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 battery monomers, 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 monomers are arranged in the first cavity; 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 face the partition plate, the partition plate comprises a first plate part, a blocking ring and a second plate part, the first plate part is provided with a first through hole, the first through hole penetrates through the first plate part in the first direction, and the second plate part is provided with a second through hole; the blocking ring is arranged between the hole wall of the first through hole and the outer circumferential face of the second plate part so as to separate the first plate part from the second plate part, and the blocking ring is configured to be an insulating piece. 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 have explosion-proof valves (which are actually pressure relief mechanisms). The explosion-proof valves face the exhaust area. When the battery cells are thermally 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 thermally runaway, the ejected high-temperature and high-pressure substances can easily destroy the insulating layer on the partition, thereby causing the battery pack to short-circuit. 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, an embodiment of the present application provides a battery pack, which includes a case body, a partition plate and a battery cell, wherein the case 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, 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, the first wall and the pressure relief mechanism are both facing the partition plate, wherein the partition plate includes a first plate portion, a barrier ring and a second plate portion, the first plate portion has a first through hole, the first through hole passes through the first plate portion along a first direction, the second plate portion is fixedly installed in the first through hole, the partition plate fixedly connects the first plate portion and the second plate portion, the second plate portion has a second through hole, the second through hole passes through the second plate portion along the first direction and is arranged opposite to the pressure relief mechanism, the barrier ring is arranged between the hole wall of the first through hole and the outer peripheral surface of the second plate portion to separate the first plate portion and the second plate portion, the barrier ring is constructed as an insulating member, and the first direction is parallel to the thickness direction of the partition plate.

[0006] In the battery pack proposed in the embodiment of the present application, the barrier ring is arranged between the hole wall of the first through hole and the outer peripheral surface of the second plate portion. When the battery cell is out of control, the high-temperature conductive material is ejected from the pressure relief mechanism. Since the pressure relief mechanism is arranged relative to the second through hole, the high-temperature conductive material will contact the second plate portion. The barrier ring is arranged between the second plate portion and the first plate portion, which can block the electrical connection between the first plate portion and the second plate portion, ensure the insulation between the thermal runaway battery cell and other normal battery cells, avoid the thermal runaway battery cell from being connected to the partition plate through the released high-temperature and high-pressure material, so that it is electrically connected to other normal battery cells and cause a short circuit, thereby improving the safety and reliability of the battery pack.

[0007] Optionally, both the first plate portion and the second plate portion are constructed as metal parts.

[0008] The first plate portion and the second plate portion are configured as metal parts, which can make the first plate portion and the second plate portion have higher strength and hardness, and can effectively resist external impact and vibration, thereby protecting the battery cells inside the battery pack from damage and improving the strength and durability of the battery pack structure.

[0009] Optionally, the structural strength of any one of the first plate portion and the second plate portion is greater than the structural strength of the barrier ring.

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

[0011] Optionally, along the first direction, the partition plate 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 includes a blocking ring body and a first limiting portion. The blocking ring body is arranged between the hole wall of the first through hole and the outer peripheral surface of the second plate portion. The first limiting portion protrudes from the first side surface and contacts with the first wall.

[0012] The first limiting portion protrudes from the first side surface and contacts the first wall. The first limiting portion can reduce the probability of the first wall contacting the first plate portion and the second plate portion, thereby reducing the probability of short circuit of the battery cell 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, so that the barrier ring is more firmly connected to the first plate portion and the second plate portion, reducing the probability of the barrier ring being detached from the first plate portion or the second plate portion, ensuring the stability of the insulation between the first plate portion and the second plate portion, thereby improving the stability and reliability of the battery pack.

[0015] Optionally, along the first direction, the barrier ring further includes a second limiting portion, the second limiting portion and the first limiting portion are respectively arranged at two ends of the barrier ring body, and the second limiting portion protrudes from the second side surface.

[0016] The second limiting portion may also protrude from the second side surface. The second limiting portion extends in a direction away from the second through hole. The second limiting portion abuts against the second side surface. The connection between the blocking ring and the first plate portion or the second plate portion is more stable, thereby reducing the risk of failure of the connection between the two and reducing 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 barrier 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 more firmly connected to the first plate portion and the second plate portion, reducing the probability of the barrier ring being detached from the first plate portion or the second plate portion, ensuring the stability of the insulation between the first plate portion and the second plate portion, and improving the stability and reliability of the battery pack.

[0019] Optionally, along the first direction, an orthographic projection of the pressure relief mechanism on the second plate portion falls into the second through hole.

[0020] The orthographic projection of the pressure relief mechanism on the second plate portion falls into the second 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.

[0021] Optionally, along the first direction, an orthographic projection of the barrier ring on the first wall surrounds the pressure relief mechanism, and an orthographic projection of the first through hole on the first wall covers the pressure relief mechanism.

[0022] 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.

[0023] Optionally, the battery pack includes multiple battery cell groups, and the multiple battery cell groups are arranged along a third direction. Each battery cell group includes multiple battery cells arranged along a second direction. The first direction, the second direction and the third direction intersect each other. There are multiple first through holes, barrier rings and second plate portions. The barrier rings are arranged between the hole walls of the corresponding first through holes and the outer peripheral surface of the corresponding second plate portion. Along the first direction, the pressure relief mechanism of each battery cell is arranged opposite to the second through hole of the corresponding second plate portion.

[0024] The pressure relief mechanism of each battery cell is arranged opposite to the second through hole of the corresponding second plate portion. When a battery cell experiences thermal runaway, the high-temperature conductive material can be ejected through the pressure relief mechanism and then enter the second chamber along the second through hole, thereby achieving the discharge of the high-temperature and high-pressure material, ensuring that the high-temperature and high-pressure material is separated from the battery cell in the first chamber, ensuring that other normal battery cells are not affected by the high-temperature and high-pressure material discharged by the thermal runaway battery cell, avoiding the occurrence of a thermal runaway chain reaction and causing heat diffusion, and effectively improving the safety of the battery pack.

[0025] 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.

[0026] In the electrical equipment proposed in the embodiment of the present application, the barrier ring is arranged between the hole wall of the first through hole and the outer peripheral surface of the second plate portion. When the battery cell is out of control, the high-temperature and high-pressure material is ejected from the pressure relief mechanism. Since the pressure relief mechanism is arranged relative to the second through hole, the high-temperature conductive material will contact the second plate portion. The barrier ring is arranged between the second plate portion and the first plate portion, which can block the electrical connection between the first plate portion and the second plate portion, ensure the insulation between the thermal runaway battery cell and other normal battery cells, avoid the thermal runaway battery cell from being connected to the partition plate through the released high-temperature and high-pressure material, so that it is electrically connected to other normal battery cells and cause a short circuit, thereby improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 A schematic diagram of the structure of a battery pack provided in one embodiment of the present application;

[0029] Figure 2 for Figure 1 A top view of

[0030] Figure 3 for Figure 2 Section view in the AA direction;

[0031] Figure 4 for Figure 1 Schematic diagram of the explosion structure;

[0032] Figure 5 The structure of the pressure relief mechanism and the partition is shown;

[0033] Figure 6 The structure of a barrier ring according to an embodiment of the present application is shown.

[0034] [Description of Reference Numerals]

[0035] Battery pack 100; box body 110; partition plate 120; first side 120A; second side 120B; first plate portion 121; first through hole 121A; barrier ring 122; barrier ring body 122A; first limit portion 122B; second limit portion 122C; second plate portion 123; second through hole 123A; 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; first direction X; second direction Y; third direction Z. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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).

[0042] 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 has 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 material ejected from the explosion-proof valve rushes to the exhaust area through the through hole of the partition, reducing the impact of the out-of-control battery cell on the normal battery cell.

[0043] However, in the related art, the high-temperature and high-pressure substances ejected when the battery cell thermally runs away are conductive, which can easily destroy the insulating layer on the partition and contact the partition, thereby causing a short circuit in the battery pack or other electrical components.

[0044] 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.

[0045] The box body defines a accommodating space, a partition plate is arranged in the accommodating space and divides the accommodating space into a first chamber and a second chamber, a 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, the first wall and the pressure relief mechanism are both facing the partition plate, wherein the partition plate includes a first plate portion, a barrier ring and a second plate portion, the first plate portion has a first through hole, the first through hole penetrates the first plate portion along the thickness direction of the partition plate, the second plate portion is fixedly installed in the first through hole, the partition plate fixes the first plate portion and the second plate portion in connection, the second plate portion has a second through hole, the second through hole penetrates the second plate portion along the thickness direction of the partition plate and is arranged opposite to the pressure relief mechanism, the barrier ring is arranged between the hole wall of the first through hole and the outer peripheral surface of the second plate portion to separate the first plate portion and the second plate portion, and the barrier ring is constructed as an insulating member.

[0046] In the above scheme, along the first direction, the second through hole penetrates the second plate portion and is arranged opposite to the pressure relief mechanism. The substance ejected when the battery cell is out of control can be ejected through the second through hole, reducing the probability of normal voltage being destroyed. The barrier ring is arranged between the hole wall of the first through hole and the outer peripheral surface of the second plate portion to separate the first plate portion and the second plate portion. The barrier ring is constructed as an insulating part, which can cut off the conduction between the first plate portion and the second plate portion, reducing the probability of short circuit in the battery pack.

[0047] 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.

[0048] Please refer to Figures 1 to 5 , Figure 1 A schematic diagram of the structure of a battery pack 100 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 161 and the partition plate 120 is shown.

[0049] The embodiment of the present application provides a battery pack 100, which 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, and the first wall 160 and the pressure relief mechanism 161 are both facing the partition plate 120, wherein the partition plate 120 includes a first plate portion 121, a barrier ring 122, and a second plate portion 121. 3. The first plate portion 121 has a first through hole 121A, which passes through the first plate portion 121 along the first direction X. The second plate portion 123 is fixedly installed in the first through hole 121A. The partition plate 120 fixedly connects the first plate portion 121 and the second plate portion 123. The second plate portion 123 has a second through hole 123A, which passes through the second plate portion 123 along the first direction X and is arranged opposite to the pressure relief mechanism 161. The blocking ring 122 is arranged between the hole wall of the first through hole 121A and the outer peripheral surface of the second plate portion 123 to separate the first plate portion 121 from the second plate portion 123. The blocking ring 122 is constructed as an insulating member.

[0050] 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.

[0051] The partition plate 120 includes a first plate portion 121, a barrier ring 122, and a second plate portion 123. The first through hole 121A passes through the first plate portion 121. The first plate portion 121 can be connected to the second plate portion 123 through the barrier ring 122. It can be understood that the second plate portion 123 and the barrier ring 122 are arranged in the first through hole 121A. The second plate portion 123 has a second through hole 123A. The second through hole 123A is actually arranged inside the first through hole 121A. Along the first direction, the second through hole 123A passes through the second plate portion 123. The second through hole 123A 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 material inside the battery cell 150A will be ejected from the pressure relief mechanism 161, and the high-temperature material enters the interior of the second chamber 140 through the second through hole 123A. The blocking ring 122 is arranged between the hole wall of the first through hole 121A and the outer peripheral surface of the second plate portion 123. The blocking ring 122 separates the first plate portion 121 and the second plate portion 123. In fact, the first plate portion 121 and the second plate portion 123 are connected together through the blocking ring 122. The first plate portion 121, the blocking ring 122 and the second plate portion 123 together constitute the partition plate 120.

[0052] Since the partition plate 120 is mostly made of metal material, the partition plate 120 has good electrical and thermal conductivity, and the first plate portion 121 and the second plate portion 123 also have good electrical conductivity. The barrier ring 122 is arranged between the first plate portion 121 and the second plate portion 123, so that the first plate portion 121 and the second plate portion 123 are insulated from each other, and current cannot flow from the first plate portion 121 to the second plate portion 123, and current cannot flow from the second plate portion 123 to the first plate portion 121.

[0053] 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 failure (such as thermal runaway, short circuit, etc.) 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 damaging 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 shock or vibration.

[0054] 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.

[0055] 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 barrier ring 122 is arranged between the hole wall of the first through hole 121A and the outer peripheral surface of the second plate portion 123. 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 second plate portion 123. The barrier ring 122 is arranged between the second plate portion 123 and the first plate portion 121, which can block the electrical connection between the first plate portion 121 and the second plate portion 123, ensure the insulation between the thermal runaway battery cell 150A and other normal battery cells 150A, and avoid the thermal runaway battery cell 150A from being connected to the partition plate 120 through the released high-temperature and high-pressure material, so that it is electrically connected with other normal battery cells 150A and causes a short circuit, thereby improving the safety and reliability of the battery pack 100.

[0056] 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.

[0057] Please refer to Figures 1 to 5 In this embodiment, the first plate portion 121 and the second plate portion 123 are both constructed as metal parts.

[0058] The first plate portion 121 and the second plate portion 123 are set as metal parts, which can make the first plate portion 121 and the second plate portion 123 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 first plate portion 121 and the second plate portion 123 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 setting the first plate portion 121 and the second plate portion 123 as metal parts can also provide the battery pack 100 with an electromagnetic shielding function, 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 metal parts have excellent corrosion resistance, configuring the first plate portion 121 and the second plate portion 123 as metal parts can also extend the service life of the battery pack 100 .

[0059] In some embodiments, the metal piece can be made of metal materials such as stainless steel, magnesium alloy, and aluminum alloy.

[0060] 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.

[0061] 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 .

[0062] Please refer to Figures 1 to 5 In this embodiment, the structural strength of any one of the first plate portion 121 and the second plate portion 123 is greater than the structural strength of the barrier ring 122 .

[0063] The structural strength of either the first plate portion 121 or the second plate portion 123 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 121 or the second plate portion 123 , thereby improving the reliability of the battery pack 100 .

[0064] Please refer to Figure 6 , Figure 6The structure of the barrier ring 122 of one embodiment of the present application is shown. In this embodiment, along the first direction X, the partition plate 120 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 barrier ring 122 includes a barrier ring body 122A and a first limiting portion 122B. The barrier ring body 122A is disposed between the hole wall of the first through hole 121A and the outer peripheral surface of the second plate portion 123. The first limiting portion 122B protrudes from the first side surface 120A and contacts the first wall 160.

[0065] 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. The first side surface 120A is disposed in the first chamber 130, and the second side surface 120B is disposed in the second chamber 140. The barrier ring 122 includes a barrier ring body 122A and a first limiting portion 122B. The barrier ring body 122A is disposed between the hole wall of the first through hole 121A and the outer peripheral surface of the second plate portion 123, that is, the barrier ring body 122A is disposed between the first plate portion 121 and the second plate portion 123. It can be understood that the barrier ring body 122A is actually also 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 first plate portion 121 and the second plate portion 123, thereby reducing the probability of a short circuit in the battery cell 150A, and further reducing the probability of failure of the battery cell 150A with good quality, thereby improving the stability and reliability of the battery pack 100.

[0066] 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 and the first plate portion 121 are spaced apart, and the first wall 160 and the second plate portion 123 are spaced apart.

[0067] Please refer to Figure 6 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 .

[0068] 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 is more firmly connected to the first plate portion 121 and the second plate portion 123, thereby reducing the probability of the blocking ring 122 being detached from the first plate portion 121 or the second plate portion 123, ensuring the stability of the insulation between the first plate portion 121 and the second plate portion 123, thereby improving the stability and reliability of the battery pack 100.

[0069] Please refer to Figure 6 In this embodiment, along the first direction X, the barrier ring 122 further includes a second limiting portion 122C, the second limiting portion 122C and the first limiting portion 122B are respectively arranged at two ends of the barrier ring body 122A, and the second limiting portion 122C protrudes from the second side surface 120B.

[0070] 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 first plate portion 121 or the second plate portion 123 is more stable, thereby reducing the risk of failure of the connection between the two and reducing the probability of failure of the battery pack 100.

[0071] Please refer to Figure 6 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 .

[0072] 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, so that the blocking ring 122 is more firmly connected to the first plate portion 121 and the second plate portion 123, thereby reducing the probability of the blocking ring 122 being separated from the first plate portion 121 or the second plate portion 123, ensuring the stability of the insulation between the first plate portion 121 and the second plate portion 123, and improving the stability and reliability of the battery pack 100.

[0073] Please refer to Figures 1 to 5 In this embodiment, along the first direction X, the orthographic projection of the pressure relief mechanism 161 on the second plate portion 123 falls into the second through hole 123A.

[0074] The out-of-control battery cell 150A can eject high-temperature conductive material through the pressure relief mechanism 161, and then enter the second chamber 140 from the second through hole 123A. The orthographic projection of the pressure relief mechanism 161 on the second plate portion 123 falls into the second through hole 123A, which can prevent the high-temperature and high-pressure material released by the thermal runaway battery cell 150A from damaging the barrier ring 122, prevent it from affecting other normal battery cells 150A, and improve the safety of the battery pack 100.

[0075] 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 .

[0076] 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.

[0077] Please refer to Figures 1 to 5 In the present embodiment, the battery pack 100 includes a plurality of battery cell groups 150, and the plurality of battery cell groups 150 are arranged along the third direction Z. Each battery cell group 150 includes a plurality of battery cells 150A arranged along the second direction Y. The first direction X, the third direction Z and the second direction Y intersect each other. There are a plurality of first through holes 121A, barrier rings 122 and second plate portions 123. The barrier rings 122 are disposed between the hole wall of the corresponding first through hole 121A and the outer peripheral surface of the corresponding second plate portion 123. Along the first direction X, the pressure relief mechanism 161 of each battery cell 150A is disposed opposite to the second through hole 123A of the corresponding second plate portion 123.

[0078] 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 a third direction Z, the battery cells 150A in each battery cell group 150 are arranged along a second direction Y, the first direction X, the third direction Z and the second direction Y 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.

[0079] There are multiple first through holes 121A, barrier rings 122 and second plate portions 123, that is, each battery cell 150A corresponds to a first through hole 121A, a barrier ring 122 and a second plate portion 123, and the pressure relief mechanism 161 of each battery cell 150A is arranged opposite to the second through hole 123A of the second plate portion 123. In this way, when each battery cell 150A has a thermal runaway fault, the high-temperature conductive material can be ejected through the pressure relief mechanism 161, and then enter the second chamber 140 along the second through hole 123A, thereby achieving the discharge of the high-temperature and high-pressure material, ensuring that the high-temperature and high-pressure material is separated from the battery cell 150A in the first chamber 130, ensuring that other normal battery cells 150A are not affected by the high-temperature and high-pressure material released by the thermal runaway battery cell 150A, avoiding the occurrence of a thermal runaway chain reaction and causing heat diffusion, and effectively improving the safety of the battery pack 100.

[0080] 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.

[0081] The barrier ring 122 is arranged between the hole wall of the first through hole 121A and the outer peripheral surface of the second plate portion 123. When the battery cell 150A is out of control, the high-temperature and high-pressure material is ejected from the pressure relief mechanism 161. Since the pressure relief mechanism 161 is arranged opposite to the second through hole 123A, the high-temperature conductive material will contact the second plate portion 123. The barrier ring 122 is arranged between the second plate portion 123 and the first plate portion 121, which can block the electrical connection between the first plate portion 121 and the second plate portion 123, ensure the insulation between the thermal runaway battery cell 150A and other normal battery cells 150, and prevent the thermal runaway battery cell 150A from being connected to the separator plate 122 through the discharged high-temperature and high-pressure material, so that it is electrically connected to other normal battery cells 150A and causes a short circuit, thereby improving the safety of the battery pack 100.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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), 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 battery cell (150A) is disposed in the first chamber (130), the battery cell (150A) comprising a first wall (160) and a pressure relief mechanism (161), the pressure relief mechanism (161) being disposed 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 first plate portion (121), a blocking ring (122) and a second plate portion (123); the first plate portion (121) has a first through hole (121A); along a first direction (X), the first through hole (121A) passes through the first plate portion (121); the second plate portion (123) is fixedly installed in the first through hole (121A); the partition plate (120) fixedly connects the first plate portion (121) and the second plate portion (123); the second plate portion (123) has There is a second through hole (123A), along the first direction (X), the second through hole (123A) passes through the second plate portion (123) and is arranged opposite to the pressure relief mechanism (161), the blocking ring (122) is arranged between the hole wall of the first through hole (121A) and the outer peripheral surface of the second plate portion (123) to separate the first plate portion (121) and the second plate portion (123), the blocking ring (122) is constructed as an insulating part, and the first direction (X) is parallel to the thickness direction of the partition plate (120).

2. The battery pack (100) according to claim 1, characterized in that: The first plate portion (121) and the second plate portion (123) are both constructed as metal parts.

3. The battery pack (100) according to claim 1, characterized in that: Along the first direction (X), the partition plate (120) 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 (122) includes a blocking ring body (122A) and a first limiting portion (122B), the blocking ring body (122A) is arranged between the hole wall of the first through hole (121A) and the outer peripheral surface of the second plate portion (123), and the first limiting portion (122B) protrudes from the first side surface (120A) and contacts the first wall (160).

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 barrier ring body (122A) on the first wall (160).

5. The battery pack (100) according to claim 3, characterized in that: Along the first direction (X), the barrier ring (122) further includes a second limiting portion (122C), the second limiting portion (122C) and the first limiting portion (122B) are respectively arranged at two ends of the barrier ring body (122A), and the second limiting portion (122C) protrudes from 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 1, characterized in that: Along the first direction (X), the orthographic projection of the pressure relief mechanism (161) on the second plate portion (123) falls into the second through hole (123A).

8. The battery pack (100) according to claim 7, characterized in that: Along a first direction (X), an orthographic projection of the barrier ring (122) on the first wall (160) surrounds the pressure relief mechanism (161), and an orthographic projection of the first through hole (121A) on the first wall (160) covers the pressure relief mechanism (161).

9. The battery pack (100) according to claim 1, characterized in that: The battery pack (100) comprises a plurality of battery cell groups (150), the plurality of battery cell groups (150) are arranged along a third direction (Z), each of the battery cell groups (150) comprises a plurality of battery cells (150A) arranged along a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; The first through hole (121A), the blocking ring (122) and the second plate portion (123) are all multiple, and the blocking ring (122) is arranged between the hole wall of the corresponding first through hole (121A) and the outer peripheral surface of the corresponding second plate portion (123). Along the first direction (X), the pressure relief mechanism (161) of each battery cell (150A) is arranged opposite to the second through hole (123A) of the corresponding second plate portion (123).

10. The battery pack (100) according to claim 1 or 2, characterized in that: The structural strength of any one of the first plate portion (121) and the second plate portion (123) is greater than the structural strength of the barrier ring (122).

11. An electrical device, characterized in that: A battery pack (100) comprising any one of claims 1 to 9.

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