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 power-consuming device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on Chinese patent application number 202410211209.6, application date February 26, 2024, and invention name “A battery module, battery pack and electrical device”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this disclosure as a reference. Technical Field

[0003] The present disclosure belongs to the field of battery technology, and in particular relates to a battery module, a battery pack and an electrical device. Background Art

[0004] As the electric vehicle industry continues to develop, the packaging technology for electric vehicle power battery systems is also constantly improving. Automation and modularization of power battery system packaging are gradually becoming the mainstream of development. The battery module is particularly important in the power battery system. In related technologies, a sampling structure is installed on the top side of each group of stacked battery cells. The sampling structure is connected to the positive and negative poles of the battery cells through aluminum wire bonding, thereby collecting information such as the battery cell voltage.

[0005] However, this method will increase the difficulty of arranging the sampling structure and the usage of the sampling structure.

[0006] Summary of the Invention

[0007] In view of this, the embodiments of the present disclosure aim to provide a battery module, a battery pack, and an electrical device, aiming to reduce the usage of sampling structures and reduce the difficulty of arranging the sampling structures.

[0008] In a first aspect, an embodiment of the present disclosure provides a battery module, comprising:

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

[0010] 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;

[0011] 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;

[0012] 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.

[0013] The battery module provided by the disclosed embodiments employs a detection electrode electrically connected to the second electrode, and a sampling structure electrically connected to the detection electrode and the first electrode of each group of battery cells, respectively, so that both groups of battery cells share the sampling structure. This reduces the number of sampling structures used. Because the detection electrode is closer to the sampling structure than the second electrode, and the first electrode is also relatively close to the sampling structure, the electrical connection path between the sampling structure and the first and detection electrodes can be shortened, thereby reducing the difficulty of arranging the sampling structure.

[0014] In some embodiments, the sampling structure comprises a flexible printed circuit board. This allows for flexible bending, winding, and folding, allowing for arbitrary arrangement according to spatial layout requirements and the ability to move and extend freely in three dimensions. In a battery module, using a flexible printed circuit board to sample the voltage of each battery cell offers advantages such as low cost, high space utilization, and ease of automated production.

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

[0016] Such an arrangement is conducive to the neat arrangement of battery cells.

[0017] In some embodiments, the polarities of the first electrodes of the two groups of battery cells are the same. This arrangement can facilitate the arrangement of the sampling structure.

[0018] In some embodiments, 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.

[0019] This is beneficial for the battery module to meet the total positive and total negative transmission connection mode.

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

[0021] With such an arrangement, the area between the first pole and the second pole on the end cover can be fully utilized, making it easier to arrange the detection pole.

[0022] In some embodiments, the second pole, the detection pole, and the first pole are arranged along the same straight line, so that the arrangement of the three poles on the end cap is more neat and beautiful.

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

[0024] Such an arrangement brings the detection pole closer to the second pole, further shortening the distance between the detection pole and the sampling structure, thereby facilitating electrical connection between the detection pole and the sampling structure.

[0025] In some embodiments, the battery cell further includes an explosion-proof valve disposed on the end cap, positioned between the first and second poles, and the detection pole positioned between the explosion-proof valve and the first pole. This arrangement allows the detection pole to be closer to the sampling structure, reducing the difficulty of connecting the detection pole to the sampling structure, thereby reducing the difficulty of arranging the sampling structure.

[0026] In some embodiments, the distance between the detection pole and the first pole is smaller than the distance between the detection pole and the explosion-proof valve, so that the detection pole can be close to the sampling structure.

[0027] In some embodiments, the outer diameter of the detection pole is smaller than the outer diameter of the first pole; and / or, the outer diameter of the detection pole is smaller than the outer diameter of the second pole. Thus, the relatively small outer diameter of the detection pole can reduce the impact of the detection pole on the current convergence of the first pole, reduce the impact of the detection pole on the current convergence of the second pole, and also reduce the area occupied by the detection pole on the end cap.

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

[0029] Such an arrangement can reduce the influence of the detection pole on the current confluence of the first pole, and reduce the influence of the detection pole on the current confluence of the second pole.

[0030] In some embodiments, 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.

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

[0032] In some embodiments, 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.

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

[0034] In a second aspect, an embodiment of the present disclosure provides a battery pack, comprising the battery module described in any embodiment of the present disclosure.

[0035] The battery pack provided by the embodiments of the present disclosure, by adopting the battery module mentioned above, can reduce the number of sampling structures used in the battery module and reduce the difficulty of arranging the sampling structures. Furthermore, it can reduce the number of sampling structures used in the battery pack and reduce the difficulty of arranging the sampling structures.

[0036] The power consumption device provided by the embodiments of the present disclosure, by employing the battery module or battery pack described above, can reduce the number of sampling structures used in the battery module and ease the difficulty of arranging the sampling structures. Furthermore, the number of sampling structures used in the battery pack can be reduced, and the difficulty of arranging the sampling structures can be eased. This results in the power consumption device having lower cost and higher reliability.

[0037] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a schematic diagram of a partial structure of a battery module provided in some embodiments of the present disclosure;

[0039] FIG2 is a schematic diagram of an end cap, a first electrode, a second electrode, a detection electrode, and an explosion-proof valve of a battery cell provided in some embodiments of the present disclosure;

[0040] FIG3 is a partial enlarged schematic diagram of point A in FIG2 .

[0041] Description of reference numerals:

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

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] The various specific technical features described in the specific embodiments may be combined in any suitable manner, unless they are inconsistent. For example, different embodiments and technical solutions may be formed by combining different specific technical features. To avoid unnecessary repetition, the various possible combinations of the specific technical features in the present invention will not be described separately.

[0045] In the following description, the terms "first, second, ..." are used solely to distinguish different objects and do not imply any similarities or connections between the objects. It should be understood that the directions "above," "below," "outside," and "inside" refer to directions during normal use. The directions "left" and "right" refer to the left-right directions shown in the corresponding schematic diagrams, which may or may not be the left-right directions during normal use.

[0046] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. "A plurality" means greater than or equal to two.

[0047] Currently, new energy batteries are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in other fields. As the application of power batteries continues to expand, market demand is also growing.

[0048] In related technologies, automation and modularization of power battery system packaging are gradually becoming the mainstream of development. The battery module is particularly important in power battery systems. In related technologies, a sampling structure is installed on the top side of each group of stacked battery cells. The sampling structure is connected to the positive and negative terminals of the battery cells via aluminum wire bonding, thereby collecting information such as the battery cell voltage.

[0049] However, this method will increase the difficulty of arranging the sampling structure and the usage of the sampling structure.

[0050] In view of the above problems, an embodiment of the present disclosure provides a battery module including at least one battery cell.

[0051] The battery unit includes a sampling structure and two groups of battery cells. Each group of battery cells is formed by stacking multiple battery cells along a first direction, and the two groups of battery cells are arranged side by side along a second direction. The first and second directions intersect. The battery cell includes an end cap, a first electrode disposed on the end cap, a second electrode, and a detection electrode, with the second electrode electrically connected to the detection electrode. The sampling structure is disposed on the top side of the junction between the two groups of battery cells, with the first electrode located at the end of the end cap closest to the sampling structure. The distance from the sampling structure to the detection electrode is shorter than the distance from the sampling structure to the second electrode. The sampling structure is electrically connected to the first electrode and the detection electrode of each group of battery cells, respectively, so that the two groups of battery cells share the sampling structure. This reduces the number of sampling structures used. Because the detection electrode is closer to the sampling structure than the second electrode, and the first electrode is also relatively close to the sampling structure, the electrical connection path between the sampling structure and the first and detection electrodes can be shortened, thereby reducing the difficulty of arranging the sampling structure.

[0052] An embodiment of the present disclosure provides a battery pack, which includes the above-mentioned battery module.

[0053] The present disclosure also provides an electrical device comprising the aforementioned battery module or battery pack. The battery module or battery pack can provide electrical energy to the electrical device. The electrical device can include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, and the like. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0054] In the following embodiments, for the convenience of description, an electric vehicle according to an embodiment of the present disclosure is taken as an example.

[0055] The vehicle can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The latter can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. The vehicle is equipped with a battery, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle, for example, as a power source for operation. The vehicle may also include a controller and a motor. The controller controls the battery to power the motor, for example, for starting the vehicle, navigation, and operating power requirements during driving.

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

[0057] An embodiment of the present disclosure provides a battery module. Referring to FIG. 1, the battery module includes at least one battery cell 1000. The battery cell 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. Among them, the first direction W1 and the second direction W2 intersect. Referring to FIG. 2, the battery monomer 100 includes an end cap 11, a first pole 12, a second pole 13, and a detection pole 14 provided on the end cap 11. The second pole 13 is electrically connected to the detection pole 14. The sampling structure 200 is provided on the top side at the junction of the two groups of battery monomers 100. The first pole 12 is located at one end of the end cap 11 close to the sampling structure 200. 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 within the dashed box schematically shows a battery cell 1000. Two dashed boxes are示例性 shown in FIG. 1, that is, two battery cells 1000 are示例性 shown. It can be understood that in the embodiments of the present disclosure, the number of battery cells 1000 is not limited to this, and may 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 cap 11 close to the sampling structure 200, therefore, 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 to say, in the embodiments of the present disclosure, L3 < L2, and L1 < L2.

[0060] Among them, 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 on the side close to the detection pole 14 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 on the side close to the detection pole 14 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 on the side close to the detection pole 14 and the center of the first pole 12.

[0063] A battery cell 100 is the basic device and unit that directly converts chemical energy into electrical energy. It is the fundamental component of a battery. Its components include electrolyte, positive and negative electrodes, and a separator. A battery cell 100 is also the smallest unit of a power battery module. This means that the battery cell is a single unit, without internal series or parallel connections. External electrodes are also directly connected from the battery cell 100.

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

[0065] Exemplarily, a battery cell includes a housing and an electrode assembly. The housing has an opening, the opening is sealed by the end cap 11, and the electrode assembly is disposed within the housing. The housing and the end cap 11 are the exterior structural components of the battery cell.

[0066] The electrode assembly is the component in the battery cell where the electrochemical reaction occurs. One or more electrode assemblies may be contained in the housing. The electrode assembly is mainly formed by winding the electrode sheets (positive and negative sheets), and a separator is usually provided between the positive and negative sheets. The part of the electrode sheets (positive and negative sheets) with active materials constitutes the main body of the electrode assembly, and the main body is connected to the tabs. The positive and negative tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the poles to form a current loop.

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

[0068] One of the first pole 12 and the second pole 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 cap 11 is a component that isolates the internal environment of the battery cell 100 from the external environment. It can be made of a material with a certain degree of hardness and strength (such as aluminum alloy). This prevents the end cap 11 from deforming during compression or collision, thus providing the battery cell 100 with greater structural strength and improved safety.

[0070] The end cap 11 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present disclosure does not impose any particular limitations on this. In some embodiments, an insulating member can be provided on the inner side of the end cap 11 to reduce the risk of short circuits. For example, the insulating member can be plastic, rubber, etc.

[0071] The first pole 12 (or the second pole 13 ) is a component with conductive properties. The first pole 12 (or the second pole 13 ) serves as a current transmission end of the battery cell 100 and is used to transmit current.

[0072] The sampling structure 200 is disposed on the top side of the junction of the two groups of battery cells 100, which means that the sampling structure 200 is arranged generally along the first direction W1 and blocks the arrangement gap between the two groups of battery cells 100. In other words, a portion of the sampling structure 200 along its width direction is located on the top side of one group of battery cells 100, and another portion is located on the top side of the other group of battery cells 100.

[0073] The second pole 13 and the detection pole 14 are electrically connected to each other, which means that the second pole 13 and the detection pole 14 have the same potential. For example, the two poles can be electrically connected by aluminum wire bonding or by an internal adapter.

[0074] The sampling structure 200 is electrically connected to the first electrode 12 and the detection electrode 14 of each group of battery cells 100 respectively. For example, one group of battery cells 100 in a single battery unit 1000 is a first group of battery cells, and the other group of battery cells 100 is a second group of battery cells. The sampling structure 200 is electrically connected to the first electrode 12 and the detection electrode 14 of each battery cell in the first group of battery cells, and is also electrically connected to the first electrode 12 and the detection electrode 14 of each battery cell in the first group of battery cells.

[0075] In the battery module of the disclosed embodiment, the detection electrode 14 is electrically connected to the second electrode 13, and the sampling structure 200 is electrically connected to the detection electrode 14 and the first electrode 12 of each group of battery cells 100. Therefore, the sampling structure 200 is shared by two groups of battery cells 100, thereby reducing the number of sampling structures 200 used. Because the detection electrode 14 is closer to the sampling structure 200 than the second electrode 13, and the first electrode 12 is also relatively close to the sampling structure 200, the electrical connection path between the sampling structure 200 and the first electrode 12 and the detection electrode 14 can be shortened, thereby reducing the difficulty of arranging the sampling structure 200. In other words, the disclosed embodiment saves costs while also reducing the difficulty of arranging the sampling structure 200.

[0076] In the disclosed embodiment, taking rectangular battery cells as an example, the large surfaces of the battery cells in a group are stacked together, and the small surfaces of the battery cells in two groups are arranged together. In other words, the first direction W1 is parallel to the arrangement direction of the large surfaces of the battery cells, and the second direction W2 is parallel to the arrangement direction of the small surfaces of the battery cells.

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

[0078] For example, in some embodiments, the sampling structure 200 includes a flexible printed circuit board (FPC). FPCs are printed circuits made from a flexible insulating substrate and offer numerous advantages, including the ability to bend, wind, and fold freely, be arranged to meet spatial requirements, and be movable and scalable in three dimensions. In a battery module, using FPCs to sample the voltage of each battery cell 100 offers advantages such as low cost, high space utilization, and ease of automated production.

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

[0080] In some embodiments, two groups of battery cells 100 are arranged symmetrically. Symmetrical arrangement can be understood as mirroring one group of battery cells 100 about a symmetry plane to obtain another group of battery cells. Symmetrical arrangement facilitates neat arrangement of the battery cells 1000.

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

[0082] In some embodiments, the polarity of the first electrodes 12 of both groups of battery cells 100 is the same. For example, if the polarity of the first electrodes 12 of one group of battery cells 100 in FIG1 is all positive, the polarity of the first electrodes 12 of the other group of battery cells 100 is also positive. For another example, if the polarity of the first electrodes 12 of one group of battery cells 100 in FIG1 is all negative, the polarity of the first electrodes 12 of the other group of battery cells 100 is also negative. This arrangement can facilitate the arrangement of the sampling structure.

[0083] In some embodiments, the polarity of the first posts 12 in the same group of battery cells 100 is the same, while the polarity of the first posts 12 in two groups of battery cells 100 is different. For example, in FIG1 , the polarity of the first posts 12 in one group of battery cells 100 is all positive, while the polarity of the first posts 12 in the other group of battery cells 100 is all negative. This facilitates the battery module to meet the total positive and total negative transmission connection method.

[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. With such an arrangement, the area between the first pole 12 and the second pole 13 on the end cover 11 can be fully utilized, facilitating 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 statement that the three are arranged along the same straight line means that their centers 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 their arrangement 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 may not be on the same straight line either.

[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, that is, L4 < L6. With such an arrangement, 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] 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. [[ID=IO]]

[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, which is 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 overpressure or overheating problems that may occur in the battery cell 100 under specific circumstances, thereby avoiding the occurrence of explosion accidents 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 closer to the sampling structure 200, reducing the connection difficulty between the detection pole 14 and the sampling structure 200, and further reducing 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 less than the distance L5 from the detection pole 14 to the explosion-proof valve 15, that is, L4 < L5. That is to say, compared with the explosion-proof valve 15, the detection pole 14 is closer to the first pole 12, that is, the detection pole 14 is close to the sampling structure 200.

[0094] Among them, 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 in 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 less than the outer diameter D2 of the first pole 12, that is, D1 < D2; and / or, the outer diameter D1 of the detection pole is less than the outer diameter D3 of the second pole 13, that is, 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 confluence of the first pole 12 and the influence of the detection pole 14 on the current confluence of the second pole 13, and also reduce the occupied area of the detection pole 14 on the end cover 11.

[0097] In some embodiments, the outer diameter D2 of the first pole 12 is the same as the outer diameter D3 of the second pole 13, that is, 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 D3 of the second pole 13 can all be measured by a vernier caliper or a micrometer.

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

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

[0101] The outer diameter D3 of the second pole 13 is: the maximum diameter of the part where the second pole 13 protrudes 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 less than the protruding height H2 of the first pole 12 on the end cover 11, that is, H1 < H2; and / or, the protruding height of the detection pole 14 on the end cover 11 is less than the protruding height of the second pole 13 on the end cover 11. It can reduce the influence of the detection pole 14 on the current confluence of the first pole 12 and the influence of the detection pole 14 on the current confluence of the second pole 13.

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

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

[0106] In some embodiments, the battery cell 1000 includes a first adapter plate, to which the first terminal 12 and the detection terminal 14 are electrically connected. The first adapter plate is used to establish an electrical connection between the first terminal 12 and the corresponding terminal lug. Thus, the first adapter plate can be used to establish an electrical connection between the detection terminal 14 and the first terminal 12, eliminating the need for additional aluminum wire bonding or conductive wire connection, resulting in a simple and reliable connection method.

[0107] The number of battery cells 1000 may be one, two, or more.

[0108] In some embodiments, the number of battery cells 1000 is at least two, with at least a portion of the battery cells 1000 arranged side by side along a first direction W1; and / or at least a portion of the battery cells 1000 arranged side by side along a second direction W2. This increases the diversity and flexibility of the battery cell 1000 arrangement, thereby increasing the diversity of the battery module.

[0109] In the description of the present disclosure, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present disclosure and features of different embodiments or examples without mutual contradiction.

[0110] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection 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.

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