Battery pack and vehicle

Abstract

The application relates to the technical field of batteries, in particular to a battery pack and a vehicle, wherein the battery pack comprises a battery cell module, the battery cell module comprises battery cells, and one end of each battery cell is provided with a pole and the other end of each battery cell is provided with an explosion-proof valve, so that a pressure relief flow channel and a high-voltage electrical area are physically isolated in space, thereby eliminating the short circuit risk in the pressure relief process. In the battery pack provided by the application, the pole is arranged at the top of the battery cell, the explosion-proof valve is arranged at the bottom of the battery cell, the gas-electric separation structure physically isolates the pressure relief flow channel and the electrical area, which is beneficial to eliminating the short circuit risk and improving thermal safety, and in cooperation with the pressure relief hole at the bottom of the box body, the high-temperature jet is ensured to be guided out of the vehicle without obstruction, impact on the passenger compartment is avoided, and the short circuit risk in the pressure relief process is fundamentally eliminated.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and a vehicle. Background Technology

[0002] Power batteries are power supply devices that provide power for electric vehicles, electric trains, electric ships, etc., and are core components of new energy vehicles. A power battery pack is a complete functional unit that integrates multiple cells, modules, battery management system (BMS), thermal management system, and structural shell. It belongs to the engineered packaging form of power batteries. Currently, power battery packs have serious defects in thermal safety and space design: the cell explosion-proof valve and the terminal post are usually arranged on the same side (such as the top or side), which causes the high temperature and conductive jet to directly wash over the sampling harness, busbar and other electrical connectors when the pressure is released. This can easily cause short circuits between the positive and negative electrodes or high voltage arcing, which can then induce thermal runaway propagation of the entire pack, failing to meet the ultimate safety requirements of the whole vehicle. Summary of the Invention

[0003] The purpose of this application is to provide a battery pack and vehicle that, to a certain extent, solves the technical problem in the prior art where the cell explosion-proof valve and the terminal post are usually arranged on the same side, failing to achieve gas-electric separation, and thus posing a serious risk of short circuit and thermal runaway.

[0004] This application provides a battery pack including a cell module. The cell module includes a cell, and along a first preset direction, one end of the cell is provided with a terminal post, and the other end of the cell is provided with an explosion-proof valve, so that the pressure relief channel is physically isolated from the high-voltage electrical area in space, thereby eliminating the risk of short circuit during the pressure relief process.

[0005] In the above technical solution, the battery pack further includes a housing, the cell module includes a plurality of cells, and the plurality of cells are arranged in an array along a second preset direction and a third preset direction and installed in the housing, and the explosion-proof valve is provided at the bottom of the housing along the first preset direction.

[0006] In any of the above technical solutions, the housing further includes a support frame, a bottom plate, and a top cover; wherein the support frame is a hollow structure with openings at the top and bottom along the first preset direction, and along the first preset direction, the bottom plate is installed at the bottom of the support frame, the top cover is installed at the top of the support frame, and a plurality of the battery cells are installed in the space enclosed by the support frame, the bottom plate, and the top cover.

[0007] In any of the above technical solutions, the upper cover is further described as a double-layer structure, and the upper cover includes an upper plate and a lower plate connected to each other; wherein the upper plate is disposed away from the cell side relative to the lower plate, and the upper plate is provided with a plurality of reinforcing ribs protruding in a direction away from the lower plate.

[0008] In any of the above technical solutions, the reinforcing rib further includes a transverse reinforcing rib and a longitudinal reinforcing rib; wherein the transverse reinforcing rib extends along a second preset direction and the longitudinal reinforcing rib extends along a third preset direction.

[0009] In any of the above technical solutions, the two ends of the longitudinal reinforcing rib extend to the two side edges of the upper cover along the third preset direction.

[0010] In any of the above technical solutions, the lower plate is a parallel structure and is parallel to the upper surface of the battery cell module.

[0011] In any of the above technical solutions, the upper plate and the lower plate are further connected by welding.

[0012] In any of the above technical solutions, the reinforcing rib is further formed on the upper plate by stamping.

[0013] In any of the above technical solutions, the upper cover is further described as a double-layer composite steel plate structure.

[0014] In any of the above technical solutions, the battery pack further includes a sampling connection assembly, which is installed on top of all the cell modules and below the top cover along the first preset direction; the terminal post is disposed on top of the cell along the first preset direction, and the terminal post of the cell is connected to the busbar of the sampling connection assembly by welding; an adhesive layer is provided between the sampling connection assembly and the top cover to bond the sampling connection assembly to the top cover; a buffer gap is formed between the upper end face of the cell terminal post and the lower surface of the top cover along the first preset direction, and the sampling connection assembly and the adhesive layer fill the buffer gap.

[0015] In any of the above technical solutions, the upper cover and the support frame are further detachably connected by a first fastening member.

[0016] In any of the above technical solutions, the base plate and the support frame are further detachably connected by a second fastening member.

[0017] In any of the above technical solutions, the mating area between the base plate and the support frame is further sealed by sealant or sealing ring.

[0018] In any of the above technical solutions, further, along the first preset direction, the explosion-proof valve is disposed at the bottom of the battery cell, and the housing is provided with a pressure relief hole along the bottom of the first preset direction, and the pressure relief hole is provided in a one-to-one correspondence with the explosion-proof valve; The projection of the explosion-proof valve along the first preset direction falls completely into the projection of the pressure relief hole along the first preset direction, and a thermal expansion gap is formed at the edges of the two projections.

[0019] In any of the above technical solutions, further, the plurality of the battery cells are arranged in a square array along the second preset direction and the third preset direction.

[0020] In any of the above technical solutions, the battery cell is further described as a prismatic battery cell.

[0021] In any of the above technical solutions, the first preset direction is the same as the height direction of the housing and the height direction of the battery cell, the second preset direction is the same as the length direction of the housing and the thickness direction of the battery cell, and the third preset direction is the same as the width direction of the housing and the length direction of the battery cell.

[0022] In any of the above technical solutions, the battery pack further includes an elastic support member, which is fixed to the upper surface of the bottom of the housing along the first preset direction, and the cell module is located on the upper surface of the elastic support member.

[0023] In any of the above technical solutions, the number of elastic support members is multiple, and each of the elastic support members extends along a second preset direction, and the multiple elastic support members are spaced apart sequentially along a third preset direction.

[0024] In any of the above technical solutions, the projection of the elastic support member along the first preset direction is completely staggered with the projection of the explosion-proof valve along the first preset direction.

[0025] In any of the above technical solutions, an exhaust channel is further formed between any two adjacent elastic support members, and at least a portion of the exhaust channel is arranged along the first preset direction corresponding to the explosion-proof valve.

[0026] In any of the above technical solutions, the elastic support member is further described as pre-compressed silicone foam.

[0027] This application also provides a vehicle, including a body and a battery pack as described in any of the above technical solutions, wherein, along a second preset direction, a plurality of front connection points are formed in the area near the front end of the upper cover, and the plurality of front connection points are sequentially spaced along a third preset direction, and the front connection points are detachably connected to the front of the body by a first auxiliary fastener. The area near the rear end of the upper cover has a plurality of rear connection points, and the plurality of rear connection points are arranged sequentially at intervals along a third preset direction, and the rear connection points are detachably connected to the rear floor assembly of the vehicle body through a second auxiliary fastener. The central seat crossbeam of the vehicle body is connected to the upper cover, and the central seat crossbeam is also connected to the left and right door sills of the vehicle body; the pressure relief vent of the battery pack housing faces downwards from the vehicle body. Therefore, it possesses all the beneficial technical effects of this battery pack, which will not be elaborated further here.

[0028] Compared with the prior art, the beneficial effects of this application are as follows: In the battery pack provided in this application, the top of the battery cell is equipped with a terminal post, and the bottom of the battery cell is equipped with an explosion-proof valve. The gas-electric separation structure physically isolates the pressure relief channel from the electrical area, which helps to eliminate the risk of short circuit and improve thermal safety. In addition, in conjunction with the pressure relief hole at the bottom of the box, it ensures that the high-temperature jet is discharged outside the vehicle without obstruction, avoiding impact on the passenger compartment and fundamentally eliminating the short circuit hazard during the pressure relief process.

[0029] In addition, the double-layer steel plate cover adopts a welded structure of flat plate and reinforcing rib. The flat plate facilitates uniform bonding and reduces the amount of structural adhesive used, while the reinforcing rib improves modal stiffness and meets the mechanical protection requirements for occupant stepping and heavy object falling, taking into account both lightweight and safety.

[0030] In addition, the data acquisition and connection assembly, namely CCS, is located on the top of the battery cell. A buffer gap of 2-3mm is introduced between the battery cell and the top cover. When stepped on or dropped, this layer deforms first to absorb energy, which greatly reduces the impact on the battery cell body and avoids the breakage of the terminal post or the shell. A 60% pre-compressed silicone foam is set between the bottom of the battery cell and the bottom protection plate to provide normal support, absorb the height tolerance of the battery cell, buffer the deformation of the load in the middle of the vehicle, and effectively improve the modal frequency of the whole package, ensuring assembly feasibility and structural rigidity. Attached Figure Description To more clearly illustrate the technical solutions in the specific embodiments of this application or 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 this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 An exploded view of the battery pack provided in an embodiment of this application; Figure 2 This is a partial structural schematic diagram of the battery pack provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the top cover provided in an embodiment of this application.

[0032] Figure label: 1-Battery cell module; 11-Battery cell; 111-Terminal post; 112-Explosion-proof valve; 2-Box body; 21-Support frame; 22-Base plate; 23-Top cover; 231-Upper plate; 232-Lower plate; 233-Reinforcing rib; 2331-Transverse reinforcing rib; 2332-Longitudinal reinforcing rib; 234-Front connection point; 235-Rear connection point; 3-Sampling connection assembly; 4-Elastic support component; 5-Exhaust channel; 6-Adhesive layer; a-First preset direction; b-Second preset direction; c-Third preset direction. Detailed Implementation

[0033] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0034] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0035] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] The following reference Figures 1 to 3 This application describes a battery pack and vehicle according to some embodiments.

[0039] See Figure 1 and Figure 2 As shown, an embodiment of this application provides a battery pack including a cell module 1. The cell module 1 includes a cell 11, and along a first preset direction a, one end of the cell 11 is provided with a terminal post 111, and the other end of the cell 11 is provided with an explosion-proof valve 112, so that the pressure relief channel is physically isolated from the high-voltage electrical area in space, thereby eliminating the risk of short circuit during the pressure relief process.

[0040] As can be seen from the structure described above, in the battery pack provided by this application, the terminal post 111 and the explosion-proof valve 112 of the cell 11 are set at opposite ends. For example, the terminal post 111 is set at the top with the top facing upwards, and the explosion-proof valve 112 is set at the bottom with the bottom facing downwards, so that the pressure relief channel is physically isolated from the high-voltage electrical area in space, eliminating the risk of short circuit during the pressure relief process, making it safer and more reliable. Furthermore, preferably, the cell 11 is a prismatic cell 11. The prismatic cell 11 (square hard-shell lithium-ion cell 11) has a regular shape, which facilitates compact arrangement and can achieve a space utilization rate of over 80% in the battery pack, which is superior to the cylindrical cell 11. This helps to improve the overall energy density of the battery pack, and it also has good structural strength, safety and reliability, and is suitable for large-scale mass production, making it the mainstream choice for current new energy vehicles and energy storage systems. Of course, it is not limited to this; the type of cell 11 can be selected according to actual needs.

[0041] Furthermore, preferably, along the first preset direction a, the terminal post 111 is disposed on the top of the battery cell 11, and the explosion-proof valve 112 is disposed on the bottom of the battery cell 11. This way, when the battery cell 11 is used in the lower part of the vehicle body, the pressure relief direction is away from the passenger compartment, which is particularly suitable for the structure of the upper cover 23 in the CTB architecture, which is the floor of the vehicle body, preventing high-temperature shocks from being directly transmitted to the vehicle interior. Of course, this is not limited to this; the terminal post 111 can also be disposed on the bottom of the battery cell 11, and the explosion-proof valve 112 on the top of the battery cell 11, etc.

[0042] Furthermore, preferably, the first preset direction a is the same as the height direction of the housing 2 and the height direction of the battery cell 11, the second preset direction b is the same as the length direction of the housing 2 and the thickness direction of the battery cell 11, and the third preset direction c is the same as the width direction of the housing 2 and the length direction of the battery cell 11. Arranging the battery cell 11 and other structures according to this orientation helps to improve space utilization. Of course, it is not limited to the above. For example, the second preset direction b can also be the same as the width direction of the housing 2 and the thickness direction of the battery cell 11, and the third preset direction c can also be the same as the length direction of the housing 2 and the thickness direction of the battery cell 11, etc., depending on actual needs.

[0043] In one embodiment of this application, preferably, as shown below, Figure 1 As shown, the battery pack also includes a housing 2, the cell module 1 includes a plurality of cells 11, and the plurality of cells 11 are arranged in an array along the second preset direction b and the third preset direction c and installed inside the housing 2, and the explosion-proof valve 112 is provided at the bottom of the housing 2 along the first preset direction a. As can be seen from the structure described above, the battery cells 11 are directly arranged in groups within the battery pack frame. The sampling connection assembly 3 (CCS) mentioned below is arranged above the battery cells 11 and located between the battery cells 11 and the top cover 23. It can be seen that the battery cells 11 are directly inserted into the casing without an independent module structure, which saves assembly steps and parts. Furthermore, preferably, the multiple battery cells 11 are arranged in a square array along the second preset direction b and the third preset direction c, which helps to improve space utilization, but of course, it is not limited to this.

[0044] In one embodiment of this application, preferably, as Figure 1 and Figure 2 As shown, the housing 2 includes a support frame 21, a bottom plate 22, and a top cover 23; wherein, the support frame 21 is a hollow structure with openings at the top and bottom along a first preset direction a, and the bottom plate 22 is installed at the bottom of the support frame 21 along the first preset direction a, the top cover 23 is installed at the top of the support frame 21, and multiple battery cells 11 are installed in the space enclosed by the support frame 21, the bottom plate 22, and the top cover 23. As can be seen from the structure described above, the housing 2 in this application is designed as a split structure, that is, it consists of a support frame 21, a base plate 22 and a top cover 23, which facilitates the installation of structural components such as the battery cell 11 inside, and makes it easier to assemble and process and manufacture each component separately in the early stage. In one embodiment of this application, preferably, as shown below, Figures 1 to 3As shown, the upper cover 23 has a double-layer structure, and the upper cover 23 includes an upper plate 231 and a lower plate 232 connected to each other; wherein, the upper plate 231 is disposed on the side away from the battery cell 11 relative to the lower plate 232, and the upper plate 231 has a plurality of reinforcing ribs 233 protruding in the direction away from the lower plate 232. As can be seen from the structure described above, the cover is a double-layer structure and is equipped with reinforcing beams, which can improve the modal stiffness, resistance to trampling and drop impact of the upper cover 23. When the upper cover 23 is subjected to local concentrated load (such as being trampled by high heels), the load is first absorbed by the reinforcing ribs 233 and then transferred to the adhesive layer 6 through the flat plate buffer, further protecting the battery cell 11 below.

[0045] Furthermore, preferably, the upper plate 231 and the lower plate 232 are connected by welding, making the structure more robust and stable. Of course, this is not the only option.

[0046] Furthermore, preferably, the reinforcing rib 233 is formed on the upper plate 231 by stamping, forming an integral structure with higher strength and easier molding. Of course, it is not limited to this. For example, the reinforcing rib 233 can also be a structure independent of the upper plate 231, but is fixed to the upper plate 231 by welding or other processes. The specific choice depends on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 3 As shown, the reinforcing rib 233 includes a transverse reinforcing rib 2331 and a longitudinal reinforcing rib 2332; wherein, the transverse reinforcing rib 2331 extends along a second preset direction b, and the longitudinal reinforcing rib 2332 extends along a third preset direction c. As can be seen from the structure described above, setting transverse stiffeners 2331 and longitudinal stiffeners 2332 can significantly improve the local stiffness of the upper cover 23 and the torsional mode of the whole vehicle.

[0047] It should be noted that: only transverse reinforcing ribs 2331 or only longitudinal reinforcing ribs 2332 can be set, depending on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 3 As shown, the two ends of the longitudinal reinforcing rib 2332 extend to the two sides of the upper cover 23 along the third preset direction c, increasing the length of the reinforced area and improving the reinforcement effect. Of course, it is not limited to this. In one embodiment of this application, preferably, as shown below, Figure 3 As shown, the lower plate 232 has a parallel structure and is parallel to the upper surface of the cell module 1. As described above, the lower layer of the upper cover 23 is a flat plate structure, which facilitates large-area bonding with the battery cell module 1 and the data acquisition and connection assembly (CCS), reducing the amount of adhesive applied and lowering the weight. Of course, the lower layer of the upper cover 23 can also be a non-flat plate structure, depending on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 3 As shown, the upper cover 23 is a double-layer composite steel plate structure. The steel structure has high strength and good hardness, which can improve the modal stiffness, resistance to trampling, and resistance to drop impact of the upper cover 23. Of course, it is not limited to this. It should be noted that, preferably, the support frame 21 and the base plate 22 can also be made of steel, which is quite common and will not be described in detail here. In one embodiment of this application, preferably, as shown below, Figure 1 and Figure 2 As shown, the battery pack also includes a sampling connection assembly 3, which is installed on top of all the cell modules 1 and below the top cover 23 along the first preset direction a. A terminal post 111 is disposed on top of the cell 11 along the first preset direction a, and the terminal post 111 of the cell 11 is connected to the busbar of the sampling connection assembly 3 by welding. An adhesive layer 6 is provided between the sampling connection assembly 3 and the top cover 23 to bond the sampling connection assembly 3 to the top cover 23. As can be seen from the structure described above, by placing the sampling connection assembly 3 on top of the battery cell module 1, compared to the existing scheme where the battery cell 11 is inverted and the CCS is arranged at the bottom, a buffer safety gap is naturally added between the battery cell 11 and the top cover 23 (and this buffer safety gap is filled by the sampling connection assembly 3 and the adhesive layer 6). Under conditions such as occupant stepping, maintenance tools falling, or heavy object impact, this buffer layer will preferentially compress and deform to absorb energy, which will greatly reduce the impact force transmitted to the battery cell 11 body, effectively preventing the battery cell 11 pole post 111 from breaking, the shell from cracking, or the internal electrode plates from misaligning and short-circuiting, and significantly improving the mechanical reliability of the whole vehicle under the usage scenario. In one embodiment of this application, preferably, as shown below, Figure 2 As shown, a buffer gap is formed between the upper end face of the terminal post 111 of the battery cell 11 and the lower surface of the upper cover 23 along the first preset direction a. The sampling connection assembly 3 and the adhesive layer 6 fill the buffer gap, satisfying the installation space requirements of the sampling connection assembly 3 and the adhesive layer 6. At the same time, the force on the upper cover 23 passes through the adhesive layer 6 and the sampling connection assembly 3 in sequence, which plays a good buffering role for the battery cell module 1. Of course, it is not limited to this; a1 < 2 mm or a1 > 3 mm can also be made, depending on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 1 As shown, the top cover 23 and the support frame 21 are detachably connected by a first fastening member, such as a screw or bolt (the first fastening member is not shown in the figure). This is a detachable connection method, which is convenient for installation and disassembly, and especially convenient for later maintenance. In one embodiment of this application, preferably, as shown below, Figure 1As shown, the base plate 22 and the support frame 21 are detachably connected by a second fastening member, such as a screw or bolt (the first fastening member is not shown in the figure). This is a detachable connection method, which is convenient for installation and disassembly, and especially convenient for later maintenance. In one embodiment of this application, preferably, the mating area between the base plate 22 and the support frame 21 is sealed with sealant or a sealing ring (the sealant or sealing ring is not shown in the figure). As can be seen from the structure described above, when a certain cell 11 experiences thermal runaway, the high-temperature and high-pressure conductive jet is sprayed directly downwards. The base plate 22 and the support frame 21 are sealed, and the gas can only pass through the gap between the bottom of the cell 11 and the base plate 22 and finally be discharged from the explosion-proof valve 112. The pole post 111 and all electrical connectors are located above, and the jet path is completely separated from the electrical area, which fundamentally eliminates the risk of pressure relief smoke or molten material splashing onto the busbar and sampling harness in traditional solutions, causing short circuits or arcing of the positive and negative poles.

[0048] In one embodiment of this application, preferably, as shown below, Figure 2 As shown, along the first preset direction a, the explosion-proof valve 112 is located at the bottom of the battery cell 11, and the bottom of the housing 2 along the first preset direction a, i.e., the bottom plate 22, has a pressure relief hole (not shown in the figure). The pressure relief hole and the explosion-proof valve 112 are set one-to-one to ensure that the high-temperature jet is discharged outside the vehicle without obstruction. This is especially suitable for the structure of the upper cover 23 in the CTB architecture, which is the vehicle floor, to avoid impacting the passenger compartment above, but to face away from the passenger compartment, i.e., downward, thus fundamentally eliminating the short circuit hazard during the pressure relief process. Furthermore, preferably, the projection of the explosion-proof valve 112 along the first preset direction a completely falls into the projection of the pressure relief hole along the first preset direction a, and the edges of the two projections form a thermal expansion gap to ensure that the high-temperature jet is discharged without obstruction and to prevent blockage or throttling effect. In one embodiment of this application, preferably, as shown below, Figure 1 and Figure 2 As shown, the battery pack also includes an elastic support member 4, which is fixed to the upper surface of the bottom of the housing 2 along the first preset direction a, and the battery cell module 1 is located on the upper surface of the elastic support member 4. As described above, a normal gap, i.e., a gap along the first preset direction a, is reserved between the lower surface of the battery cell 11 and the base plate 22. An elastic support member 4 can be installed in this gap, assembled in a pre-compressed state between the lower surface of the battery cell 11 and the base plate 22, to provide normal support for the bottom of the battery cell 11, absorb assembly tolerances, buffer the deformation of the vehicle's central load, and improve the overall modal frequency. Of course, this elastic support member 4 can also be omitted, depending on actual needs. In one embodiment of this application, preferably, as shown below, Figure 1 As shown, there are multiple elastic support members 4, and each elastic support member 4 extends along the second preset direction b, and the multiple elastic support members 4 are spaced apart sequentially along the third preset direction c. As described above, the elastic support member 4 extends along the entire length of the housing 2, providing large-area support for the battery cell module 1 along the entire length of the housing 2. Furthermore, multiple elastic support members 4 arranged sequentially at intervals along the third preset direction c provide large-area and uniform support for the battery cell module 1 along the entire width of the housing 2, further enhancing the support effect and effectively absorbing assembly tolerances, buffering deformation under load in the middle of the vehicle, and improving the overall package modal frequency. Of course, the elastic support member 4 can also extend along other directions, such as the third preset direction c. In this case, multiple elastic support members 4 can be arranged sequentially at intervals along the second preset direction b, etc. In one embodiment of this application, preferably, as shown below, Figure 2 As shown, the projection of the elastic support member 4 along the first preset direction a is completely staggered with the projection of the explosion-proof valve 112 along the first preset direction a, preventing the elastic support member 4 from blocking the downwardly arranged exhaust channel 5, thereby ensuring normal exhaust in the event of thermal runaway. Of course, this is not the only possibility; the projection of the elastic support member 4 along the first preset direction a and the projection of the explosion-proof valve 112 along the first preset direction a may also be partially staggered, depending on the actual needs. In one embodiment of this application, preferably, as shown below, Figure 2 As shown, an exhaust channel 5 is formed between any two adjacent elastic support members 4, and at least a portion of the exhaust channel 5 is arranged in a first preset direction a corresponding to the explosion-proof valve 112. As can be seen from the structure described above, an exhaust channel 5 is formed between any two adjacent elastic support members 4, and this exhaust channel 5 can extend along the length of the entire box 2, increasing the space of the exhaust channel 5 and improving the exhaust effect during thermal runaway. Of course, it is not limited to this. In one embodiment of this application, preferably, as shown below, Figure 1 and Figure 2 As shown, the elastic support component 4 is a pre-compressed silicone foam, which has good elastic deformation performance. Preferably, this foam is pre-compressed to 60% of its original thickness and assembled between the lower surface of the battery cell 11 and the base plate 22 to provide normal support for the bottom of the battery cell 11, absorb assembly tolerances, buffer the deformation of the vehicle's middle load, and improve the modal frequency of the entire package. Of course, the material and pre-compression amount of the elastic support component 4 are not limited to the above and can be selected according to actual needs.

[0049] In summary, this battery pack has the following structure and advantages: This application proposes a gas-electric separation power battery assembly suitable for CTB / CTC architecture. The technical solution and its beneficial effects are described in detail below. First, this application has made an innovative design to the battery cell 11, with the explosion-proof valve 112 of the battery cell 11 facing downward (i.e. towards the bottom plate 22 of the battery pack), and the terminal post 111 of the battery cell 11 facing upward (i.e. towards the top cover 23 of the battery and the vehicle floor). This gas-electric separation topology structure enables the high-voltage electrical area (terminal post 111, sampling connection assembly 3, busbar, etc.) to be physically isolated from the pressure relief channel in space.

[0050] Meanwhile, an elastic buffer component, such as buffer foam, is added between the bottom of the battery cell 11 and the base plate 22. This buffer foam is strip-shaped and located on the shoulder of the battery cell 11, so it will not affect the pressure relief of the explosion-proof valve 112 at the bottom of the battery cell 11. When a battery cell 11 experiences thermal runaway, the high-temperature and high-pressure conductive jet is sprayed directly downwards. The bottom guard plate and the housing 2 are sealed. The gas passes through the gap between the bottom of the battery cell 11 and the base plate 22 and finally exits through the explosion-proof valve 112. The terminal post 111 and all electrical connections are located above, and the jet path is completely separated from the electrical area. This fundamentally eliminates the risk of pressure relief smoke or molten material splashing onto the busbar and sampling harness, causing short circuits or arcing between the positive and negative electrodes, as is common in traditional solutions. In addition, because the pressure relief direction is away from the passenger compartment, it is particularly suitable for the structure of the upper cover 23, which is the floor of the vehicle body, in the CTB architecture, avoiding the direct transmission of high-temperature impact to the vehicle interior.

[0051] Secondly, this invention eliminates the traditional module structure. The battery cells 11 are directly arranged in groups inside the housing 2, and the sampling connection assembly 3 (CCS) is arranged on top of the battery cells 11, between the battery cells 11 and the top cover 23. This module-free design not only improves the volume utilization rate, but more importantly, compared with the existing scheme where the battery cells 11 are inverted and the CCS is arranged at the bottom, a buffer gap of about 2 to 3 mm is naturally added between the battery cells 11 and the top cover 23. The sampling connection assembly 3 and the adhesive layer 6 are installed in this buffer gap. Under conditions such as occupant stepping, maintenance tools falling, or heavy object impact, this buffer layer will preferentially compress and deform to absorb energy, which greatly reduces the impact force transmitted to the battery cell 11 body, effectively preventing the battery cell 11 pole 111 from breaking, the shell from cracking, or the internal electrode misalignment and short circuit, significantly improving the mechanical reliability in the vehicle usage scenario.

[0052] To further improve the mechanical properties of the top cover 23 and reduce its weight, this application designs a double-layer steel plate structure for the top cover 23. The lower layer is a flat plate, and the upper layer is a stamped reinforcing rib 233 structure. The two layers are fixed by welding. The lower flat plate provides a flat and continuous bonding surface, which allows the CCS and the upper surface of the battery cell 11 to be evenly and firmly bonded by applying an appropriate amount of structural adhesive to the flat plate. This avoids the drawback of traditional single-layer ribbed top covers 23, which require a large amount of structural adhesive to adapt to irregular surfaces. This design also addresses the issue of reinforcing ribs on the vehicle floor. The thickness of the 233 layer is typically 7 to 8 mm. Based on this, the amount of structural adhesive used can be reduced by about 80%, thereby reducing the overall weight of the package. In addition, the upper reinforcing rib 233 independently undertakes the function of stiffness and strength enhancement, significantly improving the modal frequency and anti-stepping ability of the top cover 23. At the same time, the combination of the reinforcing rib 233 and the flat plate also allows the top cover 23 to be subjected to local concentrated loads (such as being stepped on by high heels). The load is first diffused and absorbed by the reinforcing rib 233, and then buffered and transferred to the adhesive layer 6 through the flat plate, further protecting the battery cell 11 below.

[0053] In terms of assembly process, this application adopts a "welding before bonding" method. Specifically, the sampling connection assembly 3 (CCS) and the terminal post 111 of the battery cell 11 are first laser-welded on an external dedicated fixture. After welding, the relative positions of the components remain unchanged. Then, the top cover 23, which is pre-coated with structural adhesive and has an adhesive layer 6, is assembled and bonded to the sampling connection assembly 3 (CCS) and the battery cell module 1 from top to bottom. This process ensures welding accuracy (because the welding reference is consistent with the fixture fixing reference) and avoids deviations or incomplete welds caused by secondary positioning in traditional step-by-step assembly. At the same time, since bonding is performed after welding, the high temperature of welding will not affect the performance of the structural adhesive, thereby ensuring the long-term reliability of the bonding, simplifying production line flow, and improving assembly consistency and production efficiency.

[0054] In addition, a normal gap is designed between the bottom of the battery cell 11 and the base plate 22, and a silicone foam is installed in the gap as an elastic support member 4. The foam is pre-compressed to 60% of its original thickness and is assembled between the lower surface of the battery cell 11 and the base plate. This design brings multiple benefits: First, the pre-compressed foam provides continuous normal elastic support, which can effectively absorb the height tolerance of the battery cell 11, ensuring that each battery cell 11 is subjected to uniform force during assembly, and avoiding loose or excessive tightness caused by the accumulation of tolerances; Second, during the vehicle's operation, the underbody protection plate will bend and deform due to road impact or load, and the cushioning effect of the foam can effectively absorb energy, improve the bottom impact resistance, avoid the battery cell 11 bearing excessive additional stress, and prevent the bottom of the battery cell 11 from deforming or cracking; Third, the 60% pre-compression design gives the foam sufficient initial stiffness, while still retaining 40% of the further compression stroke, which can increase the modal frequency of the entire package; Fourth, the elastic support at the bottom provides Z-down support for the battery cell 11, avoiding the battery cell 11 located in the middle of the package collapsing due to gravity due to gravity due to the use of structural adhesive, which would reduce the modal frequency and flatness of the entire package.

[0055] In addition, in summary, this application systematically solves the problems of short circuit risk, trampling impact damage, large amount of structural adhesive, difficulty in absorbing assembly tolerance, and low overall pack modality of traditional CTB battery packs through the synergistic effect of multiple technical features such as gas-electric separation topology, module-free integration, double-layer steel cover, welding-before-bonding process, bottom pre-compressed foam and upper CCS safety gap. It achieves comprehensive optimization of safety, lightweight, impact resistance, processability and structural stiffness. Embodiments of this application also provide a vehicle including the battery pack described in any of the above embodiments, thus possessing all the beneficial technical effects of the battery pack, which will not be repeated here.

[0056] In one embodiment of this application, preferably, as shown below, Figures 1 to 3 As shown, the vehicle also includes a body. Along the second preset direction b, a plurality of front connection points 234 are formed in the area near the front end of the cover 23. The plurality of front connection points 234 are arranged sequentially at intervals along the third preset direction c. The front connection points 234 are detachably connected to the front of the body by a first auxiliary fastener. The area near the rear end of the top cover 23 has a plurality of rear connection points 235, and the plurality of rear connection points 235 are arranged sequentially at intervals along a third preset direction c, and the rear connection points 235 are detachably connected to the rear floor assembly of the vehicle body through a second auxiliary fastener. The middle seat crossbeam of the vehicle body is connected to the upper cover 23, and the middle seat crossbeam is connected to the left and right door sills of the vehicle body; the pressure relief hole of the battery pack box 2 is set facing the lower part of the vehicle body. As can be seen from the structure described above, the upper plate 231 is integrally or separately provided with several transverse reinforcing ribs 2331. The transverse reinforcing ribs 2331 are provided with front connection points 234 and rear connection points 235, which are detachably or fixedly connected to the rear body structure and the front body structure, respectively, to improve the overall modal stiffness of the battery pack cover 23 and synergistically enhance the rigidity of the whole vehicle. At the same time, the middle seat beam of the vehicle body is fixed to the battery cover 23. Preferably, the middle seat beam is fixed to the cover 23 by spot welding, and the two ends of the middle seat beam are connected to the left door sill and the right door sill by bolts or welding, respectively. Thus, the front, middle and rear of the fixed-length cover 23 are connected to the vehicle body at multiple points to form an overall modal reinforcement frame, which effectively bears the load transmitted by the bonding area of ​​the battery cell 11. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, The device includes a battery cell module, which includes a battery cell. Along a first preset direction, one end of the battery cell is provided with an electrode post, and the other end of the battery cell is provided with an explosion-proof valve, so that the pressure relief channel is physically isolated from the high-voltage electrical area in space, thereby eliminating the risk of short circuit during the pressure relief process.

2. The battery pack according to claim 1, characterized in that, The battery pack also includes a housing, the cell module includes a plurality of cells, and the plurality of cells are arranged in an array along a second preset direction and a third preset direction and installed in the housing, and the explosion-proof valve is provided at the bottom of the housing along the first preset direction.

3. The battery pack according to claim 2, characterized in that, The housing includes a support frame, a bottom plate, and a top cover; wherein the support frame is hollow inside and has openings at the top and bottom along the first preset direction, and along the first preset direction, the bottom plate is installed at the bottom of the support frame, the top cover is installed at the top of the support frame, and a plurality of battery cells are installed in the space enclosed by the support frame, the bottom plate, and the top cover.

4. The battery pack according to claim 3, characterized in that, The top cover has a double-layer structure, and the top cover includes an upper plate and a lower plate connected to each other; wherein, the upper plate is disposed away from the cell side relative to the lower plate, and the upper plate has a plurality of reinforcing ribs protruding in a direction away from the lower plate.

5. The battery pack according to claim 4, characterized in that, The reinforcing ribs include transverse reinforcing ribs and longitudinal reinforcing ribs; wherein the transverse reinforcing ribs extend along a second preset direction, and the longitudinal reinforcing ribs extend along a third preset direction; and / or The two ends of the longitudinal reinforcing ribs extend to the two side edges of the upper cover along the third preset direction; and / or The lower plate has a parallel structure and is parallel to the upper surface of the battery cell module; and / or The upper plate and the lower plate are connected by welding; and / or The reinforcing ribs are formed on the upper plate by stamping; and / or The top cover is a double-layer composite steel plate structure.

6. The battery pack according to claim 3, characterized in that, The battery pack further includes a sampling connection assembly, which is mounted on top of all the cell modules and located below the top cover along the first preset direction. Along the first preset direction, the terminal post is disposed on top of the cell, and the cell's terminal post is connected to the busbar of the sampling connection assembly by welding. An adhesive layer is provided between the sampling connection assembly and the top cover to bond the sampling connection assembly to the top cover. A buffer gap is formed between the upper end face of the cell's terminal post and the lower surface of the top cover along the first preset direction, and the sampling connection assembly and the adhesive layer fill the buffer gap. and / or The upper cover is detachably connected to the support frame via a first fastening member; and / or The base plate and the support frame are detachably connected by a second fastening member; and / or The mating area between the base plate and the support frame is sealed with sealant or a sealing ring.

7. The battery pack according to claim 2, characterized in that, Along the first preset direction, the explosion-proof valve is disposed at the bottom of the battery cell, and the housing has a pressure relief hole formed at the bottom along the first preset direction, and the pressure relief hole is disposed in a one-to-one correspondence with the explosion-proof valve; The projection of the explosion-proof valve along the first preset direction falls completely within the projection of the pressure relief hole along the first preset direction, and a thermal expansion gap is formed at the edges of the two projections; and / or Multiple battery cells are arranged in a square array along the second preset direction and the third preset direction; and / or The battery cell is a prismatic battery cell; and / or The first preset direction is the same as the height direction of the housing and the height direction of the battery cell, the second preset direction is the same as the length direction of the housing and the thickness direction of the battery cell, and the third preset direction is the same as the width direction of the housing and the length direction of the battery cell.

8. The battery pack according to any one of claims 2 to 7, characterized in that, The battery pack also includes an elastic support member, which is fixed to the upper surface of the bottom of the housing along the first preset direction, and the battery cell module is located on the upper surface of the elastic support member.

9. The battery pack according to claim 8, characterized in that, The number of elastic support members is multiple, and each of the elastic support members extends along a second preset direction, and the multiple elastic support members are sequentially spaced along a third preset direction; and / or The projection of the elastic support member along the first preset direction is completely offset from the projection of the explosion-proof valve along the first preset direction. and / or An exhaust channel is formed between any two adjacent elastic support members, and at least a portion of the exhaust channels are arranged along the first preset direction corresponding to the explosion-proof valve; and / or The elastic support component is pre-compressed silicone foam.

10. A vehicle, characterized in that, The vehicle body includes a battery pack as described in claim 3; wherein, along a second preset direction, a plurality of front connection points are formed in the area near the front end of the upper cover, and the plurality of front connection points are sequentially spaced along a third preset direction, and the front connection points are detachably connected to the front of the vehicle body by a first auxiliary fastener. The area near the rear end of the upper cover has a plurality of rear connection points, and the plurality of rear connection points are arranged sequentially at intervals along a third preset direction, and the rear connection points are detachably connected to the rear floor assembly of the vehicle body through a second auxiliary fastener. The middle seat crossbeam of the vehicle body is connected to the upper cover, and the middle seat crossbeam is connected to the left and right door sills of the vehicle body; the pressure relief hole of the battery pack housing is located facing downwards of the vehicle body.

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