Battery pack box and battery pack

Abstract

The application relates to the technical field of batteries and discloses a battery pack box body and a battery pack, which comprise a frame, a bottom guard plate, a protection plate and a cross beam; the bottom guard plate is arranged at the bottom of the frame and forms a containing cavity together with the frame; the cross beam is arranged in the frame; opposite sides of the bottom of the frame are respectively provided with first connecting beams extending towards each other; the bottom of the cross beam is provided with a second connecting beam extending towards the direction of the first connecting beams; one side of the protection plate is fixedly connected with the first connecting beams; the other side of the protection plate is fixedly connected with the second connecting beam; the bottom of each of the first connecting beams and the second connecting beam is provided with a first protrusion protruding towards the bottom guard plate; the first protrusion is in abutment with the bottom guard plate, so that cavities are formed between the bottom guard plate and the first connecting beams, the second connecting beam and the protection plate respectively. The cavities formed between the bottom guard plate and the first connecting beams, the second connecting beam and the protection plate can increase the distance between the outside and the battery cell module, so that the bearing capacity of the battery pack box body is increased.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a battery pack housing and a battery pack. Background Technology

[0002] With the rapid development of the new energy vehicle industry, new energy vehicles have gradually become integrated into people's daily lives. As the core component of new energy vehicles, the safety of power batteries is becoming increasingly prominent. In extreme collision conditions, the energy-absorbing structure design of existing power battery packs often fails to meet protection requirements, leading to damage to battery modules, exposure of battery cells, and potentially causing fires, resulting in injuries or fatalities and reducing vehicle driving safety. Summary of the Invention

[0003] In view of this, the present invention provides a battery pack housing and a battery pack to solve the technical problem of how to improve the load-bearing capacity of the battery pack housing.

[0004] In a first aspect, the present invention provides a battery pack housing, comprising:

[0005] Frame, bottom panel, at least one protective plate, and at least one crossbeam;

[0006] The bottom protective plate is disposed at the bottom of the frame and forms a receiving cavity with the frame;

[0007] The crossbeam is disposed within the frame and is used to divide the receiving cavity within the frame into multiple sub-receiving cavities, each of which is used to store a battery module.

[0008] The bottom of the frame is provided with first connecting beams extending toward each other on opposite sides, and the bottom of the crossbeam is provided with second connecting beams extending toward the first connecting beams. One side of the protective plate is fixedly connected to the first connecting beam, and the other side of the protective plate is fixedly connected to the second connecting beam.

[0009] The bottom of both the first connecting beam and the second connecting beam is provided with a first protrusion protruding towards the bottom protective plate. The first protrusion abuts against the bottom protective plate so that the bottom protective plate forms a cavity between itself and the first connecting beam, the second connecting beam and the protective plate respectively.

[0010] Beneficial effects: By placing the bottom protective plate at the bottom of the frame and enclosing it to form a receiving cavity, it facilitates the placement of battery modules within the cavity. Furthermore, the bottom protective plate effectively protects the bottom of the battery pack housing and ensures its airtightness. By incorporating crossbeams within the frame, the receiving cavity is divided into multiple sub-cavities, each capable of holding a battery module, resulting in more rational and orderly storage of the battery modules within the frame. On opposite sides of the bottom of the frame, first connecting beams extending towards each other are provided, and at the bottom of the crossbeams, second connecting beams extending towards the first connecting beams are provided. One side of the protective plate is fixedly connected to the first connecting beam, and the other side is fixedly connected to the second connecting beam, allowing the protective plate to be stably installed inside the battery pack housing and further protecting the bottom of the battery pack housing. The bottom of both the first connecting beam and the second connecting beam is provided with a first protrusion protruding towards the bottom guard plate. The first protrusion abuts against the bottom guard plate, so that the bottom guard plate forms a cavity with the first connecting beam, the second connecting beam and the guard plate respectively. This can increase the distance between the outside world and the battery cell module. When the bottom of the battery pack box is hit, the protective structure formed by the bottom guard plate and the guard plate can increase the load-bearing capacity of the battery pack box. The multiple cavities enhance the energy absorption effect, so as to better resist external damage and protect the battery pack safety to the greatest extent.

[0011] In an alternative embodiment, a third connecting beam is also included, and at least two protective plates are provided, with the third connecting beam disposed between two of the protective plates.

[0012] Beneficial effects: By setting at least two protective plates and a third connecting beam inside the frame, and placing the third connecting beam between two adjacent protective plates, the volume of the frame's internal cavity can be effectively increased, thereby increasing the number of battery modules that can be placed.

[0013] In one optional embodiment, both ends of the third connecting beam are provided with a second protrusion protruding towards the bottom protective plate, and the second protrusion abuts against the bottom protective plate, so that a cavity is formed between the bottom protective plate and the third connecting beam.

[0014] Beneficial effects: By setting second protrusions protruding towards the bottom guard plate at both ends of the third connecting beam and abutting the second protrusions against the bottom guard plate, a cavity can also be formed between the bottom guard plate and the third connecting beam, thereby increasing the distance between the third connecting beam and the bottom guard plate, which can further protect the bottom of the battery pack box.

[0015] In one optional embodiment, the end of the first connecting beam is further provided with a first step, the height of the end face of the first step gradually decreasing away from the first connecting beam; the two ends of the third connecting beam are respectively provided with second steps, the height of the end face of the second steps gradually decreasing away from the third connecting beam; the two sides of the protective plate are respectively fixedly connected to the first step and the second step.

[0016] Beneficial effects: By setting a first step at the end of the first connecting beam, and the height of the end face of the first step gradually decreases in the direction away from the first connecting beam; by setting a second step at both ends of the third connecting beam, and the height of the end face of the second step gradually decreases in the direction away from the third connecting beam; and by fixing both sides of the protective plate to the first step and the second step respectively, the distance between the protective plate and the battery pack housing cavity can be increased, which facilitates the formation of an exhaust channel.

[0017] In one optional embodiment, the bottom of the bottom guard plate is provided with at least one protruding rib extending along the end face of the bottom guard plate away from the end face of the bottom guard plate, the protruding rib is correspondingly disposed at the protective plate, and the orthographic projection of the protruding rib on the protective plate covers the protective plate.

[0018] Beneficial effects: Since the bottom guard plate is the first line of defense against hazardous conditions at the bottom of the battery pack housing, by setting at least one protruding rib extending from the end face of the bottom guard plate away from the end face, the distance between the outside and the battery module can be further increased. This provides a buffer distance when the bottom guard plate is subjected to hazardous conditions from the bottom, thereby offsetting the force applied by the hazardous conditions and protecting the battery module placed inside the battery pack housing. Furthermore, since the battery module is inverted in the receiving cavity, and the explosion-proof valve of the cell is correspondingly located at the guard plate, placing the protruding rib correspondingly at the guard plate, with the orthogonal projection of the protruding rib covering the guard plate, can effectively protect the cell explosion-proof valve, preventing it from being damaged from the bottom and avoiding dangers such as leakage and explosion, thus maximizing the protection of battery pack safety and passenger safety.

[0019] In one alternative embodiment, a plurality of elastic elements are further included, respectively disposed at the bottom of the first connecting beam and the second connecting beam.

[0020] Beneficial effects: Multiple elastic elements are installed at the bottom of the first and second connecting beams. When the bottom of the battery pack is impacted, the bottom guard plate moves towards the first and second connecting beams under force. The elastic elements can offset part of the force on the bottom guard plate, thereby preventing the battery module inside the battery pack from being damaged by external forces and protecting the battery module.

[0021] In an alternative embodiment, a sealed exhaust channel is further included, which is formed by the cooperation of the first connecting beam, the protective plate and the second connecting beam.

[0022] Beneficial effects: The first connecting beam, the protective plate and the second connecting beam work together to form a sealed exhaust channel. When the battery module generates heat during charging and discharging, the hot gas can be discharged from the battery pack box through the sealed exhaust channel, preventing the heat energy from entering the pack and avoiding damage to the battery module and other electrical components, thereby ensuring the stability and safety of the environment inside the battery pack box.

[0023] In one alternative embodiment, a mounting beam is also included, disposed on the outside of the frame and integrally formed with the frame.

[0024] Beneficial effects: By setting up a mounting beam on the outside of the frame and integrating the mounting beam with the frame, when the battery pack is squeezed, the compression energy of the battery pack can be consumed by the collapse of the mounting beam. Thus, when the battery pack box is subjected to large energy damage, the battery module can be better protected from damage, thereby improving the safety factor of the battery pack.

[0025] In one optional embodiment, both the frame and the third connecting beam are profile structures with multiple cavities; the protective plate is an aluminum plate.

[0026] Beneficial effects: By constructing the frame and third connecting beam using a profile structure, which has multiple cavities, the impact force on the battery pack housing can be offset by the profile structure itself. Designing the protective plate as an aluminum plate further reduces the danger of hazardous conditions at the bottom and increases the force the battery pack housing can withstand.

[0027] Secondly, the present invention also provides a battery pack, comprising:

[0028] The battery pack housing as described above;

[0029] A battery cover is provided on the battery pack housing, forming a sealed space with the battery pack housing;

[0030] A battery module, formed by combining multiple battery cells, is disposed in the sub-accommodating cavity within the battery pack housing. The explosion-proof valve of each battery cell is disposed above the protective plate and faces the protective plate.

[0031] Beneficial effects: By installing the battery cover on the battery pack housing, a sealed space is formed, which effectively protects the battery modules placed inside the housing, preventing external dust, moisture, and other impurities from entering and damaging the battery modules. Positioning the cell's explosion-proof valve above and facing the protective plate allows the plate to protect the valve to a certain extent; simultaneously, when the valve opens, the released substances can be discharged towards the protective plate, preventing direct damage to other important components within the battery pack. Because the battery pack, including the housing, also protects the battery modules inside, and has a high protection level, it can withstand significant forces, effectively improving the overall vehicle safety of vehicles using this battery pack and better protecting the personal safety of passengers. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a perspective view of a battery pack housing according to an embodiment of the present invention;

[0034] Figure 2 for Figure 1 The top view of the battery pack housing shown;

[0035] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0036] Figure 4 for Figure 3 A magnified view of part of C;

[0037] Figure 5 for Figure 3 A magnified view of part of D;

[0038] Figure 6 for Figure 2 A cross-sectional view along the BB direction;

[0039] Figure 7 for Figure 6 A magnified view of part of E in the diagram;

[0040] Figure 8 This is a schematic diagram of a battery pack compression test along the Y-axis according to an embodiment of the present invention;

[0041] Figure 9 This is a line graph showing the test results of a battery pack compression test along the Y-axis according to an embodiment of the present invention.

[0042] Figure 10 This is a schematic diagram of a ball impact test on the bottom of a battery pack according to an embodiment of the present invention;

[0043] Figure 11 This is a line graph showing the test results of a ball impact test on the bottom of a battery pack according to an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 100. Frame; 110. Longitudinal side beam; 111. First connecting beam; 1111. First protrusion; 1112. First step; 112. Reinforcing rib; 120. Transverse side beam; 130. Protective plate; 140. Third connecting beam; 141. Second protrusion; 142. Second step; 150. Horizontal beam; 151. Longitudinal horizontal beam; 1511. Second connecting beam; 152. Transverse horizontal beam; 160. Mounting beam; 170. Bottom protective plate; 171. Protruding rib; 180. Sealing element; 190. Sealed exhaust channel; 200. Cavity; 300. Elastic element. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] With continuous technological breakthroughs, resource investment, and product iteration, my country's new energy vehicle industry has maintained rapid growth. Coupled with government support, new energy vehicles will permeate all aspects of our lives, making their safety even more crucial. The power battery, as an energy storage and power output device, integrates the functions of a fuel tank and engine, and is a core component of electric vehicles. The safety of the power battery system directly determines the safety of the entire vehicle. Ensuring the safety of the battery pack under extreme conditions is a key direction for the sustainable development of automotive companies. For structural components, ensuring the safety of the battery pack under extreme collision conditions is even more stringent. Currently, the energy-absorbing structure design of the battery box in the power battery industry cannot meet the needs of extreme collision conditions. Therefore, a shock-absorbing structure around the power battery box is essential for vehicle safety design.

[0048] In current technologies, when a vehicle is involved in a side / frontal collision, the existing power battery will be impacted. Under extreme collision conditions, the battery box is at high risk of deformation. The side beams of the lower box can easily squeeze and intrude into the battery modules inside the power battery, causing damage to the battery modules. Exposed cells and wiring harnesses can easily cause vehicle fires, leading to personal injury or death, and thus reducing vehicle driving safety.

[0049] In view of this, the present invention provides a battery pack housing that can effectively improve the load-bearing capacity of the battery pack housing, thereby reducing the possibility of the battery module inside the power battery being squeezed by the side beam of the battery pack housing, thereby improving the safety of vehicle driving.

[0050] The following is combined Figures 1 to 11 The following describes embodiments of the present invention.

[0051] According to an embodiment of the present invention, in one aspect, in conjunction with [see also...] Figures 1 to 4 A battery pack housing is provided, including: a frame 100, a bottom protective plate 170, at least one protective plate 130, and at least one crossbeam 150; the bottom protective plate 170 is disposed at the bottom of the frame 100 and surrounds the frame 100 to form a receiving cavity; the crossbeam 150 is disposed within the frame 100 and is used to divide the receiving cavity within the frame 100 into multiple sub-receiving cavities, each sub-receiving cavity being used to store a battery module; the bottom of the frame 100 is provided with first connecting beams 111 extending toward each other on opposite sides, and the bottom of the crossbeam 150 is provided with a first connecting beam 111 extending toward each other. A second connecting beam 1511 extends from the direction of the first connecting beam 111. One side of the protective plate 130 is fixedly connected to the first connecting beam 111, and the other side of the protective plate 130 is fixedly connected to the second connecting beam 1511. The bottom of both the first connecting beam 111 and the second connecting beam 1511 is provided with a first protrusion 1111 protruding towards the bottom protective plate 170. The first protrusion 1111 abuts against the bottom protective plate 170 so that the bottom protective plate 170 forms a cavity 200 between itself and the first connecting beam 111, the second connecting beam 1511 and the protective plate 130 respectively.

[0052] In this embodiment, the bottom protective plate 170 is bolted to the bottom of the frame 100, forming a receiving cavity with the frame 100, which facilitates the placement of the battery module within the receiving cavity. Furthermore, the bottom protective plate 170 effectively protects the bottom of the battery pack housing and ensures its airtightness. A crossbeam 150 is provided within the frame 100 to divide the receiving cavity into multiple sub-receiving cavities, each of which can hold a battery module, making the storage of the battery module within the frame 100 more rational and orderly.

[0053] On opposite sides of the bottom of the frame 100, there are first connecting beams 111 extending toward each other. At the bottom of the crossbeam 150, there is a second connecting beam 1511 extending toward the first connecting beams 111. One side of the protective plate 130 is fixedly connected to the first connecting beam 111, and the other side of the protective plate 130 is fixedly connected to the second connecting beam 1511. This allows the protective plate 130 to be stably installed inside the battery pack housing and further protects the bottom of the battery pack housing. Specifically, the protective plate 130 can be fixedly connected to the first connecting beam 111 and the second connecting beam 1511 by welding, resulting in stronger connection stability between the protective plate 130 and the first and second connecting beams 111 and 1511.

[0054] Furthermore, the bottom of both the first connecting beam 111 and the second connecting beam 1511 is provided with a first protrusion 1111 protruding towards the bottom guard plate 170. The first protrusion 1111 abuts against the bottom guard plate 170, so that the bottom guard plate 170 forms a cavity 200 with the first connecting beam 111, the second connecting beam 1511 and the guard plate 130 respectively. This can increase the distance between the outside world and the battery cell module. When the bottom of the battery pack box is hit, the protective structure composed of the bottom guard plate 170 and the guard plate 130 can increase the load-bearing capacity of the battery pack box. The multiple cavities 200 enhance the energy absorption effect, so as to better resist external damage and protect the battery pack safety to the greatest extent.

[0055] In one embodiment, a third connecting beam 140 is also included, and at least two protective plates 130 are provided, with the third connecting beam 140 disposed between the two protective plates 130.

[0056] In this embodiment, the third connecting beam 140 is installed inside the frame 100 to support the battery module; one side of one protective plate 130 is fixedly connected to the first connecting beam 111, and the other side is fixedly connected to the third connecting beam 140; one side of another protective plate 130 is fixedly connected to the second connecting beam 1511, and the other side is fixedly connected to the third connecting beam 140. By setting multiple protective plates 130 and third connecting beams 140, the volume of the internal cavity of the frame 100 is effectively increased, thereby increasing the number of battery modules that can be placed inside the battery pack housing.

[0057] In one embodiment, both ends of the third connecting beam 140 are provided with second protrusions 141 protruding toward the bottom guard plate 170. The second protrusions 141 abut against the bottom guard plate 170, so that a cavity 200 is formed between the bottom guard plate 170 and the third connecting beam 140.

[0058] In this embodiment, a second protrusion 141 protruding towards the bottom protective plate 170 is provided at both ends of the third connecting beam 140, and the second protrusion 141 abuts against the bottom protective plate 170, so that a cavity 200 is also formed between the bottom protective plate 170 and the third connecting beam 140, thereby increasing the distance between the third connecting beam 140 and the bottom protective plate 170, which can further protect the bottom of the battery pack box.

[0059] In one feasible embodiment, the frame 100 includes two opposing longitudinal side beams 110 and two opposing transverse side beams 120, which are sequentially connected end-to-end to form the frame 100. The crossbeam 150 includes a longitudinal crossbeam 151 and multiple transverse crossbeams 152. The multiple transverse crossbeams 152 are respectively connected to the two opposing longitudinal side beams 110 and are parallel to the transverse side beams 120. The longitudinal crossbeams 151 are disposed on the two transverse crossbeams 152 near the transverse side beams 120 and are parallel to the longitudinal side beams 110. The bottom of the longitudinal side beams 110 has a first connecting beam 111 extending toward each other; the bottom of the longitudinal crossbeams 151 has a second connecting beam 1511 extending toward the two longitudinal side beams 110. Protective plates 130 are respectively connected to the second connecting beams 1511 and are sequentially fixedly connected to a third connecting beam 140, the protective plate 130, and the first connecting beam 111, thereby forming the battery pack housing. The bottom protective plate 170 is fixedly installed at the bottom of the frame 100. The bottoms of the first connecting beam 111 and the second connecting beam 1511 are each provided with a first protrusion 1111 protruding towards the bottom protective plate 170. Both ends of the third connecting beam 140 are provided with second protrusions 141 protruding towards the bottom protective plate 170. The first protrusions 1111 and the second protrusions 141 abut against the bottom protective plate 170, forming cavities 200 between the bottom protective plate 170 and the protective plate 130, the first connecting beam 111, the second connecting beam 1511, and the third connecting beam 140. This increases the distance between the outside environment and the battery module, thus better protecting the battery pack.

[0060] In one embodiment, the end of the first connecting beam 111 is provided with a first step 1112, and the height of the end face of the first step 1112 gradually decreases in the direction away from the first connecting beam 111; the two ends of the third connecting beam 140 are respectively provided with a second step 142, and the height of the end face of the second step 142 gradually decreases in the direction away from the third connecting beam 140; the two sides of the protective plate 130 are fixedly connected to the first step 1112 and the second step 142 respectively.

[0061] In this embodiment, a first step 1112 is provided at the end of the first connecting beam 111, and the height of the end face of the first step 1112 gradually decreases in the direction away from the first connecting beam 111. A first connecting surface facing the bottom guard plate 170 is also provided on the first step 1112, and one side of the guard plate 130 is fixedly connected to the first connecting surface. Second steps 142 are provided at both ends of the third connecting beam 140, and the height of the end face of the second step 142 gradually decreases in the direction away from the third connecting beam 140. A second connecting surface facing the bottom guard plate 170 is also provided on the second step 142, and the other side of the guard plate 130 is fixedly connected to the second connecting surface, thereby increasing the distance between the guard plate 130 and the battery pack housing cavity, which facilitates the subsequent formation of an exhaust channel.

[0062] In one embodiment, the bottom of the bottom guard plate 170 is provided with at least one protruding rib 171 extending along the end face of the bottom guard plate 170 away from the end face of the bottom guard plate 170. The protruding rib 171 is correspondingly provided at the protective plate 130, and the orthographic projection of the protruding rib 171 on the protective plate 130 covers the protective plate 130.

[0063] In this embodiment, since the bottom protective plate 170 is the first line of defense against hazardous conditions at the bottom of the battery pack housing, by providing at least one protruding rib 171 extending from the end face of the bottom protective plate 170 away from the end face of the bottom protective plate 170, the distance between the outside and the battery module can be further increased. This allows the bottom protective plate 170 to have a buffer distance when subjected to hazardous conditions at the bottom, thereby offsetting the force applied by the hazardous conditions at the bottom and protecting the battery module placed inside the battery pack housing. Furthermore, since the battery module is inverted in the receiving cavity, and the explosion-proof valve of the battery cell is correspondingly located at the protective plate 130, and the protruding rib 171 is correspondingly located at the protective plate 130, with the orthogonal projection of the protruding rib 171 covering the protective plate 130, the protective plate 130 and the explosion-proof valve of the battery cell can be effectively protected, preventing the explosion-proof valve of the battery cell from being damaged from the bottom and preventing dangers such as leakage and explosion, thus maximizing the protection of the battery pack safety and the personal safety of passengers.

[0064] In one embodiment, a plurality of elastic elements 300 are also included, respectively disposed at the bottom of the first connecting beam 111 and the second connecting beam 1511.

[0065] In this embodiment, the elastic element 300 can be disposed at the bottom of the first protrusion 1111, the second protrusion 141, and at the bottom of the first connecting beam 111 and the second connecting beam 1511 corresponding to the cavity 200. When the bottom of the battery pack is impacted, during the movement of the bottom guard plate 170 towards the first connecting beam 111 and the second connecting beam 1511, the elastic element 300 can offset part of the force on the bottom guard plate 170, thereby preventing the battery module inside the battery pack from being damaged by external forces and protecting the battery module. The elastic element 300 can be foam.

[0066] like Figure 6 and Figure 7 As shown, in one embodiment, a sealed exhaust channel 190 is also included, which is formed by the cooperation of a first connecting beam 111, a protective plate 130, and a second connecting beam 1511.

[0067] In this embodiment, since the end face height of the first step 1112 gradually decreases away from the first connecting beam 111, and the end face height of the second step 142 gradually decreases away from the third connecting beam 140, when the two sides of the protective plate 130 are fixedly connected to the first step 1112 and the second step 142 respectively, there is a certain distance between the protective plate 130 and the battery module, thus forming a sealed exhaust channel 190. One end of the sealed exhaust channel 190 is connected to the transverse beam 152 near one end of the transverse side beam 120 and is sealed by the sealant 180, so that gas cannot escape from here; the other end of the sealed exhaust channel 190 is connected to the transverse side beam 120 on the other side, and gas can enter the transverse side beam 120 through the sealed exhaust channel 190; when the gas pressure in the transverse side beam 120 reaches a preset value, the gas in the transverse side beam 120 can be discharged from the transverse side beam 120 to the outside. A sealing element 180 is also provided between the transverse side beam 120 and the transverse cross beam 152 to prevent gas from entering the battery pack housing; to avoid damage to the battery module and other electrical components, thereby ensuring the stability and safety of the environment inside the battery pack housing.

[0068] like Figure 5 As shown, in one embodiment, a mounting beam 160 is also included, which is disposed on the outside of the frame 100 and integrally formed with the frame 100.

[0069] In this embodiment, a mounting beam 160 is provided on the outer side of the frame 100 and is integrally formed with the frame 100. When the battery pack is subjected to Y-axis compression, the mounting beam 160 can immediately collapse and consume the compression energy of the battery pack, and then transfer the remaining energy inward. The area of ​​the frame 100 continues to collapse to consume the remaining energy, thereby protecting the battery module area from damage. When the battery pack casing is subjected to large energy damage, it can better protect the battery module from damage and improve the safety factor of the battery pack.

[0070] Furthermore, multiple reinforcing ribs 112 are provided within the frame 100. When the battery pack is subjected to Y-axis compression, the impact force is transmitted and gradually weakened through three paths: ①, ②, and ③. The impact force starts from one side, with the mounting beam 160 as the first contact point. The energy is weakened and transmitted at the mounting beam 160. In path ①, the reinforcing ribs 112 transmit the force to the crossbeam 150, allowing the crossbeam 150 to counteract the force. In paths ② and ③, the reinforcing ribs 112 transmit the force to the bottom of the battery pack housing, where the force is counteracted by the protective plate 130 and the third connecting beam 140. By weakening the force through these three paths, the battery pack can withstand greater side impact forces, better protect its internal safety, and improve its safety factor.

[0071] In one embodiment, the frame 100 and the third connecting beam 140 are both profile structures with multiple cavities; the protective plate 130 is an aluminum plate.

[0072] In this embodiment, by constructing the frame 100 and the third connecting beam 140 from a profile structure, the multiple cavities on the profile structure can offset the impact force on the battery pack housing when it is subjected to an impact. Designing the protective plate 130 as an aluminum plate further reduces the danger of hazardous conditions at the bottom and increases the force that the battery pack housing can withstand.

[0073] According to an embodiment of the present invention, in a second aspect, the present invention also provides a battery pack, comprising: a battery pack housing as described above; a battery cover plate disposed on the battery pack housing, forming a sealed space with the battery pack housing; a battery module formed by assembling multiple battery cells, disposed in a sub-accommodating cavity within the battery pack housing, wherein the explosion-proof valve of the battery cell is disposed above a protective plate 130 and faces the protective plate 130.

[0074] In this embodiment, by installing the battery cover on the battery pack housing, a sealed space is formed, which facilitates the protection of the battery modules placed in the housing cavity of the battery pack housing, preventing external dust, moisture, and other impurities from entering the battery pack housing and avoiding damage to the battery modules. The explosion-proof valve of the battery cell is positioned above and facing the protective plate 130, allowing the protective plate 130 to provide a certain degree of protection for the explosion-proof valve. Simultaneously, when the explosion-proof valve opens, the released substances can be discharged towards the protective plate 130, preventing direct damage to other important components within the battery pack. Because the battery pack includes the battery pack housing, it also protects the battery modules inside the housing. Furthermore, the battery pack has a high protection level and can withstand significant forces, effectively improving the overall vehicle safety of vehicles using this battery pack and better protecting the personal safety of passengers.

[0075] like Figures 8 to 11 As shown, the battery pack provided in the embodiment of the present invention is subjected to a compression collision test.

[0076] Figure 8 This is a schematic diagram of a Y-axis compression test performed on a battery pack provided in an embodiment of the present invention. Figure 9 This is a line graph of the test results.

[0077] pass Figure 9 It can be seen that when the battery pack provided by the present invention is subjected to Y-axis compression test, the battery pack housing can withstand a force of 200KN when the frame displacement is 94.5mm; while the general requirement for the battery pack housing is only 100KN-120KN. The force that the battery pack housing of the present invention can withstand is relatively high compared with the general requirement, thereby effectively improving the protection level of the battery pack side column collision condition.

[0078] Figure 10 This is a schematic diagram of a bottom ball impact test performed on a battery pack provided in an embodiment of the present invention. Figure 11 Line graph of test results.

[0079] pass Figure 11 It can be seen that when the battery pack provided by the present invention undergoes a bottom ball impact test, the bottom protective plate 170 can withstand a force of 38KN when the displacement is 22.12mm; while the bottom protective plate 170 of the battery pack housing is generally required to withstand 24KN. The bottom protective plate 170 of the battery pack housing of the present invention can withstand a relatively higher force than the general requirement, thereby effectively improving the protection level of the battery pack under the bottom ball impact condition.

[0080] In summary, the battery pack housing provided by this invention, under the same collision conditions, can more effectively protect the battery module from damage than existing technologies, reducing personal injury and property loss. By modifying the overall structure, the safety factor of the battery pack is improved, thereby enhancing the overall vehicle safety and better protecting the personal safety of passengers.

[0081] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack case characterized by, The battery pack box body comprises: a frame, a bottom guard plate, at least one protective plate and at least one cross beam; the bottom guard plate is arranged at the bottom of the frame and forms a containing cavity together with the frame; the cross beam is arranged in the frame and is used for dividing the containing cavity in the frame into a plurality of sub-containing cavities, each of which is used for storing a battery module; opposite sides of the bottom of the frame are respectively provided with first connecting beams extending towards each other, the bottom of the cross beam is provided with a second connecting beam extending towards the direction of the first connecting beam, one side of the protective plate is fixedly connected with the first connecting beam, and the other side of the protective plate is fixedly connected with the second connecting beam; the bottom of the first connecting beam and the second connecting beam is respectively provided with a first protrusion protruding towards the bottom guard plate, and the first protrusion abuts against the bottom guard plate to form a cavity between the bottom guard plate and the first connecting beam, the second connecting beam and the protective plate; a third connecting beam is further included, and the protective plate is provided with at least two, and the third connecting beam is arranged between the two protective plates; both ends of the third connecting beam are provided with second protrusions protruding towards the direction of the bottom guard plate, and the second protrusions abut against the bottom guard plate to form a cavity between the bottom guard plate and the third connecting beam; an end of the first connecting beam is further provided with a first step, an end face of the first step gradually decreases in a direction away from the first connecting beam, both ends of the third connecting beam are respectively provided with second steps, an end face of the second step gradually decreases in a direction away from the third connecting beam, and both sides of the protective plate are fixedly connected with the first step and the second step; the bottom of the bottom guard plate is provided with at least one protruding rib extending away from the end face of the bottom guard plate, the protruding rib is arranged at the protective plate, and a normal projection of the protruding rib on the protective plate covers the protective plate.

2. The battery pack enclosure of claim 1, wherein, a plurality of elastic members are further included and are arranged at the bottom of the first connecting beam and the second connecting beam.

3. The battery pack enclosure of claim 1, wherein, a closed exhaust passage is further included and is formed by cooperation of the first connecting beam, the protective plate and the second connecting beam.

4. The battery pack enclosure of claim 1, wherein, a mounting beam is further included and is arranged outside the frame and is integrally arranged with the frame.

5. The battery pack enclosure of claim 1, wherein, the frame and the third connecting beam are profile structures, a plurality of cavities are arranged on the profile structures, and the protective plate is an aluminum plate.

6. A battery pack, characterized by, The battery pack box body comprises: the battery pack box body according to any one of claims 1-5; a battery cover plate arranged on the battery pack box body and forming a sealed space with the battery pack box body; a battery module formed by a plurality of battery cells and arranged in the sub-containing cavity in the battery pack box body, an explosion-proof valve of the battery cell being arranged above the protective plate and facing the protective plate.

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