Battery pack

Abstract

A battery pack (100), comprising: a battery case (1), the battery case (1) being internally provided with a battery module (4), and the bottom of the battery module (4) being provided with explosion-proof valves (5); and a bottom protection plate assembly, the bottom protection plate assembly comprising a liquid cooling plate (8) and a bottom protection plate component (9), the liquid cooling plate (8) being mounted at the bottom of the battery module (4), and the bottom protection plate component (9) being connected to the bottom of the battery case (1) and supported at the bottom of the liquid cooling plate (8). The liquid cooling plate (8) is provided with cooling flow channels and clearance channels (84), the clearance channels (84) directly facing the explosion-proof valves (5). The bottom protection plate component (9) is provided with exhaust passages (92) communicated with the clearance channels (84). In the battery pack (100), providing at the bottom of the battery case (1) the bottom protection plate assembly and the liquid cooling plate (8) improves the protection effect on the battery module (4) arranged inside the battery pack (100), and ensures the service safety of the battery pack (100), thus allowing for a better service effect and a wider range of application.

Description

battery pack

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 202322327011.8 filed with the China Patent Office on August 29, 2023, with the invention name “Battery Pack”, claims priority to the Chinese patent application with application number 202322328115.0 filed with the China Patent Office on August 29, 2023, with the invention name “Battery Pack”, claims priority to the Chinese patent application with application number 202322340682.8 filed with the China Patent Office on August 29, 2023, with the invention name “Battery Pack”, and claims priority to the Chinese patent application with application number 202322336238.9 filed with the China Patent Office on August 29, 2023, with the invention name “Battery Pack”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of battery pack manufacturing, and in particular to a battery pack. Background Art

[0004] Electric vehicles encounter a variety of complex operating conditions during operation. To enhance the battery pack's ability to cope with these conditions, its structural strength must be increased. The design of the battery pack structure directly impacts its overall safety performance. With increasing attention to safety and energy efficiency, battery pack safety is becoming increasingly important. With the development of new processes and technologies, battery pack structures are becoming increasingly diverse. Furthermore, as battery pack energy density continues to increase, highly integrated battery pack structures are becoming even more important.

[0005] Existing battery packs have various layouts, basically with the cell poles facing upward and the explosion-proof valve facing upward; or with the cell poles facing one side or both sides, with the explosion-proof valve and the poles on the same side; the above cell arrangements are relatively common, but existing battery packs have poor protection for the cells, and there is room for improvement.

[0006] Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery pack that can improve the protection effect of the battery module and ensure the safety of the battery pack.

[0008] According to the battery pack of the embodiment of the present application, it includes: a battery case, a battery module is arranged in the battery case, and an explosion-proof valve is arranged at the bottom of the battery module; a bottom guard plate assembly, the bottom guard plate assembly includes a liquid cooling plate and a bottom guard plate assembly, the liquid cooling plate is installed at the bottom of the battery module, the bottom guard plate assembly is connected to the bottom of the battery case and supported on the bottom of the liquid cooling plate, the liquid cooling plate is provided with a cooling channel and an avoidance groove, the avoidance groove is opposite to the explosion-proof valve, and the bottom guard plate assembly is provided with an exhaust channel connected to the avoidance groove.

[0009] According to the battery pack of the embodiment of the present application, by arranging a bottom guard plate assembly and a liquid cooling plate at the bottom of the battery box, the protection effect of the battery module arranged inside the battery pack is improved, the safety of the battery pack is ensured, the use effect is better, and the scope of application is wider.

[0010] According to the battery pack of some embodiments of the present application, the liquid cooling plate includes a bottom plate portion and a side plate portion, the bottom plate portion and the side plate portion are bent and connected and are both provided with the cooling channel, the bottom plate portion is located at the bottom of the battery module, and the side plate portion is located on the side of the battery module.

[0011] According to the battery pack of some embodiments of the present application, the cooling channel includes a first channel and a second channel, the extension direction of the first channel intersects with the extension direction of the second channel, the first channel is arranged on the bottom plate portion, and a portion of the second channel is located on the bottom plate portion and the other portion is located on the side plate portion.

[0012] According to the battery pack of some embodiments of the present application, the avoidance groove is distributed parallel to and spaced apart from the first flow channel.

[0013] According to the battery pack of some embodiments of the present application, a first thermally conductive structural adhesive is provided between the bottom plate and the battery module;

[0014] And / or, a pole is provided on a side of the battery module, the pole is connected to a bus bar, and a second heat-conducting structural adhesive is provided between the side plate and the bus bar.

[0015] According to the battery pack of some embodiments of the present application, the liquid cooling plate is provided with an avoidance hole and a connecting hole, the avoidance hole is arranged opposite to the explosion-proof valve, the avoidance hole and the connecting hole are respectively connected to the avoidance groove, and the avoidance groove is connected to the exhaust channel through the connecting hole.

[0016] According to the battery pack of some embodiments of the present application, each battery module has multiple explosion-proof valves, there are multiple avoidance holes that correspond one-to-one to the multiple explosion-proof valves, and the multiple avoidance holes are spaced apart and distributed along the extension direction of the avoidance groove.

[0017] According to the battery pack of some embodiments of the present application, the bottom guard plate assembly is further provided with a buffer cavity separated from the exhaust channel.

[0018] According to the battery pack of some embodiments of the present application, the bottom guard plate assembly is provided with a buffer member between the area where the buffer cavity is located and the liquid cooling plate.

[0019] According to the battery pack of some embodiments of the present application, the battery modules and the liquid cooling plates are both multiple and correspond one to one;

[0020] The buffer cavity includes a side buffer cavity and a middle buffer cavity. The side buffer cavity is located at the bottom of the battery module, and the middle buffer cavity is located at the bottom of the connection between two adjacent battery modules.

[0021] This application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of this application is to provide a battery pack with a bottom-mounted explosion-proof valve, with the avoidance hole of the first liquid cooling plate directly facing the explosion-proof valve, and the second liquid cooling plate connected to the battery module, so that the temperature of the entire battery module is uniform under normal charging and fast charging conditions.

[0022] According to the battery pack of an embodiment of the present application, it includes: a battery case, a battery module is installed in the battery case, and an explosion-proof valve is provided at the bottom of the battery module; a bottom guard plate assembly, the bottom guard plate assembly includes a first liquid cooling plate and a bottom guard plate, the bottom guard plate is connected to the bottom of the battery case, the first liquid cooling plate is located between the battery module and the bottom guard plate, and the first liquid cooling plate is provided with an avoidance hole facing the explosion-proof valve; a second liquid cooling plate, the second liquid cooling plate and the first liquid cooling plate are both provided with cooling channels, the second liquid cooling plate is installed on the top of the battery case and is used to cool the top and sides of the battery module.

[0023] According to the battery pack of the embodiment of the present application, a design of a bottom-mounted explosion-proof valve is adopted, and the avoidance hole of the first liquid cooling plate is directly opposite to the explosion-proof valve, and the second liquid cooling plate is connected to the battery module to cool the battery module in multiple directions, so that the temperature of the entire battery module is uniform under normal charging and fast charging conditions.

[0024] According to the battery pack of the embodiment of the present application, an exhaust space is defined between the bottom guard plate and the first liquid cooling plate, and the exhaust space is communicated with the avoidance hole.

[0025] According to the battery pack of the embodiment of the present application, a buffer is provided in the exhaust space, and the buffer is supported between the bottom guard plate and the first liquid cooling plate.

[0026] According to the battery pack of an embodiment of the present application, the second liquid cooling plate includes a top plate portion and a side plate portion, the top plate portion and the side plate portion are bent and connected and are both provided with the cooling flow channel, the top plate portion is located at the top of the battery module, and the side plate portion is located on the side of the battery module.

[0027] According to the battery pack of the embodiment of the present application, a first thermally conductive structural adhesive is provided between the top plate and the battery module; and / or, a pole is provided on the side of the battery module, the pole is connected to a bus, and a second thermally conductive structural adhesive is provided between the side plate and the bus.

[0028] According to the battery pack of an embodiment of the present application, the cooling channel includes a first channel and a second channel, the extension direction of the first channel intersects with the extension direction of the second channel, the first channel is arranged on the top plate portion, and a portion of the second channel is located on the top plate portion and the other portion is located on the side plate portion.

[0029] According to an embodiment of the present application, the battery pack further includes: a reinforcement member, which is installed on the top of the top plate portion near the edge of the side plate portion, and the reinforcement member extends outward to protrude from the side plate portion to be connected to the battery box.

[0030] According to the battery pack of an embodiment of the present application, the liquid cooling plate further includes an intermediate plate portion, which is connected to the lower side of the top plate portion, and the intermediate plate portion is parallel and spaced apart from the side plate portion; wherein, there are at least two battery modules, and the intermediate plate portion extends between two adjacent battery modules to cool the sides of the battery modules.

[0031] According to the battery pack of the embodiment of the present application, the battery case further includes a case side wall, the case side wall is provided with a buffer cavity, and the buffer cavity includes a plurality of buffer sub-cavities.

[0032] According to an embodiment of the present application, the battery pack further includes a box longitudinal beam, the battery modules and the first liquid cooling plates are both multiple and distributed one-to-one, the box longitudinal beam is connected between two adjacent first liquid cooling plates, and the ends of two adjacent battery modules close to each other are supported on the box longitudinal beam.

[0033] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery pack that can improve the protection effect of the battery module and ensure the safety of the battery pack.

[0034] According to the battery pack of the embodiment of the present application, it includes: a battery case, a battery module is installed in the battery case, and an explosion-proof valve is provided at the bottom of the battery module; a bottom guard plate assembly, the bottom guard plate assembly includes a bottom guard plate assembly and an explosion-proof valve protection member, the bottom guard plate assembly is connected to the bottom of the battery case, the explosion-proof valve protection member is supported between the bottom guard plate assembly and the battery module, and the explosion-proof valve protection member is provided with an avoidance groove directly opposite the explosion-proof valve; a liquid cooling plate, the liquid cooling plate is installed on the top of the battery case, a cooling channel is provided in the liquid cooling plate and is used to cool the top and sides of the battery module.

[0035] According to the battery pack of the embodiment of the present application, by arranging a bottom guard plate assembly at the bottom of the battery box and a liquid cooling plate at the top of the battery box, the protection effect of the battery module arranged inside the battery pack is improved, the safety of the battery pack is ensured, the use effect is better, and the scope of application is wider.

[0036] According to the battery pack of some embodiments of the present application, the liquid cooling plate includes a top plate portion and a side plate portion, the top plate portion and the side plate portion are bent and connected and are both provided with the cooling channel, the top plate portion is located at the top of the battery module, and the side plate portion is located at the side of the battery module.

[0037] According to the battery pack of some embodiments of the present application, the cooling channel includes a first channel and a second channel, the extension direction of the first channel intersects with the extension direction of the second channel, the first channel is arranged on the top plate portion, and a portion of the second channel is located on the top plate portion and the other portion is located on the side plate portion.

[0038] According to the battery pack of some embodiments of the present application, there are multiple first flow channels, and the multiple first flow channels are spaced apart in parallel along the length direction of the top plate portion, and the second flow channel is connected to the outermost first flow channel.

[0039] According to the battery pack of some embodiments of the present application, there are multiple second flow channels, and the multiple second flow channels are spaced apart in parallel along the width direction of the top plate portion.

[0040] According to the battery pack of some embodiments of the present application, a first thermally conductive structural adhesive is provided between the top plate and the battery module; and / or, a pole is provided on the side of the battery module, the pole is connected to a bus, and a second thermally conductive structural adhesive is provided between the side plate and the bus.

[0041] According to some embodiments of the present application, the battery pack further includes: a reinforcement member, which is installed on the top of the top plate portion near the edge of the side plate portion, and the reinforcement member extends outward to protrude from the side plate portion.

[0042] According to the battery pack of some embodiments of the present application, the explosion-proof valve protection component includes a support area and an avoidance area, the avoidance area is provided with the avoidance groove on the side facing the battery module, the support area is supported on the bottom of the battery module and a buffer groove is formed on the side facing the bottom guard plate assembly.

[0043] According to the battery pack of some embodiments of the present application, an elastic energy absorbing member is provided in the buffer groove.

[0044] According to the battery pack of some embodiments of the present application, the battery modules and the explosion-proof valve protection parts are multiple and correspond one to one, and a box longitudinal beam is connected between two adjacent explosion-proof valve protection parts.

[0045] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a battery pack that can realize the downward-facing explosion-proof valve, improve the bottom protection performance of the battery pack by providing a bottom guard plate, and reduce the risk of thermal runaway by providing an exhaust valve and exhaust channel.

[0046] According to the battery pack of the embodiment of the present application, it includes: a battery box, a battery module is installed in the battery box, and an explosion-proof valve is provided at the bottom of the battery module; a bottom guard plate assembly, the bottom guard plate assembly includes a bottom guard plate and a module bottom plate, the bottom guard plate is connected to the bottom of the battery box, the module bottom plate is supported between the battery module and the bottom guard plate, the module bottom plate is provided with an avoidance hole, the avoidance hole is arranged opposite to the explosion-proof valve, and the bottom guard plate is provided with an exhaust channel, and the exhaust channel is opened toward the avoidance hole.

[0047] According to the battery pack of the embodiment of the present application, by disposing a bottom guard plate assembly at the bottom of the battery case, the cooperation between the module bottom plate and the bottom guard plate can effectively absorb impact force, protect the explosion-proof valve and battery module, and improve the overall structural strength of the battery pack bottom. In addition, by disposing the explosion-proof valve at the bottom of the battery module, the exhaust channel of the bottom guard plate can be used for exhaust, eliminating the need for exhaust channels on the top or side of the battery module as in conventional battery packs. This achieves a compact internal design and helps improve the energy density of the battery pack. At the same time, the exhaust holes in the module bottom plate and the exhaust channels of the bottom guard plate can promptly and quickly exhaust internal gases, reducing the probability of thermal runaway and further improving the overall safety of the battery pack.

[0048] According to the battery pack of an embodiment of the present application, the module bottom plate is provided with an open avoidance groove on the side facing the bottom guard plate, the avoidance groove is directly opposite to the exhaust channel, and the avoidance hole is provided on the top wall of the avoidance groove.

[0049] According to the battery pack of the embodiment of the present application, there are multiple avoidance holes and they correspond one-to-one to the multiple explosion-proof valves. The multiple avoidance holes are spaced apart and distributed along the length direction of the avoidance groove.

[0050] According to the battery pack of the embodiment of the present application, the module bottom plate further includes at least two supporting areas, and the avoidance groove is defined between two adjacent supporting areas, and a first buffer support is provided between the supporting area and the battery module.

[0051] According to the battery pack of the embodiment of the present application, a plurality of buffer cavities are formed in the support area, and two adjacent buffer cavities are separated by a partition rib.

[0052] According to the battery pack of the embodiment of the present application, the side wall of the buffer cavity connected to the avoidance groove and / or at least one of the partition ribs are constructed as inclined reinforcement plates.

[0053] According to the battery pack of the embodiment of the present application, a cooling medium or a buffer material is provided in the buffer cavity.

[0054] According to the battery pack of the embodiment of the present application, the bottom guard plate is further provided with a buffer groove separated from the exhaust channel, and a second buffer support is provided in the buffer groove.

[0055] According to the battery pack of an embodiment of the present application, the buffer slot includes a first buffer slot and a second buffer slot, the first buffer slot is open on the side of the bottom guard plate away from the module bottom plate, and the second buffer slot is open on the side of the bottom guard plate toward the module bottom plate.

[0056] According to the battery pack of the embodiment of the present application, the battery pack further includes: a liquid cooling plate, which is installed on the top of the battery box and has a heat-conducting structural adhesive between the liquid cooling plate and the battery module.

[0057] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0059] FIG1 is an exploded view of a battery pack according to an embodiment of the present application;

[0060] FIG2 is a partial exploded view of a battery pack according to an embodiment of the present application;

[0061] FIG3 is a schematic structural diagram of a liquid cooling plate according to an embodiment of the present application;

[0062] FIG4 is a schematic structural diagram of a bottom guard plate assembly according to an embodiment of the present application;

[0063] FIG5 is an exploded view of a battery pack according to an embodiment of the present application;

[0064] FIG6 is a schematic structural diagram of a first liquid cooling plate and a bottom guard plate according to an embodiment of the present application;

[0065] FIG7 is a schematic structural diagram of a second liquid cooling plate according to an embodiment of the present application;

[0066] FIG8 is a schematic structural diagram of a first liquid cooling plate according to an embodiment of the present application;

[0067] FIG9 is an exploded view of a battery pack according to an embodiment of the present application;

[0068] FIG10 is a schematic structural diagram of a liquid cooling plate according to an embodiment of the present application;

[0069] FIG11 is a schematic diagram of the overall structure of a battery pack according to an embodiment of the present application;

[0070] FIG12 is a schematic structural diagram of a bottom guard plate assembly of a battery pack according to an embodiment of the present application;

[0071] FIG13 is a schematic structural diagram of a module bottom plate of a battery pack according to an embodiment of the present application;

[0072] FIG14 is a cross-sectional view taken along line A in FIG13 ;

[0073] FIG15 is a schematic structural diagram of a bottom guard plate of a battery pack according to an embodiment of the present application.

[0074] Figures: Battery pack 100, battery box 1, upper cover 2, structural adhesive 3, battery module 4, pole 41, bus bar 42, explosion-proof valve 5, first thermal conductive structural adhesive 6, second thermal conductive structural adhesive 7, liquid cooling plate 8, bottom plate 81, side plate 82, first flow channel 831, second flow channel 832, avoidance groove 84, avoidance hole 85, connecting hole 86, bottom guard plate assembly 9, buffer cavity 91, exhaust channel 92, buffer member 93, battery pack 20100, battery module 201, first liquid cooling plate 202, avoidance hole 2021, second liquid cooling plate 203, top plate 2031, first flow channel 20311, 20321-second flow channel; 2032-side plate; 2033-middle plate; 20331-middle flow channel; 2034-reinforcement; bottom thermal conductive structural adhesive 204, explosion-proof valve 205, bottom guard plate 206, box side wall 207, buffer cavity 2071, buffer 208, middle thermal conductive structural adhesive 209, first thermal conductive structural adhesive 2010, pole 2011, second thermal conductive structural adhesive 2012, box longitudinal beam 2013, battery pack 30100, battery box 301, battery module 302, bottom guard plate assembly 303, explosion-proof valve 304, insulation sheet 3041, first thermal conductive structural adhesive 305, pole 306, bus bar 307, second thermal conductive structural adhesive 308, box longitudinal beam 309, Explosion-proof valve protection component 3010, avoidance groove 30101, elastic energy absorber 30102, support area 30103, structural adhesive 30104, liquid cooling plate 3011, top plate 30111, side plate 30112, first flow channel 30113, second flow channel 30114, reinforcement 30115, battery pack 40100, battery box 401, battery module 4011, explosion-proof valve 4012, bottom guard plate assembly 402, module bottom plate 4021, avoidance hole 40211, avoidance groove 40212, support area 40213, buffer cavity 402131, partition rib 402132, bottom guard plate 4022, exhaust channel 40221, buffer groove 40222, first buffer groove 402221, second buffer groove 402222, Liquid cooling plate 403 , first buffer support 404 , second buffer support 405 , thermal conductive structural adhesive 406 . DETAILED DESCRIPTION

[0075] The following describes in detail embodiments of the present application. 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 application and are not to be construed as limiting the present application.

[0076] In the description of the present application, it should be understood 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", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application 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 application. 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 application, unless otherwise specified, "multiple" means two or more.

[0077] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0078] The following describes a battery pack 100 according to an embodiment of the present application with reference to FIG1 to FIG4 , which can improve the protection effect of the battery module 4 and ensure the safety of the battery pack 100 .

[0079] As shown in FIG1-FIG4 , the battery pack 100 according to an embodiment of the present application includes: a battery box 1 and a bottom guard plate assembly.

[0080] A battery module 4 is provided in the battery box 1, and an explosion-proof valve 5 is provided at the bottom of the battery module 4. The bottom guard plate assembly includes a liquid cooling plate 8 and a bottom guard plate assembly 9. The liquid cooling plate 8 is installed at the bottom of the battery module 4. The bottom guard plate assembly 9 is connected to the bottom of the battery box 1 and supported on the bottom of the liquid cooling plate 8. The liquid cooling plate 8 is provided with a cooling channel and an avoidance groove 84. The avoidance groove 84 is opposite to the explosion-proof valve 5. The bottom guard plate assembly 9 is provided with an exhaust channel 92 connected to the avoidance groove 84.

[0081] Specifically, the battery pack 100 is provided with a battery case 1, which supports and protects the internal structure of the battery pack 100. A battery module 4 is installed inside the battery case 1. An explosion-proof valve 5 is provided at the bottom of the battery module 4. There are multiple explosion-proof valves 5. The explosion-proof valve 5 is used to automatically open the valve when the battery module 4 is over-pressured or the temperature is too high, so as to directly dissipate the high-pressure gas inside the battery pack 100, thereby preventing explosion. An upper cover plate 2 is provided on the top of the battery module 4, and the upper cover plate 2 is connected to the battery module 4 by structural adhesive 3 to protect the top of the battery module 4.

[0082] Optionally, the battery pack 100 is also provided with a bottom guard plate assembly, which includes a liquid cooling plate 8 and a bottom guard plate assembly 9. The liquid cooling plate 8 is installed at the bottom of the battery module 4 to protect and support the battery module 4. A cooling channel is provided in the liquid cooling plate 8. The cooling channel can be used to cool the battery module 4 to ensure that the battery module 4 is temperature-balanced under normal charging and fast charging conditions, thereby ensuring the safety of the battery pack 100 and quickly achieving temperature balance of the battery module 4 when the battery module 4 is heated. The liquid cooling plate 8 is also provided with an avoidance groove 84, which is arranged opposite to the explosion-proof valve 5 and is open toward the explosion-proof valve 5, so that the high-pressure gas inside the battery pack 100 can be exhausted along the avoidance groove 84.

[0083] At the same time, the bottom guard plate assembly 9 is connected to the bottom of the battery box 1 and supported on the bottom of the liquid cooling plate 8. The bottom guard plate assembly 9 can be set to HC / DP high-strength steel or hot-formed steel, etc., so that the bottom guard plate assembly 9 has high strength. When the battery pack 100 is hit, deformation and the like can be avoided to protect the explosion-proof valve 5 and the battery module 4, etc., and the bottom guard plate assembly 9 is provided with an exhaust channel 92 connected to the avoidance groove 84. The high-pressure gas inside the battery pack 100 is exhausted to the exhaust channel 92 through the avoidance groove 84, and then the high-pressure gas is discharged from the battery pack 100 to ensure the safety of the battery pack 100.

[0084] According to the battery pack 100 of the embodiment of the present application, by arranging a bottom guard plate assembly and a liquid cooling plate 8 at the bottom of the battery case 1, the protection effect of the battery module 4 arranged inside the battery pack 100 is improved, the safety of the battery pack 100 is ensured, the use effect is better, and the scope of application is wider.

[0085] In some embodiments, the liquid cooling plate 8 includes a bottom plate portion 81 and a side plate portion 82 . The bottom plate portion 81 and the side plate portion 82 are bent and connected and are both provided with cooling channels. The bottom plate portion 81 is located at the bottom of the battery module 4 and the side plate portion 82 is located on the side of the battery module 4 .

[0086] Specifically, as shown in Figure 3, the liquid cooling plate 8 includes a bottom plate portion 81 and a side plate portion 82. The bottom plate portion 81 is arranged at the bottom of the battery module 4, and the side plate portion 82 is arranged on the side of the battery module 4. The bottom plate portion 81 and the side plate portion 82 are bent and connected, and both the bottom plate portion 81 and the side plate portion 82 are provided with cooling channels, so that the liquid cooling plate 8 can cool the battery module 4 more quickly and transfer heat more evenly.

[0087] In some embodiments, the cooling channel includes a first channel 831 and a second channel 832, the extension direction of the first channel 831 intersects with the extension direction of the second channel 832, the first channel 831 is arranged on the bottom plate portion 81, and a portion of the second channel 832 is located on the bottom plate portion 81 and the other portion is located on the side plate portion 82.

[0088] Specifically, as shown in Figure 3, the liquid cooling plate 8 is arranged at the bottom and side of the battery module 4, and the liquid cooling plate 8 is provided with a cooling channel, which can perform operations such as cooling and equalizing the temperature of the battery module 4. The cooling channel is provided with a first channel 831 and a second channel 832. The first channel 831 and the second channel 832 can both be used to cool the battery module 4. The first channel 831 is arranged on the bottom plate 81, and a part of the second channel 832 is located on the bottom plate 81 and the other part is located on the side plate 82, and the two parts are connected. The extension direction of the first channel 831 intersects with the extension direction of the second channel 832. In this embodiment, the extension direction of the first channel 831 is perpendicular to the extension direction of the second channel 832, thereby improving the cooling effect of the liquid cooling plate 8 on the battery module 4.

[0089] In some embodiments, the avoidance groove 84 is distributed parallel to and spaced apart from the first flow channel 831, and the liquid cooling plate 8 is installed at the bottom of the battery module 4. As shown in Figure 3, the liquid cooling plate 8 is provided with a avoidance groove 84, and the avoidance groove 84 is arranged opposite to the explosion-proof valve 5, and the avoidance groove 84 is distributed parallel to and spaced apart from the first flow channel 831, so that the liquid cooling plate 8 can cool the bottom of the battery module 4 normally while also exhausting the high-pressure gas in the battery pack 100, thereby improving the safety of the battery pack 100.

[0090] In some embodiments, a first thermally conductive structural adhesive 6 is provided between the bottom plate portion 81 and the battery module 4; and / or, a pole 41 is provided on the side of the battery module 4, the pole 41 is connected to the bus 42, and a second thermally conductive structural adhesive 7 is provided between the side plate portion 82 and the bus 42.

[0091] Specifically, as shown in Figure 1, a first thermally conductive structural adhesive 6 is provided between the bottom plate 81 of the liquid cooling plate 8 and the battery module 4. The bottom plate 81 of the liquid cooling plate 8 and the battery module 4 can be bonded by the first thermally conductive structural adhesive 6, and the first thermally conductive structural adhesive 6 can also perform operations such as heat transfer. When the liquid flows in the first flow channel 831, the heat of the battery module 4 can be transferred to the first flow channel 831 through the first thermally conductive structural adhesive 6, and then exchange heat with the liquid in the first flow channel 831.

[0092] Optionally, a pole 41 is provided on the side of the battery module 4, and the pole 41 is connected to a bus 42. A second thermally conductive structural adhesive 7 is provided between the side plate 82 and the bus 42. The bus 42 can be connected to the side plate 82 through the second thermally conductive structural adhesive 7. The second thermally conductive structural adhesive 7 can perform operations such as heat transfer. When the liquid flows in the second flow channel 832, the heat of the battery module 4 can be transferred to the second flow channel 832 through the second thermally conductive structural adhesive 7, and then exchange heat with the liquid in the second flow channel 832 to achieve cooling and temperature equalization of the pole 41.

[0093] In some embodiments, the liquid cooling plate 8 is provided with an avoidance hole 85 and a connecting hole 86. The avoidance hole 85 is arranged opposite to the explosion-proof valve 5. The avoidance hole 85 and the connecting hole 86 are respectively connected to the avoidance groove 84. The avoidance groove 84 is connected to the exhaust channel 92 through the connecting hole 86.

[0094] Specifically, as shown in Figure 3, the liquid cooling plate 8 is provided with an avoidance hole 85, which is arranged opposite to the explosion-proof valve 5. The shapes of the explosion-proof valve 5 and the avoidance hole 85 match, so that the explosion-proof valve 5 can be placed in the avoidance hole 85, and the liquid cooling plate 8 is also provided with a connecting hole 86. The avoidance hole 85 and the connecting hole 86 are respectively connected to the avoidance groove 84. The avoidance hole 85 is connected to the avoidance groove 84, so that the high-pressure gas inside the battery pack 100 can be discharged to the avoidance groove 84 through the explosion-proof valve 5, and the connecting hole 86 is also connected to the avoidance groove 84, so that the avoidance groove 84 can be connected through the connecting hole 86, and then the high-pressure gas in the avoidance groove 84 can be transmitted through the connecting hole 86, thereby ensuring the reliability of high-pressure gas transmission and improving the safety of the battery pack 100.

[0095] In some embodiments, each battery module 4 has multiple explosion-proof valves 5 , multiple avoidance holes 85 corresponding one-to-one to the multiple explosion-proof valves 5 , and the multiple avoidance holes 85 are spaced apart and distributed along the extension direction of the avoidance groove 84 .

[0096] Specifically, as shown in Figures 1 and 2, the liquid cooling plate 8 is provided with an avoidance hole 85, and the avoidance hole 85 is arranged opposite to the explosion-proof valve 5. The explosion-proof valve 5 can be set to multiple, and the avoidance hole 85 can also be set to multiple, and multiple avoidance holes 85 are arranged in a one-to-one correspondence with multiple explosion-proof valves 5, so that each explosion-proof valve 5 can effectively relieve pressure, and setting up multiple explosion-proof valves 5 can improve the pressure relief efficiency, further ensuring the safety of the battery pack 100. The multiple avoidance holes 85 are spaced apart and distributed along the extension direction of the avoidance groove 84, so that the high-pressure gas discharged through the explosion-proof valve 5 can be transported along the avoidance groove 84, thereby improving the pressure relief efficiency. At the same time, connecting ribs are provided between the multiple avoidance holes 85, which can avoid problems such as reduced strength of the liquid cooling plate 8 in the length direction due to the setting of the avoidance holes 85, thereby improving the overall structural strength of the battery pack 100.

[0097] In some embodiments, the bottom guard plate assembly 9 is further provided with a buffer cavity 91 spaced apart from the exhaust passage 92 .

[0098] Specifically, as shown in Figures 1-2 and 4, the bottom guard plate assembly 9 is also provided with a buffer cavity 91 separated from the exhaust channel 92. The buffer cavity 91 is provided in plurality, and the plurality of buffer cavities 91 are provided in parallel and spaced apart. The buffer cavity 91 can provide support for the bottom of the battery module 4 and can provide buffering. When the bottom of the battery pack 100 is hit, etc., its force first acts on the bottom guard plate assembly 9. The bottom guard plate assembly 9 is provided with a buffer cavity 91. The buffer cavity 91 can weaken the force and reduce the effect of the force, thereby protecting the liquid cooling plate 8 and the explosion-proof valve 5, etc., so as to protect the entire battery module 4 and improve the safety of the battery pack 100. The buffer cavity 91 can be provided as a cavity structure or as a solid. The interior of the cavity can also be filled with buffering material to further improve the buffering effect of the buffer cavity 91.

[0099] In some embodiments, the bottom guard plate assembly 9 is provided with a buffer member 93 between the area where the buffer cavity 91 is located and the liquid cooling plate 8 .

[0100] Specifically, as shown in Figure 1, the bottom guard plate assembly 9 is provided with a buffer part 93 between the area where the buffer cavity 91 is located and the liquid cooling plate 8. The buffer part 93 can be made of square microporous foam or honeycomb foam, etc., so that the buffer part 93 has good impact resistance and can effectively absorb the energy generated by the impact. When the bottom guard plate assembly 9 is subjected to external impact force, the force acts on the bottom guard plate assembly 9, and is buffered by the buffer cavity 91 of the bottom guard plate assembly 9 and then transmitted to the buffer part 93. The buffer part 93 buffers and absorbs energy, thereby weakening the effect of the force, thereby protecting the explosion-proof valve 5, and thus protecting the entire battery module 4.

[0101] In some embodiments, there are multiple battery modules 4 and liquid cooling plates 8 and they correspond one to one; the buffer cavity 91 includes a side buffer cavity 91 and a middle buffer cavity 91, the side buffer cavity 91 is located at the bottom of the battery module 4, and the middle buffer cavity 91 is located at the bottom of the connection between two adjacent battery modules 4.

[0102] Specifically, as shown in FIG1 , a plurality of battery modules 4 are provided, and a plurality of liquid cooling plates 8 are also provided, and the plurality of battery modules 4 and the plurality of liquid cooling plates 8 correspond one to one, thereby improving the protection effect of the battery module 4 and the cooling effect of the battery module 4 .

[0103] Optionally, as shown in Figures 1-2, the buffer cavity 91 includes a side buffer cavity 91 and a middle buffer cavity 91. The side buffer cavity 91 is located at the bottom of the battery module 4, and the middle buffer cavity 91 is located at the bottom of the connection between two adjacent battery modules 4. That is, the buffer cavity 91 can provide buffering support for the two sides and the middle of the battery module 4, thereby realizing three-point support for the bottom of the battery module 4 and ensuring the overall rigidity of the battery pack 100. The buffer cavity 91 can be filled with buffering material to further improve the buffering effect of the buffer cavity 91. The bottom guard plate assembly 9 is arranged at the bottom of the battery module 4 and can act as a longitudinal beam of the box body to improve the overall integration of the battery pack 100.

[0104] According to the battery pack 20100 of the embodiment of the present application, a design of a bottom-mounted explosion-proof valve 205 is adopted, and the avoidance hole of the first liquid cooling plate 202 is directly opposite to the explosion-proof valve 205, and the second liquid cooling plate 203 is connected to the battery module 201 to cool the battery module in multiple directions, so that the temperature of the entire battery module is uniform under normal charging and fast charging conditions.

[0105] The battery pack 20100 according to an embodiment of the present application is described below with reference to Figures 5 to 8, including: a battery box, a bottom guard plate assembly and a second liquid cooling plate 203.

[0106] A battery module 201 is installed in the battery box, and an explosion-proof valve 205 is provided at the bottom of the battery module 201. The bottom guard plate assembly includes a first liquid cooling plate 202 and a bottom guard plate 206. The bottom guard plate 206 is connected to the bottom of the battery box. The first liquid cooling plate 202 is located between the battery module 201 and the bottom guard plate 206. The first liquid cooling plate 202 is provided with an avoidance hole 2021 directly opposite the explosion-proof valve 205.

[0107] Cooling channels are provided in both the second liquid cooling plate 203 and the first liquid cooling plate 202 . The second liquid cooling plate 203 is mounted on the top of the battery box and is used to cool the top and sides of the battery module 201 .

[0108] In practice, the battery box can be made of lightweight steel material, and the material is generally high-strength steel such as HC340 / 590DP, HC420 / 780 and above. It is formed through a roll-pressing process to reduce the overall weight. The side wall 207 of the box and the bottom guard plate assembly form a accommodating space, and the battery module 201 can be set in the accommodating space. Specifically, when the explosion-proof valve 205 is set, multiple explosion-proof valves 205 are spaced apart at the bottom of the battery module 201, and the pole 2011 is set on the other side of the battery module 201. The explosion-proof valve 205 is set at the bottom of the battery module 201 and is connected to the battery module 201. In this way, the explosion-proof valve 205 exhausts downward to achieve thermal and electrical separation.

[0109] Among them, the first liquid cooling plate 202 is connected to the bottom of the battery module 201 through the bottom thermal conductive structural adhesive 204. The bottom thermal conductive structural adhesive 204 has both the function of transferring energy and the function of connection. The first liquid cooling plate 202 is used to cool the bottom of the battery module 201, and when the first liquid cooling plate 202 is cooling, the avoidance hole 2021 of the first liquid cooling plate 202 has the function of exhausting when the explosion-proof valve 205 is opened. At the same time, the second liquid cooling plate 203 is installed on the top of the battery box, and the first liquid cooling plate 202 and the second liquid cooling plate 203 are both provided with cooling channels, which are used to accommodate coolant. The second liquid cooling plate 203 cools the top and sides of the battery module 201. Through the combination of the first liquid cooling plate 202 and the second liquid cooling plate 203, the battery module 201 can be better cooled.

[0110] Therefore, the battery module 201 of the embodiment of the present application adopts a design with a bottom-mounted explosion-proof valve 205, and the avoidance hole 2021 of the first liquid cooling plate 202 is directly opposite to the explosion-proof valve 205, and the second liquid cooling plate 203 is connected to the battery module 201 to cool the top and bottom of the battery module 201, so that the temperature of the entire battery module 201 is uniform under normal charging and fast charging conditions.

[0111] In some embodiments, an exhaust space is defined between the bottom guard plate 206 and the first liquid cooling plate 202, and the exhaust space is connected to the avoidance hole 2021. First, while the first liquid cooling plate 202 cools the bottom of the battery module 201, the exhaust space defined between the first liquid cooling plate 202 and the bottom guard plate 206 allows gas to flow from the explosion-proof valve 205 to the avoidance hole 2021 of the first liquid cooling plate 202 when pressure changes occur in the battery module 201. From the avoidance hole 2021, gas flows to one side of the bottom guard plate 206, and then from the exhaust space between the bottom guard plate 206 and the first liquid cooling plate 202 to the pressure relief valve on the side wall 207 of the battery box. Gas is discharged through the pressure relief valve on the side wall 207, thereby ensuring the safety of the battery module 201. At the same time, the first liquid cooling plate 202 cools and protects the battery module 201, ensuring that the temperature of the battery module 201 is balanced under normal charging and fast charging conditions.

[0112] In some embodiments, a buffer member 208 is disposed in the exhaust space, and the buffer member 208 is supported between the bottom guard plate 206 and the first liquid cooling plate 202 .

[0113] Specifically, the buffer 208 is connected to the bottom guard plate 206, and the buffer 208 can be a honeycomb structure. The buffer 208 is arranged in parallel and spaced apart along the bottom guard plate 206. The buffer 208 can improve the buffering performance of the battery module 201 when the battery box is hit by external impact, thereby improving the protection effect of the explosion-proof valve 205 and the battery module 201. The buffer 208 generally adopts structures such as MPP square microporous foam, PP interlayer, etc.

[0114] In some embodiments, the second liquid cooling plate 203 includes a top plate portion 2031 and a side plate portion 2032 . The top plate portion 2031 and the side plate portion 2032 are bent and connected and are both provided with cooling channels. The top plate portion 2031 is located at the top of the battery module 201 , and the side plate portion 2032 is located on the side of the battery module 201 .

[0115] Specifically, as shown in Figures 5 and 7, the second liquid cooling plate 203 includes a top plate portion 2031 and a side plate portion 2032. The top plate portion 2031 is arranged on the top of the battery module 201, and the side plate portion 2032 is arranged on the side of the battery module 201. The top plate portion 2031 and the side plate portion 2032 are bent and connected, and both the top plate portion 2031 and the side plate portion 2032 are provided with cooling channels, so that the second liquid cooling plate 203 can cool the battery module 201 more quickly and transfer heat more evenly.

[0116] In some embodiments, a first thermally conductive structural adhesive 2010 is provided between the top plate portion 2031 and the battery module 201; and / or, a pole 2011 is provided on the side of the battery module 201, the pole 2011 is connected to a bus, and a second thermally conductive structural adhesive 2012 is provided between the side plate portion 2032 and the bus.

[0117] In practice, the first thermally conductive structural adhesive 2010 can bond the top plate 2031 of the second liquid cooling plate 203 to the battery module 201. At the same time, the first thermally conductive structural adhesive 2010 also has the function of transferring the heat of the top plate 2031 of the first liquid cooling plate 202 to the battery module 201. At the same time, the second thermally conductive structural adhesive 2012 connects the side plate 2032 of the first liquid cooling plate 202 to the bus of the battery module 201. During charging, the temperature of the bus is very high. Cooling the bus through the side plate 2032 can further ensure the safety of the battery module 201. At the same time, the top plate 2031 and side plate 2032 of the first liquid cooling plate 202 and the second liquid cooling plate 203 can ensure that the battery module 201 is under normal charging and fast charging conditions, and further achieve temperature balance of the entire battery module 201.

[0118] In some embodiments, the cooling channel includes a first channel 20311 and a second channel 20321, the extension direction of the first channel 20311 intersects with the extension direction of the second channel 20321, the first channel 20311 is arranged on the top plate portion 2031, and a part of the second channel 20321 is located on the top plate portion 2031 and the other part is located on the side plate portion 2032.

[0119] Specifically, as shown in Figure 7, the first flow channel 20311 includes multiple, and the multiple first flow channels 20311 are arranged in parallel and spaced apart. The first flow channels 20311 are spaced apart along the left and right directions in Figure 5. At the same time, there are multiple second flow channels 20321, and the multiple second flow channels 20321 are spaced apart. The extension direction of the first flow channel 20311 is arranged perpendicular to the extension direction of the second flow channel 20321, thereby improving the cooling effect of the liquid cooling plate on the battery module 201.

[0120] In some embodiments, it further includes: a reinforcement member 2034, which is installed on the top of the top plate portion 2031 near the edge of the side plate portion 2032, and the reinforcement member 2034 extends outward to protrude from the side plate portion 2032 to be connected to the battery box.

[0121] In practice, the reinforcement 2034 and the second liquid cooling plate 203 are welded or connected or bonded by fixing parts, and the second liquid cooling plate 203 is connected to the battery box through the reinforcement 2034. When the battery box is hit by external force, the buffering force of the battery box can be enhanced, which has a better protective effect on the second liquid cooling plate 203 and the battery box.

[0122] In addition, the reinforcement 2034 is extended outward to protrude from the side plate portion 2032, so that the structure of the reinforcement 2034 is bent. This can further enhance the buffering capacity of the reinforcement 2034 from a structural perspective, thereby improving the protection performance of the reinforcement 2034 on the second liquid cooling plate 203 and the battery module 201.

[0123] In some embodiments, the second liquid cooling plate 203 further includes an intermediate plate portion 2033, which is connected to the lower side of the top plate portion 2031, and the intermediate plate portion 2033 is parallel and spaced apart from the side plate portion 2032; wherein, there are at least two battery modules 201, and the intermediate plate portion 2033 extends between two adjacent battery modules 201 to cool the sides of the battery modules 201.

[0124] As shown in Figures 5 and 7, the middle plate 2033 extends toward the position between the two adjacent battery modules 201 and is bonded to the position between the two adjacent battery modules 201 through the middle thermal conductive structural adhesive 209. The middle thermal conductive structural adhesive 209 has the function of bonding the middle plate 2033 to the battery module 201. At the same time, a middle flow channel 20331 is provided in the middle plate 2033. The cooling flow channel in the middle plate 2033 is connected to the cooling flow channel of the top plate 2031. The middle thermal conductive structural adhesive 209 can also transfer the energy of the second liquid cooling plate 203 to the bus on the opposite side of the adjacent battery module 201, so that the bus temperature of the adjacent battery module 201 is reduced. Therefore, the joint action of the second liquid cooling plate 203 and the first liquid cooling plate 202 can make the temperature of the battery module 201 uniform and prevent the temperature from being too high.

[0125] In some embodiments, the battery box further includes a box side wall 207 , and the box side wall 207 is provided with a buffer cavity 2071 , and the buffer cavity 2071 includes a plurality of buffer sub-cavities.

[0126] 5 and 6 , the side wall 207 of the battery case includes a buffer cavity 2071, and a plurality of square sub-buffer cavities are arranged in the buffer cavity 2071. At the same time, the side wall 207 of the battery case extends outward to form a case connecting portion, which fixes the battery case in a specific position. The case connecting portion is also provided with a plurality of sub-buffer cavities. By providing the side wall and the case connecting portion of the battery case with a plurality of sub-buffer cavities, the buffering force of the battery case when subjected to external collisions can be enhanced, and the battery case can be better protected. At the same time, the side wall of the battery case is provided with a plurality of sub-buffer cavities, which can reduce the weight of the battery case.

[0127] In some embodiments, a box longitudinal beam 2013 is further included. The battery modules 201 and the first liquid cooling plates 202 are both multiple and distributed one-to-one. The box longitudinal beam 2013 is connected between two adjacent first liquid cooling plates 202, and the ends of two adjacent battery modules 201 close to each other are supported on the box longitudinal beam 2013.

[0128] 5 and 6 , two battery modules 201 are provided inside the battery box. A first liquid cooling plate 202 is provided at the bottom of each battery module 201. Two adjacent first liquid cooling plates 202 are connected by a box longitudinal beam 2013. The liquid cooling plate at the bottom of the box longitudinal beam 2013 adopts a split structure, i.e., it includes two first liquid cooling plates 202. The box longitudinal beam 2013 and the battery box jointly support the battery module 201, and the overall structural rigidity is relatively high.

[0129] The following describes the battery pack 100 according to an embodiment of the present application with reference to Figures 9 and 10, which can improve the protection effect of the battery module 302 and ensure the safety of the battery pack 30100.

[0130] As shown in FIG9-FIG10 , the battery pack 30100 according to an embodiment of the present application includes: a battery box 1 , a bottom guard plate assembly and a liquid cooling plate 3011 .

[0131] A battery module 302 is installed in the battery box 301, and an explosion-proof valve 304 is provided at the bottom of the battery module 302. The bottom guard plate assembly includes a bottom guard plate assembly 303 and an explosion-proof valve protection member 3010. The bottom guard plate assembly 303 is connected to the bottom of the battery box 301, and the explosion-proof valve protection member 3010 is supported between the bottom guard plate assembly 303 and the battery module 302. The explosion-proof valve protection member 3010 is provided with an avoidance groove 30101 that is directly opposite to the explosion-proof valve 304. A liquid cooling plate 3011 is installed on the top of the battery box 301. A cooling channel is provided in the liquid cooling plate 3011 and is used to cool the top and sides of the battery module 302.

[0132] Specifically, the battery pack 30100 is provided with a battery case 301, which is arranged on both sides of the battery pack 30100, and the battery case 301 supports and protects the internal structure of the battery pack 30100. A battery module 302 is installed inside the battery case 301, and a plurality of explosion-proof valves 304 are provided at the bottom of the battery module 302. The explosion-proof valve 304 is used to automatically open the valve when the battery module 302 is over-pressured or the temperature is too high, so as to directly dissipate the high-pressure gas inside the battery pack 30100, thereby preventing explosion, and each explosion-proof valve 304 is correspondingly provided with an insulating sheet 3041.

[0133] Optionally, the battery pack 30100 is further provided with a bottom guard plate assembly, which includes a bottom guard plate assembly 303 and an explosion-proof valve protection member 3010. The bottom guard plate assembly 303 is connected to the bottom of the battery box 301, and the bottom guard plate assembly 303 can be set to HC340 / 590DP high-strength steel or hot-formed steel, etc., so that the bottom guard plate assembly 303 has high strength, and can avoid deformation when the battery pack 30100 is hit, so as to protect the explosion-proof valve 304 and the battery module 302, etc. The explosion-proof valve protection member 3010 is supported between the bottom guard plate assembly 303 and the battery module 302. The explosion-proof valve 304 is connected to the bottom of the battery module 302 by structural adhesive 30104, etc., and the explosion-proof valve protection part 3010 is provided with an avoidance groove 30101 facing the explosion-proof valve 304. The avoidance groove 30101 is open toward the explosion-proof valve 304. The avoidance groove 30101 can be designed to be U-shaped so that the high-pressure gas inside the battery pack 30100 can be exhausted along the avoidance groove 30101. The insulating sheet 3041 is arranged between the explosion-proof valve 304 and the avoidance groove 30101. The insulating sheet 3041 can prevent the explosion-proof valve 304 from arcing under extreme working conditions, thereby ensuring the use effect.

[0134] The battery pack 30100 is also provided with a liquid cooling plate 3011, which is installed on the top of the battery case 301 and is connected to the battery case 301 by bonding, screwing or welding. It can protect and support the battery module 302 inside the battery pack 30100, and a cooling channel is provided in the liquid cooling plate 3011. The cooling channel can be used to cool the top and sides of the battery module 302 to ensure that the temperature of the battery module 302 is balanced under normal charging and fast charging conditions, thereby ensuring the safety of the battery pack 30100, and the temperature balance of the battery module 302 can be quickly achieved when the battery module 302 is heated.

[0135] According to the battery pack 30100 of the embodiment of the present application, by arranging a bottom guard plate assembly at the bottom of the battery case 301 and a liquid cooling plate 3011 at the top of the battery case 301, the protection effect of the battery module 302 arranged inside the battery pack 30100 is improved, thereby ensuring the safety of the battery pack 30100, and having better use effect and a wider range of applications.

[0136] In some embodiments, the liquid cooling plate 3011 includes a top plate portion 30111 and a side plate portion 30112. The top plate portion 30111 and the side plate portion 30112 are bent and connected and are both provided with cooling channels. The top plate portion 30111 is located at the top of the battery module 302, and the side plate portion 30112 is located on the side of the battery module 302.

[0137] Specifically, as shown in Figure 10, the liquid cooling plate 3011 includes a top plate portion 30111 and a side plate portion 30112. The top plate portion 30111 is arranged on the top of the battery module 302, and the side plate portion 30112 is arranged on the side of the battery module 302. The top plate portion 30111 and the side plate portion 30112 are bent and connected, and the top plate portion 30111 and the side plate portion 30112 are both provided with cooling channels, so that the liquid cooling plate 3011 can cool the battery module 302 more quickly and transfer heat more evenly.

[0138] In some embodiments, the cooling channel includes a first channel 30113 and a second channel 30114, the extension direction of the first channel 30113 intersects with the extension direction of the second channel 30114, the first channel 30113 is arranged on the top plate portion 30111, and a portion of the second channel 30114 is located on the top plate portion 30111 and the other portion is located on the side plate portion 30112.

[0139] Specifically, as shown in Figure 10, the liquid cooling plate 3011 is arranged on the upper part and the side of the battery module 302. The liquid cooling plate 3011 is provided with a cooling channel, which can cool down and equalize the temperature of the battery module 302. The cooling channel is provided with a first channel 30113 and a second channel 30114. The first channel 30113 and the second channel 30114 can both be used to cool down the battery module 302. The first channel 113 is provided on the top plate 30111, and a part of the second channel 30114 is located on the top plate 30111 and the other part is located on the side plate 30112, and the two parts are connected. The extension direction of the first channel 30113 intersects with the extension direction of the second channel 30114. In this embodiment, the extension direction of the first channel 30113 is perpendicular to the extension direction of the second channel 30114, so as to improve the cooling effect of the liquid cooling plate 3011 on the battery module 302.

[0140] In some embodiments, there are multiple first flow channels 30113 , and the multiple first flow channels 30113 are spaced apart in parallel along the length direction of the top plate portion 30111 , and the second flow channel 30114 is connected to the outermost first flow channel 30113 .

[0141] Specifically, as shown in FIG10 , the first flow channel 30113 is provided on the top plate portion 30111, and the first flow channel 30113 is provided in plurality, and the plurality of first flow channels 30113 are spaced apart in parallel along the length direction of the top plate portion 30111, that is, the length of a single first flow channel 30113 is the same as the width of the top plate portion 30111. When the liquid cooling plate 3011 cools the battery module 302, the liquid flows in the first flow channel 30113. The first flow channel 30113 is relatively short and can be evenly distributed throughout the entire top plate portion 30111 in a short time. , improving the cooling effect on the top of the battery module 302, and multiple first flow channels 30113 are spaced parallel to each other along the length direction of the top plate 30111, so that the first flow channel 30113 transfers heat more evenly, improving the temperature equalization effect of the liquid cooling plate 3011 on the battery module 302, and the second flow channel 30114 is connected to the first flow channel 30113 located on the outermost side, so that the liquid can flow through the first flow channel 30113 to the second flow channel 30114, and then the side plate 30112 can be cooled and the temperature can be equalized.

[0142] In some embodiments, there are multiple second flow channels 30114 , and the multiple second flow channels 30114 are spaced apart in parallel along the width direction of the top plate portion 30111 .

[0143] Specifically, as shown in Figure 10, a portion of the second flow channel 30114 is located on the top plate 30111 and the other portion is located on the side plate 30112, and the second flow channel 30114 is provided in plurality, and the plurality of second flow channels 30114 are spaced apart in parallel along the width direction of the top plate 30111, and the flow direction of the liquid in the second flow channel 30114 is perpendicular to the flow direction of the liquid in the first flow channel 30113. When the liquid cooling plate 3011 cools the battery module 302, the liquid flows in the second flow channel 30114, and the second flow channel 30114 is evenly distributed on the side plate 30112, so that the liquid in the second flow channel 30114 can be distributed to the entire side plate 30112 in a short time, thereby improving the cooling effect on the side of the battery module 302, and the plurality of second flow channels 30114 make the heat transfer more uniform, thereby improving the temperature uniformity effect of the liquid cooling plate 3011 on the battery module 302.

[0144] In some embodiments, a first thermally conductive structural adhesive 305 is provided between the top plate portion 30111 and the battery module 302; and / or, a pole 306 is provided on the side of the battery module 302, the pole 306 is connected to a bus 307, and a second thermally conductive structural adhesive 308 is provided between the side plate portion 30112 and the bus 307.

[0145] Specifically, as shown in Figures 9 and 10, a first thermally conductive structural adhesive 305 is provided between the top plate 30111 of the liquid cooling plate 3011 and the battery module 302. The top plate 30111 of the liquid cooling plate 3011 and the battery module 302 can be bonded by the first thermally conductive structural adhesive 305, and the first thermally conductive structural adhesive 305 can also perform operations such as heat transfer. When the liquid circulates in the first flow channel 30113, the heat of the battery module 302 can be transferred to the first flow channel 30113 through the first thermally conductive structural adhesive 305, and then exchange heat with the liquid in the first flow channel 30113.

[0146] Optionally, a pole 306 is provided on the side of the battery module 302, and the pole 306 is connected to a bus 307. A second thermally conductive structural adhesive 308 is provided between the side plate 30112 and the bus 307. The bus 307 can be connected to the side plate 30112 through the second thermally conductive structural adhesive 308. The second thermally conductive structural adhesive 308 can perform operations such as heat transfer. When the liquid circulates in the second flow channel 30114, the heat of the battery module 302 can be transferred to the second flow channel 30114 through the second thermally conductive structural adhesive 308, and then exchange heat with the liquid in the second flow channel 30114 to achieve cooling and temperature equalization of the pole 306.

[0147] In some embodiments, the battery pack 30100 further includes: a reinforcement 30115 , which is installed on the top of the top plate 30111 near the edge of the side plate 30112 , and the reinforcement 30115 extends outward to protrude from the side plate 30112 .

[0148] Specifically, as shown in Figure 9, the battery pack 30100 is also provided with a reinforcement 30115. The reinforcement 30115 is installed on the top of the top plate portion 30111 near the edge of the side plate portion 30112, and is connected to the top of the top plate portion 30111 near the edge of the side plate portion 30112 by bonding, screwing or welding. The reinforcement 30115 extends outward to protrude from the side plate portion 30112, so that when the top of the battery pack 30100 is bumped, its external force first acts on the reinforcement 30115, thereby protecting the liquid cooling plate 3011 and preventing the liquid cooling plate 3011 from being hit, etc., which may cause the flow channel to rupture, and then cause liquid overflow, posing a safety hazard.

[0149] In some embodiments, the explosion-proof valve protection member 3010 includes a support area 30103 and an avoidance area. The avoidance area is provided with an avoidance groove 30101 on the side facing the battery module 302. The support area 30103 is supported on the bottom of the battery module 302 and a buffer groove is formed on the side facing the bottom guard plate assembly 303.

[0150] Specifically, as shown in Figure 9, the battery pack 30100 is provided with a bottom guard plate assembly, which includes a bottom guard plate assembly 303 and an explosion-proof valve protection component 3010. The explosion-proof valve protection component 3010 is supported between the bottom guard plate assembly 303 and the battery module 302, and is connected to the bottom of the battery module 302 through structural adhesive 30104, etc. The explosion-proof valve protection component 3010 includes a support area 30103 and an avoidance area. The avoidance area is provided with an avoidance groove 30101 on the side facing the battery module 302. The high-pressure gas inside the battery pack 30100 can be exhausted along the avoidance groove 30101, thereby avoiding excessive pressure in the battery pack 30100 and improving the safety of the battery pack 30100.

[0151] Optionally, the support area 30103 of the explosion-proof valve protection component 3010 is supported on the bottom of the battery module 302, and the support area 30103 is formed with a buffer groove on the side facing the bottom guard plate assembly 303. The buffer groove can play a role in buffering and absorbing energy, thereby increasing the rigidity of the support area 30103. When the bottom guard plate assembly 303 is subjected to external impact force, the energy generated by the impact can be effectively absorbed by the bottom guard plate assembly, thereby protecting the explosion-proof valve 304, thereby protecting the entire battery module 302.

[0152] In some embodiments, as shown in Figure 9, an elastic energy-absorbing member 30102 is provided in the buffer groove. The elastic energy-absorbing member 30102 can be made of square microporous foam or honeycomb foam, and the elastic energy-absorbing member 30102 can be designed as a solid structure or a honeycomb structure, so that the elastic energy-absorbing member 30102 has good impact resistance and can effectively absorb the energy generated by the impact. When the bottom guard plate assembly 303 is subjected to external impact force, the force acts on the bottom guard plate assembly 303, and is transmitted to the elastic energy-absorbing member 30102 through the bottom guard plate assembly 303. The elastic energy-absorbing member 30102 is used for buffering and absorbing energy, thereby weakening the effect of the force, thereby protecting the explosion-proof valve 304, and thus protecting the entire battery module 302.

[0153] In some embodiments, there are multiple battery modules 302 and explosion-proof valve protection components 3010 in a one-to-one correspondence, and a box longitudinal beam 309 is connected between two adjacent explosion-proof valve protection components 3010 .

[0154] Specifically, as shown in Figure 9, there are multiple battery modules 302, and multiple explosion-proof valve protection parts 3010 are also set to multiple, and multiple battery modules 302 and multiple explosion-proof valve protection parts 3010 correspond one to one, thereby improving the protection effect of the battery module 302. At the same time, a box longitudinal beam 309 is connected between two adjacent explosion-proof valve protection parts 3010 to further improve the overall strength of the bottom guard plate assembly. Among them, the assembly structure of the overall bottom guard plate assembly can be matched and selected according to the requirements of different battery packs 30100.

[0155] The following describes a battery pack 40100 according to an embodiment of the present application with reference to Figures 11 to 15. A battery module 4011 is arranged inside a battery case 401, an explosion-proof valve 4012 is arranged at the bottom of the battery module 4011, and a bottom guard plate assembly 402 is arranged at the bottom of the battery case 401, so that the whole is an upper and lower structure. The bottom guard plate assembly 402 is arranged to improve the overall bottom protection performance of the battery pack 40100, and the exhaust channel 40221 is arranged to discharge the gas generated inside in time, thereby reducing the possibility of thermal runaway.

[0156] As shown in FIG. 11 , a battery pack 40100 according to an embodiment of the present application includes a battery box 401 and a bottom guard plate assembly 402 .

[0157] A battery module 4011 is installed in the battery box 401. It should be noted that the bottom guard plate assembly 402 in this application is installed at the bottom of the battery box 401. The battery box 401 can be constructed as a ring-shaped frame structure with open top and bottom. The bottom guard plate assembly 402 is used to protect and seal the bottom of the battery box 401. An explosion-proof valve 4012 is provided at the bottom of the battery module 4011. The explosion-proof valve 4012 is used to relieve pressure in the battery module 4011. In actual design, multiple explosion-proof valves 4012 can be provided at the bottom of the battery module 4011, so that the multiple explosion-proof valves 4012 correspond to the multiple battery cells in the battery module 4011 respectively. When thermal runaway or fire occurs in any of the battery cells, the pressure can be relieved and the air can be exhausted through the corresponding explosion-proof valve 4012, thereby avoiding the problem of excessive internal air pressure in the battery module 4011 and causing large-scale thermal runaway, maintaining the internal stability of the battery pack 40100, ensuring its sustainable normal use, and extending its service life.

[0158] The bottom guard plate assembly 402 includes a bottom guard plate 4022 and a module bottom plate 4021. The bottom guard plate 4022 is connected to the bottom of the battery case 401. This can be attached to the bottom of the battery case 401 using adhesive bonding or double-sided adhesive bonding to increase connection strength and, in turn, the overall rigidity of the battery pack 40100. The bottom guard plate 4022 can be constructed of HC340 / 590DP high-strength steel or higher, or hot-formed steel. Using high-strength steel increases overall rigidity and significantly enhances the protective performance of the bottom guard plate 4022.

[0159] The module bottom plate 4021 is supported between the battery module 4011 and the bottom guard plate 4022. Thus, the module bottom plate 4021 is located below the battery module 4011 and the explosion-proof valve 4012, so that the module bottom plate 4021 can protect the battery module 4011 and the explosion-proof valve 4012 together with the bottom guard plate 4022, thereby forming an overall protection at the bottom of the battery pack 40100, which can effectively absorb impact and improve the bottom safety of the battery pack 40100.

[0160] Optionally, the module base plate 4021 is provided with a relief hole 40211, which is arranged directly opposite the explosion-proof valve 4012. The bottom guard plate 4022 is provided with an exhaust channel 40221, which is arranged to open toward the relief hole 40211. In other words, the exhaust hole can be positioned directly below the explosion-proof valve 4012 so that gas at the explosion-proof valve 4012 can flow downward into the exhaust hole. The exhaust hole is open toward the exhaust channel 40221 of the bottom guard plate 4022, allowing gas to enter the exhaust channel 40221 from the exhaust hole and be exhausted to the outside through the exhaust channel 40221. Thus, when the battery pack 40100 is overpressured or overheated and the explosion-proof valve 4012 opens, the internal high-pressure or high-temperature gas can quickly enter the exhaust hole and then be discharged to the outside of the battery pack 40100 through the exhaust channel 40221, reducing the risk of heat diffusion and improving the safety of the battery pack 40100. In addition, the explosion-proof valve 4012 is arranged at the bottom of the battery module 4011, and there is no need to set up a separate space for exhaust on the side or top of the battery module 4011. The hollow cavity formed inside the module bottom plate 4021 can be used for exhaust, which can realize a compact design within the battery pack 40100 and help increase the energy density of the battery pack 40100.

[0161] Specifically, the avoidance hole 40211 is provided on the module bottom plate 4021, and the exhaust channel 40221 is provided on the bottom guard plate 4022. This can fully utilize the structural space on both the module bottom plate 4021 and the bottom guard plate 4022, thereby improving space utilization. Furthermore, when the bottom guard plate 4022 is connected to the battery case 401, the exhaust channel 40221 can be connected to the pressure relief valve on the battery case 401, facilitating the timely discharge of gas from the exhaust channel 40221 through the pressure relief valve, thereby achieving rapid gas discharge. Furthermore, in actual design, an insulating sheet or other structure can be attached to the exhaust channel 40221 to effectively isolate the battery module 4011, preventing damage, ensuring its normal operation, and extending its service life.

[0162] According to the battery pack 40100 of the embodiment of the present application, by setting a bottom guard plate assembly 402 at the bottom of the battery box 401, the cooperation between the module bottom plate 4021 and the bottom guard plate 4022 can effectively absorb the impact force, thereby protecting the explosion-proof valve 4012 and the battery module 4011, and improving the overall structural strength of the bottom of the battery pack 40100. In addition, the explosion-proof valve 4012 is arranged at the bottom of the battery module 4011, and the exhaust channel 40221 of the bottom guard plate 4022 can be used for exhaust. There is no need to set the exhaust channel 40221 on the top or side of the battery module 4011 as in the conventional battery pack 40100, thereby realizing a compact internal design and helping to improve the energy density of the battery pack 40100. At the same time, the exhaust holes in the module bottom plate 4021 and the exhaust channel 40221 of the bottom guard plate 4022 can promptly and quickly discharge the gas generated inside, thereby reducing the probability of thermal runaway and further improving the overall safety of the battery pack 40100.

[0163] In some embodiments, the module bottom plate 4021 is provided with an open avoidance groove 40212 on a side facing the bottom guard plate 4022. The avoidance groove 40212 is directly opposite the exhaust channel 40221, and the avoidance hole 40211 is provided on the top wall of the avoidance groove 40212. In other words, the avoidance groove 40212 and the exhaust channel 40221 are directly opposite and open toward each other, meaning that both the avoidance groove 40212 and the exhaust channel 40221 can serve as exhaust channels to achieve exhaust, thereby increasing the cross-sectional area of ​​the exhaust channel and the exhaust volume.

[0164] As shown in Figures 11-13, the avoidance groove 40212 is arranged on the lower side of the module bottom plate 4021, and the avoidance groove 40212 is open downward, the exhaust channel 40221 is arranged on the upper side of the bottom guard plate 4022, and the exhaust channel 40221 is open upward, and at the same time, the avoidance hole 40211 is arranged on the top wall of the avoidance groove 40212. Therefore, when thermal runaway occurs in the battery module 4011, the high-temperature gas inside can break through the explosion-proof valve 4012 and enter the avoidance groove 40212 downward from the avoidance hole 40211. At this time, part of the gas can be discharged from the avoidance groove 40212 toward the pressure relief valve, and the other part can flow into the exhaust channel 40221 and be discharged toward the pressure relief valve at the same time as the avoidance groove 40212, thereby effectively increasing the exhaust volume, allowing the internal gas to quickly enter the exhaust channel 40221 from top to bottom and be discharged, which has the effect of quickly reducing the pressure or temperature inside the battery pack 40100.

[0165] In some embodiments, there are multiple avoidance holes 40211, each corresponding one-to-one to a plurality of explosion-proof valves 4012. The multiple avoidance holes 40211 are spaced apart along the length of the avoidance slot 40212. It is understood that in actual use, multiple explosion-proof valves 4012 can be provided, each corresponding one-to-one to a battery cell. This allows for timely pressure relief and exhaust from the corresponding explosion-proof valve 4012 when thermal runaway occurs in any battery cell, thereby preventing widespread runaway of the battery module 4011. Accordingly, multiple avoidance holes 40211 corresponding one-to-one to each explosion-proof valve 4012 should also be provided to provide space for the installation of the explosion-proof valve 4012 and facilitate its installation. Furthermore, the avoidance holes 40211 are spaced apart along the length of the avoidance slot 40212, meaning that each corresponding explosion-proof valve 4012 is also spaced apart, thereby better ensuring the stability of the explosion-proof valve 4012's function.

[0166] Specifically, as shown in Figures 11 to 13, the module bottom plate 4021 is located between the battery module 4011 and the bottom guard plate 4022, the explosion-proof valve 4012 is located at the bottom of the battery module 4011, and an avoidance groove 40212 is provided on the module bottom plate 4021. An avoidance hole 40211 is provided on the top wall of the avoidance groove 40212. The avoidance hole 40211 is arranged opposite to the explosion-proof valve 4012 and corresponds one to one to avoid the installation position of the explosion-proof valve 4012.

[0167] In some embodiments, the module base plate 4021 further includes at least two support areas 40213, with an escape groove 40212 defined between two adjacent support areas 40213. A first buffer support member 404 is provided between the support areas 40213 and the battery module 4011. In other words, the module base plate 4021 is provided with support areas 40213 that can be used to define the escape groove 40212. Specifically, each two adjacent support areas 40213 can define an escape groove 40212, allowing airflow at the escape hole 40211 to flow from between the two support areas 40213 to the exhaust channel 40221.

[0168] At the same time, a first buffer support 404 is provided between the support area 40213 and the battery module 4011. The first buffer support 404 is provided to buffer the pressure from the outside and reduce the vibration that may be caused, thereby protecting the battery module 4011 and the explosion-proof valve 4012, and providing support to the interior to make the structure more stable and not easy to deform.

[0169] Exemplarily, as shown in Figures 11 to 13, the module base plate 4021 is provided with five support areas 40213, and the five support areas 40213 define four avoidance grooves 40212. A first buffer support member 404 is provided above the support area 40213, wherein the first buffer support member 404 can be designed as a solid or honeycomb structure, such as MPP square microporous foam, MPP honeycomb foam, etc.

[0170] In some embodiments, a plurality of buffer cavities 402131 are formed within the support region 40213, with adjacent buffer cavities 402131 separated by a partition rib 402132. As shown in Figures 11-13, a plurality of buffer cavities 402131 are formed within the support region 40213 of the module base plate 4021, with adjacent buffer cavities 402131 separated by a partition rib 402132. The partition rib 402132 provides a certain degree of support for the buffer cavities 402131. Furthermore, the buffer cavities 402131 are designed as hollow cavities, allowing for different functions to be performed.

[0171] Specifically, the buffer cavity 402131 can directly adopt a cavity structure, or it can have built-in buffering energy-absorbing materials to buffer the pressure from the outside, and can reduce internal vibrations, thereby playing a certain protective role for the battery module 4011 and the explosion-proof valve 4012, or the buffer cavity 402131 can be directly designed as a liquid cooling cavity, such as with built-in phase change materials, so as to cool the bottom of the battery module 4011. The module bottom plate 4021 can realize support, cooling or buffering energy absorption and other functions according to actual conditions. Users can flexibly choose the functions to be realized in actual use, so that the battery pack 40100 can be suitable for different scenarios, increasing the scope of application.

[0172] In some embodiments, the sidewalls connecting the buffer cavity 402131 and the avoidance groove 40212 and / or at least one of the separating ribs 402132 are configured as inclined reinforcing plates. That is, one of the two sidewalls connecting each avoidance groove 40212 and the buffer cavity 402131 can be configured as an inclined reinforcing plate, or both can be configured as inclined reinforcing plates. The reinforcing plates are inclined relative to the vertical direction so that when the battery pack 40100 is impacted at the bottom, the impact force is not transmitted upward along the reinforcing plates, thereby effectively dispersing the force and preventing the force from acting upward on the battery module 4011. Thus, the design of the inclined reinforcing plates not only enhances the overall strength of the structure, but also disperses the impact force at the bottom, acting as a buffer to prevent deformation, thereby providing protection for the battery module 4011 and the explosion-proof valve 4012.

[0173] For example, as shown in Figures 11-13, the two side walls connecting the avoidance groove 40212 and the buffer cavity 402131 are designed as inclined reinforcement plates. The setting of the reinforcement plates makes the structure more stable, thereby improving the overall structural strength of the battery pack 40100, and also protects the battery module 4011 and the explosion-proof valve 4012.

[0174] In some embodiments, a cooling medium or buffer material is provided in the buffer cavity 402131. Specifically, the buffer cavity 402131 can be filled with a cooling medium to provide cooling for the lower portion of the battery module 4011, thereby rapidly reducing the internal temperature. Alternatively, the buffer cavity 402131 can be filled with a buffer material to absorb external pressure, thereby achieving the purpose of vibration reduction and further protecting the battery module 4011 and the explosion-proof valve 4012.

[0175] Specifically, as shown in Figures 11 to 13, the module base plate 4021 includes a support area 40213, which limits the avoidance groove 40212, and a buffer cavity 402131 is formed in the support area 40213. The buffer cavities 402131 are separated by partition ribs 402132. The function of the buffer cavity 402131 depends on the filler selected by the user during actual use. If the battery module 4011 needs to be cooled, a built-in phase change material can be selected, and the buffer cavity 402131 can be designed as a liquid cooling plate 403. If it is required to play a vibration reduction role, a built-in buffer energy-absorbing material can be selected. The function of the buffer cavity 402131 will be different depending on the selected material. Flexible selection of contents can increase the scope of application of the battery pack 40100.

[0176] In some embodiments, the bottom guard plate 4022 further includes a buffer groove spaced apart from the exhaust channel 40221, within which a second buffer support member 405 is located. As shown in FIG11 , a bottom guard plate 4022 is provided at the bottom of the battery case 401. The bottom guard plate 4022 includes a buffer groove spaced apart from the exhaust channel 40221, which is used to exhaust gas from the battery pack 40100. The buffer groove may include a second buffer support member 405.

[0177] Specifically, a second buffer support member 405 is provided in the buffer groove so that when the bottom guard plate 4022 is impacted by an external force, the force is first applied to the second buffer support member 405. The second buffer support member 405 can cushion the impact through its own elastic deformation, preventing the impact force from acting on the module bottom plate 4021 and causing deformation thereof, thereby providing protection for the battery module 4011 and the explosion-proof valve 4012. The second buffer support member 405 can be made of the same material as the first buffer support member 404, or other buffering materials.

[0178] In some embodiments, as shown in FIG11-FIG12 and FIG14, the buffer slot includes a first buffer slot 402221 and a second buffer slot 402222. The first buffer slot 402221 is open on the side of the bottom guard plate 4022 facing away from the module bottom plate 4021, and the second buffer slot 402222 is open on the side of the bottom guard plate 4022 facing the module bottom plate 4021. That is, the buffer slots on the bottom guard plate 4022 include two types, namely the first buffer slot 402221 and the second buffer slot 402222. The first buffer slot 402221 and the second buffer slot 402222 are both open in one direction and in opposite directions. Specifically, the first buffer slot 402221 is open on the side facing away from the module bottom plate 4021, and the second buffer slot 402222 is open on the side facing the module bottom plate 4021.

[0179] Specifically, as shown in Figure 11, a bottom guard plate 4022 is connected to the bottom of the battery box 401, and an exhaust channel 40221 and a buffer groove are provided on the bottom guard plate 4022. The first buffer groove 402221 and the second buffer groove 402222 of the buffer groove are open in different directions, and both have a second buffer support 405 built in.

[0180] It should be noted that the exhaust channel 40221 corresponding to the explosion-proof valve 4012 is composed of an I-shaped groove in the bottom guard plate 4022. If the Z-direction exhaust space is to be increased during thermal runaway, an elastic part can be added to the bottom of the exhaust channel 40221. This can not only increase the exhaust space, but also prevent the battery pack 40100 from making abnormal noises as a whole.

[0181] In some embodiments, the battery case 401 further includes a liquid cooling plate 403, which is mounted on top of the battery case 401 and has a thermally conductive structural adhesive 406 disposed between the liquid cooling plate 403 and the battery module 4011. It should be noted that the battery case 401 can be designed as a circular frame structure open at the top and bottom, with a bottom guard plate 4022 used to improve bottom protection. The liquid cooling plate 403 is disposed on the top to provide support for the entire structure and cool the battery module 4011.

[0182] It is understood that the function of the liquid cooling plate 403 is to cool the battery module 4011. Specifically, when a reaction occurs within the battery pack 40100, causing the temperature to become too high, the liquid cooling plate 403 can lower the internal temperature. Specifically, the liquid cooling plate 403 is mounted on the top of the battery case 1, thereby lowering the internal temperature from the top. Simultaneously, the buffer cavity 402131 can be directly designed as a liquid cooling cavity, simultaneously cooling the battery module 4011 from both the top and bottom. Furthermore, a thermally conductive structural adhesive 406 is provided between the liquid cooling plate 403 and the battery module 4011. The thermally conductive structural adhesive 406 has excellent thermal conductivity, allowing the internal temperature to be quickly transferred, thereby accelerating the cooling rate and improving the cooling efficiency.

[0183] Among them, the liquid cooling plate 403 arranged on the top of the battery box 1 can not only cool the battery module 4011, but also provide support for the battery pack 40100 as a whole; and the thermal conductive structural adhesive 406 between the liquid cooling plate 403 and the battery box 401 can not only realize the rapid conduction of temperature, but also play the role of connecting the liquid cooling plate 403 and the battery box 401, so as to make the structure more stable and not easy to be damaged.

[0184] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0185] In the description of this application, “plurality” means two or more.

[0186] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0187] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0188] Throughout this specification, reference to terms such as "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 present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0189] Although the embodiments of the present application 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 intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A battery box, wherein a battery module is arranged in the battery box, and an explosion-proof valve is arranged at the bottom of the battery module; The bottom guard plate assembly includes a liquid cooling plate and a bottom guard plate assembly, wherein the liquid cooling plate is installed at the bottom of the battery module, the bottom guard plate assembly is connected to the bottom of the battery box and supported at the bottom of the liquid cooling plate, the liquid cooling plate is provided with a cooling channel and an avoidance groove, the avoidance groove is directly opposite to the explosion-proof valve, and the bottom guard plate assembly is provided with an exhaust channel connected to the avoidance groove.

2. The battery pack according to claim 1, characterized in that: The liquid cooling plate includes a bottom plate portion and a side plate portion, the bottom plate portion and the side plate portion are connected by bending and are both provided with the cooling channel, the bottom plate portion is located at the bottom of the battery module, and the side plate portion is located at the side of the battery module.

3. The battery pack according to claim 2, characterized in that: The cooling channel includes a first channel and a second channel, the extension direction of the first channel intersects with the extension direction of the second channel, the first channel is arranged on the bottom plate, a part of the second channel is located on the bottom plate and another part is located on the side plate.

4. The battery pack according to claim 3, characterized in that: The avoidance groove is parallel to and spaced apart from the first flow channel.

5. The battery pack according to claim 2, characterized in that: A first heat-conducting structural adhesive is provided between the bottom plate and the battery module; And / or, a pole is provided on a side of the battery module, the pole is connected to a bus bar, and a second heat-conducting structural adhesive is provided between the side plate and the bus bar.

6. The battery pack according to claim 2, characterized in that: The liquid cooling plate is provided with an avoidance hole and a communicating hole, the avoidance hole is arranged opposite to the explosion-proof valve, the avoidance hole and the communicating hole are communicated with the avoidance groove respectively, and the avoidance groove is communicated with the exhaust channel through the communicating hole.

7. The battery pack according to claim 6, characterized in that: Each battery module has a plurality of explosion-proof valves, and there are a plurality of avoidance holes corresponding one-to-one to the plurality of explosion-proof valves, and the plurality of avoidance holes are spaced and distributed along the extension direction of the avoidance groove.

8. The battery pack according to claim 1, characterized in that: The bottom guard plate assembly is also provided with a buffer cavity spaced apart from the exhaust passage.

9. The battery pack according to claim 8, characterized in that: The bottom guard plate assembly is provided with a buffer member between the area where the buffer cavity is located and the liquid cooling plate.

10. The battery pack according to claim 8 or 9, characterized in that: The battery modules and the liquid cooling plates are both multiple and correspond one to one; The buffer cavity comprises a side buffer cavity and a middle buffer cavity. The side buffer cavity is located at the bottom of the battery module, and the middle buffer cavity is located at the bottom of the connection between two adjacent battery modules.

11. A battery pack, characterized in that: include: A battery box, wherein a battery module is installed in the battery box, and an explosion-proof valve is provided at the bottom of the battery module; A bottom guard plate assembly, the bottom guard plate assembly comprising a first liquid cooling plate and a bottom guard plate, the bottom guard plate being connected to the bottom of the battery box, the first liquid cooling plate being located between the battery module and the bottom guard plate, and the first liquid cooling plate being provided with an avoidance hole directly facing the explosion-proof valve; A second liquid cooling plate, wherein the second liquid cooling plate and the first liquid cooling plate are both provided with cooling channels, and the second liquid cooling plate is installed on the top of the battery box and is used to cool the top and side of the battery module.

12. The battery pack according to claim 11, characterized in that: An exhaust space is defined between the bottom guard plate and the first liquid cooling plate, and the exhaust space is communicated with the avoidance hole.

13. The battery pack according to claim 12, characterized in that: A buffer is provided in the exhaust space, and the buffer is supported between the bottom guard plate and the first liquid cooling plate.

14. The battery pack according to claim 11, characterized in that: The second liquid cooling plate includes a top plate portion and a side plate portion, the top plate portion and the side plate portion are connected by bending and are both provided with the cooling channel, the top plate portion is located at the top of the battery module, and the side plate portion is located at the side of the battery module.

15. The battery pack according to claim 14, characterized in that: A first heat-conducting structural adhesive is provided between the top plate and the battery module; And / or, the side of the battery module is provided with a pole, the pole is connected to a bus bar, and the side plate portion is connected to the bus bar. A second thermal conductive structural adhesive is provided in between.

16. The battery pack according to claim 14, characterized in that: The cooling channel includes a first channel and a second channel, the extension direction of the first channel intersects with the extension direction of the second channel, the first channel is arranged on the top plate, and a part of the second channel is located on the top plate and another part is located on the side plate.

17. The battery pack according to claim 14, characterized in that: Also includes: A reinforcement member is installed on the top of the top plate portion near the edge of the side plate portion, and the reinforcement member extends outward to protrude from the side plate portion to be connected to the battery box body.

18. The battery pack according to claim 14, characterized in that: The liquid cooling plate further comprises an intermediate plate portion, the intermediate plate portion being connected to the lower side surface of the top plate portion, and the intermediate plate portion being parallel and spaced apart from the side plate portion; There are at least two battery modules, and the middle plate extends between two adjacent battery modules to cool the sides of the battery modules.

19. The battery pack according to claim 11, characterized in that: The battery box body also includes a box body side wall, and the box body side wall is provided with a buffer cavity, and the buffer cavity includes a plurality of buffer sub-cavities.

20. The battery pack according to claim 11, characterized in that: It also includes a box longitudinal beam, the battery modules and the first liquid cooling plates are multiple and distributed one-to-one, the box longitudinal beam is connected between two adjacent first liquid cooling plates, and the ends of two adjacent battery modules close to each other are supported on the box longitudinal beam.

21. A battery pack, characterized in that: include: A battery box, wherein a battery module is installed in the battery box, and an explosion-proof valve is provided at the bottom of the battery module; A bottom guard plate assembly, the bottom guard plate assembly comprising a bottom guard plate assembly and an explosion-proof valve protection member, the bottom guard plate assembly being connected to the bottom of the battery box, the explosion-proof valve protection member being supported between the bottom guard plate assembly and the battery module, and the explosion-proof valve protection member being provided with an avoidance groove directly facing the explosion-proof valve; A liquid cooling plate is installed on the top of the battery box, and a cooling channel is provided in the liquid cooling plate for cooling the top and sides of the battery module.

22. The battery pack according to claim 21, characterized in that: The liquid cooling plate includes a top plate portion and a side plate portion, the top plate portion and the side plate portion are connected by bending and are both provided with the cooling channel, the top plate portion is located at the top of the battery module, and the side plate portion is located at the side of the battery module.

23. The battery pack according to claim 22, characterized in that: The cooling channel includes a first channel and a second channel, the extension direction of the first channel intersects with the extension direction of the second channel, the first channel is arranged on the top plate, and a part of the second channel is located on the top plate and another part is located on the side plate.

24. The battery pack according to claim 23, characterized in that: There are a plurality of first flow channels, and the plurality of first flow channels are spaced apart in parallel along a length direction of the top plate portion, and the second flow channel is communicated with the first flow channel located at the outermost side.

25. The battery pack according to claim 23, characterized in that: There are a plurality of second flow channels, and the plurality of second flow channels are parallel and spaced apart along a width direction of the top plate.

26. The battery pack according to claim 22, characterized in that: A first heat-conducting structural adhesive is provided between the top plate and the battery module; And / or, a pole is provided on a side of the battery module, the pole is connected to a bus bar, and a second heat-conducting structural adhesive is provided between the side plate and the bus bar.

27. The battery pack according to claim 22, characterized in that: Also includes: A reinforcement member is installed at the top of the top plate portion near the edge of the side plate portion, and the reinforcement member extends outward to protrude from the side plate portion.

28. The battery pack according to claim 21, characterized in that: The explosion-proof valve protection component includes a supporting area and an escape area. The escape area is provided with the escape groove on a side facing the battery module. The supporting area is supported on the bottom of the battery module and is formed with a buffer groove on a side facing the bottom guard plate assembly.

29. The battery pack according to claim 28, characterized in that: An elastic energy absorbing member is arranged in the buffer groove.

30. The battery pack according to claim 21, characterized in that: There are multiple battery modules and explosion-proof valve protection parts, which correspond to each other one by one. A box longitudinal beam is connected between two adjacent explosion-proof valve protection parts.

31. A battery pack, characterized in that: include: A battery box, wherein a battery module is installed in the battery box, and an explosion-proof valve is provided at the bottom of the battery module; A bottom guard plate assembly, the bottom guard plate assembly comprising a bottom guard plate and a module bottom plate, the bottom guard plate being connected to the bottom of the battery box, The module bottom plate is supported between the battery module and the bottom guard plate. The module bottom plate is provided with an avoidance hole, which is arranged opposite to the explosion-proof valve. The bottom guard plate is provided with an exhaust passage, which is opened toward the avoidance hole.

32. The battery pack according to claim 31, characterized in that: The module bottom plate is provided with an open avoidance groove on a side facing the bottom guard plate, the avoidance groove is directly opposite to the exhaust passage, and the avoidance hole is provided on the top wall of the avoidance groove.

33. The battery pack according to claim 32, characterized in that: There are a plurality of avoidance holes corresponding one-to-one to the plurality of explosion-proof valves, and the plurality of avoidance holes are distributed at intervals along the length direction of the avoidance groove.

34. The battery pack according to claim 32, characterized in that: The module bottom plate further includes at least two supporting areas, and the avoidance groove is defined between two adjacent supporting areas, and a first buffer support is provided between the supporting area and the battery module.

35. The battery pack according to claim 34, characterized in that: A plurality of buffer cavities are formed in the support area, and two adjacent buffer cavities are separated by a partition rib.

36. The battery pack according to claim 35, characterized in that: The side wall of the buffer chamber connected to the avoidance groove and / or at least one of the partition ribs is configured as an inclined reinforcement plate.

37. The battery pack according to claim 35, characterized in that: A cooling medium or a buffer material is arranged in the buffer cavity.

38. The battery pack according to claim 31, characterized in that: The bottom guard plate is also provided with a buffer groove spaced apart from the exhaust passage, and a second buffer support is provided in the buffer groove.

39. The battery pack according to claim 38, characterized in that: The buffer groove comprises a first buffer groove and a second buffer groove, wherein the first buffer groove is open at a side of the bottom guard plate away from the module bottom plate, and the second buffer groove is open at a side of the bottom guard plate toward the module bottom plate.

40. The battery pack according to claim 31, characterized in that: Also includes: A liquid cooling plate is installed on the top of the battery box, and a heat-conducting structural adhesive is provided between the liquid cooling plate and the battery module.

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