Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device, the battery device comprises at least one battery monomer column and a sampling assembly, and the battery monomer column comprises a plurality of battery monomers arranged along a first direction. The battery monomer comprises a shell, a sealing element, a pressure relief mechanism and two electrode terminals, the shell comprises a first wall, a liquid injection hole is formed in the first wall, the sealing element seals the liquid injection hole, the pressure relief mechanism and the two electrode terminals are arranged on the first wall, the two electrode terminals are arranged at intervals in the second direction, and the pressure relief mechanism is located between the two electrode terminals. The first wall includes a shoulder region located outside the two electrode terminals in the second direction. The sampling assembly is arranged in the shoulder area and used for collecting voltage information and / or temperature information of the single battery column. In a projection plane perpendicular to the third direction, the orthographic projection of the sampling assembly is not overlapped with the orthographic projection of the pressure relief mechanism and the orthographic projection of the sealing element. The thermal runaway risk of the battery device can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and more specifically, to a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmental protection advantages. For electric vehicles, the battery device is an important factor related to their development.

[0003] Currently, how to reduce the risk of thermal runaway of battery devices has always been a research topic. Summary of the Utility Model

[0004] This application provides a battery device and an electrical device to reduce the risk of thermal runaway.

[0005] In a first aspect, an embodiment of this application provides a battery device, including: at least one battery cell column, the battery cell column including a plurality of battery cells arranged in a first direction; each battery cell includes a housing, a seal, a pressure relief mechanism, and two electrode terminals. The housing includes a first wall, and the first wall is provided with a liquid injection hole. The seal seals the liquid injection hole. The pressure relief mechanism and the two electrode terminals are both arranged on the first wall. The two electrode terminals are spaced apart in a second direction, and the pressure relief mechanism is located between the two electrode terminals. The first wall includes a shoulder region located outside the two electrode terminals along the second direction. A sampling assembly is arranged in the shoulder region for collecting voltage information and / or temperature information of the battery cell column. In a projection plane perpendicular to a third direction, the orthographic projection of the sampling assembly does not overlap with the orthographic projection of the pressure relief mechanism and the orthographic projection of the seal. The first direction, the second direction, and the third direction are perpendicular to each other pairwise.

[0006] By arranging the sampling assembly in the shoulder region of the first wall of the battery cell, which is outside the electrode terminals, in a projection plane perpendicular to the third direction, the orthographic projection of the sampling assembly does not overlap with the orthographic projection of the pressure relief mechanism, enabling the sampling assembly to avoid the pressure relief mechanism and providing more exhaust space for the pressure relief mechanism, significantly reducing the risk of thermal runaway. For relatively narrow battery cells, even without changing the size of the sampling assembly, it can avoid the pressure relief mechanism, not only reducing the risk of thermal runaway but also reducing the replacement cost of the sampling assembly. In addition, the temperature sampling points of the sampling assembly are no longer restricted, which is beneficial to the thermal management of the battery cell, thereby further reducing the risk of thermal runaway.

[0007] In some embodiments, the number of the battery cell columns is multiple, and the multiple battery cell columns are arranged in the second direction; the sampling assembly is arranged in the adjacent shoulder regions of two adjacent battery cell columns.

[0008] By arranging the sampling component in the adjacent shoulder regions of two adjacent rows of battery cells, the support area of the sampling component can be increased, the connection reliability of the sampling component can be improved, and thus the sampling reliability can be improved.

[0009] In some embodiments, the sampling component includes a circuit board and a temperature acquisition component. The temperature acquisition component is connected to the circuit board and is used to acquire the temperature information of the row of battery cells. The temperature acquisition component is connected to the shoulder region.

[0010] By connecting the temperature acquisition component to the shoulder region without interfering with the components (such as a pressure relief mechanism, a sealing nail, etc.) in the inner region of the two electrode terminals along the second direction of the first wall, the temperature information of the battery cell can be acquired more accurately, which is beneficial to the thermal management of the battery cell, and thus further reduces the risk of thermal runaway.

[0011] In some embodiments, the sampling component further includes a heat-conducting pad. The heat-conducting pad connects the temperature acquisition component and the shoulder region.

[0012] By connecting the temperature acquisition component and the shoulder region with the heat-conducting pad, the heat-conducting pad can play a role in heat conduction and insulation to a certain extent, and improve the accuracy and reliability of temperature acquisition.

[0013] In some embodiments, one of the two electrode terminals is a positive electrode terminal and the other is a negative electrode terminal. The sealing member is located between the positive electrode terminal and the pressure relief mechanism.

[0014] Since the temperature acquisition component is located in the shoulder region and avoids the sealing member, even when the sealing member is located between the positive electrode terminal and the pressure relief mechanism, the temperature information near the positive electrode terminal of the battery cell can be accurately acquired, which is beneficial to the thermal management of the battery cell, and thus further reduces the risk of thermal runaway. In the related art, the sampling component is arranged at the middle position of the row of battery cells. When the sealing member is located between the positive electrode terminal and the pressure relief mechanism, if the temperature near the positive electrode terminal is acquired, the sealing member interferes with the temperature acquisition component, affecting the acquisition accuracy and being unfavorable for the thermal management of the battery cell.

[0015] In some embodiments, in the battery cell connected with the temperature acquisition component, the positive electrode terminal is closer to the temperature acquisition component than the negative electrode terminal or the negative electrode terminal is closer to the temperature acquisition component than the positive electrode terminal.

[0016] The temperature acquisition component is located in the shoulder area of the battery cell closer to the positive terminal, not interfered by the seal, and can accurately acquire the temperature information near the positive terminal, which is beneficial to the thermal management of the battery cell. The temperature acquisition component is located in the shoulder area of the battery cell closer to the negative terminal, not interfered by the seal, and can accurately acquire the temperature information near the negative terminal, which is beneficial to the thermal management of the battery cell.

[0017] In some embodiments, the battery device further includes: a busbar component, in the battery cell array, the electrode terminals of multiple battery cells are connected through the busbar component; a support plate, a part of the support plate is located between the shoulder area and the busbar component, and the support plate is made of insulating material; the circuit board is connected to the side of the support plate facing away from the battery cell.

[0018] By connecting the circuit board to the side of the support plate facing away from the battery cell, the connection stability of the sampling component can be improved.

[0019] In some embodiments, the sampling component further includes a voltage acquisition component connected to the circuit board, and the voltage acquisition component is connected to the busbar component for acquiring the voltage information of the battery cell array.

[0020] By connecting the voltage acquisition component to the busbar component, the voltage information of the battery cell can be detected, which is beneficial to better manage the battery cell, thereby further reducing the risk of thermal runaway.

[0021] In some embodiments, the size of the battery cell along the second direction is less than or equal to 50 mm.

[0022] When the size of the battery cell along the second direction is less than or equal to 50 mm and the width of the battery cell is relatively narrow, in the traditional way of arranging the sampling component in the middle area of the battery cell array, the exhaust space provided for the pressure relief mechanism on the first wall is smaller, and the gas inside the battery cell is more difficult to be discharged to the outside through the pressure relief mechanism, further increasing the probability of the risk of thermal runaway. By arranging the sampling component in the shoulder area of the battery cell outside the electrode terminal, when the width of the battery cell is relatively narrow, without changing the size of the sampling component to avoid the pressure relief mechanism, while reducing the risk of thermal runaway, the replacement cost of the sampling component can also be reduced.

[0023] In a second aspect, an electrical device provided by an embodiment of the present application includes the battery device according to any one of the embodiments of the first aspect.

[0024] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are hereinafter specifically exemplified. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0027] Figure 2 Explosion schematic diagram of a battery device provided by some embodiments of the present application;

[0028] Figure 3 Explosion schematic diagram of a battery cell provided by some embodiments of the present application;

[0029] Figure 4 Arrangement relationship schematic diagram of a sampling component and a battery cell row provided by some embodiments of the present application;

[0030] Figure 5 Structural schematic diagram of a battery cell row provided by some embodiments of the present application;

[0031] Figure 6 Structural schematic diagram of a sampling component provided by some embodiments of the present application;

[0032] Figure 7 Structural schematic diagram of a support plate provided by some embodiments of the present application.

[0033] Icon:

[0034] 1000 - Vehicle; 100 - Battery device; 200 - Controller; 300 - Motor; 10 - Box body; 11 - First sub - box body; 12 - Second sub - box body; 20 - Battery cell; 21 - Outer shell; 211 - Housing; 212 - End cover; 22 - Electrode assembly; 222 - Tab; 20a - Battery cell row; 23 - Electrode terminal; 231 - Positive terminal; 232 - Negative terminal; 24 - Pressure relief mechanism; 213 - First wall; 213a - Shoulder area; 25 - Seal; 30 - Sampling component; 31 - Circuit board; 32 - Temperature acquisition component; 33 - Voltage acquisition component; 34 - Connector; 40 - Busbar component; 50 - Support plate; 51 - Third through - hole; 52 - Second through - hole; 53 - Rivet; 54 - First through - hole. Detailed Embodiments

[0035] The following further describes the embodiments of the present application in conjunction with the accompanying drawings and embodiments. The detailed descriptions and drawings of the following embodiments are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification of this application are intended to cover non-exclusive inclusion.

[0037] The terms "first", "second", etc. in the specification of this application are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0038] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in this application can 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", "joined", "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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, 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 three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0041] The term "multiple" as used in this application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0042] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0043] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0044] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0045] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0046] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0047] As an example, the box body may include a first sub-box body and a second sub-box body. The first sub-box body and the second sub-box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covering or closing, which can be sealed or non-sealed. The first sub-box body may be a top cover or a bottom plate.

[0048] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0049] As an example, the box body may be part of the chassis structure of a vehicle. For example, the top cover of the box body may become at least a part of the floor of the vehicle, or the frame of the box body may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0050] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, and a door is provided on at least one side of the box body. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0051] In the embodiments of the present application, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material and continue to be used by charging after the battery cell discharges.

[0052] The battery cell may be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0053] Multiple battery cells in a battery device can be arranged to form a column of battery cells. The sampling component is arranged in the middle area on the column of battery cells, covering the pressure relief mechanism (such as an explosion-proof valve) on the battery cell, resulting in the gas inside the battery cell not being able to be discharged in time through the pressure relief mechanism, increasing the risk of thermal runaway. Currently, for relatively narrow battery cells, that is, battery cells with a smaller dimension in the width direction, the sampling component covers a larger area of the battery cell, even covering the entire battery cell, providing less exhaust space for the pressure relief mechanism, and making it more difficult for the gas inside the battery cell to be discharged to the outside through the pressure relief mechanism, further increasing the probability of the thermal runaway risk. In addition, the sampling component is arranged in the middle area on the column of battery cells. When the seal for sealing the liquid injection hole is located between the pressure relief mechanism and the positive terminal, due to the interference between the seal and the temperature sampling point of the sampling component, the temperature acquisition data is inaccurate, which is not conducive to the thermal management of the battery cell, and further increases the occurrence probability of the thermal runaway risk.

[0054] In response, by arranging the sampling component in the shoulder area of the battery cell outside the electrode terminal, the sampling component avoids the pressure relief mechanism and the seal, provides more exhaust space for the pressure relief mechanism, enables the gas inside the battery cell to be discharged in time through the pressure relief mechanism, and reduces the thermal runaway risk. For relatively narrow battery cells, even without changing the size of the sampling component, it can avoid the pressure relief mechanism, reduce the thermal runaway risk, and at the same time reduce the replacement cost of the sampling component. The temperature sampling point of the sampling component is no longer restricted, which is conducive to the thermal management of the battery cell, thereby further reducing the thermal runaway risk.

[0055] The battery device disclosed in the embodiments of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships, or aircraft. The power system of the power-consuming device can be composed of the battery device disclosed in the present application.

[0056] The technical solutions described in the embodiments of the present application are applicable to various power-consuming devices using battery devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships, and spacecrafts. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0057] For the convenience of description, the following embodiments take a vehicle as an example of a power-consuming device in an embodiment of the present application for illustration.

[0058] Refer to Figure 1, the vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, such as for the working power consumption requirements during the start-up, navigation, and operation of the vehicle 1000.

[0059] The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power consumption requirements during the start-up, navigation, and driving of the vehicle 1000.

[0060] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000 but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0061] Referring to Figure 2 , the battery device 100 includes a box body 10 and battery cells 20. The battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first sub-box body 11 and a second sub-box body 12. The first sub-box body 11 and the second sub-box body 12 are covered with each other, and the first sub-box body 11 and the second sub-box body 12 jointly define a storage space for accommodating the battery cells 20. The second sub-box body 12 can be a hollow structure with one end open, and the first sub-box body 11 can be a plate-like structure. The first sub-box body covers the open side of the second sub-box body 12 so that the first sub-box body 11 and the second sub-box body 12 jointly define an accommodation space; the first sub-box body 11 and the second sub-box body 12 can also both be hollow structures with one side open, and the open side of the first sub-box body 11 covers the open side of the second sub-box body 12.

[0062] In the battery device 100, there may be multiple battery cells 20. The multiple battery cells 20 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, in the battery device 100, multiple battery cells 20 can also be first connected in series, in parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box 10. The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for realizing the electrical connection between multiple battery cells.

[0063] Referring to Figure 3 , the battery cell 20 includes a housing 21, an electrode assembly 22, and other functional components. The housing 21 includes a shell 211 and an end cap 212. The shell 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0064] The shell 211 is a component for cooperating with the end cap 212 to form the internal environment of the battery cell 20. Among them, the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte, and other components. The shell 211 may contain one or more electrode assemblies 22. The shell 211 and the end cap 212 can be independent components. The shell 211 can be of various shapes and various sizes. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly. The material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0065] The end cap 212 is a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 212 can be adapted to the shape of the shell 211 to cooperate with the shell 211. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 212 is not easily deformed when being squeezed or collided, so that the battery cell 20 can have higher structural strength and the reliability can also be improved. Functional components such as electrode terminals 23 can be provided on the end cap 212. The electrode terminals 23 can be used for electrically connecting with the tabs 222 of the electrode assembly 22 to output or input the electric energy of the battery cell. The material of the end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 212. The insulating structure can be used to isolate the electrical connection components in the shell from the end cap to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0066] Next, with reference to Figures 2 to 7 , the battery device 100 according to the embodiment of the present application will be described in detail.

[0067] The battery device 100 according to the embodiment of the present application includes at least one battery cell row 20a and a sampling component 30. The at least one battery cell row 20a includes a plurality of battery cells 20 arranged along a first direction X. The battery cell 20 includes a housing 21, a pressure relief mechanism 24, and two electrode terminals 23. The housing 21 includes a first wall 213. The pressure relief mechanism 24 and the two electrode terminals 23 are both disposed on the first wall 213. The two electrode terminals 23 are spaced apart along a second direction Y. The pressure relief mechanism 24 is located between the two electrode terminals 23. The first wall 213 includes a shoulder region 213a located outside the two electrode terminals 23 along the second direction Y. The sampling component 30 is disposed in the shoulder region 213a for collecting voltage information and / or temperature information of the battery cell row 20a. In a projection plane perpendicular to a third direction Z, the orthographic projection of the sampling component 30 does not overlap with the orthographic projection of the pressure relief mechanism 24. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs.

[0068] The number of the battery cell rows 20a can be one or more, such as two, three, four, five, etc. Figure 4 and Figure 5 shows the case of two battery cell rows 20a.

[0069] Each battery cell 20 in the battery cell row 20a can be a square battery cell, a circular battery cell, a polygonal battery cell, etc. Figure 3 , Figure 4 and Figure 5 shows the case of a square battery cell.

[0070] There are various ways for the plurality of battery cells 20 in the battery cell row 20a to be arranged along the first direction X. For example, they can be arranged in a manner that the large faces (the faces along the first direction X) of the plurality of battery cells 20 face each other; or they can also be arranged in a manner that the narrow faces (the side faces along the second direction Y) of the plurality of battery cells 20 face each other. Figure 4 and Figure 5 shows the arrangement in a manner that the large faces of the plurality of battery cells 20 face each other. The so-called "large face" of the battery cell 20 is the face with the largest surface area of the battery cell 20.

[0071] The plurality of battery cells 20 in the battery cell row 20a can be connected in series or in parallel. Figure 4 shows the case where the plurality of battery cells 20 in each battery cell row 20a are connected in series and the two battery cell rows 20a are connected in parallel.

[0072] The first wall 213 can be a wall on one side of the housing 21 along the third direction Z. In the upright battery cell 20, the first wall 213 can be the top wall of the housing 21. The first wall 213 can be the end cap 212 ( Figure 3 as shown). Of course, the housing 21 can also be a structure without an end cap.

[0073] Along the second direction Y, the pressure relief mechanism 24 is located between the two electrode terminals 23. The pressure relief mechanism 24 can be an explosion-proof valve. One of the two electrode terminals 23 can be the positive electrode terminal 231, and the other can be the negative electrode terminal 232. In other embodiments, both of the two electrode terminals 23 can be positive electrode terminals 231, or both of the two electrode terminals 23 can be negative electrode terminals 232. Figure 5 The case where one of the two electrode terminals 23 is the positive electrode terminal 231 and the other is the negative electrode terminal 232 is shown.

[0074] Referring to Figure 5 , the first wall 213 has two edges located outside the two electrode terminals 23 along the second direction Y. Along the second direction Y, the area on the first wall 213 between the electrode terminal 23 and the adjacent edge is the shoulder area 213a. The area where the pressure relief mechanism 24 is located is the inner area of the first wall 213, and the area far from the pressure relief mechanism 24 is the outer area of the first wall 213.

[0075] The sampling assembly 30 can be carried on the shoulder areas 213a of all the battery cells 20 or some of the battery cells 20 in the battery cell row 20a. Exemplarily, the shoulder areas 213a of multiple battery cells 20 in the battery cell row 20a jointly form a continuous shoulder area 213a along the first direction X, and the sampling assembly 30 covers the continuous shoulder area 213a.

[0076] The sampling assembly 30 can be directly arranged on the shoulder area 213a, or can be arranged on the shoulder area 213a through an insulating support plate 50. When the sampling assembly 30 is directly arranged on the shoulder area 213a, the sampling assembly 30 can be fixed by bonding to the shoulder area 213a or other means, such as riveting.

[0077] In the projection plane perpendicular to the third direction Z, the orthographic projection of the sampling assembly 30 does not overlap with the orthographic projection of the pressure relief mechanism 24, so that the sampling assembly 30 avoids the pressure relief mechanism 24, thereby providing more exhaust space for the pressure relief mechanism 24.

[0078] By arranging the sampling component 30 in the shoulder area 213a where the first wall 213 of the battery cell 20 is located outside the electrode terminal 23, in the projection plane perpendicular to the third direction Z, the orthographic projection of the sampling component 30 does not overlap with the orthographic projection of the pressure relief mechanism 24, enabling the sampling component 30 to avoid the pressure relief mechanism 24, providing more exhaust space for the pressure relief mechanism, and significantly reducing the risk of thermal runaway. In the case of a relatively narrow battery cell 20, such as a battery cell 20 with a dimension along the second direction Y less than or equal to 50 mm, even without changing the size of the sampling component 30, it is possible to avoid the pressure relief mechanism, which not only reduces the risk of thermal runaway but also reduces the replacement cost of the sampling component 30. In addition, the temperature sampling points of the sampling component 30 are no longer restricted, which is beneficial to the thermal management of the battery cell 20, thereby further reducing the risk of thermal runaway.

[0079] In some embodiments, the number of battery cell columns 20a is multiple, and the multiple battery cell columns 20a are arranged along the second direction Y. The sampling component 30 is arranged in the adjacent shoulder areas 213a of two adjacent battery cell columns 20a.

[0080] Each battery cell column 20a has two shoulder areas 213a along the second direction Y. The sampling component 30 is arranged in the adjacent shoulder areas 213a of two adjacent battery cell columns 20a, that is, the adjacent shoulder areas 213a of two adjacent battery cell columns 20a jointly support the sampling component 30.

[0081] As an example, along the second direction Y, the sampling component 30 is located between the adjacent electrode terminals 23 of two adjacent battery cell columns 20a.

[0082] By arranging the sampling component 30 in the adjacent shoulder areas 213a of two adjacent battery cell columns 20a, the support area of the sampling component 30 can be increased, the connection reliability of the sampling component 30 can be improved, and thus the sampling reliability can be enhanced.

[0083] In some embodiments, the sampling component 30 includes a circuit board 31 and a temperature acquisition component 32. The temperature acquisition component 32 is connected to the circuit board 31 and is used to acquire the temperature information of the battery cell column 20a. The temperature acquisition component 32 is connected to the shoulder area 213a.

[0084] The temperature acquisition component 32 can be connected to the shoulder area 213a of any one or more battery cells 20 in the battery cell column 20a. Figure 4The situation where the temperature acquisition component 32 is connected to the shoulder region 213a of one battery cell 20 in the battery cell column 20a is shown. It can be understood that multiple temperature acquisition components 32 can also be provided, and the multiple temperature acquisition components 32 can be respectively connected to the shoulder regions 213a of multiple battery cells 20. The temperature acquisition component 32 can be a temperature sensor.

[0085] The temperature acquisition component 32 and the shoulder region 213a can be directly connected or connected through a heat conduction pad. The direct connection can be bonding, crimping, etc. between the temperature acquisition component 32 and the shoulder region 213a.

[0086] By connecting the temperature acquisition component 32 to the shoulder region 213a without interfering with the components (such as the pressure relief mechanism 24, the seal 25, etc.) in the inner region of the two electrode terminals 23 along the second direction Y of the first wall 213, the temperature information of the battery cell 20 can be collected more accurately, which is beneficial to the thermal management of the battery cell 20, thereby further reducing the risk of thermal runaway.

[0087] In some embodiments, the sampling assembly 30 further includes a heat conduction pad that connects the temperature acquisition component 32 and the shoulder region 213a.

[0088] The heat conduction pad and the temperature acquisition component 32 can be an integral structure or two independent components. The material of the heat conduction pad can be silicone, double-sided tape, etc.

[0089] By connecting the temperature acquisition component 32 and the shoulder region 213a through the heat conduction pad, the heat conduction pad can play a certain role in heat conduction and insulation, improving the accuracy and reliability of temperature acquisition.

[0090] In some embodiments, the first wall 213 is provided with a liquid injection hole (not shown in the figure). The battery cell 20 further includes a seal 25 that seals the liquid injection hole. In the projection plane perpendicular to the third direction Z, the orthographic projection of the sampling assembly 30 does not overlap with the orthographic projection of the seal 25.

[0091] The seal 25 is used to seal the liquid injection hole, and the seal 25 can be a sealing nail, etc.

[0092] The sampling assembly 30 avoids the seal 25, and the temperature acquisition is not affected by the seal 25, making the temperature information collected by the sampling assembly 30 more accurate, which is beneficial to the thermal management of the battery cell 20, thereby further reducing the risk of thermal runaway.

[0093] In some embodiments, one of the two electrode terminals 23 is the positive electrode terminal 231, and the other is the negative electrode terminal 232. The seal 25 is located between the positive electrode terminal 231 and the pressure relief mechanism 24.

[0094] Since the temperature acquisition component 32 is located in the shoulder region 213a and avoids the seal 25, even when the seal 25 is located between the positive terminal 231 and the pressure relief mechanism 24, it can accurately acquire the temperature information near the positive terminal 231 of the battery cell 20, which is beneficial to the thermal management of the battery cell 20, thereby further reducing the risk of thermal runaway. In the related art, the sampling component 30 is arranged at the middle position of the battery cell row 20a. When the seal 25 is located between the positive terminal 231 and the pressure relief mechanism 24, if the temperature near the positive terminal 231 is acquired, the seal 25 interferes with the temperature acquisition component 32, affecting the acquisition accuracy and being unfavorable to the thermal management of the battery cell 20.

[0095] In some embodiments, in the battery cell 20 connected with the temperature acquisition component 32, the positive terminal 231 is closer to the temperature acquisition component 32 than the negative terminal 232.

[0096] The temperature acquisition component 32 is located in the shoulder region 213a of the battery cell 20 closer to the positive terminal 231, without being interfered by the seal 25, and can accurately acquire the temperature information near the positive terminal 231, which is beneficial to the thermal management of the battery cell 20.

[0097] In some embodiments, in the battery cell 20 connected with the temperature acquisition component 32, the negative terminal 232 is closer to the temperature acquisition component 32 than the positive terminal 231.

[0098] The temperature acquisition component 32 is located in the shoulder region 213a of the battery cell 20 closer to the negative terminal 232, without being interfered by the seal 25, and can accurately acquire the temperature information near the negative terminal 232, which is beneficial to the thermal management of the battery cell 20.

[0099] In some embodiments, the battery device 100 further includes a bus bar component 40 and a support plate 50. In the battery cell row 20a, the electrode terminals 23 of multiple battery cells 20 are connected through the bus bar component 40. A part of the support plate 50 is located between the shoulder region 213a and the bus bar component 40, and the support plate 50 is made of insulating material. The circuit board 31 is connected to the side of the support plate 50 facing away from the battery cell 20.

[0100] Multiple battery cells 20 can be connected in series or in parallel through the bus bar component 40. Figure 4 It shows the situation where in each battery cell row 20a, multiple battery cells 20 can be connected in series through the bus bar component 40 and two battery cell rows 20a are connected in parallel. The bus bar component 40 can be a tab.

[0101] The support plate 50 is used to support and fix the circuit board 31. As an example, refer to Figure 7, rivets are provided on the support plate 50, and the circuit board 31 is provided with riveting holes that cooperate with the rivets 53. The rivets 53 pass through the riveting holes and fix the circuit board 31 and the support plate 50 by means of hot riveting. The support plate 50 can be an injection-molded part.

[0102] As an example, the support plate 50 can also be provided with a first through hole 54 for avoiding the electrode terminal 23, so that the busbar component 40 can be connected to the electrode terminal 23, for example, by welding.

[0103] As an example, the support plate 50 can also be provided with a second through hole 52 for avoiding the pressure relief mechanism 24 and a third through hole 51 for avoiding the temperature acquisition component 32.

[0104] By connecting the circuit board 31 to the side of the support plate 50 facing away from the battery cell 20, the connection stability of the sampling component 30 can be improved.

[0105] In some embodiments, the sampling component 30 further includes a voltage acquisition component 33 connected to the circuit board 31. The voltage acquisition component 33 is connected to the busbar component 40 and is used to acquire the voltage information of the battery cell row 20a.

[0106] The voltage acquisition component 33 can be welded or crimped to the busbar component 40. The voltage acquisition component 33 can be a nickel sheet. Multiple voltage acquisition components 33 of one sampling component 30 can detect the voltage information of one battery cell row 20a. Multiple voltage acquisition components 33 of two sampling components 30 can also detect the voltage information of one battery cell row 20a.

[0107] By connecting the voltage acquisition component 33 to the busbar component 40, the voltage information of the battery cell 20 can be detected, which is beneficial to better manage the battery cell 20, thereby further reducing the risk of thermal runaway.

[0108] The embodiment of the present application also provides an electrical device, including the battery device 100 of any one of the above embodiments.

[0109] Next, with reference to Figures 2 to 7 , a specific example of the battery device 100 of the embodiment of the present application will be described.

[0110] The present application provides a battery device 100, which includes a sampling component 30 and two battery cell columns 20a arranged along the second direction Y. Each battery cell column 20a includes a plurality of battery cells 20 arranged along the first direction X. The plurality of battery cells 20 are connected in series through a busbar component 40, and the two battery cell columns 20a are connected in parallel. Each battery cell 20 includes a housing 21, a pressure relief mechanism 24, a seal 25, a positive terminal 231, and a negative terminal 232. The housing 21 includes a first wall 213. The pressure relief mechanism 24, the seal 25, the positive terminal 231, and the negative terminal 232 are all arranged on the first wall 213. The positive terminal 231 and the negative terminal 232 are arranged at intervals along the second direction Y. The pressure relief mechanism 24 is located between the positive terminal 231 and the negative terminal 232. The seal 25 is arranged between the positive terminal 231 and the pressure relief mechanism 24. The first wall 213 includes a shoulder region 213a located outside the two electrode terminals 23 along the second direction Y.

[0111] The sampling component 30 includes a circuit board 31, a temperature acquisition component 32, a voltage acquisition component 33, and a connector 34 that are electrically connected to the circuit board 31. The sampling component 30 is arranged in the adjacent shoulder regions 213a of two adjacent battery cell columns 20a. Along the second direction Y, the circuit board 31 is located between the adjacent electrode terminals 23 of the two adjacent battery cell columns 20a. In the projection plane perpendicular to the third direction Z, the orthographic projection of the sampling component 30 does not overlap with the orthographic projection of the pressure relief mechanism 24. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs. The temperature acquisition component 32 is connected to the shoulder region 213a through a heat-conducting pad and is used to acquire the temperature information of the battery cell column 20a. The voltage acquisition component 33 is connected to the busbar component 40 and is used to acquire the voltage information of the battery cell column 20a. The temperature acquisition component 32 is a temperature sensor. The voltage acquisition component 33 is a nickel sheet.

[0112] The battery device 100 further includes a support plate 50. A part of the support plate 50 is located between the shoulder region 213a and the busbar component 40. The support plate 50 is made of an insulating material. The circuit board 31 is connected to the side of the support plate 50 facing away from the battery cell 20. Refer to Figure 7 , rivets are provided on the support plate 50, and riveting holes are provided on the circuit board 31 to cooperate with the rivets 53. The rivets 53 pass through the riveting holes and fix the circuit board 31 and the support plate 50 by hot riveting. The support plate 50 may also be provided with a first through hole 54 for avoiding the electrode terminal 23, so that the busbar component 40 can be connected to the electrode terminal 23, such as by welding. The support plate 50 may also be provided with a second through hole 52 for avoiding the pressure relief mechanism 24.

[0113] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the protection scope.

Claims

1. A battery device, characterized in that, Comprising: At least one battery cell column, the battery cell column including a plurality of battery cells arranged in a first direction; the battery cell includes a housing, a seal, a pressure relief mechanism, and two electrode terminals, the housing includes a first wall, the first wall is provided with a liquid injection hole, the seal seals the liquid injection hole, the pressure relief mechanism and the two electrode terminals are both arranged on the first wall, the two electrode terminals are spaced apart in a second direction, and the pressure relief mechanism is located between the two electrode terminals; the first wall includes a shoulder region located outside the two electrode terminals along the second direction; A sampling assembly, arranged in the shoulder region, for collecting voltage information and / or temperature information of the battery cell column. In a projection plane perpendicular to a third direction, the orthographic projection of the sampling assembly does not overlap with the orthographic projection of the pressure relief mechanism and the orthographic projection of the seal. The first direction, the second direction, and the third direction are perpendicular to each other in pairs.

2. The battery device according to claim 1, wherein: The number of the battery cell columns is multiple, and the multiple battery cell columns are arranged along the second direction; The sampling assembly is arranged in the adjacent shoulder regions of two adjacent battery cell columns.

3. The battery device according to claim 1, wherein: The sampling assembly includes a circuit board and a temperature acquisition component, the temperature acquisition component is connected to the circuit board and is used for collecting the temperature information of the battery cell column, and the temperature acquisition component is connected to the shoulder region.

4. The battery device according to claim 3, wherein: The sampling assembly further includes a heat conduction pad, and the heat conduction pad connects the temperature acquisition component and the shoulder region.

5. The battery device according to claim 3, wherein: One of the two electrode terminals is a positive electrode terminal, and the other is a negative electrode terminal, and the seal is located between the positive electrode terminal and the pressure relief mechanism.

6. The battery device according to claim 5, wherein: In the battery cell connected with the temperature acquisition component, the positive electrode terminal is closer to the temperature acquisition component than the negative electrode terminal or the negative electrode terminal is closer to the temperature acquisition component than the positive electrode terminal.

7. The battery device according to claim 3, characterized in that, The battery device further includes: A busbar component, in the battery cell column, the electrode terminals of the multiple battery cells are connected through the busbar component; A support plate, a part of the support plate is located between the shoulder region and the busbar component, and the support plate is made of an insulating material; The circuit board is connected to a side of the support plate facing away from the battery cell.

8. The battery device according to claim 7, wherein: The sampling assembly further includes a voltage acquisition component connected to the circuit board, and the voltage acquisition component is connected to the busbar component and is used for collecting the voltage information of the battery cell column.

9. The battery device according to claim 1, wherein: The size of the battery cell along the second direction is less than or equal to 50 mm.

10. An electrical device, characterized in that, Comprising: The battery device according to any one of claims 1-9.

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