Battery monomer, battery pack and electric equipment

Abstract

The utility model discloses a battery monomer, a battery pack and electric equipment, and the battery monomer comprises a shell which comprises a first end cover and a second end cover which are oppositely arranged along a first direction; the two poles are respectively arranged at the second part of the first end cover and the fourth part of the second end cover; the battery cell is provided with two tabs which are respectively opposite to the first part of the first end cover and the third part of the second end cover; and each of the two adapter sheets comprises a first connecting part and a second connecting part, the first connecting part is connected with the tab with the same polarity as the first connecting part, and the second connecting part is connected with the pole with the same polarity as the second connecting part. Therefore, the space of the assembly gap in the shell and the exposed extension part of the pole are overlapped and utilized, and the two electric connection parts of the tab-the first connection part and the second connection part-the pole are horizontally arranged along the second direction, so that the space occupancy rate of the assembly gap and the exposed extension part along the length direction of the single battery is effectively reduced; and the volume energy density of the single battery is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a battery cell, a battery pack including the above battery cell, and an electrical device including the above battery pack. Background Art

[0002] With the rapid development of new energy vehicles, users have higher and higher requirements for the cruising range. As a key factor in improving the cruising range, the improvement of the battery energy density has always been an important goal in the iterative development of batteries. The development of high-energy-density blade battery cells has further promoted the application of technologies such as CTP, which not only optimizes the assembly method of the battery pack but also greatly improves the overall space utilization rate of the battery pack, and simultaneously improves the energy density of the battery pack.

[0003] For a battery cell of a blade battery, two tab ears are located at both ends of the battery cell along the length direction, and the tab ears need to be electrically connected to the terminal posts through adapter plates. In the prior art, since the tab ears, adapter plates, and terminal posts are arranged in sequence along the length direction of the battery cell, a certain assembly gap needs to be reserved at the lower end of the cover plate for the connection of the above three components; moreover, along the length direction of the battery cell, the terminal post includes an exposed extension part protruding from the cover plate; as above, the assembly gap and the exposed extension part occupy a large percentage of the length direction of the battery cell, affecting the space utilization rate of the battery cell. Summary of the Utility Model

[0004] In view of this, the present application provides a battery cell, a battery pack including the above battery cell, and an electrical device including the above battery pack, which solve the problem of low space utilization rate of the battery cell along the length direction.

[0005] A battery cell of the present utility model includes:

[0006] A housing including a first end cover and a second end cover oppositely arranged along a first direction; along a second direction, the first end cover includes a first part and a second part, and the second end cover includes a third part and a fourth part; the first direction and the second direction are perpendicular to each other;

[0007] Two terminal posts with opposite polarities are respectively arranged on the second part and the fourth part;

[0008] A battery core is arranged in the housing. The battery core has a battery core body, and the battery core body includes a first end face facing the first end cover and a second end face facing the second end cover. Tab ears are led out from both the first end face and the second end face of the battery core body, and the two tab ears are respectively opposite to the first part and the third part;

[0009] Two connection pieces with opposite polarities are arranged inside the housing. Both of the two connection pieces include a first connection part and a second connection part. The first connection part is connected to a tab with the same polarity, and the second connection part is connected to the pole column with the same polarity.

[0010] Wherein, the second part is closer to the first end face of the battery cell main body than the first part, and the fourth part is closer to the second end face of the battery cell main body than the third part.

[0011] Optionally, in the above battery cell, the second part of the first end cap and the fourth part of the second end cap are arranged opposite to each other along the first direction.

[0012] Optionally, in the above battery cell, at least one of the two connection pieces is a first connection member. The first connection member includes a first connection part, a second connection part, a torsion part and a third connection part. The third connection part is located between the second connection part and the battery cell. The first connection part and the second connection part are arranged perpendicular to each other, and the first direction is perpendicular to the second connection part. One end of the second connection part and the third connection part along the third direction can be turned and connected, and one end of the third connection part along the second direction is connected to the first connection part through the torsion part.

[0013] Optionally, in the above battery cell, insulating parts are arranged on the part of the first end face of the battery cell main body facing the pole column and the part of the second end face of the battery cell main body facing the pole column.

[0014] Optionally, in the above battery cell,

[0015] Along the first direction, the height by which the pole column arranged on the second part protrudes from the second part is 2 mm - 5 mm; along the first direction, the height by which the pole column arranged on the fourth part protrudes from the fourth part is 2 mm - 5 mm.

[0016] And / or,

[0017] Along the first direction, the pole column arranged on the second part does not protrude from the first part; along the first direction, the pole column arranged on the fourth part does not protrude from the third part.

[0018] Optionally, in the above battery cell, along the first direction, the distance between the first part and the third part is L1, and the distance between the second part and the fourth part is L2, and 3 mm ≤ L1 - L2 ≤ 10 mm.

[0019] A battery pack includes a plurality of battery cells as described above.

[0020] Optionally, the above battery pack further includes an external connector, which has a plurality of card slots, and the plurality of card slots are snap-connected to the pole posts of the battery cells one by one to achieve electrical connection of the plurality of battery cells.

[0021] Optionally, in the above battery pack,

[0022] Along the third direction, the width of the card slot is L3, and the width of the pole post is L4, where L3 ≤ L4, 0 ≤ L3 - L4 ≤ 25 mm, and 10 mm ≤ L4 ≤ 50 mm;

[0023] and / or,

[0024] The contact resistance value between the card slot and the pole post is 0.01 mΩ - 2 mΩ.

[0025] An electrical device of the present invention includes the battery pack as described above.

[0026] In the battery cell, battery pack and electrical device provided by the present application, the second part is closer to the first end face of the battery cell main body than the first part, the fourth part is closer to the second end face of the battery cell main body than the third part, the tab led out from the first end face of the battery cell is disposed opposite to the first part, the tab led out from the second end face of the battery cell is disposed opposite to the third part, and two pole posts with opposite polarities are respectively disposed in the second part and the fourth part. As described above, the assembly gap inside the housing and the exposed extension of the pole post are utilized by spatial overlap. This method changes the layered design of the electrical connection of the tab - adapter - pole post along the first direction, and makes the two electrical connection points of the tab - first connection part, second connection part - pole post horizontally disposed along the second direction, effectively reducing the space occupancy rate of the assembly gap and the exposed extension along the length direction of the battery cell, and greatly improving the volume energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of the battery cell of the present application;

[0029] Figure 2 It is a schematic structural diagram of the battery cell of the present application;

[0030] Figure 3 It is a cross-sectional view of the battery cell along the third direction;

[0031] Figure 4 Cross-sectional view of a battery cell along the second direction;

[0032] Figure 5 Schematic structural diagram of a first adapter;

[0033] Figure 6 Schematic structural diagram of a first adapter;

[0034] Figure 7 Cross-sectional view of a battery cell of another embodiment along the third direction;

[0035] Figure 8 Cross-sectional view of a battery cell of another embodiment along the second direction;

[0036] Figure 9 Cross-sectional view of a battery cell of yet another embodiment along the third direction;

[0037] Figure 10 Cross-sectional view of a battery cell of yet another embodiment along the second direction;

[0038] Figure 11 Schematic structural diagram of a second adapter;

[0039] Figure 12 Schematic structural diagram of a second adapter;

[0040] Figure 13 Exploded view of the battery pack of the present application;

[0041] Figure 14 Cross-sectional view of the battery pack of the present application along the third direction;

[0042] Figure 15 Cross-sectional view of the battery pack of the present application along the second direction.

[0043] Figures 1 - 15 In:

[0044] 1. Outer shell; 2. Battery cell; 3. Adapter plate; 4. Tab; 5. Terminal; 6. External connector; 7. Cover plate; 8. Battery cell;

[0045] 11. First end cap; 12. Second end cap;

[0046] 31. First connection part; 32. Second connection part; 33. Torsion part; 34. Third connection part; 35. Intermediate connection part;

[0047] 41. First electrical connection part;

[0048] 61. Card slot;

[0049] 111. First part; 112. Second part;

[0050] 121. The third part; 122. The fourth part. Detailed implementation manners

[0051] This application provides a battery cell, a battery pack including the above battery cell, and an electrical device including the above battery pack. The assembly gap inside the housing and the exposed extension of the pole post are utilized with spatial overlap. This method changes the stacked design of the electrical connection of the tab - adapter - pole post along the first direction, and adopts the horizontal arrangement of the two electrical connection parts of the tab - the first connection part, the second connection part - the pole post along the second direction, effectively reducing the space occupancy rate of the assembly gap and the exposed extension of the pole post along the length direction of the battery cell, and greatly improving the volume energy density of the battery cell.

[0052] In some embodiments of this application, the battery cell can be a secondary battery cell, which refers to a battery cell that can activate the active material through charging after discharging. The battery cell can be a lithium - ion battery cell, a sodium - ion battery cell, a sodium - lithium - ion battery cell, a lithium - metal battery cell, a sodium - metal battery cell, a lithium - sulfur battery cell, a magnesium - ion battery cell, a nickel - metal hydride battery cell, a nickel - cadmium battery cell, a lead - acid battery cell, etc., and this application embodiment does not limit this. As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell or a battery cell of other shapes. The prismatic battery cell includes a square - shell battery cell, a blade - shaped battery cell, a multi - prismatic battery cell. The multi - prismatic battery cell is, for example, a hexagonal - prismatic battery cell, etc., and this application has no special limitation. Preferably, the battery cell is a lithium - ion battery cell, and the battery cell is a blade - shaped battery cell.

[0053] Next, the technical solutions in the embodiments of this application will be clearly and completely described with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0054] Embodiment 1

[0055] As Figures 1 - 11 shown, a battery cell of this embodiment includes a housing 1, two pole posts 5 with opposite polarities, an electric core 2, and two adapter plates 3 with opposite polarities.

[0056] Please refer to the attached Figure 1, along the first direction, the housing 1 includes a first end cap 11 and a second end cap 12 which are oppositely arranged. Along the second direction, the first end cap 11 includes a first part 111 and a second part 112. Along the second direction, the second end cap 12 includes a third part 121 and a fourth part 122. One of the two pole columns 5 with opposite polarities is arranged on the second part 112, and the other pole column 5 is arranged on the fourth part 122; specifically, the pole column 5 arranged on the second part 112 is the positive pole column, and the pole column 5 arranged on the fourth part 122 is the negative pole column.

[0057] It should be noted that the first direction is the length direction of the battery cell, that is, the direction indicated by the arrow in the attached Figure 1 figure; the second direction is the width direction of the battery cell, that is, the direction indicated by the arrow in the attached Figure 1 figure.

[0058] Specifically in this embodiment, the housing 1 includes a shell body. Both ends of the shell body are provided with openings along the first direction, and the first end cap 11 and the second end cap 12 are respectively welded to the openings at both ends of the shell body. Of course, the housing 1 can also be other forms of structures, as long as it is ensured that the two pole columns can be respectively arranged on the first end cap 11 and the second end cap 12, and the battery core 2 can be installed inside the housing 1.

[0059] Among them, it should also be noted that, among the two pole columns 5, one pole column 5 is insulated from the first end cap 11, and the other pole column 5 is also insulated from the second end cap 12.

[0060] Continuing Figure 1 , the battery core 2 is arranged inside the housing 1. The battery core 2 has a battery core body. The battery core body includes a first end face facing the first end cap 11 and a second end face facing the second end cap 12. Pole tabs 4 are led out from both the first end face and the second end face of the battery core body; among the two pole tabs 4, one pole tab 4 is opposite to the first part 111, and the other pole tab 4 is opposite to the third part 121; specifically, the pole tab 4 facing the first part 111 is the positive pole tab, and the pole tab 4 facing the third part 121 is the negative pole tab.

[0061] Continuing Figure 1 , in order to make the two electrical connection points of the pole tab - first connection part and the second connection part - pole column horizontally arranged along the second direction, it is designed that the second part 112 is closer to the first end face of the battery core body than the first part 111. As above, the first end cap 11 is in a first-order stepped form, and the area of the battery cell opposite to the position of the second part 112 forms a first recessed space; the fourth part 122 is closer to the second end face of the battery core body than the third part 121. As above, the second end cap 12 is in a first-order stepped form, and the area of the battery cell opposite to the position of the fourth part 122 forms a second recessed space.

[0062] It should be noted that the first recessed space is used to accommodate the pole ear 4 with positive polarity, so as to provide an accommodation space for the connection between the pole ear 4 with positive polarity and the transfer piece 3 with positive polarity. The second recessed space is used to accommodate the pole ear 4 with negative polarity, so as to provide an accommodation space for the connection between the pole ear 4 with negative polarity and the transfer piece 3 with negative polarity.

[0063] Continuing Figure 1 , two transfer pieces 3 with opposite polarities are arranged in the housing 1. Both transfer pieces 3 include a first connection portion 31 and a second connection portion 32. The first connection portion 31 is connected to the pole ear 4 with the same polarity as it, and the second connection portion 32 is connected to the pole column 5 with the same polarity as it.

[0064] It should be noted that, for the convenience of manufacturing, the two transfer pieces 3 with opposite polarities are both integrally formed structures. Among them, the first connection portion 31 of the transfer piece 3 and the pole ear 4 with the same polarity as it are connected by ultrasonic welding, and the second connection portion 32 of the transfer piece 3 and the pole column 5 with the same polarity as it are connected by laser welding.

[0065] Please refer to the attached Figure 1 , in some embodiments of the present application, the second part 112 of the first end cap 11 and the fourth part 122 of the second end cap 12 are arranged opposite to each other along the first direction. That is, along the first direction, the positive pole column and the negative pole column are arranged opposite to each other, and the positive pole ear and the negative pole ear are arranged opposite to each other.

[0066] As above, an axisymmetric layout of the positive pole ear and the negative pole ear and an axisymmetric layout of the positive pole column and the negative pole column are formed. This not only minimizes the length of the current transmission path, helps to minimize the resistance, optimizes the current distribution, and improves the charge and discharge rate, but also simplifies the assembly process of the battery cell, reduces the production cost, and improves the production efficiency.

[0067] It should be noted that, please refer to the attached Figure 2 , the second part 112 of the first end cap 11 and the third part 121 of the second end cap 12 are arranged opposite to each other along the first direction. That is, along the first direction, the positive pole ear and the negative pole column are arranged opposite to each other, and the negative pole ear and the positive pole column are arranged opposite to each other. As above, a non-axisymmetric layout of the positive pole ear and the negative pole ear and a non-axisymmetric layout of the positive pole column and the negative pole column are formed, which enriches the layout forms of the pole ear 4 and the pole column 5, and users can choose according to actual needs, with strong flexibility and applicability.

[0068] Please refer to the attached Figures 3 - 6 , in some embodiments of the present application, the pole ear 4 has a first electrical connection portion 41 extending along the first direction. The first electrical connection portion 41 and the first connection portion 31 with the same polarity as it are arranged in parallel, and the first electrical connection portion 41 and the first connection portion 31 with the same polarity as it are electrically connected.

[0069] Since the thickness of the battery cell 2 is T along the third direction, when T ≤ 25 mm, it is beneficial to bend the tab 4. In other words, the number of layers of the stacked tabs 4 is not particularly large, so the tab bending is convenient; when T ≥ 25 mm, the tab 4 can be bent or not bent. In other words, when the number of layers of the stacked tabs 4 is too large, considering the difficulty of bending, the tab 4 can be not bent. Therefore, please refer to the appendix Figure 4 , in this embodiment, the tab 4 is not bent, and the first electrical connection portion 41 extends along the first direction. As described above, the length of the tab 4 can be shortened, thereby reducing the space occupied by the tab 4 inside the housing.

[0070] Specifically in this embodiment, the tab 4 led out from the first end face of the battery cell body extends along the first direction, and the tab 4 led out from the second end face of the battery cell body extends along the first direction. In order to electrically connect the tab 4 of the battery cell with the pole column having the same polarity and also to enable the end cover to be connected to the housing, the two adapter plates 3 are designed as the first adapter members. Please refer to the appendix Figure 5 , the first adapter member includes a first connection portion 31, a second connection portion 32 and a torsion portion 33. The setting of the torsion portion 33 ensures that while the first connection portion 31 and the second connection portion 32 are perpendicularly arranged, the connection area between the first connection portion 31 and the second connection portion 32 can be maximized, thereby ensuring the current-carrying capacity from the first connection portion 31 to the second connection portion 32.

[0071] Specifically in this embodiment, the torsion portion 33 and the first connection portion 31 with positive polarity are both accommodated in the first recessed space, and the torsion portion 33 and the first connection portion 31 with negative polarity are both accommodated in the second recessed space.

[0072] Please refer to the appendix Figure 6 , further, in order to avoid affecting the battery cell when the second connection portion 32 is welded to the pole column 5, the first adapter member includes a first connection portion 31, a second connection portion 32, a torsion portion 33 and a third connection portion 34. The first connection portion 31 and the second connection portion 32 are perpendicularly arranged. The third connection portion 34 is located between the second connection portion 32 and the battery cell. One end of the second connection portion 32 and the third connection portion 34 along the third direction can be foldably connected, and one end of the third connection portion 34 along the second direction is connected to the first connection portion 31 through the torsion portion 33.

[0073] Specifically, when the end cover is not covered on the opening of the housing and the battery cell 2 has been installed in the housing, the third connection portion 34 enables the second connection portion 32 to extend out of the housing along the third direction and perform welding work with the pole column 5. After the second connection portion 32 and the pole column 5 are welded, when the end cover is covered on the opening of the housing, the second connection portion 32 and the third connection portion 34 are relatively folded along the third direction, so that the third connection portion 34 is located between the second connection portion 32 and the battery cell 2.

[0074] It should be noted that a crease is provided between the second connecting portion 32 and the third connecting portion 34, which facilitates the relative folding of the second connecting portion 32 and the third connecting portion 34.

[0075] Furthermore, in order to avoid the risk of short circuit due to the too close distance between the battery cell 2 and the adapter piece 3, insulating members are provided between the part of the first end face of the battery cell body facing the pole column 5 and the third connecting portion 34, and between the part of the second end face of the battery cell body facing the pole column 5 and the third connecting portion 34. Specifically, the insulating member is provided on the side of the third connecting portion 34 facing the battery cell body. Among them, the insulating member can be insulating adhesive tape, can be an insulating layer formed by coating, or can also be a plastic part formed by injection molding. There is no specific limitation as long as it can play an insulating role.

[0076] It should be noted that when the first connecting portion 31 and the second connecting portion 32 are only connected by the torsion portion 33, the insulating member is provided at the connection between the second connecting portion 32 and the pole column 5.

[0077] In some embodiments of the present application, in order to prevent welding slag from falling into the shell at the welding joint between the first electrical connection portion 41 of the electrode tab 4 and the first connection portion 31 of the first adapter, an insulating member is designed to be provided at the connection between the first electrical connection portion 41 of the electrode tab 4 and the first connection portion 31 of the first connector.

[0078] It should be noted that the insulating member can be insulating adhesive tape, can be an insulating layer formed by coating, or can also be a plastic part formed by injection molding. There is no specific limitation as long as it can play an insulating role.

[0079] In some embodiments of the present application, along the first direction, the height of the pole column 5 provided on the second part 112 protruding from the second part 112 is 2 mm - 5 mm; that is, the height of the positive electrode exposed extension of the positive pole column is 2 mm - 5 mm; for example, it can be any one of 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm.

[0080] Furthermore, along the first direction, the height of the pole column 5 provided on the fourth part 122 protruding from the fourth part 122 is 2 mm - 5 mm; that is, the height of the negative electrode exposed extension of the negative pole column is 2 mm - 5 mm; for example, it can be any one of 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm.

[0081] The height of the exposed extension of the terminal post 5 is limited within the range of 2 mm to 5 mm. On the premise of ensuring the volumetric energy density of the battery cell, it can not only ensure good electrical connection between the terminal post 5 and the external connecting member, avoiding problems of high contact resistance and heat generation caused by poor contact, but also the relatively protruding height of the terminal post 5 helps to fix the terminal post 5, preventing loosening caused by vibration or impact during transportation and use, and ensuring the stability of the battery cell under various conditions.

[0082] In some embodiments of the present application, along the first direction, the terminal post 5 provided on the second part 112 does not protrude from the first part 111; that is, the positive terminal post does not protrude from the first part 111. As above, it is ensured that the positive exposed extension of the positive terminal post is located within the first recessed space, and the positive terminal post does not additionally occupy the space of the battery cell along the length direction, improving the volumetric energy density of the battery cell.

[0083] Furthermore, along the first direction, the terminal post 5 provided on the fourth part 122 does not protrude from the third part 121; that is, the negative terminal post does not protrude from the third part 121. As above, it is ensured that the negative exposed extension of the negative terminal post is located within the second recessed space, and the negative terminal post does not additionally occupy the space of the battery cell along the length direction, improving the volumetric energy density of the battery cell.

[0084] In some embodiments of the present application, along the first direction, the distance between the first part 111 and the third part 121 is L1, and the distance between the second part 112 and the fourth part 122 is L2, and 3 mm ≤ L1 - L2 ≤ 10 mm; for example, L1 - L2 can be any one of 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm.

[0085] As above, the space utilization rate of the battery cell along the length direction can be increased by 5% - 8%, and the volumetric energy density of the battery cell can be increased by 8% - 15%.

[0086] It should be noted that each battery cell has 1 to 4 battery cores 2; for example, it can be any one of 1, 2, 3, 4.

[0087] Please refer to the atta Figures 13 - 15 chment. Based on the above battery cell, the embodiment of the present application further provides a battery pack, which includes a plurality of battery cells 8 arranged side by side, and the battery cells 8 are the battery cells described above.

[0088] Specifically, the battery pack includes a box body and a plurality of battery cells 8, and the plurality of battery cells 8 are directly arranged in the box body. Or, the battery pack includes a box body and a plurality of battery modules, and each battery module includes a plurality of battery cells 8.

[0089] In some embodiments of the present application, the battery pack further includes an external connector 6, the external connector 6 has a plurality of card slots 61, and the plurality of card slots 61 are snap-connected to the pole posts 5 of the battery cells 8 one by one to achieve electrical connection of the plurality of battery cells 8.

[0090] It should be noted that the card slot 61 and the pole post are in a tight fit. There is a pressing pin in the card slot 61, and the pressing pin of the card slot 61 contacts the pole post 5 to achieve electrical connection between the card slot 61 and the pole post 5. All the card slots 61 of the external connector 6 have an electrical connection relationship, so the pole posts 5 clamped in each card slot 61 also have an electrical connection relationship.

[0091] The external connector 6 adopts a card slot design, eliminating the traditional method of laser welding the external connector to multiple pole posts 5 of the battery cell, improving the assembly production efficiency of the battery pack, facilitating subsequent disassembly and repair, and effectively reducing the after-sales maintenance cost.

[0092] In some embodiments of the present application, along the third direction, the width of the card slot 61 is L3, and the width of the pole post 5 is L4, L3 ≤ L4, 0 ≤ L3 - L4 ≤ 25 mm, 10 mm ≤ L4 ≤ 50 mm; for example, L3 - L4 can be any one of 0, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm; L4 can be any one of 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm.

[0093] As above, it is ensured that the width of the card slot 61 is smaller than the width of the pole post 5, and the card slot 61 has a certain elastic deformation so that the card slot 61 can be snap-connected to the pole post 5 to achieve a tight fit between the card slot 61 and the pole post 5. Moreover, by limiting the dimensions within the above range, on the basis of ensuring the volume energy density of the battery pack, it can ensure that the pole post 5 and the card slot 61 have a sufficient contact area to ensure a reliable fixing effect between the two.

[0094] In some embodiments, the contact resistance value between the card slot 61 and the pole post 5 is 0.01 mΩ - 2 mΩ; for example, it can be any one of 0.01 mΩ, 0.02 mΩ, 0.03 mΩ, 0.04 mΩ, 0.05 mΩ, 0.1 mΩ, 0.2 mΩ, 0.3 mΩ, 0.4 mΩ, 0.5 mΩ, 1 mΩ, 1.5 mΩ, 2 mΩ.

[0095] The contact resistance is the resistance existing between the electrical connection contact surfaces of the card slot 61 and the pole post 5; by limiting the contact resistance value within the above range, it can ensure the electrical connection performance between the card slot 61 and the pole post 5, avoid energy loss, reduce temperature rise, reduce safety risks, and increase reliability.

[0096] Based on the above battery pack, an embodiment of the present application further provides an electrical device, which includes the battery pack, and the battery pack is the battery pack described above.

[0097] The electrical device can be in various forms. For example, it can be an automobile, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The automobile can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, such as an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, a power planer, etc. No special restrictions are imposed on the above electrical devices herein.

[0098] Since the electrical device includes the battery pack described above, for the beneficial effects brought by the battery pack to the electrical device, please refer to the above, and will not be elaborated here one by one.

[0099] Embodiment 2

[0100] The basic structure of a battery cell in this embodiment is the same as that in Embodiment 1, except that: among the two connecting tabs 3, one is a first connecting member (please refer to the appendix Figures 5 - 6 ), and the other is a second connecting member (please refer to the appendix Figures 11 - 12 ). Correspondingly, among the two electrode tabs 4, the first electrical connection portion 41 of one electrode tab 4 extends along the first direction (please refer to the appendix Figures 3 - 4 ), and the first electrical connection portion 41 of the other electrode tab 4 is perpendicular to the first direction (the first electrical connection portion 41 being perpendicular to the first direction includes at least two setting manners. Manner 1: Please refer to the appendix Figures 7 - 8 , and there is one battery cell 2 in this battery cell; Manner 2: Please refer to the appendix Figures 9 - 10 , and there are two battery cells 2 arranged in a combined manner in this battery cell), that is to say, one electrode tab 4 is not bent, and the other electrode tab 4 is bent.

[0101] Among them, the basic structure of the first connecting member and its connection structure with the electrode tab 4 are the same as those described in Embodiment 1, and will not be elaborated here specifically.

[0102] Please refer to the appendix Figure 11, the second adapter includes a first connection portion 31, a second connection portion 32, and an intermediate connection portion 35 located between the first connection portion 31 and the second connection portion 32. The intermediate connection portion 35 is arranged such that the first connection portion 31 and the second connection portion 32 are parallel to each other while there is a height difference between the first connection portion 31 and the second connection portion 32. Among them, please refer to the appendix Figure 8 , 10 , the tab 4 is bent, and the first electrical connection portion 41 formed by the bent tab 4 is connected to the first connection portion 31.

[0103] Please refer to the appendix Figure 12 , further, in order to prevent the second connection portion 32 and the pole column 5 from affecting the battery cell 2 during welding connection, the second adapter further includes a third connection portion 34. The second connection portion 32 and the third connection portion 34 are stacked, and one end of the second connection portion 32 and the third connection portion 34 in the third direction can be foldably connected. One end of the third connection portion in the second direction is connected to the first connection portion 31 through the intermediate connection portion 35.

[0104] Among them, it should be noted that in order to facilitate the relative folding of the second connection portion 32 and the third connection portion 34, a crease is provided between the second connection portion 32 and the third connection portion 34.

[0105] The components and devices involved in this application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the drawings. As those skilled in the art will recognize, these components and devices can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The word "or" and "and" used herein refer to the word "and / or", and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with each other.

[0106] It should also be noted that in the device of this application, each component can be disassembled and / or recombined. These disassembly and / or recombination should be regarded as equivalent solutions of this application.

[0107] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0108] The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0109] The foregoing are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that, Comprising: A housing (1) including a first end cap (11) and a second end cap (12) oppositely arranged in a first direction; in a second direction, the first end cap (11) includes a first part (111) and a second part (112), and the second end cap (12) includes a third part (121) and a fourth part (122); the first direction and the second direction are perpendicular to each other; Two pole columns (5) with opposite polarities, respectively arranged on the second part (112) and the fourth part (122); A battery cell (2) arranged inside the housing (1), the battery cell (2) having a battery cell main body, the battery cell main body including a first end face facing the first end cap (11) and a second end face facing the second end cap (12), pole tabs (4) are led out from both the first end face and the second end face of the battery cell main body, and the two pole tabs (4) are respectively arranged opposite to the first part (111) and the third part (121); Two adapter plates (3) with opposite polarities, arranged inside the housing (1), both of the two adapter plates (3) include a first connection portion (31) and a second connection portion (32), the first connection portion (31) is connected to the pole tab (4) with the same polarity as it, and the second connection portion (32) is connected to the pole column (5) with the same polarity as it; Wherein, the second part (112) is closer to the first end face of the battery cell main body than the first part (111), and the fourth part (122) is closer to the second end face of the battery cell main body than the third part (121).

2. The battery cell according to claim 1, characterized in that, The second part (112) of the first end cap (11) and the fourth part (122) of the second end cap (12) are arranged opposite to each other in the first direction.

3. The battery cell according to claim 1, characterized in that, At least one of the two adapter plates (3) is a first adapter member, the first adapter member includes a first connection portion (31), a second connection portion (32), a torsion portion (33) and a third connection portion (34), the third connection portion (34) is located between the second connection portion (32) and the battery cell, the first connection portion (31) and the second connection portion (32) are perpendicularly arranged, and the first direction and the second connection portion (32) are perpendicularly arranged; one end of the second connection portion (32) and the third connection portion (34) in a third direction can be foldably connected, and one end of the third connection portion (34) in the second direction is connected to the first connection portion (31) through the torsion portion (33).

4. The battery cell according to claim 3, wherein Insulating members are arranged between the part of the first end face of the battery cell main body facing the pole column (5) and the third connection portion (34) and between the part of the second end face of the battery cell main body facing the pole column (5) and the third connection portion (34).

5. The battery single body according to any one of claims 1 to 4, wherein Along the first direction, the height by which the terminal post (5) provided on the second part (112) protrudes from the second part (112) is 2 mm to 5 mm; along the first direction, the height by which the terminal post (5) provided on the fourth part (122) protrudes from the fourth part (122) is 2 mm to 5 mm. and / or Along the first direction, the terminal post (5) provided on the second part (112) does not protrude from the first part (111); along the first direction, the terminal post (5) provided on the fourth part (122) does not protrude from the third part (121).

6. The battery cell according to claim 5, characterized in that, Along the first direction, the distance between the first part (111) and the third part (121) is L1, and the distance between the second part (112) and the fourth part (122) is L2, where 3 mm ≤ L1 - L2 ≤ 10 mm.

7. A battery pack, characterized in that, comprising a plurality of battery cells according to any one of claims 1 to 6.

8. The battery pack according to claim 7, wherein It further includes an external connector (6), and the external connector (6) has a plurality of card slots (61), and the plurality of card slots (61) are respectively and detachably connected to the terminal posts (5) of the battery cells to realize electrical connection of the plurality of battery cells.

9. The battery pack according to claim 8, wherein Along the third direction, the width of the card slot (61) is L3, and the width of the terminal post (5) is L4, where L3 ≤ L4, 0 ≤ L3 - L4 ≤ 25 mm, and 10 mm ≤ L4 ≤ 50 mm; and / or The contact resistance value between the card slot (61) and the terminal post (5) is 0.01 mΩ - 2 mΩ.

10. An electrical device, characterized in that, comprising a battery pack according to any one of claims 7 to 9.

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