Battery pack, battery pack assembly, and power device

Abstract

A battery pack (100), a battery pack assembly (300), and a power device. The battery pack (100) comprises: a battery case (1), wherein battery modules (11) are mounted in the battery case (1), and explosion-proof valves (3) are arranged at the bottom of each battery module (11); and a bottom protection plate assembly (2) comprising a bottom protection plate component (21) and explosion-proof valve protection members (22), wherein the bottom protection plate component (21) is connected to the bottom of the battery case (1), the explosion-proof valve protection members (22) are supported between the bottom protection plate component (21) and the battery modules (11), each explosion-proof valve protection member (22) is provided with a hollow chamber (222) and exhaust holes (221), each exhaust hole (221) is arranged directly opposite to the corresponding explosion-proof valve (3), each exhaust hole (221) is in communication with at least part of the hollow cavity (222), and at least part of the hollow chamber (222) is configured to be in communication with space outside the battery pack (100). According to the battery pack (100), the explosion-proof valves (3) can be arranged to face downward, the bottom protection plate assembly (2) is arranged to protect the battery pack (100) to a certain extent, thereby improving the bottom protection performance of the battery pack (100), and the explosion-proof valves (3) and the exhaust holes (221) are arranged to discharge generated gas, thereby reducing the probability of thermal runaway.

Description

Battery packs, battery pack assemblies and power units

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on August 29, 2023, with application number 202322327044.2 and invention name “Battery Pack”, the priority to the Chinese patent application filed with the China Patent Office on August 29, 2023, with application number 202322327067.3 and invention name “Battery Pack”, and the priority to the Chinese patent application filed with the China Patent Office on August 29, 2023, with application number 202322346107.9 and invention name “Battery Pack Assembly and Power Device”, all of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery pack, a battery pack assembly, and a power device. Background Art

[0004] Electric vehicles have become a common mode of transportation for people's daily commute. While driving, electric vehicles encounter various complex operating conditions. To improve the battery pack's ability to cope with these conditions, the pack's structural strength must be enhanced. The design of the battery pack structure directly impacts the pack's overall structural strength and safety performance. Currently, battery packs are arranged in a variety of ways. These typically have the cell poles facing upward, with the explosion-proof valve facing upward; or the cell poles facing one or both sides, with the explosion-proof valve on the same side as the poles. These two cell arrangements are relatively common, but they are not yet perfect for improving overall pack energy density and preventing thermal runaway. Furthermore, the battery pack's vibration and bottom protection are also inadequate, leaving room for improvement.

[0005] With the increasing focus on safety performance and energy, battery pack structures have become diverse, and as the energy density of battery packs continues to increase, highly integrated battery pack structures have become particularly important.

[0006] Summary of the Invention

[0007] 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 by providing a bottom guard plate assembly, and reduce the risk of thermal runaway by providing a vent hole in the explosion-proof valve protection member.

[0008] 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, the explosion-proof valve protection member is provided with a hollow cavity and an exhaust hole, the exhaust hole is arranged opposite to the explosion-proof valve, the exhaust hole is connected to at least part of the hollow cavity, and at least part of the hollow cavity is suitable for connecting with the external space of the battery pack.

[0009] 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 explosion-proof valve protection member and the bottom guard plate assembly cooperate to effectively absorb impact forces, thereby protecting the explosion-proof valve and battery module and improving the overall structural strength of the bottom of the battery pack. Furthermore, by disposing the explosion-proof valve at the bottom of the battery module, the hollow cavity within the explosion-proof valve protection member 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 and hollow cavity in the explosion-proof valve protection member can promptly and quickly exhaust internally generated gases, reducing the probability of thermal runaway and further improving the overall safety of the battery pack.

[0010] According to a battery pack of one embodiment of the present application, the hollow cavity includes an exhaust cavity and a functional cavity, the top wall of the exhaust cavity is provided with the exhaust hole, the exhaust cavity is suitable for communicating with the external space of the battery pack, and the functional cavity and the exhaust cavity are constructed with side walls connected and separated by inner cavities.

[0011] According to a battery pack of one embodiment of the present application, the functional cavity includes a first sub-cavity and a second sub-cavity, there are at least two first sub-cavities, the second sub-cavity is located between two adjacent first sub-cavities, and the first sub-cavity is connected to the exhaust cavity.

[0012] According to a battery pack of one embodiment of the present application, the vertical depth of the first sub-cavity is smaller than the vertical depth of the second sub-cavity, and / or the vertical depth of the second sub-cavity is the same as the vertical depth of the exhaust cavity.

[0013] According to a battery pack according to one embodiment of the present application, the side walls of the second sub-cavity and / or the exhaust cavity are configured as inclined reinforcing plates.

[0014] According to a battery pack according to one embodiment of the present application, the reinforcing plate includes an upper sub-plate and a lower sub-plate, an angle is formed between the upper sub-plate and the lower sub-plate, and the angle between the upper sub-plate and the vertical direction is the same as the angle between the lower sub-plate and the vertical direction.

[0015] According to a battery pack of one embodiment of the present application, a buffer is provided between the bottom of the first sub-cavity and / or the second sub-cavity and the bottom guard plate assembly.

[0016] According to the battery pack of one embodiment of the present application, the functional cavity is filled with a buffer material or a cooling medium.

[0017] According to a battery pack of one embodiment of the present application, there are multiple battery modules, and there are multiple explosion-proof valve protection members that are supported one-to-one on the bottom of the multiple battery modules, and a support member is connected between two adjacent explosion-proof valve protection members.

[0018] According to a battery pack according to one embodiment of the present application, a plurality of reinforcement cavities are formed in the side walls of the battery box.

[0019] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, another object of the present application is to provide a battery pack that significantly improves and enhances the bottom protection performance of the battery cell explosion-proof valve facing downward.

[0020] 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 assembly and an explosion-proof valve protection plate, the bottom guard plate assembly is connected to the bottom of the battery box, the explosion-proof valve protection plate is installed on the bottom guard plate assembly, the explosion-proof valve protection plate includes a support area and an avoidance area, the support area is suitable for supporting the bottom wall of the battery module, and the avoidance area is arranged directly opposite the explosion-proof valve.

[0021] According to the battery pack of the embodiment of the present application, the explosion-proof valve of the battery pack is set at the bottom of the battery module, and an explosion-proof valve protection plate is set at the bottom of the battery module. The explosion-proof valve protection plate includes a support area and an avoidance area. The support area is connected to the battery module to support the battery module, and the avoidance area is opposite to the explosion-proof valve, thereby protecting the explosion-proof valve. At the same time, the avoidance area also provides a channel for gas discharge when thermal runaway occurs in the battery module.

[0022] According to the battery pack of an embodiment of the present application, the explosion-proof valve protection plate is constructed as a corrugated plate, and the explosion-proof valve protection plate is formed with a buffer groove on the side of the support area facing the bottom guard plate assembly, and the explosion-proof valve protection plate is formed with an avoidance groove on the side of the avoidance area facing the battery module.

[0023] According to the battery pack of an embodiment of the present application, an exhaust hole is provided on the side wall between the avoidance groove and the buffer groove, the avoidance groove forms a first exhaust channel connected to the explosion-proof valve, and a second exhaust channel is formed in the buffer groove, and the second exhaust channel is connected to the first exhaust channel through the exhaust hole.

[0024] According to the battery pack of the embodiment of the present application, there are multiple support areas and multiple avoidance areas, and the multiple support areas and the multiple avoidance areas are staggeredly distributed on the explosion-proof valve protection plate.

[0025] According to the battery pack of the embodiment of the present application, a buffer member is provided in the buffer slot.

[0026] According to the battery pack of an embodiment of the present application, the bottom guard plate assembly also includes a middle support member, there are at least two battery modules, there are at least two explosion-proof valve protection plates, and they are installed one-to-one on the bottom of at least two battery modules, and the middle support member is connected between two adjacent explosion-proof valve protection plates.

[0027] According to the battery pack of the embodiment of the present application, the ends of two adjacent battery modules are spaced apart and respectively supported on both side edges of the middle support member.

[0028] According to the battery pack of an embodiment of the present application, the bottom guard plate assembly also includes a side support member, which includes a support plate and a connecting plate that are bent and connected to each other. The support plate is supported on the bottom of the battery module, and the connecting plate is located on the side of the battery module and is connected to the inner side wall of the battery box.

[0029] According to the battery pack of an embodiment of the present application, a buffer cavity is formed in the side wall of the battery case, and a first reinforcement member is provided in the buffer cavity; and / or a hollow reinforcement structure is further provided on the outside of the battery case, and a second reinforcement member is provided in the reinforcement structure.

[0030] According to an embodiment of the present application, the battery pack further includes a liquid cooling plate, which is installed on the upper part of the battery case and connected to the battery module. The liquid cooling plate is formed with an annular reinforcing flange, and the annular reinforcing flange is connected to the battery case.

[0031] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, another object of the present application is to provide a battery pack assembly that can ensure its safety performance and reduce the risk of loss of control.

[0032] The present application also proposes a power device having the above-mentioned battery pack assembly.

[0033] According to the battery pack assembly of the present application, it includes: a battery cell, an explosion-proof valve is formed at the bottom end of the battery cell; a support member, a first exhaust channel is formed on the support member and is arranged opposite to the explosion-proof valve; a bottom guard plate, the bottom guard plate is arranged on a side of the support member away from the battery cell and is fixedly connected to the support member, and a second exhaust channel is formed on the side of the bottom guard plate facing the support member, and the first exhaust channel is connected to the second exhaust channel.

[0034] According to the battery pack assembly of the present application, the battery pack assembly has a first exhaust channel and a second exhaust channel. When the battery suffers thermal runaway, the explosion-proof valve can discharge the gas in the battery in time, and the discharged gas can pass through the first exhaust channel and the second exhaust channel in sequence to be discharged to the outside world, thereby effectively reducing the temperature and pressure inside the battery pack assembly, ensuring the safety performance of the battery pack assembly, and reducing the risk of battery pack assembly runaway.

[0035] In some embodiments of the present application, the support member includes: a first support portion, which is arranged opposite to the battery cell and fixedly connected to the battery cell; a second support portion, which is arranged opposite to the explosion-proof valve and fixedly connected to the first support portion, and a first exhaust channel is formed on the second support portion.

[0036] In some embodiments of the present application, the second supporting portion includes: a bottom plate; side plates, the side plates are arranged on both sides of the bottom plate in a first direction and extend in a direction away from the bottom plate; overlapping edges, the overlapping edges are arranged at free ends of the side plates and extend in directions away from each other, the overlapping edges are fixedly connected to the first supporting portion, and the bottom plate, the side plates and the overlapping edges define the first exhaust channel.

[0037] In some embodiments of the present application, the battery pack assembly further includes: a first buffer member and a second buffer member, the first buffer member and the second buffer member are respectively located between the bottom guard plate and the support member and fixedly connected to the bottom guard plate and the support member, the first buffer member is arranged opposite to the first support portion, and the second buffer member is arranged opposite to the overlapping edge.

[0038] In some embodiments of the present application, the battery cell is constructed in plurality and the explosion-proof valves of the plurality of battery cells are spaced apart in a second direction, the second direction is orthogonal to the first direction, and the first exhaust channel extends in the second direction.

[0039] In some embodiments of the present application, a plurality of mounting grooves are formed on the bottom guard plate, the mounting grooves are suitable for accommodating the support member, and a second exhaust channel is formed between the bottom wall of the mounting groove and the support member.

[0040] In some embodiments of the present application, a reinforcing rib protruding toward the support member is formed in the installation groove, and the reinforcing rib is constructed in multiple numbers and is spaced apart in the first direction and the second direction respectively.

[0041] In some embodiments of the present application, the battery pack assembly further includes: an insulating member, which is disposed between the second supporting portion and the battery cell and is bonded and fixed to the second supporting portion.

[0042] In some embodiments of the present application, the battery pack assembly further includes: a liquid cooling plate, which is arranged at the top of the battery cell and connected to the battery cell, and a flow channel suitable for the flow of cooling liquid is formed on the liquid cooling plate.

[0043] The power device according to the present application is briefly described below.

[0044] The power device according to the present application is provided with the battery pack assembly of the above-mentioned embodiment. Since the power device of the present application is provided with the battery pack assembly of the above-mentioned embodiment, when thermal runaway occurs in the battery cell, the explosion-proof valve of the power device can discharge the gas inside the battery pack assembly in time, and the discharged gas can pass through the first exhaust channel and the second exhaust channel in sequence to be discharged to the outside world, thereby effectively reducing the pressure inside the battery pack assembly, reducing the risk of battery pack assembly loss of control, and ensuring the safety performance of the battery pack assembly and the power device.

[0045] 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

[0046] 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:

[0047] FIG1 is a schematic structural diagram of a battery pack according to an embodiment of the present application;

[0048] FIG2 is a schematic structural diagram of an explosion-proof valve, an explosion-proof valve protection member, and a bottom guard plate of a battery pack according to an embodiment of the present application;

[0049] FIG3 is a schematic structural diagram of an explosion-proof valve protection component of a battery pack according to an embodiment of the present application;

[0050] FIG4 is a schematic cross-sectional view of point A in FIG3 ;

[0051] FIG5 is a schematic diagram showing the dimensions of various parts of an explosion-proof valve protection member according to an embodiment of the present application;

[0052] FIG6 is an exploded view of a battery pack according to an embodiment of the present application;

[0053] FIG7 is a partial exploded view of a battery pack according to an embodiment of the present application;

[0054] FIG8 is a partial exploded view of the battery pack excluding the battery box according to an embodiment of the present application;

[0055] FIG9 is a top view of a battery pack according to an embodiment of the present application;

[0056] FIG10 is a cross-sectional view of the battery pack of FIG4 taken along line AA according to an embodiment of the present application;

[0057] FIG11 is a partial structure of FIG5 according to an embodiment of the present application;

[0058] FIG12 is a schematic structural diagram of a battery pack assembly according to an embodiment of the present application;

[0059] FIG13 is a schematic structural diagram of some parts of the battery pack assembly in FIG1 ;

[0060] FIG14 is a schematic structural diagram of the bottom guard plate of the battery pack assembly in FIG1 ;

[0061] FIG15 is a schematic structural diagram of a portion of the bottom guard plate of the battery pack assembly in FIG1 ;

[0062] FIG16 is a schematic structural diagram of a bottom guard plate according to a second embodiment of the present application.

[0063] 1 , a bottom guard plate 211 , a bottom guard plate 212 , an explosion-proof valve protection member 22 , an exhaust hole 221 , a hollow cavity 222 , an exhaust cavity 2221 , a functional cavity 2222 , a first sub-cavity 2223 , a second sub-cavity 2224 , an explosion-proof valve 3 , a buffer member 4 ; 2 , a battery pack 200 , a battery module 201 , an explosion-proof valve 202 , a structural adhesive 203 , an explosion-proof valve protection plate 204 , a support area 41 , an avoidance area 42 , an exhaust hole 43 , an insulating plate 44 , a buffer member 5 , a middle support member 6 , a side support member 7 , a support plate 71 , a connecting plate 72 , a side wall 8 of the box body , a buffer cavity 81 , a first reinforcement member 811 , a reinforcement structure 82 , a second reinforcement member 821 , Bottom guard plate assembly 9, bottom guard plate 91, bottom guard plate coating 911, inspection cover 92, inspection cover coating 921, thermal conductive structural adhesive 10, liquid cooling plate 2011, annular reinforcement flange 111; 300, battery pack assembly; 110, battery cell; 111, explosion-proof valve; 120, support member; 121, first exhaust channel; 122, first support portion; 1221, extension portion; 123, second support portion; 1231, bottom plate; 1232, side plate; 1233, overlapping edge; 130, bottom guard plate; 131, second exhaust channel; 132, bottom guard plate coating; 133, mounting beam; 134, mounting groove; 135, bottom wall; 136, reinforcement rib; 140, first buffer member; 150, second buffer member 160, insulation member; 170, liquid cooling plate; 171, flow channel; 101, adhesive layer. DETAILED DESCRIPTION

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The following describes a battery pack 100 according to an embodiment of the present application with reference to Figures 1 to 5. An explosion-proof valve 3 is provided at the bottom of the battery module 11, and an exhaust hole 221 is provided on the explosion-proof valve protection member 22 to discharge internal gas, thereby reducing the probability of thermal runaway. At the same time, a bottom guard plate assembly 21 is provided to provide protection for the battery module 11 and the explosion-proof valve 3, thereby improving the protective performance of the bottom guard plate.

[0068] As shown in FIG1-FIG5 , a battery pack 100 according to one embodiment of the present application includes: a battery box 1 and a bottom guard plate assembly 2 .

[0069] A battery module 11 is installed in the battery case 1. It should be noted that the bottom guard plate assembly 2 in the present application is installed at the bottom of the battery case 1. The battery case 1 can be constructed as a ring-shaped frame structure with both the top and the bottom open. The bottom guard plate assembly 2 is used to protect and seal the bottom of the battery case 1. An explosion-proof valve 3 is provided at the bottom of the battery module 11. The explosion-proof valve 3 is used to relieve pressure on the battery module 11. In actual design, multiple explosion-proof valves 3 can be provided at the bottom of the battery module 11 so that the multiple explosion-proof valves 3 correspond to the multiple battery cells in the battery module 11. Therefore, when any of the battery cells experiences thermal runaway or fire, the corresponding explosion-proof valve 3 can be used to relieve pressure and exhaust, thereby avoiding the problem of excessive internal air pressure in the battery module 11 and causing large-scale thermal runaway.

[0070] In addition, a cover plate can be set on the top of the battery box 1 to block and close the top thereof. For example, the cover plate can be set as a liquid cooling plate 12. In this way, the liquid cooling plate 12 can be used not only to close the battery box 1, but also to quickly cool the battery module 11.

[0071] The bottom guard plate assembly 2 includes a bottom guard plate assembly 21 and an explosion-proof valve protection member 22. The bottom guard plate assembly 21 is connected to the bottom of the battery case 1. The bottom guard plate assembly 21 and the battery case 1 can be connected by gluing or double-sided partial adhesive, which increases the connection strength between the bottom guard plate 212 and the battery case 1, thereby enhancing the overall rigidity of the battery pack 100. Specifically, the bottom guard plate assembly 21 includes a bottom guard plate coating 211 and a bottom guard plate 212. The various parts of the bottom guard plate assembly 2 can be formed into a sandwich structure by gluing or double-sided partial adhesive, which can improve the overall structural rigidity. The bottom guard plate 212 can be made of HC340 / 590DP high-strength steel or higher, or hot-formed steel.

[0072] The explosion-proof valve protection component 22 is supported between the bottom guard plate assembly 21 and the battery module 11. Thus, the explosion-proof valve protection component 22 is located below the battery module 11 and the explosion-proof valve 3, so that the explosion-proof valve protection component 22 can protect the battery module 11 and the explosion-proof valve 3 together with the bottom guard plate assembly 2, thereby forming an overall protection at the bottom of the battery pack 100, which can effectively absorb the impact and improve the bottom safety of the battery pack 100.

[0073] The explosion-proof valve guard 22 is provided with a hollow cavity 222 and a vent 221. The vent 221 is positioned directly opposite the explosion-proof valve 3 and communicates with at least a portion of the hollow cavity 222. At least a portion of the hollow cavity 222 is adapted to communicate with the exterior of the battery pack. Specifically, the vent 221 can be positioned directly below the explosion-proof valve 3 so that airflow from the explosion-proof valve 3 can flow downward into the vent 221, then from there into at least a portion of the hollow cavity 222, where it can be exhausted toward the exterior of the battery pack 100. Consequently, when the battery pack 100 is overpressured or overheated and the explosion-proof valve 3 opens, the internal high-pressure or high-temperature gas can quickly enter the vent 221 and then be discharged from the central control chamber to the exterior of the battery pack 100, reducing the risk of heat diffusion and improving the safety of the battery pack 100. In addition, the explosion-proof valve 3 is arranged at the bottom of the battery module 11, and there is no need to set up a separate space for exhaust on the side or top of the battery module 11. The hollow cavity 222 formed inside the explosion-proof valve protective member 22 can be used for exhaust, which can realize a compact design within the battery pack 100 and help increase the energy density of the battery pack 100.

[0074] Among them, at least part of the hollow cavity 222 is suitable for communicating with the external space of the battery pack 100. In other words, the hollow cavity 222 can be an integral cavity, so that the integral cavity is completely connected with the external space of the battery pack 100, so that the internal high-temperature and high-pressure gas can enter the hollow cavity 222 to achieve gas discharge, or the hollow cavity 222 can also be constructed to include multiple sub-cavities, and the multiple sub-cavities are spaced apart, one of the sub-cavities is connected to the exhaust hole 221, and the gas at the exhaust hole 221 can be discharged to the external space of the battery pack through the sub-cavity, and the other sub-cavities can be used to achieve buffering, cooling or other functions, and the structural setting is flexible.

[0075] According to the battery pack 100 of the embodiment of the present application, by disposing a bottom guard plate assembly 2 at the bottom of the battery case 1, the explosion-proof valve protection member 22 cooperates with the bottom guard plate assembly 21 to effectively absorb impact force, thereby protecting the explosion-proof valve 3 and the battery module 11 and improving the overall structural strength of the bottom of the battery pack 100. Furthermore, by disposing the explosion-proof valve 3 at the bottom of the battery module 11, the hollow cavity 222 within the explosion-proof valve protection member 22 can be used for exhaust. This eliminates the need for exhaust channels on the top or side of the battery module 11 as in conventional battery packs 100, achieving a compact internal design and facilitating improved energy density of the battery pack 100. Furthermore, the exhaust holes 221 and hollow cavity 222 in the explosion-proof valve protection member 22 can promptly and quickly exhaust internally generated gases, reducing the probability of thermal runaway and further improving the overall safety of the battery pack 100.

[0076] In some embodiments, the hollow cavity 222 includes an exhaust cavity 2221 and a functional cavity 2222. The top wall of the exhaust cavity 2221 is provided with a vent hole 221. The exhaust cavity 2221 is adapted to communicate with the exterior of the battery pack 100. The functional cavity 2222 and the exhaust cavity 2221 are configured such that their side walls are connected and their inner cavities are separated. In other words, the exhaust cavity 2221 is configured to communicate with the exterior of the battery pack 100 to discharge gases generated within the battery pack 100, thereby reducing the risk of thermal runaway of the battery pack 100. The functional cavity 2222 is separated from the exhaust cavity 2221 and is configured to perform a function different from exhaust. The functions of the two do not interfere with each other, thereby enriching the functions of the explosion-proof valve protection member 22 and meeting different usage requirements.

[0077] In actual design, the side walls of the functional cavity 2222 are interconnected with the side walls of the exhaust cavity 2221, so that the hollow cavity 222 is a whole and the internal structure is relatively neat. At the same time, the inner cavity of the functional cavity 2222 and the inner cavity of the exhaust cavity 2221 are two independent chambers completely separated from each other, ensuring that the functions of the two are independent of each other and do not interfere with each other. Specifically, the functional cavity 2222 can be set according to the different needs of the user during use. It can be directly set as a cavity, or a buffering energy-absorbing material can be placed inside the functional cavity 2222 to buffer external forces and improve the safety of the battery pack 100, or a cooling medium can be directly filled into the functional cavity 2222 to cool the lower part of the battery module 11, improve the cooling effect, and extend the service life of the battery pack 100.

[0078] Thus, users can flexibly configure the function of the functional cavity 2222 according to specific needs. It can be directly configured as an empty cavity or as a liquid cooling structure to cool the battery module 11. The diverse configurations facilitate the application of the battery pack 100 in different operating conditions, expanding the applicability of the battery pack 100. In addition, an insulating sheet or the like can be attached to the exhaust cavity 2221 to achieve insulation isolation from the internal medium.

[0079] Exemplarily, as shown in Figure 2, the functional cavity 2222 and the exhaust cavity 2221 are distributed in sequence in the length direction of the explosion-proof valve protection part 22, and the exhaust cavity 2221 is located directly below the explosion-proof valve 3, and the other cavities are functional cavities 2222. The number of exhaust cavities 2221 corresponds to the explosion-proof valve 3. If there are two groups of explosion-proof valves 3, the exhaust cavity 2221 is also set to two groups.

[0080] In some embodiments, the functional cavity 2222 includes a first sub-cavity 2223 and a second sub-cavity 2224, there are at least two first sub-cavities 2223, the second sub-cavity 2224 is located between two adjacent first sub-cavities 2223, and the first sub-cavity 2223 is connected to the exhaust cavity 2221. That is, the functional cavity 2222 further includes a first sub-cavity 2223 and a second sub-cavity 2224, wherein the number of first sub-cavities 2223 is multiple, the first sub-cavity 2223 is directly connected to the exhaust cavity 2221, and the second sub-cavity 2224 is separated from the exhaust cavity 2221 by the first sub-cavity 2223. In other words, the number of first sub-cavities 2223 is not less than two, and the second sub-cavity 2224 or the exhaust cavity 2221 is located between two adjacent first sub-cavities 2223.

[0081] For example, as shown in Figures 1 and 2, each explosion-proof valve guard 22 is provided with a second sub-cavity 2224, two exhaust cavities 2221, and four first sub-cavities 2223. The second sub-cavity 2224, two exhaust cavities 2221, and four first sub-cavities 2223 are staggered along the length of the explosion-proof valve 3. In actual design, the inner cavity of the first sub-cavity 2223 can be separated from the inner cavity of the second sub-cavity 2224 to form independent chambers. These chambers can then be used to achieve different functions, enriching the functionality of the explosion-proof valve guard 22. This allows the explosion-proof valve guard 22 to have an overall harmonica-like structure.

[0082] In some embodiments, the vertical depth of the first sub-cavity 2223 is less than the vertical depth of the second sub-cavity 2224, and / or the vertical depth of the second sub-cavity 2224 is the same as the vertical depth of the exhaust cavity 2221. In other words, the vertical depth of the second sub-cavity 2224 and the vertical depth of the exhaust cavity 2221 can be set to be the same, and both are greater than the vertical depth of the first sub-cavity 2223. It is understood that the explosion-proof valve protection member 22 is located at the bottom of the battery module 11, and the upper surface of the explosion-proof valve protection member 22 can be aligned with the lower surface of the battery module 11, and the upper surface of the explosion-proof valve protection member 22 is generally flush. In other words, the second sub-cavity 2224 and the exhaust cavity 2221 both protrude downwardly from the first sub-cavity 2223. In other words, during actual installation, the second sub-cavity 2224 and the exhaust cavity 2221 can be supported and contacted with the bottom guard plate assembly 21 before the first sub-cavity 2223.

[0083] Therefore, in actual design, the second sub-cavity 2224 and the vent cavity 2221 can both be configured to press against the bottom guard plate assembly 21, while the first sub-cavity 2223 is spaced apart from the bottom guard plate assembly 21. Thus, the second sub-cavity 2224 can be configured as a hollow cavity or a buffer cavity containing a cushioning material. In this way, when the bottom of the battery pack 100 is impacted, both the second sub-cavity 2224 and the vent cavity 2221 can collapse and deform, buffering the impact force and thus protecting the battery module 11 and the explosion-proof valve 3. The first sub-cavity 2223, on the other hand, does not directly contact the bottom guard plate assembly 21 and can be filled with coolant to cool the battery module 11. Furthermore, when the bottom of the battery pack 100 is impacted, the first sub-cavity 2223 is not directly affected by the force of the bottom guard plate assembly 21, making it less likely that the first sub-cavity 2223 will rupture and cause coolant to overflow. This effectively cools the battery module 11 and effectively prevents damage to the liquid cooling system.

[0084] For example, as shown in Figures 1-4 , the second sub-cavity 2224 and the exhaust cavity 2221 have the same vertical depth, and both are greater than the vertical depth of the first sub-cavity 2223. The upper surfaces of the second sub-cavity 2224, the exhaust cavity 2221, and the first sub-cavity 2223 are all flush, and the lower surfaces of the second sub-cavity 2224 and the exhaust cavity 2221 both protrude downward from the lower surface of the first sub-cavity 2223. In actual design, as shown in Figure 5 , the vertical depth dimension a of the first sub-cavity 2223 can be determined based on the bottom design space, and the vertical depth dimension b of the second sub-cavity 2224 is 0.85-1.5 times a, and can be designed to be 1 times a.

[0085] In some embodiments, the sidewalls of the second sub-cavity 2224 and / or the exhaust cavity 2221 are configured as inclined reinforcement plates. Specifically, the sidewalls of the second sub-cavity 2224 and / or the exhaust cavity 2221 are configured as inclined reinforcement plates. Thus, the sidewalls of the first sub-cavity 2223 connected to the second sub-cavity 2224 or the exhaust cavity 2221 are also inclined. The use of an inclined reinforcement plate design can disperse the bottom impact force, further protecting the battery module 11 and the explosion-proof valve 3, while also buffering deformation.

[0086] For example, as shown in Figures 1 to 4, the side walls of the second sub-cavity 2224 and the exhaust cavity 2221 are both constructed as inclined reinforcing plates, which are inclined relative to the vertical direction so that when the battery pack 100 is subjected to an impact force at the bottom, the force can be transmitted in a non-vertical direction at the reinforcing plate, thereby achieving effective force dispersion and avoiding the impact force acting vertically upward on the battery module 11. Therefore, through the design of the reinforcing plate, not only the overall strength of the structure can be enhanced, but also the impact force on the bottom can be dispersed, which plays a role in buffering deformation, and further protects the battery module 11 and the explosion-proof valve 3.

[0087] Specifically, as shown in Figure 5, the upper edge width e of the exhaust chamber 2221 can be determined according to the length of the explosion-proof valve 3, such as 0.95-1.45 times the length of the explosion-proof valve 3, and the lower edge width f of the exhaust chamber 2221 can be consistent with e; in addition, the upper edge width g of the second sub-cavity 2224 can be set to 1.35-1.85 times the length of the explosion-proof valve 3, and the lower edge width h can be consistent with g; further, i is 0.18-0.25 times the length of the battery cell, j is 0.35-0.55 times the length of the battery cell, and k is 0.70-0.85 times the length of the battery cell.

[0088] In some embodiments, the reinforcing plate includes an upper sub-plate and a lower sub-plate, with an angle formed between the upper and lower sub-plates, and the angle between the upper and lower sub-plates and the vertical direction is the same. That is, the upper and lower sub-plates are symmetrically arranged with respect to the horizontal plane. As shown in Figures 4 and 5 , the two horizontally opposing side walls of the exhaust cavity 2221 or the second sub-cavity 2224 are both configured as reinforcing plates, so that the exhaust cavity 2221 or the second sub-cavity 2224 is configured as a honeycomb hexagonal cavity.

[0089] As shown in Figures 4 and 5 , the upper and lower sub-plates are both tilted relative to the vertical, and the bottom wall of the first sub-cavity 2223 is connected to the joint between the upper and lower sub-plates, thereby splicing and connecting the three plate portions. Therefore, when the bottom of the battery pack 100 is impacted, the bottom wall of the exhaust cavity 2221 or the second sub-cavity 2224 transmits the impact force to the lower sub-plate, which then transmits the force upward in a direction tilted relative to the vertical. The lower sub-plate then disperses the impact force to the bottom wall of the first sub-cavity 2223 and the upper sub-plate, thereby dispersing the impact force in different directions and enhancing the bottom protection effect. Specifically, in an actual design, as shown in Figure 5 , the tilt angle c of the upper sub-plate can be set to 35-55 degrees, and the tilt angle d of the lower sub-plate can be consistent with c.

[0090] In some embodiments, a buffer member 4 is provided between the bottom of the first sub-cavity 2223 and / or the second sub-cavity 2224 and the bottom guard plate assembly 21. Specifically, a buffer member 4 is provided between the first sub-cavity 2223 and the bottom guard plate assembly 21, and a buffer member 4 may also be provided between the second sub-cavity 2224 and the bottom guard plate assembly 21. The buffer member 4 can be flexibly arranged according to the specific circumstances of actual use by the user. Thus, by providing the buffer member 4, a buffering effect can be provided between the first sub-cavity 2223 and the bottom guard plate assembly 21, and between the second sub-cavity 2224 and the bottom guard plate assembly 21. That is, when the bottom guard plate assembly 21 is subjected to a bottom impact force, the force can first be transmitted to the buffer member 4, where it is absorbed by the elastic deformation of the buffer member 4. This prevents the first sub-cavity 2223 and the second sub-cavity 2224 from being directly subjected to force and deformation, thereby improving the safety of the explosion-proof valve protection member 22.

[0091] For example, as shown in Figures 1 and 2, a buffer member 4 is provided at the bottom of the first sub-cavity 2223, and a buffer member 4 is also provided at the bottom of the second sub-cavity 2224, wherein the setting of the buffer member 4 can be used to reduce the vibration generated when a reaction occurs inside the battery pack 100, and can also be used to reduce the vibration generated when the battery pack 100 as a whole is hit by an external force, thereby improving the safety performance, wherein the buffer member 4 can be set to a solid structure or a honeycomb structure, such as the buffer member 4 can be made of MPP square microporous foam, MPP honeycomb foam, etc.

[0092] In some embodiments, the functional cavity 2222 is filled with a buffer material or a cooling medium. That is, during actual use, the functional cavity 2222 can be filled with either a buffer material or a cooling medium. The user can select the specific filling content based on their needs or actual conditions. This flexible selection of filling content increases the use scenarios of the battery pack 100 and expands the scope of application of the battery pack 100.

[0093] It should be noted that if there is no need to fill the functional cavity 2222 with buffer material or cooling medium, the functional cavity 2222 can also be designed as a cavity. In short, whether to fill the functional cavity 2222 and the choice of filler are relatively flexible, and the user only needs to choose as needed when using it.

[0094] In some embodiments, there are multiple battery modules 11, and multiple explosion-proof valve protection members 22 are supported on the bottoms of the multiple battery modules 11 in a one-to-one correspondence. Thus, by providing multiple battery modules 11, the capacity of the battery pack 100 is increased, thereby enhancing the battery pack 100's endurance. Furthermore, providing multiple explosion-proof valve protection members 22 can protect the bottoms of the multiple battery modules 11, allowing each battery module 11 to be protected and vented by its corresponding explosion-proof valve protection member 22, thereby improving the bottom safety and venting reliability of each battery module 11.

[0095] Among them, a support member is connected between two adjacent explosion-proof valve protection members 22, and the support member can realize the connection between the two adjacent explosion-proof valve protection members 22, so that each explosion-proof valve protection member 22 can be installed as a whole, which is conducive to improving the installation efficiency. When subjected to bottom impact force, force diffusion can also be achieved between each explosion-proof valve protection member 22, reducing local deformation and improving the overall safety of the battery pack 100.

[0096] For example, as shown in Figures 1 and 2, a battery pack 100 may include two battery modules 11, with an explosion-proof valve protection member 22 disposed at the bottom of each battery module 11. A support member is connected between the two explosion-proof valve protection members 22. The width of the support member is greater than the gap between the two battery modules 11, allowing the ends of both battery modules 11 to be supported by the support member. This allows the support member to support two adjacent battery modules 11, thereby allowing the support member to serve as a longitudinal beam within the battery box 1 to form a central support, thereby ensuring the internal stability of the battery pack 100.

[0097] In some embodiments, multiple reinforced cavities are formed in the side walls of the battery case 1. In other words, the side walls of the battery case 1 can be constructed as a hollow structure, and the reinforced cavities are separated by reinforcing ribs. Therefore, when the bottom of the battery pack 100 is subjected to an impact force, the impact force can be absorbed by the deformation of the reinforcing ribs toward the reinforced cavity, thereby improving the stability and reliability of the battery pack 100.

[0098] At the same time, it should be noted that multiple battery modules 11 are provided in the battery box 1. By setting a reinforced cavity, the overall weight of the battery pack 100 can be reduced, the problem of excessive overall weight of the battery pack 100 caused by setting multiple battery modules 11 can be reduced, and the overall performance of the battery pack 100 can be optimized.

[0099] The following describes a battery pack 200 according to an embodiment of the present application with reference to Figures 6 to 11. The explosion-proof valve 202 of the battery pack is arranged at the bottom of the battery module 201, and an explosion-proof valve protection plate 204 is arranged at the bottom of the battery module 201. The explosion-proof valve protection plate 204 includes a support area 41 and an avoidance area 42. The support area 41 is connected to the battery module 201 to support the battery module 201, and the avoidance area 42 is opposite to the explosion-proof valve 202, thereby protecting the explosion-proof valve 202. At the same time, the avoidance area 42 is also formed to provide a channel for gas discharge when thermal runaway occurs in the battery module 201.

[0100] As shown in FIG6-FIG11, the battery pack 200 according to the embodiment of the present application includes: a battery box and a bottom guard plate assembly.

[0101] Among them, a battery module 201 is installed in the battery box, and an explosion-proof valve 202 is provided at the bottom of the battery module 201. 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 by a roll-pressing process to reduce the overall weight. The side wall and the bottom guard plate assembly form an accommodating space, and the battery module 201 can be arranged in the accommodating space. Specifically, when the explosion-proof valve 202 is set, multiple explosion-proof valves 202 are spaced apart at the bottom of the battery module 201. The explosion-proof valve 202 and the pole can both be set at the bottom of the battery module 201, or the explosion-proof valve 202 can be set at the bottom of the battery module 201, and the pole can be set on the other side of the battery module 201. The explosion-proof valve 202 is set at the bottom of the battery cell of the battery module 201 and connected to the battery cell. In this way, the explosion-proof valve 202 exhausts downward to achieve thermal and electrical separation.

[0102] Furthermore, the bottom guard plate assembly includes a bottom guard plate assembly 9 and an explosion-proof valve protection plate 204. The bottom guard plate assembly 9 is connected to the bottom of the battery box, and the explosion-proof valve protection plate 204 is installed on the bottom guard plate assembly 9. When designing the explosion-proof valve protection plate 204, the areas where the multiple explosion-proof valves 202 at the bottom of the battery module 201 are located are protected. The support area 41 of the explosion-proof valve protection plate 204 is suitable for supporting the bottom wall of the battery module 201, that is, the explosion-proof valve protection plate 204 is connected and supported to the battery module 201 through the support area 41. The support area 41 of the explosion-proof valve protection plate 204 is bonded to the bottom of the battery module 201 by structural adhesive 203, and the avoidance area 42 is arranged directly opposite the explosion-proof valve 202.

[0103] At this time, the avoidance area 42 is directly opposite to the explosion-proof valve 202 connected to the bottom of the battery module 201. There is a avoidance space between the avoidance area 42 and the bottom of the battery module 201, so a gas discharge channel can be formed in the avoidance space. When the pressure of the battery module 201 increases, the explosion-proof valve 202 opens, and the high-pressure gas can flow toward the gas discharge channel, so that the explosion-proof valve 202 helps people solve safety hazards and effectively prevents new energy batteries from exploding during application.

[0104] Therefore, the explosion-proof valve protection plate 204 of the embodiment of the present application includes a support area 41 and an avoidance area 42. The support area 41 is connected to the battery module 201 to support the battery module 201, and the avoidance area 42 is opposite to the explosion-proof valve 202 to protect the explosion-proof valve 202. At the same time, the avoidance area 42 also provides a channel for gas discharge when thermal runaway occurs in the battery module 201. The embodiment of the present application adopts a lower-placed explosion-proof valve 202 arrangement and has sufficient protection function for the explosion-proof valve 202.

[0105] In some embodiments, the explosion-proof valve protection plate 204 is constructed as a corrugated plate, and a buffer groove is formed on the side of the support area 41 facing the bottom guard plate assembly 9 of the explosion-proof valve protection plate 204, and an avoidance groove is formed on the side of the avoidance area 42 facing the battery module 201 of the explosion-proof valve protection plate 204.

[0106] That is to say, the avoidance area 42 is formed with an avoidance groove, which is a gas discharge channel for the explosion-proof valve 202. The buffer groove and the avoidance groove are distributed at intervals, and the openings of the buffer groove and the avoidance groove are in opposite directions. Multiple explosion-proof valves 202 are arranged at intervals along the first direction of the battery module 201 at the bottom of the battery module 201. When the explosion-proof valve 202 and the pole are located on different sides, the length direction of the battery cell is perpendicular to the direction in which the multiple explosion-proof valves are distributed at intervals. The first direction is the direction of the width of the battery cell in the battery module 201, and the second direction is the length direction of the battery cell; the buffer groove and the avoidance groove of the corrugated plate are parallel and distributed at intervals. The length of the avoidance groove extends along the first direction of the explosion-proof valve 202 to protect each explosion-proof valve 202. The battery module 201 is bonded to the battery module 201 by the structural adhesive 203 on the side of the buffer groove close to the battery module 201.

[0107] When the buffer groove is bonded to the battery module 201 on the side facing away from the bottom guard plate assembly 9, the two buffer grooves are distributed on both sides of the avoidance groove and connected to the battery module 201, which can protect the explosion-proof valve 202 in both sides, and the avoidance groove of the explosion-proof valve protection plate 204 can protect the explosion-proof valve 202 in the direction opposite to the explosion-proof valve 202.

[0108] In some embodiments, an exhaust hole 43 is provided on the side wall between the avoidance groove and the buffer groove, and the avoidance groove forms a first exhaust channel connected to the explosion-proof valve 202. A second exhaust channel is formed in the buffer groove, and the second exhaust channel is connected to the first exhaust channel through the exhaust hole 43.

[0109] Specifically, a plurality of exhaust holes 43 are provided, and the plurality of exhaust holes 43 are spaced apart and arranged along the arrangement direction of each row of explosion-proof valves 202. A pressure relief valve is provided on the side wall of the battery case. When the pressure of the battery module 201 increases, the explosion-proof valve 202 opens, and the high-pressure gas is discharged to the first exhaust channel and the exhaust holes 43 at the same time. The first exhaust channel is connected to the exhaust holes 43, and the gas reaches the pressure relief valve through the first exhaust channel. The gas is discharged from the battery case through the pressure relief valve to protect the battery module 201.

[0110] In some embodiments, there are multiple support areas 41 and multiple avoidance areas 42 , and the multiple support areas 41 and the multiple avoidance areas 42 are staggeredly distributed on the explosion-proof valve protection plate 204 .

[0111] At this time, multiple support areas 41 and multiple avoidance areas 42 are spaced apart and parallel to each other, and multiple rows of explosion-proof valves 202 are arranged, and there are multiple explosion-proof valves 202 in each row. The multiple explosion-proof valves 202 in each row are directly opposite to the corresponding avoidance areas 42. By setting multiple support areas 41, the connection area between the battery module 201 and the explosion-proof valve protection plate 204 can be increased, thereby enhancing the reliability of the connection between the explosion-proof valve protection plate 204 and the battery module 201. The multiple avoidance areas 42 can avoid the multiple explosion-proof valves 202 in each row, so that the multiple explosion-proof valves 202 connected to the battery module 201 can be protected, and a gas flow channel for the explosion-proof valve 202 is formed.

[0112] In some embodiments, a buffer member 5 is provided within the buffer groove; this improves the buffering performance of the explosion-proof valve protection plate 204 when it is impacted by external forces, thereby enhancing the protection of the explosion-proof valve 202. The buffer member 5 is generally constructed of a structure such as MPP square microporous foam or a PP interlayer. The buffer member 5 can absorb energy and provide cushioning. When the bottom guard plate assembly is impacted by external forces, the overall bottom assembly can effectively absorb the impact, thereby protecting the explosion-proof valve 202 and thus providing safety protection for the entire battery cell. The buffer member 5 is typically designed as a solid structure or a honeycomb structure, providing excellent bottom impact resistance and energy absorption capabilities.

[0113] In some embodiments, the bottom guard plate assembly also includes a middle support member 6, there are at least two battery modules 201, there are at least two explosion-proof valve protection plates 204 and they are installed one-to-one at the bottom of at least two battery modules 201, and the middle support member 6 is connected between two adjacent explosion-proof valve protection plates 204.

[0114] In practice, when there are multiple battery modules 201, setting a middle support member 6 between adjacent battery modules 201 can play a reinforcing role. The battery pack 200 does not specifically set a crossbeam between the two battery modules 201, and the middle support member 6 at the bottom of the two battery modules 201 is equivalent to a crossbeam, thereby strengthening the entire battery pack; at the same time, the size of the explosion-proof valve protection plate 204 is the same as the size of the battery module 201, so one explosion-proof valve protection plate 204 can protect all the explosion-proof valves 202 at the bottom of the corresponding battery module 201.

[0115] Furthermore, a middle support member 6 is provided between adjacent explosion-proof valve protection plates 204, and adjacent battery modules 201 are connected through the middle support member 6, and no explosion-proof valve 202 is provided in the area above the middle support member 6, so the middle support member 6 can be flush with the surface of the buffer groove connecting the battery module 201, and the middle support member 6 also has the same function as the buffer groove. The middle support member 6 and the upper plane of the buffer groove on both sides are connected to form a middle support groove of the middle support member 6. The middle support groove is also provided with a buffer member 5, which can play a buffering role at the bottom of the adjacent battery modules 201. The middle support member 6 serves as a crossbeam, which can improve the vibration resistance of the adjacent battery modules 201, thereby enhancing the strength and vibration resistance effect of the battery pack.

[0116] In some embodiments, the ends of two adjacent battery modules 201 are spaced apart and supported on both side edges of the middle support member 6 .

[0117] As shown in Figure 10, that is to say, the distance between adjacent battery modules 201 is smaller than the width of the middle support member 6, and both ends of the middle support member 6 extend to the bottom of the two adjacent battery modules 201. The middle support member 6 can support and connect the bottoms of adjacent battery modules 201 close to each other, and the width of the middle support member 6 is greater than the distance between adjacent battery modules 201, which is equivalent to the support function and strength of the middle support member 6 when used as a crossbeam. It is improved, thereby enhancing the protection function of the entire battery pack, and further improving the protection function of the explosion-proof valve 202.

[0118] In some embodiments, the bottom guard plate assembly also includes a side support member 7, which includes a support plate 71 and a connecting plate 72 that are bent and connected to each other. The support plate 71 is supported on the bottom of the battery module 201, and the connecting plate 72 is located on the side of the battery module 201 and is connected to the inner wall of the battery box.

[0119] As shown in Figure 6, the side support member 7 is constructed as an L-shaped structure, which includes a support plate 71 and a connecting plate 72. Each explosion-proof valve protection plate 204 is connected to a side support member 7 at the end away from the middle support member 6. The side support member 7 is welded to the explosion-proof valve protection plate 204 and the battery box body. The connecting plate 72 of the side support member 7 protects and strengthens the side of the battery module 201, and the support plate 71 supports the bottom of the battery module 201. When the side wall of the battery pack is impacted, the side support member 7 has a better protection and reinforcement effect on the battery module 201, better protects the battery module 201, and thus better protects the explosion-proof valve 202.

[0120] Furthermore, local reinforcing ribs are provided on the inner side of the side support member 7, and the local reinforcing ribs are constructed to protrude along the inner corners of the L-shaped structure of the side support member 7. That is to say, the local reinforcing ribs can better reinforce the corners of the side support member 7. At this time, the corners of the battery module 201 can be better protected, especially when protecting the corners on the side with the explosion-proof valve 202, the explosion-proof valve 202 can be better protected.

[0121] In some embodiments, a buffer cavity 81 is formed in the side wall of the battery case, and a first reinforcement member 811 is provided in the buffer cavity 81; and / or a hollow reinforcement structure 82 is provided on the outside of the battery case, and a second reinforcement member 821 is provided in the reinforcement structure 82.

[0122] In practice, the first reinforcement 811 in the buffer cavity 81 can be U-shaped, and the first reinforcement 811 is set to two or more. For example, when the first reinforcement 811 is set to two, the U-shaped openings of the two first reinforcements 811 are both facing one side of the bottom guard plate 91 or the side away from the bottom guard plate 91. The two first reinforcements 811 divide the buffer cavity 81 into multiple sub-cavities, which can not only increase the strength of the buffer cavity 81, but also enable the buffer cavity 81 to have a certain buffering effect when it is subjected to external force impact or vibration, and at the same time reduce the weight of the battery pack.

[0123] Similarly, a hollow reinforcement structure 82 is provided on the outside of the battery case. The reinforcement structure 82 can be provided with a connecting hole. The battery pack can be fixed in a fixed position by passing the connecting member through the reinforcement structure 82, and a second reinforcement member 821 is provided in the reinforcement structure 82. The second reinforcement member 821 is also U-shaped. The U-shaped opening of the U-shaped second reinforcement member 821 faces the battery module 201, so that the U-shaped second reinforcement member 821 can support and strengthen the reinforcement structure 82, and also improve the overall rigidity of the battery case.

[0124] In some embodiments, the battery pack 200 of the embodiment of the present application also includes a liquid cooling plate 2011, which is installed on the upper part of the battery case and connected to the battery module 201. The liquid cooling plate 2011 is formed with an annular reinforcing flange 111, which is connected to the battery case.

[0125] In practice, as shown in Figures 6 and 8, the liquid cooling plate 2011 has the functions of cooling and equalizing the temperature of the battery cells and providing support. The thermal conductive structural adhesive 10 bonds the liquid cooling plate 2011 to the side of the battery module 201 away from the bottom guard plate assembly 9. The thermal conductive structural adhesive 10 can provide heat conduction and connection. The liquid cooling plate 2011 is connected to the side wall 8 of the box body by bolts or welding. The liquid cooling plate 2011 adopts a ring-shaped reinforced flange 111, and at the same time improves the side column collision performance of the entire battery pack.

[0126] In addition, an insulating plate 44 is bonded to one side of the explosion-proof valve protection plate 204, and the position of the insulating plate 44 is directly opposite the position of the explosion-proof valve 202. However, in the exploded view of the embodiment of the present application, the positions of the insulating plate 44 and the explosion-proof valve 202 are not shown as directly opposite each other. This is to facilitate the display and observation of the structure of the explosion-proof valve 202 and the insulating plate 44. In practice, the positions of the explosion-proof valve 202 and the insulating plate 44 are directly opposite each other, as shown in the cross-sectional view of Figure 11. The insulating plate 44 is generally made of a material such as a mica sheet or a ceramic sheet, while the explosion-proof valve protection plate 204 is a metal piece. The insulating piece is directly opposite the explosion-proof valve protection plate 204 to prevent arcing and short circuiting in the event of thermal runaway, thus providing insulation.

[0127] The battery pack 200 of the embodiment of the present application also includes a bottom guard plate 91. The bottom guard plate 91 is generally made of HC340 / 590DP high-strength steel or above, or hot-formed steel, etc. The bottom guard plate 91 is connected to an inspection cover 92. The bottom guard plate 91 is provided with a bottom guard plate coating 911, and the inspection cover 92 is provided with an inspection cover coating 921. By providing the bottom guard plate coating 911 and the inspection cover coating 921, the battery box can be protected from corrosion caused by the external environment.

[0128] That is, the bottom guard plate assembly 9 includes the bottom guard plate 91 and the inspection cover 92, the bottom guard plate coating 911, and the inspection cover coating 921, while the bottom guard plate assembly includes the explosion-proof valve protection plate 204, the bottom guard plate assembly 9, the middle support member 6 and the side support member 7, the insulating plate 44, and the buffer member 5. The battery pack 200 of the present embodiment adopts a battery pack with the explosion-proof valve 202 positioned below. The bottom guard plate assembly significantly improves the vibration performance and bottom protection performance of the entire battery pack, while also providing a channel for gas discharge in the event of thermal runaway of the battery cells. This overall structure is relatively lightweight, low-cost, and simple to manufacture, which can greatly shorten the battery pack performance verification cycle.

[0129] The following describes a battery pack assembly 300 according to an embodiment of the present application with reference to Figures 12 to 16. The battery pack assembly 300 includes a battery cell 110, a support member 120 and a bottom guard plate 130. An explosion-proof valve 111 is formed at the bottom end of the battery cell 110, and a first exhaust channel 121 is formed on the support member 120 and is arranged opposite to the explosion-proof valve 111. The bottom guard plate 130 is arranged on a side of the support member 120 away from the battery cell 110 and is fixedly connected to the support member 120. A second exhaust channel 131 is formed on the side of the bottom guard plate 130 facing the support member 120, and the first exhaust channel 121 is connected to the second exhaust channel 131.

[0130] In the related technology, current battery packs usually adopt an arrangement in which the cell poles and explosion-proof valves face upward, or the cell poles face one side or both sides, and the explosion-proof valve and poles are located on the same side. However, this arrangement is not perfect in terms of improving the energy density of the entire pack and thermal runaway of the battery cells.

[0131] As shown in FIG12 , specifically, the battery pack assembly 300 includes a battery cell 110, a support member 120, and a bottom guard plate 130. An explosion-proof valve 111 may be formed at the bottom end of the battery cell 110. The explosion-proof valve 111 can discharge gas from the battery cell 110 in the event of thermal runaway. Battery poles may be formed on one or both sides of the battery cell 110. The support member 120 may be disposed at the bottom end of the battery cell 110 and may be used to support the battery cell 110. The support member 120 and the battery cell 110 may be fixed by bonding. A first exhaust channel 121 may be formed on the support member 120. The first exhaust channel 121 may be directly opposite the explosion-proof valve 111 and may be used to exhaust gas from the explosion-proof valve 111.

[0132] The bottom guard plate 130 can be arranged on the side of the support 120 away from the battery cell 110, and the bottom guard plate 130 is bonded and fixed to the support 120. A second exhaust channel 131 is formed on the side of the bottom guard plate 130 facing the support 120. The second exhaust channel 131 can be connected to the first exhaust channel 121. When the battery cell 110 thermally runs away, the explosion-proof valve 111 can discharge gas, and the gas can be discharged through the first exhaust channel 121 and the second exhaust channel 131, thereby ensuring the safety performance of the battery cell 110 and reducing the risk of the battery cell 110 running out of control.

[0133] In short, the battery pack assembly 300 of the present application has a first exhaust channel 121 and a second exhaust channel 131. When thermal runaway occurs in the battery cell 110, the explosion-proof valve 111 can discharge the gas in the battery cell 110 in time, and the discharged gas can pass through the first exhaust channel 121 and the second exhaust channel 131 in turn to be discharged to the outside world, thereby effectively reducing the temperature and pressure inside the battery pack assembly 300, ensuring the safety performance of the battery pack assembly 300, and reducing the risk of loss of control of the battery pack assembly 300.

[0134] As shown in Figures 12 and 13, in some embodiments of the present application, the support member 120 includes a first support portion 122 and a second support portion 123. The first support portion 122 can be disposed opposite the battery cell 110 to support the battery cell 110. An adhesive layer 101 is formed between the first support portion 122 and the battery cell 110, and the first support portion 122 and the battery cell 110 are bonded and fixed via the adhesive layer 101. The first support portion 122 can be made of aluminum, steel, or a material with equivalent performance to enhance the structural strength of the second support portion 123. The first support portion 122 is further provided with extension portions 1221 on both sides of the first reverse direction, and the extension portions 1221 extend away from the first support portion 122. The side of the extension portion 1221 facing the bottom guard plate 130 is provided with an adhesive layer 101, and the extension portion 1221 and the bottom guard plate 130 are bonded and fixed via the adhesive layer 101.

[0135] The second support portion 123 can be arranged opposite to the explosion-proof valve 111, and a first exhaust channel 121 can be formed on the second support portion 123. The first support portion 122 and the second support portion 123 can be constructed in multiple forms, and the multiple first support portions 122 and the multiple second support portions 123 are arranged crosswise. The first support portion 122 and the second support portion 123 can be fixedly connected. The second support portion 123 can be composed of aluminum, steel, composite materials, etc., thereby improving the structural strength of the second support portion 123.

[0136] As shown in Figures 12 and 13, in some embodiments of the present application, the second support portion 123 includes a bottom plate 1231, a side plate 1232 and an overlapping edge 1233. The bottom plate 1231 can be arranged on a side of the second support portion 123 away from the battery cell 110, the side plates 1232 can be arranged on both sides of the bottom plate 1231 in the first direction, and the side plates 1232 extend in a direction away from the bottom plate 1231, the overlapping plates can be arranged at the free ends of the side plates 1232, and the two overlapping edges 1233 extend in directions away from each other, the overlapping edges 1233 can be fixedly connected to the first support portion 122, and the bottom plate 1231, the side plates 1232 and the overlapping edges 1233 can define the first exhaust channel 121, and the cavity formed between the bottom plate 1231 and the side plates 1232 can also have a buffering and energy absorption function. When the bottom guard plate 130 is subjected to external impact force, this structure can effectively absorb the impact energy, thereby protecting the explosion-proof valve 111.

[0137] As shown in Figures 12 and 13, in some embodiments of the present application, the battery pack assembly 300 further includes a first buffer 140 and a second buffer 150, the first buffer 140 and the second buffer 150 are respectively located between the bottom guard plate 130 and the support member 120, and the first buffer 140 and the second buffer 150 are respectively fixedly connected to the bottom guard plate 130 and the support member 120, wherein the first buffer 140 can be arranged opposite to the first support portion 122, and the second buffer 150 can be arranged opposite to the overlap edge 1233, and the first buffer 140 can be arranged opposite to the overlap edge 1233. 40 and the second buffer member 150 can be made of materials such as MPP square microporous foam, MPP honeycomb foam, etc. The first buffer member 140 and the second buffer member 150 can be constructed as a solid structure or a honeycomb structure, etc. Therefore, the first buffer member 140 and the second buffer member 150 have good bottom impact resistance and energy absorption functions. When the bottom guard plate 130 is subjected to external impact force, the first buffer member 140 and the second buffer member 150 can effectively absorb the energy generated by the impact, thereby protecting the explosion-proof valve 111 and providing safety protection for the entire battery cell 110.

[0138] As shown in Figures 12 and 13, in some embodiments of the present application, the battery cell 110 can be constructed in multiple numbers, the explosion-proof valve 111 can be constructed in multiple numbers corresponding to the multiple battery cells 110, and the multiple explosion-proof valves 111 can be arranged at intervals in the second direction, wherein the second direction is orthogonal to the first direction, and the first exhaust channel 121 can extend in the second direction, thereby ensuring that when the battery cell 110 thermally runs away, the explosion-proof valve 111 can discharge the gas to the first exhaust channel 121 more quickly.

[0139] As shown in Figures 14 and 15, in some embodiments of the present application, the bottom guard plate 130 can be made of HC340 / 590DP high-strength steel or higher, or hot-formed steel, thereby improving the overall strength of the bottom guard plate 130 and its anti-collision performance. The bottom end of the bottom guard plate 130 is also provided with a bottom guard plate coating 132. The bottom guard plate coating 132 has a structural improvement, can resist acid and alkali liquids, and can resist fire and wear. The bottom guard plate 130 is formed with a mounting beam 133, which divides the bottom guard plate 130 into a plurality of mounting slots 134. In a specific embodiment, the mounting slots 134 can be configured as four. Specifically, the mounting slots 134 can be used to accommodate the support member 120, and the bottom wall 135 of the mounting slot 134 can be a flat plate structure. A second exhaust channel 131 is formed between the bottom wall 135 and the support member 120.

[0140] As shown in Figure 16, in some embodiments of the present application, a reinforcing rib 136 protruding toward the support member 120 can be formed in the installation groove 134, and the reinforcing rib 136 is constructed in multiple, and the multiple reinforcing ribs 136 are respectively arranged at intervals in the first direction and the second direction. The reinforcing rib 136 can separate the second exhaust channel 131 into a transverse exhaust channel and a longitudinal exhaust channel. The transverse exhaust channel and the longitudinal exhaust channel are staggered to ensure that when the battery cell 110 is out of control, the high-temperature gas can be quickly discharged through the explosion-proof valve 111, thereby reducing the temperature and pressure of the entire battery pack assembly 300, and further reducing the risk of the battery pack assembly 300 being out of control.

[0141] As shown in Figures 12 and 13, in some embodiments of the present application, the battery pack assembly 300 also includes an insulating member 160. The insulating member 160 can be arranged between the second support portion 123 and the battery cell 110, and the insulating member 160 can be bonded and fixed to the second support portion 123. The insulating member 160 can also be arranged at the explosion-proof valve 111. The insulating member 160 can be constructed of materials such as mica sheets and ceramic sheets, thereby preventing short circuits between the positive and negative poles of the battery cell 110, improving the output efficiency of the battery cell 110 and the service life of the battery cell 110.

[0142] As shown in Figure 12, in some embodiments of the present application, the battery pack assembly 300 also includes a liquid cooling plate 170, which is arranged at the top of the battery cell 110, and the liquid cooling plate 170 can be fixedly connected to the battery cell 110. In a specific embodiment, the liquid cooling plate 170 and the battery cell 110 are fixed by an adhesive, and a flow channel 171 suitable for the flow of coolant can be formed on the liquid cooling plate 170. The liquid cooling plate 170 can cool the battery cell 110, and fixing the liquid cooling plate 170 to the top of the battery cell 110 with an adhesive can improve the thermal conductivity of the coolant.

[0143] The power device according to the present application is briefly described below.

[0144] The power device according to the present application is provided with the battery pack assembly 300 of the above-mentioned embodiment. Since the power device of the present application is provided with the battery pack assembly 300 of the above-mentioned embodiment, when thermal runaway occurs in the battery cell 110, the explosion-proof valve 111 can promptly discharge the gas in the battery pack assembly 300, and the discharged gas can pass through the first exhaust channel 121 and the second exhaust channel 131 in sequence to be discharged to the outside, thereby effectively reducing the pressure inside the battery pack assembly 300, reducing the risk of loss of control of the battery pack assembly 300, and ensuring the safety performance of the battery pack assembly 300 and the power device.

[0145] 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 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 assembly and an explosion-proof valve protection member, the bottom guard plate assembly is connected to the bottom of the battery box, the explosion-proof valve protection member is supported between the bottom guard plate assembly and the battery module, the explosion-proof valve protection member is provided with a hollow cavity and an exhaust hole, the exhaust hole is arranged opposite to the explosion-proof valve, the exhaust hole is communicated with at least part of the hollow cavity, and at least part of the hollow cavity is suitable for communicating with the external space of the battery pack.

2. The battery pack according to claim 1, characterized in that: The hollow cavity includes an exhaust cavity and a functional cavity. The exhaust hole is provided on the top wall of the exhaust cavity. The exhaust cavity is suitable for communicating with the external space of the battery pack. The functional cavity and the exhaust cavity are constructed with side walls connected and separated by inner cavities.

3. The battery pack according to claim 2, characterized in that: The functional cavity comprises a first sub-cavity and a second sub-cavity, there are at least two first sub-cavities, the second sub-cavity is located between two adjacent first sub-cavities, and the first sub-cavity is connected to the exhaust cavity.

4. The battery pack according to claim 3, characterized in that: The vertical depth of the first sub-cavity is smaller than the vertical depth of the second sub-cavity, and / or the vertical depth of the second sub-cavity is the same as the vertical depth of the exhaust cavity.

5. The battery pack according to claim 3, characterized in that: The side walls of the second sub-cavity and / or the exhaust cavity are configured as inclined reinforcing plates.

6. The battery pack according to claim 5, characterized in that: The reinforcing plate includes an upper sub-plate and a lower sub-plate, an angle is formed between the upper sub-plate and the lower sub-plate, and the angle between the upper sub-plate and the vertical direction is the same as the angle between the lower sub-plate and the vertical direction.

7. The battery pack according to claim 3, characterized in that: A buffer is provided between the bottom of the first sub-cavity and / or the second sub-cavity and the bottom guard plate assembly.

8. The battery pack according to claim 2, characterized in that: The functional cavity is filled with buffer material or cooling medium.

9. The battery pack according to claim 1, characterized in that: There are multiple battery modules, and there are multiple explosion-proof valve protection members, which are supported one by one on the bottom of the multiple battery modules, and a support member is connected between two adjacent explosion-proof valve protection members.

10. The battery pack according to claim 1, characterized in that: A plurality of reinforcement cavities are formed in the side wall of the battery box.

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; The bottom guard plate assembly includes a bottom guard plate assembly and an explosion-proof valve protection plate. The bottom guard plate assembly is connected to the bottom of the battery box. The explosion-proof valve protection plate is installed on the bottom guard plate assembly. The explosion-proof valve protection plate includes a supporting area and an avoidance area. The supporting area is suitable for supporting the bottom wall of the battery module. The avoidance area is arranged directly opposite to the explosion-proof valve.

12. The battery pack according to claim 11, characterized in that: The explosion-proof valve protection plate is constructed as a corrugated plate, and a buffer groove is formed on the side of the support area facing the bottom guard plate assembly, and an avoidance groove is formed on the side of the avoidance area facing the battery module.

13. The battery pack according to claim 12, characterized in that: An exhaust hole is provided on the side wall between the avoidance groove and the buffer groove, the avoidance groove forms a first exhaust channel connected to the explosion-proof valve, a second exhaust channel is formed in the buffer groove, and the second exhaust channel is connected to the first exhaust channel through the exhaust hole.

14. The battery pack according to claim 12, characterized in that: There are multiple support areas and multiple avoidance areas, and the multiple support areas and the multiple avoidance areas are staggeredly distributed on the explosion-proof valve protection plate.

15. The battery pack according to claim 12, characterized in that: A buffer member is arranged in the buffer groove.

16. The battery pack according to claim 11, characterized in that: The bottom guard plate assembly also includes a middle support member, there are at least two battery modules, there are at least two explosion-proof valve protection plates and they are installed one-to-one at the bottom of at least two battery modules, and the middle support member is connected between two adjacent explosion-proof valve protection plates.

17. The battery pack according to claim 16, characterized in that: The ends of two adjacent battery modules are spaced apart and are respectively supported on the two side edges of the middle support member.

18. The battery pack according to claim 11, characterized in that: The bottom guard plate assembly also includes a side support member, which includes a support plate and a connecting plate that are bent and connected to each other. The support plate is supported on the bottom of the battery module, and the connecting plate is located on the side of the battery module and is connected to the inner wall of the battery box.

19. The battery pack according to claim 11, characterized in that: A buffer cavity is formed in the side wall of the battery box, and a first reinforcement member is arranged in the buffer cavity; And / or, a hollow reinforcement structure is further provided on the outer side of the battery box, and a second reinforcement member is provided inside the reinforcement structure.

20. The battery pack according to claim 11, characterized in that: It also includes a liquid cooling plate, which is installed on the upper part of the battery case and connected to the battery module. The liquid cooling plate is formed with an annular reinforcing flange, and the annular reinforcing flange is connected to the battery case.

21. A battery pack assembly, characterized in that: include: A battery cell, wherein an explosion-proof valve is formed at the bottom end of the battery cell; A support member, wherein the support member is formed with a first exhaust passage arranged directly opposite to the explosion-proof valve; A bottom guard plate is arranged on a side of the support member away from the battery cell and is fixedly connected to the support member, a second exhaust channel is formed on a side of the bottom guard plate facing the support member, and the first exhaust channel is connected to the second exhaust channel.

22. The battery pack assembly according to claim 21, characterized in that: The support member comprises: A first support portion, wherein the first support portion is arranged opposite to the battery core and is fixedly connected to the battery core; The second supporting part is arranged opposite to the explosion-proof valve and is fixedly connected to the first supporting part. A first exhaust channel is formed on the second supporting part.

23. The battery pack assembly according to claim 22, characterized in that: The second supporting portion comprises: Base plate; Side plates, the side plates are arranged on both sides of the bottom plate in a first direction and extend in a direction away from the bottom plate; The overlapping edges are arranged at the free ends of the side plates and extend in directions away from each other, the overlapping edges are fixedly connected to the first supporting portion, and the bottom plate, the side plates and the overlapping edges define the first exhaust channel.

24. The battery pack assembly according to claim 23, characterized in that: Also includes: A first buffer component and a second buffer component, wherein the first buffer component and the second buffer component are respectively located between the bottom guard plate and the support component and are fixedly connected to the bottom guard plate and the support component, the first buffer component is arranged opposite to the first supporting portion, and the second buffer component is arranged opposite to the overlapping edge.

25. The battery pack assembly according to claim 24, characterized in that: The battery cell is constructed in plurality and the explosion-proof valves of the plurality of battery cells are arranged at intervals in a second direction, the second direction is orthogonal to the first direction, and the first exhaust channel extends in the second direction.

26. The battery pack assembly according to claim 25, characterized in that: A plurality of mounting grooves are formed on the bottom guard plate, wherein the mounting grooves are suitable for accommodating the support member, and a second exhaust passage is formed between the bottom wall of the mounting groove and the support member.

27. The battery pack assembly according to claim 26, characterized in that: A reinforcing rib protruding toward the supporting member is formed in the installation groove, and the reinforcing rib is structured in multiple numbers and is respectively arranged at intervals in the first direction and the second direction.

28. The battery pack assembly according to claim 27, characterized in that: Also includes: An insulating member is disposed between the second supporting portion and the battery core and is bonded and fixed to the second supporting portion.

29. The battery pack assembly according to claim 21, characterized in that: Also includes: A liquid cooling plate is arranged at the top of the battery core and fixedly connected to the battery core, and a flow channel suitable for the flow of cooling liquid is formed on the liquid cooling plate.

30. A power device, characterized in that: A battery pack assembly comprising any one of claims 21-29.

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