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. A box body in the battery pack defines an accommodating space; the partition plate is arranged in the containing space and 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 thickness direction of the partition plate; the single battery is arranged in the first cavity, the single battery comprises a first wall and a pressure relief mechanism, and the pressure relief mechanism is arranged opposite to the first through hole in the thickness direction of the partition plate; in the thickness direction of the partition plate, a part of the protection plate protrudes in the direction away from the battery monomers to form a main body part and a convex part, the main body part is arranged between the first wall and the partition plate, the convex part extends into the first through hole, and the convex part is at least partially separated from the inner peripheral wall of the first through hole; the lug boss is provided with a weak part, and the weak part is configured to be damaged by a high-temperature and high-pressure substance after the pressure relief mechanism flushes the valve, so that the internal space of the battery monomer is communicated with the second cavity.

Description

Technical Field

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

[0002] A battery pack usually includes multiple battery cells, each of which is equipped with an explosion-proof valve. When a battery cell experiences thermal runaway, the explosion-proof valve will burst open, and ejecta (such as high-temperature and high-pressure gas, molten material, etc.) will erupt. If the ejecta still flows between other battery cells, its high-temperature and high-pressure characteristics will affect the stability of other battery cells, and even cause serious safety problems such as heat spread.

[0003] Existing exhaust channels are separated from the battery cell area, allowing for the evacuation of ejected material and mitigating the negative impact of high temperature and high pressure on other cells. However, the high-temperature gases emitted during a runaway battery cell can carry electrolyte. Contact between the electrolyte and the inner wall of the liquid cooling plate channel creates a risk of electrical conductivity, preventing the battery pack from meeting insulation requirements after thermal runaway, posing a safety hazard. Utility Model Content

[0004] The present application provides a battery pack and electrical equipment, which solve the technical problem that thermal runaway of one battery cell affects other battery cells, thereby achieving the technical effect of protecting the battery cells.

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

[0006] In a first aspect, an embodiment of the present application provides a battery pack, comprising a box body, a partition plate, a battery cell and a protective plate, wherein the box body defines a storage space; the partition plate is arranged in the storage space and divides the storage space into a first chamber and a second chamber, the partition plate has a first through hole, and the first through hole passes through the partition plate along the thickness direction of the partition plate; the battery cell is arranged in the first chamber, the battery cell comprises a first wall and a pressure relief mechanism, the pressure relief mechanism is arranged in the first wall, the first wall and the pressure relief mechanism are both facing the partition plate, and the pressure relief mechanism is The pressure relief mechanism is arranged opposite to the first through hole; along the thickness direction of the partition plate, the protective plate includes a main body and a raised portion, the main body is arranged between the first wall and the partition plate, the raised portion extends into the first through hole, and the raised portion is at least partially spaced apart from the inner peripheral wall of the first through hole, wherein the raised portion is provided with a weak portion, and along the thickness direction of the partition plate, the projection of the pressure relief mechanism and the projection of the weak portion at least partially overlap, and the weak portion is constructed to be destroyed by high-temperature and high-pressure material after the pressure relief mechanism punches the valve, so as to connect the internal space of the battery cell with the second chamber.

[0007] In the battery pack proposed in the embodiment of the present application, the battery cells are arranged in the first chamber, and a pressure relief mechanism is provided on the first wall of the battery cells facing the partition plate, and the pressure relief mechanism is arranged opposite to the first through hole provided on the partition plate. A weak portion is provided on the raised portion. When a battery cell experiences thermal runaway and erupts after the pressure relief mechanism flushes the valve, the ejected high-temperature and high-pressure material can more easily break through the weak portion, destroying the raised portion. The erupted material enters the second chamber and spreads within the second chamber. When the erupted material touches the bottom of the exhaust channel and rebounds, the raised portion corresponding to the battery cell that has not experienced thermal runaway can protect the battery cell and the pressure relief mechanism, reducing the damage caused by the erupted material to the battery cell that has not experienced thermal runaway and the pressure relief mechanism.

[0008] Along the thickness of the partition plate, the projection of the pressure relief mechanism at least partially overlaps with the projection of the weak portion. When a battery cell experiences thermal runaway and erupts after the pressure relief mechanism ruptures, the ejected high-pressure fluid can directly impact the weak portion. This means that the impact force can directly act on the weak portion, making it easier for the high-pressure fluid to break through the weak portion.

[0009] In addition, the protrusion extends into the first through hole, and the protrusion is at least partially separated from the inner peripheral wall of the first through hole, that is, there is a distance between at least part of the protrusion and the first through hole, which facilitates the entry of the protective plate into the first through hole during assembly, and the distance between the protrusion and the first through hole forms an air interlayer. When the battery cell thermally runs away, the air interlayer has the effect of heat insulation and heat preservation, reduces the damage to the partition plate due to high temperature, and improves the safety performance of the battery pack.

[0010] Optionally, the raised portion includes a bottom wall and a peripheral wall, wherein the peripheral wall connects the outer periphery of the bottom wall to the main body. The bottom wall and peripheral wall of the raised portion extend into the first through hole. When a battery cell experiences thermal runaway and erupts after the pressure relief mechanism flushes the valve, the ejected high-temperature, high-pressure material impacts the bottom wall and peripheral wall, destroying the raised portion. The ejected material enters the second chamber and spreads within the second chamber. This protects the battery cell and reduces damage to remaining battery cells that have not experienced thermal runaway from the ejected material in the second chamber.

[0011] Optionally, along the circumference of the first through hole, the circumferential wall includes a first side wall, a second side wall, a third side wall and a fourth side wall connected in sequence; along the first direction, the first side wall is opposite to the third side wall, and along the second direction, the second side wall is opposite to the fourth side wall, and the first direction, the second direction and the thickness direction of the partition plate intersect each other.

[0012] Optionally, along the thickness direction of the partition plate, the distance between the first side wall and the third side wall is the same, and the distance between the second side wall and the fourth side wall is the same.

[0013] Optionally, along the thickness direction of the partition plate and in a direction away from the battery cell, the distance between the first side wall and the third side wall gradually decreases, and / or the distance between the second side wall and the fourth side wall gradually decreases.

[0014] Optionally, the weak portion is provided on the bottom wall. When a battery cell experiences thermal runaway and erupts after the pressure relief mechanism flushes the valve, the ejected high-pressure ejecta directly faces the bottom wall of the raised portion. The weak portion is provided on the bottom wall, so that the high-pressure ejecta can better penetrate the weak portion.

[0015] Optionally, the weakened portion is provided at the junction of the bottom wall and the peripheral wall. When a battery cell experiences thermal runaway and erupts after the pressure relief mechanism flushes the valve, the ejected high-pressure ejecta directly faces the bottom wall of the raised portion. The weakened portion is provided at the junction of the bottom wall and the peripheral wall. The force of the high-pressure ejecta impacting the bottom wall is transmitted to the junction of the bottom wall and the peripheral wall, making it easier for the high-pressure ejecta to break through the weakened portion.

[0016] Optionally, the raised portion includes a first portion, a middle portion and a second portion. Along the first direction, the first portion is connected between one end of the middle portion and the main body portion, and the second portion is connected between the other end of the middle portion and the main body portion. Along the second direction, both ends of the middle portion are connected to the main body portion. The first direction, the second direction and the thickness direction of the partition plate intersect with each other.

[0017] Optionally, along the first direction, a cross section of the inner side surface of the middle portion is an arc that bulges away from the battery cell.

[0018] Optionally, along the second direction, the middle portion includes a first middle wall and a second middle wall connected at an angle, with one end of the first middle wall connected to the main body, one end of the second middle wall connected to the main body, and the other end of the first middle wall connected to the other end of the second middle wall. Along the first direction, the middle portion has a V-shaped cross-section. When a battery cell experiences thermal runaway and erupts after the pressure relief mechanism flushes the valve, the ejected high-pressure ejecta faces the V-shaped structure of the middle portion, making it easier for the high-pressure ejecta to penetrate the weak portion.

[0019] Optionally, the weak portion is provided at the junction of the first intermediate wall and the second intermediate wall. When a battery cell experiences thermal runaway and erupts after the pressure relief mechanism actuates the valve, the ejected high-pressure fluid directly faces the bottom of the V-shaped structure of the intermediate portion, making it easier for the high-pressure fluid to penetrate the weak portion.

[0020] Optionally, along the thickness direction of the partition plate, the projection of the pressure relief mechanism falls within the projection of the weak portion. When the battery cell experiences thermal runaway, the ejected material from the pressure relief mechanism can be directed directly toward the protrusion. The force of the ejected material is concentrated within the projection of the weak portion, making it easier to destroy the weak portion, thereby allowing the ejected material to be smoothly discharged into the second chamber.

[0021] Optionally, the maximum distance between the end of the protrusion away from the first wall and the first wall is H1, and the distance between the end of the first through hole away from the first wall and the first wall is H2, satisfying the following: H1 ≥ H2. In the event of thermal runaway of the battery cell, since the end of the protrusion away from the first wall is lower than the end of the first through hole away from the first wall, the high-temperature conductive material released through the protrusion is lower than the first through hole after being discharged, thus preventing the high-temperature conductive material from flowing back into the first through hole, thereby improving the protection effect.

[0022] In a second aspect, an embodiment of the present application provides an electrical device comprising the battery pack described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 This is a schematic diagram of the explosion structure of the battery pack of this application;

[0025] Figure 2 A schematic diagram of the partial structure of the battery pack of this application;

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of the battery pack of this application;

[0027] Figure 4 for Figure 3 A partial enlarged view of the middle D area;

[0028] Figure 5 This is a schematic diagram of the structure of the battery cell of this application;

[0029] Figure 6 This is a schematic structural diagram of a protective plate in one embodiment of the present application;

[0030] Figure 7 This is a schematic structural diagram of a protective plate in one embodiment of the present application;

[0031] Figure 8This is a schematic structural diagram of a protective plate in one embodiment of the present application;

[0032] Figure 9 This is a schematic structural diagram of a protective plate in one embodiment of the present application;

[0033] Figure 10 This is a schematic structural diagram of a protective plate in one embodiment of the present application;

[0034] Figure 11 This is a schematic diagram of the cross-sectional structure of a protective plate in one embodiment of the present application;

[0035] Figure 12 This is a schematic diagram of the cross-sectional structure of a protective plate in one embodiment of the present application;

[0036] Figure 13 for Figure 12 A partial enlarged view of the middle E area;

[0037] Figure 14 This is a schematic diagram of the cross-sectional structure of a protective plate in one embodiment of the present application;

[0038] Figure 15 for Figure 14 A partial enlarged view of the middle F area;

[0039] Figure 16 This is a schematic diagram of the cross-sectional structure of a protective plate in one embodiment of the present application;

[0040] Figure 17 This is a schematic diagram of the cross-sectional structure of a protective plate in one embodiment of the present application;

[0041] Figure 18 This is a schematic diagram of the cross-sectional structure of a protective plate in one embodiment of the present application;

[0042] Figure 19 This is a schematic diagram of the cross-sectional structure of a protective plate in one embodiment of the present application;

[0043] Figure 20 This is a schematic diagram of the cross-sectional structure of a protective plate in one embodiment of the present application;

[0044] Figure 21 This is a schematic structural diagram of a protective plate in one embodiment of the present application;

[0045] Figure 22 for Figure 21 Schematic diagram of the cross-sectional structure of the middle protection plate;

[0046] Figure 23 This is a schematic structural diagram of a protective plate in one embodiment of the present application;

[0047] Figure 24 for Figure 23Schematic diagram of the cross-sectional structure of the middle protection plate;

[0048] Figure 25 This is a schematic structural diagram of a protective plate in one embodiment of the present application;

[0049] Figure 26 for Figure 25 Schematic diagram of the cross-sectional structure of the center protection plate.

[0050] [Description of Reference Numerals]

[0051] 1: Box body; 10: Accommodation space; 11: First chamber; 12: Second chamber;

[0052] 2: Separator: 21: First through hole; 22: First adhesive layer; 23: Second adhesive layer; 24: First blocking strip; 25: Second blocking strip;

[0053] 3: battery cell group; 31: battery cell; 311: first wall; 312: pressure relief mechanism;

[0054] 4: Protective plate; 41: Main body; 42: Raised portion; 421: Bottom wall; 422: Peripheral wall; 4221: First side wall; 4222: Second side wall; 4223: Third side wall; 4224: Fourth side wall; 423: First portion; 424: Second portion; 425: Middle portion; 4251: First middle wall; 4252: Second middle wall; 43: Weak portion; 431: First section; 432: Second section; 433: Second through hole; 434: First groove; 4341: First side; 4341a: First side edge; 4342: Second side edge; 4342a: Third side edge; 4351: Third side edge; 4351a: Second side edge; 4352: Fourth side edge; 4352a: Fourth side edge; 435: Second groove; A: First direction; B: Second direction; C: Thickness direction of the partition plate. DETAILED DESCRIPTION

[0055] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0057] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0059] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0060] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0061] In the related art, an exhaust channel is set up in the box body, and the exhaust channel is separated from the area where the battery cell is located. If the battery cell has a thermal runaway, the ejecta will break through the explosion-proof valve and be ejected. The exhaust channel can evacuate the ejecta to prevent the negative impact of high temperature and high pressure on other battery cells. However, it was found during the experiment that the ejecta can easily affect other battery cells due to diffusion or bottoming out in the exhaust channel. And because the ejecta are substances inside the battery cell and have conductivity, when the ejecta come into contact with other conductive objects such as metal liquid cooling plates, a short circuit problem will occur in the battery pack, causing a more serious thermal runaway chain reaction. Therefore, it is necessary to develop a battery pack with a protective plate. When a battery cell has a thermal runaway, the protective plate can protect other battery cells.

[0062] In view of this, reference Figures 1 to 20 , an embodiment of the present application provides a battery pack, which includes a box body 1, a partition plate 2, a battery cell 31 and a protective plate 4, the box body 1 defines a storage space 10; the partition plate 2 is arranged in the storage space 10 and divides the storage space 10 into a first chamber 11 and a second chamber 12, the partition plate 2 has a first through hole 21, along the thickness direction C of the partition plate 2, the first through hole 21 passes through the partition plate 2; the battery cell 31 is arranged in the first chamber 11, the battery cell 31 includes a first wall 311 and a pressure relief mechanism 312 arranged on the first wall 311, the first wall 311 and the pressure relief mechanism 312 are both facing the partition plate 2, along the thickness direction C of the partition plate 2, the pressure relief mechanism 312 is disposed on the first wall 311, The structure 312 is arranged opposite to the first through hole 21; along the thickness direction C of the partition plate 2, the protective plate 4 includes a main body 41 and a protrusion 42, the main body 41 is arranged between the first wall 311 and the partition plate 2, the protrusion 42 extends into the first through hole 21, and the protrusion 42 is at least partially separated from the inner peripheral wall 422 of the first through hole 21, wherein the protrusion 42 is provided with a weak portion 43, along the thickness direction C of the partition plate 2, the projection of the pressure relief mechanism 312 and the projection of the weak portion 43 at least partially overlap, and the weak portion 43 is constructed to be destroyed by high-temperature and high-pressure materials after the pressure relief mechanism 312 punches the valve, so as to connect the internal space of the battery cell 31 with the second chamber 12.

[0063] In the battery pack proposed in the embodiment of the present application, battery cells 31 are disposed within the first chamber 11. A pressure relief mechanism 312 is provided on the first wall 311 of the battery cells 31 facing the partition plate 2. The pressure relief mechanism 312 is positioned opposite the first through-hole 21 provided in the partition plate 2. A weak portion 43 is provided on the raised portion 42. When a battery cell 31 experiences thermal runaway and erupts after the pressure relief mechanism 312 purges, the ejected high-temperature, high-pressure material can more easily break through the weak portion 43, destroying the raised portion 42 and forming a channel connecting to the second chamber 12. The ejected material then enters the second chamber 12 and spreads within it. When the ejected material hits the bottom of the exhaust channel and rebounds, the raised portion 42 corresponding to the battery cell 31 not experiencing thermal runaway protects the battery cell 31 and the pressure relief mechanism 312, reducing damage to the battery cell 31 not experiencing thermal runaway and the pressure relief mechanism 312.

[0064] Along the thickness direction C of the partition plate 2, the projection of the pressure relief mechanism 312 at least partially overlaps the projection of the weak portion 43. When a battery cell 31 experiences thermal runaway and erupts after the pressure relief mechanism 312 purges, the ejected high-pressure fluid directly faces the weak portion 43, making it easier for the fluid to penetrate the weak portion 43.

[0065] In addition, the protrusion 42 extends into the first through hole 21, and the protrusion 42 is at least partially separated from the inner peripheral wall 422 of the first through hole 21, that is, there is a distance between at least part of the protrusion 42 and the first through hole 21, which facilitates the entry of the protective plate 4 into the first through hole 21 during assembly, and the distance between the protrusion 42 and the first through hole 21 forms an air interlayer. When the battery cell 31 thermally runs away, the air interlayer has the effect of heat insulation, reduces the damage to the partition plate 2 caused by high temperature, and improves the safety performance of the battery pack.

[0066] It should be understood that the provision of the weak portion 43 on the raised portion 42 causes the raised portion 42 to lose its structural integrity. The weak portion 43 is relatively weak, and when the battery cell 31 experiences thermal runaway, the high-pressure ejecta ejected by the pressure relief mechanism 312 can more easily damage the raised portion 42 of the protective plate 4, thereby reducing the possibility that the raised portion 42 should be torn but is not. If the raised portion 42 is not damaged, the ejecta will enter other locations, such as the battery area, through other weak points, affecting other battery cells 31 and causing them to be heated by the ejecta. If the ejecta cannot continue to be discharged or is blocked from discharge, it may cause the battery cell 31 to explode. The provision of the weak portion 43 ensures that when the battery cell 31 experiences thermal runaway, the ejecta will definitely damage the raised portion 42, thereby forming a gap, allowing the ejecta to smoothly pass through the gap and discharge into the second chamber 12. Furthermore, the ejecta discharged into the second chamber are blocked away due to the protection of the protrusions corresponding to other battery cells, thereby avoiding affecting other battery cells and reducing the probability of affecting or even damaging other battery cells due to thermal runaway.

[0067] Optionally, refer to Figure 19 、 Figure 25 and Figure 26 The raised portion 42 includes a bottom wall 421 and a peripheral wall 422. The peripheral wall 422 connects the outer periphery of the bottom wall 421 to the main body 41. The main body 41 is arranged between the first wall 311 of the battery cell 31 and the partition plate 2, and the protrusion extends into the first through hole 21. In other words, the bottom wall 421 and the peripheral wall 422 of the raised portion 42 extend into the first through hole 21. When the battery cell 31 experiences thermal runaway and erupts after the pressure relief mechanism 312 flushes the valve, the ejected high-temperature and high-pressure material impacts the bottom wall 421 and the peripheral wall 422, destroying the raised portion 42. The erupted material enters the second chamber 12 and spreads within the second chamber 12. At the same time, it protects the battery cell 31 and reduces the damage of the remaining battery cells 31 that have not experienced thermal runaway from the erupted material in the second chamber 12. Optionally, the weak portion 43 can be provided on the bottom wall 421 or the peripheral wall 422.

[0068] Optionally, refer to Figure 25 Along the circumference of the first through-hole 21, the peripheral wall 422 includes a first side wall 4221, a second side wall 4222, a third side wall 4223, and a fourth side wall 4224, which are connected in sequence. Along the first direction A, the first side wall 4221 and the third side wall 4223 are disposed opposite each other, and along the second direction B, the second side wall 4222 and the fourth side wall 4224 are disposed opposite each other. The first direction A and the second direction B intersect with the thickness direction C of the partition plate 2 in pairs. The bottom wall 421 connects the first side wall 4221, the second side wall 4222, the third side wall 4223, and the fourth side wall 4224. The projection of the bottom wall 421 along the thickness direction C of the partition plate 2 is a polygonal structure, and the projection of the peripheral wall 422 is also a polygonal structure.

[0069] Optionally, along the thickness direction C of the partition plate 2, the distances between the first side wall 4221 and the third side wall 4223 are the same, and the distances between the second side wall 4222 and the fourth side wall 4224 are the same. The bottom wall 421 connects the first side wall 4221, the second side wall 4222, the third side wall 4223, and the fourth side wall 4224. The projection of the bottom wall 421 can be square, and the projection of the peripheral wall 422 can also be square. The cross-section of the peripheral wall 422 along the first direction A is square.

[0070] Optionally, refer to Figure 25Along the thickness direction C of the separator plate 2 and away from the battery cell 31, the distance between the first side wall 4221 and the third side wall 4223 gradually decreases, and / or the distance between the second side wall 4222 and the fourth side wall 4224 gradually decreases. Along the thickness direction C of the separator plate 2 and away from the battery cell 31, only the distance between the first side wall 4221 and the third side wall 4223 may gradually decrease, or only the distance between the second side wall 4222 and the fourth side wall 4224 may gradually decrease. Alternatively, all of the first side wall 4221, the second side wall 4222, the third side wall 4223, and the fourth side wall 4224 may gradually decrease. The bottom wall 421 connects the first side wall 4221, the second side wall 4222, the third side wall 4223, and the fourth side wall 4224. The projection of the bottom wall 421 may be square, and the projection of the peripheral wall 422 may also be square. The cross-section of the peripheral wall 422 along the first direction A is trapezoidal, and the cross-section of the peripheral wall 422 along the second direction B is square; or, the cross-section of the peripheral wall 422 along the first direction A is square, and the cross-section of the peripheral wall 422 along the second direction B is trapezoidal; or, the cross-section of the peripheral wall 422 along the first direction A is trapezoidal, and the cross-section of the peripheral wall 422 along the second direction B is trapezoidal.

[0071] Optionally, refer to Figure 17 The weak portion 43 is located on the bottom wall 421. When a battery cell 31 experiences thermal runaway and the pressure relief mechanism 312 flushes the valve, the ejected high-pressure fluid directly faces the bottom wall 421 of the protrusion 42. The weak portion 43 located on the bottom wall 421 allows the high-pressure fluid to more effectively penetrate the weak portion 43. If the weak portion 43 were located on the peripheral wall 422, the high-pressure fluid would impact the bottom wall 421, and the weak portion 43 would be subjected to the tensile force transmitted from the bottom wall 421. This tensile force would be weakened, and the weak portion 43 might not be able to be successfully flushed immediately, affecting the discharge of the high-pressure fluid and potentially causing accumulation and blockage of the high-pressure fluid, thereby affecting the performance of the battery cell 31.

[0072] Optionally, refer to Figure 25 The weak portion 43 is located at the junction of the bottom wall 421 and the peripheral wall 422. When the battery cell 31 experiences thermal runaway and the pressure relief mechanism 312 flushes the valve and erupts, the ejected high-pressure fluid directly faces the bottom wall 421 of the protrusion 42. The weak portion 43 is located at the junction of the bottom wall 421 and the peripheral wall 422. The force of the high-pressure fluid impacting the bottom wall 421 is transmitted to the junction of the bottom wall 421 and the peripheral wall 422, making it easier for the high-pressure fluid to break through the weak portion 43.

[0073] Optionally, refer to Figure 21The raised portion 42 includes a first portion 423, an intermediate portion 425, and a second portion 424. Along a first direction A, the first portion 423 is connected between one end of the intermediate portion 425 and the main body 41, and the second portion 424 is connected between the other end of the intermediate portion 425 and the main body 41. Along a second direction B, both ends of the intermediate portion 425 are connected to the main body 41. The first direction A, the second direction B, and the thickness direction C of the partition plate 2 intersect with each other. Specifically, along the first direction A, one end of the first portion 423 is connected to the main body 41, the other end of the first portion 423 is connected to the intermediate portion 425, and one end of the second portion 424 is connected to the main body 41, while the other end is connected to the intermediate portion 425. Along the second direction B, both ends of the intermediate portion 425 are connected to the main body 41. It should be understood that the cross-section of the raised portion 42 along the first direction A can be arcuate, square, V-shaped, trapezoidal, or the like.

[0074] Optionally, refer to Figure 22 Along the first direction A, the cross-section of the inner side of the middle portion 425 is an arc that convexly extends away from the battery cell 31. The inner side of the middle portion 425 is the side facing the battery cell 31, and along the first direction A, the middle portion 425 is an arc that convexly extends toward the second chamber 12. When the middle portion 425 is an arc, the weak portion 43 can be located anywhere within the middle portion 425. In one specific embodiment, the weak portion 43 is located at the position within the middle portion 425 closest to the bottom wall 421 of the second chamber 12. That is, along the thickness direction C of the partition plate 2, the weak portion 43 is located at the position farthest from the partition plate 2, i.e., at the lowest point of the middle portion 425. When a battery cell 31 experiences thermal runaway and the pressure relief mechanism 312 ejects fluid after the valve is opened, the ejected high-pressure fluid directly impacts the lowest point of the middle portion 425, making it easier for the fluid to break through the weak portion 43.

[0075] Optionally, refer to Figure 23 Along the second direction B, the middle portion 425 includes a first middle wall 4251 and a second middle wall 4252 connected at an angle. One end of the first middle wall 4251 is connected to the main body 41, one end of the second middle wall 4252 is connected to the main body 41, and the other end of the first middle wall 4251 is connected to the other end of the second middle wall 4252. Along the first direction A, the cross-section of the middle portion 425 can be V-shaped. When the battery cell 31 experiences thermal runaway and the pressure relief mechanism 312 ejects fluid after the valve is opened, the ejected high-pressure fluid directly faces the V-shaped structure of the middle portion 425, making it easier for the high-pressure fluid to penetrate the weak portion 43.

[0076] Optionally, refer to Figure 24The weak portion 43 is located at the junction of the first intermediate wall 4251 and the second intermediate wall 4252. When a battery cell 31 experiences thermal runaway and the pressure relief mechanism 312 ruptures, the ejected high-pressure fluid can directly impact the weak portion, effectively applying the impact force directly to the weak portion. This means that the high-pressure fluid directly faces the bottom of the V-shaped structure of the intermediate portion 425, making it easier for the fluid to penetrate the weak portion 43.

[0077] Optionally, along the thickness direction C of the partition plate 2 , the projection of the pressure relief mechanism 312 falls within the projection of the weak portion 43 . When thermal runaway occurs in the battery cell 31 , the ejected material from the pressure relief mechanism 312 can directly face the protrusion 42 . The force of the ejected material is concentrated within the projection of the weak portion 43 , making it easier to destroy the weak portion 43 and allowing the ejected material to be smoothly discharged into the second chamber 12 .

[0078] In a specific embodiment, along the thickness direction C of the partition plate 2, the projection of the protrusion 42 falls within the projection of the first through hole 21, and the projection of the pressure relief mechanism 312 falls within the projection of the protrusion 42. When the battery cell 31 suffers thermal runaway, the ejecta ejected by the pressure relief mechanism 312 can all be ejected from the protrusion 42 to the second chamber 12, thereby reducing the ejecta entering other battery cells 31 and causing damage to other battery cells 31.

[0079] Optionally, refer to Figure 4 , the maximum distance between the end of the protrusion 42 away from the first wall 311 and the first wall 311 is H1, and the distance between the end of the first through hole 21 away from the first wall 311 and the first wall 311 is H2, satisfying: H1 ≥ H2. In other words, the end of the protrusion 42 away from the first wall 311 is lower than the end of the first through hole 21 away from the first wall 311. The protrusion 42 can fully cover the inner wall of the first through hole 21. When thermal runaway occurs in the battery cell 31, since the end of the protrusion 42 away from the first wall 311 is lower than the end of the first through hole 21 away from the first wall 311, the high-temperature conductive material is discharged through the protrusion 42 and is already lower than the first through hole 21, thereby preventing the high-temperature conductive medium from returning to the first through hole 21, and the protection effect is better. In other embodiments, the maximum distance between the end of the protrusion 42 away from the first wall 311 and the first wall 311 is H1, which is equal to the distance between the end of the first through hole 21 away from the first wall 311 and the first wall 311 is H2. The protrusion 42 can fully cover the inner wall of the first through hole 21 to provide insulation protection for the first through hole 21.

[0080] Optionally, refer to Figure 8The weak portion 43 is constructed as an annular structure connected end to end. The weak portion 43 is an annular structure provided on the raised portion 42. It should be understood that the annular weak portion 43 can be elliptical, square, circular, or a contoured structure that is the same shape as the bottom surface of the raised portion 42. As long as the weak portion 43 is constructed as a closed figure connected end to end, the thickness of the weak portion 43 is less than the thickness of the raised portion 42, and it can destroy the integrity of the raised portion 42, resulting in a lower strength and easily damaged area on the raised portion 42, the present application is not limited thereto.

[0081] Optionally, refer to Figure 6 , the weak portion 43 is constructed as a non-annular structure with the head and tail spaced apart. That is, along the length direction of the weak portion 43, the weak portion 43 has a first end and a second end spaced apart, then the weak portion 43 can be a line segment (such as Figure 10 ), it can be an arc, an "L"-shaped structure, a "C"-shaped structure, etc., as long as the weak portion 43 is constructed with a spacing between the two ends, the thickness of the weak portion 43 is less than the thickness of the protruding portion 42, and it can destroy the integrity of the protruding portion 42, so that the protruding portion 42 has an area with lower strength and is easily damaged. The present application is not limited to this.

[0082] In a specific embodiment, the weak portion 43 is constructed with a spacing between the two ends, that is, the weak portion is constructed as a "C"-shaped structure, thereby ensuring that the protrusion 42 has a certain strength and can be destroyed when the battery cell 31 undergoes thermal runaway and is impacted by high-temperature airflow.

[0083] Optionally, refer to Figure 9 The weak portion 43 includes a first section 431 and a second section 432. The extension direction of the first section 431 is different from the extension direction of the second section 432, and the first section 431 and the second section 432 intersect with each other. The first section 431 and the second end intersect with each other and are arranged at an angle. The thickness of the weak portion 43 is less than the thickness of the protruding portion 42, so that when the high-temperature airflow impacts the protruding portion 42, the weak portion 43 is more easily destroyed. Among them, the weak portion 43 can be a "cross" shape, an "X" shape, etc., as long as the weak portion 43 is constructed into two sections and the two sections intersect with each other, the thickness of the weak portion 43 is less than the thickness of the protruding portion 42, it can destroy the integrity of the protruding portion 42, so that the protruding portion 42 has an area with low strength and easy to be destroyed. The present application is not limited to this.

[0084] Optionally, refer to Figure 7 and Figure 16The weak portion 43 is provided with a second through hole 433, which extends through the weak portion 43 along its thickness. In other words, the protrusion 42 may be provided with a second through hole 433 that partially penetrates the protrusion 42, so that a portion of the protrusion 42 forms a weak portion 43 under the influence of the second through hole 433. Alternatively, the protrusion 42 may already have a weak portion 43 that is thinner than the protrusion 42, and then, at least a portion of the weak portion 43 is further penetrated by the second through hole 433, making the weak portion 43 more susceptible to damage by ejecta from the battery cell 31 experiencing thermal runaway.

[0085] Optionally, refer to Figure 7 and Figure 16 There are multiple second through holes 433 , and the multiple second through holes 433 are spaced apart along the extension direction of the weak portion 43 . That is, along the extension direction of the weak portion 43 , the weak portion 43 has multiple second through holes 433 spaced apart, and two adjacent second through holes 433 remain connected to each other. As a result, while the raised portion 42 has a certain strength, the weak portion 43 is easily damaged by the ejected material from the runaway battery cell 31 as a weaker area, thereby forming a gap between the structure surrounded by all the second through holes 433 and the raised portion 42, allowing the ejected material from the thermal runaway battery cell 31 to be discharged into the second chamber 12 .

[0086] In one embodiment, the thickness of the connection portion between two adjacent second through holes 433 is less than the thickness of the protrusion 42 . In another embodiment, the thickness of the connection portion between two adjacent second through holes 433 is the same as the thickness of the protrusion 42 .

[0087] In the present application, there is no limitation on the shape of the weak portion 43, the arrangement of the second through holes 433, and the arrangement of the connecting portion between two adjacent second through holes 433, as long as the weak portion 43 has a portion with a thickness lower than that of the protrusion 42, the weak portion 43 destroys the integrity of the protrusion 42, and the strength of the weak portion 43 is lower than that of the protrusion 42, so that it can be easily destroyed by high-pressure ejection objects.

[0088] Optionally, refer to Figure 12 、 Figure 19 and Figure 20 The raised portion 42 is further provided with a first groove 434, which is arranged opposite the weak portion 43 along the thickness direction of the weak portion 43. The thickness of the weak portion 43 is less than that of the raised portion 42, but the thickness of the weak portion 43 is not less than zero. In other words, the raised portion 42 is not provided with a through hole passing through the raised portion 42, and is only thinned to make the weak portion 43 more easily destroyed by the ejected material from the thermal runaway battery cell 31.

[0089] Optionally, refer to Figure 12 and Figure 13 The first groove 434 has a first side surface 4341 and a second side surface 4342 that are opposite to and spaced apart from each other, the first side surface 4341 faces the battery cell 31, and the second side surface 4342 faces away from the battery cell 31, and the first side surface 4341 has a first side edge 4341a away from the battery cell 31; along the thickness direction of the weak portion 43, the projection of the first side edge 4341a falls within the projection of the second side surface 4342.

[0090] Specifically, one side of the weak portion 43 is thinned so that the thickness of the weak portion 43 is less than that of the raised portion 42, thereby defining a first groove 434 on the weak portion 43. Along the width of the weak portion 43, the first groove 434 has a first side surface 4341 and a second side surface 4342 that are opposite to each other. The first side surface 4341 faces the battery cell 31, while the second side surface 4342 faces away from the battery cell 31. The bottom surface of the first groove 434 is connected between the first side surface 4341 and the second side surface 4342. The first side edge 4341a is the side edge where the first side surface 4341 and the bottom surface of the first groove 434 are connected. The projection of the first side edge 4341a is located within the projection of the second side surface 4342. That is to say, the first side surface 4341 and the second side surface 4342 are inclined relative to the bottom surface of the first groove 434, so that the weak portion 43 is better destroyed when the protrusion 42 is impacted by the ejection object, and when the protrusion 42 is affected by the ejection object and rebounds from the bottom, the side of the first side surface 4341 away from the battery cell 31 contacts the second side surface 4342, which can play a role in limiting the position.

[0091] It should be understood that no matter whether the weak portion 43 is configured into any one or more shapes such as circular, elliptical, square, linear segment or cross, the weak portion 43 and the raised portion 42 in this application can define a first groove 434.

[0092] In one specific embodiment, the weak portion 43 is configured as a closed figure connected end to end, such as an ellipse. The ellipse forms an elliptical impact zone on the protrusion 42, and the elliptical impact zone is connected to the protrusion 42 through the weak portion 43. The weak portion 43 defines a first groove 434, which has a first side 4341 and a second side 4342 that are opposite and spaced apart from each other. The first side 4341 faces the battery cell 31, and the second side 4342 faces away from the battery cell 31. Along the thickness direction of the weak portion 43, the projection of the first side 4341a falls within the projection of the second side 4342. That is to say, the elliptical impact zone has a side facing the battery cell 31 and a side facing away from the battery cell 31, and the maximum width of the side facing the battery cell 31 is smaller than the maximum width of the side facing away from the battery cell 31. When the protrusion 42 is impacted and falls off by the ejecta of the thermal runaway battery cell 31, and the elliptical impact zone is affected by the ejecta to bottom out and rebound, the first side edge 4341a of the first side surface 4341 contacts the second side surface 4342, which can play a role in limiting the position.

[0093] Optionally, refer to Figure 14 and Figure 15 、 Figure 18 The raised portion 42 is further provided with a first groove 434 and a second groove 435. These grooves are located on either side of the weak portion 43 along the thickness direction of the weak portion 43, with the first groove 434, the weak portion 43, and the second groove 435 being arranged in an opposing relationship. In other words, the opening of the first groove 434 and the opening of the second groove 435 are located on opposite sides of the separator plate 2 in the thickness direction C. In other words, the thickness of the weak portion 43 is reduced along the thickness direction C of the separator plate 2 on opposite sides thereof, such that the thickness of the weak portion 43 is smaller than that of the raised portion 42. When a battery cell 31 experiences thermal runaway, the weak portion 43 can be more easily destroyed by the ejecta discharged from the battery cell 31.

[0094] Optionally, refer to Figure 14 and Figure 15, the first groove 434 is closer to the battery cell 31 than the second groove 435, and the first groove 434 has a first side 4341 and a second side 4342 that are opposite to and spaced apart from each other, the first side 4341 faces the battery cell 31, and the second side 4342 faces away from the battery cell 31; the second groove 435 has a third side 4351 and a fourth side 4352 that are opposite to and spaced apart from each other, the third side 4351 faces the battery cell 31, and the fourth side 4352 faces away from the battery cell 31, the third side 4351 has a second side 4351a away from the battery cell 31, the second side 4342 has a third side 4342a close to the battery cell 31, and the fourth side 4352 has a fourth side 4352a away from the battery cell 31; along the thickness direction of the weak portion 43, the projection of the second side 4351a falls between the projection of the third side 4342a and the projection of the fourth side 4352a.

[0095] Specifically, the first side surface 4341 and the second side surface 4342 are inclined relative to the bottom surface of the first groove 434, and the third side surface 4351 and the fourth side surface 4352 are inclined relative to the bottom surface of the second groove 435, so that the weak portion 43 is better able to fall off when impacted by the ejecta of the thermal runaway battery cell 31, and when the raised portion 42 is affected by the ejecta and rebounds from the bottom, the side of the third side surface 4351 away from the battery cell 31 contacts the second side surface 4342, which can play a role in limiting the position.

[0096] It should be understood that the cross-sectional shape of the first groove 434 and the second groove 435 can be square (refer to Figure 19 and Figure 20 ), parallelogram (reference Figures 12 to 15 ), trapezoidal and V-shaped (reference Figure 18 ), etc., and the openings of the first groove 434 and / or the second groove 435 can be toward the battery cell 31 or away from the battery cell 31, depending on the specific usage.

[0097] Optionally, refer to Figure 1The battery pack includes multiple battery cell groups 3 arranged along a first direction A. Each battery cell group 3 includes multiple battery cells 31 arranged along a second direction B. The thickness direction C of the partition plate 2, the first direction A, and the second direction B intersect in pairs. Multiple protective plates 4 are provided, each positioned opposite a corresponding battery cell group 3 along the thickness direction C of the partition plate 2. Each main body 41 is provided with multiple protrusions 42. The battery pack includes multiple battery cell groups 3 arranged along the first direction A, each corresponding to a protective plate 4. Each battery cell group 3 includes multiple battery cells 31 arranged along the second direction B. Each protective plate 4 is provided with multiple protrusions 42, one for each battery cell 31. Optionally, the partition plate 2 is made of metal and can be configured as a liquid cooling plate, a partition, a support, or the like. When the partition plate 2 is a liquid cooling plate, the coolant flowing in the liquid cooling plate can cool the battery cells 31 while cooling the ejecta entering the second chamber 12, thereby effectively controlling the temperature of the ejecta and reducing the impact of excessive temperature on other battery cells 31.

[0098] Optionally, refer to Figure 1 and Figure 4 The side of the separator 2 facing the battery cell 31 is provided with a first adhesive layer 22 and a second adhesive layer 23. Along the first direction A, the first adhesive layer 22 and the second adhesive layer 23 are located on both sides of the protective plate 4. The projection of the main body 41 of the protective plate 4 at least partially covers the projection of one battery cell 31, but the projection of the main body 41 of the protective plate 4 does not completely cover the projection of the battery cell 31. The protective plate 4, the first adhesive layer 22 and the second adhesive layer 23 are provided between the battery cell 31 and the separator 2. The first adhesive layer 22 and the second adhesive layer 23 improve the connection strength between the battery cell 31 and the separator 2, thereby improving the stability of the fixation of the battery cell 31. At the same time, the first adhesive layer 22 and the second adhesive layer 23 also seal the connection between the battery cell 31 and the separator 2, preventing the spray from escaping to the battery area through the connection between the separator 2 and the main body 41 of the protective plate 4, thereby affecting other battery cells 31.

[0099] Optionally, refer to Figure 1 and Figure 4A first rubber stopper strip 24 and a second rubber stopper strip 25 are provided on the side of the separator plate 2 facing the battery cell 31. Along the first direction A, the first rubber stopper strip 24 is located between the first rubber layer 22 and the protective plate 4, and the second rubber stopper strip 25 is located between the second rubber layer 23 and the protective plate 4. The first and second rubber stopper strips 24 and 25 limit the thickness of the first and second rubber layers 22 and 23, and can block the first and second rubber layers 22 and 23, preventing them from entering the second chamber 12 through the connection between the protective plate 4 and the battery cell 31 or the separator plate 2. This reduces the probability of the second chamber 12 being blocked by the first and second rubber layers 22 and 23 entering, thereby allowing ejecta generated by thermal runaway of the battery cell 31 to be discharged smoothly.

[0100] In a second aspect, an embodiment of the present application provides an electrical device comprising the battery pack described in any of the above embodiments.

[0101] The battery pack in this application includes multiple battery cell groups 3 arranged along a first direction A, with each battery cell group 3 corresponding to a protective plate 4. Each battery cell group 3 includes multiple battery cells 31 arranged along a second direction B. Each protective plate 4 is provided with multiple protrusions 42, one corresponding to each battery cell 31. The cross-sectional shape of the protrusions 42 can be square, trapezoidal, arcuate, or V-shaped. The protrusions 42 are provided with a weakened portion 43, which is thinner than the protrusion 42. The shape of the weakened portion 43 can be a closed figure connected end to end, a line segment, two intersecting line segments, or an arc. The weakened portion 43 has a first groove 434 and / or a second groove 435. The first groove 434 and the second groove 435 can have a square, V-shaped, or other shape. In other words, the weakened portion 43 can be formed by thinning on one side to form the first groove 434, or by thinning on both sides to form the first groove 434 and the second groove 435. The weak portion 43 can destroy the integrity of the protrusion 42, making the thickness of the weak portion 43 smaller than that of the protrusion 42. When a battery cell 31 experiences thermal runaway, the explosive released from the battery cell 31 can easily destroy the protrusion 42 from the weak portion 43, thereby allowing the explosive within the battery cell 31 to be discharged. At the same time, the protrusion 42 protects other battery cells 31, reducing the chance of other battery cells 31 being damaged by the explosive. Furthermore, when the explosive causes the damaged protrusion 42 to rebound from the bottom, the protrusion 42 can prevent the explosive from entering the battery cell 31, reducing the impact of the explosive on the battery cell 31.

[0102] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0103] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0104] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

[0105] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that: include: A box body (1) defines a receiving space (10); a partition plate (2) disposed in the accommodating space (10) and dividing the accommodating space (10) into a first chamber (11) and a second chamber (12); the partition plate (2) having a first through hole (21); and the first through hole (21) passing through the partition plate (2) along a thickness direction (C) of the partition plate (2); A battery cell (31) is disposed in the first chamber (11), the battery cell (31) comprising a first wall (311) and a pressure relief mechanism (312), the pressure relief mechanism (312) being disposed on the first wall (311), the first wall (311) and the pressure relief mechanism (312) both facing the partition plate (2), and the pressure relief mechanism (312) being disposed opposite to the first through hole (21) along a thickness direction (C) of the partition plate (2); a protective plate (4), along a thickness direction (C) of the partition plate (2), the protective plate (4) comprising a main body (41) and a raised portion (42), the main body (41) being disposed between the first wall (311) and the partition plate (2), the raised portion (42) extending into the first through hole (21), and the raised portion (42) being at least partially spaced apart from an inner peripheral wall (422) of the first through hole (21); The protrusion (42) is provided with a weak portion (43), and along the thickness direction (C) of the partition plate (2), the projection of the pressure relief mechanism (312) and the projection of the weak portion (43) at least partially overlap, and the weak portion (43) is constructed to be destroyed by a high-temperature and high-pressure material after the pressure relief mechanism (312) punches the valve, so as to connect the internal space of the battery cell (31) with the second chamber (12).

2. The battery pack according to claim 1, wherein: The raised portion (42) includes a bottom wall (421) and a peripheral wall (422), and the peripheral wall (422) connects the outer periphery of the bottom wall (421) and the main body (41).

3. The battery pack according to claim 2, wherein: Along the circumference of the first through hole (21), the circumferential wall (422) includes a first side wall (4221), a second side wall (4222), a third side wall (4223) and a fourth side wall (4224) connected in sequence; Along the first direction (A), the first side wall (4221) and the third side wall (4223) are arranged opposite to each other, and along the second direction (B), the second side wall (4222) and the fourth side wall (4224) are arranged opposite to each other, and the first direction (A), the second direction (B) and the thickness direction (C) of the partition plate (2) intersect each other.

4. The battery pack according to claim 3, wherein: Along the thickness direction (C) of the partition plate (2), the distance between the first side wall (4221) and the third side wall (4223) is the same, and the distance between the second side wall (4222) and the fourth side wall (4224) is the same.

5. The battery pack according to claim 3, wherein: Along the thickness direction (C) of the partition plate (2) and in a direction away from the battery cell (31), the distance between the first side wall (4221) and the third side wall (4223) gradually decreases, and / or the distance between the second side wall (4222) and the fourth side wall (4224) gradually decreases.

6. The battery pack according to claim 2, characterized in that: The weak portion (43) is provided on the bottom wall (421).

7. The battery pack according to claim 2, characterized in that: The weak portion (43) is provided at the connection between the bottom wall (421) and the peripheral wall (422).

8. The battery pack according to claim 1, wherein: The raised portion (42) includes a first portion (423), an intermediate portion (425) and a second portion (424). Along a first direction (A), the first portion (423) is connected between one end of the intermediate portion (425) and the main body (41), and the second portion (424) is connected between the other end of the intermediate portion (425) and the main body (41). Along a second direction (B), both ends of the intermediate portion (425) are connected to the main body (41). The first direction (A), the second direction (B) and the thickness direction (C) of the partition plate (2) intersect each other.

9. The battery pack according to claim 8, characterized in that: Along the first direction (A), the cross section of the inner side surface of the middle portion (425) is an arc that bulges in a direction away from the battery cell (31).

10. The battery pack according to claim 8, characterized in that: Along the second direction (B), the middle portion (425) includes a first middle wall (4251) and a second middle wall (4252) connected at an angle, one end of the first middle wall (4251) is connected to the main body (41), one end of the second middle wall (4252) is connected to the main body (41), and the other end of the first middle wall (4251) is connected to the other end of the second middle wall (4252).

11. The battery pack according to claim 10, characterized in that: The weak portion (43) is provided at the connection between the first middle wall (4251) and the second middle wall (4252).

12. The battery pack according to claim 1, wherein: Along the thickness direction (C) of the partition plate (2), the projection of the pressure relief mechanism (312) falls within the projection of the weak portion (43).

13. The battery pack according to claim 1, wherein: The maximum distance between the end of the protrusion (42) away from the first wall (311) and the first wall (311) is H1, and the distance between the end of the first through hole (21) away from the first wall (311) and the first wall (311) is H2, satisfying: H1 ≥ H2.

14. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 13.

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