Battery module and battery pack

Abstract

The present invention discloses a battery module, which comprises: a plurality of battery cells, the plurality of battery cells are distributed side by side along a first direction, each battery cell has a first large surface, the first direction is parallel to the first large surface, and the plurality of first large surfaces are distributed side by side along the first direction to form a first surface; the heat insulation plates are arranged between the adjacent battery cells in the first direction; and the liquid cooling plate is attached to the first surface and is used for introducing cooling liquid. The invention also discloses a battery pack. The battery module provided by the invention can realize efficient thermal management, effectively prevents the risk of thermal runaway between the battery cells, and enhances the safety performance and reliability of the whole battery module.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] As the core component of electric vehicles, battery packs are the power source of the vehicle. Fast charging is not only commonly used in vehicle-mounted packs, but also in mobile charging piles. As market customer demand increases, battery packs with fast charging functions will become a trend in the future. At the same time, battery packs with fast charging functions also have higher requirements for battery thermal management, etc.

[0003] However, existing technical solutions have disadvantages such as too many thermal management-related components, complex structure, poor reliability (e.g., easy leakage), low assembly efficiency, high manufacturing requirements, poor overall cost performance, inconvenient disassembly and maintenance of the battery cell, and large thermal resistance between the battery cell core and the liquid cooling plate. In addition, while improving battery thermal management, it is also necessary to comprehensively consider issues such as safety and extending the life of the battery cell. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a battery module and a battery pack.

[0005] In a first aspect, an embodiment of the present invention discloses a battery module, comprising:

[0006] A battery cell, wherein the battery cell has a plurality of battery cells, the plurality of battery cells are arranged side by side along a first direction, each of the battery cells has a first large surface, the first direction is parallel to the first large surface, and the plurality of first large surfaces are arranged side by side along the first direction to form a first surface;

[0007] A heat insulation board, the heat insulation board is provided between the adjacent battery cells along the first direction;

[0008] A liquid cooling plate is attached to the first surface and is used for passing cooling liquid.

[0009] The adoption of the above technical solution can achieve efficient thermal management, effectively prevent the risk of thermal runaway between battery cells, and enhance the safety performance and reliability of the overall battery module.

[0010] Optionally, it also includes fireproof and heat-insulating cotton, and each of the battery cells also has a second large surface arranged opposite to the first large surface along a second direction, the second direction is perpendicular to the first direction, and the second direction is perpendicular to the first large surface. A plurality of second large surfaces are distributed side by side along the first direction to form a second surface, and the fireproof and heat-insulating cotton is bonded to the second surface.

[0011] Optionally, the liquid cooling plate has a first end and a second end that are oppositely arranged along the first direction, and the liquid cooling plate includes:

[0012] a liquid inlet, arranged at the middle of the first end along a third direction, wherein the third direction is perpendicular to the first direction and the second direction;

[0013] Liquid outlets are provided at two opposite ends of the first end along the third direction;

[0014] a circulation channel extending from the first end along the first direction to the second end;

[0015] The liquid inlet and the liquid outlet are communicated with each other through the circulation channel.

[0016] Optionally, the circulation channel includes a first section and a second section, the first section is connected to the liquid inlet, the cooling liquid in the first section flows from the liquid inlet from the first end to the second end, the second section is connected to the first section, the cooling liquid in the second section flows from the second end to the first end, the second section is parallel to the first section along the third direction, and the second section is located between the liquid inlet and the liquid outlet along the third direction.

[0017] Optionally, the liquid cooling plate has a plurality of mounting parts at both ends along the third direction, the plurality of mounting parts are arranged at intervals along the first direction, and adjacent liquid cooling plates are detachably connected via the mounting parts.

[0018] Optionally, the liquid cooling plate further has bosses at both ends along the third direction, and the bosses are arranged between adjacent mounting portions.

[0019] Optionally, a side cover is further included, the side cover is an aluminum alloy profile, the side cover is arranged at both ends of the liquid cooling plate along the third direction, and the side cover is provided with air holes.

[0020] Optionally, a thermally conductive silicone sheet is provided between the side cover and the liquid cooling plate in the third direction.

[0021] Optionally, the side cover is further provided with an assembly hole, the assembly hole and the mounting portion are correspondingly arranged along the third direction, and the assembly hole is used for the mounting portion to pass through for detachable connection.

[0022] In a second aspect, an embodiment of the present invention discloses a battery pack, comprising a battery module as in any embodiment of the first aspect.

[0023] The above technical solution can achieve excellent heat dissipation capability, thermal runaway management capability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the explosion of some components of a battery module according to an embodiment of the present invention;

[0025] Figure 2 It is a three-dimensional schematic diagram of a liquid cooling plate according to an embodiment of the present invention;

[0026] Figure 3 is a cross-sectional schematic diagram of a liquid cooling plate according to an embodiment of the present invention;

[0027] Figure 4 It is a cross-sectional exploded schematic diagram of a liquid cooling plate according to an embodiment of the present invention;

[0028] Figure 5 A partial explosion diagram of a battery module according to an embodiment of the present invention

[0029] Figure 6 A three-dimensional schematic diagram of a battery module according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of an explosion of a battery module according to an embodiment of the present invention;

[0031] Figure 8 It is an exploded schematic diagram of parallel components between adjacent liquid cooling plates in a battery module according to an embodiment of the present invention;

[0032] Fig. 9 It is a partial schematic diagram of the connection of the bolt mounting assembly in the battery module according to the embodiment of the present invention;

[0033] Fig.10 Schematic diagram of an explosion of a bolt mounting assembly in a battery module according to an embodiment of the present invention.

[0034] 0. Battery module, 1. Cell group, 11. Cell, 111. First large surface, 112. Second large surface, 12. Heat insulation board, 2. Liquid cooling board, 20. First end, 20'. Second end, 21. Mounting part, 22. Boss, 23. Liquid inlet, 230. Total liquid inlet, 24. First liquid outlet, 240. First total liquid outlet, 25. Second liquid outlet, 250. Second total liquid outlet, 26. Circulation channel, 261. First section, 262. Second section, 263. Third section, 264. Fourth section, 265. Fifth section, 266. Sixth section, 267. Seventh section, 27. Baffle, 28. Parallel assembly, 281. Flow channel adapter base, 2811. Flow channel through hole, 282. Waterproof ring A, 283. Waterproof ring B, 284.

[0035] Plug, 285. Faucet joint, 290. Bolt, 291. Nut, 3. Fireproof insulation cotton, 4. Side cover, 41. Air vent, 42. Bolt installation assembly, 421. Nut, 422. Bushing, 423. Bolt, 5. Thermal conductive silicone sheet, 6. Top guard plate, 7. Bottom guard plate, 8.

[0036] Battery cover assembly, 9. Terminal fixing base

[0037] X. First direction, Z. Second direction, Y. Third direction DETAILED DESCRIPTION

[0038] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0039] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0040] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0041] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" 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 this embodiment can be understood according to specific circumstances.

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] In the embodiments of the present application, "large surface" refers to a surface with a larger area on the surface of the battery cell. In the present invention, the battery cell is flat, and the flat battery cell usually has two parallel long surfaces and one short surface, and the large surface refers to the long surface.

[0044] First, as Figure 1 , Figure 6 and Figure 7 As shown, an embodiment of the present invention provides a battery module 0, including: a battery cell 11, the battery cell 11 has a plurality of batteries, and the plurality of batteries 11 are arranged along a first direction (for example, Figure 1 The battery cells 11 are arranged side by side in the direction X shown in the figure. Each battery cell 11 has a first large surface 111. The first direction (for example Figure 1 The direction X shown in FIG. 1 is parallel to the first large surface 111, and the plurality of first large surfaces 111 are arranged along the first direction (for example, Figure 1 The heat insulation board 12 is arranged side by side along the first direction (for example, Figure 1 In the direction X) shown, a heat insulation plate 12 is provided between adjacent battery cells 11; a liquid cooling plate 2 is attached to the first surface for passing cooling liquid. That is, each battery cell 11 can be isolated into an independent compartment by the liquid cooling plate 2 and the heat insulation plate 12, and the liquid cooling plate 2 can directly contact the large surface of each battery cell 11. The heat insulation plate 12, for example, can be foam or aerosol, which can not only play a role in thermal isolation, but also provide a space for expansion when the battery cell 11 is thermally runaway.

[0045] With the above technical solution, the heat insulation board 12 is arranged between adjacent battery cells 11, and at the same time, the plurality of first large surfaces 111 are arranged along the first direction (for example, Figure 1 The direction X) shown in the figure is arranged side by side to form a design in which the first surface and the liquid cooling plate 2 are fitted together, that is, the liquid cooling plate 2 and the heat insulation plate 12 are designed to isolate each battery cell 11 into an independent compartment. As a result, the heat insulation plate 12 constructs an effective thermal isolation barrier, which effectively curbs the thermal bridge effect, that is, reduces the heat conduction path between adjacent battery cells 11, and reduces the probability of thermal short circuit; combined with the liquid cooling plate 2, it ensures that each battery cell 11 can achieve efficient convection cooling, avoids local overheating, and thus improves the thermal management system performance of the battery module 0. In addition, the liquid cooling plate 2 is fitted with the first large surface 111 of the battery cell 11, and the large surface means that there is more area available for heat transfer, which improves the heat conduction efficiency, and then enables the heat to be quickly transferred to the cooling liquid, thereby improving the heat dissipation efficiency of the battery module 0 and extending the cycle life of the battery cell 11. Therefore, the present invention uses the design of isolating each battery cell 11 into an independent compartment through the liquid cooling plate 2 and the insulation plate 12, and the design of large-surface bonding between the liquid cooling plate 2 and the battery cell 11, thereby jointly constructing an efficient thermal management solution, effectively preventing the risk of thermal runaway between the battery cells 11, and enhancing the safety performance and reliability of the overall battery module 0.

[0046] In an embodiment of the present invention, the battery module 0 also includes fireproof and heat-insulating cotton 3. As a highly efficient heat-insulating material, the fireproof and heat-insulating cotton 3 can effectively isolate the heat transfer between the battery cells 11 and prevent the heat spread caused by overheating of the battery cells 11, thereby reducing the overall thermal runaway risk of the battery module 0; on the other hand, it provides an expandable space for the battery cells 11, thereby improving the consistency and stability of the battery cells 11.

[0047] Furthermore, each battery cell 11 also has a second direction (for example, Figure 1 The second large surface 112 is arranged relative to the direction Z shown in the figure, the second direction is perpendicular to the first direction, the second direction is perpendicular to the first large surface 111, and multiple second large surfaces 112 are arranged side by side along the first direction to form a second surface, and the fireproof and heat-insulating cotton 3 is bonded to the second surface. In other words, the present invention further isolates each of the multiple battery cells 11 into an independent and closed compartment through the fireproof and heat-insulating cotton 3, the liquid cooling plate 2 and the heat-insulating plate 12. As a result, the heat influence between the battery cells 11 is further avoided, the heat dissipation efficiency is improved, the overall thermal balance of the battery module 0 is improved, and the potential damage risk caused by friction or collision between the battery cells 11 is reduced, and the thermal management performance of the battery module 0 is further enhanced.

[0048] Specifically, the fireproof heat-insulating cotton 3 is bonded to the second surface by adhesive, the heat-insulating plate 12 is bonded to the battery cell 11 by adhesive, and the first surface is bonded to the liquid cooling plate 2 by glue or adhesive process. Among them, a plurality of battery cells 11 are distributed side by side along the first direction, and an insulation plate 12 is provided between adjacent battery cells 11 to form a battery cell group. The second surface and the first surface are upper and lower surfaces of the battery cell group arranged relatively along the second direction. In some other possible embodiments provided by the present invention, the battery module of the present invention also includes a liquid-cooled battery unit, and the liquid-cooled battery unit may have multiple liquid-cooled battery units, which are composed of fireproof heat-insulating cotton 3, a battery cell group, a liquid cooling plate 2, a battery cell group, and fireproof heat-insulating cotton 3 distributed side by side along the second direction. As a result, the heat between the battery cells 11 can be transferred more evenly, and the heat dissipation effect is better. And the integrated design of the liquid-cooled battery unit reduces unnecessary parts, such as traditional independent cooling pipes and connectors, and reduces production costs. By simplifying the structure, reducing materials and assembly time, the production efficiency is further improved, while also reducing potential failure points and enhancing the reliability of the battery module 0.

[0049] In some other possible embodiments provided by the present invention, combined with Figure 1-Figure 4 As shown, the liquid cooling plate 2 has a first end 20 and a second end 20' arranged opposite to each other along a first direction, and the liquid cooling plate 2 includes: a liquid inlet 23, which is arranged at the first end 20 along a third direction (for example, Figure 1 The middle of the direction Y shown in the figure, the third direction (for example Figure 1 direction Y) and a first direction (e.g. Figure 1 direction X shown), a second direction (e.g. Figure 1The direction Z shown in the figure is perpendicular to each other; combined with the arrangement of the battery cell 11, it can be known that the middle part is close to the center of the battery cell 11, that is, the liquid inlet 23 is close to the center of the battery cell 11. Liquid outlet, the liquid outlet is arranged at two ends of the first end 20 that are oppositely arranged along the third direction, wherein the liquid outlet includes a first liquid outlet 24 and a second liquid outlet 25, that is, the first liquid outlet 24 and the second liquid outlet 25 are arranged at two ends of the first end 20 that are oppositely arranged along the third direction, and the liquid inlet 23 is arranged in the middle of the first liquid outlet 24 and the second liquid outlet 25 along the third direction. Circulation channel 26, the circulation channel 26 extends from the first end 20 to the second end 20' along the first direction, and the liquid inlet 23 and the liquid outlet are connected through the circulation channel 26, that is, the cooling liquid flows out from the liquid inlet 23 through the circulation channel 26 from the first liquid outlet 24 and the second liquid outlet 25.

[0050] Thus, the liquid inlet 23 is located at the first end 20 along the third direction (for example Figure 1 The middle part of the direction Y shown in the figure, and then close to the center of the battery cell 11, reduces the thermal resistance from the center of the battery cell 11 to the liquid cooling plate 2, so that the cooling liquid can cool the high temperature area of ​​the battery cell 11, which is beneficial to the heat exchange of the core high temperature area, effectively reduces the core temperature of the battery cell 11, and prevents the occurrence of thermal runaway. The liquid outlet (including the first liquid outlet 24 and the second liquid outlet 25) is arranged at both ends of the first end 20 along the third direction, and forms a loop with the liquid inlet 23 through the circulation channel 26, which helps the cooling liquid to flow evenly in the liquid cooling plate 2, thereby more effectively taking away heat from the central area of ​​the battery cell 11 and improving the cooling efficiency. In addition, the circulation channel 26 is extended from the first end 20 to the second end 20', so that the cooling liquid can cover the entire battery cell 11, ensuring that the battery cell 11 can be effectively cooled during the entire use process, thereby extending the service life of the battery cell 11.

[0051] The inventors also realize that the heat dissipation performance of the battery module 0 can be optimized by regulating the circulation channel 26 of the liquid cooling plate 2. Based on this, in the present embodiment, the circulation channel 26 includes a first section 261 and a second section 262, the first section 261 is connected to the liquid inlet 23, the cooling liquid in the first section 261 flows from the liquid inlet 23 from the first end 20 to the second end 20', the second section 262 is connected to the first section 261, the cooling liquid in the second section 262 flows from the second end 20' to the first end 20, the second section 262 is parallel to the first section 261 along the third direction, and the second section 262 is located between the liquid inlet 23 and the liquid outlet 25 along the third direction. At this time, when the cooling liquid in the second section 262 flows from the second end 20' to the first end 20, the cooling liquid slowly heats up due to absorbing heat. When the cooling liquid in the second section 262 reaches the first end 20, the second section 262 and the liquid inlet 23 are adjacent. Therefore, the cooling liquid with a lower temperature in the liquid inlet 23 cools the second section 262 again, reducing the temperature gradient of the cooling liquid during the circulation process, thereby achieving uniformity in the overall temperature distribution of the liquid cooling plate 2 and further improving the uniformity of heat dissipation.

[0052] Furthermore, the circulation channel 26 also includes a third section 263 and a fourth section 264, the second section 262 is connected to the third section 263, the cooling liquid in the third section 263 flows from the first end 20 to the second end 20', the fourth section 264 is connected to the third section 263 and the second liquid outlet 25, the cooling liquid in the fourth section 264 flows from the second end 20' to the first end 20 and flows out through the second liquid outlet 25, and the third section 263 and the fourth section 264 are parallel to the first section 261 along the third direction. Specifically, the first section 261, the second section 262, the third section 263 and the fourth section 264 are connected end to end to form a circuitous channel. As a result, the cooling liquid in the liquid cooling plate 2 refluxes through several channels, which not only improves the heat exchange efficiency of the cooling liquid, but also ensures that the heat can be evenly absorbed and dispersed, effectively reduces the temperature gradient of the cooling liquid during the circulation process, and makes the temperature distribution of the liquid cooling plate 2 more uniform.

[0053] In addition, in the present embodiment, the circulation channel 26 further includes: a fifth section 265, a sixth section 266 and a seventh section 267, the fifth section 265 and the second section 262 are arranged relative to each other along the third direction, the sixth section 266 and the third section 263 are arranged relative to each other along the third direction, the seventh section 267 and the fourth section 264 are arranged relative to each other along the third direction, the fifth section 265 is connected to the first section 261, the seventh section 267 is connected to the first liquid outlet 24, and the first section 261, the fifth section 265, the sixth section 266 and the seventh section 267 are connected end to end to form a circuitous channel. That is, the circulation channel 26 of the liquid cooling plate 2 is a circuitous channel symmetrically distributed along the first direction, which further improves the heat exchange efficiency of the liquid cooling plate 2, and makes the heat dissipation effect of the battery cell 11 more significant.

[0054] In this embodiment, the liquid cooling plate 2 of the present invention can be made of aluminum alloy profiles through CNC processing technology, and the flow channel 26 is arranged inside the liquid cooling plate 2. The first end 20 and the second end 20' of the liquid cooling plate 2 of the present invention further include a blocking bar 27, which can achieve the blocking of the first end 20 and the second end 20' through a welding process to form a closed flow channel 26.

[0055] Continue to refer Figure 1-Figure 4 As shown, in some other possible embodiments provided by the present invention, the liquid cooling plate 2 has a plurality of mounting portions 21 at both ends along the third direction, and the plurality of mounting portions 21 are spaced apart along the first direction, and adjacent liquid cooling plates 2 are detachably connected via the mounting portions 21. Specifically, the mounting portion 21 is, for example, a lug, which is detachably connected, for example, by bolts and nuts. As a result, the maintenance and repair of the battery module 0 are greatly facilitated. When the battery module 0 needs to be inspected or parts are replaced, the operator can quickly disassemble the connection, thereby improving the maintenance efficiency. Secondly, the distribution design of the plurality of mounting portions 21 enhances the overall structural stability of the liquid cooling plate 2, and the uniform force distribution helps to reduce the pressure at a single connection point, prevent structural damage caused by local overload, and extend the service life of the battery module 0.

[0056] Furthermore, the liquid cooling plate 2 has bosses 22 at both ends along the third direction, and bosses 22 are provided between adjacent mounting portions 21. Thus, the arrangement of the bosses 22 provides an effective mechanical protection mechanism when the battery cell 11 and the liquid cooling plate 2 may be subjected to extrusion and collision. When external forces act on the battery module 0, the bosses 22 can withstand and disperse these forces, thereby reducing direct impacts on the battery module 0 and protecting the internal structure from damage.

[0057] In some other possible embodiments provided by the present invention, Figure 5-Figure 8As shown, the battery module 0 of the present invention has multiple liquid cooling plates 2, and the multiple liquid cooling plates 2 are distributed side by side along the second direction. That is to say, the battery module 0 of the present invention has multiple first liquid outlets 24, multiple liquid inlets 23 and multiple second liquid outlets 25, multiple first liquid outlets 24 are connected in parallel through a parallel assembly 28 to form a first total liquid outlet 240, multiple liquid inlets 23 are connected in parallel through a parallel assembly 28 to form a total liquid inlet 230, and multiple second liquid outlets 25 are connected in parallel through a parallel assembly 28 to form a second total liquid outlet 250. Adjacent liquid cooling plates 2 and parallel assemblies 28 are detachably connected by bolts 290 and nuts 291, for example, adjacent first liquid outlets 24 and parallel assemblies 28 are detachably connected by bolts 290 and nuts 291, adjacent liquid inlets 23 and parallel assemblies 28 are detachably connected by bolts 290 and nuts 291, adjacent second liquid outlets 25 and parallel assemblies 28 are detachably connected by bolts 290 and nuts 291. Specifically, the parallel component 28 includes a flow channel adapter base 281, a flow channel through hole 2811 is provided in the middle along the second direction, two bolt through holes are provided along the third direction, and a groove for assembling with a waterproof ring is provided; a waterproof ring A (282), which is provided on both sides of the flow channel adapter base 281 along the second direction, and is a flexible material for realizing a sealed connection between the flow channel adapter base 281 and the liquid cooling plate 2; a waterproof ring B (283), which is provided on one side of the flow channel adapter base 281 along the first direction, that is, it cooperates with the flow channel through hole 2811, and is a flexible material for realizing a sealed connection between the faucet joint 285 or the plug 284 and the flow channel adapter base 281; the plug 284 is used to block the flow channel through hole 2811, and is detachably connected to the flow channel through hole 2811; the faucet joint 285 is used to pass and discharge cooling liquid, and is detachably connected to the flow channel through hole 2811. The bolt 290 passes through the terminal fixing base 9 and the liquid cooling plate 2 and the flow channel adapter base 281 and cooperates with the nut 291 to achieve structural fixation. The terminal fixing base 9 is used to fix the acquisition signal terminal. In this way, the risk of leakage between the liquid cooling plates 2 is reduced, and maintenance and assembly are facilitated.

[0058] Continue to refer Figure 5-Figure 7In this embodiment, the battery module 0 of the present invention further includes a side cover 4, which is an aluminum alloy profile. The side cover 4 is arranged at both ends of the liquid cooling plate 2 along the third direction, and the side cover 4 is provided with a vent hole 41. Thus, it has a good pressure relief function, which is beneficial to improving the safety performance of the battery module 0. Further, the battery cell 11 has an explosion-proof valve (not shown), and the vent hole 41 is arranged relative to the explosion-proof valve along the third direction. When the battery cell 11 has thermal runaway, a large amount of gas is generated, causing the internal pressure of the battery cell 11 to rise sharply, and the explosion-proof valve automatically opens, and then the pressure is relieved through the vent hole 41 to prevent the battery module 0 from exploding. Among them, the vent hole 41 can be made by the side cover 4 through CNC processing technology. Since the side cover 4 is an aluminum alloy profile, it has excellent thermal conductivity and pressure resistance, and is arranged at both ends of the liquid cooling plate 2 along the third direction, that is, it is arranged at both ends of the battery module 0 along the third direction, which is beneficial to further improve the heat dissipation performance and safety of the battery module 0.

[0059] Compared with the prior art, in this embodiment, a heat-conducting silicone sheet 5 is provided between the side cover 4 and the liquid cooling plate 2 in the third direction, that is, the heat-conducting silicone sheet 5 is located between the side cover 4 and the liquid cooling plate 2. Therefore, the heat-conducting silicone sheet 5 is used to transfer the heat on the tab (not shown) and the bus bar (not shown) to the side cover 4, and cooperates with the side cover 4 to further improve the heat dissipation performance of the battery module 0.

[0060] Furthermore, combined with Fig. 9 and Fig.10 As shown, in this embodiment, the side cover 4 is also provided with an assembly hole (not shown), and the assembly hole and the mounting portion 21 are arranged correspondingly along the third direction, and the assembly hole is used for the mounting portion 21 to pass through for detachable connection, that is, the mounting portion 21 passes through the assembly hole, and the adjacent mounting portions 21 are detachably connected. As a result, the entire module is detachably connected as a whole, which is convenient for assembly. Specifically, adjacent mounting portions 21 are detachably connected through a bolt mounting assembly 42, and the bolt mounting assembly 42 includes a nut 421, a sleeve 422 and a bolt 423. Among them, the sleeve 422 is used for bearing between adjacent liquid cooling plates 2. Preferably, the sleeve 422 is made of metal; the bolt 423 has a rectangular nut to prevent rotation during the assembly process; the bolt 423 passes through the mounting portion 21 and the sleeve 422 and is assembled and fixed by the nut 1.

[0061] In addition, if Figure 6 and Figure 7As shown, the battery module 0 of the present invention further includes a top guard plate 6, a bottom guard plate 7 and a battery cover assembly 8. The top guard plate 6 and the bottom guard plate 7 are respectively arranged at the two ends of the battery module 0 along the second direction, and the battery cover assembly 8 is arranged between the liquid cooling plate 2 and the thermal conductive silicone sheet 5 along the third direction. The top guard plate 6 can be, for example, a metal steel plate sprayed or coated, or a high-temperature resistant plastic sheet, and the top guard plate 6 is fixedly connected to the fireproof heat-insulating cotton 3. The bottom guard plate 7 can be, for example, a metal steel plate sprayed or coated, or a high-temperature resistant plastic sheet, and the bottom guard plate 7 is fixedly connected to the fireproof heat-insulating cotton 3. The battery cover assembly 8 can be, for example, an IBB assembly or a CCS assembly.

[0062] In a second aspect, an embodiment of the present invention provides a battery pack, comprising a battery module 0 as in any embodiment of the first aspect.

[0063] By adopting the above technical solution, the battery pack of the present invention integrates the battery module 0 of the above design, thereby having excellent heat dissipation capability, thermal runaway management capability and safety.

[0064] In summary, the battery module 0 of the present invention isolates the battery cell 11 into an independent compartment through the liquid cooling plate 2 and the heat insulation plate 12 to avoid thermal runaway between the battery cells 11; the large surface of the battery cell 11 is directly attached to the liquid cooling plate 2, reducing the thermal resistance from the center of the battery cell 11 to the liquid cooling plate 2, increasing thermal efficiency, effectively avoiding heat accumulation in the core part and damaging the battery, and helping to extend the life of the battery cell 11. And through the flow channel design of the liquid cooling plate 2, it is beneficial to control the temperature uniformity between the battery cells 11. The liquid cooling plate 2 is provided with a boss 22, which cooperates with the metal side cover 4 of the profile. The metal side cover 4 has the heat dissipation function of the pole ear and the bus bar, which can provide side collision or extrusion protection and good heat dissipation performance for the battery module 0. And the number of pipeline channels between the liquid cooling plates 2 of the present invention is small, reducing the risk of leakage. The number of structural parts related to thermal management (such as the number of liquid cooling plates 2, pipeline connectors) is also extremely small, and the number of components is small, which reduces the difficulty of assembly and the total material cost is relatively low. In addition, the entire module can be detachably connected to facilitate assembly and maintenance.

[0065] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery module, characterized in that: include: A battery cell, wherein the battery cell has a plurality of battery cells, the plurality of battery cells are arranged side by side along a first direction, each of the battery cells has a first large surface, the first direction is parallel to the first large surface, and the plurality of first large surfaces are arranged side by side along the first direction to form a first surface; A heat insulation board, the heat insulation board is provided between the adjacent battery cells along the first direction; A liquid cooling plate is attached to the first surface and is used for passing cooling liquid.

2. The battery module according to claim 1, characterized in that: It also includes fireproof and heat-insulating cotton. Each of the battery cells also has a second large surface arranged opposite to the first large surface along a second direction. The second direction is perpendicular to the first direction. The second direction is perpendicular to the first large surface. Multiple second large surfaces are distributed side by side along the first direction to form a second surface. The fireproof and heat-insulating cotton is bonded to the second surface.

3. The battery module according to claim 2, characterized in that: The liquid cooling plate has a first end and a second end oppositely disposed along the first direction, and the liquid cooling plate comprises: a liquid inlet, arranged at the middle of the first end along a third direction, wherein the third direction is perpendicular to the first direction and the second direction; Liquid outlets are provided at two opposite ends of the first end along the third direction; a circulation channel extending from the first end along the first direction to the second end; The liquid inlet and the liquid outlet are communicated with each other through the circulation channel.

4. The battery module according to claim 3, characterized in that: The circulation channel includes a first section and a second section, the first section is connected to the liquid inlet, the cooling liquid in the first section flows from the liquid inlet from the first end to the second end, the second section is connected to the first section, the cooling liquid in the second section flows from the second end to the first end, the second section is parallel to the first section along the third direction, and the second section is located between the liquid inlet and the liquid outlet along the third direction.

5. The battery module according to claim 3, characterized in that: The liquid cooling plate has a plurality of mounting parts at both ends along the third direction, the plurality of mounting parts are arranged at intervals along the first direction, and adjacent liquid cooling plates are detachably connected via the mounting parts.

6. The battery module according to claim 5, characterized in that: The liquid cooling plate further has bosses at both ends along the third direction, and the bosses are arranged between adjacent mounting portions.

7. The battery module according to claim 5, characterized in that: It also includes a side cover, which is an aluminum alloy profile. The side cover is arranged at both ends of the liquid cooling plate along the third direction, and the side cover is provided with air holes.

8. The battery module according to claim 7, characterized in that: A heat-conducting silicone sheet is provided between the side cover and the liquid cooling plate in the third direction.

9. The battery module according to claim 8, characterized in that: The side cover is further provided with an assembly hole, the assembly hole and the mounting portion are correspondingly arranged along the third direction, and the assembly hole is used for the mounting portion to pass through for detachable connection.

10. A battery pack, characterized in that: Comprising a battery module as described in any one of claims 1 to 9.

Images