Battery module, battery pack, and electric device

Abstract

A battery module, a battery pack, and an electric device. The electric device comprises the battery pack; the battery pack comprises the battery module; and the battery module comprises at least one battery unit (1000), battery cells (100), and a sampling structure (200). The battery unit (1000) comprises the sampling structure (200) and two groups of battery cells (100), each group of battery cells (100) are formed by stacking a plurality of battery cells (100) in a first direction (W1), and the two groups of battery cells (100) are arranged side by side in a second direction (W2), wherein the first direction (W1) intersects the second direction (W2). The battery cells (100) each comprise an end cover (11), and a first pole (12), a second pole (13) and a detection pole (14) which are provided on the end cover (11); the second pole (13) is electrically connected to the detection pole (14); the sampling structure (200) is arranged on the top side of the junction between the two groups of battery cells (100), and is respectively electrically connected to the first poles (12) and the detection poles (14) of each group of battery cells (100), such that the two groups of battery cells (100) share the sampling structure (200).

Description

Battery module, battery pack and electric device

[0001] Cross-reference to related applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202410211209.6, filed on February 26, 2024, entitled "Battery module, battery pack and electric device", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure belongs to the technical field of batteries, and particularly relates to a battery module, a battery pack and an electric device. BACKGROUND

[0004] With the continuous development of the electric vehicle industry, the packaging technology of the power battery system of the electric vehicle is also continuously improving, and the automation and modularization of the packaging of the power battery system gradually become the mainstream of development. The battery module in the power battery system is relatively important. In the related technology, a sampling structure is arranged on the top side of each group of stacked battery monomers, and the sampling structure is connected to the positive and negative poles of the battery monomer by means of aluminum wire bonding, so as to realize the collection of the voltage and other information of the battery monomer.

[0005] However, this method increases the arrangement difficulty of the sampling structure and the use amount of the sampling structure.

[0006] SUMMARY

[0007] Therefore, the embodiments of the present disclosure aim to provide a battery module, a battery pack and an electric device, which reduce the use amount of the sampling structure and the arrangement difficulty of the sampling structure.

[0008] In a first aspect, the embodiments of the present disclosure provide a battery module, comprising:

[0009] at least one battery unit, the battery unit comprising a sampling structure and two groups of battery monomers, each group of battery monomers being formed by stacking a plurality of battery monomers along a first direction, and the two groups of battery monomers being arranged side by side along a second direction; wherein the first direction and the second direction intersect;

[0010] The battery monomer comprises an end cover, a first pole arranged on the end cover, a second pole and a detection pole, and the second pole is electrically connected to the detection pole.

[0011] The sampling structure is arranged on the top side of the junction of the two groups of battery monomers, the first pole is located at one end of the end cover close to the sampling structure, and the distance from the sampling structure to the detection pole is less than the distance from the sampling structure to the second pole.

[0012] The sampling structure is electrically connected with the first pole and the detection pole of each group of battery monomers respectively, so that the two groups of battery monomers share the sampling structure.

[0013] The battery module provided by the embodiment of the present disclosure adopts the detection pole and the second pole to be electrically connected, and the sampling structure is electrically connected with the detection pole and the first pole of each group of battery monomers respectively, so that the two groups of battery monomers share the sampling structure. In this way, the use amount of the sampling structure can be reduced. Since the detection pole is closer to the sampling structure than the second pole, and the first pole is also closer to the sampling structure, the electrical connection path between the sampling structure and the first pole and the detection pole can be shortened, and the arrangement difficulty of the sampling structure is reduced.

[0014] In some embodiments, the sampling structure includes a flexible circuit board. In this way, the flexible circuit board can be freely bent, wound, and folded, and can be arranged arbitrarily according to the space layout requirements and moved and stretched in three-dimensional space. In the battery module, the flexible circuit board is used to sample the voltage of each battery monomer, which has the advantages of low cost, high space utilization, and facilitating automatic production.

[0015] In some embodiments, the two groups of battery monomers are arranged symmetrically.

[0016] In this way, the battery units can be arranged neatly.

[0017] In some embodiments, the polarities of the first poles of the two groups of battery monomers are the same. In this way, the arrangement of the sampling structure can be facilitated.

[0018] In some embodiments, the polarities of the first poles in the same group of battery monomers are the same, and the polarities of the first poles of the two groups of battery monomers are different.

[0019] In this way, the battery module can meet the transmission connection mode of total positive and total negative.

[0020] In some embodiments, the detection pole is located between the first pole and the second pole.

[0021] In this way, the area between the first pole and the second pole on the end cover can be fully utilized, and the detection pole can be conveniently arranged.

[0022] In some embodiments, the second pole, the detection pole, and the first pole are arranged along the same line. In this way, the arrangement of the three on the end cover can be neat and beautiful.

[0023] In some embodiments, the distance from the detection pole to the first pole is less than the distance from the detection pole to the second pole.

[0024] In this way, the detection pole is arranged closer to the second pole, and the distance between the detection pole and the sampling structure is further shortened, so that the electrical connection between the detection pole and the sampling structure is facilitated.

[0025] In some embodiments, the battery monomer further comprises an explosion-proof valve arranged on the end cover, the explosion-proof valve is located between the first pole and the second pole, and the detection pole is located between the explosion-proof valve and the first pole. In this way, the detection pole is arranged close to the sampling structure, and the connection difficulty between the detection pole and the sampling structure is reduced, thereby reducing the arrangement difficulty of the sampling structure.

[0026] In some embodiments, the distance between the detection pole and the first pole is less than the distance between the detection pole and the explosion-proof valve. In this way, the detection pole is arranged close to the sampling structure.

[0027] In some embodiments, the outer diameter of the detection pole is less than the outer diameter of the first pole; and / or, the outer diameter of the detection pole is less than the outer diameter of the second pole. In this way, the outer diameter of the detection pole is relatively small, which can reduce the influence of the detection pole on the current convergence of the first pole, and reduce the influence of the detection pole on the current convergence of the second pole, and also reduce the occupation area of the detection pole on the end cover.

[0028] In some embodiments, the protrusion height of the detection pole on the end cover is less than the protrusion height of the first pole on the end cover; and / or, the protrusion height of the detection pole on the end cover is less than the protrusion height of the second pole on the end cover.

[0029] In this way, the influence of the detection pole on the current convergence of the first pole and the influence of the detection pole on the current convergence of the second pole can be reduced.

[0030] In some embodiments, the battery unit comprises a first adapter plate, and the first pole and the detection pole are respectively electrically connected to the first adapter plate.

[0031] In this way, the electrical connection between the detection pole and the first pole can be realized through the first adapter plate, without the need for additional aluminum wire bonding or conductive wire connection, and the connection mode is simple and reliable.

[0032] In some embodiments, the number of battery units is at least two, and at least a part of the battery units are arranged side by side along the first direction; and / or, at least a part of the battery units are arranged side by side along the second direction.

[0033] In this way, the diversity and flexibility of the arrangement of the battery units can be increased, thereby increasing the diversity of the battery module.

[0034] In a second aspect, the battery pack is provided, which comprises the battery module according to any of the embodiments of the battery pack.

[0035] The battery pack provided by the embodiments of the present disclosure can reduce the use amount of the sampling structure in the battery module and reduce the arrangement difficulty of the sampling structure by using the battery module. Furthermore, the use amount of the sampling structure in the battery pack can be reduced, and the arrangement difficulty of the sampling structure can be reduced. Thus, the power utilization device has lower cost and higher reliability.

[0036] The power utilization device provided by the embodiments of the present disclosure can reduce the use amount of the sampling structure in the battery module and reduce the arrangement difficulty of the sampling structure by using the battery module or the battery pack. Furthermore, the use amount of the sampling structure in the battery pack can be reduced, and the arrangement difficulty of the sampling structure can be reduced. Thus, the power utilization device has lower cost and higher reliability.

[0037] The above description is only a summary of the technical solutions of the present disclosure. In order to more clearly understand the technical means of the present disclosure, the embodiments can be implemented in accordance with the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present disclosure more obvious and easy to understand, the specific embodiments of the present disclosure are described below. BRIEF DESCRIPTION OF DRAWINGS

[0038] FIG. 1 is a schematic diagram of a partial structure of a battery module according to some embodiments of the present disclosure;

[0039] FIG. 2 is a schematic diagram of an end cover, a first pole, a second pole, a detection pole and an explosion-proof valve of a battery cell according to some embodiments of the present disclosure;

[0040] FIG. 3 is a partial enlarged view of A in FIG. 2.

[0041] Explanation of reference signs:

[0042] 1000, battery cell; 100, battery cell; 200, sampling structure; 11, end cover; 12, first pole; 13, second pole; 14, detection pole; 15, explosion-proof valve; D1, outer diameter of the detection pole; D2, outer diameter of the first pole; D3, outer diameter of the second pole; L1, distance from the detection pole to the sampling structure; L2, distance from the sampling structure to the second pole; L3, distance from the first pole to the sampling structure; L4, distance from the first pole to the detection pole; L5, distance from the first pole to the explosion-proof valve; H1, protrusion height of the detection pole on the end cover; H2, protrusion height of the first pole on the end cover; W1, first direction; W2, second direction. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0044] In the specific embodiments, various specific technical features described can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of various specific technical features in the present application are not described again.

[0045] In the following description, the terms "first", "second", "..." are only used to distinguish different objects, and do not mean that there is the same or relationship between the objects. It should be understood that the orientation description "upper", "lower", "outer", "inner" is the orientation in the normal use state, and the "left", "right" direction indicates the left and right directions shown in the specific corresponding schematic diagram, which can be the left and right directions in the normal use state or not.

[0046] It should be noted that the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "includes one" does not exclude the presence of another identical element in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0047] At present, new energy batteries are more and more widely used in life and industry. New energy batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and other fields. With the continuous expansion of the application field of power batteries, the market demand is also increasing.

[0048] In the related art, the automation and modularization of the power battery system packaging gradually become the mainstream of development. The battery module in the power battery system is more important, and in the related art, a sampling structure is arranged on the top side of each battery monomer arranged in a row, and the sampling structure is connected to the positive and negative poles of the battery monomer by means of aluminum wire bonding, so as to realize the collection of the voltage and other information of the battery monomer.

[0049] However, this way will increase the arrangement difficulty of the sampling structure and the use amount of the sampling structure.

[0050] In view of the above problems, the battery module provided by the embodiments of the present disclosure includes at least one battery cell.

[0051] The battery cell includes a sampling structure and two groups of battery monomers, each group of battery monomers is formed by stacking a plurality of battery monomers along a first direction, and the two groups of battery monomers are arranged side by side along a second direction; wherein the first direction and the second direction intersect. The battery monomer includes an end cover, a first pole column arranged on the end cover, a second pole column, and a detection pole column, and the second pole column is electrically connected with the detection pole column. The sampling structure is arranged on the top side of the junction of the two groups of battery monomers, the first pole column is located at one end of the end cover close to the sampling structure, and the distance from the sampling structure to the detection pole column is less than the distance from the sampling structure to the second pole column. The sampling structure is electrically connected with the first pole column and the detection pole column of each group of battery monomers, so that the two groups of battery monomers share the sampling structure. In this way, the use amount of the sampling structure can be reduced. Since the detection pole column is closer to the sampling structure than the second pole column, and the first pole column is also closer to the sampling structure, the electrical connection path between the sampling structure and the first pole column and the detection pole column can be shortened, thereby reducing the arrangement difficulty of the sampling structure.

[0052] The battery pack provided by the embodiments of the present disclosure includes the above-mentioned battery module.

[0053] The embodiments of the present disclosure also provide a power consumption device including the above-mentioned battery module or battery pack. The battery module or battery pack can provide power for the power consumption device. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0054] In the following embodiments, the power consumption device vehicle of an embodiment of the present disclosure is taken as an example for illustration.

[0055] The vehicle can be a fuel car, a gas car, or a new energy car. The new energy car can be a pure electric car, a hybrid car, or a range extended car, etc. The vehicle is internally provided with a battery, which can be arranged at the bottom, the head, or the tail of the vehicle. The battery can be used for power supply of the vehicle, for example, the battery can be used as the operating power source of the vehicle. The vehicle can also include a controller and a motor, and the controller is used to control the battery to supply power to the motor, for example, to meet the working power demand of the vehicle during starting, navigation, and driving.

[0056] In some embodiments of the present disclosure, the battery can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0057] The battery module provided by the embodiments of the present disclosure includes at least one battery unit 1000. The battery unit 1000 includes a sampling structure 200 and two groups of battery monomers 100. Each group of battery monomers 100 is formed by stacking a plurality of battery monomers 100 along a first direction W1, and the two groups of battery monomers 100 are arranged side by side along a second direction W2. The first direction W1 and the second direction W2 intersect. The battery monomer 100 includes an end cover 11, a first pole 12, a second pole 13 and a detection pole 14 arranged on the end cover 11, and the second pole 13 is electrically connected to the detection pole 14. The sampling structure 200 is arranged on the top side of the junction of the two groups of battery monomers 100. The first pole 12 is located at one end of the end cover 11 close to the sampling structure 200, and the distance L1 from the sampling structure 200 to the detection pole 14 is less than the distance L2 from the sampling structure 200 to the second pole 13. The sampling structure 200 is electrically connected to the first pole 12 and the detection pole 14 of each group of battery monomers 100, so that the two groups of battery monomers 100 share the sampling structure 200.

[0058] In FIG. 1, the structure in the dashed box schematically shows one battery unit 1000. Two dashed boxes are exemplarily shown in FIG. 1, i.e., two battery units 1000 are exemplarily shown. It can be understood that the number of the battery units 1000 is not limited to this in the embodiments of the present disclosure, and can be one, two or more than two, etc.

[0059] It should be noted that, since the first pole 12 is located at one end of the end cover 11 close to the sampling structure 200, the distance L3 from the sampling structure 200 to the first pole 12 is less than the distance L2 from the sampling structure 200 to the second pole 13, that is, L3 < L2 and L1 < L2 in the embodiments of the present disclosure.

[0060] The distance L1 from the sampling structure 200 to the detection pole 14 refers to the distance between the edge of the sampling structure 200 close to the side where the detection pole 14 is located and the center of the detection pole 14.

[0061] The distance L2 from the sampling structure 200 to the second pole 13 refers to the distance between the edge of the sampling structure 200 close to the side where the detection pole 14 is located and the center of the second pole 13.

[0062] The distance L3 from the sampling structure 200 to the first pole 12 refers to the distance between the edge of the sampling structure 200 close to the side where the detection pole 14 is located and the center of the first pole 12.

[0063] The battery cell 100 refers to a basic device and a basic unit for directly converting chemical energy into electrical energy, and is a basic element constituting a battery. Its components include electrolyte, positive and negative electrodes, separators, etc. The battery cell 100 is also the smallest unit constituting a power battery module, that is, the individual battery is in a single form without internal series and parallel combination, and the external electrode is also directly led out by the battery cell 100.

[0064] The sampling structure 200 refers to a structure for transmitting electrical signals collected from each battery cell 1000.

[0065] Exemplarily, the battery cell includes a shell and an electrode assembly, the shell has an opening, the end cover 11 described above closes the opening, and the electrode assembly is arranged in the shell. The shell and the end cover 11 are appearance structural parts of the battery cell.

[0066] The electrode assembly is a component in which an electrochemical reaction occurs in the battery cell. One or more electrode assemblies can be contained in the shell. The electrode assembly is mainly formed by winding an electrode tab (a positive electrode tab and a negative electrode tab), and a separator is usually arranged between the positive electrode tab and the negative electrode tab. The electrode tab (the positive electrode tab and the negative electrode tab) has a portion of an active material constituting a main body of the electrode assembly, and the main body is connected to a tab. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at two ends of the main body, respectively. In the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab is connected to the post to form a current loop.

[0067] It should be noted that one of the first post 12 and the second post 13 is positive, and the other is negative.

[0068] Among them, one of the first post 12 and the second post 13 establishes a conductive path with the positive electrode tab, and the other establishes a conductive path with the negative electrode tab.

[0069] The end cover 11 is a component for isolating the internal environment of the battery cell 100 from the external environment. The end cover 11 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 11 is not easy to deform when subjected to extrusion and collision, so that the battery cell 100 can have higher structural strength, and the safety performance can also be improved.

[0070] The material of the end cover 11 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present disclosure do not make special limitations thereon. In some embodiments, the inner side of the end cover 11 can also be provided with an insulating part to reduce the risk of short circuit. Exemplarily, the insulating part can be plastic, rubber, etc.

[0071] The first pole column 12 (or the second pole column 13) is a component with electrically conductive properties, and the first pole column 12 (or the second pole column 13) serves as a current transmission end of the battery monomer 100 for transmitting current.

[0072] The sampling structure 200 is arranged at the top side of the junction of the two groups of battery monomers 100, that is, the sampling structure 200 is arranged along the first direction W1, and blocks the arrangement gap between the two groups of battery monomers 100, that is, a part of the sampling structure 200 along the width direction is located at the top side of one group of battery monomers 100, and another part is located at the top side of the other group of battery monomers 100.

[0073] The second pole column 13 is electrically connected to the detection pole column 14, that is, the second pole column 13 and the detection pole column 14 have the same electric potential, for example, the two can be electrically connected by aluminum wire bonding, or by internal adapter sheet, etc.

[0074] The sampling structure 200 is electrically connected to the first pole column 12 and the detection pole column 14 of each group of battery monomers 100, that is, for example, one group of battery monomers 100 of a single battery cell 1000 is a first group of battery monomers, and the other group of battery monomers 100 is a second group of battery monomers, the sampling structure 200 is electrically connected to the first pole column 12 and the detection pole column 14 of each battery monomer in the first group of battery monomers, and also electrically connected to the first pole column 12 and the detection pole column 14 of each battery monomer in the first group of battery monomers.

[0075] The battery module of the embodiment of the present disclosure, since the detection pole column 14 is electrically connected to the second pole column 13, and the sampling structure 200 is electrically connected to the detection pole column 14 and the first pole column 12 of each group of battery monomers 100, so that the two groups of battery monomers 100 share the sampling structure 200, thus the use amount of the sampling structure 200 can be reduced. Since the detection pole column 14 is closer to the sampling structure 200 than the second pole column 13, and the first pole column 12 is also closer to the sampling structure 200, the electrical connection path between the sampling structure 200 and the first pole column 12 and the detection pole column 14 can be shortened, and the arrangement difficulty of the sampling structure 200 is reduced. That is, the embodiment of the present disclosure can save costs while reducing the arrangement difficulty of the sampling structure 200.

[0076] In the embodiment of the present disclosure, taking the rectangular battery monomer as an example, the large faces of the same group of battery monomers are stacked against each other, and the small faces of the two groups of battery monomers are arranged against each other. That is, the first direction W1 is parallel to the arrangement direction of the large face of the battery monomer, and the second direction W2 is parallel to the arrangement direction of the small face of the battery monomer.

[0077] The specific type of the sampling structure 200 is not limited.

[0078] For example, in some embodiments, the sampling structure 200 comprises a flexible circuit board. The flexible circuit board is a printed circuit made of a flexible insulating substrate, which has many advantages, such as it can be freely bent, wound, folded, arranged arbitrarily according to the space layout requirements, and moved and stretched arbitrarily in three-dimensional space. In the battery module, sampling the voltage of each battery cell 100 by using the flexible circuit board has the advantages of low cost, high space utilization, and facilitating automated production.

[0079] In other embodiments, the sampling structure 200 comprises a wire harness formed by a plurality of wires constrained together.

[0080] In some embodiments, the two groups of battery cells 100 are symmetrically arranged. The symmetric arrangement can be understood as that one group of battery cells 100 is mirrored about a symmetry plane to obtain the other group of battery cells. The symmetric arrangement is conducive to the neat arrangement of the battery cells 1000.

[0081] Of course, in other embodiments, the two groups of battery cells 100 can also be asymmetrically arranged.

[0082] In some embodiments, the polarities of the first poles 12 of the two groups of battery cells 100 are the same. For example, the polarities of the first poles 12 of one group of battery cells 100 in FIG. 1 are all positive, and the polarities of the first poles 12 of the other group of battery cells 100 are also positive. For another example, the polarities of the first poles 12 of one group of battery cells 100 in FIG. 1 are all negative, and the polarities of the first poles 12 of the other group of battery cells 100 are also negative. In this way, the arrangement of the sampling structure can be facilitated.

[0083] In some embodiments, the polarities of the first poles 12 in the same group of battery cells 100 are the same, and the polarities of the first poles 12 of the two groups of battery cells 100 are different. For example, the polarities of the first poles 12 of one group of battery cells 100 in FIG. 1 are all positive, and the polarities of the first poles 12 of the other group of battery cells 100 are all negative. In this way, it is conducive to the battery module to meet the transmission connection mode of total positive and total negative.

[0084] The specific position of the detection pole 14 is not limited.

[0085] For example, in some embodiments, the detection pole 14 is located between the first pole 12 and the second pole 13. In this way, the area between the first pole 12 and the second pole 13 on the end cover 11 can be fully utilized to facilitate the arrangement of the detection pole 14. In some embodiments, the second pole 13, the detection pole 14, and the first pole 12 are arranged along the same straight line. Here, the arrangement along the same straight line means that the centers of the three poles are located on the same straight line. In this embodiment, the arrangement of the second pole 13, the detection pole 14, and the first pole 12 along the same straight line can make the arrangement of the three poles on the end cover 11 more neat and beautiful.

[0086] It should be noted that in other embodiments, the centers of the second pole 13, the detection pole 14, and the first pole 12 can also not be on the same straight line.

[0087] In some embodiments, the distance L4 from the detection pole 14 to the first pole 12 is less than the distance L6 from the detection pole 14 to the second pole 13, i.e., L4 < L6. In this way, the detection pole 14 is closer to the second pole 13, which further shortens the distance between the detection pole 14 and the sampling structure 200, facilitating the electrical connection between the detection pole 14 and the sampling structure 200.

[0088] Here, the distance L4 from the detection pole 14 to the first pole 12 refers to the distance between the center of the detection pole 14 and the center of the first pole 12.

[0089] The distance L6 from the detection pole 14 to the second pole 13 refers to the distance between the center of the detection pole 14 and the center of the second pole 13.

[0090] In some embodiments, the battery cell 100 further includes an explosion-proof valve 15 arranged on the end cover 11. The explosion-proof valve 15 is located between the first pole 12 and the second pole 13, and the detection pole 14 is located between the explosion-proof valve 15 and the first pole 12.

[0091] The explosion-proof valve 15 is used to prevent and deal with the overpressure or overheating problem of the battery cell 100 under certain conditions, so as to avoid the explosion of the battery cell 100.

[0092] In this embodiment, the explosion-proof valve 15 is located between the first pole 12 and the second pole 13, and the detection pole 14 is located between the explosion-proof valve 15 and the first pole 12, which can make the detection pole 14 close to the sampling structure 200, reduce the connection difficulty of the detection pole 14 and the sampling structure 200, and further reduce the arrangement difficulty of the sampling structure 200.

[0093] In some embodiments, the distance L4 from the detection pole 14 to the first pole 12 is smaller than the distance L5 from the detection pole 14 to the explosion-proof valve 15, i.e. L4 < L5. That is, the detection pole 14 is closer to the first pole 12 than to the explosion-proof valve 15, i.e. the detection pole 14 is close to the sampling structure 200.

[0094] The distance L5 from the detection pole 14 to the explosion-proof valve 15 refers to the distance from the center of the detection pole 14 to the center of the explosion-proof valve 15.

[0095] If the projection shape of the explosion-proof valve 15 on the end cover 11 is circular, the center of the projection of the explosion-proof valve 15 is the center of the explosion-proof valve 15. If the projection shape of the explosion-proof valve 15 on the end cover 11 is elliptical, the midpoint of the long axis direction of the ellipse is the center of the explosion-proof valve 15.

[0096] In some embodiments, the outer diameter D1 of the detection pole 14 is smaller than the outer diameter D2 of the first pole 12, i.e. D1 < D2; and / or, the outer diameter D1 of the detection pole is smaller than the outer diameter D3 of the second pole 13, i.e. D1 < D3. In this way, the outer diameter D1 of the detection pole 14 is relatively small, which can reduce the influence of the detection pole 14 on the current convergence of the first pole 12, and reduce the influence of the detection pole 14 on the current convergence of the second pole 13, and also reduce the occupation area of the detection pole 14 on the end cover 11.

[0097] In some embodiments, the outer diameter D2 of the first pole 12 and the outer diameter D3 of the second pole 13 are the same, i.e. D2 = D3.

[0098] The outer diameter D1 of the detection pole 14, the outer diameter D2 of the first pole 12, and the outer diameter of the second pole 13 can be measured by using a vernier caliper or a micrometer.

[0099] The outer diameter D1 of the detection pole 14 is the maximum diameter of the part of the detection pole 14 protruding from the end cover 11.

[0100] The outer diameter D2 of the first pole 12 is the maximum diameter of the part of the first pole 12 protruding from the end cover 11.

[0101] The outer diameter D3 of the second pole 13 is the maximum diameter of the part of the second pole 13 protruding from the end cover 11.

[0102] In some embodiments, referring to FIG. 3, the protruding height H1 of the detection pole 14 on the end cover 11 is smaller than the protruding height H2 of the first pole 12 on the end cover 11, i.e. H1 < H2; and / or, the protruding height of the detection pole 14 on the end cover 11 is smaller than the protruding height of the second pole 13 on the end cover 11. This can reduce the influence of the detection pole 14 on the current convergence of the first pole 12, and reduce the influence of the detection pole 14 on the current convergence of the second pole 13.

[0103] The protruding height H1 of the detection pole 14 on the end cover 11 is the distance from the highest point of the detection pole 14 to the reference plane of the outer surface of the end cover 11. The reference plane of the end cover 11 can be understood as that a local part of a flat metal plate is processed, and the outer surface of the flat metal plate is the reference plane.

[0104] The protruding heights of the first pole 12 and the second pole 13 on the end cover 11 can be understood as the distances from the highest points of the first pole 12 and the second pole 13 to the reference plane.

[0105] In some embodiments, the protruding height H2 of the first pole 12 on the end cover 11 is the same as the protruding height of the second pole 13 on the end cover 11.

[0106] In some embodiments, the battery unit 1000 includes a first adapter plate, and the first pole 12 and the detection pole 14 are electrically connected to the first adapter plate. The first adapter plate is used to realize the electrical connection between the first pole 12 and the corresponding pole tab. In this way, the electrical connection between the detection pole 14 and the first pole 12 can be realized through the first adapter plate, without the need for additional aluminum wire bonding or conductive wire connection, and the connection mode is simple and reliable.

[0107] The number of the battery unit 1000 can be one, two or more.

[0108] In some embodiments, the number of the battery unit 1000 is at least two, and at least a part of the battery units 1000 are arranged side by side along the first direction W1; and / or, at least a part of the battery units 1000 are arranged side by side along the second direction W2. In this way, the diversity and flexibility of the arrangement of the battery units 1000 can be increased, and the diversity of the battery module can be increased.

[0109] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present disclosure, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the different embodiments or examples described in the present disclosure and the features of the different embodiments or examples can be combined by those skilled in the art without contradiction.

[0110] The above merely provides preferred embodiments of the present disclosure, but not for limiting the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modified, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A battery module, wherein: The invention comprises at least one battery unit, wherein the battery unit comprises a sampling structure and two groups of battery cells, each group of battery cells is formed by stacking a plurality of battery cells along a first direction, and the two groups of battery cells are arranged side by side along a second direction; the first direction and the second direction intersect; The battery cell includes an end cover, a first pole, a second pole and a detection pole provided on the end cover, wherein the second pole is electrically connected to the detection pole; The sampling structure is arranged on the top side of the junction of the two groups of battery cells, the first pole is located at one end of the end cover close to the sampling structure, and the distance from the sampling structure to the detection pole is shorter than the distance from the sampling structure to the second pole; The sampling structure is electrically connected to the first pole and the detection pole of each group of battery cells, respectively, so that the two groups of battery cells share the sampling structure.

2. The battery module according to claim 1, wherein: The sampling structure includes a flexible circuit board.

3. The battery module according to claim 1, wherein: The sampling structure includes a wire harness formed by binding a plurality of wires together.

4. The battery module according to any one of claims 1 to 3, wherein: The two groups of battery cells are arranged symmetrically.

5. The battery module according to any one of claims 1 to 4, wherein: The polarities of the first poles of the two groups of battery cells are the same.

6. The battery module according to any one of claims 1 to 5, wherein: The polarities of the first poles in the same group of battery cells are the same, and the polarities of the first poles in the two groups of battery cells are different.

7. The battery module according to any one of claims 1 to 6, wherein: The detection pole is located between the first pole and the second pole.

8. The battery module according to claim 7, wherein: The second pole, the detection pole, and the first pole are arranged along the same straight line.

9. The battery module according to claim 7 or 8, wherein: The distance from the detection pole to the first pole is smaller than the distance from the detection pole to the second pole.

10. The battery module according to any one of claims 1 to 9, wherein: The battery cell further includes an explosion-proof valve, which is disposed on the end cover and located between the first pole and the second pole. The detection pole is located between the explosion-proof valve and the first pole.

11. The battery module according to claim 10, wherein: The distance from the detection pole to the first pole is smaller than the distance from the detection pole to the explosion-proof valve.

12. The battery module according to any one of claims 1 to 11, wherein: The outer diameter of the detection pole is smaller than the outer diameter of the first pole.

13. The battery module according to any one of claims 1 to 12, wherein: The outer diameter of the detection pole is smaller than the outer diameter of the second pole.

14. The battery module according to any one of claims 1 to 13, wherein: The outer diameter of the first pole is the same as the outer diameter of the second pole.

15. The battery module according to any one of claims 1 to 14, wherein: The protruding height of the detection pole on the end cover is smaller than the protruding height of the first pole on the end cover.

16. The battery module according to any one of claims 1 to 15, wherein: The protruding height of the detection pole on the end cover is smaller than the protruding height of the second pole on the end cover.

17. The battery module according to any one of claims 1 to 16, wherein: The battery unit includes a first adapter plate, and the first pole and the detection pole are electrically connected to the first adapter plate respectively.

18. The battery module according to any one of claims 1 to 17, wherein: The number of the battery cells is at least two, and at least a portion of the battery cells are arranged side by side along the first direction; and / or at least a portion of the battery cells are arranged side by side along the second direction.

19. A battery pack comprising the battery module according to any one of claims 1 to 18.

20. An electrical device comprising the battery module according to any one of claims 1 to 18 or the battery pack according to claim 19.

Images