Battery monomer, battery pack with battery monomer and electric equipment

Abstract

The utility model discloses a battery monomer and its battery pack, electric equipment, battery monomer includes: shell, first pole, second pole and electric connecting piece, in the first direction, first pole and second pole are distributed at the both ends of shell, the electric connecting piece is provided in the shell, in the first direction, the second pole is distributed at the both ends of the shell, in the second direction, the electric connecting piece is connected with the first pole and the second pole. The electric connecting piece and the second pole are located at the same end of the shell, and the electric connecting piece and the first pole are electrically connected through an extending piece extending in the shell in the first direction. According to the single battery provided by the embodiment of the utility model, the second pole and the electric connecting piece are arranged at the same end of the shell, so that the voltage of the single battery can be sampled and analyzed from one side, the measurement difficulty is reduced, the signal transmission path is reduced, the resistance partial voltage during the measurement of the voltage of the single battery is further reduced, and the detection error is reduced.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and more specifically, to a battery cell, a battery pack having the same, and an electrical device. Background Art

[0002] In the related art, the positive electrode terminal and the negative electrode terminal of a blade battery are distributed on both sides of the housing. In order to collect the voltage information of multiple blade batteries, two circuit boards and a processor chip need to be provided. The two circuit boards are distributed on both sides of the blade battery and respectively collect the voltage information of the positive and negative electrodes of the battery. When transmitting the signals at the two circuit boards to the processor chip respectively, due to the long distance and the different distances between each blade battery and the processor chip, and the existence of wire resistance and welding resistance on the transmission path, there will be different degrees of resistance voltage division when measuring the voltage, bringing different errors to the measurement of the voltage at both ends of the blade battery and affecting the voltage detection accuracy of the blade battery. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery cell. The second terminal and the electrical connection member of the battery cell are arranged at the same end of the housing, so that the voltage of the battery cell can be sampled and analyzed from one side, reducing the measurement difficulty, shortening the signal transmission path, and thus reducing the resistance voltage division when measuring the voltage of the battery cell and reducing the detection error.

[0004] The utility model also provides a battery pack having the above battery cell.

[0005] The utility model also provides an electrical device having the above battery pack.

[0006] The battery cell according to the first aspect embodiment of the utility model includes: a housing, a first terminal, a second terminal, and an electrical connection member. In a first direction, the first terminal and the second terminal are distributed at both ends of the housing, the electrical connection member is arranged on the housing, and in the first direction, the electrical connection member and the second terminal are located at the same end of the housing, and the electrical connection member and the first terminal are electrically connected by an extension member extending along the first direction in the housing.

[0007] The battery cell according to the embodiment of the utility model arranges the second terminal and the electrical connection member at the same end of the housing, so that the voltage of the battery cell can be sampled and analyzed from one side, reducing the measurement difficulty, shortening the signal transmission path, and thus reducing the resistance voltage division when measuring the voltage of the battery cell and reducing the detection error.

[0008] In addition, the battery cell according to the above embodiment of the utility model may further have the following additional technical features:

[0009] According to some embodiments of the present utility model, the battery cell further includes a guiding member disposed on one side of the battery core of the battery cell. The guiding member is provided with a guiding groove, and at least a part of the extending member is located in the guiding groove.

[0010] According to some alternative embodiments of the present utility model, the extending member is connected to the housing through an insulating adhesive.

[0011] According to some embodiments of the present utility model, the electrical connection member and the second pole are located on the same side wall of the housing in the first direction.

[0012] According to some embodiments of the present utility model, the first pole and the second pole are respectively in insulating cooperation with the housing, and the electrical connection member is disposed on the housing and electrically connected to the housing.

[0013] According to some alternative embodiments of the present utility model, the electrical connection member penetrates through the housing, and the electrical connection member and the housing are electrically connected through a conductive rubber ring.

[0014] According to some specific embodiments of the present utility model, the battery cell further includes a battery core. The second pole is electrically connected to the negative electrode tab of the battery core, and the first pole is electrically connected to the positive electrode tab of the battery core.

[0015] According to a second aspect embodiment of the present utility model, a battery pack is provided, which includes: a box body; a battery module, the battery module includes a plurality of battery cells arranged along a second direction, and the battery cells are the battery cells according to the embodiments of the first aspect of the present utility model; a battery management unit. In the first direction, the battery management unit is located on the first side of the battery module. The battery management unit is at least used to detect the voltage of each battery cell, and the battery management unit is electrically connected to the second poles and the electrical connection members of at least a part of the battery cells, wherein the second direction and the first direction intersect.

[0016] For the battery pack according to the embodiments of the present utility model, by using the battery cells according to the embodiments of the first aspect of the present utility model, and by disposing the second pole and the electrical connection member 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, shortening the signal transmission path, thereby reducing the resistance voltage division during the measurement of the battery cell voltage and reducing the detection error.

[0017] According to some embodiments of the present utility model, a plurality of the battery cells are connected in series. In the second direction, the first poles and the electrical connection members of the plurality of battery cells are alternately arranged.

[0018] According to some embodiments of the present utility model, 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 pole and the electrical connector respectively; and a processor chip electrically connected to the circuit board.

[0019] According to some alternative embodiments of the present utility model, the processor chip is located in a central region of the circuit board.

[0020] According to an embodiment of the third aspect of the present utility model, an electrical device is provided, which includes the battery pack according to the embodiment of the second aspect of the present utility model.

[0021] For the electrical device according to the embodiment of the present utility model, by using the battery pack according to the embodiment of the second aspect of the present utility model, and by arranging the second pole and the electrical connector at the same end of the housing, it is possible to sample and analyze the voltage of the battery cell from one side, reducing the measurement difficulty, shortening the signal transmission path, thereby reducing the resistance voltage division during the measurement of the battery cell voltage and reducing the detection error.

[0022] The additional aspects and advantages of the present utility model will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0024] Figure 1 is a schematic structural diagram of a battery module and a battery management unit according to an embodiment of the present utility model;

[0025] Figure 2 is an exploded view of a battery cell according to an embodiment of the present utility model;

[0026] Figure 3 is a schematic diagram of the cooperation between the electrical connector and the housing.

[0027] Reference numerals: 100, battery cell; 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; 52, lead-out piece; 6, extension piece; 61, first connection portion; 62, extension portion; 63, second connection portion; 7, guiding piece; 71, guiding groove; 8, circuit board; 9, positive and negative connection piece; 95, fixing disc; 96, insulating ceramic ring. Detailed 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 like or similar reference numerals denote like or similar elements or elements having like 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 a limitation to the present utility model.

[0029] The battery cell 100 according to an embodiment of the present utility model will be described below with reference to the accompanying drawings.

[0030] As Figures 1 - 3 shown, the battery cell 100 according to an embodiment of the present utility model includes a housing, a first terminal 3, a second terminal 5, and an electrical connection member 5.

[0031] In a first direction, the first terminal 3 and the second terminal 4 are distributed at both ends of the housing.

[0032] The electrical connection member 5 is provided in the housing. In the first direction, the electrical connection member 5 and the second terminal 4 are located at the same end of the housing, and the electrical connection member 5 and the first terminal 3 are electrically connected by an extension member 6 extending in the first direction within the housing.

[0033] In the above technical solution, the electrical connection member 5 does not need to directly contact the first terminal 3, but uses the extension member 6 to achieve the electrical connection between the first terminal 3 and the electrical connection member 5, thus simplifying the structure of the electrical connection member 5 and reducing the cost of the battery cell 100.

[0034] The second terminal 4 and the electrical connection member 5 of the battery cell 100 are located at the same end of the housing, which is convenient for measuring the voltage of each battery cell 100 from one side of the battery cell 100.

[0035] Specifically, since the electrical connection member 5 and the first terminal 3 are electrically connected by the extension member 6, the electric potential at the electrical connection member 5 is the same as that of the first terminal 3. Therefore, the voltage of the battery cell 100 can be obtained by measuring the electrical connection member 5 and the second terminal 4.

[0036] Among them, in the prior art, it is necessary to measure the voltage of the battery cell from both sides of the battery cell through the first terminal and the second terminal. However, in this application, by arranging the second terminal 4 and the electrical connection member 5 at the same end, the voltage of the battery cell 100 can be measured from one side of the battery cell 100, reducing the measurement difficulty.

[0037] Therefore, for the battery cell 100 according to an embodiment of the present utility model, by arranging the second terminal 4 and the electrical connection member 5 at the same end of the housing, the voltage of the battery cell 100 can be sampled and analyzed from one side, reducing the measurement difficulty, shortening the signal transmission path, and further reducing the resistance voltage division when measuring the voltage of the battery cell 100 and reducing the detection error.

[0038] The battery cell 100 according to specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0039] In some specific embodiments of the present invention, as Figures 1 - 3 shown, the battery cell 100 includes a housing, a first pole column 3, a second pole column 5, and an electrical connector 5.

[0040] In some embodiments of the present invention, as Figure 2 shown, the battery cell 100 further includes a guiding member 7. The guiding member 7 is disposed on one side of the battery core 2 of the battery cell 100. The guiding member 7 is provided with a guiding groove 71, and at least a part of the extending member 6 is located in the guiding groove 71.

[0041] In the above technical solution, by placing a part of the extending member 6 in the guiding groove 71, the extending portion 62 is protected by the guiding member 7, 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.

[0042] In some embodiments, the length direction of the guiding groove 71 extends along a first direction. The depth of the guiding groove 71 is 1 mm, the width of the guiding groove 71 is 5 mm, and the size of the extending portion 62 is adapted to the size of the guiding groove 71. Specifically, the depth of the extending portion 62 is 1 mm, and the width of the extending portion 62 is 5 mm, so that the extending portion 62 fits against the inner wall of the guiding groove 71 to embed the extending portion 62 into the guiding groove 71.

[0043] In some embodiments, the extending member 6 is configured as a conductive aluminum foil.

[0044] The structure of the extending member 6 in the embodiments of the present invention is simple, reducing the cost of the battery cell 100, and the conductive aluminum foil is light in weight, which is beneficial to the light weight of the battery cell 100.

[0045] In some alternative embodiments of the present invention, the extending member 6 is connected to the housing through an insulating adhesive to fix the extending member 6 in the housing. Among them, the insulating adhesive can be insulating blue glue.

[0046] 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.

[0047] In some embodiments of the present invention, the electrical connector 5 and the second pole column 4 are located on the same side wall of the housing in the first direction, so as to facilitate detecting and analyzing the voltage of the battery cell 100 through the electrical connector 5 and the second pole column 4 from this side wall.

[0048] In some embodiments, the first terminal 3 and the second terminal 4 are located on two opposite side walls of the housing in the first direction, and the second terminal 4 and the electrical connection member 5 are located on the same side wall.

[0049] In some alternative embodiments of the present utility model, the electrical connection members 5 are arranged at intervals from the second terminals 4, and the electrical connection members 5 are arranged adjacent to the end of the housing, so as to reserve a connection space for the electrical connection members 5.

[0050] Among them, arranging the electrical connection members 5 adjacent to the end of the housing facilitates reserving an installation space for the electrical connection members 5, thereby avoiding the electrical connection members 5 being too close to the second terminals 4 and preventing electrical connection between the electrical connection members 5 and the second terminals 4. At the same time, it is convenient to install the electrical connection members 5 and the second terminals 4, which is conducive to reducing the installation difficulty.

[0051] In some embodiments, the battery module includes a plurality of battery cells 100 arranged in the second direction, and the battery management unit is arranged on one side of the battery module in the first direction for detecting and analyzing the voltage of the battery cells 100. When a plurality of battery cells 100 are connected in series, the electrical connection members 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 electrical connection between the battery management unit and the electrical connection members 5 and the second terminals 4 of some battery cells 100, and further facilitates the battery management unit to measure the voltage of each battery cell 100.

[0052] In some embodiments, as Figure 1 shown, the electrical connection members 5 and the second terminals 4 of the battery cells 100 are arranged at intervals, and the electrical connection members 5 are electrically connected to the battery management unit through the lead-out pieces 52. The battery management unit is directly connected to the second terminals 4. In this way, there is no need for the battery management unit to cover the gap between the second terminals 4 and the electrical connection members 5, which is conducive to reducing the size of the battery management unit.

[0053] In some embodiments, the lead-out pieces 52 are nickel pieces.

[0054] In some embodiments, when a plurality of battery cells 100 are connected in parallel, the electrical connection members 5 and the second terminals 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 electrical connection between the battery management unit and the electrical connection members 5 and the second terminals 4 of the battery cells 100, and further facilitates the battery management unit to measure the voltage of each battery cell 100.

[0055] In some embodiments of the present utility model, the first terminal 3 and the second terminal 4 are respectively in insulating cooperation with the housing, and the electrical connection member 5 is arranged on the housing and electrically connected to the housing.

[0056] Among them, the electrical connector 5 is electrically connected to the first pole 3 through an extension member 6 extending in the first direction within 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 electric potential as the first pole 3, thereby reducing the risk of corrosion of the housing.

[0057] It should be noted that the first pole 3 can be a positive pole or a negative pole. For example, in some embodiments, the housing 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 is electrically connected to the positive pole through the electrical connector 5, and the electric potential of the housing is the same as that of the positive pole, reducing the risk of corrosion of the aluminum housing; in other embodiments, the housing is a steel structural member, the first pole 3 is a negative pole, and the second pole 4 is a positive pole. At this time, the housing is electrically connected to the negative pole through the electrical connector 5, and the electric potential of the housing is the same as that of the negative pole, reducing the risk of corrosion of the steel housing.

[0058] In addition, electrically connecting the electrical connector 5 to the housing can also achieve stable electrification of the housing.

[0059] Specifically, the electrical connector 5 is indirectly connected to the first pole 3 through the extension member 6, reducing the influence of temperature change of the first pole 3 on the electrical connector 5, and further improving the safety of the battery cell 100.

[0060] Specifically, when the battery cell 100 is working, 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, because the first pole 3 and the second pole 4 are both insulated from the housing, the temperature rise of the first pole 3 and the second pole 4 does not affect the electrification of the housing; 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 housing and the first pole 3, enabling the housing to be stably electrified and improving the safety of the battery cell 100.

[0061] In some embodiments of the present invention, the electrical connector 5 passes through the housing, and the electrical connector 5 and the housing are electrically connected through a conductive rubber ring 51. The conductive rubber ring 51 not only plays a role in sealing the housing 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.

[0062] In some specific embodiments, the base material of the conductive rubber ring 51 can be materials such as fluororubber, ethylene propylene diene monomer, silicone rubber, fluorosilicone rubber, etc. And conductive materials such as carbon black, graphite, metal nanoparticles, etc. 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 10 5 Ω to 10 6 Ω.

[0063] When the first terminal 3 is connected to the positive electrode tab of the battery cell 2, when the electrical connector 5 is positively charged, the electric potential of the housing is 60% - 100% of the electric potential at the first terminal 3.

[0064] In the embodiment of the present utility model, a certain resistance is set between the housing and the electrical connector 5 through the conductive rubber ring 51, avoiding the potential safety hazard caused by the huge short-circuit current generated when the housing conducts the positive and negative terminal posts in case of faults such as short circuit and needle puncture, greatly reducing the short-circuit current and leakage current levels, avoiding the occurrence of short-circuit arcing, and improving the safety of the battery cell 100.

[0065] In some specific embodiments of the present utility model, the housing includes: a main body 11 and two cover plates. The main body 11 is integrally in a cuboid shape, openings are provided at both ends of the main body 11, the two cover plates are respectively arranged at both ends of the main body 11, the cover plates close the openings at the corresponding ends of the main body 11, and a receiving space for placing the battery cell 2 is defined between the main body 11 and the two cover plates. The two cover plates are respectively formed as a first side wall 12 and a second side wall 13 arranged oppositely along the first direction.

[0066] The housing structure in the embodiment of the present utility model is simple, reducing the cost of the battery cell 100.

[0067] In some specific embodiments, the first side wall 12 is provided with a first through hole, the first terminal 3 passes through the first through hole, so that at least part of the first terminal 3 is located outside the housing, facilitating the connection of the first terminal 3 to the external structure; the second side wall 13 is provided with a second through hole, the second terminal 4 passes through the second through hole, so that at least part of the second terminal 4 is located outside the housing, facilitating the connection of the second terminal 4 to the external structure. To ensure the sealing performance of the housing, a first sealing member is sleeved outside the first terminal 3, the first sealing member seals the first through hole, a second sealing member is sleeved outside the second terminal 4, the second sealing member seals the second through hole, and both the first sealing member and the second sealing member are insulating material members, so that the first terminal 3 and the second terminal 4 are respectively in insulating cooperation with the housing.

[0068] Refer to Figure 2 and Figure 3 Also, the second side wall 13 is provided with a third through hole 131, 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, facilitating the connection of the electrical connector 5 to the external structure. The electrical connector 5 and the second side wall 13 are electrically connected through the conductive rubber ring 51, and the conductive rubber ring 51 is sleeved outside the electrical connector 5 and seals the third through hole 131.

[0069] 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 manner of the electrical connector 5 with the housing is also the same as that of the first pole 3 and the second pole 4 with the housing 1.

[0070] 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.

[0071] In some examples, the structure of the electrical connector 5 is that the first pole 3 is reduced proportionally to 0.3 - 0.5 times.

[0072] Since the electrical connector 5 is only used for voltage detection and does not need to pass current, in the embodiments of the present invention, by reducing the size of the electrical connector 5, the cost of the battery cell 100 is reduced.

[0073] In some alternative embodiments of the present invention, the battery cell 100 further includes an electrode core 2. The second pole 4 is electrically connected to the negative electrode tab of the electrode core 2, and the first pole 3 is electrically connected to the positive electrode tab of the electrode core 2, so that the electrical connector 5 is positively charged, and then the housing is positively charged, reducing the activity degree of the housing, and further reducing the probability of corrosion of the housing.

[0074] In some embodiments, the electrical connector 5 and the first pole 3 are located on the opposite side walls of the housing in the first direction, and the extension member 6 extends along the first direction to connect the electrical connector 5 and the first pole 3.

[0075] In some embodiments, as Figure 2 shown, 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 electrode core 2 of the battery cell 100, the first connection portion 61 and the second connection portion 63 are respectively located at both ends of the electrode core 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.

[0076] 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.

[0077] In the embodiments of the present invention, the structure of the extension member 6 is simple, reducing the cost of the battery cell 100.

[0078] In some examples, the first pole column 3 is connected to the tab of the battery cell 2 through a first electrical connection piece. The first connection part 61 can be electrically connected to the tab, or can be electrically connected to the first electrical connection piece or the first pole column 3. There are no excessive restrictions here.

[0079] In some specific embodiments, the first connection part 61 is formed into a strip-shaped structure. The first connection part 61 is located between the tab of the battery cell 2 and the first electrical connection piece of the first pole column 3, and the tab of the battery cell 2, the first connection part 61, and the first electrical connection piece of the first pole column 3 are fixedly connected by laser welding to achieve conduction.

[0080] In some examples, the length of the first connection part 61 is 4 cm, and the width of the first connection part 61 is 2 cm.

[0081] In the embodiment of the present utility model, the first connection part 61 is connected to the first pole column 3 by welding, which improves the reliability of the electrical connection between the first connection part 61 and the first pole column 3.

[0082] In some specific embodiments, the second connection part 63 is formed into a circular shape. The diameter of the second connection part 63 is smaller than the diameter of the electrical connector 5. The second connection part 63 is fixedly connected to the electrical connector 5 by laser welding to achieve conduction.

[0083] In the embodiment of the present utility model, the second connection part 63 is connected to the electrical connector 5 by welding, which improves the reliability of the electrical connection between the second connection part 63 and the electrical connector 5.

[0084] The following refers to the attached Figure 2 、 Figure 3 to describe a specific embodiment of the present utility model.

[0085] The battery cell 100 according to the embodiment of the present utility model includes: a housing, a battery cell 2, a first pole column 3, and a second pole column 4. The battery cell 2 is disposed in the housing. Both the first pole column 3 and the second pole column 4 are electrically connected to the battery cell 2. The first pole column 3 and the second pole column 4 are respectively in insulating cooperation with the housing.

[0086] The battery cell 100 further includes an electrical connector 5. The electrical connector 5 is disposed in the housing and is electrically connected to the housing. The electrical connector 5 is electrically connected to the first pole column 3.

[0087] The housing is an aluminum structural member. The first pole column 3 is a positive pole column, and the second pole column 4 is a negative pole column. At this time, the housing is electrically connected to the positive pole column through the electrical connector 5, and the potentials of the housing and the positive pole column are the same.

[0088] The electrical connector 5 penetrates the housing, and the electrical connector 5 and the second pole column 4 are located on the same side wall of the housing.

[0089] The housing includes a first side wall 12 and a second side wall 13. The first side wall 12 and the second side wall 13 are disposed at two ends of the housing 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.

[0090] The housing further includes a main body 11 and two cover plates. The main body 11 is generally in the shape of a rectangular parallelepiped. Openings are provided at both ends of the main body 11. The two cover plates are respectively disposed at the two ends of the main body 11. 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. The two cover plates respectively form the above-mentioned first side wall 12 and second side wall 13.

[0091] The first side wall 12 is provided with a first through hole. 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, facilitating the connection of the first pole 3 to an external structure. The housing is further provided with a second through hole. 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, facilitating the connection of the second pole 4 to an external structure. To ensure the sealing performance of the housing, 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 materials, so that the first pole 3 and the second pole 4 are respectively insulated from the housing.

[0092] The second side wall 13 is further provided with a third through hole 131. 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, 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 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.

[0093] The size of the electrical connector 5 is reduced to 0.3 times that of the first pole 3 in equal proportion.

[0094] The electrical connector 5 is electrically connected to the first pole 3 through an extension member 6 extending inside the housing.

[0095] The extension member 6 includes a first connecting portion 61, an extension portion 62, and a second connecting portion 63. Among them, the extension portion 62 is located on one side of the battery cell 2. The first connecting portion 61 and the second connecting portion 63 are respectively located at both ends of the battery cell 2. The first connecting portion 61 is connected to the first pole 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.

[0096] The first connecting part 61 is formed into a strip-shaped structure. The first connecting part 61 is located between the tab of the battery cell 2 and the first electrical connecting piece of the first pole column 3, and the tab of the battery cell 2, the first connecting part 61 and the first electrical connecting piece of the first pole column 3 are fixedly connected by laser welding to achieve conduction.

[0097] The second connecting part 63 is formed into a circular shape. The diameter of the second connecting part 63 is smaller than the diameter of the electrical connecting piece 5. The second connecting part 63 is fixedly connected to the electrical connecting piece 5 by laser welding to achieve conduction.

[0098] The battery cell unit 100 further includes: a guiding member 7. The guiding member 7 is provided on one side of the battery cell 2. The guiding member 7 is provided with a guiding groove 71, and the extending part 62 of the extending member 6 is located in the guiding groove 71.

[0099] The extending member 6 is constructed as a conductive aluminum foil, and the extending part 62 of the extending member 6 is connected to the housing by insulating blue glue.

[0100] The battery pack according to an embodiment of the present invention will be described below. The battery pack according to an embodiment of the present invention includes a box body, a battery module and a battery management unit.

[0101] The battery module includes a plurality of battery cell units 100 according to the above embodiments of the present invention. The plurality of battery cell units 100 are arranged in a stacking direction. The battery module is disposed in the box body to use the box body to separate the battery module from the external environment, thereby providing protection for the battery module, reducing the influence of the outside on the battery module, and facilitating the stable operation of the battery module.

[0102] In the first direction, the battery management unit is located on the first side of the battery module. The battery management unit is at least used to detect the voltage of each battery cell unit 100. The battery management unit is electrically connected to the second pole columns 4 and the electrical connecting pieces 5 of at least a part of the battery cell units 100. Since the electrical connecting piece 5 is electrically connected to the first pole column 3, by measuring the potential between the second pole column 4 and the electrical connecting piece 5, the potential between the first pole column 3 and the second pole column 4 can be obtained, thereby realizing the measurement of the voltage of the battery cell unit 100 from one side.

[0103] It should be explained here that the electrical connection between the second pole column 4 and the battery management unit can be a direct connection or an electrical connection through a conductive member such as a wire; the electrical connection between the electrical connecting piece 5 and the battery management unit can be a direct connection or an electrical connection through a conductive member such as a wire, and no excessive restrictions are made here.

[0104] Among them, the battery management unit is disposed on the same side of the plurality of battery cell units 100 to measure the voltage of each battery cell unit 100. On the one hand, this facilitates reducing the installation steps, reducing the space reserved for installation, and reducing the use of flexible circuit boards on the other side. On the other hand, it is convenient to reduce the detection error of the battery management unit.

[0105] Specifically, due to the characteristics of the structure of the battery cell itself in the related art, the positive electrode terminal and the negative electrode terminal are distributed on both sides of the housing. In order 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 distributed on both sides of the battery cell and are respectively electrically connected to the positive electrode terminal and the negative electrode terminal. When transmitting the signals at the two circuit boards to the processor chip respectively, the signals are transmitted to the processor chip from different sides, resulting in a relatively long signal transmission path, and the distance between each battery cell and the processor chip is different. There are wire resistance and welding resistance on the transmission path, and there will be different degrees of resistance voltage division when measuring the voltage, bringing different errors to the measurement of the voltage at both ends of the battery cell, and it is impossible to perform unified calibration through algorithms.

[0106] In the present utility model, the battery management unit is arranged on the first side of the battery module, and the battery management unit is used to sample and analyze the voltage of at least each battery cell 100 from one side, reducing the signal transmission path, thereby reducing the resistance voltage division when measuring the voltage of the battery cell 100 and reducing the detection error of the battery management unit.

[0107] In addition, 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 member 6. In this way, the voltage error generated by the extension member 6 can be compensated for the error through a unified algorithm, thereby facilitating the improvement of the detection accuracy of the battery management unit.

[0108] According to the battery pack of the embodiment of the present utility model, by using the battery cell 100 according to the above embodiment of the present utility model, the battery management unit is arranged on the first side of the battery module, and the battery management unit is used to sample and analyze the voltage of at least each battery cell 100 from one side, canceling the flexible circuit board for sampling on the other side, reducing the signal transmission path, thereby reducing the resistance voltage division when measuring the voltage of the battery cell 100 and reducing the detection error of the battery management unit.

[0109] In some embodiments of the present utility model, as Figure 1 shown, a plurality of battery cells 100 are connected in series. In the second direction, the first terminals 3 of the plurality of battery cells 100 and the electrical connectors 5 are alternately arranged to facilitate sampling and analyzing the voltage of each battery cell 100 from one side of the battery module.

[0110] Specifically, the first terminals 3 of the battery cells 100 and the electrical connectors 5 are alternately arranged to facilitate the electrical connection between the battery management unit and the electrical connectors 5, and then the battery management unit is used to sample and analyze the voltage of each battery cell 100.

[0111] For example, in a first direction, the battery module includes a first side and a second side. The battery module includes a plurality of battery cells 100 such as a first battery cell, a second battery cell, and a third battery cell arranged in a second direction. The electrical connection member 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 connection member 5 and the second terminal 4 of the second battery cell are located on the second side of the battery module. The electrical connection member 5 and the second terminal 4 of the third battery cell are located on the first side of the battery module.

[0112] The battery management unit is located on the first side of the battery module and is electrically connected to the electrical connection member 5 and the second terminal 4 located on the first side, that is, the battery management unit is electrically connected to the electrical connection member 5 and the second terminal 4 of the first battery cell, and the battery management unit is electrically connected to the electrical connection member 5 and the second terminal 4 of the third battery cell.

[0113] For the second battery cell, since the plurality of 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 electric potential at the second terminal 4 of the second battery cell is the same as the electric 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 connection member 5 of the first battery cell, that is, the electric potential at the second terminal 4 of the second battery cell is the same as the electric potential at the electrical connection member 5 of the first battery cell.

[0114] 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 electric potential at the second battery cell through the second terminal 4 of the third battery cell and the electrical connection member 5 of the first battery cell. Furthermore, the battery management unit can measure the voltage of each battery cell 100 in the battery module from one side of the battery module.

[0115] For the sake of convenience of description, the plurality of battery cells 100 in the battery module are divided into odd-numbered battery cells and even-numbered battery cells here. The above-mentioned first battery cell and the above-mentioned third battery cell are odd-numbered battery cells, and the above-mentioned second battery cell is an even-numbered battery cell. Among them, the odd-numbered battery cells and the even-numbered battery cells are arranged alternately in the second direction.

[0116] The electrical connection members 5 of the odd-numbered battery cells and the first terminals 3 of the even-numbered battery cells are arranged alternately in the second direction. The battery management unit is electrically connected to the electrical connection members 5 and the second terminals 4 of the odd-numbered battery cells to be able to directly measure the voltage of the odd-numbered battery cells. For the even-numbered battery cells, the voltage of the even-numbered battery cell can be measured by measuring the electrical connection member 5 of one of the two adjacent odd-numbered battery cells and the second terminal 4 of the other.

[0117] In some embodiments, such as Figure 1As shown, the second pole post 4 of the single battery cell and the electrical connection member 5 are both located on the first side of the battery module, which facilitates the electrical connection between the battery management unit and the second pole post 4 of the single battery cell and the electrical connection member 5, thereby facilitating the reduction of the current transmission path, reducing the loss of current during transmission, and further reducing the detection error of the battery management unit.

[0118] In some examples, such as Figure 1 As shown, the battery cell 100 further includes a plurality of positive and negative connection pieces 9. A part of the positive and negative connection pieces 9 are located on the first side of the battery module and arranged along the second direction, and another part of the positive and negative connection pieces 9 are located on the second side of the battery module and arranged along the second direction, so as to connect a plurality of battery cells 100 in series by using the plurality of positive and negative connection pieces 9, thereby forming a battery module.

[0119] In other embodiments of the present invention, a plurality of battery cells 100 are connected in parallel, and the electrical connection member 5 of each battery cell 100 is located on the first side of the battery module, which facilitates the electrical connection between the battery management unit and the electrical connection member 5 located on the first side, and further facilitates the battery management unit to measure the voltage of each battery cell 100.

[0120] In some embodiments of the present invention, such as Figure 1 As shown, 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 pole post 4 and the electrical connection member 5 respectively. The processor chip is electrically connected to the circuit board 8. The processor chip obtains the potential signals at the second pole post 4 and the electrical connection member 5 through the circuit board 8, and then analyzes to obtain the voltage between the second pole post 4 and the electrical connection member 5, and obtains the voltage of the corresponding battery cell 100.

[0121] In some embodiments, the battery management unit includes a single circuit board 8. By using a single circuit board 8, the voltage of each battery cell 100 in the battery module can be measured. Compared with the prior art where a circuit board 8 needs to be provided on each side of the battery cell 100, the present invention facilitates the reduction of the number of circuit boards 8, and further reduces the cost of the battery pack.

[0122] In some embodiments, the circuit board 8 is the circuit board 8.

[0123] In some alternative embodiments of the present invention, the processor chip is located in the central area of the circuit board 8, which facilitates the balance of the paths transmitted from different battery cells 100 to the processor chip, and further facilitates the reduction of the error when the battery management unit measures the voltage of the battery cell 100.

[0124] For example, the battery module includes five battery cells 100 arranged in the second direction. 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 distances between the first and fifth battery cells 100 and the processor chip are the same, and the distances between the second and fourth battery cells 100 and the processor chip are the same.

[0125] When the battery module includes six battery cells 100 arranged in 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 distances between the first and sixth battery cells 100 and the processor chip are the same, the distances between the second and fifth battery cells 100 and the processor chip are the same, and the distances between the third and fourth battery cells 100 and the processor chip are the same.

[0126] The following refers to the attached Figures 1 - 3 to describe a specific embodiment of the present invention.

[0127] The battery cell 100 includes a plurality of battery cells 100 and a plurality of positive and negative connection pieces 9. A part of the positive and negative connection pieces 9 is located on the first side of the battery module and arranged in the second direction, and another part of the positive and negative connection pieces 9 is located on the second side of the battery module and arranged in the second direction, so as to connect a plurality of battery cells 100 in series by using a plurality of positive and negative connection pieces 9, thereby forming a battery module.

[0128] 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, a plurality of 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 alternately arranged in the second direction.

[0129] The second side wall 13 of the odd-numbered battery cell is located on the first side, the first side wall 12 of the even-numbered battery cell is located on the second side, and the electrical connector 5 and the second pole 4 are located on the second side wall 13. Therefore, the circuit board 8 is electrically connected to the electrical connector 5 and the second pole 4 of the odd-numbered battery cell to be able to directly measure the voltage of the odd-numbered battery cell. For the even-numbered battery cell, since a plurality of 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 pole 4 of the other.

[0130] 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 at 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 pole 4 and the electrical connector 5, the transmission path of the electrical signal is reduced, thereby reducing the resistive voltage division during the measurement of the voltage of the battery cell 100 and reducing the detection error of the battery management unit.

[0131] In addition, the signal at one end of each battery cell 100 is transmitted to the circuit board 8 through the extension member 6. The voltage error generated by the extension member 6 can be compensated for the error through a unified algorithm, thereby facilitating the improvement of the detection accuracy of the battery management unit.

[0132] In summary, the battery management unit only needs to be arranged on the first side of the plurality of battery cells 100 to sample and analyze the voltages of the plurality of battery cells 100, realizing the measurement of the voltages of the plurality of batteries from one side. Thereby, the transmission path of the electrical signal is reduced, the resistive voltage division during the measurement of the voltage of the battery cell 100 is reduced, and the detection error of the battery management unit is reduced.

[0133] The other configurations and operations of the battery pack according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0134] The electrical device according to the embodiment of the present invention will be described below. The electrical device according to the embodiment of the present invention includes the battery pack according to the above embodiment of the present invention. The electrical device can be a vehicle, a power bank, or other devices, and the present invention does not limit this.

[0135] For the electrical device according to the embodiment of the present invention, by using the battery pack according to the above embodiment of the present invention, the battery management unit is arranged on the first side of the battery module, and the battery management unit samples and analyzes the voltage of at least each battery cell 100 from one side, reducing the transmission path of the signal, thereby reducing the resistive voltage division during the measurement of the voltage of the battery cell 100 and reducing the detection error of the battery management unit.

[0136] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "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, the 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. In the description of the present utility model, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween.

[0137] In the description of the present utility model, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature.

[0138] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, 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 a direct connection or an indirect connection 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 situations.

[0139] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means 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 descriptions 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.

[0140] Although embodiments of the present invention 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 invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell (100), characterized in that: include: A shell, a first pole (3), a second pole (4) and an electrical connector (5), wherein in a first direction, the first pole (3) and the second pole (4) are distributed at two ends of the shell, The electrical connector (5) is arranged on the shell; in the first direction, the electrical connector (5) and the second pole (4) are located at the same end of the shell; the electrical connector (5) and the first pole (3) are electrically connected via an extension piece (6) extending in the shell along the first direction.

2. The battery cell (100) according to claim 1, characterized in that: The battery cell (100) further comprises a guide member (7), the guide member (7) being arranged on one side of the battery core (2) of the battery cell (100), the guide member (7) being provided with a guide groove (71), and at least a portion of the extension member (6) being located in the guide groove (71).

3. The battery cell (100) according to claim 2, characterized in that: The extension piece (6) is connected to the shell via an insulating adhesive piece.

4. The battery cell (100) according to claim 1, characterized in that: 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 claim 1, characterized in that: The first pole (3) and the second pole (4) are respectively insulated and matched with the shell, and the electrical connector (5) is arranged on the shell and electrically connected to the shell.

6. The battery cell (100) according to claim 5, characterized in that: The electrical connector (5) is inserted into the housing, and the electrical connector (5) and the housing are electrically connected via a conductive rubber ring (51).

7. The battery cell (100) according to claim 6, characterized in that: The battery cell (100) further comprises a battery cell (2), the second pole (4) being electrically connected to the negative pole tab of the battery cell (2), and the first pole (3) being electrically connected to the positive pole tab of the battery cell (2).

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

9. The battery pack according to claim 8, characterized in that: A plurality of battery cells (100) are connected in series, and in the second direction, the first poles (3) and the electrical connectors (5) of the plurality of battery cells (100) are arranged alternately.

10. The battery pack according to claim 8, characterized in that: The battery management unit comprises: A circuit board (8), the circuit board (8) being located on the first side of the battery module, the circuit board (8) being electrically connected to the second pole (4) and the electrical connector (5) respectively; A processor chip, wherein the processor chip is electrically connected to the circuit board (8).

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

12. An electrical device, characterized in that: A battery pack comprising any one of claims 8-11.

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