Battery cell, battery, and electrical device

Abstract

A battery cell (1), a battery, and an electrical device. The battery cell (1) comprises: a casing (101) containing a cell, a top plate (102) being an electrical conductor; a first pole (104) electrically connected to a first tab, the first pole (104) being arranged on the outer surface of the top plate (102), the first pole (104) being insulated from the top plate (102) by means of a first insulating member (105) provided on the top plate (102), and the first tab being electrically connected to the cell; a second pole (106) electrically connected to a second tab, the second pole (106) being arranged on the outer surface of the top plate (102), the second pole (106) being insulated from the top plate (102) by means of a second insulating member (107) provided on the top plate (102), and the second tab being electrically connected to the cell; and at least one electrical connection assembly provided outside the top plate (102), configured to electrically connect at least one of the first pole (104) and the second pole (106) to the top plate (102) in response to an outward displacement of the top plate (102) when the internal air pressure of the casing reaches or exceeds a pressure threshold. When a certain cell in a battery experiences thermal runaway, the whole battery can continue to supply power to a load.

Description

Battery cell, battery and electric device

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202410426280.6, filed on April 10, 2024, entitled “Battery cell, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of batteries, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0004] Batteries have been increasingly widely used in various industries such as automobiles, which helps to achieve energy saving and emission reduction. A battery can be composed of a plurality of battery cells, each of which contains a battery cell. During use, one or more battery cells in the battery can experience thermal runaway, which can cause the entire battery to stop working.

[0005] SUMMARY

[0006] In view of the above problems, the present disclosure provides a battery cell, a battery and an electric device, which enable the battery to continue working when one or more battery cells in the battery experience thermal runaway.

[0007] In a first aspect, the present disclosure provides a battery cell, comprising: a housing, an interior of the housing containing a battery cell, and a top plate of the housing being an electrical conductor; a first pole post electrically connected with a first tab, the first pole post being disposed on an outer surface of the top plate, the first pole post being insulated from the top plate by a first insulating member disposed on the top plate, and the first tab being electrically connected with the battery cell; a second pole post electrically connected with a second tab, the second pole post being disposed on the outer surface of the top plate, the second pole post being insulated from the top plate by a second insulating member disposed on the top plate, and the second tab being electrically connected with the battery cell; and at least one electrical connection assembly disposed outside the top plate, the at least one electrical connection assembly being configured to electrically connect at least one of the first pole post and the second pole post with the top plate in response to the top plate being displaced outwardly in a case where an internal pressure of the housing reaches or exceeds a pressure threshold.

[0008] In a second aspect, the present disclosure provides a battery comprising the battery cell in the above embodiments.

[0009] In a third aspect, the present disclosure provides an electric device comprising the battery in the above embodiments, the battery being configured to provide electrical energy.

[0010] The above description is merely a summary of the application technical solutions, in order to make the technical means of the application more clearly understood, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0011] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not meant to limit the application. Moreover, in the attached drawings, like reference numerals refer to similar or like components, and wherein:

[0012] FIG. 1 shows a structural schematic diagram of a battery cell according to one embodiment of the present disclosure.

[0013] FIG. 2 shows a structural schematic diagram of a battery cell according to one embodiment of the present disclosure.

[0014] FIG. 3 shows a structural schematic diagram of a battery cell according to one embodiment of the present disclosure.

[0015] FIG. 4 shows a structural schematic diagram of a battery cell according to one embodiment of the present disclosure.

[0016] FIG. 5 shows a structural schematic diagram of a battery cell according to one embodiment of the present disclosure.

[0017] FIG. 6 shows a structural schematic diagram of a battery cell according to one embodiment of the present disclosure.

[0018] The reference numerals in the detailed description are as follows:

[0019] Housing 101

[0020] Top plate 102

[0021] Battery cell 1

[0022] First pole 104

[0023] Second pole 106

[0024] First insulating member 105

[0025] Second insulating member 107

[0026] Thermistor 103

[0027] First thermistor 108

[0028] Second thermistor 109

[0029] First component 110

[0030] Second component 111 DETAILED DESCRIPTION

[0031] The embodiments of the present application will be described below in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot be used to limit the protection scope of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising," "comprises" and "including" as used herein are synonymous with and meant to have the same meaning as the term "including"; the term "comprising" as used herein is meant to be open-ended and include the possibility of one or more additional elements.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0034] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0036] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0037] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0038] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] The battery can be composed of a plurality of (e.g., tens, hundreds) of battery monomers, each battery monomer containing a battery cell, and each battery cell can be discharged and charged individually. During the use of the battery, one or more battery cells in the battery may

[0040] As an example, for example in the use scenario of an electric vehicle, when the vehicle identifies that a certain battery cell has thermal runaway, the tab of the battery cell may be broken. At this time, if the entire battery is kept powered on or powered on afterwards, a reverse high voltage may be formed at the broken tab, causing the battery cell to be punctured, causing the battery to catch fire externally, causing safety problems. In the case where the tab of the battery cell is not broken, if the entire battery is kept powered on or powered on afterwards, the battery cell may overheat and cause a fire. Therefore, once it is identified that a certain battery cell has thermal runaway, the control system of the entire vehicle will take immediate power-off processing to stop the discharge of the entire battery, thereby causing the vehicle to be unable to continue driving. In other use scenarios other than vehicles, similar problems exist.

[0041] To enable the entire battery to continue to supply power to the load in the event of thermal runaway of a certain cell in the battery, the technical solution of the present disclosure is proposed. In the present disclosure, in the event of thermal runaway of a certain cell, the cell can become a resistance in the circuit of the entire battery, and at least part of the discharge current of the cells of the entire battery that have not undergone thermal runaway will continue to supply power to the load via (i.e., flow through) the metal shell of the cell, so that the entire battery can continue to supply power to the load.

[0042] FIG. 1 shows a structural schematic diagram of a battery monomer 1 according to one embodiment of the present disclosure. As shown in FIG. 1, the battery monomer 1 includes a shell 101, a first pole 104, and a second pole 106. The inside of the shell 101 can accommodate a cell (not shown), which is a component capable of discharging and charging.

[0043] The shell 101 can be in any shape as long as its inside can accommodate the cell. As an example, in one embodiment, as shown in FIG. 1, the shell 101 may, for example, be in a generally hexahedral shape. The top plate 102 of the shell 101 is an electrical conductor, i.e., the top plate 102 is made of a conductive material such as metal. In some embodiments, some or all of the other plates of the shell 101 can also be electrical conductors.

[0044] In one embodiment, the first pole 104 and the second pole 106 can be disposed on the outer surface of the top plate 102. In the case of normal operation of the cell, the first pole 104 and the second pole 106 are electrically insulated from the top plate 102, i.e., not electrically connected to the top plate 102.

[0045] The cell can have a first tab and a second tab (not shown), the first tab can be electrically connected to the first pole 104, and the second tab can be electrically connected to the second pole 106. The first tab and the second tab can be connected to the poles through a connecting piece such as a jumper, or can be directly connected to the poles. A through hole (not shown) can be formed in the top plate 102 to facilitate these connections. The first tab and the second tab are both electrically connected to the cell to release the current of the cell to the outside, or to receive the charging current from the outside.

[0046] In one embodiment, the battery monomer 1 can include at least one thermistor 103 having a resistance value that decreases with an increase in temperature, the at least one thermistor 103 being disposed in contact with at least one of the first pole 104 and the second pole 106 and the top plate 102. In the event that the temperature of the at least one thermistor 103 reaches or exceeds a temperature threshold, the at least one pole is electrically connected to the top plate 102 via the at least one thermistor 103.

[0047] The material and type of the thermistor 103 are not limited in any way. For example, in one embodiment, the thermistor 103 can be formed of a material such as a semiconductive ceramic made of oxides of two or more metals such as manganese, copper, silicon, cobalt, iron, nickel, zinc, etc. In addition, the thermistor 103 can also be formed of a non-oxide such as silicon carbide, tin selenide, tantalum nitride, etc.

[0048] The temperature threshold herein is not limited to a specific temperature value, but can be a temperature value adjusted according to the specific use conditions of the battery and the electrical device (e.g., the voltage of the battery, the size of the load, the resistance size of each element in the circuit), the surrounding environmental parameters (e.g., ambient temperature, humidity), etc. In some embodiments, the temperature threshold can correspond to the temperature that the top plate 102 of the shell 101 will reach when the cell undergoes thermal runaway, for example, about 300 degrees Celsius. Those skilled in the art can adjust the threshold temperature according to the specific implementation when implementing the technical solutions of the present disclosure, and select the type and / or material of the thermistor that is suitable for the required threshold temperature to achieve the expected thermal runaway response measure.

[0049] Due to the adoption of the at least one thermistor 103 described above, in the case of thermal runaway of the cell, the temperature of the top plate 102 of the shell 101 will rise to or exceed the threshold temperature, so that the resistance value of the thermistor 103 decreases to be small enough with the temperature rise, so that the at least one pole is in contact with the at least one thermistor 103. The at least one pole is electrically connected to the top plate 102 via the at least one thermistor 103. Since the pole and the top plate 102 are electrically connected at this time, and the pole is electrically connected to the pole of one or more cells of the entire battery that have not undergone thermal runaway, at least a part of the discharge current of the cells that have not undergone thermal runaway will continue to supply power to the load via the top plate 102 of the cell (i.e., the cell that has undergone thermal runaway) of the battery monomer 1, so that the entire battery can continue to supply power to the load.

[0050] The electrical connection between the pole and the top plate 102 described above, which is achieved in the case of thermal runaway of the cell, is different from the conventional electrical connection achieved by metal contact, but is achieved by the thermistor 103 when its resistance value is reduced to be small enough. The specific resistance value required for the thermistor 103 to achieve such an electrical connection is not limited in any way, but can be varied or adjusted according to the specific circuit conditions, load conditions, and environmental conditions, etc.

[0051] In one embodiment, as shown in FIG. 1, the battery cell 1 includes only one thermistor 103, which is in contact with, for example, the first pole 104, and the second pole 106 is insulated from the top plate 102 via the first insulating member 105. In this embodiment, in the case where the thermal runaway occurs in the electrode group of the battery cell 1, so that the temperature of the thermistor 103 reaches or exceeds the temperature threshold, the second pole 106 can be electrically connected to the top plate 102 via the electrode group (e.g., via the active material in the electrode group).

[0052] In one embodiment, in the case where the temperature of the electrode group reaches or exceeds the temperature threshold, the electrode group can be electrically connected to the top plate 102. As the electrode group is electrically connected to the top plate 102, so that the second pole 106 can be electrically connected to the top plate 102 via the electrode group.

[0053] In one embodiment, an isolation member (not shown) can be provided between the electrode group of the battery cell 1 and the top plate 102, which insulates the electrode group from the top plate 102. For example, the isolation member can be formed of a material such as a non-conductive plastic film, resin, foam, or a thermistor whose resistance value decreases as the temperature increases, or a semiconductor element whose electrical conductivity changes with temperature.

[0054] As the isolation member is provided, in the case where the electrode group is normally operating, the electrode group can be insulated from the top plate 102.

[0055] In one embodiment, in the case where the temperature of the electrode group reaches or exceeds the temperature threshold, at least a portion of the isolation member can be melted (e.g., in the case where the isolation member is formed of a non-conductive plastic film, resin, foam, etc.) or turned on (e.g., in the case where the isolation member is formed of a thermistor or a semiconductor element), so that the electrode group is electrically connected to the top plate 102. In this embodiment, in the case where the thermal runaway occurs in the electrode group of the battery cell 1, so that the temperature of the electrode group reaches or exceeds the temperature threshold, the second pole 106 can be electrically connected to the top plate 102 via the electrode group. Thus, in the case where both the temperature of the thermistor 103 and the temperature of the electrode group are high enough, both the first pole 104 and the second pole 106 can be electrically connected to the top plate 102, and thus at least a portion of the discharge current of the other electrode groups of the battery which do not undergo thermal runaway will continue to supply power to the load via the top plate 102 of the electrode group (i.e., the electrode group which undergoes thermal runaway) of this battery cell 1, so that the entire battery can continue to supply power to the load.

[0056] The first pole 104 can be a positive pole or a negative pole, and correspondingly, the second pole 106 can be a negative pole or a positive pole.

[0057] In one embodiment, the first pole 104 is a positive pole, and the second pole 106 is a negative pole.

[0058] FIG. 2 shows a structural schematic diagram of the battery cell 1 according to one embodiment of the present disclosure. In this embodiment, the battery cell 1 includes two thermistors 103, i.e., two thermistors 103 in contact with the first pole 104 and the second pole 106 respectively. In one embodiment, in the case that the temperature of the two thermistors 103 reaches or exceeds a temperature threshold, the first pole 104 and the second pole 106 are respectively electrically connected to each other via the top plate 102 via a respective one of the two thermistors 103.

[0059] In this embodiment, no insulating member can be provided between the second pole 106 and the top plate 102. Since the above-mentioned two thermistors 103 are adopted in this embodiment, in the case that the battery cell is in thermal runaway, the temperature of the top plate 102 of the shell 101 will rise to or exceed the threshold temperature, so that the resistance value of the thermistor 103 decreases with the temperature rise to be small enough, so that the first pole 104 and the second pole 106 in contact with the two thermistors 103 are respectively electrically connected to each other via the thermistor 103 and the top plate 102. Since the electrical connection of the first pole 104 and the second pole 106 to the top plate 102 is achieved at this time, and the first pole 104 and the second pole 106 are electrically connected to the respective poles of one or more battery cells of the entire battery which do not occur thermal runaway, at least part of the discharge current of the battery cell which does not occur thermal runaway will continue to power the load via the top plate 102 of the battery cell (i.e., the battery cell in thermal runaway) of the battery cell 1, so that the entire battery can continue to power the load.

[0060] In the embodiments shown in FIG. 1 or FIG. 2, for example, one or two thermistors 103 can be clamped between the first pole 104 and / or the second pole 106 and the top plate 102.

[0061] However, the thermistor 103 can also not be clamped between the first pole 104 and / or the second pole 106 and the top plate 102. For example, as shown in FIG. 3, a part of the thermistor 103 can be in contact with the pole, and another part can be in contact with the top plate 102.

[0062] Specifically, FIG. 3 shows a structural schematic diagram of the battery cell 1 according to one embodiment of the present disclosure. As shown in FIG. 3, a first insulating member 105 can be provided between the second pole 106 and the top plate 102, so that the second pole 106 is insulated from the top plate 102 via the first insulating member 105. In addition, a second insulating member 107 can be provided between the first pole 104 and the top plate 102, so that the first pole 104 is insulated from the top plate 102 via the second insulating member 107. In addition, the thermistor 103 can be provided, so that a part of the thermistor 103 contacts the first pole 104, and another part of the thermistor 103 contacts the top plate 102.

[0063] In this embodiment, a portion of the thermistor 103 contacts the first pole 104 on the side of the first pole 104. However, the present disclosure is not limited thereto, and for example, a portion of the thermistor 103 can contact the first pole 104 on the bottom surface or the top surface of the first pole 104, as long as a portion thereof contacts the first pole 104 and another portion thereof contacts the top plate 102. Thus, the electrical connection of the first pole 104 and the top plate 102 can be achieved when the temperature of the thermistor 103 reaches or exceeds the temperature threshold, without being sandwiched between the first pole 104 and / or the second pole 106 and the top plate 102.

[0064] In this embodiment, an isolation element (not shown) can be provided between the cell of the battery cell 1 and the top plate 102, which insulates the cell and the top plate 102 from each other. Due to the provision of the isolation element, the cell and the top plate 102 can be insulated from each other when the cell is normally operating. In addition, at least a portion of the isolation element can be melted or made conductive when the temperature of the cell reaches or exceeds the temperature threshold, so that the cell and the top plate 102 are electrically connected. At this time, the second pole 106 can be electrically connected to the top plate 102 via the cell.

[0065] FIG. 4 shows a structural schematic view of the battery cell 1 according to one embodiment of the present disclosure. In this embodiment, two thermistors, i.e., a first thermistor 108 and a second thermistor 109, are provided. The first pole 104 is insulated from the top plate 102 via the second insulating member 107, and the second pole 106 is insulated from the top plate 102 via the first insulating member 105. A portion of the first thermistor 108 contacts the first pole 104, and another portion of the first thermistor 108 contacts the top plate 102. A portion of the second thermistor 109 contacts the second pole 106, and another portion of the second thermistor 109 contacts the top plate 102.

[0066] Thus, the electrical connection of the first pole 104 and the second pole 106 and the top plate 102 can be achieved when the temperatures of the first thermistor 108 and the second thermistor 109 reach or exceed the temperature threshold, without being sandwiched between the first pole 104 and / or the second pole 106 and the top plate 102.

[0067] In the above, two thermistors that respectively contact the first pole 104 and the second pole 106 are provided. However, only one thermistor can be provided, a first portion of which contacts the first pole 104, a second portion of which contacts the second pole 106, and a third portion of which contacts the top plate 102. In this way, the same technical effects as the above-described embodiments can also be achieved.

[0068] In another embodiment, in order to achieve the connection of the pole to the top plate in the case of thermal runaway of the battery cell, a lock structure can also be provided instead of the thermistor. Alternatively, in still another embodiment, both the lock structure and the thermistor can be provided.

[0069] FIG. 5 illustrates a structural schematic of a battery cell 1 according to one embodiment of the present disclosure. As shown in FIG. 5, the battery cell 1 includes a housing 101, a first pole 104, and a second pole 106. The inside of the housing 101 can accommodate a battery cell (not shown), which is a component capable of discharging and charging.

[0070] The housing 101 can be in any shape as long as the inside thereof can accommodate the battery cell. As an example, in one embodiment, as shown in FIG. 5, the housing 101 can be in a substantially hexahedral shape, for example. The top plate 102 of the housing 101 is an electrical conductor, i.e., the top plate 102 is made of an electrically conductive material such as metal. In some embodiments, some or all of the other plates of the housing 101 can also be electrical conductors.

[0071] In one embodiment, the first pole 104 and the second pole 106 can be provided on the outer surface of the top plate 102. The first pole 104 is insulated from the top plate 102 by a first insulating member 105 provided on the top plate 102, and the second pole 106 is insulated from the top plate 102 by a second insulating member 107 provided on the top plate 102.

[0072] The battery cell can have a first tab and a second tab (not shown), which can be electrically connected to the first pole 104 and the second pole 106, respectively. The first tab and the second tab can be connected to the poles by a connecting member such as a jumper, or can be directly connected to the poles. A through-hole (not shown) can be formed in the top plate 102 to facilitate these connections. The first tab and the second tab are both electrically connected to the battery cell to release the current of the battery cell to the outside, or to receive a charging current from the outside.

[0073] As shown in FIG. 5, the battery cell 1 can further include at least one electrical connection assembly provided outside the top plate 102, which is configured to electrically connect at least one of the first pole 104 and the second pole 106 to the top plate 102 in response to the outward displacement of the top plate 102 in the case where the internal pressure of the housing 101 reaches or exceeds a pressure threshold.

[0074] In the case that the electric cells are working normally, the internal pressure of the casing 101 is lower than the pressure threshold, at which time the electric connection assembly remains in the disengaged state, so that the first pole 104 and the second pole 106 are both electrically separated from the top plate 102. In the case that the electric cells of the battery cell 1 are in thermal runaway, the internal pressure of the casing 101 will increase. Due to the provision of the at least one electric connection assembly, in the case that the internal pressure of the casing 101 increases to the pressure threshold, the electric connection assembly will become in the locked state or in the state of contacting each other, so that at least one pole (for example, the first pole 104) and the top plate 102 become in the electrically connected state. Since the electric connection between the at least one pole and the top plate 102 is achieved at this time, and the at least one pole is electrically connected with the corresponding pole of one or more electric cells of the electric cells of the battery that are not in thermal runaway, at least a part of the discharge current of the electric cells not in thermal runaway will continue to supply power to the load via the top plate 102 of the electric cells (i.e., the electric cells in thermal runaway) of the battery cell 1, so that the entire battery can continue to supply power to the load.

[0075] In one embodiment, as shown in FIG. 5, the battery cell 1 includes only one electric connection assembly, which is in contact with, for example, the first pole 104. In this embodiment, in the case that the electric cells of the battery cell 1 are in thermal runaway, so that the internal pressure of the casing 101 reaches or exceeds the pressure threshold, the second pole 106 can be electrically connected with each other via the electric cells and the top plate 102.

[0076] In one embodiment, since the internal pressure of the casing 101 increases due to the thermal runaway of the electric cells, the temperature of the electric cells will increase synchronously with the increase of the internal pressure of the casing 101. Therefore, in the case that the internal pressure of the casing 101 reaches or exceeds the pressure threshold, the temperature of the electric cells also reaches or exceeds a certain temperature threshold. Thus, the electric cells can be configured to be electrically connected with the top plate 102 at this time. Since the electric cells are electrically connected with the top plate 102, so that the second pole 106 can be electrically connected with each other via the electric cells and the top plate 102.

[0077] In one embodiment, an isolation element (not shown) can be provided between the electric cells of the battery cell 1 and the top plate 102, which insulates the electric cells and the top plate 102 from each other. For example, the isolation element can be formed of a material such as a non-conductive plastic film, resin, foam, or a thermistor whose resistance decreases with the increase of temperature, or a semiconductor element whose conductivity changes with temperature.

[0078] Due to the provision of the isolation element, in the case that the electric cells are working normally, the electric cells can be insulated from each other and the top plate 102.

[0079] In one embodiment, in the case where the internal air pressure of the casing 101 reaches or exceeds the pressure threshold, the temperature of the electric cell also reaches or exceeds a certain temperature threshold. At this time, at least a part of the isolation element can be melted (for example, in the case where the isolation element is formed of a material such as a non-conductive plastic film, resin, foam, etc.) or be conducted (for example, in the case where the isolation element is formed of a thermistor or a semiconductor element), so that the electric cell (for example, via the active material inside the electric cell) is electrically connected with the top plate 102. In this case, the second pole 106 can be electrically connected with the top plate 102 via the electric cell. Thus, in the case where the internal air pressure of the casing 101 reaches or exceeds the pressure threshold, the first pole 104 and the second pole 106 can both be electrically connected with the top plate 102, and thus at least a part of the discharge current of the other electric cells of the battery which do not undergo thermal runaway will continue to supply power to the load via the top plate 102 of the electric cell (i.e., the electric cell undergoing thermal runaway) of the battery monomer 1, so that the entire battery can continue to supply power to the load.

[0080] The first pole 104 can be a positive pole or a negative pole, and correspondingly, the second pole 106 can be a negative pole or a positive pole.

[0081] In one embodiment, the first pole 104 is a positive pole, and the second pole 106 is a negative pole.

[0082] In each of the above embodiments, the electric connection assembly can adopt any form, shape or structure. For example, as shown in FIG. 5, the electric connection assembly can adopt a hook-like interlocking structure. However, this is merely an example, and the electric connection assembly can also adopt any electric contact mode such as a buckle structure, a direct contact structure, a spring or spring sheet abutting structure, etc. For example, one of the electric connection assemblies can be in the form of a spring or spring sheet which elastically presses against the other assembly when the relative distance between the two assemblies becomes small. Obviously, the specific implementation of the electric connection assembly is not subject to any limitation, as long as at least one of the first pole 104 and the second pole 106 is electrically connected with the top plate 102 in response to the outward displacement of the top plate 102 in the case where the internal air pressure of the casing 101 reaches or exceeds the pressure threshold.

[0083] In one embodiment, the at least one electric connection assembly includes a first component 110 and a second component 111 which are electrically separated from each other, the first component 110 is engaged with and electrically connected with the at least one pole (for example, the first pole 104), and the second component 111 is engaged with and electrically connected with the outer surface of the top plate 102.

[0084] In one embodiment, the rigidity of the top plate 102 at the first position (i.e., the position of the top plate 102 in contact with the first insulating member 105 below the first pole 104) near the at least one pole (e.g., the first pole 104) is greater than the rigidity of the top plate 102 at the second position where the second component 111 is engaged with the top plate 102. As the rigidity of the top plate 102 at the first position is greater than the rigidity at the second position, when the internal air pressure of the housing 102 increases, the displacement of the second component 111 outward (i.e., upward in FIG. 5) will be greater than the displacement of the first component 110 outward, thereby enabling the electrical contact of the second component 111 with the first component 110.

[0085] In one embodiment, the rigidity of the top plate 102 at the first position can be made greater than the rigidity at the second position by making the material, thickness, or processing technique of the top plate 102 different at the first position and the second position. In one embodiment, the rigidity of the top plate 102 at the first position is made greater than the rigidity at the second position due to the provision of the first pole 104 at the first position (e.g., by a process such as riveting).

[0086] In one embodiment, the thickness of the top plate 102 at the first position is greater than the thickness of the top plate 102 at the second position. Thereby, the rigidity of the top plate 102 at the first position is made greater than the rigidity at the second position.

[0087] In one embodiment, two electrical connection assemblies can be provided. As shown in FIG. 6, the battery cell 1 includes two electrical connection assemblies configured to electrically connect the first pole 104 and the second pole 106 with the top plate 102, respectively, in the event that the internal air pressure of the housing 101 reaches or exceeds the pressure threshold.

[0088] According to some embodiments of the present disclosure, a battery cell is also provided, including any of the above arrangements.

[0089] According to some embodiments of the present disclosure, a battery is also provided, including any of the above arrangements.

[0090] The battery can be any device or system that uses or is installed with a battery.

[0091] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing, wherein the interior of the housing contains the battery cell, and the top plate of the housing is an electrical conductor; a first pole electrically connected to a first tab, the first pole being disposed on an outer surface of the top plate, the first pole being insulated from the top plate by a first insulating member disposed on the top plate, and the first tab being electrically connected to the battery cell; a second pole electrically connected to the second tab, the second pole being disposed on an outer surface of the top plate, the second pole being insulated from the top plate by a second insulating member disposed on the top plate, and the second tab being electrically connected to the battery cell; an isolation element, the isolation element being located between the battery cell and the top plate and isolating the battery cell and the top plate from each other; as well as At least one electrical connection component is disposed on the outside of the top plate, and the at least one electrical connection component is configured to electrically connect at least one of the first pole and the second pole to the top plate in response to the top plate being displaced outward when the internal gas pressure of the shell reaches or exceeds a pressure threshold.

2. The battery cell according to claim 1, wherein: The at least one electrical connection assembly includes a first component and a second component that are electrically separated from each other, the first component being engaged with and electrically connected to the at least one pole, and the second component being engaged with and electrically connected to the outer surface of the top plate.

3. The battery cell according to claim 2, wherein: The stiffness of the top plate at a first location proximate the at least one pole is greater than the stiffness of the top plate at a second location where a second component engages the top plate.

4. The battery cell according to claim 2, wherein: The thickness of the top plate at the first position is greater than the thickness of the top plate at the second position.

5. The battery cell according to claim 2, wherein: The at least one electrical connection assembly includes two electrical connection assemblies, and the two electrical connection assemblies are configured to electrically connect the first pole and the second pole to the top plate respectively when the internal gas pressure of the housing reaches or exceeds the pressure threshold.

6. The battery cell according to claim 2, wherein: The at least one electrical connection assembly includes only one electrical connection assembly, and The electrical connection assembly is configured to electrically connect one of the first and second poles to the top plate when the internal air pressure of the shell reaches or exceeds the pressure threshold, and the other of the first and second poles is electrically connected to the top plate via the battery cell, wherein, when the internal air pressure of the shell reaches or exceeds the pressure threshold, at least a portion of the isolation element is melted or conducted, so that the battery cell is electrically connected to the top plate.

7. The battery cell according to claim 6, wherein: The one pole is a positive pole.

8. A battery, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 7.

9. An electrical device, characterized in that: The battery according to claim 11 is included for providing electrical energy.

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