Battery box body and power battery

Abstract

The utility model relates to the technical field of power batteries, and provides a battery box body and a power battery, the battery box body comprises a shell and a runner plate, the shell is used for installing a battery cell module, the side wall of the shell is provided with an anti-explosion valve, the runner plate is connected to the bottom in the shell, and the runner plate is connected to the bottom in the shell. The runner plate is provided with an air exhaust groove, an air inlet and an air outlet, the air inlet and the air outlet are respectively communicated with the air exhaust groove, an air exhaust valve of a battery cell in the battery cell module faces the runner plate, the position of the air exhaust valve corresponds to the position of the air inlet, and the air outlet is communicated with the anti-explosion valve. High-temperature and high-pressure gas generated during thermal runaway of the battery cell can be quickly exhausted to the explosion-proof valve from the exhaust flow channel at the bottom of the shell in time, so that the high-temperature and high-pressure gas is prevented from being diffused into the whole shell and is exhausted only from the flow channel at the bottom of the shell; therefore, the influence on other battery cells or other battery cell modules when a single battery cell is subjected to thermal runaway is effectively prevented, and the use safety of the power battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, specifically, relate to a battery box body and power battery. BACKGROUND

[0002] With the development of new energy automobile industry, especially in electric vehicles, power battery as the power source of electric vehicles, is more and more widely used, at the same time, the use safety of power battery is more and more concerned. Power battery in the case of instability or insecurity is generally called thermal runaway, power battery thermal runaway refers to that, due to temperature, collision and other reasons, excessive heat is generated in the power battery or the internal battery module, and the battery temperature rises rapidly, exceeds the range that can be safely borne, thereby causing fire, explosion and other accidents.

[0003] In order to prevent the occurrence of thermal runaway accident, avoid the imbalance of internal and external pressure of power battery, and considering that a large amount of toxic gas will be generated instantaneously when fire occurs, it is necessary to discharge gas regularly and directionally, and explosion-proof valve emerges as the times require. The explosion-proof valve is generally installed in the shell of the battery, and is used to communicate with the external environment for exhaust and pressure relief when thermal runaway occurs in a certain battery or battery module in the power battery. At the same time, a single battery is generally provided with an exhaust valve, in order to exhaust and pressure relief for the battery when thermal runaway occurs in the single battery.

[0004] However, in the current power battery thermal runaway prevention process, when the battery occurs thermal runaway, high temperature and high pressure gas will diffuse in the whole power battery, and when the pressure reaches a certain value, the explosion-proof valve will open and release pressure. This is to make these high temperature and high pressure gases diffuse in the power battery, which has a great possibility of causing spontaneous combustion of other batteries without thermal runaway, thereby possibly accelerating the burning and explosion speed of the whole power battery. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is how to improve the use safety of power battery.

[0006] The utility model provides a battery box body, including shell and runner plate, the shell is used for installing battery module in, the lateral wall of shell is provided with explosion-proof valve, the runner plate is connected to the bottom in the shell, the runner plate is provided with exhaust groove and the air inlet and air outlet that communicate with exhaust groove respectively, the exhaust valve of battery in battery module is towards the runner plate, and the position of exhaust valve (02) corresponds with the position of air inlet, the air outlet communicates with explosion-proof valve.

[0007] Optionally, the exhaust groove comprises straight-line exhaust grooves and non-straight-line exhaust grooves, and the straight-line exhaust grooves and the non-straight-line exhaust grooves are staggered and communicated to form the exhaust groove.

[0008] Optionally, the straight-line exhaust grooves and the non-straight-line exhaust grooves are staggered and communicated to form the exhaust groove, which means that one straight-line exhaust groove is communicated with one non-straight-line exhaust groove, and then communicated with another straight-line exhaust groove, and the communication is sequentially extended to form an exhaust passage, and a plurality of exhaust passages are cross communicated to form the exhaust groove, and the non-straight-line exhaust groove is a circular groove.

[0009] Optionally, the shell comprises a frame and a bottom plate, the bottom plate is connected to the lower end of the frame, and the flow channel plate is connected to the frame and arranged above the bottom plate.

[0010] Optionally, the exhaust groove is arranged on the end surface of the flow channel plate away from the battery cell module.

[0011] Optionally, the side beam of the frame is provided with an exhaust cavity and a first air inlet hole and an air outlet hole communicated with the exhaust cavity, respectively, the first air inlet hole is connected with the exhaust port, and the explosion-proof valve is arranged in the air outlet hole.

[0012] Optionally, the flow channel plate comprises two plate bodies with a gap arranged therebetween, the gap is configured as the air inlet, and the position of the gap corresponds to the position of one row of exhaust valves of the battery cell module.

[0013] Optionally, the side beam of the frame is provided with a second air inlet hole corresponding to the position of the gap, and the second air inlet hole is communicated with the explosion-proof valve.

[0014] Optionally, the battery box body further comprises a heat insulation sheet arranged at a position corresponding to the gap on the upper end surface of the bottom plate.

[0015] Compared with the prior art, the battery box body has the following technical effects:

[0016] The battery box body provided by the utility model can be used as the box body of the power battery, the cell module formed by multiple cells arranged side by side or in an array can be installed in the shell through the shell, meanwhile, the flow channel plate is connected to the bottom of the shell, the exhaust groove, the air inlet and the air outlet which are communicated with the exhaust groove are arranged on the flow channel plate, so that the flow channel for exhausting is formed after the exhaust groove is buckled with the bottom of the shell, the air inlet and the exhaust valve of the cell are arranged in a position corresponding to each other, the air outlet is communicated with the explosion-proof valve arranged on the side wall of the shell, and then when the cell of the power battery is out of control, the high-temperature and high-pressure gas sprayed by the cell exhaust valve can enter the exhaust groove from the air inlet quickly, is discharged to the explosion-proof valve through the air outlet and is discharged to the outside of the shell through the explosion-proof valve, that is, the high-temperature and high-pressure gas when the cell is out of control can be discharged to the explosion-proof valve from the exhaust flow channel of the bottom of the shell quickly, the high-temperature and high-pressure gas is prevented from diffusing to the whole shell, the exhaust is only conducted from the flow channel of the bottom of the shell, and then the influence of the single cell out of control on other cells or other cell modules is effectively prevented, and the use safety of the power battery is improved.

[0017] In addition, the utility model discloses a kind of power batteries, including cell module and the battery box body as described above, the cell module is arranged in the battery box body, and the exhaust valve of one row of the cell module is attached with heat insulation band.

[0018] Compared with prior art, the power battery provided by the utility model by setting cell module and the battery box body as described above, its technical effects are substantially the same as the technical effects of the battery box body, which will not be repeated here, and by attaching heat insulation band on the exhaust valve of one row of the cell module, when the exhaust valve of single cell discharges high-temperature and high-pressure gas, heat insulation band can further prevent high-temperature and high-pressure gas from affecting surrounding cells, and can further prevent high-temperature and high-pressure gas from diffusing upwards, so that it enters the air inlet of flow channel plate quickly, and then the use safety of the power battery is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the explosion structure schematic view of the battery box body of the utility model embodiment;

[0020] Figure 2 It is the bottom structure schematic view of the frame and flow channel plate of the utility model embodiment;

[0021] Figure 3 It is Figure 2 It is the section structure schematic view of middle A-A;

[0022] Figure 4 It is the top structure schematic view of the battery box body of the utility model;

[0023] Figure 5 is a bottom view structural schematic diagram of the battery box body of the utility model;

[0024] Figure 6 is Figure 5 is a middle B-B section structure schematic diagram;

[0025] Figure 7 is another structural schematic diagram of the battery box body of the utility model;

[0026] Figure 8 is a three-dimensional structural schematic diagram of the battery cell module of the utility model;

[0027] Figure 9 is an explosion structural schematic diagram of the battery cell module of the utility model;

[0028] Figure 10 is another angle structural schematic diagram of the battery cell module of the utility model;

[0029] Figure 11 is a partial structural schematic diagram of the battery cell module of the utility model.

[0030] Explanation of reference signs:

[0031] 10 - flow channel plate, 11 - notch, 12 - exhaust port, 13 - linear exhaust groove, 14 - non-linear exhaust groove, 15 - air inlet, 20 - explosion-proof valve, 30 - frame, 31 - exhaust cavity, 32 - first air inlet hole, 33 - intermediate beam, 34 - side beam, 35 - end beam, 36 - second air inlet hole, 40 - bottom plate, 50 - connecting piece, 60 - heat insulation sheet, 70 - fastener, 80 - liquid cooling plate, 01 - battery cell module, 02 - exhaust valve, 03 - heat insulation belt, 04 - steel belt, 05 - end plate. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0033] It should be noted that the terms "first", "second" and the like in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0034] In the description of the present invention, the directions or positional relationships indicated by the terms "upper," "lower," "left," "right," "top," "bottom," "front," "back," "inside," and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention. They are not intended to indicate or imply that the device referred to must have a specific direction, be constructed, or be operated in a specific direction. Therefore, they should not be construed as limiting the scope of protection of the present invention. Furthermore, a coordinate system XYZ is provided herein, wherein the positive direction of the X-axis represents the right direction, the negative direction of the X-axis represents the left direction, the positive direction of the Y-axis represents the front direction, the negative direction of the Y-axis represents the back direction, the positive direction of the Z-axis represents the top direction, and the negative direction of the Z-axis represents the bottom direction.

[0035] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0036] Throughout this specification, references to the terms "embodiment," "one embodiment," and "one implementation" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or implementation are included in at least one embodiment or implementation of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

[0037] In order to solve the above technical problems, Figures 1 to 6 As shown, an embodiment of the present invention provides a battery box body, including a shell and a flow channel plate 10, the shell is used to install a battery module 01, the side wall of the shell is provided with an explosion-proof valve 20, the flow channel plate 10 is connected to the bottom of the shell, the flow channel plate 10 is provided with an exhaust groove and an air inlet 15 and an exhaust port 12 respectively connected to the exhaust groove, the exhaust valve 02 of the battery cell in the battery cell module 01 faces the flow channel plate 10, and the position of the exhaust valve 02 corresponds to the position of the air inlet 15, and the exhaust port 12 is connected to the explosion-proof valve 20.

[0038] It should be noted that the shell can be a frame structure opening upward, for example, a structure formed by connecting the frame 30 and the bottom plate 40, the bottom plate 40 is connected to the lower end of the frame 30 to form the shell, the bottom plate 40 as the bottom structure of the shell, the flow channel plate 10 is buckled on the bottom plate 40, and the lower end surface of the flow channel plate 10 is provided with a groove structure to form an exhaust groove, so that the exhaust groove is buckled on the bottom plate 40 to form a flow channel that can exhaust. It can be understood that the exhaust groove can be a plurality of mutually connected ones, and at the same time, the air inlet 15 and the air outlet 12 can also be provided as a plurality of ones, and the number and size of the flow channel plate 10 can be designed according to actual needs, as long as the lower end of the battery cell module 01 is sealed, and the exhaust valve 02 of the battery cell is aligned with the air inlet 15, that is, the positions correspond, for example Figure 1 and Figure 2 The flow channel plate 10 is provided as two plate structures, and the gap between the two plate bodies can be used to align the air inlet 15 with the exhaust valve 02 of the battery cell, and at the same time, the gap can be communicated with the notch 11 on the side wall of the plate body. In this way, when thermal runaway occurs, the high-temperature and high-pressure gas discharged from the exhaust valve 02 can only enter the exhaust groove from the air inlet 15, and then flow to the explosion-proof valve 20 to be discharged to the outside environment or a specified device. At the same time, it can be understood that the exhaust valve 02 and the explosion-proof valve 20 are valve structures that can be opened and pressure relieved under a certain internal pressure, and the number of explosion-proof valves 20 can be set according to actual needs, and as shown in Figures 8 to 11 The battery cell module 01 is generally formed by arranging a plurality of battery cells side by side or in an array, and the battery cells can be connected as a whole by heat insulation glue, etc. In this embodiment, the battery cell module 01 is connected by a row of battery cells, and the exhaust valve 02 of the battery cell is arranged at the lower end of the battery cell, that is, the end surface pointed by the negative direction of the Z axis. When the battery cell module 01 is installed in the shell, the exhaust valve 02 of the battery cell is also arranged downward, which is convenient for aligning with the air inlet 15 of the flow channel plate 10, and also facilitates the high-temperature and high-pressure gas generated after thermal runaway to enter the exhaust groove at the bottom of the whole body in time and quickly, thereby preventing the high-temperature and high-pressure gas from diffusing to the entire shell, and further improving the safety of the power battery.

[0039] As shown in Figure 7 The battery shell can also include a cover plate structure arranged on the upper end of the shell, that is, the upper end of the frame 30, to form a relatively sealed overall structure. At the same time, the cover plate can also be provided as a liquid cooling plate 80 to cool and dissipate heat for the battery cell module 01 in the shell, and the structure is more reasonable and makes full use of the installation space. As shown in Figures 8 to 11As shown, one battery cell module 01 can be bundled by four steel belts 04 to form a plurality of battery cells, and the front and rear ends, that is, the two ends in the direction indicated by the Y axis are reinforced by two end plates 05, which is more stable and reliable. In addition, it should be understood that the battery box provided in the embodiment can install a plurality of battery cell modules 01, such as two, four, etc., which are not limited here.

[0040] In the embodiment, the battery box provided in the embodiment can be used as the box body of the power battery. By providing the shell, the battery cell module 01 formed by a plurality of battery cells arranged side by side or in an array can be installed inside the shell. At the same time, the flow channel plate 10 is connected to the bottom of the shell, and the exhaust groove, the air inlet 15 and the exhaust port 12 respectively communicating with the exhaust groove are arranged on the flow channel plate 10. In this way, the exhaust groove and the bottom of the shell are buckled to form a flow channel for exhaust. The air inlet 15 is arranged in position with the exhaust valve 02 of the battery cell, that is, the positions of the two correspond to each other. The exhaust port 12 is in communication with the explosion-proof valve 20 arranged on the side wall of the shell. If the battery cell of the power battery is in thermal runaway, the high-temperature and high-pressure gas sprayed by the battery cell exhaust valve 02 can enter the exhaust groove through the air inlet 15 quickly and rapidly, and be discharged to the explosion-proof valve 20 through the exhaust port 12, and then be discharged to the outside of the shell through the explosion-proof valve 20. That is, the high-temperature and high-pressure gas when the battery cell is in thermal runaway can be quickly discharged to the explosion-proof valve 20 through the exhaust flow channel at the bottom of the shell, preventing the high-temperature and high-pressure gas from diffusing into the entire shell. Only the flow channel at the bottom of the shell is used for exhaust, thereby effectively preventing the influence of thermal runaway of a single battery cell on other battery cells or other battery cell modules 01, and improving the use safety of the power battery.

[0041] Optionally, as shown in the Figures 1 to 3 exhaust groove includes a straight-line exhaust groove 13 and a non-straight-line exhaust groove 14. The plurality of straight-line exhaust grooves 13 and the plurality of non-straight-line exhaust grooves 14 are in staggered communication to form the exhaust groove.

[0042] Specifically, the straight-line exhaust groove 13 is a rectangular groove structure, and the non-straight-line exhaust groove 14 can be a groove structure with a whole curve, a polygon, etc. For example, the non-straight-line exhaust groove 14 in the embodiment is a circular groove structure. At the same time, the straight-line exhaust groove 13 and the non-straight-line exhaust groove 14 are in staggered communication and can be distributed in an array, that is, they can be regularly distributed, which is convenient for production and manufacturing and improves the controllability of gas flow. At the same time, the exhaust port 12 is a gap formed by opening the groove wall of the exhaust groove. The specific opening position can be set according to actual needs. For example, the exhaust port 12 needs to be opened close to the explosion-proof valve 20.

[0043] Preferably, the flow channel plate 10 is made of expanded polypropylene (EPP for short), which has both solid and gaseous properties, is light in weight and has a certain hardness, is easy to install, can absorb noise generated during vehicle driving, has heat insulation effect, and when thermal runaway occurs, the flow channel plate 10 made of EPP material can take away part of the heat by melting, delaying the speed of thermal runaway. At the same time, the exhaust groove of the flow channel plate 10 can be integrally molded, which is easy to produce and has low cost.

[0044] In the embodiment, by setting the exhaust groove as a structure in which a plurality of linear exhaust grooves 13 and a plurality of non-linear exhaust grooves 14 are staggered and communicated with each other, on the one hand, the linear exhaust grooves 13 can guide the high-temperature and high-pressure gas to flow quickly, and on the other hand, the non-linear exhaust grooves 14 have a longer exhaust path and can buffer the high-temperature and high-pressure gas to achieve the effect of pressure and temperature reduction. The combination of the two staggered and communicated settings and the plurality of settings can realize the step-by-step pressure reduction of the high-temperature and high-pressure gas generated by thermal runaway, thereby further improving the safety in use.

[0045] Optionally, as shown in Figure 2 The plurality of linear exhaust grooves 13 and the plurality of non-linear exhaust grooves 14 staggered and communicated with each other to form the exhaust groove means that one linear exhaust groove 13 is communicated with one non-linear exhaust groove 14, and then communicated with another linear exhaust groove 13, and sequentially extended to form an exhaust passage. A plurality of exhaust passages are cross-connected to form the exhaust groove, and the non-linear exhaust groove 14 is a circular groove.

[0046] It should be noted that the circular groove means that the groove opening and the groove bottom are circular, that is, the internal space of the groove is cylindrical, and the groove wall forms a structure equivalent to the cylinder wall, which can effectively buffer the high-temperature and high-pressure gas.

[0047] In the embodiment, by setting one linear exhaust groove 13 to be communicated with one non-linear exhaust groove 14, and then communicated with another linear exhaust groove 13, and sequentially extended to form an exhaust passage, and then cross-connecting a plurality of exhaust passages to form the exhaust groove, it is convenient to form the exhaust groove staggered and communicated with each other. By setting the non-linear exhaust groove 14 as a circular groove, when thermal runaway occurs, the high-temperature and high-pressure gas enters the exhaust groove and is introduced into the circular groove. The cylindrical wall of the circular groove can effectively buffer the gas flow, and the cylindrical exhaust space can effectively reduce the gas flow interruption phenomenon, so that the high-temperature and high-pressure gas is discharged more quickly and smoothly, thereby improving the exhaust effect and efficiency.

[0048] Optionally, as shown in Figure 1 , Figure 4 , Figure 5 and Figure 7 , the shell comprises a frame 30 and a bottom plate 40, the bottom plate 40 is connected to the lower end of the frame 30, the flow channel plate 10 is connected to the frame 30, and is arranged above the bottom plate 40.

[0049] Specifically, the bottom 40 is connected to the lower end of the frame 30 by fasteners 70, and covers the lower end of the frame 30, the fasteners 70 can be bolts, screws or rivets, etc., which are not limited here, at the same time, the frame 30 is a whole rectangular frame structure, and correspondingly, the bottom plate 40 is a rectangular plate structure matched therewith, for example Figure 1 , the frame 30 comprises two side beams 34 as long sides respectively located at the front end and the rear end, i.e. the two ends in the Y-axis direction in Figure 1 , and two end beams 35 as short sides respectively located at the left end and the right end, i.e. the two ends in the X-axis direction in Figure 1 , the bottom plate 40 is connected to the two side beams 34 and the two end beams 35 respectively through the fasteners 70, and at the same time, an intermediate beam 33 can also be arranged between the two end beams 35, the two ends of the intermediate beam 33 are connected to the inner walls of the two side beams 34 respectively, and can be connected to the bottom plate 40 and the vehicle body by bolts, the overall structure is more stable and reliable.

[0050] In the embodiment, by arranging the shell in the form of the frame 30 and the bottom plate 40 connected, on the one hand, it is convenient for processing and assembling, and on the other hand, it is convenient for the connection and fixation of the flow channel plate 10, that is, it is convenient for forming the overall bottom exhaust structure, and at the same time, the structure is stable and reliable.

[0051] Optionally, as shown in Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 10 , the exhaust groove is arranged at the end face of the flow channel plate 10 away from the battery cell module 01.

[0052] Specifically, the lower end face of the flow channel plate 10 is closely attached to the upper end face of the bottom plate 40, that is, the opening of the entire exhaust groove is covered by the upper end face of the bottom plate 40, so that the exhaust groove forms a relatively closed exhaust passage, and the reliability and controllability of the overall exhaust are ensured.

[0053] In the embodiment, by arranging the exhaust groove on the end surface of the flow channel plate 10 away from the battery cell module 01, that is, arranging the battery cell module 01 above the flow channel plate 10, the exhaust groove is arranged on the lower end surface of the flow channel plate 10. On the one hand, it is convenient to form an overall bottom exhaust passage structure to prevent high-temperature and high-pressure gas from diffusing to the inside of the whole body, and the gas can be smoothly and reliably discharged only from the bottom exhaust passage. On the other hand, the battery cell module 01 is isolated from the exhaust passage, which further prevents the influence of high-temperature and high-pressure gas on the battery cell module 01, ensures the safe and reliable operation of the battery cell module 01, and further improves the safety of the whole body in use.

[0054] Optionally, as shown in Figures 1 to 7 , the side beams 34 of the frame 30 are provided with exhaust cavities 31 and first air inlet holes 32 and air outlet holes respectively communicating with the exhaust cavities 31, the first air inlet holes 32 are connected with the exhaust port 12, and the explosion-proof valve 20 is arranged in the air outlet hole.

[0055] Specifically, the two oppositely arranged side beams 34 of the frame 30 are each provided with an exhaust cavity 31, the exhaust cavity 31 can be formed by profile combination, and is consistent with the length of the side beam 34, that is, the X-axis direction as Figure 1 shown, and the connection of the first air inlet hole 32 and the exhaust port 12 can be achieved by abutting or by profile edge lap joint, that is, to achieve alignment and sealing connection to guide the gas to flow smoothly into the exhaust cavity 31.

[0056] In the embodiment, by arranging the exhaust cavities 31 on the side beams 34 of the frame 30, and arranging the first air inlet holes 32 and the air outlet holes respectively communicating with the exhaust cavities 31, and by connecting the first air inlet holes 32 with the exhaust port 12 of the flow channel plate 10, and arranging the explosion-proof valve 20 in the air outlet hole, when thermal runaway occurs, as shown by the arrow, Figure 3 , the path of gas discharge, the gas can flow through the exhaust groove of the flow channel plate 10 to the exhaust port 12, and enter the exhaust cavity 31 through the first air inlet hole 32, and then be discharged from the explosion-proof valve 20, and the exhaust cavity 31 can be more conducive to the gathering of the gas, that is, more convenient for the discharge of the gas.

[0057] Optionally, as shown in Figures 1 to 7 , the exhaust cavities 31 are arranged at the lower ends of the side beams 34 of the frame 30, and the exhaust cavities 31 extend along the length direction of the side beams 34 of the frame 30.

[0058] Specifically, the outer side wall of the exhaust cavity 31 is provided with a hole structure for mounting the explosion-proof valve 20, which can discharge the gas more quickly.

[0059] In the embodiment, by arranging the exhaust cavity 31 at the lower end of the side beam 34 of the frame 30, that is, at the overall bottom, and further arranging the exhaust groove of the flow channel plate 10 at the bottom of the shell, an exhaust structure on the same plane is formed, which is more convenient for forming the overall bottom exhaust structure, prevents gas from rising and affecting other battery cells or other components, and can more quickly exhaust gas. At the same time, by extending the exhaust cavity 31 along the length direction of the side beam 34 of the frame 30, a larger gas gathering cavity can be formed, which is convenient for gas gathering and discharge.

[0060] Optionally, as shown in Figure 1 The battery box body further comprises a connecting piece 50, and the bottom of the frame 30 is connected with the flow channel plate 10 through the connecting piece 50.

[0061] Specifically, the connecting piece 50 is sealing glue, and of course, it can also be other structures such as adhesive tape, as long as it can seal and connect, which is not limited here.

[0062] In the embodiment, by arranging the connecting piece 50 at the bottom of the frame 30 and connecting the flow channel plate 10 through the connecting piece 50, on the one hand, the flow channel plate 10 can be more stably and firmly fixed, and on the other hand, the bottom exhaust structure can be effectively sealed through the connecting piece 50 to prevent gas from rising and affecting other components, thereby further improving the overall safety.

[0063] Optionally, as shown in Figures 1 to 6 The flow channel plate 10 comprises two plate bodies symmetrically arranged with a gap therebetween, the gap is configured as the air inlet 15, and the position of the gap corresponds to the position of a row of exhaust valves 02 of the battery cell module 01.

[0064] Specifically, the number of the flow channel plate 10 can be set to be multiple, preferably two, one flow channel plate 10, that is, two plate bodies correspond to one battery cell module 01, and a row of exhaust valves 02 arranged downward on the battery cell module 01 is arranged in position with the gap between the two plate bodies, that is, the gap above is a row of battery cells and their exhaust valves 02, and the bottom plate 40 is used as the wall body at the bottom, that is, the gap also forms an exhaust flow channel and serves as the air inlet 15 of the exhaust groove, which is more controllable for the exhaust path.

[0065] In the embodiment, the flow channel plate 10 is arranged to have a gap between two plate bodies and is symmetrically arranged, and the gap is used as the air inlet 15 of the exhaust groove and corresponds to the position of the exhaust valve 02 of one row of battery cells. In use, one row of exhaust valves 02 of the battery cell module 01 is located above the gap. The bottom plate 40 is used as the wall body of the bottom. That is, the gap also forms an exhaust flow channel. By using the gap as the air inlet 15 of the exhaust groove, after the exhaust valve 02 of a single battery cell exhausts high-temperature and high-pressure gas in the case of thermal runaway, the high-temperature and high-pressure gas can flow in the exhaust flow channel formed by the gap and can be dispersedly introduced into the plurality of notches 11, that is, into the plurality of grooves and flow into the exhaust groove for exhaust. Thus, a dispersed and uniform exhaust passage is formed, which facilitates pressure and temperature reduction and reduces the impact force and the harm caused by the impact force, thereby further improving the use safety.

[0066] Optionally, as shown in Figure 2 , the side beam 34 of the frame 30 is provided with a second air inlet hole 36 at a position corresponding to the gap. The second air inlet hole 36 is in communication with the explosion-proof valve 20.

[0067] Specifically, the second air inlet hole 36 is also in communication with the exhaust cavity 31. That is, in addition to the first air inlet hole 32 connected to the exhaust port 12 of the flow channel plate 10, the exhaust cavity 31 is also provided with a second air inlet hole 36 at a position corresponding to the gap. That is, the exhaust cavity 31 is provided with a plurality of first air inlet holes 32 and second air inlet holes 36 on the cavity wall towards the inside of the frame 30. The specific structure can be designed according to actual needs and is not limited here.

[0068] In the embodiment, the second air inlet hole 36 is provided on the side beam 34 of the frame 30 at a position corresponding to the gap and is in communication with the explosion-proof valve 20. That is, in use, if thermal runaway occurs, the high-temperature and high-pressure gas exhausted by the exhaust valve 02 of the battery cell to the exhaust flow channel of the gap can be quickly exhausted to the explosion-proof valve 20 through the second air inlet hole 36, which improves the exhaust speed and reduces the probability of danger occurrence, thereby further improving the overall safety.

[0069] Optionally, as shown in Figure 1 and Figure 2 , the battery box body further comprises a heat insulation sheet 60 arranged on the bottom plate 40 at a position corresponding to the gap.

[0070] Specifically, the heat insulation sheet 60 can be a mica sheet mainly composed of polysilicate white mica, quartz, garnet, and rutile, and has the functions of insulation and low thermal resistance, and can well insulate heat. Of course, the heat insulation sheet 60 can also be other heat insulation materials, which are not limited here. Meanwhile, the heat insulation sheet 60 has a rectangular sheet structure and can be attached to the upper end surface of the bottom plate 40.

[0071] In the embodiment, the heat insulation sheet 60 is arranged on the upper end surface of the bottom plate 40 at a position corresponding to the gap, which is also aligned with the exhaust valve 02 of the battery cell. When thermal runaway occurs, the high-temperature and high-pressure gas is sprayed out through the exhaust valve 02, and the heat insulation sheet 60 can effectively prevent the gas from causing thermal damage to the bottom plate 40, that is, prevent the gas from burning through the bottom plate 40, thereby further improving the overall use safety.

[0072] In addition, as shown in Figure 1 , Figure 2 and Figures 8 to 11 , another embodiment of the utility model provides a power battery, which comprises a battery cell module 01 and the above-mentioned battery box body, the battery cell module 01 is arranged in the battery box body, and a heat insulation tape 03 is attached to one row of exhaust valves 02 of the battery cell module 01.

[0073] Exemplarily, two battery cell modules 01 are installed in the battery box body, and one row of exhaust valves 02 is arranged at the lower middle part of each battery cell module 01, that is, a plurality of battery cells are fixed by a steel belt 04 and end plates 05 at both ends to form a battery cell module 01, and one row of downwardly arranged exhaust valves 02 is formed, two rows of exhaust valves 02 of the two battery cell modules 01 are arranged in position in two rows of gaps formed by four flow channel plates 10 arranged in pairs in a symmetrical manner, and the structure is more reasonable and safe.

[0074] In the embodiment, the power battery provided by the embodiment has the same technical effects as the above-mentioned battery box body, which will not be described here. Meanwhile, the heat insulation tape 03 is attached to one row of exhaust valves 02 of the battery cell module 01, as shown in Figure 10 , the heat insulation tape 03 covers one row of exhaust valves 02, Figure 11 , and the schematic view of the heat insulation tape 03 removed and the exhaust valve 02 exposed. When the exhaust valve 02 of a single battery cell discharges high-temperature and high-pressure gas, the gas can burn through the heat insulation tape 03 to form a single hole, so that the remaining most of the heat insulation tape 03 can further prevent the high-temperature and high-pressure gas from affecting the surrounding battery cells, and can further prevent the high-temperature and high-pressure gas from diffusing upward, so that it can enter the air inlet 15 of the flow channel plate 10 in time and quickly, thereby further improving the use safety of the power battery.

[0075] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only.The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall into the protection scope of the utility model.

Claims

1. A battery case, characterized by, The battery box body comprises a shell and a flow channel plate (10), the shell is used for mounting a battery cell module (01), a side wall of the shell is provided with an explosion-proof valve (20), the flow channel plate (10) is connected to the bottom of the shell, the flow channel plate (10) is provided with an exhaust groove, an air inlet (15) and an air outlet (12) respectively communicating with the exhaust groove, the exhaust valve (02) of the battery cell in the battery cell module (01) faces the flow channel plate (10), the position of the exhaust valve (02) corresponds to the position of the air inlet (15), and the air outlet (12) communicates with the explosion-proof valve (20).

2. The battery case according to claim 1, wherein The exhaust groove comprises linear exhaust grooves (13) and non-linear exhaust grooves (14), a plurality of the linear exhaust grooves (13) and a plurality of the non-linear exhaust grooves (14) are staggered and communicated to form the exhaust groove.

3. The battery case according to claim 2, wherein The plurality of the linear exhaust grooves (13) and the plurality of the non-linear exhaust grooves (14) are staggered and communicated to form the exhaust groove, that is, one linear exhaust groove (13) is communicated with one non-linear exhaust groove (14), then communicated with another linear exhaust groove (13), and sequentially extended and communicated to form an exhaust passage, a plurality of the exhaust passages are cross communicated to form the exhaust groove, and the non-linear exhaust groove (14) is a circular groove.

4. The battery case according to claim 1, wherein The shell comprises a frame (30) and a bottom plate (40), the bottom plate (40) is connected to the lower end of the frame (30), the flow channel plate (10) is connected to the frame (30) and arranged above the bottom plate (40).

5. The battery case according to claim 4, wherein The exhaust groove is arranged on the end face of the flow channel plate (10) away from the battery cell module (01).

6. The battery case according to claim 4, wherein The side beam (34) of the frame (30) is provided with an exhaust cavity (31) and a first air inlet hole (32) and an air outlet hole respectively communicating with the exhaust cavity (31), the first air inlet hole (32) is connected with the air outlet (12), and the explosion-proof valve (20) is arranged on the air outlet hole.

7. The battery case according to claim 4, wherein The flow channel plate (10) comprises two plate bodies with a gap therebetween, the gap is configured as the air inlet (15), and the position of the gap corresponds to the position of a row of the exhaust valves (02) of the battery cell module (01).

8. The battery case according to claim 7, wherein The side beam (34) of the frame (30) is provided with a second air inlet hole (36) corresponding to the position of the gap, and the second air inlet hole (36) communicates with the explosion-proof valve (20).

9. The battery case according to claim 7, wherein The battery box body further comprises a heat insulation sheet (60) arranged on the upper end face of the bottom plate (40) corresponding to the position of the gap.

10. A power cell, characterized by The battery box body comprises a battery cell module (01) and any one of the battery box bodies according to claims 1 to 9, the battery cell module (01) is arranged in the battery box body, and a row of the exhaust valves (02) of the battery cell module (01) is attached with a heat insulation tape (03).

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