Battery cell and battery pack having same, and electric device

Abstract

A battery cell (100) and a battery pack having same, and an electric device. The battery cell (100) comprises a casing, a first terminal post (3), a second terminal post (4) and an electrical connector (5), wherein in a first direction, the first terminal post (3) and the second terminal post (4) are distributed at two ends of the casing; the electrical connector (5) is arranged on the casing; in the first direction, the electrical connector (5) and the second terminal post (4) are located at the same end of the casing; and the electrical connector (5) and the first terminal post (3) are electrically connected by means of an extension member (6) extending in the first direction in the casing.

Description

Battery cells and battery packs and electrical devices containing them.

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 2024221037151, filed on August 28, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of batteries, and more specifically, to a battery cell and a battery pack and electrical device having the same. Background Technology

[0004] In related technologies, the positive and negative terminals of the blade battery are distributed on both sides of the casing. In order to collect voltage information from multiple blade batteries, two circuit boards and a processor chip are required. The two circuit boards are distributed on both sides of the blade battery and collect voltage information from the positive and negative terminals of the battery respectively. When the signals from the two circuit boards are transmitted to the processor chip, due to the long distance and the different distances between each blade battery and the processor chip, as well as the resistance of the wires and the welding resistance in the transmission path, different degrees of resistive voltage division will occur when measuring the voltage. This will bring different errors to the measurement of the voltage at both ends of the blade battery and affect the accuracy of the voltage detection of the blade battery.

[0005] Application content

[0006] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a battery cell in which the second terminal and the electrical connector are located at the same end of the casing, enabling sampling and analysis of the battery cell voltage from one side, reducing the measurement difficulty, reducing the signal transmission path, and thus reducing the resistive voltage division when measuring the battery cell voltage, thereby reducing the detection error.

[0007] This application also proposes a battery pack having the aforementioned battery cells.

[0008] This application also proposes an electrical device having the aforementioned battery pack.

[0009] A battery cell according to a first aspect embodiment of this application includes: a housing, a first terminal, a second terminal, and an electrical connector. In a first direction, the first terminal and the second terminal are distributed at both ends of the housing, and the electrical connector is disposed in the housing. In the first direction, the electrical connector and the second terminal are located at the same end of the housing, and the electrical connector and the first terminal are electrically connected through an extension extending in the housing along the first direction.

[0010] According to the embodiments of this application, the second terminal and the electrical connector of the battery cell are located at the same end of the casing, which enables sampling and analysis of the battery cell voltage from one side, reduces the measurement difficulty, reduces the signal transmission path, and thus reduces the resistive voltage division when measuring the battery cell voltage, thereby reducing the detection error.

[0011] In addition, the battery cell according to the above embodiments of this application may also have the following additional technical features:

[0012] According to some embodiments of this application, the battery cell further includes a guide member disposed on one side of the battery cell, the guide member having a guide groove, and at least a portion of the extension member being located within the guide groove.

[0013] According to some alternative embodiments of this application, the extension is connected to the housing via an insulating adhesive.

[0014] According to some embodiments of this application, the electrical connector and the second pole are located on the same sidewall of the housing in the first direction.

[0015] According to some embodiments of this application, the first pole and the second pole are respectively insulated from the housing, and the electrical connector is disposed on the housing and electrically connected to the housing.

[0016] According to some optional embodiments of this application, the electrical connector passes through the housing, and the electrical connector and the housing are electrically connected by a conductive rubber ring.

[0017] According to some specific embodiments of this application, the battery cell further includes a battery cell, the second terminal is electrically connected to the negative terminal of the battery cell, and the first terminal is electrically connected to the positive terminal of the battery cell.

[0018] A battery pack is provided according to a second aspect of this application, the battery pack comprising: a housing; a battery module comprising a plurality of battery cells arranged along a second direction, the battery cells being the battery cells described in the first aspect of this application; and a battery management unit located on a first side of the battery module in the first direction, the battery management unit being used to detect the voltage of each battery cell, the battery management unit being electrically connected to the second terminal and the electrical connector of at least a portion of the battery cells, wherein the second direction and the first direction intersect.

[0019] According to the battery pack of the present application embodiment, by utilizing the battery cell described in the first aspect of the present application, and by placing the second terminal and the electrical connector at the same end of the housing, the voltage of the battery cell can be sampled and analyzed from one side, reducing the measurement difficulty, reducing the signal transmission path, thereby reducing the resistive voltage division when measuring the voltage of the battery cell and reducing the detection error.

[0020] According to some embodiments of this application, a plurality of battery cells are connected in series, and in the second direction, the first terminals and electrical connectors of the plurality of battery cells are arranged alternately.

[0021] According to some embodiments of this application, the battery management unit includes: a circuit board located on a first side of the battery module, the circuit board being electrically connected to the second terminal and the electrical connector respectively; and a processor chip electrically connected to the circuit board.

[0022] According to some alternative embodiments of this application, the processor chip is located in the central region of the circuit board.

[0023] According to a third aspect of this application, an electrical device is provided, the electrical device including a battery pack according to an embodiment of a second aspect of this application.

[0024] According to the embodiments of this application, by utilizing the battery pack described in the second aspect of this application, the voltage of the battery cell can be sampled and analyzed from one side by placing the second terminal and the electrical connector at the same end of the housing, which reduces the measurement difficulty, reduces the signal transmission path, and thus reduces the resistive voltage division when measuring the voltage of the battery cell, thereby reducing the detection error.

[0025] 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

[0026] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 is a schematic diagram of the structure of the battery module and battery management unit according to an embodiment of this application;

[0028] Figure 2 is an exploded view of a battery cell according to an embodiment of this application;

[0029] Figure 3 is a schematic diagram of the fit between the electrical connector and the housing.

[0030] Reference numerals: 100, battery cell; 11, main body; 12, first sidewall; 13, second sidewall; 131, third through hole; 2, battery cell; 3, first terminal; 4, second terminal; 5, electrical connector; 51, conductive rubber ring; 52, lead-out piece; 6, extension piece; 61, first connecting part; 62, extension part; 63, second connecting part; 7, guide piece; 71, guide groove; 8, circuit board; 9, positive and negative terminal connecting piece; 95, fixing disc; 96, insulating ceramic ring. Detailed Implementation

[0031] 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 are only used to explain this application, and should not be construed as limiting this application.

[0032] The following description, with reference to the accompanying drawings, describes a battery cell 100 according to an embodiment of this application.

[0033] As shown in Figures 1-3, the battery cell 100 according to an embodiment of this application includes a casing, a first terminal 3, a second terminal 5, and an electrical connector 5.

[0034] In the first direction, the first pole post 3 and the second pole post 4 are distributed at both ends of the shell.

[0035] Electrical connector 5 is disposed in the housing. In the first direction, electrical connector 5 and second terminal 4 are located at the same end of the housing. Electrical connector 5 and first terminal 3 are electrically connected through an extension 6 extending in the first direction within the housing.

[0036] In the above technical solution, the electrical connector 5 does not need to be in direct contact with the first terminal 3. Instead, the extension 6 is used to achieve the electrical connection between the first terminal 3 and the electrical connector 5. This simplifies the structure of the electrical connector 5 and reduces the cost of the battery cell 100.

[0037] The second terminal 4 and the electrical connector 5 of the battery cell 100 are located at the same end of the housing, which facilitates the measurement of the voltage of each battery cell 100 from one side of the battery cell 100.

[0038] Specifically, since the electrical connector 5 is electrically connected to the first terminal 3 through the extension 6, the potential at the electrical connector 5 is the same as the potential at the first terminal 3. Therefore, the voltage of the battery cell 100 can be obtained by measuring the electrical connector 5 and the second terminal 4.

[0039] In the prior art, the voltage of a battery cell needs to be measured from both sides of the battery cell through the first and second terminals. However, this application reduces the measurement difficulty by placing the second terminal 4 and the electrical connector 5 at the same end, and measuring the voltage of the battery cell 100 from one side of the battery cell 100.

[0040] Therefore, according to the embodiments of this application, the battery cell 100 has the second terminal 4 and the electrical connector 5 located at the same end of the housing, which enables sampling and analysis of the voltage of the battery cell 100 from one side, reducing the measurement difficulty, reducing the signal transmission path, and thus reducing the resistive voltage division when measuring the voltage of the battery cell 100, thereby reducing the detection error.

[0041] The following description, with reference to the accompanying drawings, describes a specific embodiment of a battery cell 100 according to the present application.

[0042] In some specific embodiments of this application, as shown in Figures 1-3, the battery cell 100 includes a housing, a first terminal 3, a second terminal 5, and an electrical connector 5.

[0043] In some embodiments of this application, as shown in FIG2, the battery cell 100 further includes a guide 7, which is disposed on one side of the cell 2 of the battery cell 100. The guide 7 is provided with a guide groove 71, and at least a portion of the extension 6 is located in the guide groove 71.

[0044] 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.

[0045] In some embodiments, the guide groove 71 extends along a first direction in its length direction, the guide groove 71 has a depth of 1 mm and a width of 5 mm, and the extension 62 is adapted to match the size of the guide groove 71. Specifically, the extension 62 has a depth of 1 mm and a width of 5 mm, so that the extension 62 fits against the inner wall of the guide groove 71 to embed the extension 62 into the guide groove 71.

[0046] In some embodiments, the extension 6 is constructed as a conductive aluminum foil.

[0047] The extension 6 in this embodiment has a simple structure, which reduces the cost of the battery cell 100, and the conductive aluminum foil is lightweight, which is beneficial to the weight reduction of the battery cell 100.

[0048] In some optional embodiments of this application, the extension 6 is connected to the housing via an insulating adhesive to secure the extension 6 within the housing. The insulating adhesive may be insulating blue glue.

[0049] 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.

[0050] In some embodiments of this application, the electrical connector 5 and the second terminal 4 are located on the same side wall of the housing in a first direction, so as to facilitate the detection and analysis of the voltage of the battery cell 100 from the side wall via the electrical connector 5 and the second terminal 4.

[0051] In some embodiments, the first pole 3 and the second pole 4 are located on two side walls of the housing opposite each other in a first direction, and the second pole 4 and the electrical connector 5 are located on the same side wall.

[0052] In some optional embodiments of this application, the electrical connector 5 and the second pole post 4 are arranged at intervals, and the end of the electrical connector 5 is located near the housing to reserve connection space for the electrical connector 5.

[0053] The electrical connector 5 is positioned at the end adjacent to the housing. This allows for the provision of installation space for the electrical connector 5, thereby preventing the electrical connector 5 and the second terminal 4 from being too close and thus avoiding electrical connection between them. It also facilitates the installation of the electrical connector 5 and the second terminal 4, reducing the difficulty of installation.

[0054] In some embodiments, the battery module includes a plurality of battery cells 100 arranged along a second direction. A battery management unit is disposed on one side of the battery module in a first direction and is used to detect and analyze the voltage of the battery cells 100. When the plurality of battery cells 100 are connected in series, the electrical connectors 5 and the second terminals 4 of some battery cells 100 are located on the first side of the battery module, and the battery management unit is also located on the first side of the battery module. This facilitates the electrical connection between the battery management unit and the electrical connectors 5 and the second terminals 4 of some battery cells 100, thereby facilitating the battery management unit to measure the voltage of each battery cell 100.

[0055] In some embodiments, as shown in FIG1, the electrical connectors 5 and the second terminal 4 of the battery cell 100 are arranged at intervals. The electrical connectors 5 are electrically connected to the battery management unit through the lead-out piece 52. The battery management unit is directly connected to the second terminal 4. This eliminates the need for the battery management unit to cover the gap between the second terminal 4 and the electrical connectors 5, which makes it easier to reduce the size of the battery management unit.

[0056] In some embodiments, lead-out sheet 52 is a nickel sheet.

[0057] In some embodiments, when multiple battery cells 100 are connected in parallel, the electrical connector 5 and the second terminal 4 of each battery cell 100 are located on the first side of the battery module, and the battery management unit is also located on the first side of the battery module. This facilitates the electrical connection between the battery management unit and the electrical connector 5 and the second terminal 4 of the battery cell 100, thereby facilitating the battery management unit to measure the voltage of each battery cell 100.

[0058] In some embodiments of this application, the first pole 3 and the second pole 4 are respectively insulated from the housing, and the electrical connector 5 is disposed on the housing and electrically connected to the housing.

[0059] The electrical connector 5 is electrically connected to the first pole 3 through an extension 6 extending in the first direction inside the housing. That is, the housing is electrically connected to the first pole 3 through the electrical connector 5, so that the housing has the same potential as the first pole 3, thereby reducing the risk of corrosion of the housing.

[0060] 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 is an aluminum structural component, the first terminal 3 is the positive terminal, and the second terminal 4 is the negative terminal. In this case, the housing is electrically connected to the positive terminal through the electrical connector 5, and the housing and the positive terminal have the same potential, reducing the risk of corrosion of the aluminum housing. In other embodiments, the housing is a steel structural component, the first terminal 3 is the negative terminal, and the second terminal 4 is the positive terminal. In this case, the housing is electrically connected to the negative terminal through the electrical connector 5, and the housing and the negative terminal have the same potential, reducing the risk of corrosion of the steel housing.

[0061] Furthermore, by electrically connecting the electrical connector 5 to the housing, the housing can be stably charged.

[0062] Specifically, the electrical connector 5 is indirectly connected to the first terminal 3 through the extension 6, which 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.

[0063] Specifically, 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 insulated from the casing, the temperature rise of the first terminal 3 and the second terminal 4 does not affect the charging status of the casing. When the battery cell 100 is working, the electrical connector 5 is not connected to the 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 casing and the first terminal 3, so that the casing can be stably charged, thus improving the safety of the battery cell 100.

[0064] In some embodiments of this application, the electrical connector 5 passes through the housing, and the electrical connector 5 and the housing are electrically connected by a conductive rubber ring 51. The conductive rubber ring 51 not only seals the housing but also conducts electricity, which simplifies the structure of the battery cell 100 and reduces the cost of the battery cell 100.

[0065] In some specific embodiments, 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 10⁵ Ω to 10⁶ Ω.

[0066] When the first terminal 3 is connected to the positive terminal tab of the battery cell 2, the potential of the casing is 60% to 100% of the potential at the first terminal 3 when the electrical connector 5 is positively charged.

[0067] In this embodiment, a certain resistance is provided between the shell and the electrical connector 5 by means of a conductive rubber ring 51, which avoids the safety hazards caused to the battery module by the huge short circuit current generated by the shell conducting the positive and negative terminals under faults such as short circuit and puncture. It greatly reduces the level of short circuit current and leakage current, avoids the occurrence of short circuit arcing, and improves the safety of the battery cell 100.

[0068] In some specific embodiments of this application, the housing 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. 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 a first sidewall 12 and a second sidewall 13 arranged opposite to each other along a first direction.

[0069] The housing structure in this embodiment is simple, which reduces the cost of the battery cell 100.

[0070] 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, 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, facilitating connection between the second pole post 4 and an external structure. To ensure the sealing of the housing, 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.

[0071] Referring to Figures 2 and 3, the second sidewall 13 is also 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, so as to facilitate the connection of the electrical connector 5 to the external structure. The electrical connector 5 and the second sidewall 13 are electrically connected by a conductive rubber ring 51, which is sleeved on the electrical connector 5 and seals the third through hole 131.

[0072] 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 with the housing is also the same as that of the first pole 3, the second pole 4 and the housing 1.

[0073] Specifically, the battery cell 100 includes a fixing disc 95 for fixing the electrical connector 5 and an insulating ceramic ring 96. The insulating ceramic ring 96 is located between the fixing disc 95 and the electrical connector 5. Through the above technical solution, the overall assembly efficiency of the battery cell 100 is improved.

[0074] In some examples, the electrical connector 5 is constructed as a scaled-down version of the first pole 3 by 0.3-0.5 times.

[0075] 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.

[0076] In some optional embodiments of this application, the battery cell 100 further includes a battery cell 2, a second terminal 4 electrically connected to the negative terminal tab of the battery cell 2, and a first terminal 3 electrically connected to the positive terminal tab of the battery cell 2, so that the electrical connector 5 is positively charged, thereby making the casing positively charged, reducing the activity of the casing, and thus reducing the probability of the casing corroding.

[0077] In some embodiments, the electrical connector 5 and the first pole 3 are located on opposite sidewalls of the housing in a first direction, and the extension 6 extends along the first direction to connect the electrical connector 5 and the first pole 3.

[0078] In some embodiments, as shown in FIG2, 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 cell 2 of the battery cell 100, the first connecting portion 61 and the second connecting portion 63 are respectively located at both ends of the 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.

[0079] 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.

[0080] In this embodiment, the extension 6 has a simple structure, which reduces the cost of the battery cell 100.

[0081] In some examples, the first terminal 3 is connected to the tab of the cell 2 via a first electrical connecting piece. The first connecting part 61 can be electrically connected to the tab, or to the first electrical connecting piece or the first terminal 3. No further restrictions are imposed here.

[0082] 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 first electrical connection piece of the first electrode post 3. The tab of the battery cell 2, the first connecting part 61 and the first electrical connection piece of the first electrode post 3 are fixedly connected by laser welding to achieve conduction.

[0083] In some examples, the length of the first connecting part 61 is 4cm and the width of the first connecting part 61 is 2cm.

[0084] 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.

[0085] 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 electrical connector 5. The second connecting part 63 is fixed to the electrical connector 5 by laser welding to achieve conductivity.

[0086] 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.

[0087] A specific embodiment of this application is described below with reference to Figures 2 and 3.

[0088] According to an embodiment of this application, a battery cell 100 includes: a casing, a battery cell 2, a first terminal 3, and a second terminal 4, wherein the battery cell 2 is disposed inside the casing, 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 casing.

[0089] The battery cell 100 also includes an electrical connector 5, which is disposed on the housing and electrically connected to the housing, and is electrically connected to the first terminal post 3.

[0090] The housing is an aluminum structure. The first terminal 3 is the positive terminal and the second terminal 4 is the negative terminal. At this time, the housing is electrically connected to the positive terminal through the electrical connector 5, and the housing and the positive terminal have the same potential.

[0091] Electrical connector 5 passes through the housing, and electrical connector 5 and second pole 4 are located on the same side wall of the housing.

[0092] The housing includes a first sidewall 12 and a second sidewall 13, which are distributed at both ends of the housing in the length direction. 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.

[0093] The housing also includes a main body 11 and two cover plates. The main body 11 is in the shape of a cuboid. 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. 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 a 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.

[0094] 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, facilitating connection between the first pole post 3 and an external structure. The housing 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, facilitating connection between the second pole post 4 and an external structure. To ensure the airtightness of the housing, 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 respectively insulated from the housing.

[0095] 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, facilitating connection of the electrical connector 5 to an external structure. The electrical connector 5 and the second sidewall 13 are electrically connected via a conductive seal, which is fitted over the electrical connector 5 and seals the third through hole 131. The conductive seal is constructed as a conductive rubber ring 51.

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

[0097] Electrical connector 5 is electrically connected to first pole 3 via extension 6 extending inside the housing.

[0098] 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.

[0099] 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 first electrical connection piece of the first pole post 3. The tab of the battery cell 2, the first connecting part 61 and the first electrical connection piece of the first pole post 3 are fixed together by laser welding to achieve conduction.

[0100] The second connecting part 63 is circular, and its diameter is smaller than that of the electrical connector 5. The second connecting part 63 is fixed to the electrical connector 5 by laser welding to achieve conductivity.

[0101] 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.

[0102] The extension 6 is constructed of conductive aluminum foil, and the extension portion 62 of the extension 6 is connected to the housing by insulating blue glue.

[0103] The following describes a battery pack according to an embodiment of this application. The battery pack according to an embodiment of this application includes a housing, a battery module, and a battery management unit.

[0104] The battery module includes multiple battery cells 100 according to the above embodiments of this application. The multiple battery cells 100 are arranged along the stacking direction. The battery module is disposed in a housing to isolate the battery module from the external environment, thereby providing protection for the battery module, reducing the impact of the external environment on the battery module, and facilitating the stable operation of the battery module.

[0105] In the first direction, the battery management unit is located on the first side of the battery module. The battery management unit is used to detect the voltage of at least each battery cell 100. The battery management unit is electrically connected to the second terminal 4 and the electrical connector 5 of at least a portion of the battery cells 100. Since the electrical connector 5 is electrically connected to the first terminal 3, the potential between the first terminal 3 and the second terminal 4 can be obtained by measuring the potential between the second terminal 4 and the electrical connector 5, thereby enabling the voltage of the battery cell 100 to be measured from one side.

[0106] It should be explained here that the electrical connection between the second terminal 4 and the battery management unit can be a direct connection or an electrical connection through conductive parts such as wires; the electrical connection between the electrical connector 5 and the battery management unit can be a direct connection or an electrical connection through conductive parts such as wires, without much restriction here.

[0107] The battery management unit is located on the same side of multiple battery cells 100 to measure the voltage of each battery cell 100. This reduces installation steps, space required for installation, and the use of flexible circuit boards on the other side. It also reduces the detection error of the battery management unit.

[0108] Specifically, due to the structural characteristics of the battery cell, the positive and negative terminals are located on both sides of the casing. To collect the voltage information of the battery cell, the battery management unit includes two circuit boards and a processor chip. The two circuit boards are located on both sides of the battery cell and are electrically connected to the positive and negative terminals respectively. When the signals from the two circuit boards are transmitted to the processor chip, the signals are transmitted from different sides, resulting in a long signal transmission path. Furthermore, the distance between each battery cell and the processor chip is different. There are wire resistances and welding resistances along the transmission path, which cause varying degrees of resistive voltage division when measuring the voltage. This introduces different errors into the measurement of the voltage across the battery cell, making it impossible to uniformly calibrate using algorithms.

[0109] In this application, the battery management unit is located on the first side of the battery module. The battery management unit samples and analyzes the voltage of at least each battery cell 100 from one side, which reduces the signal transmission path and thus reduces the resistive voltage division when measuring the voltage of the battery cell 100, thereby reducing the detection error of the battery management unit.

[0110] Furthermore, when the battery management unit measures the voltage of the battery cell 100, the signal needs to be transmitted to the battery management unit through the extension 6. In this way, the voltage error generated by the extension 6 can be compensated by a unified algorithm, thereby improving the detection accuracy of the battery management unit.

[0111] According to the battery pack of the present application embodiment, by utilizing the battery cell 100 of the above embodiment of the present application, the battery management unit is disposed on the first side of the battery module. The battery management unit samples and analyzes the voltage of at least each battery cell 100 from one side, eliminating the flexible circuit board for sampling on the other side, reducing the signal transmission path, thereby reducing the resistive voltage division when measuring the voltage of the battery cell 100, and reducing the detection error of the battery management unit.

[0112] In some embodiments of this application, as shown in FIG1, multiple battery cells 100 are connected in series. In the second direction, the first terminals 3 and electrical connectors 5 of the multiple battery cells 100 are arranged alternately to facilitate sampling and analysis of the voltage of each battery cell 100 from one side of the battery module.

[0113] Specifically, the first terminal 3 and the electrical connector 5 of the battery cell 100 are arranged alternately to facilitate the electrical connection between the battery management unit and the electrical connector 5, and then the battery management unit is used to sample and analyze the voltage of each battery cell 100.

[0114] For example, in the first direction, the battery module includes a first side and a second side. The battery module includes multiple battery cells 100 arranged along the second direction, such as a first battery cell, a second battery cell, and a third battery cell. The electrical connector 5 and the second terminal 4 of the first battery cell are located on the first side of the battery module. The first terminal 3 of the second battery cell is located on the first side of the battery module. The electrical connector 5 and the second terminal 4 of the second battery cell are located on the second side of the battery module. The electrical connector 5 and the second terminal 4 of the third battery cell are located on the first side of the battery module.

[0115] The battery management unit is located on the first side of the battery module and is electrically connected to the electrical connector 5 and the second terminal 4 located on the first side. That is, the battery management unit is electrically connected to the electrical connector 5 and the second terminal 4 of the first battery cell, and the battery management unit is electrically connected to the electrical connector 5 and the second terminal 4 of the third battery cell.

[0116] For the second battery cell, since multiple battery cells 100 are connected in series, the first terminal 3 of the first battery cell is electrically connected to the second terminal 4 of the second battery cell. The potential at the second terminal 4 of the second battery cell is the same as the potential at the first terminal 3 of the first battery cell. The first terminal 3 of the first battery cell is electrically connected to the electrical connector 5 of the first battery cell. That is, the potential at the second terminal 4 of the second battery cell is the same as the potential at the electrical connector 5 of the first battery cell.

[0117] The first terminal 3 of the second battery cell is electrically connected to the second terminal 4 of the third battery cell. Therefore, the battery management unit can measure the potential at the second battery cell through the second terminal 4 of the third battery cell and the electrical connection 5 of the first battery cell. Thus, the battery management unit can measure the voltage of each battery cell 100 in the battery module from one side of the battery module.

[0118] For ease of description, the multiple battery cells 100 in the battery module are divided into odd-numbered battery cells and even-numbered battery cells. The first battery cell and the third battery cell mentioned above are odd-numbered battery cells, and the second battery cell mentioned above is an even-numbered battery cell. The odd-numbered battery cells and the even-numbered battery cells are arranged alternately along the second direction.

[0119] The electrical connectors 5 of odd-numbered battery cells and the first terminals 3 of even-numbered battery cells are arranged alternately along a second direction. The battery management unit is electrically connected to the electrical connectors 5 and second terminals 4 of the odd-numbered battery cells, enabling direct measurement of the voltage of the odd-numbered battery cells. For even-numbered battery cells, the voltage of the even-numbered battery cell can be measured by measuring the electrical connector 5 of one of the two adjacent odd-numbered battery cells and the second terminal 4 of the other.

[0120] In some embodiments, as shown in FIG1, the second terminal 4 and electrical connector 5 of the odd number of battery cells are both located on the first side of the battery module. This facilitates the electrical connection between the battery management unit and the second terminal 4 and electrical connector 5 of the odd number of battery cells, thereby reducing the current transmission path, reducing the current loss during transmission, and thus reducing the detection error of the battery management cell.

[0121] In some examples, as shown in Figure 1, the battery cell 100 also includes a plurality of positive and negative electrode connecting pieces 9. Some of the positive and negative electrode connecting pieces 9 are located on the first side of the battery module and arranged along the second direction, while other positive and negative electrode connecting pieces 9 are located on the second side of the battery module and arranged along the second direction, so as to connect the plurality of battery cells 100 in series using the plurality of positive and negative electrode connecting pieces 9, thereby forming a battery module.

[0122] In some other embodiments of this application, multiple battery cells 100 are connected in parallel, and the electrical connector 5 of each battery cell 100 is located on the first side of the battery module, thereby facilitating the battery management unit to connect to the electrical connector 5 located on the first side, and thus facilitating the battery management unit to measure the voltage of each battery cell 100.

[0123] In some embodiments of this application, as shown in FIG1, the battery management unit includes a circuit board 8 and a processor chip. The circuit board 8 is located on the first side of the battery module. The circuit board 8 is electrically connected to the second terminal 4 and the electrical connector 5 respectively. The processor chip is electrically connected to the circuit board 8. The processor chip obtains the potential signal at the second terminal 4 and the electrical connector 5 through the circuit board 8, and then analyzes and obtains the voltage between the second terminal 4 and the electrical connector 5 to obtain the voltage of the corresponding battery cell 100.

[0124] In some embodiments, the battery management unit includes a circuit board 8, which can be used to measure the voltage of each battery cell 100 in the battery module. Compared with the prior art, which requires a circuit board 8 on each side of the battery cell 100, this application can reduce the number of circuit boards 8, thereby reducing the cost of the battery pack.

[0125] In some embodiments, circuit board 8 is circuit board 8.

[0126] In some alternative embodiments of this application, the processor chip is located in the central area of ​​the circuit board 8, which facilitates balancing the transmission paths from different battery cells 100 to the processor chip, thereby reducing the error when the battery management unit measures the voltage of the battery cells 100.

[0127] For example, the battery module includes five battery cells 100 arranged along the second direction, and the processor chip is located on the first side of the third battery cell 100, so that the distance between each battery cell 100 and the processor chip is not too far, and the first and fifth battery cells 100 are at the same distance from the processor chip, and the second and fourth battery cells 100 are at the same distance from the processor chip.

[0128] When the battery module includes six battery cells 100 arranged along the second direction, the processor chip is located on the first side between the third and fourth battery cells 100, so that the distance between each battery cell 100 and the processor chip is not too far, and the distance between the first and sixth battery cells 100 and the processor chip is the same, the distance between the second and fifth battery cells 100 and the processor chip is the same, and the distance between the third and fourth battery cells 100 and the processor chip is the same.

[0129] A specific embodiment of this application is described below with reference to Figures 1-3.

[0130] The battery cell 100 includes multiple battery cells 100 and multiple positive and negative electrode connecting pieces 9. Some of the positive and negative electrode connecting pieces 9 are located on the first side of the battery module and arranged along the second direction, while other positive and negative electrode connecting pieces 9 are located on the second side of the battery module and arranged along the second direction, so as to connect multiple battery cells 100 in series using multiple positive and negative electrode connecting pieces 9, thereby forming a battery module.

[0131] The battery management unit includes a circuit board 8 and a processor chip. The circuit board 8 is located on the first side of the battery module, and the processor chip is located in the central area of ​​the battery module. Here, multiple battery cells 100 are divided into odd-numbered battery cells and even-numbered battery cells, and the odd-numbered battery cells and even-numbered battery cells are arranged alternately along the second direction.

[0132] The second sidewall 13 of the odd-numbered battery cells is located on the first side, and the first sidewall 12 of the even-numbered battery cells is located on the second side. The electrical connector 5 and the second terminal 4 are located on the second sidewall 13. Therefore, the circuit board 8 is electrically connected to the electrical connector 5 and the second terminal 4 of the odd-numbered battery cells, so that the voltage of the odd-numbered battery cells can be directly measured. For the even-numbered battery cells, since multiple battery cells 100 are connected in series, the voltage of the even-numbered battery cell can be measured by measuring the electrical connector 5 of one of the two adjacent odd-numbered battery cells and the second terminal 4 of the other.

[0133] In summary, the circuit board 8 is located on the first side of the battery module. The circuit board 8 can transmit the electrical signals from both ends of the battery cell 100 to the processor chip. Since the processor chip is located in the central area of ​​the circuit board 8, and the circuit board 8 is electrically connected to the adjacent second terminal 4 and electrical connector 5, the transmission path of the electrical signal is reduced, thereby reducing the resistive voltage division when measuring the voltage of the battery cell 100 and reducing the detection error of the battery management unit.

[0134] In addition, the signal at one end of each battery cell 100 is transmitted to the circuit board 8 through the extension 6. The voltage error generated by the extension 6 can be compensated by a unified algorithm, thereby improving the detection accuracy of the battery management unit.

[0135] In summary, the battery management unit only needs to be located on the first side of multiple battery cells 100 to sample and analyze the voltage of multiple battery cells 100. This enables voltage measurement of multiple batteries from one side, thereby reducing the transmission path of electrical signals, reducing the voltage division due to resistance when measuring the voltage of battery cells 100, and reducing the detection error of the battery management unit.

[0136] Other configurations and operations of the battery pack according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0137] The following describes an electrical device according to embodiments of this application. The electrical device according to embodiments of this application includes a battery pack according to the above embodiments of this application. The electrical device can be a vehicle, a power bank, or other similar device; this application does not limit the scope of the application to such devices.

[0138] According to the embodiments of the present application, the electrical device utilizes the battery pack according to the above embodiments of the present application, and places the battery management unit on the first side of the battery module. The battery management unit samples and analyzes the voltage of at least each battery cell 100 from one side, thereby reducing the signal transmission path, reducing the resistive voltage division when measuring the voltage of the battery cell 100, and reducing the detection error of the battery management unit.

[0139] 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," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used 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. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. In the description of this application, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0140] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0141] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0142] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is 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.

[0143] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell (100), wherein, include: The housing, the first terminal (3), the second terminal (4), and the electrical connector (5) are arranged in a first direction, with the first terminal (3) and the second terminal (4) distributed at both ends of the housing. The electrical connector (5) is disposed on the housing. In the first direction, the electrical connector (5) and the second pole (4) are located at the same end of the housing. The electrical connector (5) and the first pole (3) are electrically connected by an extension (6) extending in the first direction within the housing.

2. The battery cell (100) according to claim 1, wherein, The battery cell (100) further includes a guide (7), which is disposed on one side of the cell (2) of the battery cell (100). The guide (7) is provided with a guide groove (71), and at least a portion of the extension (6) is located in the guide groove (71).

3. The battery cell (100) according to claim 2, wherein, The extension (6) is connected to the housing by an insulating adhesive.

4. The battery cell (100) according to any one of claims 1-3, wherein, The electrical connector (5) and the second pole (4) are located on the same side wall of the housing in the first direction.

5. The battery cell (100) according to any one of claims 1-4, wherein, The first pole (3) and the second pole (4) are respectively insulated from the housing, and the electrical connector (5) is disposed on the housing and electrically connected to the housing.

6. The battery cell (100) according to claim 5, wherein, The electrical connector (5) passes through the housing, and the electrical connector (5) and the housing are electrically connected by a conductive rubber ring (51).

7. The battery cell (100) according to claim 6, wherein, The battery cell (100) further includes a battery cell (2), the second terminal (4) is electrically connected to the negative terminal tab of the battery cell (2), and the first terminal (3) is electrically connected to the positive terminal tab of the battery cell (2).

8. A battery pack, wherein, include: Box; A battery module comprising a plurality of battery cells (100) arranged along a second direction, wherein the battery cells (100) are battery cells (100) according to any one of claims 1-7; A battery management unit, located on a first side of the battery module in the first direction, is used to detect the voltage of at least each battery cell (100). The battery management unit is electrically connected to the second terminal (4) of at least a portion of the battery cells (100) and the electrical connector (5). The second direction and the first direction are intersecting.

9. The battery pack according to claim 8, wherein, Multiple battery cells (100) are connected in series, and in the second direction, the first terminal (3) and the electrical connector (5) of the multiple battery cells (100) are arranged alternately.

10. The battery pack according to claim 8 or 9, wherein, The battery management unit includes: Circuit board (8), the circuit board (8) is located on the first side of the battery module, and the circuit board (8) is electrically connected to the second terminal (4) and the electrical connector (5) respectively; The processor chip is electrically connected to the circuit board (8).

11. The battery pack according to claim 10, wherein, The processor chip is located in the central area of ​​the circuit board (8).

12. An electrical appliance, wherein, The battery pack includes any one of claims 8-11.

Images