Box body of battery pack and battery pack

Abstract

The invention relates to a box body of a battery pack and the battery pack, the box body of the battery pack comprises a shell, a first partition plate, a second partition plate, a second partition plate and an exhaust valve, the shell is provided with an accommodating cavity, and the accommodating cavity is used for accommodating a battery cell; the first partition plate is arranged in the containing cavity, a first pressure relief cavity is formed in the first partition plate, the first partition plate is used for being arranged opposite to an anti-explosion valve of the battery cell, and the first pressure relief cavity is used for relieving pressure of the battery cell; the second partition plate is arranged in the containing cavity, a second pressure relief cavity is formed between the second partition plate and the shell, the second pressure relief cavity communicates with the first pressure relief cavity, and the extending direction of the second pressure relief cavity intersects with the extending direction of the first pressure relief cavity; the exhaust valve penetrates through the shell and communicates with the second pressure relief cavity and the outer side of the shell. Through the communication of the first pressure relief cavity and the second pressure relief cavity and the design that the extension directions of the first pressure relief cavity and the second pressure relief cavity intersect, multi-stage pressure relief is realized, the internal pressure of the battery pack is effectively prevented from rapidly rising, the thermal runaway risk is reduced, and the safety and reliability of the battery pack are improved.

Description

Technical Field

[0001] The present application relates to the field of battery energy storage technology, and in particular to a battery pack box and a battery pack. Background Art

[0002] In the related art, when a battery cell experiences thermal runaway, the high-temperature and high-pressure gas generated can easily cause the internal pressure of the battery pack to rise rapidly. This sharp rise in pressure will not only place a great burden on the structure of the battery pack, but may also cause the explosion or rupture of the box, posing a serious safety hazard. Once the box explodes or ruptures, it will not only cause direct physical damage to the surrounding environment and personnel, but may also cause a fire, further increasing the severity of the accident. In addition, the disorderly discharge of high-temperature and high-pressure gases may also cause damage to other battery cells and electronic components inside the battery pack, aggravating the overall failure of the system and making the scope and consequences of the accident even more uncontrollable. Therefore, how to effectively control and manage the pressure inside the battery pack and prevent the various risks brought about by thermal runaway has become a key issue in improving the safety and reliability of the battery pack. Summary of the invention

[0003] The embodiments of the present invention provide a battery pack box and a battery pack, which improve the safety and reliability of the battery pack and at least partially solve the above-mentioned technical problems.

[0004] In order to achieve the above object, according to a first aspect of the present application, a box body of a battery pack is provided, comprising:

[0005] The housing is provided with a housing cavity, wherein the housing cavity is used to accommodate the battery cell;

[0006] A first partition is arranged in the accommodating cavity, a first pressure relief cavity is formed in the first partition, the first partition is used to be arranged relative to the explosion-proof valve of the battery cell, and the first pressure relief cavity is used to relieve pressure on the battery cell;

[0007] a second partition plate disposed in the accommodating chamber, wherein a second pressure relief chamber is formed between the second partition plate and the shell, the second pressure relief chamber is communicated with the first pressure relief chamber, and the extension direction of the second pressure relief chamber intersects with the extension direction of the first pressure relief chamber; and

[0008] An exhaust valve is provided through the shell, and the exhaust valve communicates with the second pressure relief chamber and the outside of the shell.

[0009] Optionally, the shell includes a first end plate and a second end plate that are arranged opposite to each other, the second partition plate is arranged opposite to the first end plate and spaced apart from each other, and the second pressure relief chamber is formed between the second partition plate and the first end plate.

[0010] Optionally, the shell also includes a bottom plate and two side plates arranged opposite to each other, the two side plates, the first end plate and the second end plate are arranged around the periphery of the bottom plate and form the accommodating cavity, the first partition plate is opposite to the bottom plate and arranged at an interval, and the first partition plate is connected to the second partition plate.

[0011] Optionally, the first pressure relief chamber extends along the length direction of the first partition;

[0012] The first partition plate is provided with a first opening toward the second partition plate, and the second partition plate is provided with a second opening communicating with the first opening, and at least a portion of the second opening faces the exhaust valve.

[0013] Optionally, the exhaust valve is penetrated through the first end plate and is arranged in the middle of the first end plate.

[0014] Optionally, the first partition is provided with a pressure relief hole connected to the first pressure relief chamber, and the box body of the battery pack also includes an isolation part, which covers the pressure relief hole. The isolation part is used to correspond to the explosion-proof valve setting of the battery cell and can be separated or ruptured from the first partition to expose the pressure relief hole.

[0015] Optionally, the first partition divides the accommodating cavity into two accommodating spaces, each of which is used to accommodate a battery cell;

[0016] Two first pressure relief chambers are provided in the first partition, and the two first pressure relief chambers are arranged at intervals along the arrangement direction of the two accommodation spaces, and each first pressure relief chamber is used to relieve pressure on the battery cells in the adjacent accommodation space.

[0017] Optionally, the first partition includes a first substrate, a second substrate and a third substrate sequentially arranged along the arrangement direction of the two accommodating spaces, the first substrate and the second substrate are spaced apart to form a first pressure relief cavity, and the second substrate and the third substrate are spaced apart to form another first pressure relief cavity;

[0018] The second substrate is made of a flame retardant material, or the second substrate includes a first side facing the first substrate and a second side facing the third substrate, and at least one of the first side and the second side has a flame retardant layer.

[0019] According to a second aspect of the present application, a battery pack is provided, comprising:

[0020] A box body of a battery pack as described in any one of the above items, and

[0021] The battery cell is arranged in the accommodating cavity.

[0022] Optionally, the battery pack includes a sealing portion, which surrounds the periphery of the explosion-proof valve of the battery cell, and the sealing portion is sealingly connected between the battery cell and the first separator.

[0023] In the box of the battery pack of the embodiment of the present application, through the connection between the first pressure relief chamber and the second pressure relief chamber and the design that their extension directions intersect, after the high-temperature and high-pressure gas flows out from the explosion-proof valve of the battery cell, it passes through the first pressure relief chamber and the second pressure relief chamber according to a predetermined path, and is finally discharged through the exhaust valve. The entire process is carried out through multi-stage pressure relief, which effectively prevents the rapid increase of internal pressure in the battery pack, reduces the risk of thermal runaway, and improves the safety and reliability of the battery pack.

[0024] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0026] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0027] Figure 1 is a schematic structural diagram of a box body of a battery pack disclosed herein;

[0028] Figure 2 yes Figure 1 A schematic cross-sectional view of a battery pack box;

[0029] Figure 3 yes Figure 2 An enlarged schematic diagram of a local A in FIG.

[0030] Figure 4 yes Figure 1 Schematic diagram of the raw materials of the first partition and the shell;

[0031] Figure 5 yes Figure 4 Schematic diagram of raw material processing of the first partition and the shell;

[0032] Figure 6 is a schematic structural diagram of a battery pack disclosed herein;

[0033] Figure 7 yes Figure 6 A schematic cross-sectional view of a battery pack in FIG.

[0034] Figure 8 yes Figure 7 A partial schematic diagram of the battery pack.

[0035] Description of reference numerals:

[0036] 1000, battery pack; 100, box body; 1, shell; 11, first end plate; 12, second end plate; 13, bottom plate; 14, side plate; 15, cover plate; 2, first partition plate; 21, first opening; 22, pressure relief hole; 23, first substrate; 24, second substrate; 25, third substrate; 3, second partition plate; 31, second opening; 4, first pressure relief chamber; 5, second pressure relief chamber; 6, exhaust valve; 7, isolation part; 8, flame retardant layer; 9, accommodating space; 200, battery cell; 300, sealing part. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0038] The present application provides a box for a battery pack. Figures 1 to 5 A schematic diagram of the structure of the battery pack box provided in an embodiment of the present application.

[0039] See also Figure 1 ( Figure 1 The bottom plate 13, the cover plate 15 and the exhaust valve 6 are not installed in the box body 100 of the battery pack 1000, and the box body 100 includes a shell 1, a first partition plate 2, a second partition plate 3, and an exhaust valve 6 (combined with Figure 6 ).

[0040] The housing 1 is provided with a receiving cavity, which is used to receive the battery cell 200 (refer to Figure 7 ), the shell 1 is intended to provide a stable working environment for the battery cell 200 and effectively protect the battery cell 200.

[0041] The first partition plate 2 is disposed in the accommodating cavity, and a first pressure relief cavity 4 is formed in the first partition plate 2 (see Figure 2 and Figure 3), the first partition 2 is used for the explosion-proof valve arrangement relative to the battery cell 200, and the first pressure relief chamber 4 is used for relieving pressure on the battery cell 200; the second partition 3 is arranged in the accommodating chamber, and a second pressure relief chamber 5 is formed between the second partition 3 and the shell 1, the second pressure relief chamber 5 is connected to the first pressure relief chamber 4, and the second pressure relief chamber 5 intersects with the extension direction of the first pressure relief chamber 4 (the extension direction of the second pressure relief chamber 5 is shown by arrow b in the figure, and the extension direction of the first pressure relief chamber 4 is shown by arrow a in the figure), and the exhaust valve 6 is penetrated in the shell 1, and the exhaust valve 6 is connected to the second pressure relief chamber 5 and the outside of the shell 1 (reference Figure 6 , Figure 7 and Figure 8 ). When the battery cell 200 has a thermal runaway, since the first pressure relief chamber 4 in the first partition 2 is arranged relative to the explosion-proof valve of the battery cell 200, the high-pressure gas generated by the battery cell 200 first enters the first pressure relief chamber 4, and the initial pressure is effectively taken over and initially released. Due to the existence of the first pressure relief chamber 4, the high-pressure gas inside the battery cell 200 is prevented from directly impacting other structures inside the battery pack 1000 box 100, and the pressure is controlled within a relatively small range, which plays a preliminary protective role. Then, the gas flows from the first pressure relief chamber 4 into the second pressure relief chamber 5 which is connected to it and intersects with it in the extension direction. This intersecting structural design allows the gas to change direction during the flow, reduce the flow rate, and further disperse the pressure. Just like setting a bend in a river to slow down the water flow rate, the gas pressure is better controlled in this process. Finally, the gas after two stages of pressure relief is discharged to the outside of the shell 1 through the exhaust valve 6. The whole process effectively prevents the rapid increase of the internal pressure of the battery pack 1000 through multi-stage pressure relief, greatly reduces the risk of explosion or rupture of the box 100 due to excessive pressure, and significantly improves the safety of the battery pack 1000. The existence of the first pressure relief chamber 4 and the second pressure relief chamber 5 provides a buffer space for high-pressure gas. When high-pressure gas is generated due to thermal runaway, the gas gradually releases pressure in these two pressure relief chambers, avoiding the gas from directly impacting other components such as the exhaust valve 6 with excessive pressure. This can reduce the possibility of the exhaust valve 6 being damaged due to excessive pressure, extend the service life of the exhaust valve 6, and also protect other pressure-related components of the battery pack 1000 box 100 from damage caused by the impact of excessive pressure. The connection between the first pressure relief chamber 4 and the second pressure relief chamber 5 and the design of their intersecting extension directions optimize the flow path of the gas. After the gas flows out from the explosion-proof valve of the battery cell 200, it passes through the first pressure relief chamber 4 and the second pressure relief chamber 5 along a predetermined path, and is finally discharged through the exhaust valve 6. This orderly gas flow path can prevent the disorderly movement of gas inside the battery pack 1000, avoid problems such as excessive local pressure or accidental impact on other components caused by chaotic gas flow, so that the gas can be discharged from the battery pack 1000 efficiently and safely.

[0042] That is, in the technical solution of the present application, through the connection between the first pressure relief chamber 4 and the second pressure relief chamber 5 and the design that their extension directions intersect, after the high-temperature and high-pressure gas flows out from the explosion-proof valve of the battery cell 200, it passes through the first pressure relief chamber 4 and the second pressure relief chamber 5 according to a predetermined path, and is finally discharged through the exhaust valve 6. The entire process is carried out through multi-stage pressure relief, which effectively prevents the rapid increase of internal pressure of the battery pack 1000 and reduces component damage. The gas can be discharged from the battery pack 1000 efficiently and safely, thereby improving the safety and reliability of the battery pack 1000.

[0043] In some embodiments, see Figure 1 , Figure 2 and Figure 3 The housing 1 includes a first end plate 11 and a second end plate 12 which are arranged opposite to each other. The second partition plate 3 is arranged opposite to the first end plate 11 and spaced apart from each other. A second pressure relief chamber 5 is formed between the second partition plate 3 and the first end plate 11. In these implementations, the second pressure relief chamber 5 is formed by cooperating the second partition plate 3 with the first end plate 11 which is arranged opposite to each other. The first end plate 11 is a part of the housing 1 of the battery pack 1000 and is an existing structural component. The second pressure relief chamber 5 is constructed by using it to be arranged opposite to the second partition plate 3 and spaced apart from each other. It does not need to occupy too much extra space to specially set up an independent pressure relief chamber structure, thereby improving the utilization rate of the internal space of the battery pack 1000. The second pressure relief chamber 5 defined by the first end plate 11 is close to the outside of the housing 1. When the gas is discharged from the second pressure relief chamber 5 through the exhaust valve 6, the path of the gas to the outside is shorter and the resistance is smaller. This helps to release the high-pressure gas inside the battery pack 1000 to the outside more efficiently, further improves the pressure release capability of the battery pack 1000 in response to thermal runaway, and enhances the safety of the battery pack 1000. In addition, since the second pressure relief chamber 5 is close to the outside of the shell 1, it is beneficial for heat to be transferred to the external environment of the battery pack 1000 more quickly, thereby reducing the temperature inside the battery pack 1000 and reducing the possibility of further damage to other components inside the battery pack 1000 (such as the battery cell 200, circuit board, etc.) due to high temperature. The second pressure relief chamber 5 close to the outside is also easier to maintain and inspect, saving maintenance costs.

[0044] In some embodiments, see Figure 6 , Figure 7 and Figure 8The shell 1 also includes a bottom plate 13 and two side plates 14 arranged opposite to each other. The two side plates 14, the first end plate 11 and the second end plate 12 are arranged around the periphery of the bottom plate 13 to form a accommodating chamber. The first partition plate 2 is opposite to the bottom plate 13 and is arranged at an interval. The first partition plate 2 is connected to the second partition plate 3. In these embodiments, the first partition plate 2 is connected to the second partition plate 3, so that the connection between the first pressure relief chamber 4 and the second pressure relief chamber 5 is more stable and direct. When the battery cell 200 has a thermal runaway, the gas released from the explosion-proof valve of the battery cell 200 enters the first pressure relief chamber 4 and can flow into the second pressure relief chamber 5 more smoothly through the connected first partition plate 2 and the second partition plate 3. This coherent structural design optimizes the pressure relief path, avoids leakage or obstruction of gas during transmission, improves the pressure relief efficiency, and thus better ensures the safety performance of the battery pack 1000. For details, see. Figure 3 , the first partition 2 is vertically connected to the second partition 3.

[0045] In some embodiments, see Figure 3 The first pressure relief chamber 4 extends along the length direction of the first partition plate 2 (as shown by arrow a in the figure); the first partition plate 2 is provided with a first opening 21 toward the second partition plate 3, and the second partition plate 3 is provided with a second opening 31 connected to the first opening 21, and at least part of the second opening 31 is directly opposite to the exhaust valve 6 (combined with Figure 8 ). In these embodiments, the first pressure relief chamber 4 extends along the length direction of the first partition 2. This design provides a longer path for the flow of gas in the first pressure relief chamber 4. When thermal runaway occurs in the battery cell 200, the gas can diffuse rapidly along the length direction of the first pressure relief chamber 4, increasing the buffer space of the gas and preliminarily reducing the gas pressure. The first partition 2 is provided with a first opening 21 toward the second partition 3, and the second partition 3 is provided with a second opening 31 connected to the first opening 21, and at least part of the second opening 31 is directly opposite the exhaust valve 6. This structural design makes the flow path of the gas from the first pressure relief chamber 4 to the second pressure relief chamber 5 and then to the exhaust valve 6 more direct. The gas can flow quickly from the first pressure relief chamber 4 to the second pressure relief chamber 5 through the connected openings, and then efficiently flow to the exhaust valve 6 for discharge, reducing the resistance of the gas during the flow process, greatly improving the efficiency of pressure relief, and thereby enhancing the safety of the battery pack 1000 in dealing with thermal runaway.

[0046] In some embodiments, see Figure 6 , Figure 7 and Figure 8, the exhaust valve 6 is provided through the first end plate 11, and is provided in the middle of the first end plate 11. In these embodiments, since the second pressure relief chamber 5 is formed by the first end plate 11 and the second partition plate 3 spaced relatively from the first end plate 11, and the exhaust valve 6 is located in the middle of the first end plate 11, when thermal runaway occurs, the gas diffuses in the second pressure relief chamber 5. Since the exhaust valve 6 is in the central position, the path of gas flow to the exhaust valve 6 is relatively balanced, and there is no excessive or insufficient gas pressure on one side due to the eccentric position of the exhaust valve 6. Gases in all directions can converge to the exhaust valve 6 more evenly. Since the gas pressure in the second pressure relief chamber 5 is more evenly dispersed and then discharged from the exhaust valve 6, the stability of the pressure relief process is guaranteed. The uniform pressure dispersion and stable pressure relief help maintain the overall safety of the battery pack 1000 in the case of thermal runaway.

[0047] In some embodiments, see Figure 3 , the first partition 2 is provided with a pressure relief hole 22 connected to the first pressure relief chamber 4, and the box 100 of the battery pack 1000 also includes an isolating portion 7, the isolating portion 7 covers the pressure relief hole 22, and the isolating portion 7 is used to correspond to the explosion-proof valve of the battery cell 200 and can be separated or broken from the first partition 2 to expose the pressure relief hole 22. In these embodiments, when the battery cell 200 works normally, the isolating portion 7 remains intact and covers the pressure relief hole 22. The isolating portion 7 can effectively isolate the battery cell 200 and the first pressure relief chamber 4, preventing the surrounding environment of the battery cell 200 from being affected by abnormal factors that may exist in the first pressure relief chamber 4, and also preventing the first pressure relief chamber 4 from being disturbed by impurities in the surrounding environment of the battery cell 200; when the battery cell 200 has thermal runaway and the explosion-proof valve of the battery cell 200 is activated, the isolating portion 7 is separated or broken from the first partition 2, allowing the gas to pass through and enter the first pressure relief chamber 4 through the pressure relief air, meeting the pressure relief requirements and improving the overall safety and stability of the battery pack 1000. Specifically, the isolation part 7 is a mica sheet, which is resistant to high temperatures and is insulating, and can effectively prevent heat from spreading.

[0048] In some embodiments, see Figure 7 and Figure 8, the first partition 2 divides the accommodating cavity into two accommodating spaces 9, each accommodating space 9 is used to accommodate the battery cell 200; two first pressure relief chambers 4 are arranged in the first partition 2, and the two first pressure relief chambers 4 are arranged at intervals along the arrangement direction of the two accommodating spaces 9 (as shown by arrow b in the accompanying drawings), and each first pressure relief chamber 4 is used to relieve pressure on the battery cell 200 in the adjacent accommodating space 9. In these embodiments, each first pressure relief chamber 4 is used to relieve pressure on the battery cell 200 in the adjacent accommodating space 9, so that the battery cell 200 in each accommodating space 9 can be pressure-relieved relatively independently, and the battery cells 200 in the two accommodating spaces 9 are all pressure-relieved to the first pressure relief chamber 4 located in the middle position, so that the pressure release path is relatively short and balanced, which helps to quickly discharge the high-temperature and high-pressure gas generated by the battery cell 200, and improves the overall safety and stability of the battery pack 1000.

[0049] In some embodiments, see Figure 8 The first partition 2 includes a first substrate 23, a second substrate 24 and a third substrate 25 which are sequentially arranged along the arrangement direction of the two accommodating spaces 9. The first substrate 23 and the second substrate 24 are spaced apart to form a first pressure relief chamber 4, and the second substrate 24 and the third substrate 25 are spaced apart to form another first pressure relief chamber 4; the material of the second substrate 24 is a flame retardant material. In these embodiments, the first substrate 23 and the second substrate 24 are spaced apart to form a first pressure relief chamber 4, and the second substrate 24 and the third substrate 25 are spaced apart to form another first pressure relief chamber 4. If a battery cell 200 in one accommodating space 9 undergoes thermal runaway and generates flames, the flame retardant second substrate 24 can prevent the flame from spreading through the first pressure relief chamber 4 to Another accommodating space 9 is formed, thereby protecting the safety of the battery cell 200 in the other accommodating space 9 and other components of the battery pack 1000 and reducing the risk of fire and explosion of the battery pack 1000 as a whole. In addition, each first pressure relief chamber 4 is used to relieve pressure on the battery cell 200 in the adjacent accommodating space 9. That is, when the battery cell 200 is thermally runaway, the high-temperature and high-pressure gas will relatively impact the second substrate 24. The flame retardant property of the second substrate 24 enables it to ensure its own structural integrity in the process of being impacted by the high-temperature and high-pressure gas to maintain the normal function of the two first pressure relief chambers 4. Since the second substrate 24 can effectively prevent the spread of flames and remain stable under the impact of high-temperature and high-pressure gas, the reliability of the entire battery pack 1000 is improved. In some embodiments, see Figure 3, the second substrate 24 includes a first side facing the first substrate 23 and a second side facing the third substrate 25, and at least one of the first side and the second side has a flame retardant layer 8. In these embodiments, the flame retardant layer 8 is provided on the first side and / or the second side of the second substrate 24, thereby enhancing the flame retardant ability of the second substrate 24. If the flame rushes from the side of the first substrate 23 to the second substrate 24, the flame retardant layer 8 on the first side can directly contact the flame and inhibit its spread. Similarly, if the flame approaches the second substrate 24 from the side of the third substrate 25, the flame retardant layer 8 on the second side can also play a role in preventing the flame, thereby improving the reliability of preventing the flame from spreading to another accommodating space 9 through the first pressure relief chamber 4. It can be understood that the flame retardant layer 8 is provided on both the first side and the second side of the second substrate 24 (as shown in FIG. 2 ). Figure 3 As shown), it can provide more comprehensive protection for the battery pack 1000. Specifically, the configuration is as follows Figure 4 The aluminum extruded profile of the structure shown in the figure comprises a first partition plate 2 and two side plates 14. The first partition plate 2 comprises a first base plate 23, a second base plate 24 and a third base plate 25. The aluminum extruded profile is processed, and a pressure relief hole 22 is provided on the first base plate 23 and the third base plate 25 to form a Figure 5 The structure shown in FIG. 1 is then provided with an isolation portion 7 and a flame retardant layer 8, and a first end plate 11 and a second end plate 12 are installed to form a structure as shown in FIG. Figure 1 The box body 100 shown in the figure is further installed with a bottom plate 13 and a cover plate 15 for protection and sealing, so as to form a Figure 6 The box 100 is shown.

[0050] See Figure 6 , Figure 7 and Figure 8 According to the second aspect of the present application, a battery pack 1000 is provided, including a case 100 and a battery cell 200. The structure of the case 100 of the battery pack 1000 is as described above, and the battery cell 200 is arranged in the accommodating cavity. Since the battery pack 1000 adopts all the technical solutions of all the above-mentioned embodiments, it at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0051] In some embodiments, see Figure 8The battery pack 1000 includes a sealing portion 300, which surrounds the periphery of the explosion-proof valve of the battery cell 200. The sealing portion 300 is sealed and connected between the battery cell 200 and the first partition 2. In these embodiments, when the explosion-proof valve of the battery cell 200 is activated and releases high-temperature and high-pressure gas, these gases will not diffuse into the environment around the battery cell 200 with thermal runaway, affecting or damaging other battery cells 200. Due to the presence of the sealing portion 300, the gas will be directly guided into the first pressure relief chamber 4 inside the first partition 2, which can not only effectively limit the scope of influence of thermal runaway and prevent the fault from spreading from one battery cell 200 to the entire battery pack, but also ensure that the gas enters the first pressure relief chamber 4 in an orderly manner, thereby better controlling the internal pressure and reducing potential safety hazards. In addition, the addition of the sealing portion 300 also helps to fix the battery cell 200 and improve its stability. Specifically, the outer peripheral side of the battery cell 200 is arranged beyond the corresponding isolation part 7, so that the end of the battery cell 200 provided with the explosion-proof valve has a protruding part surrounding the periphery of the explosion-proof valve, and the sealing part 300 is connected between the protruding part and the first partition 2. In these embodiments, the sealing part 300 is connected between the protruding part and the first partition 2, which can avoid occupying the peripheral space of the battery cell 200. While ensuring the independent thermal safety management of the battery cell 200, the multiple battery cells 200 in the accommodating space 9 can be more compact, thereby improving the space utilization. Specifically, the sealing part 300 is a ring-shaped structural colloid.

[0052] According to the third aspect of the present application, an electric device is provided, including a battery pack 1000. The structure of the battery pack 1000 is as described above. Since the electric device adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The present application does not specifically limit the type of electric device, and the electric device includes but is not limited to automobiles, ships, household appliances, and industrial equipment.

[0053] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0054] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0055] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0056] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A battery pack box, characterized in that: include: The housing is provided with a housing cavity, wherein the housing cavity is used to accommodate the battery cell; A first partition is arranged in the accommodating cavity, a first pressure relief cavity is formed in the first partition, the first partition is used to be arranged relative to the explosion-proof valve of the battery cell, and the first pressure relief cavity is used to relieve pressure on the battery cell; a second baffle, disposed in the accommodating cavity, wherein a second pressure relief cavity is formed between the second baffle and the shell, the second pressure relief cavity is communicated with the first pressure relief cavity, and the extension directions of the second pressure relief cavity and the first pressure relief cavity intersect; as well as, An exhaust valve is provided through the shell, and the exhaust valve communicates with the second pressure relief chamber and the outside of the shell.

2. The box of the battery pack according to claim 1, characterized in that: The shell includes a first end plate and a second end plate that are opposite to each other. The second partition plate is opposite to and spaced from the first end plate. The second pressure relief chamber is formed between the second partition plate and the first end plate.

3. The box of the battery pack according to claim 2, characterized in that: The shell also includes a bottom plate and two side plates arranged opposite to each other. The two side plates, the first end plate and the second end plate are arranged around the periphery of the bottom plate to form the accommodating cavity. The first partition plate is opposite to the bottom plate and arranged at an interval. The first partition plate is connected to the second partition plate.

4. The box of the battery pack according to claim 3, characterized in that: The first pressure relief chamber extends along the length direction of the first partition; The first partition plate is provided with a first opening toward the second partition plate, and the second partition plate is provided with a second opening communicating with the first opening, and at least a portion of the second opening faces the exhaust valve.

5. The box of the battery pack according to claim 2, characterized in that: The exhaust valve is disposed through the first end plate and is arranged in the middle of the first end plate.

6. The box of the battery pack according to any one of claims 1 to 5, characterized in that: The first partition is provided with a pressure relief hole connected to the first pressure relief chamber, and the box body of the battery pack also includes an isolation part, which covers the pressure relief hole. The isolation part is used to correspond to the explosion-proof valve setting of the battery cell and can be separated or ruptured from the first partition to expose the pressure relief hole.

7. The box of the battery pack according to any one of claims 1 to 5, characterized in that: The first partition divides the accommodating cavity into two accommodating spaces, each of which is used to accommodate a battery cell; Two first pressure relief chambers are provided in the first partition, and the two first pressure relief chambers are arranged at intervals along the arrangement direction of the two accommodation spaces, and each first pressure relief chamber is used to relieve pressure on the battery cells in the adjacent accommodation space.

8. The box of the battery pack according to claim 7, characterized in that: The first partition includes a first substrate, a second substrate and a third substrate sequentially arranged along the arrangement direction of the two accommodation spaces, the first substrate and the second substrate are arranged at intervals to form a first pressure relief cavity, and the second substrate and the third substrate are arranged at intervals to form another first pressure relief cavity; The second substrate is made of a flame retardant material, or the second substrate includes a first side facing the first substrate and a second side facing the third substrate, and at least one of the first side and the second side has a flame retardant layer.

9. A battery pack, characterized in that: include: A box body of a battery pack as claimed in any one of claims 1 to 8, and The battery cell is arranged in the accommodating cavity.

10. The battery pack according to claim 9, characterized in that: The battery pack includes a sealing portion, which surrounds the periphery of the explosion-proof valve of the battery cell, and the sealing portion is sealingly connected between the battery cell and the first separator.

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