Battery cell, battery module and electric device

Abstract

A battery cell (100), comprising: a casing (1), a core (2), a first terminal post (3), a second terminal post (4) and an electrical connector (5), wherein the core (2) is arranged in the casing (1); the first terminal post (3) and the second terminal post (4) are both electrically connected to the core (2), and the first terminal post (3) and the second terminal post (4) are insulated from the casing (1); and the electrical connector (5) is arranged on the casing (1) and is electrically connected to the casing (1), and the electrical connector (5) is electrically connected to the first terminal post (3).

Description

Battery cells, battery modules and electrical equipment

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202422108666.0, filed on August 28, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of battery technology, and in particular to a battery cell, a battery module, and an electrical device. Background Technology

[0004] In related technologies, a single battery cell includes a casing and a battery cell housed within the casing. The battery cell is connected to a positive terminal and a negative terminal. To prevent corrosion of the casing by the electrolyte, a conductive rubber ring is typically fitted onto the positive or negative terminal. This conductive rubber ring connects the casing to the positive / negative terminal, allowing the casing to carry the corresponding terminal's potential and reducing the risk of corrosion. However, the resistance of the conductive rubber ring in the above-mentioned technical solution is prone to change, leading to unstable resistance between the casing and the positive / negative terminals, posing a safety hazard.

[0005] Application content

[0006] This application aims to at least partially address one of the technical problems in the related art.

[0007] Therefore, one objective of this application is to provide a battery cell in which the casing is electrically connected to the first terminal via an electrical connector. The electrical connector is not connected to the battery's working circuit, and the temperature of the electrical connector is not affected by the working current, thus ensuring the stability of the electrical connector's resistance. This allows the casing to be stably charged, thereby improving the safety of the battery cell.

[0008] This application also proposes a battery module comprising the aforementioned battery cells.

[0009] This application also proposes an electrical device that includes the aforementioned battery module.

[0010] A battery cell according to an embodiment of this application includes: a housing; a battery cell disposed within the housing; a first terminal and a second terminal, both of which are electrically connected to the battery cell, and the first terminal and the second terminal are respectively insulated from the housing; and an electrical connector disposed in the housing and electrically connected to the housing, and the electrical connector is electrically connected to the first terminal.

[0011] According to the battery cell of this application embodiment, when the battery cell is working, the first terminal and the second terminal are connected to the circuit, and current flows through the first terminal and the second terminal, causing the temperature of the first terminal and the second terminal to rise. However, since the first terminal and the second terminal are both insulated from the casing, the temperature rise of the first terminal and the second terminal does not affect the charging status of the casing. When the battery cell is working, the electrical connector is not connected to the battery working circuit, and the temperature of the electrical connector is not affected by the working current, ensuring the stability of the resistance of the electrical connector, that is, ensuring the stability of the resistance between the casing and the first terminal, so that the casing can be stably charged, thus improving the safety of the battery cell.

[0012] According to some embodiments of the present application, in a battery cell, the electrical connector and the housing are electrically connected by a conductive seal, wherein the resistance value of the conductive seal is greater than the resistance value of the electrical connector.

[0013] According to some embodiments of the present application, the conductive seal of the battery cell is constructed as a conductive rubber ring.

[0014] According to some embodiments of the present application, in a battery cell, the electrical connector is located on the side of the housing away from the first terminal post.

[0015] According to some embodiments of the present application, in a battery cell, the electrical connector and the second terminal are located on the same end face of the housing.

[0016] According to some embodiments of the present application, the distance between the electrical connector and the second terminal post in the battery cell is A, where A ≥ 2 cm.

[0017] According to some embodiments of the present application, in a battery cell, the cross-sectional area of ​​the electrical connector is smaller than the cross-sectional area of ​​the second electrode post.

[0018] According to some embodiments of the present application, the battery cell includes a first sidewall and a second sidewall, the first sidewall and the second sidewall are distributed at both ends in the length direction of the housing, the first electrode is located on the first sidewall, and the second electrode and the electrical connector are located on the second sidewall.

[0019] According to some embodiments of the present application, the battery cell has multiple electrical connectors distributed on different sidewalls of the housing, one of which is electrically connected to the first electrode post.

[0020] According to some embodiments of the present application, the battery cell includes a first sidewall and a second sidewall, which are distributed at both ends of the length direction of the housing. Two electrical connectors are provided, and the two electrical connectors are respectively provided on the first sidewall and the second sidewall. One of the two electrical connectors is electrically connected to the first terminal post.

[0021] The battery module according to the embodiments of this application includes: the battery cell described in the above technical solution.

[0022] According to some embodiments of the present application, the battery module further includes a battery management unit, which is connected to the electrical connector and the second terminal respectively to detect the voltage difference between the first terminal and the second terminal.

[0023] The electrical equipment according to the embodiments of this application includes: the battery module described in the above technical solution.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] Figure 1 is an exploded view of a battery cell according to an embodiment of this application;

[0026] Figure 2 is a schematic diagram of the fit between the electrical connector and the housing;

[0027] Figure 3 is a schematic diagram of the fit between the first connecting part and the first pole post;

[0028] Figure 4 is a schematic diagram of the cooperation between the second connecting part and the electrical connector;

[0029] Figure 5 is a schematic diagram of a battery module according to an embodiment of this application;

[0030] Figure 6 is a schematic diagram of an electrical device according to an embodiment of this application.

[0031] Reference numerals: 100, battery cell; 200, battery module; 300, electrical device; 1, housing; 11, main body; 12, first side wall; 13, second side wall; 131, third through hole; 2, battery cell; 3, first terminal; 4, second terminal; 5, electrical connector; 50, conductive seal; 51, conductive rubber ring; 6, extension; 61, first connection part; 62, extension part; 63, second connection part; 7, guide; 71, guide groove; 8, battery management unit; 9, positive and negative electrode connection piece. Detailed Implementation

[0032] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0033] The battery cell 100 according to an embodiment of this application is described below with reference to Figures 1-6.

[0034] Referring to Figures 1, 2 and 3, the battery cell 100 according to an embodiment of this application includes: a housing 1, a battery cell 2, a first terminal 3 and a second terminal 4, wherein the battery cell 2 is disposed inside the housing 1, the first terminal 3 and the second terminal 4 are both electrically connected to the battery cell 2, and the first terminal 3 and the second terminal 4 are respectively insulated from the housing 1.

[0035] The battery cell 100 also includes an electrical connector 5, which is disposed on the housing 1 and electrically connected to the housing 1. The electrical connector 5 is electrically connected to the first terminal 3, that is, the housing 1 is electrically connected to the first terminal 3 through the electrical connector 5, so that the housing 1 and the first terminal 3 have the same potential, thereby reducing the risk of corrosion of the housing 1.

[0036] It should be noted that the first terminal 3 can be either a positive terminal or a negative terminal. For example, in some embodiments, the housing 1 is an aluminum structural component, the first terminal 3 is a positive terminal, and the second terminal 4 is a negative terminal. In this case, the housing 1 is electrically connected to the positive terminal through the electrical connector 5, and the housing 1 and the positive terminal have the same potential, reducing the risk of corrosion of the aluminum housing 1. In other embodiments, the housing 1 is a steel structural component, the first terminal 3 is a negative terminal, and the second terminal 4 is a positive terminal. In this case, the housing 1 is electrically connected to the negative terminal through the electrical connector 5, and the housing 1 and the negative terminal have the same potential, reducing the risk of corrosion of the steel housing 1.

[0037] According to the battery cell 100 of this application embodiment, when the battery cell 100 is working, the first terminal 3 and the second terminal 4 are connected to the circuit, and current flows through the first terminal 3 and the second terminal 4. The temperature of the first terminal 3 and the second terminal 4 rises, but because the first terminal 3 and the second terminal 4 are both insulated from the housing 1, the temperature rise of the first terminal 3 and the second terminal 4 does not affect the charging status of the housing 1. When the battery cell 100 is working, the electrical connector 5 is not connected to the battery working circuit, and the temperature of the electrical connector 5 is not affected by the working current, ensuring the stability of the resistance of the electrical connector 5, that is, ensuring the stability of the resistance between the housing 1 and the first terminal 3, so that the housing 1 can be stably charged, improving the safety of the battery cell 100.

[0038] Referring to Figures 1 and 2, in some embodiments, the electrical connector 5 passes through the housing 1 such that at least a portion of the electrical connector 5 is located outside the housing 1, so as to facilitate the connection of the electrical connector 5 to an external structure.

[0039] In some further embodiments, the electrical connector 5 and the second sidewall 13 are electrically connected by a conductive seal 50, which is fitted over the electrical connector 5 and seals the gap between the electrical connector 5 and the housing 1.

[0040] In this embodiment, the electrical connector 5 is electrically connected to the housing 1 via a conductive seal 50. The conductive seal 50 not only seals the housing 1 but also conducts electricity, simplifying the structure of the battery cell 100 and reducing its cost. Furthermore, the conductive seal 50 increases the resistance between the first terminal 3 and the housing 1, further reducing the current between them and thus minimizing the impact of the current on the resistance.

[0041] In some further embodiments, the resistance value of the conductive seal 50 is greater than the resistance value of the electrical connector 5.

[0042] The above technical solution further increases the resistance between the first electrode 3 and the housing 1, making the current that can pass between the first electrode 3 and the housing 1 very small, which will hardly affect the temperature of the conductive seal 50 and the electrical connector 5, thus ensuring the stability of the resistance value between the first electrode 3 and the housing 1 and improving the safety of the battery cell 100.

[0043] Referring to Figures 1 and 2, in some specific embodiments, the conductive seal 50 is constructed as a conductive rubber ring 51. The substrate of the conductive rubber ring 51 can be made of materials such as fluororubber, EPDM, silicone rubber, or fluorosilicone rubber. Furthermore, conductive materials such as carbon black, graphite, and metal nanoparticles can be added to the conductive rubber ring 51, making the usable resistance value of the conductive rubber ring 51 range from 500Ω to 100kΩ.

[0044] In this embodiment, a certain resistance is provided between the housing 1 and the first electrode 3 by means of the conductive sealing element 50, so as to avoid the safety hazards caused to the battery and module by the huge short circuit current generated by the housing 1 conducting the positive and negative electrodes under faults such as short circuit and puncture, and improve the safety of the battery cell 100.

[0045] In this embodiment, the conductive rubber ring 51 is disposed on the electrical connector 5, which avoids the current and high heat of the first electrode 3 from affecting the conductive rubber ring 51, enhances the mechanical stability, resistance stability and voltage stability of the conductive rubber ring 51 and extends the service life of the battery cell 100.

[0046] In some embodiments, the electrical connector 5 is located on the side of the housing 1 away from the first pole 3.

[0047] In the above technical solution, by increasing the distance between the electrical connector 5 and the first terminal 3, the temperature generated by the first terminal 3 is effectively prevented from affecting the electrical connector 5, ensuring the stability of the resistance of the electrical connector 5 and improving the safety of the battery cell 100.

[0048] Because the electrical connector 5 is electrically connected to the first terminal 3, the voltage between the electrical connector 5 and the second terminal 4 is detected, that is, the voltage between the first terminal 3 and the second terminal 4 is detected. Referring to Figures 1, 2, and 5, when the battery cell 100 in this embodiment is applied in the battery module 200, the battery management unit 8 of the battery module 200 can detect the voltage between the first terminal 3 and the second terminal 4 by detecting the voltage between the electrical connector 5 and the second terminal 4.

[0049] Referring to Figures 1, 2 and 3, in some embodiments, the electrical connector 5 and the second pole 4 are located on the same end face of the housing 1.

[0050] In this embodiment, the electrical connector 5 and the second terminal 4 are disposed on the same end face of the housing 1 so as to connect the electrical connector 5 and the second terminal 4 to the battery management unit 8, so that the battery management unit 8 can detect the voltage between the first terminal 3 and the second terminal 4, which simplifies the structure of the battery module 200 and reduces the cost of the battery module 200.

[0051] In some further embodiments, the distance between the electrical connector 5 and the second pole post 4 is A, where A ≥ 2 cm.

[0052] The above technical solution avoids the temperature generated by the second electrode post 4 from affecting the electrical connector 5, ensures the stability of the resistance of the electrical connector 5, and improves the safety of the battery cell 100.

[0053] In some specific embodiments, the distance A between the electrical connector 5 and the second pole 4 can be 2cm, 2.5cm, 3cm or other dimensions.

[0054] Referring to Figures 1, 2 and 5, in some embodiments, the housing 1 includes a first sidewall 12 and a second sidewall 13, which are distributed at both ends of the housing 1 along its length. The first pole post 3 is located on the first sidewall 12, and the second pole post 4 and the electrical connector 5 are located on the second sidewall 13.

[0055] In related technologies, due to the characteristics of its own structure, the positive and negative terminals of the battery cell 100 are distributed on both sides of the casing 1. In order to collect the voltage information of the battery cell 100, the battery module usually needs to set up two circuit boards, which are distributed on both sides of the battery cell 100 and electrically connected to the positive and negative terminals respectively.

[0056] In this embodiment, the second terminal 4 and the electrical connector 5 are both located on the second side wall 13. To collect the voltage information of the battery cell 100 in this embodiment, the battery module only needs to set up a circuit board. The circuit board is set on the second side wall 13 of the housing 1, so that the circuit board is electrically connected to the second terminal 4 and the electrical connector 5 respectively, and the voltage between the positive terminal and the negative terminal can be detected.

[0057] The embodiments of this application can realize the same-side voltage measurement of battery cells 100, which helps to simplify the structure of battery module 200 and reduce the cost of battery module 200.

[0058] Referring to Figures 1, 2 and 3, in some specific embodiments, the housing 1 includes: a main body 11 and two cover plates. The main body 11 is generally rectangular, and both ends of the main body 11 are provided with openings. The two cover plates are respectively provided at both ends of the main body 11, and the cover plates close the openings at the corresponding ends of the main body 11. The main body 11 and the two cover plates define an accommodating space for placing the battery cell 2. The two cover plates are respectively formed as the first sidewall 12 and the second sidewall 13 described above.

[0059] The housing 1 in this embodiment has a simple structure, which reduces the cost of the battery cell 100.

[0060] In some specific embodiments, the first sidewall 12 is provided with a first through hole, through which the first pole post 3 passes, such that at least a portion of the first pole post 3 is located outside the housing 1, facilitating connection between the first pole post 3 and an external structure; the second sidewall 13 is provided with a second through hole, through which the second pole post 4 passes, such that at least a portion of the second pole post 4 is located outside the housing 1, facilitating connection between the second pole post 4 and an external structure. To ensure the sealing of the housing 1, the first pole post 3 is fitted with a first sealing element that seals the first through hole, and the second pole post 4 is fitted with a second sealing element that seals the second through hole. Both the first and second sealing elements are made of insulating material, so that the first pole post 3 and the second pole post 4 are respectively insulated from the housing 1.

[0061] Referring to Figures 1, 2, and 3, the second sidewall 13 is further provided with a third through hole 131. The electrical connector 5 passes through the third through hole 131, such that at least a portion of the electrical connector 5 is located outside the housing 1, facilitating connection of the electrical connector 5 to an external structure. The electrical connector 5 and the second sidewall 13 are electrically connected by a conductive rubber ring 51, which is fitted over the electrical connector 5 and seals the third through hole 131.

[0062] In this embodiment, the electrical connector 5 is electrically connected to the housing 1 via a conductive rubber ring 51. The conductive rubber ring 51 not only seals the housing 1 but also conducts electricity, simplifying the structure of the battery cell 100 and reducing its cost.

[0063] In some embodiments, the structure of the electrical connector 5 is the same as that of the first pole 3 and the second pole 4, and the assembly method of the electrical connector 5 and the housing 1 is also the same as that of the first pole 3, the second pole 4 and the housing 1.

[0064] The above technical solutions improve the overall assembly efficiency of the battery cell 100.

[0065] In some embodiments, the cross-sectional area of ​​the electrical connector 5 is smaller than the cross-sectional area of ​​the second pole 4, so as to facilitate the identification of the electrical connector 5 and the second pole 4.

[0066] In some further embodiments, the electrical connector 5 is constructed such that the second pole post 4 is scaled down by 0.3-0.5 times.

[0067] Since the electrical connector 5 is only used for voltage detection and does not need to carry current, the cost of the battery cell 100 is reduced by decreasing the size of the electrical connector 5 in this embodiment of the application.

[0068] In some embodiments, there are multiple electrical connectors 5, which are distributed on different sidewalls of the housing 1, and one of the electrical connectors 5 is electrically connected to the first pole post 3.

[0069] Through the above technical solution, during the assembly process of the battery cell 100, the first terminal 3 can be selectively connected to an electrical connector 5, thereby improving the assembly efficiency of the battery cell 100.

[0070] In some embodiments, the housing 1 includes a first sidewall 12 and a second sidewall 13, which are distributed at both ends along the length of the housing 1. A positive electrode post is disposed on the first sidewall 12, and a negative electrode post is disposed on the second sidewall 13. Two electrical connectors 5 are provided, which are respectively disposed on the first sidewall 12 and the second sidewall 13.

[0071] One of the two electrical connectors 5 is electrically connected to the first pole. It should be noted that in different embodiments, the positive pole located on the first side wall 12 can be the first pole, and the negative pole located on the second side wall 13 can also be the first pole. The specific situation needs to be determined according to the material of the housing 1.

[0072] In some specific embodiments, the housing 1 is an aluminum structural component. In this embodiment, the positive terminal located on the first sidewall 12 is a first terminal, and the electrical connector 5 located on the second sidewall 13 is electrically connected to the positive terminal located on the first sidewall 12. The housing 1 and the positive terminal have the same potential, reducing the risk of corrosion of the aluminum housing 1. In this embodiment, the electrical connector 5 located on the first sidewall 12 can be left idle.

[0073] In other specific embodiments, the housing 1 is a steel structural component. In this embodiment, the negative terminal located on the second side wall 13 is the first terminal, and the electrical connector 5 located on the first side wall 12 is electrically connected to the negative terminal located on the second side wall 13. The housing 1 and the negative terminal have the same potential, reducing the risk of corrosion of the steel housing 1. In this embodiment, the electrical connector 5 located on the second side wall 13 can be left idle.

[0074] Referring to Figures 1, 3 and 4, in some embodiments, the electrical connector 5 is electrically connected to the first pole 3 via an extension 6 extending within the housing 1.

[0075] In the above technical solution, the electrical connector 5 does not need to directly contact the first terminal 3, which simplifies the structure of the electrical connector 5 and reduces the cost of the battery cell 100. Furthermore, the electrical connector 5 is indirectly connected to the first terminal 3 through the extension 6, which further reduces the impact of temperature changes of the first terminal 3 on the electrical connector 5 and further improves the safety of the battery cell 100.

[0076] In some embodiments, the extension 6 includes a first connecting portion 61, an extension portion 62, and a second connecting portion 63. The extension portion 62 is located on one side of the battery cell 2, the first connecting portion 61 and the second connecting portion 63 are located at both ends of the battery cell 2, the first connecting portion 61 is connected to the first terminal post 3, the second connecting portion 63 is connected to the electrical connector 5, and both the first connecting portion 61 and the second connecting portion 63 are connected to the extension portion 62.

[0077] It should be noted that the connection between the first connecting part 61 and the first pole post 3 can be either welding or plugging, as long as the first connecting part 61 and the first pole post 3 can be electrically connected; the connection between the second connecting part 63 and the electrical connector 5 can be either welding or plugging, as long as the second connecting part 63 and the electrical connector 5 can be electrically connected.

[0078] In this embodiment, the extension 6 has a simple structure, which reduces the cost of the battery cell 100.

[0079] In some specific embodiments, the first connecting part 61 is formed into a long strip structure. The first connecting part 61 is located between the tab of the battery cell 2 and the cover plate lead-out piece of the first pole post 3. The tab of the battery cell 2, the first connecting part 61 and the cover plate lead-out piece of the first pole post 3 are fixedly connected by laser welding to achieve conduction.

[0080] In this embodiment, the first connecting part 61 is connected to the first pole post 3 by welding, which improves the reliability of the electrical connection between the first connecting part 61 and the first pole post 3.

[0081] In some specific embodiments, the second connecting part 63 is formed in a circular shape, and the diameter of the second connecting part 63 is smaller than the diameter of the lead-out piece of the electrical connector 5. The second connecting part 63 is fixed to the lead-out piece of the electrical connector 5 by laser welding to achieve conductivity.

[0082] In this embodiment, the second connecting part 63 is connected to the electrical connector 5 by welding, which improves the reliability of the electrical connection between the second connecting part 63 and the electrical connector 5.

[0083] Referring to FIG1, in some embodiments, the battery cell 100 further includes a guide 7, which is disposed on one side of the cell 2, and the guide 7 is provided with a guide groove 71, and the extension portion 62 of the extension 6 is located in the guide groove 71.

[0084] In the above technical solution, by placing a portion of the extension 6 inside the guide groove 71 and protecting the extension 62 with the guide 7, the risk of the extension 62 interfering with other structures is reduced, the risk of the extension 62 deforming is reduced, the risk of the extension 62 breaking is reduced, and the reliability of the battery cell 100 is improved.

[0085] In some embodiments, the extension 6 is constructed as a conductive foil.

[0086] The extension 6 in this embodiment has a simple structure, which reduces the cost of the battery cell 100, and the conductive foil is lightweight, which is beneficial to the weight reduction of the battery cell 100.

[0087] In some specific embodiments, the extension 6 is constructed as a conductive foil, at least a portion of which is connected to the housing 1 via an insulating adhesive. The insulating adhesive may be insulating blue glue.

[0088] The above technical solution reduces the risk of deformation of the conductive aluminum foil during the assembly of the battery cell 100 and improves the assembly efficiency of the battery cell 100.

[0089] A specific embodiment of this application is described below with reference to Figures 1-5.

[0090] According to an embodiment of this application, a battery cell 100 includes: a housing 1, a battery cell 2, a first terminal 3 and a second terminal 4, wherein the battery cell 2 is disposed inside the housing 1, the first terminal 3 and the second terminal 4 are both electrically connected to the battery cell 2, and the first terminal 3 and the second terminal 4 are respectively insulated from the housing 1.

[0091] The battery cell 100 also includes an electrical connector 5, which is disposed on the housing 1 and electrically connected to the housing 1, and is electrically connected to the first terminal 3.

[0092] The housing 1 is an aluminum structural component. The first terminal 3 is the positive terminal and the second terminal 4 is the negative terminal. At this time, the housing 1 is electrically connected to the positive terminal through the electrical connector 5, and the potentials of the housing 1 and the positive terminal are the same.

[0093] Electrical connector 5 passes through housing 1 and is located adjacent to second pole post 4.

[0094] The housing 1 includes a first sidewall 12 and a second sidewall 13, which are distributed at both ends of the housing 1 along its length. The first pole post 3 is located on the first sidewall 12, and the second pole post 4 and the electrical connector 5 are located on the second sidewall 13.

[0095] The housing 1 includes a main body 11 and two cover plates. The main body 11 is generally rectangular and has openings at both ends. The two cover plates are respectively disposed at both ends of the main body 11. The cover plates close the openings at the corresponding ends of the main body 11. The main body 11 and the two cover plates define an accommodating space for placing the battery cell 2. The two cover plates are respectively formed as the first side wall 12 and the second side wall 13 mentioned above.

[0096] The first sidewall 12 is provided with a first through hole, through which the first pole post 3 passes, such that at least a portion of the first pole post 3 is located outside the housing 1, facilitating connection between the first pole post 3 and an external structure. The housing 1 is also provided with a second through hole, through which the second pole post 4 passes, such that at least a portion of the second pole post 4 is located outside the housing 1, facilitating connection between the second pole post 4 and an external structure. To ensure the sealing of the housing 1, the first pole post 3 is fitted with a first sealing element that seals the first through hole, and the second pole post 4 is fitted with a second sealing element that seals the second through hole. Both the first and second sealing elements are made of insulating material, ensuring that the first pole post 3 and the second pole post 4 are insulated from the housing 1.

[0097] The second sidewall 13 is also provided with a third through hole 131, through which the electrical connector 5 passes, such that at least a portion of the electrical connector 5 is located outside the housing 1, facilitating connection of the electrical connector 5 to an external structure. The electrical connector 5 and the second sidewall 13 are electrically connected by a conductive seal 50, which is fitted over the electrical connector 5 and seals the third through hole 131. The conductive seal 50 is constructed as a conductive rubber ring 51.

[0098] The size of the electrical connector 5 is proportionally reduced to 0.3 times that of the first pole post 3.

[0099] Electrical connector 5 is electrically connected to first pole post 3 via extension 6 extending inside housing 1.

[0100] The extension 6 includes a first connecting part 61, an extension part 62, and a second connecting part 63. The extension part 62 is located on one side of the battery cell 2, and the first connecting part 61 and the second connecting part 63 are located at both ends of the battery cell 2. The first connecting part 61 is connected to the first terminal post 3, and the second connecting part 63 is connected to the electrical connector 5. Both the first connecting part 61 and the second connecting part 63 are connected to the extension part 62.

[0101] The first connecting part 61 is formed into a long strip structure. The first connecting part 61 is located between the tab of the battery cell 2 and the cover plate lead-out piece of the first pole post 3. The tab of the battery cell 2, the first connecting part 61 and the cover plate lead-out piece of the first pole post 3 are fixedly connected by laser welding to achieve conduction.

[0102] The second connecting part 63 is circular, and the diameter of the second connecting part 63 is smaller than the diameter of the lead-out piece of the electrical connector 5. The second connecting part 63 is fixed to the lead-out piece of the electrical connector 5 by laser welding to achieve conductivity.

[0103] The battery cell 100 also includes a guide 7, which is located on one side of the cell 2. The guide 7 has a guide groove 71, and the extension 62 of the extension 6 is located in the guide groove 71.

[0104] The extension 6 is constructed of conductive aluminum foil, and the extension portion 62 of the extension 6 is connected to the housing 1 by insulating blue glue.

[0105] Referring to Figures 1, 2 and 5, the battery module 200 according to an embodiment of this application includes: the battery cell 100 in the above technical solution.

[0106] According to the battery module 200 of this application embodiment, when the battery cell 100 is working, the first terminal 3 and the second terminal 4 are connected to the circuit, and current flows through the first terminal 3 and the second terminal 4. The temperature of the first terminal 3 and the second terminal 4 rises, but because the first terminal 3 and the second terminal 4 are both insulated from the housing 1, the temperature rise of the first terminal 3 and the second terminal 4 does not affect the charging status of the housing 1. When the battery cell 100 is working, the electrical connector 5 is not connected to the battery working circuit, and the temperature of the electrical connector 5 is not affected by the working current, ensuring the stability of the resistance of the electrical connector 5, that is, ensuring the stability of the resistance between the housing 1 and the first terminal 3, so that the housing 1 can be stably charged, improving the safety of the battery cell 100, thereby improving the safety of the battery module 200.

[0107] In some embodiments, the battery module 200 further includes a battery management unit 8, which is connected to the electrical connector 5 and the second terminal 4 respectively, to detect the voltage difference between the first terminal 3 and the second terminal 4.

[0108] Through the above technical solution, the battery management unit 8 can detect the voltage between the first terminal 3 and the second terminal 4 by detecting the voltage between the electrical connector 5 and the second terminal 4. The battery management unit 8 does not need to be connected to the first terminal 3, which is located relatively far away, thus simplifying the structure of the battery module 200 and reducing the cost of the battery module 200.

[0109] In some specific embodiments, the housing 1 includes a first sidewall 12 and a second sidewall 13, which are distributed at both ends along the length of the housing 1. A first electrode post 3 is located on the first sidewall 12, and a second electrode post 4 and an electrical connector 5 are located on the second sidewall 13. The first electrode post 3 is the positive electrode post, and the second electrode post 4 is the negative electrode post.

[0110] The battery module 200 includes multiple battery cells 100 and multiple positive and negative electrode connecting pieces 9. The multiple battery cells 100 are arranged along the width or thickness direction of the battery cells 100. The negative electrode of each battery cell 100 is electrically connected to the positive electrode of an adjacent battery cell 100 through the positive and negative electrode connecting piece 9.

[0111] Only one battery management unit 8 is provided. This unit only needs to be located on one side of multiple battery cells 100 to sample and analyze their voltages. The specific sampling method is as follows: The voltage of the leftmost battery cell 100 (the first battery cell 100) in the battery module 200 can be calculated by collecting the negative potential of the positive and negative electrode connection piece 9 at the negative terminal of the battery cell 100 and the positive potential of the electrical connector 5. The negative potential of the second battery cell 100 is equal to the positive potential of the first battery cell 100, and also equal to the potential of the electrical connector 5 on the first battery cell 100. Simultaneously, the positive potential of the second battery cell 100 is equal to the negative potential of its adjacent third battery cell 100. Therefore, the voltage of the second battery cell 100 can be calculated by converting the potential of the electrical connector 5 of the first battery cell 100 and the negative potential of the third battery cell 100. The voltage acquisition of other battery cells 100 in battery module 200 is carried out in the same way, and finally the same-side voltage measurement of battery module 200 is realized.

[0112] As shown in Figure 6, the electrical device 300 according to the embodiment of this application includes the battery module 200 in the above technical solution. The electrical device 300 can be a vehicle, a power bank, or other devices, and this application does not limit it to such devices.

[0113] According to the embodiment of this application, when the electrical device 300 is working, the battery module 200 provides power, the first terminal 3 and the second terminal 4 are connected to the circuit, and current flows through the first terminal 3 and the second terminal 4, causing the temperature of the first terminal 3 and the second terminal 4 to rise. However, since the first terminal 3 and the second terminal 4 are both insulated from the housing 1, the temperature rise of the first terminal 3 and the second terminal 4 does not affect the charging status of the housing 1. When the battery cell 100 is working, the electrical connector 5 is not connected to the battery working circuit, and the temperature of the electrical connector 5 is not affected by the current, ensuring the stability of the resistance of the electrical connector 5, that is, ensuring the stability of the resistance between the housing 1 and the first terminal 3, so that the housing 1 can be stably charged, improving the safety of the battery cell 100, improving the safety of the battery module 200, and thus improving the safety of the electrical device 300.

[0114] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0115] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0116] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0117] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0118] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0119] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell (100), wherein, include: Shell (1); Battery cell (2), wherein the battery cell (2) is disposed within the housing (1); The first pole (3) and the second pole (4) are electrically connected to the battery cell (2), and the first pole (3) and the second pole (4) are respectively insulated from the housing (1). Electrical connector (5) is disposed on the housing (1) and electrically connected to the housing (1), and the electrical connector (5) is electrically connected to the first pole (3).

2. The battery cell (100) according to claim 1, wherein, The electrical connector (5) and the housing (1) are electrically connected by a conductive seal (50), the resistance of which is greater than that of the electrical connector (5).

3. The battery cell (100) according to claim 2, wherein, The conductive seal (50) is constructed as a conductive rubber ring (51).

4. The battery cell (100) according to any one of claims 1-3, wherein, The electrical connector (5) is located on the side of the housing (1) away from the first pole (3).

5. The battery cell (100) according to claim 4, wherein, The electrical connector (5) and the second pole (4) are located on the same end face of the housing (1).

6. The battery cell (100) according to claim 5, wherein, The distance between the electrical connector (5) and the second pole (4) is A, where A ≥ 2 cm.

7. The battery cell (100) according to any one of claims 5-6, wherein, The cross-sectional area of ​​the electrical connector (5) is smaller than that of the second pole (4).

8. The battery cell (100) according to any one of claims 5-7, wherein, The housing (1) includes a first sidewall (12) and a second sidewall (13), the first sidewall (12) and the second sidewall (13) are distributed at both ends of the length direction of the housing (1), the first pole post (3) is located on the first sidewall (12), and the second pole post (4) and the electrical connector (5) are located on the second sidewall (13).

9. The battery cell (100) according to any one of claims 1-8, wherein, The electrical connectors (5) are multiple and distributed on different sidewalls of the housing (1), and one of the electrical connectors (5) is electrically connected to the first pole (3).

10. The battery cell (100) according to claim 9, wherein, The housing (1) includes a first sidewall (12) and a second sidewall (13), the first sidewall (12) and the second sidewall (13) are distributed at both ends of the length direction of the housing (1), and two electrical connectors (5) are provided, and the two electrical connectors (5) are respectively provided on the first sidewall (12) and the second sidewall (13), and one of the two electrical connectors (5) is electrically connected to the first pole (3).

11. A battery module (200), wherein, include: The battery cell (100) according to any one of claims 1-10.

12. The battery module (200) according to claim 11, wherein, It also includes a battery management unit (8), which is connected to the electrical connector (5) and the second terminal (4) respectively, to detect the voltage difference between the first terminal (3) and the second terminal (4).

13. An electrical appliance (300), wherein, include: The battery module (200) according to claim 11 or 12.

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