busbars 25 are effectively isolated from other components through the two insulating plates 26, thereby preventing the current from flowing on a path that should not flow, thereby avoiding the occurrence of a short circuit and improving the reliability of the battery pack 100.

[0059] Furthermore, the insulating plate 26 is an epoxy plate. It is understood that the epoxy plate is a composite material made of epoxy resin and glass fiber cloth or paper, and has the characteristics of high temperature resistance, corrosion resistance, and good insulation performance. Therefore, in the battery pack 100, the insulating plate 26 is an epoxy plate, which effectively improves the reliability of the battery pack 100.

[0060] In some embodiments of the present invention, Figure 1 , Figure 4 and Figure 6 As shown, both ends of the two module brackets 24 along the first direction have protrusions 2412 for connecting to the box body 1, the inlet guide plate 22 has two first recessed portions 222 that cooperate with the protrusions 2412 of the two module brackets 24 located on the same side, and the outlet guide plate 23 has two second recessed portions that cooperate with the protrusions 2412 of the two module brackets 24 located on the same side.

[0061] Thus, the module assembly 2 is fixed in the box 1 by connecting the protrusion 2412 with the box 1, ensuring that the position of the module assembly 2 will not move during the transportation and transfer of the battery pack 100, thereby improving the reliability of the battery pack 100. At the same time, the two first concave portions 222 of the inlet guide plate 22 cooperate with the protrusion 2412, and the two second concave portions of the outlet guide plate 23 cooperate with the protrusion 2412, so that the volume of the module assembly 2 is effectively reduced after the two module brackets 24 are spliced, thereby reducing the volume of the battery pack 100.

[0062] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the battery cell 21 is a cylindrical battery cell. Therefore, the coolant entering the accommodating cavity 12 from the liquid inlet 11 enters the module assembly 2 through the first guide hole 221, flows through the surface of the cylindrical battery cell and exchanges heat with the battery cell 21, then flows out from the second guide hole 231 and out of the battery pack 100 through the liquid outlet, thereby effectively cooling the cylindrical battery cell.

[0063] In some embodiments of the present invention, Figure 1As shown, the module assemblies 2 are stacked in sequence along the second direction, and the multiple module assemblies 2 are all inserted into the assembly hole 31. Therefore, through such an arrangement, the coolant entering the first area through the liquid inlet 11 fills the first area and flows into the second area through the multiple module assemblies 2, and the coolant in the second area flows out of the battery pack 100 from the liquid outlet, thereby cooling the multiple module assemblies 2.

[0064] Reference below Figure 1-Figure 6 The battery pack 100 of a specific embodiment of the present invention is described in detail. It can be understood that the following description is only an exemplary illustration and cannot be understood as a limitation to the present invention.

[0065] The battery pack 100 includes a box body 1, a module assembly 2 and a partition 3. The box body 1 has a liquid inlet 11, a liquid outlet and a receiving cavity 12. The liquid inlet 11 and the liquid outlet are both connected to the receiving cavity 12. The liquid inlet 11 and the liquid outlet are located at both ends of the box body 1 along a first direction. The module assembly 2 is located in the receiving cavity 12 and along the first direction (such as Figure 1 The partition 3 is located in the accommodating cavity 12, and the partition 3 is along the second direction (as shown in FIG. Figure 1 The two ends (in the direction b) shown in the figure abut against the cavity wall of the accommodating cavity 12, and the partition plate 3 has an assembly hole 31 for the module assembly 2 to pass through.

[0066] The module assembly 2 includes a battery cell 21, an inlet guide plate 22, an outlet guide plate 23, a module bracket 24, a busbar 25 and an insulating plate 26. The inlet guide plate 22 and the outlet guide plate 23 are located at both ends of the battery cell 21 along the first direction, and the inlet guide plate 22 is located on the side of the outlet guide plate 23 close to the liquid inlet 11. The inlet guide plate 22 has a first guide hole 221 communicating with the accommodating chamber 12, and the outlet guide plate 23 has a second guide hole 231 communicating with the accommodating chamber 12. There are two module brackets 24. Along the second direction, the battery cell 21 is located between the two module brackets 24. The module bracket 24 has a mounting hole 2411. Both ends of the battery cell 21 along the second direction extend into the two mounting holes 2411 respectively. The inlet guide plate 22 and the outlet guide plate 23 are both connected to the two module brackets 24. There are two busbars 25, which are located on the side of the two module brackets 24 away from each other, and the busbars 25 are connected to the battery cells 21. There are two insulating plates 26, which are located on the side of the two busbars 25 away from each other and connected to the busbar 25 closest to them.

[0067] It can be understood that, first, the two ends of the battery cell 21 along the second direction are respectively extended into the two mounting holes 2411, and then the two module brackets 24 are snap-connected to complete the assembly of the module bracket 24 and the battery cell 21. However, the busbar 25 and the positive and negative electrodes of the battery cell 21 are welded in series and parallel, and are respectively arranged on the side of the two module brackets 24 away from each other along the second direction, and then the two insulating plates 26 are arranged on the side of the two busbars 25 away from each other along the second direction and are bonded to the closest busbar 25. Finally, the inlet guide plate 22 and the outlet guide plate 23 are respectively arranged on the side of the two module brackets 24 away from each other along the first direction and connected to the two module brackets 24, so as to realize the assembly of the module assembly 2. After the module assembly 2 is placed in the accommodating cavity 12, the module assembly 2 is fixed by connecting the two module brackets 24 to the box body 1.

[0068] Therefore, when the battery pack 100 needs to be cooled, the coolant enters the accommodating cavity 12 from the liquid inlet 11 and enters the module assembly 2 through the first guide hole 221. The coolant flows through the surface of the battery cell 21 and exchanges heat with the battery cell 21, then flows out of the battery pack 100 from the second guide hole 231, and then flows out of the battery pack 100 through the liquid outlet, thereby cooling the battery cell 21. At the same time, the flow path of the coolant in the accommodating cavity 12 is limited by the partition 3, effectively avoiding local poor heat exchange in the module assembly 2, improving the heat exchange efficiency, so that the battery pack 100 can achieve a better cooling effect, and significantly improve the life of the battery pack 100 and the safety of the battery system.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0070] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A box body, the box body having a liquid inlet, a liquid outlet and a receiving cavity, the liquid inlet and the liquid outlet are both connected to the receiving cavity, and the liquid inlet and the liquid outlet are located at two ends of the box body along the first direction; A module assembly, the module assembly is located in the accommodating cavity and extends along the first direction; A partition, the partition is located in the accommodating cavity, the two ends of the partition along the second direction are abutted against the cavity wall of the accommodating cavity, the partition has an assembly hole for the module assembly to pass through, and the first direction is perpendicular to the second direction.

2. The battery pack according to claim 1, characterized in that: The cavity wall has two installation grooves, the openings of the two installation grooves are arranged opposite to each other along the second direction, and the two ends of the partition along the second direction extend into the two installation grooves respectively.

3. The battery pack according to claim 1, characterized in that: The box body comprises: Lower housing; An upper shell is located above the lower shell and connected to the lower shell, the upper shell and the lower shell define the accommodating cavity, and the top wall of the partition is located above the top wall of the module assembly and abuts against the upper shell.

4. The battery pack according to claim 1, characterized in that: The module assembly includes a battery cell, an inlet guide plate and an outlet guide plate, the inlet guide plate and the outlet guide plate are located at both ends of the battery cell along the first direction, the inlet guide plate is located between the partition and the liquid inlet, the outlet guide plate is located between the partition and the liquid outlet, the inlet guide plate has a first guide hole connected to the accommodating cavity, and the outlet guide plate has a second guide hole connected to the accommodating cavity.

5. The battery pack according to claim 4, characterized in that: The battery cells extend along the second direction and are multiple, the multiple battery cells are arranged in multiple rows and columns along the first direction and the up-down direction, the first flow guide holes are multiple and spaced apart along the up-down direction, the second flow guide holes are multiple and spaced apart along the up-down direction, and the up-down direction, the first direction, and the second direction are perpendicular to each other; And / or, the battery cell is a cylindrical battery cell.

6. The battery pack according to claim 4, characterized in that: The module assembly also includes a module bracket, and there are two module brackets. Along the second direction, the battery cell is located between the two module brackets. The module bracket has a mounting hole, and the two ends of the battery cell along the second direction extend into the two mounting holes respectively. The inlet guide plate and the outlet guide plate are both connected to the two module brackets.

7. The battery pack according to claim 6, characterized in that: The module bracket includes a main body, a first connecting part and a second connecting part, the mounting hole is located on the main body, the two first connecting parts are located above the battery cell and extend along the second direction toward each other, one end of the two first connecting parts is connected to the main body and the other end is clamped, the two second connecting parts are located below the battery cell and extend along the second direction toward each other, one end of the two second connecting parts is connected to the main body and the other end is clamped.

8. The battery pack according to claim 6, characterized in that: The module assembly also includes a bus and an insulating plate. There are two busbars, which are located on the side of the two module brackets facing away from each other, and the busbar is connected to the battery cell. There are two insulating plates, which are located on the side of the two busbars facing away from each other and connected to the busbar closest to the two busbars.

9. The battery pack according to claim 6, characterized in that: Both ends of the two module brackets along the first direction have protrusions for connecting to the box body, the inlet guide plate has two first recessed portions that cooperate with the protrusions of the two module brackets located on the same side, and the outlet guide plate has two second recessed portions that cooperate with the protrusions of the two module brackets located on the same side.

10. The battery pack according to claim 1, characterized in that: The module assembly is a plurality of modules stacked in sequence along the second direction, and the plurality of module assemblies are all inserted into the assembly hole; And / or, the liquid outlet is located above the liquid inlet.

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