Battery pack and electric equipment

Abstract

The invention relates to the technical field of batteries, and discloses a battery pack and electric equipment.The battery pack comprises a box body, a partition plate and a battery monomer, the box body defines a containing space, the partition plate is arranged in the containing space and divides the containing space into a first cavity and a second cavity, and the battery monomer comprises a first wall and a pressure relief mechanism; the pressure relief mechanism is arranged on the first wall, the first wall and the pressure relief mechanism both face the partition plate, the partition plate comprises a plate body and a blocking ring, the plate body comprises a first plate part and a second plate part which are arranged at an interval, the blocking ring is an insulating part and comprises a blocking ring body and a limiting part, and the blocking ring body is arranged between the first plate part and the second plate part; the second plate part is provided with a first through hole, the first through hole penetrates through the second plate part and is opposite to the pressure relief mechanism, and the limiting piece can limit the blocking ring body to be separated from the position between the first plate part and the second plate part. The technical problem that short circuit of a battery pack is easily caused by sprayed high-temperature and high-pressure substances when thermal runaway occurs to single batteries is solved.

Description

Technical Field

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

[0002] With the increasing number of electrical devices, the use of batteries is becoming more and more extensive. The battery pack divides the internal space into an exhaust area and a battery area through a partition. The battery cells are arranged in the battery area. The battery cells include explosion-proof valves (which are actually pressure relief mechanisms). The explosion-proof valves face the exhaust area. When the battery cells are in thermal runaway, the high-temperature and high-pressure substances ejected from the explosion-proof valves rush to the exhaust area, reducing the impact of the runaway battery cells on normal battery cells. However, in the related art, when the battery cells are in thermal runaway, the insulating layer covers the hole wall. When the battery cells are depressurized, the high-temperature and high-pressure substances may destroy the insulating layer, thereby causing a short circuit, causing heat diffusion, and triggering thermal runaway of other normal battery cells, seriously endangering the safety of the battery pack. Summary of the invention

[0003] The present application provides a battery pack and electrical equipment, which solve the technical problem that when a battery cell undergoes thermal runaway, the ejection of high-temperature and high-pressure substances easily causes a short circuit in the battery pack.

[0004] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, a battery pack has a first direction, the battery pack includes a box body, a partition plate and a plurality of battery cells, the box body defines a accommodating space, the partition plate is arranged in the accommodating space and divides the accommodating space into a first chamber and a second chamber, a plurality of battery cells are arranged in the first chamber, the battery cells include a first wall and a pressure relief mechanism, the pressure relief mechanism is arranged on the first wall, the first wall and the pressure relief mechanism are both facing the partition plate, wherein the partition plate includes a plate body and a barrier ring, the plate body includes a first plate portion and a second plate portion arranged at intervals, along the first direction, the first plate portion and the second plate portion are both connected to the first wall, the barrier ring is an insulating member, the barrier ring includes a barrier ring body and a limiter, the barrier ring body is arranged between the first plate portion and the second plate portion, and surrounds the second plate portion, the second plate portion has a first through hole, along the first direction, the first through hole passes through the second plate portion and is arranged opposite to the pressure relief mechanism, the limiter is connected to the barrier ring body, the limiter can limit the barrier ring body from being separated from between the first plate portion and the second plate portion, and the first direction is parallel to the thickness direction of the plate body.

[0006] Along the first direction, the first through hole is arranged opposite to the pressure relief mechanism. The barrier ring includes a barrier ring body and a limiter. The limiter is constructed to limit the barrier ring from being separated from the plate body, so that the connection between the barrier ring and the plate body is more stable. The barrier ring can play an insulating effect, maintain the insulation of the partition plate, and play a role in protecting the battery cell.

[0007] Optionally, along the first direction, the first plate portion has a first side surface facing the first wall and a second side surface away from the first wall, along the first direction, the blocking ring body passes through the plate body, and the blocking ring body has a first end facing the first wall and a second end away from the first wall, the first end does not exceed the first side surface, and the second end does not exceed the second side surface.

[0008] Along the first direction, the barrier ring body penetrates the plate body, so that when the battery cell is depressurized, the released high-temperature and high-pressure substances impact the weak area and will not affect the barrier ring, thereby not affecting the insulation function of the barrier ring, thereby ensuring the insulation of the partition plate, thereby reducing the risk of the substances released by the thermal runaway battery cell electrically conducting the partition plate and other battery cells, thereby improving safety.

[0009] Optionally, the structural strength of the plate body is greater than the structural strength of the barrier ring.

[0010] The structural strength of the plate body is greater than that of the barrier ring, which can prevent high-pressure substances ejected from thermal runaway battery cells from damaging the first plate portion or the second plate portion, thereby improving the reliability of the battery pack.

[0011] Optionally, the limiting member includes a first limiting portion, and along the first direction, two ends of the first limiting portion are respectively connected to the first wall and the first end, and the first limiting portion protrudes from the first side surface and contacts the first side surface.

[0012] The first limiting portion protrudes from the first side surface and contacts the first side surface, so that the first limiting portion can reduce the probability of the first wall contacting the plate body, thereby reducing the probability of short circuit of the battery cell, thereby reducing the probability of failure of good quality battery cells, and improving the stability and reliability of the battery pack.

[0013] Optionally, along the first direction, an orthographic projection area of ​​the first limiting portion on the first wall is larger than an orthographic projection area of ​​the blocking ring body on the first wall.

[0014] The orthographic projection area of ​​the first limiting portion on the first wall is larger than the orthographic projection area of ​​the barrier ring body on the first wall, which can enable the first limiting portion to fully abut against the first side surface, making the barrier ring and the plate body more firmly connected, reducing the probability of the barrier ring and the plate body being separated, ensuring the insulation between the first plate portion and the second plate portion, and improving the stability and reliability of the battery pack.

[0015] Optionally, the limiting member further includes a second limiting portion, which is disposed at the second end and protrudes from the second side surface and contacts the second side surface.

[0016] The second limiting portion protrudes from the second side surface and contacts the second side surface, which can make the connection between the barrier ring body and the plate body more stable, reduce the risk of connection failure between the two, and reduce the probability of battery pack failure.

[0017] Optionally, along the first direction, an orthographic projection area of ​​the second limiting portion on the first wall is larger than an orthographic projection area of ​​the blocking ring body on the first wall.

[0018] The orthographic projection area of ​​the second limiting portion on the first wall is larger than the orthographic projection area of ​​the barrier ring body on the first wall, which can enable the second limiting portion to fully abut against the second side surface, making the barrier ring and the plate body more firmly connected, reducing the probability of the barrier ring and the plate body being separated, ensuring the insulation between the first plate portion and the second plate portion, and improving the stability and reliability of the battery pack.

[0019] Optionally, the limiting member includes a third limiting portion, which is connected to the first end along the first direction, and the third limiting portion does not extend beyond the first side surface. The blocking ring body has a first circumferential surface facing away from the first through hole, and the third limiting portion protrudes from the first circumferential surface. The first plate portion has a first limiting groove, and the first limiting groove passes through the first side surface. The third limiting portion is embedded in the first limiting groove.

[0020] The third limiting portion is embedded in the first limiting groove, so that the barrier ring can be more firmly connected between the first plate portion and the second plate portion, reducing the probability of separation between the barrier ring and the first plate portion and the second plate portion, and improving the stability of the connection between the barrier ring and the first plate portion and the second plate portion, thereby strengthening the insulation effect of the partition plate. When the battery cell is depressurized, the released high-temperature and high-pressure substances impact the first through hole, which will not affect the barrier ring, thereby not affecting the insulation function of the barrier ring, ensuring the insulation of the partition plate, thereby reducing the risk of substances released by thermal runaway battery cells electrically conducting the partition plate and other battery cells, and improving safety.

[0021] Optionally, the limiting member also includes a fourth limiting portion, which is spaced apart from the third limiting portion along the first direction, and is connected to the second end, and does not extend beyond the second side surface, the blocking ring body has a second circumferential surface facing the first through hole, the fourth limiting portion protrudes from the second circumferential surface, the second plate portion has a third side surface away from the first wall, the second plate portion has a second limiting groove, the second limiting groove passes through the third side surface, and the fourth limiting portion is embedded in the second limiting groove.

[0022] The fourth limiting portion is embedded in the second limiting groove, so that the barrier ring can be more firmly connected between the first plate portion and the second plate portion, reducing the probability of separation between the barrier ring and the first plate portion and the second plate portion, and improving the stability of the connection between the barrier ring and the first plate portion and the second plate portion, thereby strengthening the insulation effect of the partition plate. When the battery cell is depressurized, the released high-temperature and high-pressure substances impact the first through hole, and will not affect the barrier ring, thereby not affecting the insulation function of the barrier ring, thereby ensuring the insulation of the partition plate, thereby reducing the risk of substances released by thermal runaway battery cells electrically conducting the partition plate and other battery cells, thereby improving safety.

[0023] Optionally, the limiting member also includes a fifth limiting portion connected to the second end, the fifth limiting portion is connected to the fourth limiting portion, and the fifth limiting portion and the third limiting portion are spaced apart along the first direction, the fifth limiting portion protrudes from the first circumferential surface, the first plate portion has a third limiting groove, the third limiting groove passes through the second side surface, and the fifth limiting portion is embedded in the third limiting groove, the limiting member also includes a sixth limiting portion connected to the first end, the sixth limiting portion is connected to the third limiting portion, and the sixth limiting portion and the fourth limiting portion are spaced apart along the first direction, the sixth limiting portion protrudes from the second circumferential surface, the second plate portion also has a fourth side surface facing the first wall, the second plate portion has a fourth limiting groove, the fourth limiting groove passes through the fourth side surface, and the sixth limiting portion is embedded in the fourth limiting groove.

[0024] The fifth limiting portion is embedded in the third limiting groove, and the sixth limiting portion is embedded in the fourth limiting groove, so that the barrier ring can be more firmly connected between the first plate portion and the second plate portion, reducing the probability of the barrier ring being detached from the first plate portion and the second plate portion, and improving the stability of the connection between the barrier ring and the first plate portion and the second plate portion, thereby strengthening the insulation effect of the partition plate. When the battery cell is depressurized, the released high-temperature and high-pressure substances impact the first through hole, and will not affect the barrier ring, thereby not affecting the insulation function of the barrier ring, thereby ensuring the insulation of the partition plate, thereby reducing the risk of the substances released by the thermal runaway battery cell electrically conducting the partition plate and other battery cells, thereby improving safety.

[0025] Optionally, the blocking ring body has a first circumferential surface facing away from the first through hole and a second circumferential surface facing the first through hole, the limiting member includes a first protrusion, the first protrusion is protruding from the first circumferential surface, the first plate portion has a first groove, the first protrusion is embedded in the first groove, the limiting member includes a second protrusion, the second protrusion is protruding from the second circumferential surface, the second plate portion has a second groove, and the second protrusion is embedded in the second groove.

[0026] In this way, the barrier ring can be more firmly connected between the first plate portion and the second plate portion, the probability of the barrier ring being detached from the first plate portion and the second plate portion is reduced, the stability of the connection between the barrier ring and the first plate portion and the second plate portion is improved, and the insulation effect of the partition plate is strengthened. When the battery cell is depressurized, the released high-temperature and high-pressure substances impact the first through hole, which will not affect the barrier ring, thereby not affecting the insulation function of the barrier ring, thereby ensuring the insulation of the partition plate, thereby reducing the risk of substances released by thermal runaway battery cells electrically conducting the partition plate and other battery cells, and improving safety.

[0027] Optionally, the barrier ring body has a first circumferential surface facing away from the first through hole and a second circumferential surface facing the first through hole, the first circumferential surface is provided with a third groove recessed toward the first through hole, the first plate portion has a third protrusion, the third protrusion is embedded in the third groove, the second circumferential surface is provided with a fourth groove recessed away from the first through hole, the second plate portion has a fourth protrusion, and the fourth protrusion is embedded in the fourth groove.

[0028] The third protrusion is embedded in the third groove, and the fourth protrusion is embedded in the fourth groove, so that the barrier ring can be more firmly connected between the first plate portion and the second plate portion, reducing the probability of the barrier ring being detached from the first plate portion and the second plate portion, and improving the stability of the connection between the barrier ring and the first plate portion and the second plate portion, thereby strengthening the insulation effect of the partition plate. When the battery cell is depressurized, the released high-temperature and high-pressure substances impact the first through hole, which will not affect the barrier ring, thereby not affecting the insulation function of the barrier ring, ensuring the insulation of the partition plate, thereby reducing the risk of substances released by thermal runaway battery cells electrically conducting the partition plate and other battery cells, and improving safety.

[0029] Optionally, along the first direction, the orthographic projection of the pressure relief mechanism on the plate body falls into the first through hole.

[0030] The orthographic projection of the pressure relief mechanism on the plate body falls into the first through hole, which can prevent the high-temperature and high-pressure substances released by the thermal runaway battery cells from damaging the barrier ring, prevent affecting other normal battery cells, and improve the safety of the battery pack.

[0031] Optionally, along the first direction, the orthographic projection of the blocking ring on the first wall is arranged around the pressure relief mechanism, and the orthographic projection of the first through hole on the first wall covers the pressure relief mechanism.

[0032] The orthographic projection of the barrier ring on the first wall surrounds the pressure relief mechanism, and the orthographic projection of the first through hole on the first wall covers the pressure relief mechanism, which can prevent the high-temperature and high-pressure substances released by the thermal runaway battery cells from damaging the barrier ring, prevent affecting other normal battery cells, and improve the safety of the battery pack.

[0033] Optionally, multiple second plate portions and multiple barrier rings are provided, and the multiple second plate portions and the multiple barrier rings correspond one to one. Each second plate portion is connected to the first plate portion through a corresponding barrier ring. Along the first direction, the first through hole of each second plate portion and the corresponding pressure relief mechanism are relatively arranged.

[0034] The first through hole of each second plate portion and the corresponding pressure relief mechanism are arranged relative to each other, so that when each battery cell has a fault such as thermal runaway, the high-temperature and high-pressure material can be sprayed out through the pressure relief mechanism, and then enter the second chamber through the first through hole, without affecting the barrier ring, thereby not affecting the insulation function of the barrier ring, ensuring the insulation of the partition plate, so as to reduce the risk of the material released by the thermal runaway battery cell electrically conducting the partition plate and other battery cells, thereby improving safety.

[0035] Optionally, along the second direction, two adjacent barrier rings are connected via a first connecting portion, and the first connecting portion is fixed to the first plate portion.

[0036] The two adjacent barrier rings are connected by the first connecting portion, which can improve the stability of the connection between the adjacent barrier rings on the plate body, and can make the barrier ring more firmly connected to the first plate portion, thereby reducing the probability of the barrier ring and the first plate portion being detached, and improving the stability of the connection between the barrier ring and the first plate portion, thereby strengthening the insulation effect of the partition plate. When the battery cell is depressurized, the air pressure impacts the first through hole but will not impact the barrier ring, thereby not breaking the barrier ring, thereby ensuring the insulation of the partition plate, reducing the risk of substances released by the thermal runaway battery cell to electrically conduct the partition plate and other normal battery cells, and improving safety.

[0037] Optionally, along the second direction, the first connecting portion and the plurality of barrier rings are an integrally formed part.

[0038] The first connecting portion and the plurality of barrier rings are integrally formed. On the one hand, the integral forming method can make the connection between the barrier ring and the first connecting portion more stable, and can make the barrier ring more firmly connected to the plate body, thereby reducing the probability of the barrier ring and the plate body being separated, and improving the stability of the connection between the barrier ring and the plate body, thereby enhancing the insulation effect of the partition plate. When the battery cell is depressurized, the strong air pressure impacts the first through hole but does not impact the barrier ring, thereby not breaking the barrier ring, thereby ensuring the insulation of the partition plate, reducing the risk of the thermal runaway battery cell releasing substances to electrically conduct the partition plate and other normal battery cells, and improving safety. On the other hand, the integral forming method can also reduce the manufacturing cost of the first connecting portion and the barrier ring, thereby reducing the manufacturing cost of the battery pack.

[0039] Optionally, along the first direction, the first connecting portion passes through a side surface of the plate body.

[0040] The first connecting portion passes through one side of the plate body, which can make the barrier ring more firmly connected to the first plate portion, reduce the probability of the barrier ring and the first plate portion being separated, and improve the stability of the connection between the barrier ring and the first plate portion, thereby strengthening the insulation effect of the partition plate. When the battery cell is depressurized, the strong air pressure impacts the first through hole but will not impact the barrier ring, thereby not breaking the barrier ring, thereby ensuring the insulation of the partition plate, reducing the risk of substances released by the thermal runaway battery cell to electrically connect the partition plate and other normal battery cells, and improving safety.

[0041] In a second aspect, an embodiment of the present application further provides an electrical device, comprising a battery pack as described in any one of the embodiments of the present application.

[0042] The electrical equipment proposed in the embodiment of the present application has a first through hole and a pressure relief mechanism arranged opposite to each other along a first direction. The barrier ring includes a barrier ring body and a limiter. The limiter is configured to limit the barrier ring from being separated from the plate body, thereby making the connection between the barrier ring and the plate body more stable. The barrier ring can have an insulating effect, maintain the insulation of the partition plate, protect the battery cells, and improve the stability and reliability of the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. 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 paying any creative work.

[0044] Figure 1 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application;

[0045] Figure 2 for Figure 1 A top view of

[0046] Figure 3 for Figure 2 Section view in the AA direction;

[0047] Figure 4 for Figure 1 Schematic diagram of the explosion structure;

[0048] Figure 5 The structure of the pressure relief mechanism and the partition plate is shown;

[0049] Figure 6 The structure of the barrier ring and the plate body according to an embodiment of the present application is shown;

[0050] Figure 7 An embodiment of the present application is shown in Figure 6Cross-sectional view in the BB direction;

[0051] Figure 8 An embodiment of the present application is shown in Figure 6 Cross-sectional view in the BB direction;

[0052] Fig. 9 The structure of the first limiting groove is shown;

[0053] Fig.10 An embodiment of the present application is shown in Figure 6 Cross-sectional view in the BB direction;

[0054] Fig.11 The structure of the first limiting groove and the second limiting groove is shown;

[0055] Fig.12 An embodiment of the present application is shown in Figure 6 Cross-sectional view in the BB direction;

[0056] Fig.13 The structure of the first limiting groove, the second limiting groove, the third limiting groove and the fourth limiting groove are shown;

[0057] Fig.14 An embodiment of the present application is shown in Figure 6 Cross-sectional view in the BB direction;

[0058] Fig.15 The structure of the first groove and the second groove is shown;

[0059] Fig.16 An embodiment of the present application is shown in Figure 6 Cross-sectional view in the BB direction;

[0060] Fig.17 The structure of the third groove and the fourth groove is shown;

[0061] Fig.18 The relationship between the barrier ring and the first connecting portion is shown.

[0062] [Description of Reference Numerals]

[0063] Battery pack 100; box 110; partition plate 120; first side 120A; second side 120B; plate body 121; first through hole 121A; barrier ring 122; barrier ring body 122A; first limit portion 122B; second limit portion 122C; first chamber 130; second chamber 140; battery cell group 150; battery cell 150A; first wall 160; pressure relief mechanism 161; adhesive layer 170; accommodating space 180; third limit portion 200; fourth limit portion 210; fifth limit portion 220; sixth limit portion 230; first connection part 320; first protrusion 330; second protrusion 340; first plate part 350; second plate part 360; limiting member 370; third protrusion 380; fourth protrusion 390; first end 420; second end 430; first peripheral surface 440; second peripheral surface 450; first limiting groove 460; second limiting groove 470; third side surface 480; fourth side surface 490; third limiting groove 500; fourth limiting groove 510; first groove 520; second groove 530; third groove 540; fourth groove 550; first direction X; second direction Y; third direction Z. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution 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 creative work are within the scope of protection of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; 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" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0066] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0069] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0070] With the increasing number of electrical devices, the use scenarios of batteries are becoming more and more extensive. The battery pack divides the internal space into an exhaust area and a battery area through a partition. The partition is mostly made of metal, and its mechanical properties and thermal conductivity are relatively good. The battery cell is arranged in the battery area. The battery cell includes an explosion-proof valve (that is, a pressure relief mechanism). The explosion-proof valve faces the exhaust area. When the battery cell thermally runs away, the high-temperature and high-pressure substances ejected from the explosion-proof valve rush to the exhaust area through the through holes of the partition, reducing the impact of the out-of-control battery cell on the normal battery cell.

[0071] However, in the related technology, the high-temperature and high-pressure substances ejected when the battery cell thermally runs away are conductive, and the insulating layer covers the hole wall. When the battery cell is depressurized, the high-temperature and high-pressure substances may destroy the insulating layer, causing a short circuit, causing heat diffusion, and triggering thermal runaway of other normal battery cells, seriously endangering the safety of the battery pack.

[0072] In view of this, in order to solve the technical problem that when a battery cell undergoes thermal runaway, the ejection of high-temperature and high-pressure substances easily causes a short circuit in the battery pack, an embodiment of the present application proposes a battery pack and an electrical device, the battery pack comprising a box body, a partition plate and a battery cell.

[0073] 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 battery cell is arranged in the first chamber, the battery cell includes 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 are both facing the partition plate.

[0074] Among them, the partition plate includes a plate body and a barrier ring, the plate body includes a first plate portion and a second plate portion arranged at intervals, along the first direction, the first plate portion and the second plate portion are both connected to the first wall, the barrier ring is an insulating member, the barrier ring includes a barrier ring body and a limiter, the barrier ring body is arranged between the first plate portion and the second plate portion, and surrounds the second plate portion, the second plate portion has a first through hole, along the first direction, the first through hole passes through the second plate portion and is arranged opposite to the pressure relief mechanism, the limiter is connected to the barrier ring body, the limiter can limit the barrier ring body from being separated from between the first plate portion and the second plate portion, and the first direction is parallel to the thickness direction of the plate body.

[0075] In the above scheme, along the first direction, the first through hole penetrates the second plate portion and is arranged opposite to the pressure relief mechanism. A barrier ring is arranged in the partition plate to achieve an insulating effect, maintain the insulation of the partition plate, and protect the battery cells.

[0076] For the convenience of description, the following embodiments are described by taking a battery pack 100 according to an embodiment of the present application as an example.

[0077] Please refer to Figures 1 to 5 , Figure 1 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application; Figure 2 for Figure 1 A top view of Figure 3 for Figure 2 Section view in the AA direction; Figure 4 for Figure 1 Schematic diagram of the explosion structure; Figure 5 The structure of the pressure relief mechanism and the partition plate is shown.

[0078] The embodiment of the present application provides a battery pack 100, which has a first direction X. The battery pack 100 includes a box body 110, a partition plate 120, and a battery cell 150A. The box body 110 defines a storage space 180. The partition plate 120 is disposed in the storage space 180 and divides the storage space 180 into a first chamber 130 and a second chamber 140. The battery cell 150A is disposed in the first chamber 130. The battery cell 150A includes a first wall 160 and a pressure relief mechanism 161. The pressure relief mechanism 161 is disposed on the first wall 160. Both the first wall 160 and the pressure relief mechanism 161 face the partition plate 120. The partition plate 120 includes a plate body 121 and a barrier ring 122. The plate body 121 includes a first plate portion 350 and a first plate portion 350 disposed at intervals. The second plate portion 360, along the first direction X, the first plate portion 350 and the second plate portion 360 are both connected to the first wall 160, the blocking ring 122 is an insulating member, the blocking ring 122 includes a blocking ring body 122A and a limiting member 370, the blocking ring body 122A is arranged between the first plate portion 350 and the second plate portion 360, and surrounds the second plate portion 360, the second plate portion 360 has a first through hole 121A, along the first direction X, the first through hole 121A passes through the second plate portion 360 and is arranged opposite to the pressure relief mechanism 161, the limiting member 370 is connected to the blocking ring body 122A, the limiting member 370 can limit the blocking ring body 122A from being separated from between the first plate portion 350 and the second plate portion 360, and the first direction X is parallel to the thickness direction of the plate body 121.

[0079] The storage space 180 is arranged inside the box body 110, and the partition plate 120 is arranged in the storage space 180. The partition plate 120 divides the storage space 180 into a first chamber 130 and a second chamber 140, that is, the first chamber 130 and the second chamber 140 together constitute the storage space 180. The battery cell 150A is arranged in the first chamber 130, and the battery cell 150A includes a first wall 160 and a pressure relief mechanism 161, and the pressure relief mechanism 161 is arranged on the first wall 160. The first wall 160 and the pressure relief mechanism 161 are both arranged in the first chamber 130. The first wall 160 and the pressure relief mechanism 161 are both facing the partition plate 120, that is, the first wall 160 and the pressure relief mechanism 161 are both facing the second chamber 140. When the battery cell 150A overheats and thermal runaway occurs, the high-temperature material inside the battery cell 150A will be ejected from the pressure relief mechanism 161, and the high-temperature material will enter the second chamber 140.

[0080] The partition plate 120 includes a plate body 121 and a barrier ring 122. The plate body 121 includes a first plate portion 350 and a second plate portion 360. The barrier ring 122 is arranged between the first plate portion 350 and the second plate portion 360. The second plate portion 360 is provided with a first through hole 121A. The first through hole 121A penetrates the second plate portion 360 and is arranged opposite to the pressure relief mechanism 161. The barrier ring 122 penetrates the plate body 121 to separate the first plate portion 350 and the second plate portion 360. The barrier ring 122 envelops the first through hole 121A. The first through hole 121A is arranged opposite to the pressure relief mechanism 161. In this way, when the battery cell 150A overheats and thermal runaway occurs, the high-temperature and high-pressure substances inside the battery cell 150A will be ejected from the pressure relief mechanism 161, and the high-temperature substances enter the interior of the second chamber 140 through the first through hole 121A. The barrier ring 122 is disposed between the first through hole 121A and the plate body 121 . The barrier ring 122 separates the first plate portion 350 from the second plate portion 360 . The plate body 121 and the barrier ring 122 together constitute the partition plate 120 .

[0081] Since the partition plate 120 is mostly made of metal, the partition plate 120 has good electrical and thermal conductivity, and the plate body 121 also has good electrical conductivity. The barrier ring 122 is arranged between the first plate portion 350 and the second plate portion 360, so that the first plate portion 350 and the second plate portion 360 are insulated from each other, and current cannot flow from the second plate portion 360 to the first plate portion 350, and current cannot flow from the first plate portion 350 to the second plate portion 360.

[0082] In some possible implementations, the area where the first through hole 121A is located can be configured as a weak area. Along the first direction, the weak area is arranged opposite to the pressure relief mechanism 161. The barrier ring 122 is arranged in the partition plate 120, which can play an insulating effect, maintain the insulation of the partition plate 120, and protect the battery cell 150A. The weak area can be an area with weaker strength than other areas on the second plate portion 360. For example, the thickness of the weak area can be thinner. When the high-temperature and high-pressure material is ejected from the pressure relief mechanism 161, the high-temperature and high-pressure material can rush out of the weak area. Exemplarily, the weak area can be configured as a notch.

[0083] The barrier ring 122 includes a limit member 370 for limiting the barrier ring 122 from separating from the plate body 121. The limit member 370 further fixes the barrier ring 122 and the plate body 121. The limit member 370 can limit the barrier ring body 122A from separating from between the first plate portion 350 and the second plate portion 360, so that the barrier ring body 122A is stuck between the first plate portion 350 and the second plate portion 360, further reducing the probability of the barrier ring 122 separating from the plate body 121, thereby greatly improving the stability and reliability of the battery pack 100.

[0084] Specifically, the partition plate 120 is disposed in the accommodating space 180 and divides the accommodating space 180 into a first chamber 130 and a second chamber 140, which can separate the first chamber 130 from the second chamber 140, and can prevent the harmful gas or electrolyte generated by the battery cell 150A from directly contacting other parts of the battery case 110 when a fault such as thermal runaway or short circuit occurs, thereby reducing the probability of fire or explosion. In addition, the partition plate 120 can also serve as a barrier to prevent external objects or liquids from entering the first chamber 130 and causing damage to the battery cell 150A, thereby reducing the probability of failure of the battery cell 150A. The presence of the partition plate 120 can also increase the structural strength of the battery case 110, and can better protect the battery cell 150A when subjected to external impact or vibration.

[0085] The first plate portion 350 and the second plate portion 360 may both be connected to the first wall 160 , and the first plate portion 350 and the second plate portion 360 may support the battery cell 150A.

[0086] In some embodiments of the present application, the wall where the electrode terminals of the battery cell 150A are located may be disposed opposite to the first wall 160. For example, the electrode terminals of the battery cell 150A may be disposed on the top wall, and the first wall 160 may be the bottom wall.

[0087] The battery cell 150A includes a first wall 160 and a pressure relief mechanism 161, both of which face the partition plate 120. The pressure relief mechanism 161 can provide a safe channel for releasing pressure when the internal pressure of the battery cell 150A increases abnormally, thereby reducing the probability of battery explosion. The blocking ring 122 is arranged between the hole wall of the first through hole 121A and the outer peripheral surface of the plate body 121. When the battery cell 150A is out of control, the high-temperature conductive material is ejected from the pressure relief mechanism 161. Since the pressure relief mechanism 161 is arranged relative to the second through hole 123A, the high-temperature conductive material will contact the inner wall of the first through hole 121A. The blocking ring 122 is arranged between the plate body 121 and the inner wall of the first through hole 121A, which can block the current of the plate body 121 and the inner wall of the first through hole 121A, prevent the current leaked by the high-temperature material from damaging the normal battery cell 150A, and reduce the probability of damage to the normal battery cell 150A. The blocking ring 122 is arranged in the partition plate 120, which can have an insulating effect, maintain the insulation of the partition plate 120, and protect the battery cell 150A.

[0088] In some embodiments, the material of the insulating part can be set to silicon nitride, polyimide, polytetrafluoroethylene and polyphenylene sulfide. Silicon nitride has extremely high high temperature resistance and a melting point of up to 1900°C. It can maintain stable insulation performance even under extreme high temperature conditions and has excellent high voltage resistance, corrosion resistance and radiation resistance. Polyimide has excellent high temperature resistance and a long-term use temperature range of -200°C to 300°C. It also has good mechanical properties, electrical properties, chemical resistance and flame retardancy. Polytetrafluoroethylene has excellent high temperature resistance, a glass transition temperature of up to 143°C and a melting point of 343°C. It also has good mechanical properties, chemical resistance, self-lubrication and wear resistance. Polyphenylene sulfide has the characteristics of high mechanical strength, high temperature resistance and chemical resistance, and can maintain stable performance under high temperature and harsh chemical environments.

[0089] In some embodiments, the plate body 121 is constructed as a metal part, which can make the plate body 121 have high strength and hardness, and can effectively resist external impact and vibration, so as to keep the battery cell 150A inside the battery pack 100 from being damaged, and improve the strength and durability of the battery pack 100 structure. In addition, the metal part has good thermal conductivity. When the battery cell 150A fails such as thermal runaway, the plate body 121 can effectively conduct the heat generated by the battery cell 150A, reduce the temperature of the battery cell 150A, and thus reduce the probability of failure of the good battery cell 150A. It can be understood that the plate body 121 is set as a metal part, and can also provide electromagnetic shielding function for the battery pack 100, prevent the electromagnetic field generated by the battery cell 150A from interfering with external equipment or personnel, and ensure the electromagnetic compatibility and electromagnetic interference protection of the battery pack 100. Since the metal part has excellent corrosion resistance, the plate body 121 is set as a metal part to extend the service life of the battery pack 100.

[0090] In some embodiments, the metal piece can be made of metal materials such as stainless steel, magnesium alloy, and aluminum alloy.

[0091] In some embodiments, an adhesive layer 170 may be further disposed between the partition plate 170 and the battery cell 150A, and the first through hole 121A passes through the adhesive layer 170, further reducing the probability of high-temperature conductive material sprayed out of the out-of-control battery cell 150A damaging the good battery cell 150A, thereby improving the stability and reliability of the battery cell 150A.

[0092] The adhesive layer 170 can adhere and fix the battery cell 150A to the separator 120 , and the adhesive layer 170 can also be configured as an insulating member to insulate and isolate the battery cell 150A from the separator 120 .

[0093] Please refer to Figures 1 to 5In this embodiment, the inner area of ​​the barrier ring 122 is connected to the first through hole 121A.

[0094] Thus, the barrier ring 122 not only surrounds the first through hole 121A, but also the inner area of ​​the barrier ring 122 contacts the first through hole 121A, thereby increasing the insulation of the partition plate 120, protecting the battery cells 150A, reducing the probability of normal battery cells 150A being damaged, and improving the stability and reliability of the battery pack 100.

[0095] Please refer to Figures 1 to 5 In this embodiment, along the radial direction of the first through hole 121A, the barrier ring 122 is spaced apart from the first through hole 121A.

[0096] The first through hole 121A is separated from the barrier ring 122, that is, a plate body 121 is arranged between the first through hole 121A and the barrier ring 122, and a plate body 121 is also arranged between two adjacent barrier rings 122. It can be understood that the barrier ring 122 can be embedded between the first through hole 121A and the plate body 121, so that when some battery cells 121A are out of control, high-temperature and high-pressure substances will be ejected from the pressure relief mechanism 161, and the high-temperature and high-pressure substances will first impact the inner wall of the first through hole 121A, or the plate body 121 between the first through hole 121A and the barrier ring 122, thereby reducing the probability of the barrier ring 122 being damaged by the high-temperature and high-pressure substances, ensuring the insulation of the partition plate 120, and reducing the probability of normal battery cells 150A being damaged.

[0097] Please refer to Figures 1 to 5 In the present embodiment, along the first direction X, the plate body 121 has a first side surface 120A facing the first wall 160 and a second side surface 120B away from the first wall 160. Along the first direction X, the blocking ring body 122A passes through the plate body 121, and the blocking ring body 122A has a first end 420 facing the first wall 160 and a second end 430 away from the first wall 160. The first end 420 does not extend beyond the first side surface 120A, and the second end 430 does not extend beyond the second side surface 120B.

[0098] It is understandable that the barrier ring body 122A can penetrate the plate body 121, so that the plate body 121 is divided into two parts by the barrier ring body 122A, and the two parts are insulated and isolated by the barrier ring body 122A and will not be electrically connected. When the battery cell 150A is depressurized or exploded, the strong air pressure will impact the part between the barrier ring 122 and the first through hole 121A on the plate body 121, but will not directly impact the barrier ring body 122A.

[0099] For example, the plate body 121 is divided into a first plate portion 350 and a second plate portion 360 by a blocking ring body 122A. The first plate portion 350 is provided with a mounting hole, and the second plate portion 360 is installed in the mounting hole. A blocking ring 122 is provided between the second plate portion 360 and the inner peripheral wall of the mounting hole, and a first through hole 121A is provided on the second plate portion 360.

[0100] In this way, when some battery cells 150A are out of control, high-temperature and high-pressure substances will be ejected from the pressure relief mechanism 161. The high-temperature and high-pressure substances will first impact the inner wall of the first through hole 121A. After the barrier ring 122 penetrates the board body 121, the current can be limited to the board body 121 between the first through hole 121A and the barrier ring 122, and will not flow to other areas of the board body 121, thereby reducing the probability of failure of other normal battery cells 150A in the battery pack 100 and improving the stability and reliability of the battery pack 100.

[0101] Along the first direction X, the barrier ring body 122A penetrates the plate body 121, and the two ends of the barrier ring body 122A do not exceed the two sides of the plate body 121A, so that when the battery cell 150A is depressurized, the released high-temperature and high-pressure substances impact the first through hole 122A, which will not affect the barrier ring body 122A, and thus will not affect the insulation function of the barrier ring body 122A, thereby ensuring the insulation of the partition plate 120, so as to reduce the risk of the substances released by the thermal runaway battery cell 150A electrically connecting the partition plate 120 and other battery cells 150A, thereby improving safety. Moreover, the stopper 370 is provided on the barrier ring body 122A, which can further reduce the probability of the barrier ring body 122A and the plate body 121 being separated, and improve the stability of the connection between the barrier ring body 122A and the plate body 121.

[0102] Please refer to Figures 1 to 5 In this embodiment, the structural strength of the plate body 121 is greater than the structural strength of the barrier ring 122 .

[0103] The structural strength of the plate body 121 is greater than that of the barrier ring 122 , which can prevent the high-pressure material ejected from the thermal runaway battery cell 150A from damaging the first plate portion 350 or the second plate portion 360 , thereby improving the reliability of the battery pack 100 .

[0104] Please refer to Figures 1 to 7 , Figure 6 The structure of the barrier ring and the plate body according to an embodiment of the present application is shown; Figure 7 An embodiment of the present application is shown in Figure 6In this embodiment, the stopper 370 includes a first stopper 122B, along the first direction X, two ends of the first stopper 122B are connected to the first wall 160 and the first end 420 respectively, and the first stopper 122B protrudes from the first side surface 120A and contacts the first side surface 120A.

[0105] Along the first direction X, the two ends of the first limiting portion 122B are respectively connected to the first wall 160 and the first end 420, that is, one end of the first limiting portion 122B can be connected to the battery cell 150A, and the other end of the first limiting portion 122B can be connected to the blocking ring body 122A, the first side surface 120A faces the battery cell 150A, and the distance between the first side surface 120A and the battery cell 150A is closer than the distance between the second side surface 120B and the battery cell 150A, and the first side surface 120A is arranged in the first chamber 130, and the second side surface 120B is arranged in the second chamber 140.

[0106] The barrier ring 122 includes a barrier ring body 122A and a first limiting portion 122B. It can be understood that the barrier ring body 122A is actually located between the first side surface 120A and the second side surface 120B. The first limiting portion 122B protrudes from the first side surface 120A, and the first limiting portion 122B can extend on the first side surface 120A so that the first limiting portion 122B abuts against the first side surface 120A. The first limiting portion 122B protrudes from the first side surface 120A and contacts the first wall 160. Thus, the first limiting portion 122B can reduce the probability of the first wall 160 contacting the plate body 121, thereby reducing the probability of a short circuit in the battery cell 150A, thereby reducing the probability of a good quality battery cell 150A failing, and improving the stability and reliability of the battery pack 100.

[0107] In some embodiments of the present application, since the first limiting portion 122B protrudes from the first side surface 120A and contacts the first wall 160 , the first wall 160 is spaced apart from the plate body 121 .

[0108] Please refer to Figures 1 to 7 In this embodiment, along the first direction X, the orthographic projection area of ​​the first limiting portion 122B on the first wall 160 is larger than the orthographic projection area of ​​the blocking ring body 122A on the first wall 160 .

[0109] The orthographic projection area of ​​the first limiting portion 122B on the first wall 160 is larger than the orthographic projection area of ​​the blocking ring body 122A on the first wall 160, which can enable the first limiting portion 122B to fully abut against the first side surface 120A, so that the blocking ring 122 and the plate body 121 are more firmly connected, and the probability of the blocking ring 122 and the plate body 121 being separated is reduced, thereby ensuring the insulation between the first plate portion 350 and the second plate portion 360, and improving the stability and reliability of the battery pack 100.

[0110] Please refer to Figures 1 to 7 In this embodiment, the limiting member 370 further includes a second limiting portion 122C, which is disposed at the second end 430 , and the second limiting portion 122C protrudes from the second side surface 120B and contacts the second side surface 120B.

[0111] The second limiting portion 122C may also protrude from the second side surface 120B. The second limiting portion 122C extends in a direction away from the second through hole 123A. The second limiting portion 122C may abut against the second side surface 120B. The connection between the blocking ring 122 and the plate body 121 is more stable, which reduces the risk of connection failure between the two and reduces the probability of failure of the battery pack 100.

[0112] Please refer to Figures 1 to 7 In this embodiment, along the first direction X, the orthographic projection area of ​​the second limiting portion 122C on the first wall 160 is larger than the orthographic projection area of ​​the blocking ring body 122A on the first wall 160 .

[0113] The orthographic projection area of ​​the second limiting portion 122C on the first wall 160 is larger than the orthographic projection area of ​​the blocking ring body 122A on the first wall 160, which can enable the second limiting portion 122C to fully abut against the second side surface 120B, making the connection between the blocking ring 122 and the plate body 121 more firmly, reducing the probability of the blocking ring 122 and the plate body 121 being separated, ensuring the insulation between the first plate portion 350 and the second plate portion 360, and improving the stability and reliability of the battery pack 100.

[0114] Please refer to Figure 8 and Fig. 9 , Figure 8 An embodiment of the present application is shown in Figure 6 Cross-sectional view along the BB direction, Fig. 9The structure of the first limiting groove 460 is shown. In this embodiment, the limiting member 370 includes a third limiting portion 200, which is connected to the first end 420 along the first direction X, and does not extend beyond the first side surface 120A. Along the first direction, the orthographic projection of the blocking ring body 122A on the first wall 160 falls within the orthographic projection of the third limiting portion 200 on the first wall 160. The blocking ring body 122A has a first peripheral surface 440 away from the first through hole 121A, and the third limiting portion 200 protrudes from the first peripheral surface 440. The first plate portion 350 has a first limiting groove 460, which passes through the first side surface 120A, and the third limiting portion 200 is embedded in the first limiting groove 460.

[0115] It can be understood that the blocking ring body 122A is the portion of the blocking ring 122 that does not extend out of the first side 120A and the second side 120B of the blocking plate 120, and the limiting member 370 includes a third limiting portion 200. Along the first direction X, the third limiting portion 200 can be set at the first end 420 of the blocking ring body 122A. Along the first direction X, a part of the orthographic projection of the third limiting portion 200 on the first wall 160 overlaps with the orthographic projection of the blocking ring body 122A on the first wall 160, while another part of the orthographic projection of the third limiting portion 200 on the first wall 160 does not overlap with the orthographic projection of the blocking ring body 122A on the first wall 160. Exemplarily, along the radial direction of the first through hole 121A, the third limiting portion 200 can be clamped in the plate body 121, while the blocking ring body 122A is parallel to the axial direction of the first through hole 121A and is clamped in the plate body 121.

[0116] The blocking ring body 122A has a first circumferential surface 440 facing away from the first through hole 121A. The first circumferential surface 440 is on the side of the blocking ring body 122A away from the first through hole 121A. Along the radial direction of the first through hole 121A, the third limiting portion 200 extends outward. The third limiting portion 200 protrudes from the first circumferential surface 440. The first limiting groove 460 is arranged on the first plate portion 350. Exemplarily, the radial direction of the first through hole 121A is parallel to the radial direction of the first limiting groove 460. The first limiting groove 460 runs through the first side surface 120A. The third limiting portion 200 is embedded in the first limiting groove 460. The third limiting portion 200 may contact the first wall 160, or may not contact the first wall 160.

[0117] The barrier ring body 122A has a first circumferential surface 440 away from the first through hole 121A, the third limiting portion 200 protrudes from the first circumferential surface 440, the first plate portion 350 has a first limiting groove 460, the first limiting groove 460 passes through the first side surface 120A, and the third limiting portion 200 is embedded in the first limiting groove 460. The barrier ring 122 can be firmly embedded in the first plate portion 350, so that the barrier ring 122 is more firmly connected to the plate body 121, reducing the barrier ring 122 and the plate body 121 The separation occurs. The probability is improved, the stability of the connection between the barrier ring 122 and the plate body 121 is improved, and the insulation effect of the partition plate 120 is strengthened. When the battery cell 150A is depressurized, the discharged high-temperature and high-pressure substances impact the first through hole 121A, and will not affect the barrier ring 122, thereby not affecting the insulation function of the barrier ring 122, thereby ensuring the insulation of the partition plate 120, so as to reduce the risk of the substances discharged by the thermal runaway battery cell 150A electrically conducting the partition plate 120 and other battery cells 150A, thereby improving safety.

[0118] Please refer to Fig.10 and Fig.11 , Fig.10 An embodiment of the present application is shown in Figure 6 Cross-sectional view in the BB direction; Fig.11 The structure of the first limiting groove 460 and the second limiting groove 470 is shown. In this embodiment, the limiting member 370 further includes a fourth limiting portion 210, which is spaced apart from the third limiting portion 200 along the first direction X, and the fourth limiting portion 210 is connected to the second end 430, and the fourth limiting portion 210 does not extend beyond the second side surface 120B, the blocking ring body 122A has a second peripheral surface facing the first through hole 121A, the fourth limiting portion 200 protrudes from the second peripheral surface 450, the second plate portion 360 has a third side surface 480 away from the first wall 160, the second plate portion 360 has a second limiting groove 470, the second limiting groove 470 penetrates the third side surface 480, and the fourth limiting portion 210 is embedded in the second limiting groove 470.

[0119] The fourth limiting portion 210 is arranged at the second end 430 of the blocking ring body 122A. For example, along the radial direction of the first through hole 121A, the fourth limiting portion 210 can be clamped in the plate body 121 and parallel to the radial direction of the first through hole 121A, while the blocking ring body 122A is parallel to the axial direction of the first through hole 121A and clamped in the plate body 121.

[0120] Along the first direction X, the fourth limiting portion 210 and the third limiting portion 200 are spaced apart, that is, there is a certain interval between the fourth limiting member 210 and the third limiting member 200, the fourth limiting member 210 is connected to the second end 430, and along the first direction X, the fourth limiting portion 210 does not exceed the second side surface 120B, the second circumferential surface 450 is arranged on the side of the blocking ring body 122A close to the first through hole 121A, and the fourth limiting portion 210 protrudes from the second circumferential surface 450, for example, the fourth limiting portion 210 can protrude toward the first through hole 121A.

[0121] The third side surface 480 is arranged on a side of the second plate portion 360 away from the first wall 160. The second plate portion 360 has a second limiting groove 470. The radial direction of the second limiting groove 470 can be parallel to the radial direction of the first through hole 121A. The fourth limiting portion 210 is embedded in the second limiting groove 470, so that the barrier ring 122 can be more firmly connected to the plate body 121, reducing the probability of the barrier ring 122 and the plate body 121 being separated, and improving the stability of the connection between the barrier ring 122 and the plate body 121, thereby strengthening the insulation effect of the partition plate 120. When the battery cell 150A is depressurized, the released high-temperature and high-pressure substances impact the weak area and will not affect the barrier ring 122, thereby not affecting the insulation function of the barrier ring 122, ensuring the insulation of the partition plate 120, so as to reduce the risk of the substances released by the thermal runaway battery cell 150A electrically conducting the partition plate 120 and other battery cells 150A, thereby improving safety.

[0122] Please refer to Fig.12 and Fig.13 , Fig.12 An embodiment of the present application is shown in Figure 6 Cross-sectional view along the BB direction, Fig.13 The structures of the first limiting groove 460 , the second limiting groove 470 , the third limiting groove 500 and the fourth limiting groove 510 are shown.

[0123] In the embodiment of the present application, the limiting member 370 also includes a fifth limiting portion 220 connected to the second end 430, the fifth limiting portion 220 is connected to the fourth limiting portion 210, along the first direction X, the fifth limiting portion 220 and the third limiting portion 200 are arranged at intervals, the fifth limiting portion 220 protrudes from the first circumferential surface 440, the first plate portion 350 has a third limiting groove 500, the third limiting groove 500 passes through the second side surface 120B, the fifth limiting portion 220 is embedded in the third limiting groove 500, and the limiting member 370 also includes The sixth limiting portion 230 is connected to the first end 420, the sixth limiting portion 230 is connected to the third limiting portion 200, and the sixth limiting portion 230 and the fourth limiting portion 210 are spaced apart along the first direction X. The sixth limiting portion 230 protrudes from the second circumferential surface 450, the second plate portion 360 also has a fourth side surface 490 facing the first wall 160, the second plate portion 360 has a fourth limiting groove 510, the fourth limiting groove 510 passes through the fourth side surface 490, and the sixth limiting portion 220 is embedded in the fourth limiting groove 510.

[0124] Along the first direction X, the fifth limiting portion 220 and the third limiting portion 200 have a certain interval, and the fifth limiting portion 220 protrudes from the first peripheral surface 440, that is, the fifth limiting portion 220 protrudes in a direction away from the first through hole 121A, and the third limiting groove 500 is arranged on the first plate portion 350, and the third limiting groove 500 can pass through the second side surface 120B, and the third limiting groove 500 may not pass through the first side surface 120A, and the radial direction of the third limiting groove 500 can be parallel to the radial direction of the first through hole 121A. The fourth limiting groove 510 can pass through the fourth side surface 490, and the fourth limiting groove 510 may not pass through the third side surface 480.

[0125] Exemplarily, the blocking ring body 122A, the third limiting portion 200, the fourth limiting portion 210, the fifth limiting portion 220 and the sixth limiting portion 230 can together constitute an I-shaped clamped inside the plate body 121, the fifth limiting portion 220 and the fourth limiting portion 210 are connected, and the fifth limiting portion 220 and the fourth limiting portion 210 are arranged at the second end 430 of the blocking ring body 122A, the third limiting portion 200 and the sixth limiting portion 200 are connected, and the third limiting portion 200 and the sixth limiting portion 200 are arranged at the first end 420, thereby the fifth limiting portion 220 and the fourth limiting portion 210 and the third limiting portion 200 and the sixth limiting portion 200 respectively constitute the two ends of the I-shaped clamped inside the plate body 121.

[0126] In this way, the barrier ring 122 can be more firmly connected between the first plate portion 350 and the second plate portion 360, thereby reducing the probability of the barrier ring 122 being detached from the first plate portion 350 and the second plate portion 360, and improving the stability of the connection between the barrier ring 122 and the first plate portion 350 and the second plate portion 360, thereby strengthening the insulation effect of the partition plate 120. When the battery cell 150A is depressurized, the released high-temperature and high-pressure materials impact the weak area and will not affect the barrier ring 122, thereby not affecting the insulation function of the barrier ring 122, thereby ensuring the insulation of the partition plate 120, thereby reducing the risk of the materials released by the thermal runaway battery cell 150A electrically conducting the partition plate 120 and other battery cells 150A, thereby improving safety.

[0127] Please refer to Fig.14 and Fig.15 , Fig.14 An embodiment of the present application is shown in Figure 6 Cross-sectional view along the BB direction, Fig.15 The structure of the first groove 520 and the second groove 530 is shown. The barrier ring body 122A has a first circumferential surface 440 away from the first through hole 121A and a second circumferential surface 450 facing the first through hole 121A, the stopper 370 includes a first protrusion 330, the first protrusion 330 is protruded from the first circumferential surface 440, the first plate portion 350 has a first groove 520, the first protrusion 330 is embedded in the first groove 520, the stopper 370 includes a second protrusion 340, the second protrusion 340 is protruded from the second circumferential surface, and the second plate portion 360 has a second groove 530, the second protrusion 340 is embedded in the second groove 530.

[0128] The first protrusion 330 and the second protrusion 340 are arranged between the first side surface 120A and the second side surface 120B. The first protrusion 330 is protruded on the first peripheral surface 440. The first protrusion 330 is protruded toward the side away from the first through hole 121A, and the second protrusion 340 is protruded toward the side of the first through hole 121A. The first plate portion 350 has a first groove 520, the concave opening of the first groove 520 faces the first through hole 121A, the first protrusion 330 cooperates with the first groove 520, and the first protrusion 330 is embedded in the first groove 520. The second plate portion 360 has a second groove 530, the concave opening of the second groove 530 faces the direction away from the first through hole 121A, the second protrusion 340 cooperates with the second groove 530, and the second protrusion 340 is embedded in the second groove 530.

[0129] In this way, the barrier ring 122 can be more firmly connected to the first plate portion 350 and the second plate portion 360, thereby reducing the probability of the barrier ring 122 being detached from the first plate portion 350 and the second plate portion 360, and improving the stability of the connection between the barrier ring 122 and the first plate portion 350 and the second plate portion 360, thereby strengthening the insulation effect of the partition plate 120. When the battery cell 150A is depressurized, the released high-temperature and high-pressure material impacts the first through hole 121A, and will not affect the barrier ring 122, thereby not affecting the insulation function of the barrier ring 122, thereby ensuring the insulation of the partition plate 120, thereby reducing the risk of the material released by the thermal runaway battery cell 150A electrically connecting the partition plate 120 and other battery cells 150A, thereby improving safety.

[0130] Please refer to Fig.16 and Fig.17 , Fig.16 An embodiment of the present application is shown in Figure 6 Cross-sectional view along the BB direction, Fig.17 The structures of the third groove 540 and the fourth groove 550 are shown.

[0131] The blocking ring body 122A has a first circumferential surface 440 facing away from the first through hole 121A and a second circumferential surface 450 facing the first through hole 121A, the first circumferential surface 440 is provided with a third groove 540 recessed toward the first through hole 121A, the first plate portion 350 has a third protrusion 380, and the third protrusion 380 is embedded in the third groove 540, the second circumferential surface 450 is provided with a fourth groove 550 recessed away from the first through hole 121A, the second plate portion 360 has a fourth protrusion 390, and the fourth protrusion 390 is embedded in the fourth groove 550.

[0132] A third groove 540 is provided on the first circumferential surface 440 and is recessed toward the first through hole 121A, that is, the opening of the third groove 540 is facing in a direction away from the first through hole 121A, and a fourth groove 550 is provided on the second circumferential surface 450 and is recessed away from the first through hole 121A, and the opening of the fourth groove 550 is facing in a direction of the first through hole 122A.

[0133] The first plate portion 350 has a third protrusion 380, which cooperates with the third groove 540 and is embedded in the third groove 540, making the connection between the blocking ring 122 and the first plate portion 350 more secure. The second plate portion 360 has a fourth protrusion 390, which cooperates with the fourth groove 550 and is embedded in the fourth groove 550.

[0134] In this way, the barrier ring 122 can be more firmly connected to the first plate portion 350 and the second plate portion 360, thereby reducing the probability of the barrier ring 122 being detached from the first plate portion 350 and the second plate portion 360, and improving the stability of the connection between the barrier ring 122 and the first plate portion 350 and the second plate portion 360, thereby strengthening the insulation effect of the partition plate 120. When the battery cell 150A is depressurized, the released high-temperature and high-pressure material impacts the first through hole 121A, and will not affect the barrier ring 122, thereby not affecting the insulation function of the barrier ring 122, thereby ensuring the insulation of the partition plate 120, thereby reducing the risk of the material released by the thermal runaway battery cell 150A electrically connecting the partition plate 120 and other battery cells 150A, thereby improving safety.

[0135] Please refer to Figures 1 to 5 In this embodiment, along the first direction X, the positive projection of the pressure relief mechanism 161 on the plate body 121 falls into the first through hole 121A, which can prevent the high-temperature and high-pressure substances released by the thermal runaway battery cell 150A from damaging the barrier ring 122, prevent affecting other normal battery cells 150A, and improve the safety of the battery pack 100.

[0136] Please refer to Figures 1 to 5 In this embodiment, along the first direction X, the orthographic projection of the blocking ring 122 on the first wall 160 surrounds the pressure relief mechanism 161 , and the orthographic projection of the first through hole 121A on the first wall 160 covers the pressure relief mechanism 161 .

[0137] The orthographic projection of the barrier ring 122 on the first wall 160 surrounds the pressure relief mechanism 161, and the orthographic projection of the first through hole 121A on the first wall 160 covers the pressure relief mechanism 161, which can prevent the high-temperature and high-pressure substances released by the thermal runaway battery cell 150A from damaging the barrier ring 122 and affecting other normal battery cells 150A, thereby improving the safety of the battery pack 100.

[0138] Please refer to Figures 1 to 5 In the present embodiment, a plurality of second plate portions 360 and a plurality of barrier rings 122 are provided, and the plurality of second plate portions 360 and the plurality of barrier rings 122 correspond one to one. Each second plate portion 360 is connected to the first plate portion 350 through a corresponding barrier ring 122. Along the first direction X, the first through hole 121A of each second plate portion 360 and the corresponding pressure relief mechanism 161 are arranged relative to each other.

[0139] The battery pack 100 includes a plurality of battery cell groups 150, each battery cell group 150 includes a plurality of battery cells 150A, the plurality of battery cell groups 150 are arranged along the second direction Y, the battery cells 150A in each battery cell group 150 are arranged along the second direction Y, the first direction X, the second direction Y and the third direction Z are perpendicularly intersected in pairs, it can be understood that the arrangement shape of the battery cell groups 150 is roughly rectangular, which can make full use of the internal space of the battery pack 100, improve the space utilization rate inside the battery pack 100, and through such a reasonable arrangement, the risk of short circuit between battery cells 150A and battery cells 150A can be reduced.

[0140] There are multiple second plate portions 360 and barrier rings 122. Along the first direction X, the first through hole 121A of each second plate portion 360 and the corresponding pressure relief mechanism 161 are arranged relatively to each other, so that when each battery cell 150A has a fault such as thermal runaway, the high-temperature and high-pressure material can be sprayed out through the pressure relief mechanism 161, and then enter the second chamber 140 through the first through hole 121A, without affecting the barrier ring 122, thereby not affecting the insulation function of the barrier ring 122, ensuring the insulation of the partition plate 120, so as to reduce the risk of the material released by the thermal runaway battery cell 150A electrically conducting the partition plate 120 and other battery cells 150A, thereby improving safety.

[0141] Please refer to Fig.13 In this embodiment, along the second direction Y, two adjacent barrier rings 122 are connected by the first connecting portion 320 , and the first connecting portion 320 is fixed to the first plate portion 350 .

[0142] The two adjacent barrier rings 122 can be connected through the first connection part 320. The first connection part is an insulating member, which can withstand the impact of high-temperature and high-pressure materials and can block the flow of current. The two adjacent barrier rings 122 are connected through the first connection part 320, which can improve the stability of the connection between the adjacent barrier rings 122 and the first plate part 350 and the second plate part 360, and can make the barrier ring 122 more firmly connected to the first plate part 350 and the second plate part 360, thereby reducing the barrier ring 122 and the first plate part 350 and the second plate part 360. The probability of detachment is improved, the stability of the connection between the barrier ring 122 and the first plate portion 350 and the second plate portion 360 is improved, and the insulation effect of the partition plate 120 is strengthened. When the battery cell 150A is depressurized, the strong air pressure impacts the first through hole 121A, and will not impact the barrier ring 122, thereby not breaking the barrier ring 122, thereby ensuring the insulation of the partition plate 120, reducing the risk of substances released by the thermal runaway battery cell 150A electrically connecting the partition plate 122 and other normal battery cells 150A, and improving safety.

[0143] Please refer to Fig.13In this embodiment, along the second direction Y, the first connection portion 320 and the plurality of barrier rings 122 are integrally formed.

[0144] The first connection portion 320 and the plurality of barrier rings 122 are integrally formed. On the one hand, the integrally formed manner can make the connection between the barrier ring 122 and the first connection portion 320 more stable, and can make the barrier ring 122 more firmly connected to the first plate portion 350 and the second plate portion 360, thereby reducing the probability of the barrier ring 122 being detached from the first plate portion 350 and the second plate portion 360, and improving the stability of the connection between the barrier ring 122 and the first plate portion 350 and the second plate portion 360, thereby strengthening the insulation effect of the partition plate 120. When the battery cell 150A is depressurized, the strong air pressure impacts the first through hole 121A, but does not impact the barrier ring 122, thereby not breaking the barrier ring 122, thereby ensuring the insulation of the partition plate 122, preventing the current of high-temperature and high-pressure substances from flowing to other normal battery cells 151A, reducing the risk of substances released by thermal runaway battery cells electrically connecting the partition plate and other normal battery cells, and improving safety. On the other hand, the one-piece molding method can also reduce the manufacturing cost of the first connecting portion 320 and the barrier ring 122 , thereby reducing the manufacturing cost of the battery pack 100 .

[0145] Please refer to Fig.12 In this embodiment, along the first direction X, the first connection portion 320 passes through one side surface of the first plate portion 350 .

[0146] The first connecting portion 320 passes through one side of the first plate portion 350, so that the barrier ring 122 can be more firmly connected to the first plate portion 350 and the second plate portion 360, thereby reducing the probability of the barrier ring 122 being detached from the first plate portion 350 and the second plate portion 360, and improving the stability of the connection between the barrier ring 122 and the first plate portion 350 and the second plate portion 360, thereby strengthening the insulation effect of the partition plate 120. When the battery cell 150A is depressurized, the strong air pressure impacts the first through hole 121A, and will not impact the barrier ring 122, thereby not breaking the barrier ring 122, thereby ensuring the insulation of the partition plate 120, reducing the risk of the substances released by the thermal runaway battery cell 150A electrically connecting the partition plate 120 and other normal battery cells 150A, and improving safety.

[0147] The embodiments of the present application also provide an electrical device, including a battery pack 100 as described in any one of the embodiments of the present application.

[0148] The electrical equipment proposed in the embodiment of the present application has a first through hole 121A and a pressure relief mechanism 161 arranged opposite to each other along a first direction X. The blocking ring 122 includes a blocking ring body 122A and a limiter 122B. The limiter 370 is configured to limit the blocking ring 122 from being separated from the plate body 121, so that the connection between the blocking ring 122 and the plate body 121 is more stable. The blocking ring 122 can have an insulating effect, maintain the insulation of the partition plate 120, protect the battery cell 150A, and improve the stability and reliability of the electrical equipment.

[0149] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0150] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0151] The above is only 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 modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

[0152] Although the embodiments of the present application have been described in conjunction with 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 are all within the scope defined by the appended claims.

Claims

1. A battery pack (100), the battery pack (100) having a first direction (X), characterized in that: include: A box body (110) defines a receiving space (180); a partition plate (120) disposed in the accommodating space (180) and dividing the accommodating space (180) into a first chamber (130) and a second chamber (140); A plurality of battery cells (150A) are arranged in the first chamber (130), the battery cells (150A) comprising a first wall (160) and a pressure relief mechanism (161), the pressure relief mechanism (161) being arranged on the first wall (160), and the first wall (160) and the pressure relief mechanism (161) both facing the partition plate (120); The partition plate (120) comprises a plate body (121) and a barrier ring (122); the plate body (121) comprises a first plate portion (350) and a second plate portion (360) which are arranged at intervals; along the first direction (X), the first plate portion (350) and the second plate portion (360) are both connected to the first wall (160); the barrier ring (122) is an insulating member; the barrier ring (122) comprises a barrier ring body (122A) and a stopper (370); the barrier ring body (122A) is arranged between the first plate portion (350) and the second plate portion (360); , and surrounds the second plate portion (360), the second plate portion (360) has a first through hole (121A), along the first direction (X), the first through hole (121A) passes through the second plate portion (360) and is arranged opposite to the pressure relief mechanism (161), the limiting member (370) and the blocking ring body (122A) are interconnected, the limiting member (370) can limit the blocking ring body (122A) from being separated from between the first plate portion (350) and the second plate portion (360), and the first direction (X) is parallel to the thickness direction of the plate body (121).

2. The battery pack (100) according to claim 1, characterized in that: Along the first direction (X), the first plate portion (350) has a first side surface (120A) facing the first wall (160) and a second side surface (120B) away from the first wall (160); Along the first direction (X), the blocking ring body (122A) passes through the plate body (121), and the blocking ring body (122A) has a first end (420) facing the first wall (160) and a second end (430) away from the first wall (160), the first end (420) does not exceed the first side surface (120A), and the second end (430) does not exceed the second side surface (120B).

3. The battery pack (100) according to claim 2, characterized in that: The limiting member (370) includes a first limiting portion (122B), and along the first direction (X), two ends of the first limiting portion (122B) are respectively connected to the first wall (160) and the first end (420), and the first limiting portion (122B) protrudes from the first side surface (120A) and contacts the first side surface (120A).

4. The battery pack (100) according to claim 3, characterized in that: Along the first direction (X), the orthographic projection area of ​​the first limiting portion (122B) on the first wall (160) is larger than the orthographic projection area of ​​the blocking ring body (122A) on the first wall (160).

5. The battery pack (100) according to claim 3 or 4, characterized in that: The limiting member (370) further comprises a second limiting portion (122C), wherein the second limiting portion (122C) is connected to the second end (430), and the second limiting portion (122C) protrudes from the second side surface (120B) and contacts the second side surface (120B).

6. The battery pack (100) according to claim 5, characterized in that: Along the first direction (X), the orthographic projection area of ​​the second limiting portion (122C) on the first wall (160) is larger than the orthographic projection area of ​​the blocking ring body (122A) on the first wall (160).

7. The battery pack (100) according to claim 2, characterized in that: The limiting member (370) comprises a third limiting portion (200), and along the first direction (X), the third limiting portion (200) is connected to the first end (420), and the third limiting portion (200) does not exceed the first side surface (120A); The barrier ring body (122A) has a first circumferential surface (440) facing away from the first through hole (121A), the third limiting portion (200) protrudes from the first circumferential surface (440), the first plate portion (350) has a first limiting groove (460), the first limiting groove (460) passes through the first side surface (120A), and the third limiting portion (200) is embedded in the first limiting groove (460).

8. The battery pack (100) according to claim 7, characterized in that: The limiting member (370) further comprises a fourth limiting portion (210), wherein along the first direction (X), the fourth limiting portion (210) is spaced apart from the third limiting portion (200), and the fourth limiting portion (210) is connected to the second end (430), and the fourth limiting portion (210) does not extend beyond the second side surface (120B); The barrier ring body (122A) has a second circumferential surface (450) facing the first through hole (121A), and the fourth limiting portion (200) protrudes from the second circumferential surface (450); The second plate portion (360) has a third side surface (480) away from the first wall (160), the second plate portion (360) has a second limiting groove (470), the second limiting groove (470) passes through the third side surface (480), and the fourth limiting portion (210) is embedded in the second limiting groove (470).

9. The battery pack (100) according to claim 8, characterized in that: The limiting member (370) further comprises a fifth limiting portion (220) connected to the second end (430), the fifth limiting portion (220) being connected to the fourth limiting portion (210), and the fifth limiting portion (220) and the third limiting portion (200) being arranged at intervals along the first direction (X), the fifth limiting portion (220) protruding from the first peripheral surface (440), the first plate portion (350) having a third limiting groove (500), the third limiting groove (500) penetrating the second side surface (120B), and the fifth limiting portion (220) being embedded in the third limiting groove (500); The limiting member (370) also includes a sixth limiting portion (230) connected to the first end (420), the sixth limiting portion (230) is connected to the third limiting portion (200), and along the first direction (X), the sixth limiting portion (230) and the fourth limiting portion (210) are spaced apart, the sixth limiting portion (230) protrudes from the second peripheral surface (450), the second plate portion (360) also has a fourth side surface (490) facing the first wall (160), the second plate portion (360) has a fourth limiting groove (510), the fourth limiting groove (510) passes through the fourth side surface (490), and the sixth limiting portion (220) is embedded in the fourth limiting groove (510).

10. The battery pack (100) according to claim 2, characterized in that: The barrier ring body (122A) has a first circumferential surface (440) facing away from the first through hole (121A) and a second circumferential surface (450) facing the first through hole (121A); The limiting member (370) comprises a first protruding portion (330), the first protruding portion (330) is convexly arranged on the first peripheral surface (440), the first plate portion (350) has a first groove (520), and the first protruding portion (330) is embedded in the first groove (520); The limiting member (370) comprises a second protruding portion (340), the second protruding portion (340) is protruding from the second peripheral surface (450), the second plate portion (360) has a second groove (530), and the second protruding portion (340) is embedded in the second groove (530).

11. The battery pack (100) according to claim 10, characterized in that: The barrier ring body (122A) has a first circumferential surface (440) facing away from the first through hole (121A) and a second circumferential surface (450) facing the first through hole (121A); The first peripheral surface (440) is provided with a third groove (540) which is recessed toward the first through hole (121A); the first plate portion (350) has a third protrusion (380), and the third protrusion (380) is embedded in the third groove (540); The second peripheral surface (450) is provided with a fourth groove (550) which is recessed away from the first through hole (121A); the second plate portion (360) has a fourth protrusion (390), and the fourth protrusion (390) is embedded in the fourth groove (550).

12. The battery pack (100) according to claim 1, characterized in that: Along the first direction (X), the orthographic projection of the pressure relief mechanism (161) on the plate body (121) falls into the first through hole (121A).

13. The battery pack (100) according to claim 12, characterized in that: Along the first direction (X), the orthographic projection of the barrier ring (122) on the first wall (160) is arranged around the pressure relief mechanism (161), and the orthographic projection of the first through hole (121A) on the first wall (160) covers the pressure relief mechanism (161).

14. The battery pack (100) according to claim 1, characterized in that: The second plate portion (360) and the barrier ring (122) are both provided in plurality, and the plurality of second plate portions (360) and the plurality of barrier rings (122) correspond one to one, and each second plate portion (360) is connected to the first plate portion (350) via the corresponding barrier ring (122), and along the first direction (X), the first through hole (121A) of each second plate portion (360) and the corresponding pressure relief mechanism (161) are arranged relative to each other.

15. The battery pack (100) according to claim 14, characterized in that: Along the second direction (Y), two adjacent barrier rings (122) are connected via a first connecting portion (320), and the first connecting portion (320) is fixed to the first plate portion (350).

16. The battery pack (100) according to claim 15, characterized in that: Along the second direction (Y), the first connecting portion (320) and the plurality of barrier rings (122) are integrally formed.

17. The battery pack (100) according to claim 16, characterized in that: Along the first direction (X), the first connecting portion (320) passes through a side surface of the first plate portion (350).

18. The battery pack (100) according to claim 16, characterized in that: The structural strength of the plate body (121) is greater than the structural strength of the barrier ring (122).

19. An electrical equipment, characterized in that: A battery pack (100) comprising any one of claims 1-18.

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