Battery cell and battery pack

Abstract

The invention discloses a single battery and a battery pack, the single battery comprises a positive pole piece, a negative pole piece, an electrolyte, a positive pole lug and a negative pole lug, the electrolyte is arranged between the negative pole piece and the positive pole piece, the positive pole lug is electrically connected with the positive pole piece, the negative pole lug is electrically connected with the negative pole piece, and the negative pole piece is electrically connected with the negative pole piece. The two ends of the single battery along the first direction are respectively a first end face and a second end face, one of the positive pole lug and the negative pole lug is arranged on the first end face, and the other one is arranged on the second end face; in the second direction, the ratio of the width of the positive pole lug to the width of the single battery is greater than or equal to 0.5, and / or, in the second direction, the ratio of the width of the negative pole lug to the width of the single battery is greater than or equal to 0.5; the second direction is perpendicular to the first direction. The battery pack includes a plurality of battery cells. The width of the tab is set to be proportional to the width of the battery monomer, so that the charging and discharging performance of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to a battery, and more particularly to a battery cell and a battery pack. Background Art

[0002] A battery in the related art generally includes a battery cell, a tab and an aluminum-plastic film. The positive and negative tabs are located on the pole pieces at both ends of the battery cell, and the aluminum-plastic film wraps the positive and negative tabs to protect the battery cell. The main function of the tab is to act as a channel for current transmission inside the battery. It connects the battery pole piece with the external circuit, allowing current to flow between the inside and outside of the battery.

[0003] The size of the tabs affects the discharge rate of lithium-ion batteries. As the thickness of the battery increases, the length of the positive and negative electrodes of the battery increases. If a single size of tab is used, the discharge capacity of the battery will be restricted.

[0004] This section provides background information related to the present application which is not necessarily prior art. Summary of the invention

[0005] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a battery cell and a battery pack.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions: A battery cell comprises a positive electrode sheet, a negative electrode sheet, an electrolyte, a positive electrode tab and a negative electrode tab, wherein the electrolyte is arranged between the negative electrode sheet and the positive electrode sheet, and the positive electrode tab is electrically connected to the positive electrode sheet; the negative electrode tab is electrically connected to the negative electrode sheet; the two ends of the battery cell along a first direction are respectively a first end face and a second end face, one of the positive electrode tab and the negative electrode tab is arranged on the first end face, and the other is arranged on the second end face; in the second direction, the ratio of the width of the positive electrode tab to the width of the battery cell is greater than or equal to 0.5, and / or, in the second direction, the ratio of the width of the negative electrode tab to the width of the battery cell is greater than or equal to 0.5; the second direction is perpendicular to the first direction.

[0007] In some embodiments, in the second direction, the width of the positive electrode tab is 10 mm to 20 mm, and / or, in the second direction, the width of the negative electrode tab is 10 mm to 20 mm.

[0008] In some embodiments, a ratio of a width of the battery cell in the second direction to a length of the battery cell in the first direction is less than or equal to 0.5.

[0009] In some embodiments, the electrolyte is a liquid electrolyte or a solid electrolyte.

[0010] In some embodiments, the material of the positive electrode sheet includes one or more of NCM, NCA, or LFP.

[0011] In some embodiments, the material of the negative electrode plate includes one or a combination of at least two of graphite, silicon carbon or silicon oxygen, or lithium metal.

[0012] In some embodiments, the voltage of the battery cell is greater than or equal to 2.0V and less than or equal to 5.0V.

[0013] In some embodiments, the current carrying capacity of the positive electrode tab is greater than or equal to 10A, and / or the current carrying capacity of the negative electrode tab is greater than or equal to 10A. A battery pack comprises a shell and a battery pack, wherein the shell can be selectively connected to different power tools and can be supported by the power tools; the battery pack comprises a plurality of battery cells, each of which comprises a positive electrode tab and a negative electrode tab, and the plurality of battery cells are arranged along a third direction; the two ends of the battery cell along a first direction are respectively a first end face and a second end face, one of the positive electrode tab and the negative electrode tab is arranged on the first end face, and the other is arranged on the second end face, and the first direction is perpendicular to the third direction; in the third direction, the distance between the positive electrode tabs of two adjacent battery cells is less than or equal to 20 mm; and / or, in the third direction, the distance between the negative electrode tabs of two adjacent battery cells is less than or equal to 20 mm.

[0014] In some embodiments, the distance between the positive electrode tabs of any two adjacent battery cells is equal; and / or the distance between the negative electrode tabs of any two adjacent battery cells is equal.

[0015] In some embodiments, the battery cells are connected in series and / or in parallel with each other.

[0016] In some embodiments, a ratio of a width of the battery pack along the second direction to a length of the battery pack along the first direction is less than or equal to 0.5, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0017] In some embodiments, the maximum discharge rate of the battery pack is 10C.

[0018] In some embodiments, the output voltage of the battery pack is greater than or equal to 3.6V.

[0019] In some embodiments, when the output voltage of the battery pack is greater than or equal to 3.6V, the discharge rate of the battery pack is greater than or equal to 10C.

[0020] A battery pack comprises a shell and a battery pack, wherein the shell can be selectively connected to different power tools and can be supported by the power tools; the battery pack comprises a plurality of battery cells, each battery cell comprises a positive electrode tab and a negative electrode tab; two ends of the battery cell along a first direction are respectively a first end face and a second end face, and two ends of the battery cell along a second direction are respectively a third end face and a fourth end face, and the second direction is perpendicular to the first direction; the first end faces of at least some of the battery cells are not coplanar, and / or, the third end faces of at least some of the battery cells are not coplanar.

[0021] In some embodiments, on each battery cell, one of the positive electrode tab and the negative electrode tab is located on the first end surface, and the other is located on the second end surface.

[0022] In some embodiments, the battery cells are connected in series and / or in parallel with each other.

[0023] A battery pack comprises a shell, a battery group and a circuit board, wherein the shell can be selectively connected to different electric tools and can be supported by the electric tools; the battery group comprises a plurality of battery cells, each of which has two types of tabs, namely a positive tab and a negative tab; the circuit board is electrically connected to the tabs; the two ends of the battery cell along a first direction are respectively a first end face and a second end face, one of the positive tab and the negative tab is arranged on the first end face, and the other is arranged on the second end face; the circuit board comprises a first circuit board and a second circuit board, the first circuit board is close to the first end face and is electrically connected to the tab on the first end face, and the second circuit board is close to the second end face and is electrically connected to the tab on the second end face.

[0024] In some embodiments, the circuit board has at least one solder groove, the solder groove is connected to the tab, and the number of the solder grooves is less than or equal to the number of the tabs.

[0025] In some embodiments, the battery cells are connected in series and / or in parallel with each other.

[0026] In some embodiments, a ratio of a width of the battery pack along the second direction to a length of the battery pack along the first direction is less than or equal to 0.5, and the second direction is perpendicular to the first direction.

[0027] An electric tool, a tool body and any one of the above-mentioned battery packs, wherein the distance between the positive pole tabs of any two adjacent battery cells in the battery pack is equal; and / or the distance between the negative pole tabs of any two adjacent battery cells in the battery pack is equal.

[0028] The benefit of the present application lies in that by setting the width of the pole ear to be in proportion to the width of the battery cell, as the width of the battery cell increases, the width of the pole ear increases, so that the size of the pole ear is adapted to the size of the battery cell, ensuring sufficient overcharge, reducing the internal resistance of the battery cell, and improving the charge and discharge performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of a battery cell provided in this application; Figure 2 It is a partial structural schematic diagram of a battery cell provided in this application; Figure 3 It is a structural schematic diagram of a battery pack provided by the present application; Figure 4 This is a partial structural diagram of a battery pack provided in this application Figure 1 ; Figure 5 This is a partial structural diagram of a battery pack provided in this application Figure 2 ; Figure 6 is a schematic diagram of the structure of another battery pack provided by the present application; Figure 7 is a schematic diagram of the structure of the riding lawn mower provided by the present application; Figure 8 It is a schematic diagram of the structure of the electric drill provided by the present application; Fig. 9 is a schematic diagram of the structure of the chain saw provided by the present application; Fig.10 It is a structural schematic diagram of the lawn mower provided by the present application; Fig.11 It is a structural schematic diagram of the hair dryer provided in this application. DETAILED DESCRIPTION

[0030] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0031] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0032] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0033] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0034] In this application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, etc. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0035] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0036] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0037] See also Figure 1 and Figure 2The present application provides a battery cell 10, including a positive electrode sheet 11, a negative electrode sheet 12 and an electrolyte 13, wherein the electrolyte 13 is disposed between the negative electrode sheet 12 and the positive electrode sheet 11. The electrolyte 13 may be a transfer medium for lithium ions between the positive electrode sheet 11 and the negative electrode sheet 12 during the charge and discharge process, and may exist in a liquid form or in a solid form. When it exists in a liquid form, it may be called a liquid electrolyte, and when it exists in a solid form, it may be called a solid electrolyte, or an all-solid electrolyte.

[0038] The battery cell 10 further includes a positive electrode tab 14 and a negative electrode tab 15. The positive electrode tab 14 is electrically connected to the positive electrode sheet 11, and the negative electrode tab 15 is electrically connected to the negative electrode sheet 12. The positive electrode tab 14 is used to connect the positive electrode sheet 11 to an external circuit, and the negative electrode tab 15 is used to connect the negative electrode sheet 12 to an external circuit, so that current can flow between the inside and outside of the battery.

[0039] The two ends of the battery cell 10 along the first direction are respectively a first end face 101 and a second end face 102, one of the positive electrode tab 14 and the negative electrode tab 15 is arranged on the first end face 101, and the other is arranged on the second end face 102. Generally, the battery cell 10 is a rectangular bag-shaped structure, and the first end face 101 and the second end face 102 are two opposite end faces of the battery cell 10.

[0040] In this embodiment, the first direction is parallel to the length direction of the battery cell 10. The positive electrode tab 14 is disposed on the first end surface 101, and the negative electrode tab 15 is disposed on the second end surface 102.

[0041] In the second direction, the ratio of the width of the positive electrode tab 14 to the width of the battery cell 10 is greater than or equal to 0.5, or the ratio of the width of the positive electrode tab 14 to the width of the battery cell 10 is greater than or equal to 0.6, or the ratio of the width of the positive electrode tab 14 to the width of the battery cell 10 is greater than or equal to 0.7, or the ratio of the width of the positive electrode tab 14 to the width of the battery cell 10 is greater than or equal to 0.8. Similarly, in the second direction, the ratio of the width of the negative electrode tab 15 to the width of the battery cell 10 is greater than or equal to 0.5, or the ratio of the width of the negative electrode tab 15 to the width of the battery cell 10 is greater than or equal to 0.6, or the ratio of the width of the negative electrode tab 15 to the width of the battery cell 10 is greater than or equal to 0.7, or the ratio of the width of the negative electrode tab 15 to the width of the battery cell 10 is greater than or equal to 0.8. The second direction is perpendicular to the first direction.

[0042] By setting the width of the pole ear to be proportional to the width of the battery cell 10, as the width of the battery cell 10 increases, the width of the pole ear increases, so that the size of the pole ear is adapted to the size of the battery cell 10, ensuring sufficient overcurrent capacity, reducing the internal resistance of the battery cell 10, and improving the charging and discharging performance of the battery cell 10.

[0043] In this embodiment, the second direction is parallel to the width direction of the battery cell 10. Figure 1 and Figure 2 In the figure, O1 represents the first direction and O2 represents the second direction.

[0044] It is understood that the width of the tab does not exceed the width of the battery cell 10. Therefore, in the second direction, the ratio of the width of the positive tab 14 to the width of the battery cell 10 is less than or equal to 1, and the ratio of the width of the negative tab 15 to the width of the battery cell 10 is less than or equal to 1. In some embodiments, the ratio of the width of the positive tab 14 to the width of the battery cell 10 may be 0.5, 0.6, 0.7, 0.8, 0.9 or 1. In some embodiments, the ratio of the width of the negative tab 15 to the width of the battery cell 10 may be 0.5, 0.6, 0.7, 0.8, 0.9 or 1.

[0045] In the second direction, the width of the positive electrode tab 14 is 10 mm to 20 mm, and / or, in the second direction, the width of the negative electrode tab 15 is 10 mm to 20 mm. In some embodiments, the width of the positive electrode tab 14 is 10 mm, 12 mm, 15 mm, 18 mm or 20 mm. In some embodiments, the width of the negative electrode tab 15 is 10 mm, 12 mm, 15 mm, 18 mm or 20 mm. In some embodiments, the width of the positive electrode tab 14 can be equal to the width of the negative electrode tab 15, which is convenient for processing and production.

[0046] The ratio of the width of the battery cell 10 in the second direction to the length of the battery cell 10 in the first direction is less than or equal to 0.5. In some embodiments, the ratio of the width of the battery cell 10 to the length of the battery cell 10 is equal to 0.5, 0.4, 0.3, 0.2 or 0.1.

[0047] The main active material of the positive electrode plate 11 may include at least one of NCM, NCA or LFP. Among them, NCM is the abbreviation of nickel (Ni), cobalt (CO), and manganese (Mn) in the ternary materials of the battery. After the three materials are mixed in a certain proportion and chemical additives are added, an NCM ternary lithium battery is made. NCA refers to the English abbreviation of nickel (NI), cobalt (CO), and aluminum (Al) in the ternary lithium positive electrode material. LFP is the abbreviation of LiFePO4, which is generally called lithium iron phosphate in Chinese. It has an olivine structure. Lithium iron phosphate is a positive electrode material for lithium-ion batteries, also known as lithium iron phosphorus batteries. It is characterized by not containing precious elements such as cobalt and low raw material prices.

[0048] In some embodiments, the main active material of the negative electrode sheet 12 may include one or a combination of at least two of graphite, silicon carbon or silicon oxygen, or lithium metal.

[0049] The voltage of the battery cell 10 is greater than or equal to 2.0 V and less than or equal to 5.0 V. In some embodiments, the voltage of the battery cell 10 may be 2.0 V, 2.5 V, 3.0 V, 3.5 V, 4.0 V, 4.5 V, 5.0 V, or the like.

[0050] In this embodiment, the current carrying value of the positive electrode tab 14 is greater than or equal to 10A, and / or the current carrying value of the negative electrode tab 15 is greater than or equal to 10A. The current carrying value can be understood as the temperature not exceeding the maximum temperature that the battery cell 10 can withstand when the current does not exceed 10A, for example, it can be 100°C.

[0051] By setting the width of the tab to be proportional to the width of the battery cell 10, the charge and discharge performance of the battery cell 10 is improved, so that the battery cell 10 has a larger discharge rate. In some embodiments, the discharge rate of the positive electrode tab 14 is greater than or equal to 10C, and can be 10C, 15C or 20C. In some embodiments, the discharge rate of the negative electrode tab 15 is greater than or equal to 10C, and can be 10C, 15C or 20C. In some embodiments, the discharge rate of the positive electrode tab 14 is equal to the discharge rate of the negative electrode tab 15.

[0052] See also Figures 3 to 7 The present application provides a battery pack 100 including a housing 110 and a battery pack 120 accommodated in the housing 110 . The battery pack 100 also includes a battery pack interface 130 , which can be selectively connected to different power tools 200 and can be supported by the power tools 200 .

[0053] The battery pack 120 includes a plurality of battery cells 10 . The battery cells 10 include a positive electrode tab 14 and a negative electrode tab 15 . The plurality of battery cells 10 are arranged along the third direction.

[0054] As mentioned above, the two ends of the battery cell 10 along the first direction are respectively the first end face 101 and the second end face 102, and one of the positive electrode tab 14 and the negative electrode tab 15 is disposed on the first end face 101 and the other is disposed on the second end face 102. In this embodiment, the first direction is perpendicular to the third direction.

[0055] In this embodiment, the first direction is parallel to the length direction of the battery cell 10. The positive electrode tab 14 is arranged on the first end surface 101, and the negative electrode tab 15 is arranged on the second end surface 102. The second direction is parallel to the width direction of the battery cell 10, and the third direction is parallel to the height direction of the battery cell 10. Therefore, the first direction, the second direction and the third direction are perpendicular to each other. Figure 4 and Figure 5 In the figure, O1 represents the first direction, O2 represents the second direction, and O3 represents the third direction.

[0056] In the third direction, the distance between the positive pole tabs 14 of two adjacent battery cells 10 is less than or equal to 20 mm; and / or, in the third direction, the distance between the negative pole tabs 15 of two adjacent battery cells 10 is less than or equal to 20 mm. The structure is compact, the space occupied is small, and the energy density is high.

[0057] Among them, in the third direction, the distance between the positive pole tabs 14 of two adjacent battery cells 10 refers to the distance from the root of one positive pole tab 14 to the root of the other positive pole tab 14 in the third direction. The root of the positive pole tab 14 is the position where the positive pole tab 14 is connected to the first end face 101. In the third direction, the distance between the negative pole tabs 15 of two adjacent battery cells 10 refers to the distance from the root of one negative pole tab 15 to the root of the other negative pole tab 15 in the third direction. The root of the negative pole tab 15 is the position where the negative pole tab 15 is connected to the second end face 102.

[0058] Alternatively, in the third direction, the distance between the positive electrode tabs 14 of two adjacent battery cells 10 refers to the distance between the two opposite surfaces of the two adjacent positive electrode tabs 14 along the third direction. Figure 6 The distance is represented by L.

[0059] In some embodiments, in the third direction, the distance between the positive pole tabs 14 of two adjacent battery cells 10 is equal to 20 mm, 18 cm, 15 cm, 12 cm or 10 cm. In some embodiments, in the third direction, the distance between the negative pole tabs 15 of two adjacent battery cells 10 is equal to 20 mm, 18 cm, 15 cm, 12 cm or 10 cm. In some embodiments, in the third direction, the distance between the positive pole tabs 14 of two adjacent battery cells 10 is equal to the distance between the negative pole tabs 15 of two adjacent battery cells 10.

[0060] In some embodiments, the distance between the positive electrode tabs 14 of any two adjacent battery cells 10 is equal; and / or the distance between the negative electrode tabs 15 of any two adjacent battery cells 10 is equal, which is convenient for processing, production and assembly.

[0061] The battery cells 10 are connected in series and / or in parallel with each other.

[0062] The ratio of the width of the battery pack 120 along the second direction to the length of the battery pack 120 along the first direction is less than or equal to 0.5, and the first direction, the second direction and the third direction are perpendicular to each other. The structure is compact, occupies a small space, and has a high energy density. In some embodiments, the ratio of the width of the battery pack 120 along the second direction to the length of the battery pack 120 along the first direction is equal to 0.5, 0.4, 0.3, 0.2 or 0.1.

[0063] The maximum discharge rate of the battery pack 100 is 10C, which improves the charge and discharge performance of the battery cell 10.

[0064] The output voltage of the battery pack 100 is greater than or equal to 3.6 V. In some embodiments, the output voltage of the battery pack 100 is greater than or equal to 4.0 V, or greater than or equal to 4.5 V, or greater than or equal to 5.0 V.

[0065] In some embodiments, when the output voltage of the battery pack 100 is greater than or equal to 3.6V, the maximum discharge rate of the battery pack 100 is greater than or equal to 10C.

[0066] In one embodiment, the two ends of the battery cell 10 along the first direction are respectively the first end face 101 and the second end face 102, and the two ends of the battery cell 10 along the second direction are respectively the third end face 103 and the fourth end face 104, and the second direction is perpendicular to the first direction; at least some of the first end faces 101 of the battery cells 10 are not coplanar, and / or at least some of the third end faces 103 of the battery cells 10 are not coplanar. By staggering the arrangement, short circuits are avoided and safety and stability are improved.

[0067] On each battery cell 10, one of the positive electrode tab 14 and the negative electrode tab 15 is located on the first end surface 101, and the other is located on the second end surface 102. In this embodiment, the positive electrode tab 14 is disposed on the first end surface 101, and the negative electrode tab 15 is disposed on the second end surface 102.

[0068] See also Figure 6 The present application also provides a battery pack 100, including the above-mentioned shell 110, the shell 110 can be selectively connected to different power tools and can be supported by the power tools; the battery pack 100 also includes a battery pack 120, the battery pack 120 includes a plurality of battery cells 10, the battery cells 10 have two types of tabs, namely a positive pole tab 14 and a negative pole tab 15; the circuit board is electrically connected to the tabs; the two ends of the battery cell 10 along the first direction are respectively a first end face 101 and a second end face 102, one of the positive pole tab 14 and the negative pole tab 15 is arranged on the first end face 101, and the other is arranged on the second end face 102; the circuit board includes a first circuit board 21 and a second circuit board 22, the first circuit board 21 is close to the first end face 101 and is electrically connected to the tab on the first end face 101, and the second circuit board 22 is close to the second end face 102 and is electrically connected to the tab on the second end face 102.

[0069] In this embodiment, the first direction is parallel to the length direction of the battery cell 10. The positive electrode tab 14 is disposed on the first end surface 101, and the negative electrode tab 15 is disposed on the second end surface 102. Therefore, the first circuit board 21 is electrically connected to the positive electrode tab 14 on the first end surface 101, and the second circuit board 22 is electrically connected to the negative electrode tab 15 on the second end surface 102.

[0070] In some embodiments, the positive electrode tabs 14 of the plurality of battery cells 10 may be directly connected, for example, by welding, and the negative electrode tabs 15 of the plurality of battery cells 10 may also be directly connected, for example, by welding, etc. The welding method may include laser welding, resistance welding, or ultrasonic welding, etc.

[0071] The circuit board has at least one solder groove connected to the tab, and the number of solder grooves is less than or equal to the number of tabs. In some embodiments, the number of solder grooves is equal to the number of tabs, so that the solder grooves are connected to the tabs in a one-to-one correspondence.

[0072] The battery cells 10 are connected in series and / or in parallel with each other.

[0073] The ratio of the width of the battery pack 120 along the second direction to the length of the battery pack 120 along the first direction is less than or equal to 0.5. The first direction is perpendicular to the second direction. In this embodiment, the second direction is parallel to the width direction of the battery cell 10. Figure 6 In the figure, O1 represents the first direction and O2 represents the second direction.

[0074] Multiple battery cells 10 are arranged along the third direction. In the third direction, the distance between the positive pole tabs 14 of two adjacent battery cells 10 is less than or equal to 20 mm; and / or, in the third direction, the distance between the negative pole tabs 15 of two adjacent battery cells 10 is less than or equal to 20 mm. The structure is compact, the space occupied is small, and the energy density is high.

[0075] In this embodiment, the third direction is parallel to the height direction of the battery cell 10, so the first direction, the second direction and the third direction are perpendicular to each other. Figure 6 In the diagram, O3 represents the third direction.

[0076] Among them, in the third direction, the distance between the positive pole tabs 14 of two adjacent battery cells 10 refers to the distance from the root of one positive pole tab 14 to the root of the other positive pole tab 14 in the third direction. The root of the positive pole tab 14 is the position where the positive pole tab 14 is connected to the first end face 101. In the third direction, the distance between the negative pole tabs 15 of two adjacent battery cells 10 refers to the distance from the root of one negative pole tab 15 to the root of the other negative pole tab 15 in the third direction. The root of the negative pole tab 15 is the position where the negative pole tab 15 is connected to the second end face 102.

[0077] Figures 7 to 11 Several common power tools 200 that can be powered by the battery pack 100 are shown, such as a riding lawn mower 200a, an electric drill 200b, a chain saw 200c, a grass trimmer 200d, and a hair dryer 200e. It should be noted that the power tool 200 can also be a handheld power tool, such as a drill, a pruning machine, a sander, etc. Alternatively, the power tool 200 can also be a bench tool, such as a table saw, a miter saw, etc. Alternatively, the power tool 200 can also be a hand-push power tool, such as a hand-push lawn mower, a hand-push snow blower. Alternatively, the power tool 200 can also be a riding power tool, such as a riding lawn mower, a riding vehicle, an all-terrain vehicle, etc. Alternatively, the power tool 200 can also be a robot tool, such as a lawn mowing robot, a snow sweeping robot, etc. In some embodiments, the power tool 200 can be an electric drill, an electric light, an electric car, etc. In some embodiments, the power tool 200 can also be a garden tool, such as a pruning machine, a hair dryer, a lawn mower, a chain saw, etc. Alternatively, the power tool 200 may also be a decoration tool, such as a screwdriver, a nail gun, a circular saw, a sander, etc. In some embodiments, the power tool 200 may also be a vegetation care tool, such as a lawn mower, a lawn mower, a pruner, a chain saw, etc. Alternatively, the power tool 200 may also be a cleaning tool, such as a hair dryer, a snow sweeper, a cleaning machine, etc. Alternatively, the power tool 200 may also be a drill tool, such as a drill, a screwdriver, a wrench, an electric hammer, etc. Alternatively, the power tool 200 may also be a saw tool, such as a reciprocating saw, a jig saw, a circular saw, etc. Alternatively, the power tool 200 may also be a bench tool, such as a bench saw, a miter saw, a metal cutter, a bakelite milling machine, etc. Alternatively, the power tool 200 may also be a grinding tool, such as an angle grinder, a sander, etc. Alternatively, the power tool 200 may also be other tools, such as a lamp, a fan, etc.

[0078] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A battery cell, comprising: Positive electrode; Negative electrode; An electrolyte, disposed between the negative electrode sheet and the positive electrode sheet; A positive electrode tab, electrically connected to the positive electrode sheet; A negative electrode tab, electrically connected to the negative electrode plate; The battery cell is characterized in that two ends of the battery cell along the first direction are respectively a first end surface and a second end surface, one of the positive electrode tab and the negative electrode tab is arranged on the first end surface, and the other is arranged on the second end surface; In the second direction, the ratio of the width of the positive electrode tab to the width of the battery cell is greater than or equal to 0.5, and / or, in the second direction, the ratio of the width of the negative electrode tab to the width of the battery cell is greater than or equal to 0.5; The second direction is perpendicular to the first direction.

2. The battery cell according to claim 1, characterized in that: In the second direction, the width of the positive electrode tab is 10 mm to 20 mm, and / or, in the second direction, the width of the negative electrode tab is 10 mm to 20 mm.

3. The battery cell according to claim 1, characterized in that: A ratio of a width of the battery cell in the second direction to a length of the battery cell in the first direction is less than or equal to 0.

5.

4. The battery cell according to claim 1, characterized in that: The electrolyte is a liquid electrolyte or a solid electrolyte.

5. The battery cell according to claim 1, characterized in that: The material of the positive electrode plate includes one or more of NCM, NCA or LFP.

6. The battery cell according to claim 1, characterized in that: The material of the negative electrode plate includes one or a combination of at least two of graphite, silicon carbon or silicon oxygen or lithium metal.

7. The battery cell according to claim 1, characterized in that: The voltage of the battery cell is greater than or equal to 2.0V and less than or equal to 5.0V.

8. The battery cell according to claim 1, characterized in that: The current carrying capacity of the positive electrode tab is greater than or equal to 10A, and / or the current carrying capacity of the negative electrode tab is greater than or equal to 10A.

9. The battery cell according to claim 1, characterized in that: The output voltage of the battery pack is greater than or equal to 3.6V.

10. The battery cell according to claim 1, characterized in that: The battery cells are connected in series and / or in parallel with each other.

11. The battery cell according to claim 1, characterized in that: The maximum discharge rate of the battery pack is 10C.

12. A battery pack comprising: a housing selectively connectable to and supportable by different power tools; A battery pack, comprising a plurality of battery cells, each of which comprises a positive electrode tab and a negative electrode tab, wherein the plurality of battery cells are arranged along a third direction; The battery cell is characterized in that two ends of the battery cell along the first direction are respectively a first end face and a second end face, one of the positive electrode tab and the negative electrode tab is arranged on the first end face, and the other is arranged on the second end face, and the first direction is perpendicular to the third direction; In the third direction, the distance between the positive electrode tabs of two adjacent battery cells is less than or equal to 20 mm; and / or, in the third direction, the distance between the negative electrode tabs of two adjacent battery cells is less than or equal to 20 mm.

13. The battery pack according to claim 9, characterized in that: The distance between the positive electrode tabs of any two adjacent battery cells is equal; and / or the distance between the negative electrode tabs of any two adjacent battery cells is equal.

14. The battery pack according to claim 9, characterized in that: The battery cells are connected in series and / or in parallel with each other.

15. The battery pack according to claim 9, characterized in that: A ratio of a width of the battery pack along the second direction to a length of the battery pack along the first direction is less than or equal to 0.5, and the first direction, the second direction and the third direction are perpendicular to each other.

16. The battery pack according to claim 9, characterized in that: When the output voltage of the battery pack is greater than or equal to 3.6V, the maximum discharge rate of the battery pack is greater than or equal to 10C.

17. A battery pack comprising: a housing selectively connectable to and supportable by different power tools; A battery pack, comprising a plurality of battery cells, wherein the battery cells include a positive electrode tab and a negative electrode tab; Characterized in that two ends of the battery cell along the first direction are respectively a first end face and a second end face, and two ends of the battery cell along the second direction are respectively a third end face and a fourth end face, and the second direction is perpendicular to the first direction; The first end surfaces of at least some of the battery cells are not coplanar, and / or the third end surfaces of at least some of the battery cells are not coplanar.

18. The battery pack according to claim 17, characterized in that: On each of the battery cells, one of the positive electrode tab and the negative electrode tab is located on the first end surface, and the other is located on the second end surface.

19. The battery pack according to claim 17, characterized in that: The battery cells are connected in series and / or in parallel with each other.

20. The battery pack according to claim 17, characterized in that: Also includes: A circuit board is electrically connected to the tab; the circuit board includes a first circuit board and a second circuit board, the first circuit board is close to the first end surface and electrically connected to the tab on the first end surface, and the second circuit board is close to the second end surface and electrically connected to the tab on the second end surface.

21. The battery pack according to claim 20, characterized in that: The circuit board has at least one solder groove, the solder groove is connected to the tab, and the number of the solder grooves is less than or equal to the number of the tabs.

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