Box body of battery pack and battery pack

Abstract

The utility model 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 technical field of battery energy storage, and in particular to a battery pack box and a battery pack. BACKGROUND

[0002] In related technologies, when a battery cell experiences thermal runaway, the high-temperature and high-pressure gas generated is likely to cause the internal pressure of the battery pack to rapidly increase. This rapid pressure rise not only places a great burden on the structure of the battery pack, but also can cause the box to explode or rupture, posing a serious safety hazard. Once the box explodes or ruptures, not only will it cause direct physical harm to the surrounding environment and personnel, but it can also trigger a fire, further exacerbating the severity of the accident. In addition, the disordered discharge of high-temperature and high-pressure gas can also cause other battery cells and electronic components inside the battery pack to be damaged, exacerbating the overall failure of the system and making the impact range and consequences of the accident even more uncontrollable. Therefore, how to effectively control and manage the pressure inside the battery pack to prevent various risks caused by thermal runaway has become a key issue in improving the safety and reliability of the battery pack. SUMMARY

[0003] Embodiments of the present application provide a battery pack box and a battery pack, which improve the safety and reliability of the battery pack to at least partially solve the above technical problems.

[0004] To achieve the above-mentioned purpose, according to a first aspect of the present application, a battery pack box is provided, comprising:

[0005] a housing provided with a receiving cavity, the receiving cavity being used to accommodate a battery cell;

[0006] a first partition plate arranged in the receiving cavity, a first pressure relief cavity being formed in the first partition plate, the first partition plate being arranged relative to an explosion-proof valve of the battery cell, and the first pressure relief cavity being used to relieve pressure of the battery cell;

[0007] a second partition plate arranged in the receiving cavity, a second pressure relief cavity being formed between the second partition plate and the housing, the second pressure relief cavity being in communication with the first pressure relief cavity, and the extension direction of the second pressure relief cavity intersecting the extension direction of the first pressure relief cavity; and

[0008] an exhaust valve penetrating the housing, the exhaust valve being in communication with the second pressure relief cavity and the outside of the housing.

[0009] Optionally, the housing comprises a first end plate and a second end plate arranged opposite to each other, the second partition plate is arranged opposite to and spaced apart from the first end plate, and the second pressure relief cavity is formed between the second partition plate and the first end plate.

[0010] Optionally, the shell further comprises a bottom plate and two oppositely arranged side plates, 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 arranged opposite to and spaced apart from the bottom plate, and the first partition plate is connected with the second partition plate.

[0011] Optionally, the first pressure relief cavity extends along the length direction of the first partition plate.

[0012] The first partition plate is provided with a first opening facing the second partition plate, the second partition plate is provided with a second opening in communication with the first opening, and at least part of the second opening faces the exhaust valve.

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

[0014] Optionally, the first partition plate is provided with a pressure relief hole in communication with the first pressure relief cavity, and the box of the battery pack further comprises an isolation part covering the pressure relief hole, the isolation part is arranged corresponding to the explosion-proof valve of the battery cell and can be separated or broken from the first partition plate to expose the pressure relief hole.

[0015] Optionally, the first partition plate divides the accommodating cavity into two accommodating spaces, and each of the accommodating spaces is used for accommodating a battery cell.

[0016] The first partition plate is provided with two first pressure relief cavities, and the two first pressure relief cavities are arranged spaced apart along the arrangement direction of the two accommodating spaces, and each of the first pressure relief cavities is used for relieving pressure of the battery cell in the adjacent accommodating space.

[0017] Optionally, the first partition plate comprises a first base plate, a second base plate and a third base plate arranged in sequence along the arrangement direction of the two accommodating spaces, the first base plate and the second base plate are arranged spaced apart and form a first pressure relief cavity, and the second base plate and the third base plate are arranged spaced apart and form another first pressure relief cavity.

[0018] The second base plate is made of a flame-retardant material, or the second base plate comprises a first side facing the first base plate and a second side facing the third base plate, 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] The box of the battery pack according to any one of the above, and

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

[0022] Optionally, the battery pack comprises a sealing portion surrounding a periphery of the explosion-proof valve of the battery cell, the sealing portion being sealingly connected between the battery cell and the first partition plate.

[0023] In the box of the battery pack of the embodiment, through the communication of the first pressure relief cavity and the second pressure relief cavity and the design that the extension directions thereof intersect, after the high-temperature and high-pressure gas flows out from the explosion-proof valve of the battery cell, the high-temperature and high-pressure gas passes through the first pressure relief cavity and the second pressure relief cavity according to a predetermined path, and finally is discharged through the exhaust valve, the whole process is discharged through multiple stages, which effectively prevents the rapid increase of the internal pressure of 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 following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

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

[0027] Figure 1 is a structural schematic diagram of a box of a battery pack of the present disclosure;

[0028] Figure 2 is Figure 1 is a sectional view of the box of the battery pack in

[0029] Figure 3 is Figure 2 is an enlarged schematic diagram of the local part A in

[0030] Figure 4 is Figure 1 is a raw material schematic diagram of the first partition plate and the shell in

[0031] Figure 5 is a raw material processing schematic diagram of the first partition plate and the shell in Figure 4

[0032] Figure 6 is a structural schematic diagram of a battery pack of the present disclosure;

[0033] Figure 7 is Figure 6 is a sectional view of the battery pack in ​

[0034] Figure 8 is Figure 7 is a partial schematic view of a battery pack in

[0035] BRIEF DESCRIPTION OF DRAWINGS

[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 base plate; 24, second base plate; 25, third base plate; 3, second partition plate; 31, second opening; 4, first pressure relief cavity; 5, second pressure relief cavity; 6, exhaust valve; 7, isolation part; 8, fireproof layer; 9, containing space; 200, battery cell; 300, sealing part. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative labor are within the protection scope of the present application.

[0038] The present application provides a box body of a battery pack, Figures 1 to 5 is a structural schematic view of a box body of a battery pack provided by the embodiments of the present application.

[0039] Please refer to Figure 1 ( Figure 1 without the bottom plate 13, the cover plate 15 and the exhaust valve 6 in Figure 6 ), the box body 100 of the battery pack 1000 comprises a shell 1, a first partition plate 2, a second partition plate 3 and an exhaust valve 6 (in combination with

[0040] The shell 1 is provided with a containing cavity for containing the battery cell 200 (refer to Figure 7 ), and the shell 1 aims to provide a stable working environment for the battery cell 200 and can effectively protect the battery cell 200.

[0041] The first partition plate 2 is arranged in the containing cavity, and the first partition plate 2 is formed with a first pressure relief cavity 4 (see Figure 2 and Figure 3), the first partition plate 2 is arranged relative to the explosion-proof valve of the battery cell 200, and the first pressure relief cavity 4 is used to relieve the pressure of the battery cell 200; the second partition plate 3 is arranged in the accommodating cavity, and the second pressure relief cavity 5 is formed between the second partition plate 3 and the shell 1, the second pressure relief cavity 5 is communicated with the first pressure relief cavity 4, and the extension directions of the second pressure relief cavity 5 and the first pressure relief cavity 4 intersect (the extension direction of the second pressure relief cavity 5 is shown by an arrow b in the figure, and the extension direction of the first pressure relief cavity 4 is shown by an arrow a in the figure), and the exhaust valve 6 is arranged in the shell 1 and is communicated between the second pressure relief cavity 5 and the outside of the shell 1 (for reference Figure 6 、 Figure 7 and Figure 8 ). When the battery cell 200 occurs thermal runaway, because the first pressure relief cavity 4 in the first partition plate 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 cavity 4, effectively receiving and preliminarily releasing the initial pressure. Because of the existence of the first pressure relief cavity 4, the high-pressure gas in the battery cell 200 directly impacts other structures in the battery pack 1000 box 100 is avoided, and the pressure is controlled in a relatively small range, which plays a preliminary protection role. Then, the gas flows from the first pressure relief cavity 4 into the second pressure relief cavity 5 which is communicated with it and has an intersecting extension direction. This intersecting structure design makes the gas change direction during flow, the flow rate is reduced, and the pressure is further dispersed. Just like setting a bend in a river, the water flow rate will slow down, the gas pressure is better controlled in this process. Finally, the gas after two-stage pressure relief is discharged to the outside of the shell 1 through the exhaust valve 6. The whole process is through multi-stage pressure relief, effectively preventing the rapid rise of the internal pressure of the battery pack 1000, greatly reducing the risk of explosion or rupture of the box 100 due to excessive pressure, and significantly improving the safety of the battery pack 1000. The existence of the first pressure relief cavity 4 and the second pressure relief cavity 5 provides a buffer space for the high-pressure gas, and when the high-pressure gas is generated during thermal runaway, the gas gradually releases the pressure in the two pressure relief cavities, avoiding the gas directly impacting the exhaust valve 6 and other components at a high pressure, which can reduce the possibility of damage to the exhaust valve 6 due to bearing excessive pressure, prolong 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 excessive pressure impact. The communication of the first pressure relief cavity 4 and the second pressure relief cavity 5 and the intersecting design of their extension directions optimize the gas flow path. After the gas flows out of the explosion-proof valve of the battery cell 200, it follows the predetermined path through the first pressure relief cavity 4 and the second pressure relief cavity 5, and finally is discharged through the exhaust valve 6. This orderly gas flow path can prevent the gas from randomly flowing in the battery pack 1000, avoid local pressure being too high or accidental impact on other components due to chaotic gas flow, and enable the gas to be efficiently and safely discharged from the battery pack 1000.

[0042] That is, in the technical solution of the present application, through the communication of the first pressure relief cavity 4 and the second pressure relief cavity 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 cavity 4 and the second pressure relief cavity 5 according to the predetermined path, and finally is discharged through the exhaust valve 6. The whole process is discharged through multiple stages, effectively preventing the rapid rise of the internal pressure of the battery pack 1000, reducing the damage to the components, and the gas can be efficiently and safely discharged from the battery pack 1000, improving the safety and reliability of the battery pack 1000.

[0043] In some embodiments, see Figure 1 、 Figure 2 and Figure 3 , the shell 1 includes a first end plate 11 and a second end plate 12 arranged opposite to each other, the second partition plate 3 is arranged opposite to and spaced apart from the first end plate 11, and the second pressure relief cavity 5 is formed between the second partition plate 3 and the first end plate 11. In these embodiments, the second pressure relief cavity 5 is formed by cooperating the second partition plate 3 with the first end plate 11 arranged opposite to each other. The first end plate 11 is a part of the shell 1 of the battery pack 1000 and is a structure component already in existence. The second pressure relief cavity 5 is constructed by using the first end plate 11 arranged opposite to and spaced apart from the second partition plate 3, without the need to occupy too much space to specially set up an independent pressure relief cavity structure, thereby improving the utilization rate of the internal space of the battery pack 1000. The second pressure relief cavity 5 defined by the first end plate 11 is close to the outer side of the shell 1, and when the gas is discharged from the second pressure relief cavity 5 through the exhaust valve 6, the path of the gas to the outside is shorter and the resistance is smaller. This helps to more efficiently release the high-pressure gas in the battery pack 1000 to the outside, further improves the pressure release capability of the battery pack 1000 when dealing with thermal runaway, and enhances the safety of the battery pack 1000. In addition, since the second pressure relief cavity 5 is close to the outer side of the shell 1, it is beneficial to more quickly conduct heat to the external environment of the battery pack 1000, reduce the temperature in the battery pack 1000, and reduce the possibility of further damage to other components (such as battery cells 200, circuit boards, etc.) in the battery pack 1000 due to high temperature. The second pressure relief cavity 5 close to the outer side is also easier to maintain and check, saving maintenance costs.

[0044] In some embodiments, see Figure 6 、 Figure 7 and Figure 8The shell 1 further comprises a bottom plate 13 and two oppositely arranged side plates 14, the two side plates 14, the first end plate 11 and the second end plate 12 being arranged around the periphery of the bottom plate 13 and forming a containing cavity, the first partition plate 2 being arranged opposite to and spaced apart from the bottom plate 13, and the first partition plate 2 being connected with the second partition plate 3. In these embodiments, the first partition plate 2 is connected with the second partition plate 3, so that the connection between the first pressure relief cavity 4 and the second pressure relief cavity 5 is more stable and direct. When the battery cell 200 experiences thermal runaway, the gas released from the explosion-proof valve of the battery cell 200 can more smoothly flow into the second pressure relief cavity 5 through the connected first partition plate 2 and second partition plate 3 after entering the first pressure relief cavity 4. This continuous structural design optimizes the pressure relief path, avoids leakage or obstruction of the gas during transmission, improves the pressure relief efficiency, and thus better guarantees the safety performance of the battery pack 1000. Specifically, see Figure 3 The first partition plate 2 is connected perpendicularly with the second partition plate 3.

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

[0046] In some embodiments, see Figure 6 , Figure 7 and Figure 8The exhaust valve 6 is arranged in the first end plate 11 and in the middle of the first end plate 11. In these embodiments, since the second pressure relief cavity 5 is formed by the first end plate 11 and the second partition plate 3 opposite to 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 cavity 5. Since the exhaust valve 6 is located in the center, the path of the gas flowing to the exhaust valve 6 is relatively balanced, and there is no situation that the gas pressure on one side is too large or too small due to the eccentric position of the exhaust valve 6. The gas in each direction can be more uniformly gathered to the exhaust valve 6. Since the gas pressure in the second pressure relief cavity 5 is uniformly dispersed and then discharged from the exhaust valve 6, the stability of the pressure relief process is ensured. Uniform pressure dispersion and stable pressure relief help to 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 plate 2 is provided with a pressure relief hole 22 communicating with the first pressure relief cavity 4. The battery pack 1000 further includes a separation part 7 covering the pressure relief hole 22. The separation part 7 is arranged corresponding to the explosion-proof valve of the battery cell 200 and can be separated or broken from the first partition plate 2 to expose the pressure relief hole 22. In these embodiments, when the battery cell 200 is working normally, the separation part 7 remains intact and covers the pressure relief hole 22. The separation part 7 can effectively isolate the battery cell 200 and the first pressure relief cavity 4, avoid the influence of abnormal factors possibly existing in the first pressure relief cavity 4 on the surrounding environment of the battery cell 200, and prevent the first pressure relief cavity 4 from being interfered by impurities in the surrounding environment of the battery cell 200. When the battery cell 200 occurs thermal runaway and the explosion-proof valve of the battery cell 200 is started, the separation part 7 is separated or broken from the first partition plate 2, so that the gas can pass through and enter the first pressure relief cavity 4 through the pressure relief hole, meet the pressure relief demand, and improve the overall safety and stability of the battery pack 1000. Specifically, the separation part 7 is a mica sheet, which is high-temperature resistant and insulating, and effectively prevents heat spread.

[0048] In some embodiments, see Figure 7 and Figure 8, the first partition plate 2 divides the containing cavity into two containing spaces 9, each containing space 9 is used for containing the battery cell 200; the first partition plate 2 is internally provided with two first pressure relief cavities 4, the two first pressure relief cavities 4 are arranged at intervals along the arrangement direction of the two containing spaces 9 (see the arrow b shown in the drawing), and each first pressure relief cavity 4 is used for relieving pressure for the battery cell 200 in the adjacent containing space 9. In these implementations, each first pressure relief cavity 4 is used for relieving pressure for the battery cell 200 in the adjacent containing space 9, so that the battery cell 200 in each containing space 9 can be relatively independently relieved pressure, and the battery cells 200 in the two containing spaces 9 are all relieved pressure to the first pressure relief cavity 4 located in the middle position, so that the path of pressure release 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 safety and stability of the battery pack 1000 as a whole.

[0049] In some embodiments, see Figure 8 , the first partition plate 2 comprises a first base plate 23, a second base plate 24 and a third base plate 25 arranged in sequence along the arrangement direction of the two containing spaces 9, the first base plate 23 and the second base plate 24 are arranged at intervals and form a first pressure relief cavity 4, and the second base plate 24 and the third base plate 25 are arranged at intervals and form another first pressure relief cavity 4; the second base plate 24 is made of a flame-retardant material. In these embodiments, the first base plate 23 and the second base plate 24 are arranged at intervals and form a first pressure relief cavity 4, and the second base plate 24 and the third base plate 25 are arranged at intervals and form another first pressure relief cavity 4. If the battery cell 200 in one containing space 9 occurs thermal runaway and generates flame, the flame-retardant second base plate 24 can prevent the flame from spreading to another containing space 9 through the first pressure relief cavity 4, thereby protecting the battery cell 200 in another containing space 9 and other components of the battery pack 1000, reducing the risk of fire and explosion of the battery pack 1000 as a whole. In addition, each first pressure relief cavity 4 is used for relieving pressure for the battery cell 200 in the adjacent containing space 9, that is, when the battery cell 200 is in thermal runaway, the high-temperature and high-pressure gas relatively impacts the second base plate 24, and the flame-retardant property of the second base plate 24 enables it to guarantee its structure to be complete to maintain the normal function of the two first pressure relief cavities 4 in the process of bearing the impact of the high-temperature and high-pressure gas. Since the second base plate 24 can effectively prevent the flame from spreading and remain stable under the impact of the high-temperature and high-pressure gas, the reliability of the entire battery pack 1000 is improved. In some embodiments, see Figure 3In these embodiments, the first side and / or the second side of the second substrate 24 is provided with the fire-retardant layer 8, which enhances the fire-retardant capability of the second substrate 24. If the flame approaches the second substrate 24 from the side of the first substrate 23, the fire-retardant layer 8 of the first side can directly contact the flame and suppress its spread. Likewise, if the flame approaches the second substrate 24 from the side of the third substrate 25, the fire-retardant layer 8 of the second side can also play a role in stopping the flame, thereby improving the reliability of stopping the flame from spreading to another accommodation space 9 through the first pressure relief cavity 4. It can be understood that the first side and the second side of the second substrate 24 are both provided with the fire-retardant layer 8 (as shown in Figure 3 FIG. 6), which can provide more comprehensive protection for the battery pack 1000. Specifically, an aluminum extrusion profile is provided in the structure as shown in Figure 4 FIG. 6, the aluminum extrusion profile includes the first partition plate 2 and the two side plates 14, the first partition plate 2 includes the first substrate 23, the second substrate 24 and the third substrate 25, the aluminum extrusion profile is processed to form the pressure relief hole 22 on the first substrate 23 and the third substrate 25, thereby forming the structure as shown in Figure 5 FIG. 6, then the isolation portion 7 and the fire-retardant layer 8 are provided, and the first end plate 11 and the second end plate 12 are installed, thereby forming the box 100 as shown in Figure 1 FIG. 6, for protection and sealing, the bottom plate 13 and the cover plate 15 are further installed, thereby forming the box 100 as shown in Figure 6 FIG. 6.

[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 box 100 and a battery cell 200, the structure of the box 100 of the battery pack 1000 is as described above, and the battery cell 200 is arranged in the accommodation cavity. Since the battery pack 1000 adopts all the technical solutions of 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 repeated here.

[0051] In some embodiments, see Figure 8The battery pack 1000 comprises a sealing part 300 surrounding the periphery of the explosion-proof valve of the battery cell 200, and the sealing part 300 is sealingly connected between the battery cell 200 and the first partition plate 2. In these embodiments, when the explosion-proof valve of the battery cell 200 is activated to release high-temperature and high-pressure gas, the gas will not spread to the environment around the thermal runaway battery cell 200 to affect or damage other battery cells 200. Due to the presence of the sealing part 300, the gas will be directly guided into the first pressure relief cavity 4 inside the first partition plate 2, which not only effectively limits the influence range of thermal runaway and avoids the spread of failure from one battery cell 200 to the entire battery pack, but also ensures that the gas enters the first pressure relief cavity 4 in an orderly manner, thereby better controlling the internal pressure and reducing potential safety hazards. In addition, the addition of the sealing part 300 also helps to fix the battery cell 200 and improve its stability. Specifically, the outer peripheral side of the battery cell 200 exceeds the corresponding isolation part 7, so that the end of the battery cell 200 provided with the explosion-proof valve has an excess part surrounding the periphery of the explosion-proof valve, and the sealing part 300 is connected between the excess part and the first partition plate 2. In these embodiments, the sealing part 300 is connected between the excess part and the first partition plate 2, which can avoid occupying the peripheral space of the battery cell 200, while ensuring independent thermal safety management of the battery cell 200, the multiple battery cells 200 in the accommodation space 9 can be more compact, and the space utilization rate is improved. Specifically, the sealing part 300 is a ring-shaped structure adhesive.

[0052] According to a third aspect of the present application, a power utilization device is provided, which comprises a battery pack 1000, and the structure of the battery pack 1000 is as described above. Since the power utilization device adopts all the technical solutions of 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 repeated here. The type of the power utilization device is not limited in the present application, and the power utilization device includes but is not limited to automobiles, ships, household appliances, and industrial equipment.

[0053] In the description of the present application, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0054] In the above-mentioned embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

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

[0056] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form, but any simple modification, equivalent change and modification made to the above embodiments without departing from the technical solution content of the present application and in accordance with the technical essence of the present application, are still within the scope of the technical solution of the present application.

Claims

1. A battery pack case characterized by comprising: The battery pack comprises: a housing provided with a receiving cavity for accommodating a battery cell; a first partition plate arranged in the receiving cavity, a first pressure relief cavity being formed in the first partition plate, the first partition plate being arranged opposite to an explosion-proof valve of the battery cell, and the first pressure relief cavity being used for pressure relief of the battery cell; a second partition plate arranged in the receiving cavity, a second pressure relief cavity being formed between the second partition plate and the housing, the second pressure relief cavity being in communication with the first pressure relief cavity, and the second pressure relief cavity intersecting with an extension direction of the first pressure relief cavity; and an exhaust valve penetrating the housing, the exhaust valve being in communication with the second pressure relief cavity and an outside of the housing.

2. The battery pack case of claim 1, wherein, The housing comprises a first end plate and a second end plate arranged opposite to each other, the second partition plate being arranged opposite to and spaced apart from the first end plate, and the second partition plate and the first end plate forming the second pressure relief cavity.

3. The battery pack case of claim 2, wherein, The housing further comprises 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 being arranged around a periphery of the bottom plate and forming the receiving cavity, the first partition plate being arranged opposite to and spaced apart from the bottom plate, and the first partition plate being connected with the second partition plate.

4. The battery pack case of claim 3, wherein, The first pressure relief cavity extends along a length direction of the first partition plate. The first partition plate is provided with a first opening facing the second partition plate, the second partition plate is provided with a second opening in communication with the first opening, and at least part of the second opening faces the exhaust valve.

5. The battery pack case of claim 2, wherein, The exhaust valve penetrates the first end plate and is arranged at a middle portion of the first end plate.

6. The battery pack case according to any one of claims 1 to 5, wherein The first partition plate is provided with a pressure relief hole in communication with the first pressure relief cavity, the battery pack further comprises an isolation portion covering the pressure relief hole, the isolation portion being arranged corresponding to the explosion-proof valve of the battery cell and being capable of being separated from or broken from the first partition plate to expose the pressure relief hole.

7. The battery pack case according to any one of claims 1 to 5, wherein The first partition plate divides the receiving cavity into two receiving spaces, each of the receiving spaces being used for accommodating a battery cell. The first partition plate is provided with two first pressure relief cavities, the two first pressure relief cavities being arranged spaced apart along an arrangement direction of the two receiving spaces, and each of the first pressure relief cavities being used for pressure relief of a battery cell in an adjacent receiving space.

8. The battery pack case of claim 7, wherein, The first partition plate comprises a first base plate, a second base plate and a third base plate arranged in sequence along the arrangement direction of the two receiving spaces, the first base plate and the second base plate being arranged spaced apart and forming a first pressure relief cavity, and the second base plate and the third base plate being arranged spaced apart and forming another first pressure relief cavity. The second base plate is made of a fire-retardant material, or the second base plate comprises a first side facing the first base plate and a second side facing the third base plate, at least one of the first side and the second side being provided with a fire-retardant layer.

9. A battery pack, characterized by, The battery pack comprises: the housing of the battery pack according to any one of claims 1-8, and a battery cell arranged in the receiving cavity.

10. The battery pack of claim 9, wherein, The battery pack comprises a sealing portion surrounding a periphery of the explosion-proof valve of the battery cell, the sealing portion being sealingly connected between the battery cell and the first partition plate.

Images