Battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack and electric equipment. The battery pack box body is provided with an accommodating space; the partition plate divides the containing space into a first cavity and a second cavity, the partition plate is provided with a first through hole, and the first through hole penetrates through the partition plate in the first direction; the single battery is arranged in the first cavity and comprises a first wall and a pressure relief mechanism, the pressure relief mechanism is arranged on the first wall, and the first wall and the pressure relief mechanism both face the partition plate; the protection piece body is arranged in the first through hole and defines a second through hole, the peripheral face of the protection piece body is separated from the hole wall of the first through hole, one end of the second through hole is opposite to the pressure relief mechanism, the other end of the second through hole is communicated with the second cavity, and the first turned edge and the second turned edge are arranged at the two ends of the protection piece body respectively. At least part of the orthographic projection of the first flange on the first wall is overlapped with the orthographic projection of the partition plate on the first wall, and at least part of the orthographic projection of the second flange on the first wall is overlapped with the orthographic projection of the partition plate on the first wall.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and electrical device. Background Technology

[0002] A battery pack typically consists of multiple battery cells, each equipped with an explosion-proof valve. When a battery cell experiences thermal runaway, the explosion-proof valve will burst open, releasing ejected material (such as high-temperature, high-pressure gas or molten material). If this ejected material continues to flow between other battery cells, its high-temperature, high-pressure characteristics can affect the stability of other battery cells, and in severe cases, even cause thermal propagation safety issues.

[0003] To address this issue, related technologies incorporate venting channels within the battery casing. These channels are separated from the individual battery cells by partitions. The venting channels effectively disperse ejected contaminants, reducing the negative impact of high temperature and pressure on other cells. Metal partitions are widely used due to their relatively good mechanical and thermal conductivity. However, the high-temperature, high-pressure gases emitted during thermal runaway in a battery cell are conductive. When these gases come into contact with the metal partitions, they can conduct electricity, causing a short circuit. Utility Model Content

[0004] This application provides a battery pack and electrical device that reduces the probability of short circuits caused by the conductive connection between high-temperature and high-pressure materials and separators when a battery cell experiences thermal runaway.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, embodiments of this application provide a battery pack, the battery pack having a first direction, the battery pack including a housing, a partition plate, battery cells, and a protective component, the housing having an accommodating space; the partition plate is disposed in the accommodating space and divides the accommodating space into a first chamber and a second chamber, the partition plate having a first through hole, the first through hole penetrating the partition plate along the first direction; the battery cells are disposed in the first chamber, the battery cells including a first wall and a pressure relief mechanism, the pressure relief mechanism being disposed in the first wall, the first wall and the pressure relief mechanism both facing the partition plate; the protective component includes a protective component body, a first flange and a second flange, the protective component body being disposed within the first through hole and surrounding the partition plate. The second through hole is spaced apart from the wall of the first through hole on the outer peripheral surface of the protective component body. Along the first direction, one end of the second through hole is opposite to the pressure relief mechanism, and the other end of the second through hole is connected to the second chamber. Along the first direction, the first flange and the second flange are respectively disposed at both ends of the protective component body. At least a portion of the orthographic projection of the first flange onto the first wall overlaps with the orthographic projection of the partition plate onto the first wall. At least a portion of the orthographic projection of the second flange onto the first wall overlaps with the orthographic projection of the partition plate onto the first wall. The first flange and the second flange sandwich the partition plate. The first direction is parallel to the thickness direction of the partition plate.

[0007] The battery pack proposed in this application has a partition plate that divides the housing into a first chamber for placing individual battery cells and a second chamber for venting. The pressure relief mechanism of each battery cell faces the partition plate and is opposite to the first through hole. The protective body of the protective component is disposed within the first through hole and surrounds the second through hole within the first through hole. The outer peripheral surface of the protective component is spaced apart from the hole wall of the first through hole to form an insulating distance, reducing the contact between the high-temperature and high-pressure material ejected from the thermal runaway battery cell and the hole wall of the first through hole. Along a first direction, a first flange and a second flange are respectively disposed on both sides of the protective component body, and at least a portion of the orthographic projection of the first flange onto the first wall overlaps with the orthographic projection of the partition plate onto the first wall, and at least a portion of the orthographic projection of the second flange onto the first wall overlaps with the orthographic projection of the partition plate onto the first wall. This allows the protective component to be more firmly fixed to the partition plate, and at the same time, the protective component can completely cover the first through hole, reducing the probability of short circuit caused by conductive connection between the high-temperature and high-pressure material and the hole wall of the first through hole, and reducing the probability of the first through hole being corroded by the high-temperature and high-pressure material ejected from the thermal runaway battery cell.

[0008] When a battery cell experiences thermal runaway and ejects high-temperature, high-pressure substances, these substances are discharged into the second chamber through a second through-hole. The protective component reduces the conductive connection between the high-temperature, high-pressure gas and the separator, thereby lowering the probability of a short circuit and, consequently, the likelihood of more severe thermal runaway. The high-temperature, high-pressure substances discharged into the second chamber have a separation space from other battery cells, preventing them from affecting other normal battery cells. This reduces the impact of the high-temperature, high-pressure substances ejected from the thermally runaway battery cell on the battery cells, and also reduces the likelihood of passively triggering thermal runaway in the battery cells, thus reducing the probability of thermal propagation.

[0009] Optionally, along the first direction, the partition plate has a first side facing the first wall and a second side away from the first wall; the first flange is disposed at one end of the protective body near the first wall, and the second flange is disposed at one end of the protective body away from the first wall. Along the first direction, at least a portion of the orthographic projection of the first flange onto the first wall overlaps with the orthographic projection of the first side onto the first wall, and at least a portion of the orthographic projection of the second flange onto the first wall overlaps with the orthographic projection of the second side onto the first wall.

[0010] Along the first direction, the first flange is located on one side of the first side, and at least a portion of the orthographic projection of the first flange onto the first wall overlaps with the orthographic projection of the first side onto the first wall; the second flange is located on one side of the second side, and at least a portion of the orthographic projection of the second flange onto the first wall overlaps with the orthographic projection of the second side onto the first wall, so that the protective member can be more firmly fixed to the partition plate, and the protective member can completely cover the first through hole, thereby reducing the probability of the first through hole being corroded by the high-temperature and high-pressure substances ejected from the thermal runaway battery cell.

[0011] Optionally, the separator is a conductive component, and the protective component is an insulating component. Along the first direction, the first flange contacts the first side surface, and the second flange contacts the second side surface. The first flange and the second flange are located on opposite sides of the protective component body along the first direction and extend away from the protective component body. The first flange abuts against the first side surface, and the second flange abuts against the second side surface, so that the protective component can cover the first through hole, reducing the corrosion of the first through hole by the high-temperature and high-pressure substances ejected from the thermal runaway battery cell. Furthermore, the protective component can protect the separator, reducing the contact between the separator and the high-temperature and high-pressure substances ejected from the battery cell, thereby reducing the probability of a short circuit caused by the conductive connection between the high-temperature and high-pressure substances and the separator, and thus reducing the risk of more severe thermal runaway.

[0012] Optionally, both the separator and the protective component are conductive, with the first flange spaced apart from the first side surface and the second flange spaced apart from the second side surface. If both the protective component and the separator are conductive, the first flange needs to be spaced apart from the first side surface to form an insulating distance, the second flange needs to be spaced apart from the second side surface to form an insulating distance, and the protective component body needs to be spaced apart from the wall of the first through hole to form an insulating distance. When a battery cell experiences thermal runaway, the protective component can protect the first through hole, reducing the contact between the high-temperature, high-pressure material ejected from the battery cell and the separator, thereby reducing the risk of short circuit.

[0013] Optionally, a first insulating member is provided between the first flange and the first side surface, and a second insulating member is provided between the second flange and the second side surface. The first flange and the first side surface are insulated by the first insulating member, and the second flange and the second side surface are insulated by the second insulating member. The protective member body is insulated by forming an insulating distance from the wall of the first through hole. When a battery cell experiences thermal runaway, the protective member can protect the first through hole, reduce the contact between the high-temperature and high-pressure substances ejected from the battery cell and the separator, thereby reducing the risk of short circuit.

[0014] Optionally, the first flange abuts against the first wall, or a third insulating element is sandwiched between the first flange and the first wall. The third insulating element between the first flange and the first wall reduces contact between the first flange and the high-temperature, high-pressure material ejected from the battery cell, thereby reducing damage to the first flange from the high-temperature, high-pressure material, and further reducing contact between the high-temperature, high-pressure material and the separator, thus reducing the risk of short circuits.

[0015] Optionally, a fourth insulating element is provided between the protective component body and the wall of the first through hole. The fourth insulating element provides insulation between the protective component body and the first through hole, reducing the contact between the high-temperature, high-pressure material ejected from the thermal runaway battery cell and the wall of the first through hole, thereby reducing the risk of short circuits.

[0016] Optionally, the second through-hole has a first inlet facing the first chamber and a first outlet facing the second chamber, and the diameter of the second through-hole decreases from the first inlet to the first outlet. The reduced diameter of the second through-hole allows it to guide the discharge of high-temperature, high-pressure substances when a battery cell experiences thermal runaway and breaks through the pressure relief mechanism, thus allowing the substances to exit into the second chamber. This reduces the impact of the high-temperature, high-pressure substances on other battery cells and also reduces contact between the substances and the separator, thereby reducing the risk of short circuits.

[0017] Optionally, the battery pack includes multiple battery cell groups arranged along a second direction, and each battery cell group includes multiple battery cells arranged along a third direction. The first direction, the second direction, and the third direction intersect each other. There are multiple first through holes and multiple protective members. Each protective member body is disposed in a corresponding first through hole. Along the first direction, the pressure relief mechanism of each battery cell is disposed opposite to the second through hole of the corresponding protective member.

[0018] The battery pack comprises multiple battery cell groups arranged along a second direction, and each battery cell group comprises multiple battery cells arranged along a third direction. Each battery cell corresponds to a first through-hole, each first through-hole corresponds to a protective component, and each protective component surrounds a second through-hole within its corresponding first through-hole. The pressure relief mechanism of each battery cell is opposite to the second through-hole of its corresponding protective component. When a battery cell experiences thermal runaway, the high-temperature, high-pressure material breaks through the pressure relief mechanism and flows through the second through-hole into the second chamber, reducing the contact between the high-temperature, high-pressure gas and other battery cells, thereby reducing the impact of the high-temperature, high-pressure gas on other battery cells and thus lowering the probability of more severe thermal runaway.

[0019] Optionally, along the first direction, an adhesive layer is provided between the first wall and the separator. The adhesive layer between the first wall of the battery cell and the separator enhances the connection strength between the battery cell and the separator, and improves the stability of the battery cell's fixation. Simultaneously, the adhesive layer also seals the connection between the battery cell and the separator, preventing high-temperature, high-pressure substances ejected from the thermally runaway battery cell from escaping through the connection between the separator and the protective component into the battery area, thus affecting other battery cells.

[0020] Optionally, the partition plate is provided with a liquid cooling channel for coolant to pass through. When the partition plate has a liquid cooling channel and the liquid cooling channel contains coolant, the coolant flowing in the liquid cooling plate can cool the battery cells and also cool the ejected material entering the second chamber. This can effectively control the temperature of the high-temperature and high-pressure material ejected from the thermally runaway battery cells, thereby reducing the impact on other battery cells due to excessive temperature.

[0021] Optionally, both the first flange and the second flange are constructed as annular structures surrounding the second through hole, and along the first direction, the orthographic projection of the first flange onto the first wall falls within the orthographic projection of the second flange onto the first wall.

[0022] Along the first direction, the orthographic projection of the first flange onto the first wall lies within the orthographic projection of the second flange onto the first wall, indicating that the size of the second flange is larger than that of the first flange. When a battery cell experiences thermal runaway, high-temperature, high-pressure material breaks through the pressure relief mechanism and enters the second chamber through the second through-hole. The second flange can reduce the contact between the high-temperature, high-pressure material entering the second chamber and the separator plate, thereby reducing the probability of a short circuit caused by the conductive connection between the high-temperature, high-pressure material and the separator plate. Since a large amount of high-temperature, high-pressure material is located in the second chamber, the insulation performance of the second flange needs to be greater than that of the first flange. Therefore, in this application, along the first direction, the orthographic projection of the first flange onto the first wall lies within the orthographic projection of the second flange onto the first wall, indicating that the size of the second flange is larger than that of the first flange. Thus, the second flange can reduce the contact between the high-temperature, high-pressure material entering the second chamber and the separator plate, thereby reducing the probability of a short circuit caused by the conductive connection between the high-temperature, high-pressure material and the separator plate.

[0023] This application also provides an electrical device including the battery pack described in any of the above embodiments. When a battery cell experiences thermal runaway and ejects high-temperature, high-pressure substances, the high-temperature, high-pressure substances are discharged into the second chamber through the second through hole. The protective component can reduce the conductive connection between the high-temperature, high-pressure gas and the separator plate, thereby reducing the probability of a short circuit and further reducing the probability of more severe thermal runaway. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the exploded structure of the battery pack in this application;

[0026] Figure 2 This is a cross-sectional view of a battery pack in one embodiment of this application;

[0027] Figure 3 for Figure 2 Enlarged view of region D in the middle;

[0028] Figure 4 This is a schematic diagram of the structure of the protective component in this application;

[0029] Figure 5 This is a schematic diagram of the structure of a single battery cell in this application;

[0030] Figure 6 This is a cross-sectional view of the battery pack in another embodiment of this application;

[0031] Figure 7 for Figure 6 Enlarged view of region E in the middle;

[0032] Figure 8 This is a cross-sectional view of the battery pack in yet another embodiment of this application;

[0033] Figure 9 for Figure 8 A magnified view of region F in the middle.

[0034] [Explanation of Labels in the Attached Image]

[0035] 1: Box body; 10: Storage space; 101: First chamber; 102: Second chamber;

[0036] 2: Partition plate; 20: First through hole; 21: First side surface; 22: Second side surface;

[0037] 3: Battery cell assembly; 31: Battery cell; 311: First wall; 312: Pressure relief mechanism;

[0038] 4: Protective component; 40: Second through hole; 41: Protective component body; 411: Outer peripheral surface; 42: First flange; 43: Second flange; 44: First inlet; 45: First outlet;

[0039] 5: First insulating component; 6: Second insulating component; 7: Adhesive layer; 8: Third insulating component; 9: Fourth insulating component;

[0040] A: First direction; B: Second direction; C: Third direction. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0043] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0047] In related technologies, an exhaust channel is provided inside the battery casing 1. The exhaust channel is separated from the area where the battery cell 31 is located by a partition plate 2. The exhaust channel can disperse the ejected material and reduce the negative impact of high temperature and high pressure on other battery cells. The metal partition plate 2 has a wide range of applications due to its relatively good mechanical and thermal conductivity. Since the high temperature and high pressure gas emitted when the battery cell 31 experiences thermal runaway is conductive, it will conduct electricity when it comes into contact with the metal partition plate 2, causing a short circuit. Therefore, an insulating layer is covered in the through holes of the partition plate 2. When the battery cell 31 experiences thermal runaway, the high temperature and high pressure material ejected by the pressure relief mechanism 312 will destroy the insulating layer, allowing the high temperature and high pressure gas to come into contact with the metal partition plate 2, still posing a short circuit risk.

[0048] In view of this, refer to Figures 1 to 7This application provides a battery pack having a first direction A. The battery pack includes a housing 1, a partition 2, battery cells 31, and a protective member 4. The housing 1 has a receiving space 10. The partition 2 is disposed in the receiving space 10 and divides the receiving space 10 into a first chamber 101 and a second chamber 102. The partition 2 has a first through hole 20 that passes through the partition 2 along the first direction A. The battery cells 31 are disposed in the first chamber 101 and include a first wall 311 and a pressure relief mechanism 312. The pressure relief mechanism 312 is disposed in the first wall 311, and both the first wall 311 and the pressure relief mechanism 312 face the partition 2. The protective member 4 includes a protective member body 41, a first flange 42, and a second flange 43. The protective body 41 is disposed within the first through hole 20 and surrounds the second through hole 40. The outer peripheral surface 411 of the protective body 41 is spaced apart from the hole wall of the first through hole 20. Along the first direction A, one end of the second through hole 40 is opposite to the pressure relief mechanism 312, and the other end of the second through hole 40 is connected to the second chamber 102. Along the first direction A, the first flange 42 and the second flange 43 are respectively disposed at both ends of the protective body 41. At least a portion of the orthographic projection of the first flange 42 onto the first wall 311 overlaps with the orthographic projection of the partition plate 2 onto the first wall 311. At least a portion of the orthographic projection of the second flange 43 onto the first wall 311 overlaps with the orthographic projection of the partition plate 2 onto the first wall 311. The first direction A is parallel to the thickness direction of the partition plate 2.

[0049] The battery pack in this application has a partition plate 2 that divides the housing 1 into a first chamber 101 for placing battery cells 31 and a second chamber 102 for venting. The pressure relief mechanism 312 of the battery cell 31 faces the partition plate 2 and is opposite to the first through hole 20. The protective body 41 of the protective member 4 is disposed in the first through hole 20 and surrounds the second through hole 40 within the first through hole 20. The outer peripheral surface of the protective body 41 is spaced apart from the hole wall of the first through hole 20 to form an insulating distance, reducing the contact between the high-temperature and high-pressure substances ejected from the thermally runaway battery cell and the hole wall of the first through hole 20, thereby reducing the risk of short circuit. Along the first direction A, the first flange 42 and the second flange 43 are respectively provided on both sides of the protective member body 41. At least part of the orthographic projection of the first flange 42 on the first wall 311 overlaps with the orthographic projection of the partition plate 2 on the first wall 311, and at least part of the orthographic projection of the second flange 43 on the first wall 311 overlaps with the orthographic projection of the partition plate 2 on the first wall 311. This allows the protective member 4 to be more firmly fixed on the partition plate 2. At the same time, the protective member 4 can completely cover the first through hole 20, thereby reducing the probability of the first through hole 20 being corroded by the high-temperature and high-pressure substances ejected from the thermal runaway battery cell 31.

[0050] When a battery cell 31 experiences thermal runaway and ejects high-temperature, high-pressure material, this material is discharged into the second chamber 102 through the second through-hole 40. The protective component 4 reduces the conductive connection between the high-temperature, high-pressure gas and the separator 2, thereby reducing the probability of a short circuit and, consequently, the probability of more severe thermal runaway. The high-temperature, high-pressure material flowing into the second chamber 102 has an evacuation space separated from other battery cells 31, thus preventing it from affecting other normal battery cells 31. This reduces the impact of the high-temperature, high-pressure material ejected from the thermally runaway battery cell 31 on the battery cell 31, and also reduces the passive triggering of thermal runaway by the battery cell 31, thereby reducing the probability of thermal propagation.

[0051] refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 The outer peripheral surface 411 of the protective component body 41 is spaced apart from the hole wall of the first through hole 20. This separation creates an insulating distance. It reduces the contact between the high-temperature, high-pressure material ejected from the thermal runaway battery cell 31 and the hole wall of the first through hole 20, thus lowering the probability of a short circuit caused by conductive connection between the high-temperature, high-pressure material and the hole wall of the first through hole 20.

[0052] It should be understood that the protective body 41 is at least partially located within the first through hole 20, and along the first direction A, the height of the protective body 41 is greater than or equal to the height of the first through hole 20.

[0053] The protective body 41 forms the second through hole 20, and the first flange 42, the second flange 43, and the outer wall of the second through hole 20 are constructed into a U-shaped structure.

[0054] Optionally, along the first direction A, the partition plate 2 has a first side 21 facing the first wall 311 and a second side 22 away from the first wall 311; a first flange 42 is disposed at one end of the protective body 41 near the first wall 311, and a second flange 43 is disposed at one end of the protective body 41 away from the first wall 311. Along the first direction A, at least a portion of the orthographic projection of the first flange 42 onto the first wall 311 overlaps with the orthographic projection of the first side 21 onto the first wall 311, and at least a portion of the orthographic projection of the second flange 43 onto the first wall 311 overlaps with the orthographic projection of the second side 22 onto the first wall 311. Along the first direction A, the first flange 42 is located on one side of the first side 21, and at least a portion of the orthographic projection of the first flange 42 onto the first wall 311 overlaps with the orthographic projection of the first side 21 onto the first wall 311; the second flange 43 is located on one side of the second side 22, and at least a portion of the orthographic projection of the second flange 43 onto the first wall 311 overlaps with the orthographic projection of the second side 22 onto the first wall 311, so that the protective member 4 can be more firmly fixed on the partition plate 2, and at the same time, the protective member 4 can completely cover the first through hole 20, thereby reducing the probability of the first through hole 20 being corroded by the high-temperature and high-pressure substances ejected from the thermal runaway battery cell 31.

[0055] Optionally, see reference 6 and Figure 7 The separator 2 is a conductive component, and the protective component 4 is an insulating component. Along the first direction A, the first flange 42 contacts the first side surface 21, and the second flange 43 contacts the second side surface 22. Specifically, the first flange 42 and the second flange 43 are located on opposite sides of the protective component body 41 along the first direction A and extend away from the protective component body 41. The first flange 42 abuts against the first side surface 21, and the second flange 43 abuts against the second side surface 22, so that the protective component 4 can cover the first through hole 20, reducing the corrosion of the first through hole 20 by the high-temperature and high-pressure substances ejected from the thermal runaway battery cell 31. Furthermore, the protective component 4 can protect the separator 2, reducing the contact between the separator 2 and the high-temperature and high-pressure substances ejected from the battery cell 31, thereby reducing the probability of short circuit caused by the conductive connection between the high-temperature and high-pressure substances and the separator 2, and thus reducing the risk of more serious thermal runaway.

[0056] Optionally, both the separator 2 and the protective element 4 are conductive. The first flange 42 is spaced apart from the first side surface 21, and the second flange 43 is spaced apart from the second side surface 22. If both the protective element 4 and the separator 2 are conductive, the first flange 42 needs to be spaced apart from the first side surface 21 to form an insulating distance, the second flange 43 needs to be spaced apart from the second side surface 22 to form an insulating distance, and the protective element body 41 needs to be spaced apart from the wall of the first through hole 20 to form an insulating distance. When the battery cell 31 experiences thermal runaway, the protective element 4 can protect the first through hole 20, reducing the contact between the high-temperature and high-pressure substances ejected from the battery cell 31 and the separator 2, thereby reducing the risk of short circuit.

[0057] Optionally, refer to Figure 3 and Figure 4 A first insulating member 5 is provided between the first flange 42 and the first side surface 21, and a second insulating member 6 is provided between the second flange 43 and the second side surface 22. The first flange 42 and the first side surface 21 are insulated by the first insulating member 5, and the second flange 43 and the second side surface 22 are insulated by the second insulating member 6. The protective member body 41 is insulated by forming an insulating distance from the hole wall of the first through hole 20. When the battery cell 31 experiences thermal runaway, the protective member 4 can protect the first through hole 20, reduce the contact between the high-temperature and high-pressure substances ejected from the battery cell 31 and the separator plate 2, thereby reducing the risk of short circuit.

[0058] Optionally, refer to Figure 8 and Figure 9 A third insulating element 8 is sandwiched between the first flange 42 and the first wall 311. The third insulating element 8 between the first flange 42 and the first wall 311 reduces the contact between the first flange 42 and the high-temperature and high-pressure material ejected from the battery cell 31, thereby reducing the damage to the first flange 42 caused by the high-temperature and high-pressure material, and further reducing the contact between the high-temperature and high-pressure material and the separator 2, thus reducing the risk of short circuit.

[0059] Optionally, refer to Figure 8 and Figure 9 A fourth insulating element 9 is provided between the protective component body 41 and the hole wall of the first through hole 20. The fourth insulating element 9 is provided between the protective component body 41 and the hole wall of the first through hole 20, which insulates the protective component body 41 from the first through hole 20, reduces the contact between the high temperature and high pressure material ejected from the thermal runaway battery cell 31 and the hole wall of the first through hole 20, thereby reducing the risk of short circuit.

[0060] Optionally, refer to Figure 4 The second through-hole 40 has a first inlet 44 facing the first chamber 11 and a first outlet 45 facing the second chamber 12. The diameter of the second through-hole 40 decreases from the first inlet 44 to the first outlet 45. This decrease in diameter allows the second through-hole 40 to guide the discharge of high-temperature, high-pressure substances when the battery cell 31 experiences thermal runaway and breaks through the pressure relief mechanism 312, thus reducing the impact of the high-temperature, high-pressure substances on other battery cells. It also reduces contact between the high-temperature, high-pressure substances and the separator, thereby reducing the risk of short circuits.

[0061] Optionally, refer to Figure 1The battery pack includes multiple battery cell groups 3, which are arranged along the second direction B. Each battery cell group 3 includes multiple battery cells 31 arranged along the third direction C. The first direction A, the second direction B and the third direction C intersect each other. There are multiple first through holes 20 and protective members 4. Each protective member body 41 is disposed in the corresponding first through hole 20. Along the first direction A, the pressure relief mechanism 312 of each battery cell 31 is disposed opposite to the second through hole 40 of the corresponding protective member 4.

[0062] Specifically, the battery pack includes multiple battery cell groups 3 arranged along the second direction B, and each battery cell group 3 includes multiple battery cells 31 arranged along the third direction C. Each battery cell 31 corresponds to a first through hole 20, each first through hole 20 corresponds to a protective member 4, and each protective member 4 surrounds a second through hole 40 in the corresponding first through hole 20. The pressure relief mechanism 312 of each battery cell 31 is opposite to the second through hole 40 of the corresponding protective member 4. When a battery cell 31 experiences thermal runaway, the high-temperature and high-pressure material breaks through the pressure relief mechanism 312 and flows through the second through hole 40 to the second chamber 102, reducing the contact between the high-temperature and high-pressure gas and other battery cells 31, thereby reducing the impact of the high-temperature and high-pressure gas on other battery cells 31 and thus reducing the probability of more serious thermal runaway.

[0063] In some embodiments, the battery cell 31 can be a secondary battery, which refers to a battery cell 31 that can be recharged to activate the active materials and continue to be used after the battery cell 31 has been discharged. The battery cell 31 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to these.

[0064] Optionally, refer to Figure 3 , Figure 4 , Figure 6 and Figure 7 Along the first direction A, an adhesive layer 7 is provided between the first wall 311 and the separator 2. Specifically, the adhesive layer 7 between the first wall 311 of the battery cell 31 and the separator 2 can improve the connection strength between the battery cell 31 and the separator 2 and improve the stability of the battery cell 31. At the same time, the adhesive layer 7 can also seal the connection between the battery cell 31 and the separator 2, preventing high-temperature and high-pressure substances ejected from the thermally runaway battery cell 31 from escaping into the battery area through the connection between the separator 2 and the protective component 4 and affecting other battery cells 31.

[0065] Optionally, the partition plate 2 is provided with a liquid cooling channel for coolant to pass through. When the partition plate 2 has a liquid cooling channel and coolant is present in the liquid cooling channel, the coolant flowing in the liquid cooling plate can cool the battery cell 31 and also cool the ejected material entering the second chamber 102. This can effectively control the temperature of the high-temperature and high-pressure material ejected from the thermally runaway battery cell 31, thereby reducing the impact of excessively high temperature on other battery cells 31 and reducing the possibility of excessively hot ejected material coming into contact with oxygen and causing open flame combustion, thus causing secondary damage.

[0066] It should be understood that the partition plate 2 can be made of metal and can be constructed as a liquid cooling plate, a partition, or a support component, etc. The partition plate 2 can also be made of other metal materials, such as insulating materials, etc., and this application is not limited to this.

[0067] Optionally, both the first flange 42 and the second flange 43 are constructed as annular structures surrounding the second through hole 40. Along the first direction A, the orthographic projection of the first flange 42 onto the first wall 311 falls within the orthographic projection of the second flange 43 onto the first wall 311. The fact that the orthographic projection of the first flange 42 onto the first wall 311 is located within the orthographic projection of the second flange 43 onto the first wall 311 along the first direction A indicates that the size of the second flange 43 is larger than the size of the first flange 42. When the battery cell 31 experiences thermal runaway, the high-temperature, high-pressure material breaks through the pressure relief mechanism 312 and enters the second chamber 102 through the second through hole 40.

[0068] Since a large amount of high-temperature and high-pressure material is in the second chamber 102, the insulation performance of the second flange 43 needs to be greater than that of the first flange 42. Therefore, in this application, along the first direction A, the orthographic projection of the first flange 42 onto the first wall 311 is located within the orthographic projection of the second flange 43 onto the first wall 311, indicating that the size of the second flange 43 is larger than that of the first flange 42. Thus, the second flange 43 can reduce the contact between the high-temperature and high-pressure material entering the second chamber 102 and the partition plate 2, thereby reducing the probability of short circuit caused by the conductive connection between the high-temperature and high-pressure material and the partition plate 2.

[0069] This application also provides an electrical device including the battery pack described in any of the above embodiments.

[0070] The battery pack in this application includes multiple battery cell groups 3 arranged along a second direction B, and each battery cell group 3 includes multiple battery cells 31 arranged along a third direction C. Each battery cell 31 corresponds to a first through hole 20, each first through hole 20 corresponds to a protective member 4, and each protective member 4 surrounds a second through hole 40 in the corresponding first through hole 20. The pressure relief mechanism 312 of each battery cell 31 is opposite to the second through hole 40 of the corresponding protective member 4. The first flange 42 is insulated from the first side surface 21 of the partition plate 2, the second flange 43 is insulated from the second side surface 22 of the partition plate 2, and there is an insulating distance between the protective member body 41 and the side wall of the first through hole 20. When the battery cell 31 experiences thermal runaway, the high-temperature and high-pressure material breaks through the pressure relief mechanism 312 and flows through the second through hole 40 to the second chamber 102. The protective member 4 can reduce the conductive connection between the high-temperature and high-pressure gas and the partition plate 2, thereby reducing the probability of short circuit and further reducing the probability of more serious thermal runaway.

[0071] The battery disclosed in this application can be used, but is not limited to, in vehicles, and can also be used in other electrical equipment with structural beams, wherein the battery is able to avoid the structural beams of other electrical equipment.

[0072] The battery disclosed in this application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft that have longitudinal beams and are designed to allow the battery to avoid obstructing these beams. The power system of such electrical equipment can be constructed using the battery disclosed in this application.

[0073] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, heavy trucks, buses, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0074] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0075] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle type can be a sedan, SUV, heavy truck, or bus, etc. A battery is installed inside the vehicle, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, it can serve as the vehicle's operating power source, powering the vehicle's electrical system, such as meeting the power needs for starting, navigation, and operation.

[0076] The vehicle may also include a controller and a motor, with the controller controlling the battery to power the motor, for example, for the vehicle's power needs during starting, navigation, and driving.

[0077] In some embodiments of this application, the battery can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0078] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0079] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0080] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

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

Claims

1. A battery pack having a first orientation (A), characterized in that, include: The box (1) has a storage space (10); A partition plate (2) is disposed in the accommodating space (10) and divides the accommodating space (10) into a first chamber (11) and a second chamber (12). The partition plate (2) has a first through hole (20) along the first direction (A). The first through hole (20) penetrates the partition plate (2). A battery cell (31) is disposed in the first chamber (11). The battery cell (31) includes a first wall (311) and a pressure relief mechanism (312). The pressure relief mechanism (312) is disposed on the first wall (311). Both the first wall (311) and the pressure relief mechanism (312) face the partition plate (2). The protective component (4) includes a protective component body (41), a first flange (42), and a second flange (43). The protective component body (41) is disposed within the first through hole (20) and surrounds the second through hole (40). The outer peripheral surface (411) of the protective component body (41) is spaced apart from the hole wall of the first through hole (20). Along the first direction (A), one end of the second through hole (40) is opposite to the pressure relief mechanism (312), and the other end of the second through hole (40) communicates with the second chamber (12). Along the first direction (A), the first flange (42) and the second flange (43) are separated from the second through hole (20). The second flange (43) is respectively disposed at both ends of the protective body (41). At least a portion of the orthographic projection of the first flange (42) onto the first wall (311) overlaps with the orthographic projection of the partition plate (2) onto the first wall (311). At least a portion of the orthographic projection of the second flange (43) onto the first wall (311) overlaps with the orthographic projection of the partition plate (2) onto the first wall (311). The first flange (42) and the second flange (43) sandwich the partition plate (2). The first direction (A) is parallel to the thickness direction of the partition plate (2).

2. The battery pack according to claim 1, characterized in that, Along the first direction (A), the partition plate (2) has a first side surface (21) facing the first wall (311) and a second side surface (22) away from the first wall (311); The first flange (42) is disposed at one end of the protective body (41) near the first wall (311), and the second flange (43) is disposed at one end of the protective body (41) away from the first wall (311). Along the first direction (A), at least a portion of the orthographic projection of the first flange (42) onto the first wall (311) overlaps with the orthographic projection of the first side surface (21) onto the first wall (311), and at least a portion of the orthographic projection of the second flange (43) onto the first wall (311) overlaps with the orthographic projection of the second side surface (22) onto the first wall (311).

3. The battery pack according to claim 2, characterized in that, The partition plate (2) is a conductive component, and the protective component (4) is an insulating component. Along the first direction (A), the first flange (42) contacts the first side surface (21), and the second flange (43) contacts the second side surface (22).

4. The battery pack according to claim 2, characterized in that, Both the partition plate (2) and the protective component (4) are conductive components. The first flange (42) is spaced apart from the first side surface (21), and the second flange (43) is spaced apart from the second side surface (22).

5. The battery pack according to claim 4, characterized in that, A first insulating member (5) is provided between the first flange (42) and the first side surface (21), and a second insulating member (6) is provided between the second flange (43) and the second side surface (22).

6. The battery pack according to claim 1, characterized in that, The first flange (42) abuts against the first wall (311), or a third insulating element (8) is sandwiched between the first flange (42) and the first wall (311).

7. The battery pack according to claim 1, characterized in that, A fourth insulating element (9) is provided between the protective body (41) and the hole wall of the first through hole (20).

8. The battery pack according to claim 1, characterized in that, The second through hole (40) has a first inlet (44) facing the first chamber (11) and a first outlet (45) facing the second chamber (12), and the diameter of the second through hole (40) decreases in the direction from the first inlet (44) to the first outlet (45).

9. The battery pack according to claim 1, characterized in that, The battery pack includes multiple battery cell groups (3), which are arranged along a second direction (B). Each battery cell group (3) includes multiple battery cells (31) arranged along a third direction (C). The first direction (A), the second direction (B), and the third direction (C) intersect each other. There are multiple first through holes (20) and protective components (4). Each protective component body (41) is disposed in the corresponding first through hole (20). Along the first direction (A), the pressure relief mechanism (312) of each battery cell (31) is disposed opposite to the second through hole (40) of the corresponding protective component (4).

10. The battery pack according to claim 1, characterized in that, Along the first direction (A), an adhesive layer (7) is provided between the first wall (311) and the partition plate (2).

11. The battery pack according to claim 1, characterized in that, The partition plate (2) is provided with a liquid cooling channel for the coolant to pass through.

12. The battery pack according to claim 1, characterized in that, Both the first flange (42) and the second flange (43) are constructed as annular structures surrounding the second through hole (40). Along the first direction (A), the orthographic projection of the first flange (42) onto the first wall (311) falls into the orthographic projection of the second flange (43) onto the first wall (311).

13. An electrical appliance, characterized in that, The battery pack includes any one of claims 1-12.

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