Battery monomer, battery module and electric equipment

Abstract

The utility model discloses a battery monomer, a battery module and electric equipment. The battery monomer comprises a shell, a battery module and a battery module, a battery cell, wherein the battery cell is arranged in the shell; the first terminal post and the second terminal post are both electrically connected with the battery cell, and the first terminal post and the second terminal post are respectively matched with the shell in an insulating manner; and the electric connecting piece is arranged on the shell and is electrically connected with the shell, and the electric connecting piece is electrically connected with the first polar column. According to the single battery provided by the utility model, the shell is electrically connected with the first pole column through the electric connecting piece, the electric connecting piece is not connected into a battery working loop, the temperature of the electric connecting piece is not influenced by working current, the stability of resistance of the electric connecting piece is ensured, the shell can be electrified stably, and the safety of the single battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a battery cell, a battery module and an electrical device. Background Art

[0002] In the related art, a battery cell includes a housing and an electric core disposed inside the housing. The electric core is respectively connected with a positive electrode terminal and a negative electrode terminal. In order to prevent the housing from being corroded by the electrolyte, a conductive rubber ring is usually sleeved on the positive electrode terminal or the negative electrode terminal, and the housing is connected to the positive / negative electrode terminal through the conductive rubber ring, so that the housing has the potential of the corresponding terminal, reducing the risk of the housing being corroded. However, the resistance value of the conductive rubber ring in the above technical solution is likely to change, resulting in an unstable resistance value between the housing and the positive / negative electrode terminal, posing a safety hazard. Content of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery cell, in which the housing is electrically connected to a first terminal through an electrical connector. The electrical connector is not connected to the battery working circuit, and the temperature of the electrical connector will not be affected by the working current, ensuring the stability of the resistance of the electrical connector, enabling the housing to be charged stably, and improving the safety of the battery cell.

[0004] The utility model also provides a battery module including the above battery cell.

[0005] The utility model also provides an electrical device including the above battery module.

[0006] According to an embodiment of the utility model, the battery cell includes: a housing; an electric core disposed inside the housing; a first terminal and a second terminal, both the first terminal and the second terminal are electrically connected to the electric core, and the first terminal and the second terminal are respectively in insulating fit with the housing; an electrical connector disposed on the housing and electrically connected to the housing, and the electrical connector is electrically connected to the first terminal.

[0007] When the battery cell works according to an embodiment of the utility model, the first terminal and the second terminal are connected to the circuit, current passes through the first terminal and the second terminal, and the temperatures of the first terminal and the second terminal rise. However, since the first terminal and the second terminal are respectively in insulating fit with the housing, the temperature rise of the first terminal and the second terminal does not affect the charging condition of the housing; when the battery cell works, the electrical connector is not connected to the battery working circuit, and the temperature of the electrical connector will not be 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 housing and the first terminal, enabling the housing to be charged stably, and improving the safety of the battery cell.

[0008] In some embodiments, the electrical connector and the housing are electrically connected through a conductive seal, and the resistance value of the conductive seal is greater than that of the electrical connector.

[0009] In some embodiments, the conductive seal is configured as a conductive rubber ring.

[0010] In some embodiments, the electrical connector is located on a side of the housing away from the first pole.

[0011] In some embodiments, the electrical connector and the second pole are located on the same end face of the housing.

[0012] In some embodiments, the distance between the electrical connector and the second pole is A, and A ≥ 2 cm.

[0013] In some embodiments, the cross-sectional area of the electrical connector is smaller than that of the second pole.

[0014] In some embodiments, the housing includes a first side wall and a second side wall, the first side wall and the second side wall are distributed at two ends of the length direction of the housing, the first pole is located on the first side wall, and the second pole and the electrical connector are located on the second side wall.

[0015] In some embodiments, there are multiple electrical connectors distributed on different side walls of the housing, and one of the electrical connectors is electrically connected to the first pole.

[0016] In some embodiments, the housing includes a first side wall and a second side wall, the first side wall and the second side wall are distributed at two ends of the length direction of the housing, there are two electrical connectors, and the two electrical connectors are respectively arranged on the first side wall and the second side wall, and one of the two electrical connectors is electrically connected to the first pole.

[0017] The battery module according to an embodiment of the present invention includes: the battery cell described in the above technical solution.

[0018] In some embodiments, the battery module further includes a battery management unit, and the battery management unit is respectively connected to the electrical connector and the second pole to detect the voltage difference between the first pole and the second pole.

[0019] The electrical device according to an embodiment of the present invention includes: the battery module described in the above technical solution.

[0020] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. Brief Description of the Drawings

[0021] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0022] Figure 1 is an exploded view of a battery cell according to an embodiment of the present utility model;

[0023] Figure 2 is a schematic diagram of the cooperation between an electrical connector and a housing;

[0024] Figure 3 is a schematic diagram of the cooperation between a first connecting portion and a first pole;

[0025] Figure 4 is a schematic diagram of the cooperation between a second connecting portion and an electrical connector;

[0026] Figure 5 is a schematic diagram of a battery module according to an embodiment of the present utility model.

[0027] Reference numerals: 100, battery cell; 200, battery module; 1, housing; 11, main body; 12, first side wall; 13, second side wall; 131, third through hole; 2, battery core; 3, first pole; 4, second pole; 5, electrical connector; 51, conductive rubber ring; 6, extension member; 61, first connecting portion; 62, extension portion; 63, second connecting portion; 7, guiding member; 71, guiding groove; 8, battery management unit; 9, positive and negative connection piece. Detailed Description of the Embodiments

[0028] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where 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 by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] Next, reference is made to Figures 1 - 5 describe the battery cell 100 according to an embodiment of the present utility model.

[0032] Referring to Figure 1 、 Figure 2 and Figure 3 , the battery cell 100 according to an embodiment of the present utility model includes: a housing 1, an electrode assembly 2, a first terminal 3 and a second terminal 4. The electrode assembly 2 is disposed inside the housing 1. The first terminal 3 and the second terminal 4 are both electrically connected to the electrode assembly 2, and the first terminal 3 and the second terminal 4 are respectively insulated and cooperated with the housing 1.

[0033] The battery cell 100 further includes an electrical connector 5. The electrical connector 5 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 electric potential, thereby reducing the risk of corrosion of the housing 1.

[0034] It should be noted that the first terminal 3 can be a positive terminal or a negative terminal. For example, in some embodiments, the housing 1 is an aluminum structural member, the first terminal 3 is a positive terminal, and the second terminal 4 is a negative terminal. At this time, the housing 1 is electrically connected to the positive terminal through the electrical connection member 5, and the housing 1 and the positive terminal have the same electric potential, reducing the risk of corrosion of the aluminum housing 1; in other embodiments, the housing 1 is a steel structural member, the first terminal 3 is a negative terminal, and the second terminal 4 is a positive terminal. At this time, the housing 1 is electrically connected to the negative terminal through the electrical connection member 5, and the housing 1 and the negative terminal have the same electric potential, reducing the risk of corrosion of the steel housing 1.

[0035] For the battery cell 100 according to the embodiment of the present invention, when the battery cell 100 works, the first terminal 3 and the second terminal 4 are connected to the circuit, current passes through the first terminal 3 and the second terminal 4, and the temperatures of the first terminal 3 and the second terminal 4 rise. However, because the first terminal 3 and the second terminal 4 are both in insulating fit with the housing 1, the temperature rise of the first terminal 3 and the second terminal 4 does not affect the electrified state of the housing 1; when the battery cell 100 works, the electrical connection member 5 is not connected to the battery working circuit, and the temperature of the electrical connection member 5 is not affected by the working current, ensuring the stability of the resistance of the electrical connection member 5, that is, ensuring the stability of the resistance between the housing 1 and the first terminal 3, enabling the housing 1 to be stably electrified and improving the safety of the battery cell 100.

[0036] Referring to Figure 1 and Figure 2 , in some embodiments, the electrical connection member 5 penetrates through the housing 1 such that at least a part of the electrical connection member 5 is located outside the housing 1 to facilitate connecting the electrical connection member 5 to an external structure.

[0037] In some further embodiments, the electrical connection member 5 and the second side wall 13 are electrically connected through a conductive seal. The conductive seal is sleeved on the electrical connection member 5 and seals the gap between the electrical connection member 5 and the housing 1.

[0038] In the embodiment of the present invention, the electrical connection member 5 is electrically connected to the housing 1 through a conductive seal. The conductive seal not only seals the housing 1 but also conducts electricity, simplifying the structure of the battery cell 100 and reducing the cost of the battery cell 100. In addition, the conductive seal also increases the resistance between the first terminal 3 and the housing 1, further reducing the current between the first terminal 3 and the housing 1 and further reducing the influence of the current on the resistance between the first terminal 3 and the housing 1.

[0039] In some further embodiments, the resistance value of the conductive seal is greater than the resistance value of the electrical connection member 5.

[0040] Through the above technical solution, the resistance between the first terminal 3 and the housing 1 is further increased, so that the current that can pass between the first terminal 3 and the housing 1 is very small, hardly affecting the temperature of the conductive seal and the electrical connector 5, ensuring the stability of the resistance value between the first terminal 3 and the housing 1, and improving the safety of the battery cell 100.

[0041] Referring to Figure 1 and Figure 2 , in some specific embodiments, the conductive seal is configured as a conductive rubber ring 51, and the base material of the conductive rubber ring 51 can be made of materials such as fluororubber, ethylene propylene diene monomer, silicone rubber, fluorosilicone rubber, etc. And conductive materials such as carbon black, graphite, and metal nanoparticles can also be added into the conductive rubber ring 51, so that the available resistance value range of the conductive rubber ring 51 is from 500Ω to 100kΩ.

[0042] In the embodiment of the present utility model, a certain resistance is set between the housing 1 and the first terminal 3 through the conductive seal, avoiding the potential safety hazard caused by a huge short-circuit current generated when the housing 1 conducts the positive and negative terminals in the case of faults such as short circuit and needle puncture to the battery and the module, and improving the safety of the battery cell 100.

[0043] In the embodiment of the present utility model, the conductive rubber ring 51 is arranged on the electrical connector 5, avoiding the influence of the current and high heat of the first terminal 3 on the conductive rubber ring 51, enhancing the mechanical property stability of the conductive rubber ring 51, the resistance stability, and the voltage stability of the housing 1, and prolonging the service life of the battery cell 100.

[0044] In some embodiments, the electrical connector 5 is located on the side of the housing 1 away from the first terminal 3.

[0045] In the above technical solution, by increasing the distance between the electrical connector 5 and the first terminal 3, the influence of the temperature generated by the first terminal 3 on the electrical connector 5 is effectively avoided, ensuring the stability of the resistance of the electrical connector 5 and improving the safety of the battery cell 100.

[0046] Because the electrical connector 5 is electrically connected to the first terminal 3, detecting the voltage between the electrical connector 5 and the second terminal 4 is to detect the voltage between the first terminal 3 and the second terminal 4. Referring to Figure 1 , Figure 2 and Figure 5 , when the battery cell 100 in the embodiment of the present utility model is applied to 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.

[0047] Above, referring to Figure 1 , Figure 2 and Figure 3, in some embodiments, the electrical connector 5 and the second pole 4 are located on the same end face of the housing 1.

[0048] In the embodiments of the present utility model, the electrical connector 5 and the second pole 4 are arranged on the same end face of the housing 1, so as to facilitate connecting the electrical connector 5 and the second pole 4 to the battery management unit 8, that is, to facilitate the battery management unit 8 to detect the voltage between the first pole 3 and the second pole 4, simplify the structure of the battery module 200, and reduce the cost of the battery module 200.

[0049] In some further embodiments, the distance between the electrical connector 5 and the second pole 4 is A, and A≥2 cm.

[0050] Through the above technical solution, the influence of the temperature generated by the second pole 4 on the electrical connector 5 is avoided, the stability of the resistance of the electrical connector 5 is ensured, and the safety of the battery cell 100 is improved.

[0051] In some specific embodiments, the distance A between the electrical connector 5 and the second pole 4 can be 2 cm, 2.5 cm, 3 cm or other dimensions.

[0052] Referring to Figure 1 、 Figure 2 and Figure 5 , in some embodiments, the housing 1 includes a first side wall 12 and a second side wall 13. The first side wall 12 and the second side wall 13 are distributed at both ends of the housing 1 in the length direction. The first pole 3 is located on the first side wall 12, and the second pole 4 and the electrical connector 5 are located on the second side wall 13.

[0053] In the related art, due to the characteristics of its own structure of the battery cell 100, the positive pole and the negative pole are distributed on both sides of the housing 1. In order to collect the voltage information of the battery cell 100, the battery module usually needs to be provided with two circuit boards, and the two circuit boards are distributed on both sides of the battery cell 100 and are respectively electrically connected to the positive pole and the negative pole.

[0054] In the embodiments of the present utility model, both the second pole 4 and the electrical connector 5 are located on the second side wall 13. To collect the voltage information of the battery cell 100 in the embodiments of the present utility model, the battery module only needs to be provided with one circuit board, and the circuit board is arranged on the second side wall 13 of the housing 1, so that the circuit board is respectively electrically connected to the second pole 4 and the electrical connector 5, and the voltage between the positive pole and the negative pole can be detected.

[0055] The embodiments of the present utility model can realize the voltage measurement on the same side of the battery cell 100, which is beneficial to simplifying the structure of the battery module 200 and reducing the cost of the battery module 200.

[0056] Referring to Figure 1 、 Figure 2 andFigure 3 , in some specific embodiments, the housing 1 includes: a main body 11 and two cover plates. The main body 11 is generally in the shape of a cuboid, with openings provided at both ends of the main body 11. The two cover plates are respectively arranged at both ends of the main body 11, and the cover plates close the openings at the corresponding ends of the main body 11. A receiving space for placing the battery cell 2 is defined between the main body 11 and the two cover plates, and the two cover plates respectively form the above-mentioned first side wall 12 and second side wall 13.

[0057] The structure of the housing 1 in the embodiment of the present utility model is simple, which reduces the cost of the battery cell 100.

[0058] In some specific embodiments, the first side wall 12 is provided with a first through hole, and the first pole column 3 passes through the first through hole, so that at least part of the first pole column 3 is located outside the housing 1, facilitating the connection of the first pole column 3 to an external structure; the second side wall 13 is provided with a second through hole, and the second pole column 4 passes through the second through hole, so that at least part of the second pole column 4 is located outside the housing 1, facilitating the connection of the second pole column 4 to an external structure. To ensure the sealing performance of the housing 1, a first sealing member is sleeved outside the first pole column 3, and the first sealing member seals the first through hole. A second sealing member is sleeved outside the second pole column 4, and the second sealing member seals the second through hole. Both the first sealing member and the second sealing member are made of insulating material, so that the first pole column 3 and the second pole column 4 are respectively in insulating cooperation with the housing 1.

[0059] Referring to Figure 1 , Figure 2 and Figure 3 , the second side wall 13 is further provided with a third through hole 131, and the electrical connector 5 passes through the third through hole 131, so that at least part of the electrical connector 5 is located outside the housing 1, facilitating the connection of the electrical connector 5 to an external structure. The electrical connector 5 and the second side wall 13 are electrically connected through a conductive rubber ring 51. The conductive rubber ring 51 is sleeved outside the electrical connector 5 and seals the third through hole 131.

[0060] In the embodiment of the present utility model, the electrical connector 5 is electrically connected to the housing 1 through the conductive rubber ring 51. The conductive rubber ring 51 not only plays a role in sealing the housing 1, but also plays a role in conducting electricity, simplifying the structure of the battery cell 100 and reducing the cost of the battery cell 100.

[0061] In some embodiments, the structure of the electrical connector 5 is the same as that of the first pole column 3 and the second pole column 4, and the assembly method of the electrical connector 5 with the housing 1 is also the same as that of the first pole column 3 and the second pole column 4 with the housing 1.

[0062] Through the above technical solutions, the overall assembly efficiency of the battery cell 100 is improved.

[0063] In some embodiments, the cross-sectional area of the electrical connector 5 is smaller than that of the second pole 4, so as to facilitate the distinction between the electrical connector 5 and the second pole 4.

[0064] In some further embodiments, the electrical connector 5 is configured to be a scaled-down version of the second pole 4 by a factor of 0.3 - 0.5.

[0065] Since the electrical connector 5 is only used for voltage detection and does not need to conduct current, the embodiments of the present utility model reduce the size of the electrical connector 5, thereby reducing the cost of the battery cell 100.

[0066] In some embodiments, there are multiple electrical connectors 5, and the multiple electrical connectors 5 are distributed on different side walls of the housing 1, and one of the electrical connectors 5 is electrically connected to the first pole 3.

[0067] Through the above technical solution, during the assembly process of the battery cell 100, the first pole 3 can be selectively connected to one of the electrical connectors 5, improving the assembly efficiency of the battery cell 100.

[0068] In some embodiments, the housing 1 includes a first side wall 12 and a second side wall 13. The first side wall 12 and the second side wall 13 are located at both ends of the housing 1 in the length direction. The positive pole is disposed on the first side wall 12, and the negative pole is disposed on the second side wall 13. There are two electrical connectors 5, and the two electrical connectors are respectively disposed on the first side wall 12 and the second side wall 13.

[0069] 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 on the first side wall 12 can be the first pole, and the negative pole 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.

[0070] In some specific embodiments, the housing 1 is an aluminum structural member. In the embodiments of the present application, the positive pole on the first side wall 12 is the first pole, and the electrical connector 5 on the second side wall 13 is electrically connected to the positive pole on the first side wall 12. The housing 1 has the same electric potential as the positive pole, reducing the risk of corrosion of the aluminum housing 1. In the embodiments of the present application, the electrical connector 5 on the first side wall 12 can be left unused.

[0071] In some other specific embodiments, the housing 1 is a steel structural member. In the embodiments of the present application, the negative pole on the second side wall 13 is the first pole, and the electrical connector 5 on the first side wall 12 is electrically connected to the negative pole on the second side wall 13. The housing 1 has the same electric potential as the negative pole, reducing the risk of corrosion of the steel housing 1. In the embodiments of the present application, the electrical connector 5 on the second side wall 13 can be left unused.

[0072] Refer to Figure 1, Figure 3 and Figure 4 In some embodiments, the electrical connector 5 is electrically connected to the first pole 3 through an extension member 6 extending within the housing 1.

[0073] In the above technical solution, the electrical connector 5 does not need to directly contact the first pole 3, which simplifies the structure of the electrical connector 5, reduces the cost of the battery cell 100, and the electrical connector 5 is indirectly connected to the first pole 3 through the extension member 6, further reducing the influence of the temperature change of the first pole 3 on the electrical connector 5, and further improving the safety of the battery cell 100.

[0074] In some embodiments, the extension member 6 includes a first connection portion 61, an extension portion 62, and a second connection portion 63. Among them, the extension portion 62 is located on one side of the battery cell 2, the first connection portion 61 and the second connection portion 63 are respectively located at both ends of the battery cell 2, the first connection portion 61 is connected to the first pole 3, the second connection portion 63 is connected to the electrical connector 5, and both the first connection portion 61 and the second connection portion 63 are connected to the extension portion 62.

[0075] It should be noted that the connection manner between the first connection portion 61 and the first pole 3 can be welding or plugging, as long as the first connection portion 61 and the first pole 3 can be electrically connected; the connection manner between the second connection portion 63 and the electrical connector 5 can be welding or plugging, as long as the second connection portion 63 and the electrical connector 5 can be electrically connected.

[0076] In the embodiment of the present utility model, the structure of the extension member 6 is simple, reducing the cost of the battery cell 100.

[0077] In some specific embodiments, the first connection portion 61 is formed into a long strip-shaped structure. The first connection portion 61 is located between the tab of the battery cell 2 and the cover plate lead-out piece of the first pole 3, and the tab of the battery cell 2, the first connection portion 61, and the cover plate lead-out piece of the first pole 3 are fixedly connected by laser welding to achieve conduction.

[0078] In the embodiment of the present utility model, the first connection portion 61 is connected to the first pole 3 by welding, improving the reliability of the electrical connection between the first connection portion 61 and the first pole 3.

[0079] In some specific embodiments, the second connection portion 63 is formed into a circular shape. The diameter of the second connection portion 63 is smaller than the diameter of the lead-out piece of the electrical connector 5. The second connection portion 63 is fixedly connected to the lead-out piece of the electrical connector 5 by laser welding to achieve conduction.

[0080] In the embodiment of the present utility model, the second connection portion 63 is connected to the electrical connector 5 by welding, improving the reliability of the electrical connection between the second connection portion 63 and the electrical connector 5.

[0081] Reference Figure 1 In some embodiments, the battery cell 100 further includes: a guiding member 7 disposed on one side of the battery cell 2. The guiding member 7 is provided with a guiding groove 71, and the extending portion 62 of the extending member 6 is located in the guiding groove 71.

[0082] In the above technical solution, by placing a part of the extending member 6 in the guiding groove 71, the guiding member 7 protects the extending portion 62, reducing the risk of interference between the extending portion 62 and other structures, reducing the risk of deformation of the extending portion 62, reducing the risk of fracture of the extending portion 62, and improving the reliability of the battery cell 100.

[0083] In some embodiments, the extending member 6 is configured as a conductive foil.

[0084] The structure of the extending member 6 in the embodiments of the present invention is simple, reducing the cost of the battery cell 100. Moreover, the conductive foil is light in weight, which is beneficial to the lightweight of the battery cell 100.

[0085] In some specific embodiments, the extending member 6 is configured as a conductive foil, and at least a part of the conductive foil is connected to the housing 1 through an insulating adhesive. Among them, the insulating adhesive can be insulating blue glue.

[0086] Through the above technical solution, the risk of deformation of the conductive aluminum foil during the assembly of the battery cell 100 is reduced, and the assembly efficiency of the battery cell 100 is improved.

[0087] The following refers to the attached Figures 1 - 5 Describe a specific embodiment of the present invention.

[0088] The battery cell 100 according to the embodiment of the present invention includes: a housing 1, a battery cell 2, a first pole 3 and a second pole 4. The battery cell 2 is disposed in the housing 1. The first pole 3 and the second pole 4 are both electrically connected to the battery cell 2, and the first pole 3 and the second pole 4 are respectively insulated from the housing 1.

[0089] The battery cell 100 further includes an electrical connection member 5 disposed on the housing 1 and electrically connected to the housing 1. The electrical connection member 5 is electrically connected to the first pole 3.

[0090] The housing 1 is an aluminum structural member, the first pole 3 is a positive pole, and the second pole 4 is a negative pole. At this time, the housing 1 is electrically connected to the positive pole through the electrical connection member 5, and the housing 1 and the positive pole have the same electric potential.

[0091] The electrical connection member 5 penetrates the housing 1 and is disposed adjacent to the second pole 4.

[0092] The housing 1 includes a first side wall 12 and a second side wall 13. The first side wall 12 and the second side wall 13 are distributed at both ends of the housing 1 in the length direction. The first pole 3 is located on the first side wall 12, and the second pole 4 and the electrical connector 5 are located on the second side wall 13.

[0093] The housing 1 includes: a main body 11 and two cover plates. The main body 11 is generally in the shape of a cuboid, and openings are provided at both ends of the main body 11. 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. A receiving space for placing the battery cell 2 is defined between the main body 11 and the two cover plates, and the two cover plates are respectively formed as the above-mentioned first side wall 12 and second side wall 13.

[0094] The first side wall 12 is provided with a first through hole, and the first pole 3 passes through the first through hole, so that at least a part of the first pole 3 is located outside the housing 1 to facilitate connecting the first pole 3 to an external structure; the housing 1 is also provided with a second through hole, and the second pole 4 passes through the second through hole, so that at least a part of the second pole 4 is located outside the housing 1 to facilitate connecting the second pole 4 to an external structure. To ensure the sealing performance of the housing 1, a first sealing member is sleeved on the first pole 3, and the first sealing member seals the first through hole. A second sealing member is sleeved on the second pole 4, and the second sealing member seals the second through hole. The first sealing member and the second sealing member are both made of insulating material, so that the first pole 3 and the second pole 4 are respectively in insulating fit with the housing 1.

[0095] The second side wall 13 is further provided with a third through hole 131, and the electrical connector 5 passes through the third through hole 131, so that at least a part of the electrical connector 5 is located outside the housing 1 to facilitate connecting the electrical connector 5 to an external structure. The electrical connector 5 and the second side wall 13 are electrically connected through a conductive sealing member. The conductive sealing member is sleeved on the electrical connector 5 and seals the third through hole 131. The conductive sealing member is configured as a conductive rubber ring 51.

[0096] The size of the electrical connector 5 is reduced to 0.3 times that of the first pole 3 in equal proportion.

[0097] The electrical connector 5 is electrically connected to the first pole 3 through an extension member 6 extending inside the housing 1.

[0098] The extension member 6 includes a first connection portion 61, an extension portion 62 and a second connection portion 63. Among them, the extension portion 62 is located on one side of the battery cell 2, the first connection portion 61 and the second connection portion 63 are respectively located at both ends of the battery cell 2, the first connection portion 61 is connected to the first pole 3, the second connection portion 63 is connected to the electrical connector 5, and both the first connection portion 61 and the second connection portion 63 are connected to the extension portion 62.

[0099] The first connecting portion 61 is formed in a strip-like structure. The first connecting portion 61 is located between the tab of the battery cell 2 and the lead-out piece of the cover plate of the first pole column 3, and the tab of the battery cell 2, the first connecting portion 61, and the lead-out piece of the cover plate of the first pole column 3 are fixedly connected by laser welding to achieve conduction.

[0100] The second connecting portion 63 is formed in a circular shape. The diameter of the second connecting portion 63 is smaller than the diameter of the lead-out piece of the electrical connector 5. The second connecting portion 63 is fixedly connected to the lead-out piece of the electrical connector 5 by laser welding to achieve conduction.

[0101] The battery cell 100 further includes: a guiding member 7. The guiding member 7 is disposed on one side of the battery cell 2. The guiding member 7 is provided with a guiding groove 71, and the extending portion 62 of the extending member 6 is located in the guiding groove 71.

[0102] The extending member 6 is constructed as a conductive aluminum foil, and the extending portion 62 of the extending member 6 is connected to the housing 1 through an insulating blue adhesive.

[0103] Refer to Figure 1 、 Figure 2 and Figure 5 , according to the battery module 200 of the embodiment of the present invention, includes: the battery cell 100 in the above technical solution.

[0104] According to the battery module 200 of the embodiment of the present invention, when the battery cell 100 works, the first pole column 3 and the second pole column 4 are connected to the circuit, current passes through the first pole column 3 and the second pole column 4, and the temperatures of the first pole column 3 and the second pole column 4 rise. However, because both the first pole column 3 and the second pole column 4 are insulated from the housing 1, the temperature rise of the first pole column 3 and the second pole column 4 does not affect the electrified situation of the housing 1; when the battery cell 100 works, 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 pole column 3, enabling the housing 1 to be stably electrified, improving the safety of the battery cell 100, and thus improving the safety of the battery module 200.

[0105] In some embodiments, the battery module 200 further includes a battery management unit 8. The battery management unit 8 is respectively connected to the electrical connector 5 and the second pole column 4 to detect the voltage difference between the first pole column 3 and the second pole column 4.

[0106] Through the above technical solution, the battery management unit 8 can detect the voltage between the first pole column 3 and the second pole column 4 by detecting the voltage between the electrical connector 5 and the second pole column 4. The battery management unit 8 does not need to be connected to the first pole column 3 with a relatively far position, simplifying the structure of the battery module 200 and reducing the cost of the battery module 200.

[0107] In some specific embodiments, the housing 1 includes a first side wall 12 and a second side wall 13, which are distributed at both ends of the length direction of the housing 1, the first pole 3 is located on the first side wall 12, and the second pole 4 and the electrical connector 5 are located on the second side wall 13. The first pole 3 is a positive pole, and the second pole 4 is a negative pole.

[0108] The battery module 200 includes multiple battery cells 100 and multiple positive and negative electrode connecting plates 9. The multiple battery cells 100 are arranged along the width direction or thickness direction of the battery cells 100. The negative electrode column of each battery cell 100 is electrically connected to the positive electrode column of an adjacent battery cell 100 through the positive and negative electrode connecting plates 9.

[0109] Only one battery management unit 8 is provided, and the battery management unit 8 only needs to be provided on one side of multiple battery cells 100, so that the voltages of multiple battery cells 100 can be sampled and analyzed. The specific sampling method is as follows: the voltage of the battery cell 100 (the first battery cell 100) on the leftmost side of the battery module 200 can be converted by collecting the negative electrode potential of the positive and negative electrode connecting piece 9 at the negative electrode column of the battery cell 100 and the positive electrode potential of the electrical connector 5. The negative electrode potential of the second battery cell 100 is equal to the positive electrode potential of the first battery cell 100, and is also equal to the potential of the electrical connector 5 on the first battery cell 100. At the same time, the positive electrode potential of the second battery cell 100 is equal to the negative electrode potential of the third battery cell 100 adjacent to it, so the voltage of the second battery cell 100 can be converted by the potential of the electrical connector 5 of the first battery cell 100 and the negative electrode potential of the third battery cell 100. The voltage collection of other battery cells 100 in the battery module 200 is similar, and finally the voltage measurement on the same side of the battery module 200 is realized.

[0110] The electric device according to the embodiment of the utility model includes the battery module 200 in the above technical solution, wherein the electric device can be a vehicle, a power bank and other equipment, and the utility model is not limited to this.

[0111] For the electrical equipment according to the embodiments of the present utility model, when the electrical equipment is operating, the battery module 200 provides power, the first pole 3 and the second pole 4 are connected to the circuit, current passes through the first pole 3 and the second pole 4, and the temperatures of the first pole 3 and the second pole 4 rise. However, since both the first pole 3 and the second pole 4 are insulated from the housing 1, the temperature rise of the first pole 3 and the second pole 4 does not affect the electrified state of the housing 1. When the battery cell 100 is operating, the electrical connector 5 is not connected to the battery operating 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 pole 3, enabling the housing 1 to be stably electrified, improving the safety of the battery cell 100, improving the safety of the battery module 200, and thus improving the safety of the electrical equipment.

[0112] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0113] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that: include: Housing (1); A battery core (2), wherein the battery core (2) is arranged in the housing (1); A first pole (3) and a second pole (4), wherein the first pole (3) and the second pole (4) are both electrically connected to the battery cell (2), and the first pole (3) and the second pole (4) are respectively insulated and matched with the shell (1); An electrical connector (5), the electrical connector (5) being disposed on the housing (1) and electrically connected to the housing (1), and the electrical connector (5) being electrically connected to the first pole (3).

2. The battery cell (100) according to claim 1, characterized in that: The electrical connector (5) and the housing (1) are electrically connected via a conductive seal, and the resistance value of the conductive seal is greater than the resistance value of the electrical connector (5).

3. The battery cell (100) according to claim 2, characterized in that: The conductive sealing element is configured as a conductive rubber ring (51).

4. The battery cell (100) according to claim 1, characterized in that: The electrical connector (5) is located on a side of the housing (1) away from the first pole (3).

5. The battery cell (100) according to claim 4, characterized in that: The electrical connector (5) and the second pole (4) are located on the same end surface of the housing (1).

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

7. The battery cell (100) according to claim 5, characterized in that: The cross-sectional area of ​​the electrical connector (5) is smaller than the cross-sectional area of ​​the second pole (4).

8. The battery cell (100) according to claim 5, characterized in that: The shell (1) comprises a first side wall (12) and a second side wall (13), wherein the first side wall (12) and the second side wall (13) are distributed at two ends of the shell (1) in a length direction, the first pole (3) is located on the first side wall (12), and the second pole (4) and the electrical connector (5) are located on the second side wall (13).

9. The battery cell (100) according to claim 1, characterized in that: The electrical connectors (5) are multiple and distributed on different side walls 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, characterized in that: The shell (1) comprises a first side wall (12) and a second side wall (13), wherein the first side wall (12) and the second side wall (13) are distributed at two ends of the shell (1) in a length direction, and two electrical connectors (5) are provided, and the two electrical connectors (5) are respectively provided on the first side wall (12) and the second side wall (13), and one of the two electrical connectors (5) is electrically connected to the first pole (3).

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

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

13. An electrical equipment, characterized in that: include: The battery module (200) according to claim 11 or 12.

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