Battery cell assembly, battery module, battery pack and electric device

Abstract

The application discloses a battery cell assembly, a battery module, a battery pack and a power utilization device, and relates to the technical field of batteries. The battery cell assembly comprises a battery cell body, a first electric connecting piece and a power taking structure. In the length direction of the battery cell body, the battery cell body comprises a first end face and a second end face. The first electric connecting piece is connected to the first end face and is electrically connected to the electrode of the battery cell body. The power taking structure is connected to the first end face and is arranged in a spaced manner with the first electric connecting piece. The power taking structure is electrically connected to the first electric connecting piece. The application aims to solve the problem of inconvenient power taking of the battery cell assembly in the battery module.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cell components, battery modules, battery packs and electrical equipment. Background Technology

[0002] The battery pack is one of the main components of new energy vehicles, providing the energy needed for the vehicle to run. A battery pack is usually composed of multiple battery modules, which are made up of multiple battery cells connected in series. In order to accurately control the charging and discharging state of each battery cell, it is necessary to detect the voltage of different numbers of battery cells in the battery module.

[0003] In the existing technology, when detecting the voltage of the cell components in a battery module, it is inconvenient to connect the voltage detection device to the cell components, which affects the connection efficiency between the voltage detection device and the cell components. Utility Model Content

[0004] The purpose of this application is to provide battery cell components, battery modules, battery packs and electrical equipment, with the aim of solving the problem of how to improve the connection efficiency between voltage detection devices and battery cell components.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A first aspect of this application provides a battery cell assembly, comprising a battery cell body, a first electrical connector, and a power-harvesting structure. The battery cell body includes a first end face and a second end face along its length. The first electrical connector is connected to the first end face and electrically connected to an electrode of the battery cell body. The power-harvesting structure is connected to the first end face and spaced apart from the first electrical connector, and is electrically connected to the first electrical connector.

[0007] In the above scheme, the first electrical connector is an electrical connector used for series connection between two adjacent battery cells in the battery module. The power-taking structure is disposed on the first end face of the battery cell and spaced apart from the first electrical connector, so that the power-taking structure is closer to the edge of the first end face of the battery cell relative to the first electrical connector. In this way, when performing voltage detection on the battery cell assembly in the battery module, it can be electrically connected to the voltage detection device through the power-taking structure. The connection is less restricted by space, making it convenient to connect the power-taking structure to the voltage detection device and improving the ease of connection.

[0008] In some embodiments, the first electrical connector includes a first conductive portion and a second conductive portion, the first conductive portion being electrically connected to the electrode, and the second conductive portion being connected between the first conductive portion and the power-taking structure.

[0009] In some embodiments, the second conductive portion is provided with a first connection hole; the power extraction structure passes through the first connection hole.

[0010] In some embodiments, the cell body includes a main body and a first cover plate structure, the main body including a first end face and a second end face; the first cover plate structure is connected to the first end face, and the first electrical connector is disposed between the first cover plate structure and the first end face.

[0011] In some embodiments, the first cover plate structure is provided with a second connection hole, and the power supply structure passes through the second connection hole.

[0012] In some embodiments, the first electrical connector is provided with a first connection hole;

[0013] The power extraction structure includes a conductive post, which includes a first conductive segment and a second conductive segment. The first conductive segment passes through the first connecting hole, and the second conductive segment passes through the second connecting hole.

[0014] In some embodiments, the diameter of the second connecting hole is larger than the diameter of the first connecting hole, and the radial dimension of the second conductive segment is larger than the radial dimension of the first conductive segment.

[0015] In some embodiments, the power extraction structure further includes a first insulating member disposed on the side of the first cover structure opposite to the first electrical connector and extending circumferentially along the second conductive segment.

[0016] In some embodiments, the power extraction structure further includes a first connector connected between the first insulating member and the first cover plate structure.

[0017] In some embodiments, the first connector extends circumferentially along the conductive post, and a portion of the first connector is located within the second connection hole.

[0018] In some embodiments, the power extraction structure further includes a first sealing element, the conductive post passing through the second connection hole, and the first sealing element being disposed between the conductive post and the inner wall surface of the second connection hole.

[0019] In some embodiments, at least a portion of the first seal is located between the inner wall surface of the first connector and the conductive post.

[0020] In some embodiments, the conductive post further includes a limiting protrusion disposed on the side of the first insulating member opposite to the first cover plate structure and extending circumferentially along the second conductive segment.

[0021] In some embodiments, the second conductive segment is provided with a connecting groove, which is located on the side of the limiting protrusion opposite to the first insulating member and extends circumferentially along the second conductive segment.

[0022] In some embodiments, the first cover structure includes a first cover and a first insulating plate, wherein the first insulating plate is disposed between the first cover and the first electrical connector.

[0023] In some embodiments, a second electrical connector is further included, which is connected to the second end face.

[0024] A second aspect of this application provides a battery module including a cell assembly.

[0025] In some embodiments, the number of battery cell assemblies in the battery module is multiple, and the multiple battery cell assemblies include adjacent first battery cell assemblies and second battery cell assemblies;

[0026] The first electrical connector of the first battery cell assembly is electrically connected to the second electrical connector of the second battery cell assembly.

[0027] In some embodiments, the battery module further includes an electrical connection component, which is electrically connected to a first electrical connection of the first cell assembly and a second electrical connection of the second cell assembly.

[0028] In some embodiments, the electrical connection assembly includes a third conductive element and a fourth conductive element, wherein the third conductive element is electrically connected to a first electrical connection element of the first cell assembly, the fourth conductive element is electrically connected to a second electrical connection element of the second cell assembly, and the third conductive element is electrically connected to the fourth conductive element.

[0029] In some embodiments, one of the third conductive element and the fourth conductive element is provided with a plug-in slot, and the other of the third conductive element and the fourth conductive element is plugged into the plug-in slot to make the third conductive element and the fourth conductive element electrically connected.

[0030] In some embodiments, the battery cell body includes a main body and a first cover plate structure, the main body including a first end face and a second end face; the first cover plate structure is connected to the first end face, and the first electrical connector is disposed between the first cover plate structure and the first end face;

[0031] The first cover plate structure is provided with a third connection hole, and the third conductive element passes through the third connection hole of the first cell assembly.

[0032] In some embodiments, the electrical connection assembly further includes a second insulating member disposed on the side of the first cover structure of the first cell assembly opposite to the first electrical connection member, and extending circumferentially along the third conductive member.

[0033] In some embodiments, the electrical connection assembly further includes a second connector connected between the first cover structure of the first cell assembly and the second insulating member.

[0034] In some embodiments, the electrical connection assembly further includes a second seal disposed between the third conductive element and the inner wall surface of the third connection hole.

[0035] A third aspect of this application provides a battery pack, including a cell assembly or a battery module.

[0036] A fourth aspect of this application provides an electrical device that includes a battery cell assembly, a battery module, or a battery pack.

[0037] It should be noted that the technical effects of the implementation methods of the second, third, and fourth aspects can be found in the technical effects of the corresponding implementation methods in the first aspect, and will not be repeated here. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram of the electrical equipment is provided for the embodiments of this application;

[0040] Figure 2 This is a schematic diagram of the structure of two battery cell assemblies connected in an embodiment of this application;

[0041] Figure 3 yes Figure 2 Exploded view diagram;

[0042] Figure 4 for Figure 2 A schematic diagram of the cross-sectional structure;

[0043] Figure 5 for Figure 4 A magnified view of part A in the middle;

[0044] Figure 6 for Figure 5 A magnified view of a portion of point D;

[0045] Figure 7 This is a schematic diagram of the end structure of the battery cell.

[0046] Figure label:

[0047] 100. Vehicle; 10. Vehicle body; 20. Battery cell assembly; 20a. First battery cell assembly; 20b. Second battery cell assembly;

[0048] 1. Battery cell body; 11. Main body; 111. First end face; 112. Second end face; 12. First cover plate structure; 121. Second connecting hole; 122. First cover plate; 123. First insulating plate; 124. Third connecting hole;

[0049] 2. First electrical connector; 21. First conductive part; 22. Second conductive part; 221. First connecting hole;

[0050] 3. Power extraction structure; 31. Conductive post; 311. First conductive segment; 312. Second conductive segment; 313. Limiting protrusion; 314. Connecting groove; 315. First inclined surface; 316. Second inclined surface;

[0051] 32. First insulating component; 33. First connecting component; 34. First sealing component;

[0052] 4. Electrical connector; 41. Third conductive component; 411. Insertion slot; 42. Fourth conductive component; 43. Second insulating component; 44. Second connecting component; 45. Second sealing component;

[0053] 5. Second electrical connection;

[0054] 6. Conductive structure. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0057] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0058] A battery pack is generally a power supply device composed of multiple battery modules, used to provide energy for the operation of electrical equipment. The battery pack is equipped with a battery management system to protect and monitor the batteries, thereby improving safety and operating efficiency. A battery module is generally composed of multiple battery cell components 20 connected in series or parallel. The electrical equipment can be a vehicle 100, a ship, an aircraft, etc. For ease of understanding, this embodiment uses a vehicle 100 as an example for explanation.

[0059] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 100 provided in an embodiment of this application. This application provides a vehicle 100. The vehicle 100 can be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, a range-extended electric vehicle, a gasoline vehicle, etc. The vehicle 100 can also be a sedan, truck, bus, lorry, trailer, etc. This application does not specifically limit the type of vehicle 100.

[0060] The vehicle 100 includes a body 10, which is used to install the equipment and components required for the vehicle 100, such as the engine, seats, etc.

[0061] The vehicle 100 also includes a battery pack connected to the vehicle body 10. The battery pack can provide electrical power to the vehicle 100's motor, air conditioning, refrigerator, and other facilities to ensure the normal operation of the vehicle 100's electrical functions. For example, powering the motor with the battery pack allows the vehicle 100 to move; powering the refrigerator with the battery pack allows it to refrigerate drinks for passengers; and powering the air conditioning with the battery pack allows it to regulate the interior temperature, improving the passenger experience.

[0062] In some embodiments, see Figure 2 and Figure 4 , Figure 2 This is a schematic diagram of the structure of the battery module in the battery pack provided in the embodiments of this application. Figure 4 for Figure 2 Cross-sectional structural diagram. The battery pack includes battery modules. The battery pack may include one battery module or multiple battery modules.

[0063] The battery module may include multiple cell assemblies 20. The multiple cell assemblies 20 are arranged sequentially along the length of the cell assembly 20, and adjacent cell assemblies 20 are connected in series. Each cell assembly 20 includes a cell body 1, a first electrical connector 2, and a power extraction structure 3.

[0064] In some examples, the cell body 1 may contain an electrolyte and electrodes, including a positive electrode and a negative electrode. The electrolyte, as a conductive medium, works together with the positive and negative electrodes to carry out the redox reaction.

[0065] In some examples, a first electrical connector 2 in a cell assembly 20 is used to electrically connect with the cell body 1 in an adjacent cell assembly 20, thereby enabling current transmission between two adjacent cell assemblies 20.

[0066] In some examples, the power-taking structure 3 is connected to the cell body 1 for connection with a voltage detection device, so that the voltage detection device is electrically connected to the cell body 1 through the power-taking structure 3, thereby measuring the voltage value of the cell body 1.

[0067] Specifically, when it is necessary to detect the voltage of multiple battery cell assemblies 20 connected in sequence in a battery module, the two battery cell assemblies 20 located at both ends of these multiple connected battery cell assemblies 20 are respectively named the first detection battery cell assembly 20 and the second detection battery cell assembly 20. During detection, one detection terminal of the voltage detection device can be electrically connected to the power extraction structure 3 of the first detection battery cell assembly 20, and the other detection terminal of the voltage detection device can be electrically connected to the power extraction structure 3 of the second detection battery cell assembly 20 to form a closed circuit, thereby detecting the voltage.

[0068] In some embodiments, along the length direction of the cell body 1, the cell body 1 includes a first end face 111 and a second end face 112. A first electrical connector 2 is connected to the first end face 111 and is electrically connected to the electrodes of the cell body 1. The first electrical connector 2 can be electrically connected to either the positive or negative electrode of the cell body 1.

[0069] It should be understood that the first electrical connector 2 is made of a conductive material, which may be copper or aluminum, or a composite of copper and aluminum.

[0070] To facilitate voltage measurement, in this embodiment, the power taking structure 3 is connected to the first end face 111 of the battery cell body 1 and is spaced apart from the first electrical connector 2. The power taking structure 3 is electrically connected to the first electrical connector 2.

[0071] In some examples, the power-taking structure 3 is a conductive element. Since the first electrical connector 2 is used for current transmission between the two cell assemblies 20, after the first electrical connector 2 is connected to the power-taking structure 3, the current of the cell body 1 can be output to the power-taking structure 3. The voltage of the cell assembly 20 can be measured through the power-taking structure 3.

[0072] It should be noted that, for reference Figure 2 , Figure 3 , Figure 4 , Figure 7The battery module in the battery pack may also include end cells, with multiple cell assemblies 20 disposed on one side of the end cell along its length. The end cell may be provided with a conductive structure 6, but may not be provided with a power extraction structure 3.

[0073] When the end cell does not have a power extraction structure 3, if the end cell is used as the first detection cell assembly 20, one detection terminal of the voltage detection device can be electrically connected to the electrode of the end cell facing away from the cell assembly 20.

[0074] In the above scheme, the first electrical connector 2 is an electrical connector used for connecting two adjacent cell bodies 1 in series in the battery module, and is usually located in the middle of the first end face 111. In this application, the power taking structure 3 is located on the first end face 111 of the cell body 1 and is spaced apart from the first electrical connector 2, so that the power taking structure 3 is closer to the edge of the first end face 111 of the cell body 1. In this way, it is convenient to connect the power taking structure 3 to the voltage detection device, improving the convenience of connection.

[0075] In some embodiments, see Figure 5 The first electrical connector 2 includes a first conductive part 21 and a second conductive part 22. The first conductive part 21 is electrically connected to the electrode, and the second conductive part 22 is connected between the first conductive part 21 and the power taking structure 3.

[0076] In some examples, the first conductive portion 21 and the second conductive portion 22 can be an integral structure. Alternatively, the first conductive portion 21 and the second conductive portion 22 can be separate structures connected by welding or other methods.

[0077] In some examples, the connection between the first conductive portion 21 and the electrode can be abutting contact or a welded connection.

[0078] In some examples, the first conductive portion 21 is electrically connected to the positive electrode in the electrode.

[0079] In other examples, the first conductive portion 21 is electrically connected to the negative electrode in the electrode.

[0080] In this embodiment, the power extraction structure 3 is connected to the electrode through the second conductive part 22 and the first conductive part 21, so that the voltage at the power extraction structure 3 is consistent with the voltage at the electrode, thereby improving the accuracy of the power extraction value.

[0081] In some embodiments, the second conductive portion 22 is provided with a first connection hole 221, and the power-taking structure 3 passes through the first connection hole 221. In this embodiment, the power-taking structure 3 and the second conductive portion 22 are connected through the first connection hole 221, which improves the convenience and stability of the connection.

[0082] In some examples, the first connecting hole 221 can be a first circular hole, and the power-taking structure 3 has a first cylinder that is inserted into the first circular hole. The first cylinder and the first circular hole can be fitted with a clearance fit and then fixed by welding or other methods; alternatively, an interference fit can be used, resulting in a more stable connection between the power-taking structure 3 and the second conductive part 22 after insertion.

[0083] In some examples, the first electrical connection structure can be a sheet-like structure, a rod-like structure, an irregular structure, etc.

[0084] In some examples, the first conductive portion 21 and the second conductive portion 22 can be a sheet-like mechanism, a rod-like structure, etc.

[0085] In some examples, the length of the second conductive portion 22 is greater than the length of the first conductive portion 21. A portion of the second conductive portion 22 and the first conductive portion 21 are stacked. This allows for a more stable connection between the first conductive portion 21 and the second conductive portion 22, resulting in more stable current transmission.

[0086] In some embodiments, the battery cell body 1 includes a main body 11 and a first cover plate structure 12. The main body 11 includes a first end face 111 and a second end face 112. The first cover plate structure 12 is connected to the first end face 111, and a first electrical connector 2 is disposed between the first cover plate structure 12 and the first end face 111.

[0087] By placing the first electrical connector 2 between the first cover plate structure 12 and the first end face 111, the first cover plate structure 12 can protect the first electrical connector 2 to avoid damage to the first electrical connector 2 or the occurrence of leakage hazard.

[0088] In some examples, the first cover plate structure 12 and the first end face 111 of the main body 11 are fixedly connected by welding. The first electrical connector 2 is disposed between the first cover plate structure 12 and the first end face 111, that is, the first electrical connector 2 is fixedly clamped between the two, which improves the connection stability between the first electrical connector 2 and the battery cell body 1.

[0089] In some other examples, the first cover plate structure 12 and the cell body 1 of the main body 11 can be connected by means of screwing, riveting or other methods.

[0090] In some embodiments, the first cover plate structure 12 is provided with a second connection hole 121, through which the power-taking structure 3 passes. In this embodiment, the power-taking structure 3 passes through the second connection hole 121 of the first cover plate structure 12, which has higher connection stability compared to being connected to the surface of the first cover plate structure 12.

[0091] In some examples, the second connecting hole 121 is connected to the first connecting hole 221. The first connecting hole 221 and the second connecting hole 121 can provide a better limiting effect on the power supply structure 3, thereby improving the connection stability of the power supply structure 3.

[0092] In some examples, the second connecting hole 121 can be a second circular hole that penetrates the first cover plate structure 12, through which the power-taking structure 3 passes and connects to the second conductive part 22. Since the power-taking structure 3 passes through the first cover plate structure 12, the second circular hole of the first cover plate structure 12 provides support for the power-taking structure 3, so that the power-taking structure 3 still has good stability when subjected to tension or other conditions.

[0093] In some embodiments, see Figure 6 The first electrical connector 2 is provided with a first connection hole 221. The power extraction structure 3 includes a conductive post 31, which includes a first conductive segment 311 and a second conductive segment 312. The first conductive segment 311 passes through the first connection hole 221, and the second conductive segment 312 passes through the second connection hole 221.

[0094] In this way, the conductive post 31 can be limited and connected at different positions through the first connecting hole 221 and the second connecting hole 121, thereby improving the stability of the connection between the conductive post 31 and the battery cell body 1.

[0095] In some examples, the first conductive segment 311 is adapted to the size of the first connecting hole 221, and the second conductive segment 312 is adapted to the size of the second connecting hole 121.

[0096] In some examples, the diameter of the first conductive segment 311 is not equal to the diameter of the second conductive segment 312.

[0097] By using different diameters for the first conductive segment 311 and the second conductive segment 312, and different diameters for the first connecting hole 221 and the second connecting hole 121, a locking structure is formed between the first conductive segment 311 and the second connecting hole 121 or between the second conductive segment 312 and the first connecting hole 221, thereby limiting the conductive post 31 and controlling the exposed length of the conductive post 31 to facilitate electrical connection.

[0098] In some embodiments, the diameter of the second connecting hole 121 is larger than the diameter of the first connecting hole 221, and the radial dimension of the second conductive segment 312 is larger than the radial dimension of the first conductive segment 311. This creates a stepped surface at the transition between the first conductive segment 311 and the second conductive segment 312. When the first conductive segment 311 is inserted into the first connecting hole 221, the stepped surface contacts and limits the second conductive portion 22 on the side facing the second connecting hole 121, preventing the second conductive segment 312 from being inserted into the first connecting hole 221. By limiting the insertion depth of the conductive post 31 through the stepped surface, the exposed length of the second conductive segment 312 relative to the first cover plate structure 12 is effectively guaranteed, facilitating power extraction.

[0099] In other embodiments, the diameter of the first conductive segment 311 is smaller than the diameter of the second conductive segment 312, the diameter of the first connecting hole 221 is smaller than the diameter of the second connecting hole 121, and the diameter of the second conductive segment 312 is larger than the diameter of the first connecting hole 221.

[0100] In some embodiments, see Figure 3 , Figure 5 , Figure 6 The power-taking structure 3 also includes a first insulating member 32, which is disposed on the side of the first cover structure 12 opposite to the first electrical connector 2 and extends circumferentially along the second conductive segment 312. By providing the first insulating member 32 in the power-taking structure 3, the exposed area of ​​the power-taking structure 3 is reduced, preventing the power-taking structure 3 from accidentally contacting other components and causing leakage problems, thereby improving safety.

[0101] In some examples, the first insulating element 32 can be a plastic or ceramic component. The first insulating element 32 can be a square cylindrical structure, a cylindrical structure, etc.

[0102] In some specific examples, the first insulating component 32 is a ceramic component, which is sleeved on the outside of the conductive post 31 of the power-taking structure 3. By shielding part of the outer cylindrical surface of the conductive post 31 with the ceramic component, problems such as leakage caused by accidental contact between other components and the conductive post 31 are effectively prevented, thereby improving safety performance.

[0103] In some embodiments, the power extraction structure 3 further includes a first connector 33, which is connected between the first insulating member 32 and the first cover plate structure 12. This embodiment facilitates the connection between the first insulating member 32 and the first cover plate structure 12 by providing the first connector 33 between them.

[0104] Specifically, the first insulating element 32 and the first cover plate structure 12 can be welded together. A stable connection between the first insulating element 32 and the first cover plate structure 12 is achieved by welding the first connecting element 33 to both the first insulating element 32 and the first cover plate structure 12. It should be noted that when the first insulating element 32 is made of ceramic material, direct welding between the first insulating element 32 and the first cover plate structure 12 is not convenient.

[0105] In some embodiments, the first connector 33 extends circumferentially along the conductive post 31, and a portion of the first connector 33 is located within the second connecting hole 121. Since the first connector 33 primarily serves as an intermediary connecting the first insulator 32 to the first cover structure 12, placing a portion of the first connector 33 within the second connecting hole 121 allows for limiting and fixing of the first connector 33, thereby increasing the stability of the connection between the first connector 33 and the first cover structure 12. Furthermore, placing a portion of the first connector 33 within the second connecting hole 121 allows for greater coverage of the power-gathering structure 3 by the first insulator 32, effectively increasing the insulation area of ​​the power-gathering structure 3, preventing accidental contact between the power-gathering structure 3 and other components that could cause leakage, and improving safety performance.

[0106] In some specific examples, a countersunk hole is provided on the side of the first cover plate structure 12 near the first insulating member 32. The countersunk hole is coaxially arranged with the second connecting hole 121. Placing part of the volume of the first connecting member 33 in the length direction in the countersunk hole can effectively reduce the exposed area of ​​the first connecting member 33, so that the first insulating member 32 covers more of the power taking structure 3, preventing the power taking structure 3 from accidentally contacting other components and causing leakage, thus improving safety performance.

[0107] In some embodiments, see Figure 6 The power extraction structure 3 also includes a first sealing element 34. The conductive post 31 passes through the second connection hole 121, and the first sealing element 34 is disposed between the conductive post 31 and the inner wall surface of the second connection hole 121. By providing the first sealing element 34 between the conductive post 31 and the second connection hole 121, the sealing performance of the battery cell assembly 20 is effectively improved, preventing liquids such as water from entering the battery cell assembly 20 through the power extraction structure 3 and causing short circuits or other problems, thereby improving the safety performance of the battery cell assembly 20.

[0108] In some examples, the first seal 34 can be an O-ring or a rectangular seal.

[0109] In some examples, the first seal 34 is fitted onto the conductive post 31 and simultaneously presses against the inner wall of the second connection hole 121 to seal.

[0110] In other examples, the first seal 34 may also be a sealant, etc. This application does not specifically limit this.

[0111] In some embodiments, at least a portion of the first seal 34 is located between the inner wall surface of the first connector 33 and the conductive post 31. This allows the first seal 34 to seal the gap between the inner wall surface of the first connector 33 and the conductive post 31, further improving the safety performance of the battery cell assembly 20.

[0112] For example, the inner wall surface of the first connector 33 and the conductive post 31 both abut against the first seal 34. The inner wall surface of the first connector 33 compresses the first seal 34, causing the first seal 34 to be embedded between the second connecting hole 121 and the conductive post 31 to form a seal. The first connector 33 provides a stable compressive force to the first seal 34, improving the sealing stability of the first seal 34.

[0113] In some examples, the first connector 33 is sleeved on the outside of the first seal 34, and the inner wall of the first connector 33 applies pressure to the first seal 34. The first seal 34, which is deformed by compression, is embedded between the inner wall of the conductive post 31 and the second connection hole 121, and seals the gap between the conductive post 31 and the second connection hole 121.

[0114] In some embodiments, see Figure 6 The conductive post 31 also includes a limiting protrusion 313, which is located on the side of the first insulating member 32 facing away from the first cover plate structure 12 and extends circumferentially along the second conductive segment 312. By providing the limiting protrusion 313, the first insulating member 32 can be limited from the side of the first insulating member 32 facing away from the first cover plate 122, so that the first insulating member 32 is more stable on the power taking structure 3.

[0115] For example, the limiting protrusion 313 can abut against the first insulating member 32. By abutting the first insulating member 32 with the limiting protrusion 313, the first insulating member 32 is limited, preventing the first insulating member 32 from dislodging from the conductive post 31 and facilitating assembly.

[0116] In some examples, the limiting protrusion 313 can be an annular boss. The outer diameter of the annular boss is larger than the inner diameter of the first insulating member 32, but smaller than the outer diameter of the first insulating member 32, so that the annular boss abuts against the end face of the first insulating member 32 and plays a positioning role for the first insulating member 32.

[0117] In some examples, the limiting protrusion 313 consists of multiple protrusions distributed circumferentially along the second conductive segment 312. By having multiple protrusions abut against the end face of the first insulating member 32, the first insulating member 32 is limited, thereby improving the stability of the structural connection.

[0118] In some examples, the connection between the limiting protrusion 313 and the first insulating member 32 can be achieved by abutment, welding, bonding, or other methods.

[0119] In some embodiments, see Figure 6 The second conductive segment 312 is provided with a connecting groove 314, which is located on the side of the limiting protrusion 313 opposite to the first insulating member 32 and extends circumferentially along the second conductive segment 312. By providing the connecting groove 314 in the second conductive segment 312, during voltage detection, the detection end of the voltage detection device can be connected in the connecting groove 314 to facilitate the connection between the voltage detection device and the power extraction structure 3 when power is extracted, thereby improving the convenience of connection.

[0120] In some examples, the cross-sectional shape of the connecting groove 314 can be semi-circular, square, etc., wherein the cross-section is located on the axis of the power taking structure 3.

[0121] In some examples, the connecting groove 314 is an annular groove disposed on the second conductive segment 312. Along the axial direction of the second conductive segment 312, the inner walls on both sides of the connecting groove 314 are respectively provided with a first inclined surface 315 and a second inclined surface 316, wherein the inclination direction of the first inclined surface 315 and the second inclined surface 316 is such that the diameter of the end of the first inclined surface 315 and the second inclined surface 316 away from the outer peripheral surface of the second conductive segment 312 is smaller than the diameter of the end of the first inclined surface 315 and the second inclined surface 316 close to the outer peripheral surface of the second conductive segment 312.

[0122] In this way, when other connectors are placed on the first inclined surface 315 or the second inclined surface 316, they automatically slide into the position of the connecting groove 314 through the inclination direction of the first inclined surface 315 and the second inclined surface 316. The connecting groove 314 connects with the corresponding component, improving the stability of the connection and preventing it from being dislodged from the conductive post 31 due to external interference.

[0123] In some embodiments, see Figure 3 , Figure 5 The first cover structure 12 includes a first cover 122 and a first insulating plate 123, with the first insulating plate 123 disposed between the first cover 122 and the first electrical connector 2. By providing the first insulating plate 123 between the first cover 122 and the first electrical connector 2, end leakage of the battery cell assembly 20 is effectively prevented, thus improving safety performance.

[0124] In some examples, the first insulating plate 123 may be made of insulating materials such as plastic or ceramic.

[0125] In some embodiments, refer to Figure 3 The cell assembly 20 also includes a second electrical connector 5, which is connected to the second end face 112. The second electrical connector 5 is used to electrically connect with the first electrical connector 2 in another cell assembly 20, so as to facilitate electrical connection between two adjacent cell assemblies 20.

[0126] In one battery cell assembly 20, one of the first electrical connector 2 and the second electrical connector 5 is electrically connected to the positive electrode of the battery cell body 1, and the other of the first electrical connector 2 and the second electrical connector 5 is electrically connected to the negative electrode of the battery cell body 1.

[0127] In some instances, the second electrical connector 5 may have the same structure as the first electrical connector 2, which will not be described in detail here.

[0128] In some examples, the second electrical connector 5 has a different structure from the first electrical connector 2, the difference being that the second electrical connector 5 is not connected to the power-taking structure 3, and therefore does not have a second conductive part 22.

[0129] In some embodiments, the battery module includes a plurality of cell assemblies 20. See also Figure 2 , Figure 4 The plurality of battery cell assemblies 20 include adjacent first battery cell assembly 20a20 and second battery cell assembly 20b20. The first electrical connector 2 of the first battery cell assembly 20a20 is electrically connected to the second electrical connector 5 of the second battery cell assembly 20b20.

[0130] In some examples, multiple cell assemblies 20 in the battery module are connected in series. The voltage of the battery module can be adjusted by changing the number of cell assemblies 20, allowing it to be used in both low-voltage and high-voltage electrical devices, thus expanding its application range.

[0131] In some embodiments, see Figure 2 , Figure 4 The battery module also includes an electrical connection component 4, which is electrically connected to the first electrical connector 2 of the first cell assembly 20a20 and the second electrical connector 5 of the second cell assembly 20b20. By connecting the first electrical connector 2 of one adjacent cell assembly 20 to the second electrical connector 5 of the other, the electrical connection component 4 eliminates the need for pre-reserved wiring space compared to commonly used external wiring series structures. This results in a simpler, more compact structure, easier connection, and improved energy density of the battery module.

[0132] In some examples, the electrical connection assembly 4 includes a cylindrical conductive element that passes through a cover structure at the end of the cell assembly 20 and connects between a first electrical connection 2 of one cell assembly 20 and a second electrical connection 5 of another cell assembly 20. This simple structure allows for a compact arrangement of adjacent cell assemblies 20, improving the energy density of the battery module.

[0133] In some embodiments, see Figure 3 , Figure 5The electrical connection assembly 4 includes a third conductive element 41 and a fourth conductive element 42. The third conductive element 41 is electrically connected to the first electrical connector 2 of the first cell assembly 20a20, and the fourth conductive element 42 is electrically connected to the second electrical connector 5 of the second cell assembly 20b20. The third conductive element 41 is also electrically connected to the fourth conductive element 42. That is, the electrical connection assembly 4 consists of separate third conductive elements 41 and 42. Specifically, the third conductive element 41 is connected to the first electrical connector 2, and the fourth conductive element 42 is connected to the second electrical connector 5. Since the positive and negative electrodes of the cell assembly 20 are made of different materials, the third conductive element 41 can be made of the same material as the first electrical connector 2, and the fourth conductive element 42 can be made of the same material as the second electrical connector 5. This reduces the resistance at the connection point between the electrical connection assembly 4 and the cell assembly 20, thereby improving conductivity.

[0134] In some examples, the first electrical connector 2 is the positive electrode of the cell assembly 20 and is made of aluminum; the second electrical connector 5 is the negative electrode of the cell assembly 20 and is made of copper. In this case, the third conductive element 41 is made of aluminum and the fourth conductive element is made of copper.

[0135] In some examples, the first electrical connector 2 is the negative electrode of the cell assembly 20 and is made of copper; the second electrical connector 5 is the positive electrode of the cell assembly 20 and is made of aluminum. In this case, the third conductive element 41 is made of copper and the fourth conductive element 42 is made of aluminum.

[0136] In some examples, the third conductive element 41 and the fourth conductive element 42 can be connected by plug-in, welding or other connection methods.

[0137] In some embodiments, one of the third conductive element 41 and the fourth conductive element 42 is provided with a plug-in groove 411, and the other of the third conductive element 41 and the fourth conductive element 42 is plugged into the plug-in groove 411 to make the third conductive element 41 and the fourth conductive element 42 electrically connected. The third conductive element 41 and the fourth conductive element 42 are connected by plugging, and the connection structure is simple. After plugging, the two ends of the third conductive element 41 and the fourth conductive element 42 respectively abut against the first electrical connector 2 and the second electrical connector 5, making it difficult for them to have axial displacement, thus stabilizing the connection structure and improving the stability of conductivity.

[0138] In some examples, see Figure 5 The third conductive element 41 is provided with a plug-in slot 411, and the fourth conductive element 42 is plugged into the plug-in slot 411 of the third conductive element 41.

[0139] In some examples, the fourth conductive element 42 is provided with a plug slot 411, and the third conductive element 41 is plugged into the plug slot 411 of the fourth conductive element 42.

[0140] In some examples, the third conductive element 41 and the fourth conductive element 42 can be columnar structures, plate-like structures, block-like structures, etc.

[0141] In some embodiments, the battery cell body 1 includes a main body 11 and a first cover plate structure 12. The main body 11 includes a first end face 111 and a second end face 112. The first cover plate structure 12 is connected to the first end face 111, and a first electrical connector 2 is disposed between the first cover plate structure 12 and the first end face 111. The first cover plate structure 12 is provided with a third connection hole 124, and a third conductive member 41 passes through the third connection hole 124 of the first battery cell assembly 20a20. The third conductive member 41 passes through the third connection hole 124 of the first cover plate structure 12 and is connected to the first electrical connector 2. The hole wall of the third connection hole 124 provides support for the third conductive member 41, effectively preventing the third conductive member 41 from detaching from the first electrical connector 2 due to external forces, and improving connection stability.

[0142] In some examples, the first cover plate structure 12 has a through-hole, namely the third connecting hole 124, through which a section of the third conductive element 41 passes and connects to the first electrical connector 2. In this case, the third conductive element 41 is embedded in the hole, and the hole wall provides circumferential support for the third conductive element 41, preventing the third conductive element 41 from becoming skewed or detached from the first electrical connector 2 due to external forces.

[0143] In some embodiments, see Figure 3 , Figure 5 The electrical connection assembly 4 also includes a second insulating member 43, which is disposed on the side of the first cover structure 12 of the first cell assembly 20a20 opposite to the first electrical connection member 2 and extends circumferentially along the third conductive member 41. By providing the second insulating member 43 in the electrical connection assembly 4, the exposed area of ​​the electrical connection assembly 4 is reduced, preventing the electrical connection assembly 4 from accidentally contacting other components and causing problems such as leakage.

[0144] In some examples, the second insulating element 43 may be a plastic or ceramic element.

[0145] In some specific examples, the second insulating element 43 is a ceramic element, which is sleeved on the outside of the third conductive element 41 and / or the fourth conductive element 42. By shielding the outside of the third conductive element 41 and / or the fourth conductive element 42 with the ceramic element, problems such as leakage caused by accidental contact between other components and the electrical connection assembly 4 are effectively prevented, thereby improving safety performance.

[0146] In some embodiments, the electrical connection assembly 4 further includes a second connector 44, which connects the first cover structure 12 of the first cell assembly 20a20 to the second insulating member 43. When the second insulating member 43 is made of ceramic material, it is inconvenient to connect the second insulating member 43 to the first cover structure 12. This embodiment facilitates the connection between the second insulating member 43 and the first cover structure 12 by providing a second connector 44 between the second insulating member 43 and the first cover structure 12.

[0147] Specifically, the second insulating element 43 and the first cover plate structure 12 can be welded together. A stable connection between the second insulating element 43 and the first cover plate structure 12 is achieved by welding the second connecting element 44 to both the second insulating element 43 and the first cover plate structure 12.

[0148] In some examples, the second connector 44 can be a cylindrical structure, a plate structure, etc.

[0149] In some examples, there are two second connectors 44, which are respectively placed on both sides of the second insulator 43, and are used to connect the second insulator 43 to the cover structure of the first cell assembly 20a20 and the cover structure of the second cell assembly 20b20.

[0150] In some embodiments, the electrical connection assembly 4 further includes a second sealing element 45, which is disposed between the third conductive element 41 and the inner wall surface of the third connection hole 124. By providing the second sealing element 45 between the third conductive element 41 and the third connection hole 124, the sealing performance of the battery cell assembly 20 is effectively improved, preventing liquids such as water from entering the battery cell assembly 20 through the electrical connection assembly 4 and causing problems such as short circuits, thereby improving the safety performance of the battery cell assembly 20.

[0151] In some examples, the second seal 45 can be an O-ring or a rectangular seal. In other examples, the second seal 45 can be a sealant, etc.

[0152] In some examples, the first seal 34 is fitted onto the third conductive element 41 and simultaneously presses against the inner wall of the third connection hole 124 to seal.

[0153] In some examples, there are two second seals 45, which are respectively disposed on both sides of the second insulator 43, for sealing the electrical connection assembly 4 with the first cell assembly 20a20 and the second cell assembly 20b20 respectively.

[0154] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell assembly, characterized in that, include: The battery cell body (1) includes a first end face (111) and a second end face (112) along the length direction of the battery cell body (1); The first electrical connector (2) is connected to the first end face (111) and is electrically connected to the electrode of the battery cell body (1); A power-taking structure (3) is connected to the first end face (111) and is spaced apart from the first electrical connector (2). The power-taking structure (3) is electrically connected to the first electrical connector (2).

2. The battery cell assembly according to claim 1, characterized in that, The first electrical connector (2) includes a first conductive part (21) and a second conductive part (22). The first conductive part (21) is electrically connected to the electrode, and the second conductive part (22) is connected between the first conductive part (21) and the power extraction structure (3).

3. The cell assembly according to claim 2, characterized in that, The second conductive part (22) is provided with a first connection hole (221); the power taking structure (3) passes through the first connection hole (221).

4. The cell assembly according to any one of claims 1-3, characterized in that, The battery cell body (1) includes: The main body (11) includes a first end face (111) and a second end face (112); A first cover plate structure (12) is connected to the first end face (111), and the first electrical connector (2) is disposed between the first cover plate structure (12) and the first end face (111).

5. The cell assembly according to claim 4, characterized in that, The first cover plate structure (12) is provided with a second connection hole (121), and the power supply structure (3) passes through the second connection hole (121).

6. The cell assembly according to claim 5, characterized in that, The first electrical connector (2) is provided with a first connection hole (221); The power extraction structure (3) includes a conductive post (31), which includes a first conductive segment (311) and a second conductive segment (312). The first conductive segment (311) passes through the first connecting hole (221), and the second conductive segment (312) passes through the second connecting hole (121).

7. The cell assembly according to claim 6, characterized in that, The diameter of the second connecting hole (121) is larger than that of the first connecting hole (221), and the radial dimension of the second conductive segment (312) is larger than that of the first conductive segment (311).

8. The cell assembly according to claim 6, characterized in that, The power extraction structure (3) further includes a first insulating member (32), which is disposed on the side of the first cover structure (12) opposite to the first electrical connector (2) and extends circumferentially along the second conductive segment (312).

9. The cell assembly according to claim 8, characterized in that, The power extraction structure (3) further includes a first connector (33), which is connected between the first insulating member (32) and the first cover plate structure (12).

10. The cell assembly according to claim 9, characterized in that, The first connector (33) extends circumferentially along the conductive post (31), and a portion of the first connector (33) is located within the second connection hole (121).

11. The cell assembly according to claim 10, characterized in that, The power extraction structure (3) further includes a first sealing element (34), the conductive post (31) passes through the second connecting hole (121), and the first sealing element (34) is disposed between the conductive post (31) and the inner wall surface of the second connecting hole (121).

12. The cell assembly according to claim 11, characterized in that, At least a portion of the first seal (34) is located between the inner wall surface of the first connector (33) and the conductive post (31).

13. The cell assembly according to claim 8, characterized in that, The conductive post (31) also includes a limiting protrusion (313), which is located on the side of the first insulating member (32) opposite to the first cover plate structure (12) and extends circumferentially along the second conductive segment (312).

14. The cell assembly according to claim 13, characterized in that, The second conductive segment (312) is provided with a connecting groove (314), which is located on the side of the limiting protrusion (313) opposite to the first insulating member (32) and extends circumferentially along the second conductive segment (312).

15. The cell assembly according to claim 4, characterized in that, The first cover plate structure (12) includes a first cover plate (122) and a first insulating plate (123), wherein the first insulating plate (123) is disposed between the first cover plate (122) and the first electrical connector (2).

16. The cell assembly according to any one of claims 1-3, characterized in that, It also includes a second electrical connector (5), which is connected to the second end face (112).

17. A battery module, characterized in that, The battery cell assembly includes any one of claims 1-16.

18. The battery module according to claim 17, characterized in that, The number of battery cell assemblies is multiple, and the multiple battery cell assemblies include adjacent first battery cell assembly (20a) and second battery cell assembly (20b); The first electrical connector (2) of the first battery cell assembly (20a) is electrically connected to the second electrical connector (5) of the second battery cell assembly (20b).

19. The battery module according to claim 18, characterized in that, It also includes an electrical connection component (4), which is electrically connected to the first electrical connection (2) of the first cell assembly (20a) and the second electrical connection (5) of the second cell assembly (20b).

20. The battery module according to claim 19, characterized in that, The electrical connection assembly (4) includes a third conductive element (41) and a fourth conductive element (42). The third conductive element (41) is electrically connected to the first electrical connection element (2) of the first battery cell assembly (20a), and the fourth conductive element (42) is electrically connected to the second electrical connection element (5) of the second battery cell assembly (20b). The third conductive element (41) is electrically connected to the fourth conductive element (42).

21. The battery module according to claim 20, characterized in that, One of the third conductive element (41) and the fourth conductive element (42) is provided with a plug-in slot (411), and the other of the third conductive element (41) and the fourth conductive element (42) is plugged into the plug-in slot (411) so that the third conductive element (41) and the fourth conductive element (42) are electrically connected.

22. The battery module according to claim 20, characterized in that, The battery cell body (1) includes a main body (11) and a first cover plate structure (12). The main body (11) includes a first end face (111) and a second end face (112). The first cover plate structure (12) is connected to the first end face (111), and the first electrical connector (2) is disposed between the first cover plate structure (12) and the first end face (111). The first cover plate structure (12) is provided with a third connection hole (124), and the third conductive element (41) passes through the third connection hole (124) of the first battery cell assembly (20a).

23. The battery module according to claim 22, characterized in that, The electrical connection assembly (4) further includes a second insulating member (43), which is disposed on the side of the first cover structure (12) of the first cell assembly (20a) opposite to the first electrical connection member (2) and extends circumferentially along the third conductive member (41).

24. The battery module according to claim 23, characterized in that, The electrical connection assembly (4) further includes a second connector (44) which is connected between the first cover structure (12) of the first cell assembly (20a) and the second insulating member (43).

25. The battery module according to claim 22, characterized in that, The electrical connection assembly (4) further includes a second seal (45), which is disposed between the third conductive element (41) and the inner wall surface of the third connection hole (124).

26. A battery pack, characterized in that, It includes the cell assembly according to any one of claims 1-16, or the battery module according to any one of claims 17-25.

27. An electrical appliance, characterized in that, It includes the cell assembly according to any one of claims 1-16, or the battery module according to any one of claims 17-25, or the battery pack according to claim 26.

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