Battery and electric device

Abstract

The invention relates to the technical field of new energy batteries, and discloses a battery and a power utilization device, which can ensure the distance between a first tab and a pole as well as between a second tab and the pole, prevent the tail ends of the first tab and the second tab from being arranged between the pole and an adapter, ensure the welding quality of the pole and the adapter, ensure the overcurrent capacity between the pole and the adapter and improve the reliability of the battery. And meanwhile, the over-current capability of the first tab and the second tab is not influenced. The battery comprises a first battery cell, a second battery cell, an adapter and a pole, the first battery cell comprises a first battery cell body and a first tab, the second battery cell comprises a second battery cell body and a second tab, the first tab and the second tab are at least partially arranged on the upper portion of the first surface of the adapter and electrically connected with the first surface, and the pole is electrically connected with the first surface and electrically connected with the second surface of the adapter. On the first surface, along the width direction of the battery, the distance between the root part of the first tab and the root part of the second tab is a, the distance between the tail end of the first tab and the tail end of the second tab is b, and a-b is more than or equal to 10mm and less than or equal to 65mm.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a battery and an electrical device. Background Art

[0002] With the continuous development of new energy technologies, new energy batteries, as an environmentally friendly energy storage and release device, have been widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, as well as in many technical fields such as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace, etc.

[0003] In existing batteries, the tabs leading from the battery cell are typically bent and tightened and fixed to the bottom surface of the adapter, resulting in low internal battery space utilization and affecting battery energy density. To improve space utilization in the battery's height direction, the tabs are bent to the top surface of the adapter. However, this arrangement makes it easy for the tab ends to overlap the position between the terminal post and the adapter, which can easily cause poor soldering between the terminal post and the adapter, affecting the overall welding quality. Summary of the Invention

[0004] In view of this, the present invention provides a battery and an electrical device to solve the problem in existing batteries that the end of the pole ear located on the upper surface of the adapter easily causes poor welding between the pole and the adapter, affecting the welding quality and current carrying capacity of the pole and the adapter.

[0005] In a first aspect, the present invention provides a battery comprising:

[0006] A first battery cell, comprising a first battery cell body and a first tab, wherein the first tab is extended from the first battery cell body, and the first tab comprises a root portion connected to the first battery cell body and an end away from the first battery cell body;

[0007] A second battery cell, comprising a second battery cell body and a second tab, wherein the second tab is led out from the end of the second battery cell body, and the second tab comprises a root portion connected to the end of the second battery cell body and an end away from the second battery cell body;

[0008] The end of the first battery cell leading to the first electrode tab and the end of the second battery cell leading to the second electrode tab are located on the same side, and the polarity of the first electrode tab and the second electrode tab are the same;

[0009] A transition piece, wherein a small portion of the first and second tabs are disposed on an upper portion of a first surface of the transition piece and are electrically connected to the first surface, the first surface is disposed away from the first and second cell bodies, the first surface has a pole connection area, and a portion of the pole connection area is disposed opposite to an end of the first and second tabs;

[0010] a pole, electrically connected to the pole connection area;

[0011] On the first surface, along the width direction of the battery, the distance between the root of the first electrode tab and the root of the second electrode tab is a, and the distance between the end of the first electrode tab and the end of the second electrode tab is b, satisfying: 10 mm ≤ ab ≤ 65 mm.

[0012] Beneficial effects: The battery of the present invention includes a first cell and a second cell, the first tab and the second tab are at least partially disposed on the upper portion of the first surface of the adapter and electrically connected to the first surface, the pole is electrically connected to the pole connection area of ​​the first surface, and on the first surface, along the width direction of the battery, the distance between the root of the first tab and the root of the second tab is a, and the distance between the end of the first tab and the end of the second tab is b, satisfying the following: 10mm≤ab≤65mm. In a dual-cell battery, the internal setting space is limited. By controlling the distance a between the root of the first tab and the root of the second tab, and the distance b between the end of the first tab and the end of the second tab, the distance between the first tab and the pole, and the distance between the second tab and the pole are ensured, so that the ends of the first tab and the second tab will not be placed between the pole and the adapter, which will not cause a cold weld between the pole and the adapter, thereby ensuring the welding quality between the pole and the adapter and further ensuring the current flow capacity between the pole and the adapter.

[0013] Moreover, the distance a between the root of the first pole ear and the root of the second pole ear, and the distance b between the end of the first pole ear and the end of the second pole ear satisfy 10mm≤ab≤65mm. Within the above range, the ends of the first pole ear and the second pole ear are not easily placed in the gap between the pole and the adapter, which is not likely to cause cold welding between the pole and the adapter, thereby ensuring the welding quality of the pole and the adapter and the overcurrent capacity between the pole and the adapter. At the same time, the electrical connection area between the first pole ear and the adapter and the electrical connection area between the second pole ear and the adapter will not be too small, thereby ensuring the overcurrent capacity of the first pole ear and the adapter and the overcurrent capacity of the second pole ear and the adapter. When the battery is fast charged at a high rate, the first pole ear and the second pole ear will not generate much heat, and the risk of thermal runaway will not easily occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 is an overall schematic diagram of the battery of the present invention;

[0016] Figure 2 Schematic diagram of the battery of the present invention (top portion structure and housing omitted);

[0017] Figure 3 for Figure 2 A top view of

[0018] Figure 4 for Figure 1 Cross-sectional view along the A-A' direction;

[0019] Figure 5 for Figure 4 An enlarged schematic diagram of part B;

[0020] Figure 6 for Figure 5 A magnified schematic diagram of part C;

[0021] Figure 7 This is a schematic diagram of the battery tab in the unfolded state of the present invention;

[0022] Figure 8 A top view of the positive electrode adapter in the battery of the present invention;

[0023] Figure 9 It is a three-dimensional diagram of the positive electrode adapter in the battery of the present invention.

[0024] Description of reference numerals:

[0025] 1. First battery cell; 101. First battery cell body; 102. First tab; 1021. First positive tab; 1022. First negative tab;

[0026] 2. Second battery cell; 201. Second battery cell body; 202. Second tab; 2021. Second positive tab; 2022. Second negative tab;

[0027] 3. Adapter; 301. First surface; 3011. Adapter protrusion; 302. Positive adapter; 303. Negative adapter; 304. First connection portion; 305. Second connection portion; 306. Long fuse hole;

[0028] 4. Pole; 401. Connection end; 402. Step surface;

[0029] 5. Insulating member; 501. Insulating member raised portion;

[0030] 6. Shell. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0032] Currently, the tabs leading out of the battery cells are usually welded to the lower surface of the adapter, resulting in a large required height space between the adapter and the battery cells, resulting in low battery space utilization and affecting the battery energy density. In order to improve the space utilization in the height direction of the battery, the tabs can be bent to the upper surface of the adapter, and the tabs can be welded to the upper surface of the adapter to reduce the required height space between the adapter and the battery cells. However, the upper surface of the adapter also needs to be welded to the pole, especially in dual-cell batteries where the installation space is relatively limited. The end of the tab on the upper surface of the adapter is very close to the welding position of the pole, and the end of the tab can easily be inserted into the welding position between the adapter and the pole. When the pole and the adapter are welded, since the end of the tab is placed between the pole and the adapter, it is easy to cause the pole and the adapter to form a cold weld, affecting the welding quality of the pole and the adapter, and further affecting the flow capacity between the pole and the adapter.

[0033] The following combination Figures 1 to 9 , describing embodiments of the battery and electrical device of the present invention.

[0034] According to an embodiment of the present invention, in one aspect, a battery is provided, comprising: a first cell 1, a second cell 2, an adapter 3, and a terminal 4. The first cell 1 comprises a first cell body 101 and a first tab 102. The first tab 102 extends from the first cell body 101, and includes a root portion connected to the first cell body 101 and an end distal from the first cell body 101. The second cell 2 comprises a second cell body 201 and a second tab 202. The second tab 202 extends from the end of the second cell body 201, and includes a root portion connected to the end of the second cell body 201 and an end distal from the second cell body 201. The end of the first cell 1 extending from the first tab 102 is located on the same side as the end of the second cell 2 extending from the second tab 202, and the polarity of the first tab 102 and the second tab 202 are the same. The first and second tabs 102, 202 of the adapter 3 are at least partially disposed on the upper portion of the first surface 301 of the adapter 3 and are electrically connected to the first surface 301. The first surface 301 is disposed away from the first and second cell bodies 101, 201. The first surface 301 has a pole connection area, part of which is disposed opposite the ends of the first and second tabs 102, 202. Pole 4 is electrically connected to the pole connection area. On the first surface 301, along the width of the battery, the distance between the root of the first and second tabs 102, 202, is a, and the distance between the ends of the first and second tabs 102, 202, is b, satisfying the following conditions: 10 mm ≤ ab ≤ 65 mm.

[0035] This embodiment controls the distance a between the root of the first pole tab 102 and the root of the second pole tab 202, and the distance b between the end of the first pole tab 102 and the end of the second pole tab 202 to ensure the distance between the first pole tab 102 and the pole 4, and the distance between the second pole tab 202 and the pole 4. This ensures that the ends of the first pole tab 102 and the second pole tab 202 are not placed between the pole 4 and the adapter 3, and does not cause a cold weld between the pole 4 and the adapter 3, thereby ensuring the welding quality of the pole 4 and the adapter 3 and further ensuring the overcurrent capacity between the pole 4 and the adapter 3.

[0036] Moreover, the distance a between the root of the first pole ear 102 and the root of the second pole ear 202, and the distance b between the end of the first pole ear 102 and the end of the second pole ear 202 satisfy 10mm≤ab≤65mm. Within the above range, the ends of the first pole ear 102 and the second pole ear 202 are not easily placed in the gap between the pole 4 and the adapter 3, and are not likely to cause a cold weld between the pole 4 and the adapter 3, thereby ensuring the welding quality of the pole 4 and the adapter 3 and the current flow capacity between the pole 4 and the adapter 3. At the same time, the electrical connection area between the first pole ear 102 and the adapter 3 and the electrical connection area between the second pole ear 202 and the adapter 3 will not be too small, thereby ensuring the current flow capacity of the first pole ear 102 and the adapter 3 and the current flow capacity of the second pole ear 202 and the adapter 3. When the battery is fast charged at a high rate, the heat generated by the first pole ear 102 and the second pole ear 202 will not be very large, and the risk of thermal runaway will not easily occur.

[0037] The battery includes a housing 6, which is used to protect the internal structure of the battery and improve the battery's impact resistance and structural stability. The housing 6 includes a cover plate and a shell body. At least one end of the shell body is provided with an opening, and the cover plate blocks the opening to isolate the interior and exterior of the shell 6. The cover plate and the shell body can be fixed by welding, bonding, riveting, etc. A battery cell is provided inside the battery housing 6. The battery cell is the energy storage unit of the battery, and the storage and release of electrical energy are achieved through the electrochemical reaction inside the battery cell (the interaction between the positive electrode material, the negative electrode material and the electrolyte). The material of the shell 6 can be a metal material such as aluminum, aluminum alloy, copper, nickel, stainless steel, carbon steel, etc.

[0038] A battery cell consists of a positive electrode sheet, a negative electrode sheet, and a separator disposed between them, formed by winding or stacking them. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material. The positive electrode current collector can be made of metal materials such as aluminum foil, nickel foil, stainless steel, or a composite foil formed by combining metal and insulating materials. The positive electrode active material includes a main positive electrode active material, a conductive agent, and a binder. The main positive electrode active material includes one or more lithium-containing positive electrode active materials such as lithium iron phosphate, a ternary material containing nickel, cobalt, and manganese, and lithium iron manganese phosphate. Similar to the positive electrode sheet, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material. The negative electrode current collector can be made of metal materials such as copper foil, aluminum foil, stainless steel, or a composite foil formed by combining metal and insulating materials. The negative electrode active material includes a main negative electrode active material, a conductive agent, and a binder. The main negative electrode active material includes one or more negative electrode active materials such as artificial graphite, natural graphite, silicon-carbon, silicon-oxygen, and lithium titanate.

[0039] In this embodiment, two battery cells, namely a first battery cell 1 and a second battery cell 2, are provided inside the battery casing 6 to meet the power demand. The first battery cell 1 includes a first battery cell body 101 and a first pole tab 102. The first battery cell 1 is formed by stacking or winding the positive electrode sheet and the negative electrode sheet to form a winding core, and the current is drawn out through the first pole tab 102. The first battery cell body 101 is the main part of the first battery cell 1. The first battery cell body 101 is formed by stacking or winding the positive electrode sheet, the negative electrode sheet and the separator. The first pole tab 102 is drawn out from the end of the first battery cell body 101, and the first battery cell body 101 is electrically connected to the first pole tab 102. The first pole tab 102 serves as a conductive electrode connecting the first battery cell body 101 to the external circuit for transmitting current. The first pole tab 102 includes a root connected to the first battery cell body 101 and an end away from the first battery cell body 101.

[0040] Similarly, the second battery cell 2 includes a second battery cell body 201 and a second pole tab 202. The second battery cell 2 is formed by stacking or winding the positive electrode sheet and the negative electrode sheet to form a core, and the current is drawn out through the second pole tab 202. The second battery cell body 201 is the main part of the second battery cell 2. The second battery cell body 201 is formed by stacking or winding the positive electrode sheet, the negative electrode sheet and the separator. The second pole tab 202 is drawn out from the end of the second battery cell body 201, and the second battery cell body 201 is electrically connected to the second pole tab 202. The second pole tab 202 serves as a conductive electrode connecting the second battery cell body 201 to the external circuit for transmitting current. The second pole tab 202 includes a root connected to the end of the second battery cell body 201 and an end away from the second battery cell body 201.

[0041] In this embodiment, the end of the first tab 102 of the first cell 1 and the end of the second tab 202 of the second cell 2 are located on the same side, and the polarity of the first tab 102 and the second tab 202 are the same. Figure 2 As shown, the first battery cell 1 and the second battery cell 2 are arranged side by side and close to each other, and the ends of the first battery cell 1 and the second battery cell 2 leading to the tabs are in the same direction, that is, the end of the first battery cell 1 leading to the first tab 102 and the end of the second battery cell 2 leading to the second tab 202 are located on the same side. Figure 2 Taking the perspective as an example, two first tabs 102 are led out from the upper end of the first cell body 101 , and similarly, two second tabs 202 are led out from the upper end of the second cell body 201 , and the first tabs 102 correspond to the second tabs 202 in position to facilitate circuit connection.

[0042] The first electrode tab 102 and the second electrode tab 202 have the same polarity, for example, the first electrode tab 102 and the second electrode tab 202 are both positive electrode tabs, or the first electrode tab 102 and the second electrode tab 202 are both negative electrode tabs. The positive electrode tab and the negative electrode tab can be located on the same side or on different sides.

[0043] It should be noted that the length direction of the battery is along the direction of the large surface of the battery cell, and the width direction of the battery is perpendicular to the large surface of the battery cell. The large surface of the battery cell refers to the side with the largest outer surface area of ​​the battery cell. Figure 1 and Figure 3 As shown, the length direction of the battery is the x direction, the width direction of the battery is the y direction, and the height direction of the battery is the z direction.

[0044] The adapter 3 (also called the adapter plate) is mainly used to realize the current transmission of the battery cell and the battery. One end of the adapter 3 is electrically connected to the pole ear, and the other end is electrically connected to the pole. Specifically, the adapter 3 is used to realize the electrical connection between the first pole ear 102 and the pole 4, and the electrical connection between the second pole ear 202 and the pole 4.

[0045] Typically, the thickness of the adapter 3 is between the thickness of the single tab and the thickness of the pole, to avoid the risk of the tab being welded through when the tab and pole are welded. The first tab 102 and the second tab 202 are welded to the adapter 3 by welding, including ultrasonic, laser, or resistance welding.

[0046] The adapter 3 is generally a sheet-like structure, and is disposed between the first cell body 101 and the pole 4, and between the second cell body 201 and the pole 4. Specifically, the adapter 3 is disposed near the end of the first cell body 101 where the first pole tab 102 is led out, and near the end of the second cell body 201 where the second pole tab 202 is led out. The adapter 3 has a first surface 301 and a second surface, the first surface 301 and the second surface are disposed opposite to each other, the second surface is disposed toward the first cell body 101 and the second cell body 201, and the first surface 301 is disposed away from the first cell body 101 and the second cell body 201. When the battery is vertically ( Figure 1 When setting the z direction, Figure 1-Figure 2 As shown, at this time, the first surface 301 is the upper surface of the adapter 3, and the second surface is the lower surface of the adapter 3. The material of the adapter 3 can be aluminum, aluminum alloy, copper-aluminum composite material, etc.

[0047] In this embodiment, the first pole tab 102 is led out from the end of the first battery cell body 101, and at least a portion of the first pole tab 102 is wound around the first surface 301 of the adapter 3, so that at least a portion of the first pole tab 102 is arranged on the upper part of the first surface 301 and electrically connected to the first surface 301. The first surface 301 has a first pole tab connection area that is electrically connected to the first pole tab 102. Similarly, the second pole tab 202 is led out from the end of the second battery cell body 201, and at least a portion of the second pole tab 202 is wound around the first surface 301 of the adapter 3, so that at least a portion of the second pole tab 202 is arranged on the upper part of the first surface 301 and electrically connected to the first surface 301. The first surface 301 has a second pole tab connection area that is electrically connected to the second pole tab 202. With this arrangement, the distance between the adapter 3 and the first battery cell body 101 and the second battery cell body 201 is smaller, which can reduce the overall height of the battery (along the Figure 1 In this embodiment, the electrical connection between the first tab 102 and the first surface 301 and the electrical connection between the second tab 202 and the first surface 301 are both welding.

[0048] The pole 4 is a core component for connecting the internal and external circuits of the battery. The pole 4 is arranged near the first surface 301 of the adapter 3. Specifically, the pole 4 is located on one side of the adapter 3, and the first battery cell body 1 and the second battery cell body 201 are located on the other side of the adapter 3. The pole 4 is also electrically connected to the first surface 301. The first surface 301 has a pole connection area that is electrically connected to the pole 4. The pole connection area is staggered with the first pole lug connection area and the second pole lug connection area. Part of the pole connection area is arranged relative to the end of the first pole lug 102 and the end of the second pole lug 202. In this embodiment, the pole 4 is electrically connected to the first surface 301 by welding. Along the width direction of the battery, the electrical connection position (pole connection area) of the pole 4 and the first surface 301 is arranged between the first pole lug 102 and the second pole lug 202. The material of the pole 4 can be aluminum, aluminum alloy, copper-aluminum composite material, etc.

[0049] like Figure 3 As shown, the end corners of the first tab 102 and the second tab 202 on the first surface 301 are partially cut off to Figure 3Taking the first and second tabs 102 and 202 on the left side as an example, the distance between the root of the first tab 102 and the root of the second tab 202 is a, and the distance between the end of the first tab 102 and the end of the second tab 202 is b, and the distances a and b satisfy 10mm≤ab≤65mm. Within the above range, the ends of the first and second tabs 102 and 202 are not likely to be placed in the gap between the pole 4 and the adapter 3, which is unlikely to cause a poor solder joint between the pole 4 and the adapter 3, ensuring the welding quality of the pole 4 and the adapter 3 and the flow capacity between the pole 4 and the adapter 3. At the same time, the electrical connection area between the first and second tabs 102 and 202 and the adapter 3 is not too small, which can ensure the flow capacity of the first and second tabs 102 and the adapter 3, and the flow capacity of the second tab 202 and the adapter 3. When the battery is fast charged at a high rate, the first and second tabs 102 and 202 do not generate much heat, and are unlikely to cause the risk of thermal runaway.

[0050] If the value of "ab" is too small, the electrical connection area (welding area) between the first pole lug 102 and the adapter 3, as well as the electrical connection area (welding area) between the second pole lug 202 and the adapter 3 are too small, affecting the overcurrent capacity between the first pole lug 102 and the adapter 3, as well as the overcurrent capacity between the second pole lug 202 and the adapter 3, so that the overcurrent capacity of the first pole lug 102 and the second pole lug 202 cannot meet the overcurrent requirement. When the battery is fast-charged at a high rate, the first pole lug 102 and the second pole lug 202 generate a lot of heat, and the battery is exposed to safety risks such as thermal runaway.

[0051] However, if the value of "ab" is too large, the distance between the first pole lug 102 and the pole 4, as well as the distance between the second pole lug 202 and the pole 4 are still too close, and the ends of the first pole lug 102 and the second pole lug 202 are still easily inserted between the pole 4 and the adapter 3. When the pole 4 and the adapter 3 are welded, the ends of the first pole lug 102 and the second pole lug 202 are inserted into the gap between the pole 4 and the adapter 3, resulting in a cold weld between the pole 4 and the adapter 3, resulting in poor welding quality between the pole 4 and the adapter 3, affecting the current carrying capacity between the pole 4 and the adapter 3.

[0052] In this embodiment, the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202, and the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 satisfy 0mm≤ab≤65mm. Within the above range, the value of "ab" is neither too small nor too large. The ends of the first electrode tab 102 and the second electrode tab 202 are not easily placed in the gap between the electrode 4 and the adapter 3, which is unlikely to cause a poor solder joint between the electrode 4 and the adapter 3, thereby ensuring the welding quality of the electrode 4 and the adapter 3 and the current flow capacity between the electrode 4 and the adapter 3. At the same time, the electrical connection area between the first electrode tab 102 and the adapter 3 and the electrical connection area between the second electrode tab 202 and the adapter 3 are not too small, which can ensure the current flow capacity of the first electrode tab 102 and the adapter 3 and the current flow capacity of the second electrode tab 202 and the adapter 3. When the battery is fast charged at a high rate, the first electrode tab 102 and the second electrode tab 202 do not generate much heat, and are unlikely to cause the risk of thermal runaway.

[0053] For example, the value of "ab" can be 0mm, 5mm, 10mm, 16mm, 23mm, 35mm, 42mm, 58mm, 65mm, etc.

[0054] Furthermore, the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202 satisfies: 30 mm ≤ a ≤ 80 mm.

[0055] The distance a between the root of the first pole ear 102 and the root of the second pole ear 202 should not be too small or too large. If the distance a between the root of the first pole ear 102 and the root of the second pole ear 202 is too small, the ends of the first pole ear 102 and the second pole ear 202 will be inserted into the gap between the pole 4 and the adapter 3, so that the pole 4 and the adapter 3 will form a cold weld, resulting in poor welding quality between the pole 4 and the adapter 3, affecting the flow capacity between the pole 4 and the adapter 3, and the electrical connection area between the first pole ear 102 and the adapter 3, as well as the electrical connection area between the second pole ear 202 and the adapter 3 are relatively small, and the flow capacity of the first pole ear 102 and the adapter 3, as well as the flow capacity of the second pole ear 202 and the adapter 3 cannot be guaranteed. When the battery is fast charged at a high rate, the first pole ear 102 and the second pole ear 202 generate a lot of heat, which is prone to the risk of thermal runaway. If the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202 is too large, the transmission path of the battery current will be too long, resulting in excessive internal resistance during current transmission, high heat generation, poor battery space utilization, and low battery energy density.

[0056] In this embodiment, the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202 is in the range of 30 mm ≤ a ≤ 80 mm. Within this range, the ends of the first electrode tab 102 and the second electrode tab 202 are not easily placed in the gap between the electrode 4 and the adapter 3, which is unlikely to cause a cold weld between the electrode 4 and the adapter 3, thereby ensuring the welding quality of the electrode 4 and the adapter 3 and the current carrying capacity between the electrode 4 and the adapter 3. In addition, the electrical connection area between the first electrode tab 102, the second electrode tab 202 and the adapter 3 is neither too small nor too large, thereby ensuring the current carrying capacity between the first electrode tab 102 and the adapter 3 and the current carrying capacity between the second electrode tab 202 and the adapter 3. At the same time, the battery current transmission path is not too long, the internal resistance during current transmission is not too large, and the heat generation is low, which can reduce the risk of thermal runaway and improve the battery's space utilization and energy density.

[0057] For example, the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202 may be 30 mm, 41 mm, 56 mm, 64 mm, 71 mm, 80 mm, etc.

[0058] Furthermore, a distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 satisfies: 15 mm ≤ b ≤ 30 mm.

[0059] The distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 should not be too small or too large. If the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 is too small, the ends of the first electrode tab 102 and the second electrode tab 202 are likely to be placed in the gap between the electrode post 4 and the adapter 3, which may easily cause a poor solder joint between the electrode post 4 and the adapter 3, and the welding quality between the electrode post 4 and the adapter 3 cannot be ensured, affecting the flow capacity between the electrode post 4 and the adapter 3. If the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 is too large, the electrical connection area between the first electrode tab 102, the second electrode tab 202 and the adapter 3 is small, and the flow capacity of the first electrode tab 102 and the adapter 3 and the flow capacity of the second electrode tab 202 and the adapter 3 cannot be guaranteed. When the battery is fast charged at a high rate, the first electrode tab 102 and the second electrode tab 202 generate a lot of heat, which may easily lead to the risk of thermal runaway.

[0060] In this embodiment, the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 is in the range of 15 mm ≤ b ≤ 30 mm. Within this range, the ends of the first electrode tab 102 and the second electrode tab 202 are not easily placed in the gap between the electrode 4 and the adapter 3, which is unlikely to cause a cold weld between the electrode 4 and the adapter 3. This ensures the welding quality of the electrode 4 and the adapter 3 and the flow capacity between the electrode 4 and the adapter 3. At the same time, the electrical connection area between the first electrode tab 102, the second electrode tab 202 and the adapter 3 is neither too small nor too large, ensuring the flow capacity of the first electrode tab 102 and the adapter 3, as well as the flow capacity of the second electrode tab 202 and the adapter 3. This generates less heat and reduces the risk of thermal runaway.

[0061] For example, the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 may be 15 mm, 18 mm, 22 mm, 27 mm, 30 mm, etc.

[0062] Furthermore, the distance between the root of the first electrode tab 102 and the end of the first electrode tab 102 is c1, and the distance between the root of the second electrode tab 202 and the end of the second electrode tab 202 is c2, which satisfies: 0.8≤c1 / c2≤1.2.

[0063] like Figure 3 As shown, the first battery cell 1 and the second battery cell 2 are arranged in parallel and in contact with each other. On the first battery cell 1, the distance between the root of the first pole tab 102 and the end of the first pole tab 102 is c1; on the second battery cell 2, the distance between the root of the second pole tab 202 and the end of the second pole tab 202 is c2, and it satisfies: 0.8≤c1 / c2≤1.2, that is, the ratio of 1 to c2 is close to 1, so that the width (dimension along the width direction of the battery) of the first pole tab 102 and the second pole tab 202 are close, thereby ensuring that the distance between the first pole tab 102 and the pole 4, and the distance between the second pole tab 202 and the pole 4 are uniform, avoiding the distance between the first pole tab 102 and the pole 4 being too close, and avoiding the distance between the second pole tab 202 and the pole 4 being too close, thereby ensuring the welding quality and overcurrent capacity of the pole 4 and the adapter 3.

[0064] For example, the value of "c1 / c2" can be 0.8, 0.9, 1, 1.1, 1.2, etc.

[0065] Furthermore, the adapter 3 includes a first connecting portion 304 and a second connecting portion 305, the first pole tab 102 is at least partially electrically connected to the first surface 301 of the first connecting portion 304, and the second pole tab 202 is at least partially electrically connected to the first surface 301 of the second connecting portion 305; along the width direction of the battery, the first connecting portion 304 and the second connecting portion 305 are spaced apart.

[0066] like Figure 3 、 8As shown in FIG-9 , the adapter 3 includes a positive adapter 302 and a negative adapter 303. The positive adapter 302 is electrically connected to the positive electrode tab, and the negative adapter 303 is electrically connected to the negative electrode tab. The structures of the positive adapter 302 and the negative adapter 303 are basically the same.

[0067] In this embodiment, the adapter 3 is a U-shaped adapter, the pole welding area of ​​the adapter 3 is set in the center, and the extensions on both sides of the adapter 3 are electrically connected to the first pole tab 102 and the second pole tab 202 respectively. Specifically, taking the positive pole adapter 302 as an example, Figure 8-Figure 9 As shown, the positive electrode adapter 302 has a first connecting portion 304 and a second connecting portion 305 . The first connecting portion 304 and the second connecting portion 305 are symmetrically arranged relative to the center line of the positive electrode adapter 302 , and a U-shaped opening is formed between the first connecting portion 304 and the second connecting portion 305 .

[0068] The first connecting portion 304 has a first surface 301 on a side facing away from the first cell body 101, and the first tab 102 is at least partially electrically connected to the first surface 301 of the first connecting portion 304. Similarly, the second connecting portion 305 has a first surface 301 on a side facing away from the second cell body 201, and the second tab 202 is at least partially electrically connected to the first surface 301 of the second connecting portion 305.

[0069] Along the width direction of the battery, the first connecting part 304 and the second connecting part 305 are spaced apart. A convergence space is formed by the spacing between the two, so that the first pole ear 102 and the second pole ear 202 can be partially bent and accommodated in the convergence space, avoiding the first pole ear 102 and the second pole ear 202 from overlapping with the pole 4, affecting the welding yield of the pole 4 and the adapter 3.

[0070] Furthermore, the end of the first electrode tab 102 extends beyond the inner edge of the first connecting portion 304 ; and / or the end of the second electrode tab 202 extends beyond the inner edge of the second connecting portion 305 .

[0071] The inner edge of the first connecting portion 304 is one side of the U-shaped opening. When the first tab 102 is at least partially electrically connected to the first connecting portion 304, the end of the first tab 102 extends beyond the inner edge of the first connecting portion 304. This arrangement ensures a sufficient electrical connection area (welding area) between the first tab 102 and the first connecting portion 304, ensuring that all first tabs 102 are welded to the first connecting portion 304, thereby ensuring the current flow capacity between the first tab 102 and the adapter 3.

[0072] Similarly, the inner edge of the second connecting portion 305 is the other side of the U-shaped opening. When the second electrode tab 202 is at least partially electrically connected to the first surface 301 of the second connecting portion 305, the end of the second electrode tab 202 extends beyond the inner edge of the second connecting portion 305. This arrangement ensures a sufficient electrical connection area (welding area) between the second electrode tab 202 and the second connecting portion 305, allowing all second electrode tabs 202 to be welded to the second connecting portion 305, thereby ensuring the current flow capacity between the second electrode tab 202 and the second connecting portion 305.

[0073] It should be noted that after the first pole tab 102 and the second pole tab 202 are wound around the first surface 301, a staggered structure will be formed. The shortest part of the first pole tab 102 should be at least flush with the inner edge of the first connecting portion 304. Similarly, the shortest part of the second pole tab 202 should be at least flush with the inner edge of the second connecting portion 305.

[0074] In other embodiments, depending on different configuration requirements, only the end of the first tab 102 may extend beyond the inner edge of the first connecting portion 304 , or only the end of the second tab 202 may extend beyond the inner edge of the second connecting portion 305 .

[0075] Furthermore, the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202 , and the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 satisfy: 10 mm ≤ ab ≤ 55 mm.

[0076] In this embodiment, since the end of the first electrode tab 102 extends beyond the inner edge of the first connecting portion 304, and the end of the second electrode tab 202 extends beyond the inner edge of the second connecting portion 305, the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202, and the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 satisfy the following conditions: 10 mm ≤ ab ≤ 55 mm.

[0077] Since the end of the first pole ear 102 exceeds the inner edge of the first connecting portion 304, and the end of the second pole ear 202 exceeds the inner edge of the second connecting portion 305, the first pole ear 102 and the second pole ear 202 are both close to the pole 4. It is necessary to limit the range of "ab" to avoid the first pole ear 102 and the second pole ear 202 being too close to the pole 4, to ensure that the ends of the first pole ear 102 and the second pole ear 202 are not easily placed in the gap between the pole 4 and the adapter 3, and not easily cause poor welding between the pole 4 and the adapter 3, to ensure the welding quality of the pole 4 and the adapter 3, and to ensure the overcurrent capacity between the pole 4 and the adapter 3.

[0078] For example, the value of "ab" can be 10mm, 24mm, 37mm, 43mm, 55mm, etc.

[0079] Furthermore, along the width direction of the battery, a ratio of a spacing distance d between the first connecting portion 304 and the second connecting portion 305 to a width e of the adapter 3 is 0.2≤d / e≤0.8.

[0080] If the ratio of "d / e" is too small, the convergence space of the first pole ear 102 and the second pole ear 202 will be small, and the setting of the first pole ear 102 and the second pole ear 202 will be too large. If the ratio of "d / e" is too large, the area of ​​the first connecting part 304 and the second connecting part 305 will become smaller, affecting the current transmission between the first pole ear 102 and the pole 4, and between the second pole ear 202 and the pole 4, resulting in a slower current transmission rate of the pole ears.

[0081] like Figure 8 As shown, in this embodiment, the ratio range of "d / e" is 0.2≤d / e≤0.8. Within the above range, the convergence space of the first pole tab 102 and the second pole tab 202 will not be too small, and the area of ​​the first connecting part 304 and the second connecting part 305 can be guaranteed to be sufficient to ensure the transmission rate of the pole tab current.

[0082] For example, the ratio of "d / e" can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0083] In this embodiment, the distance d between the first connecting portion 304 and the second connecting portion 305 is in the range of 5 mm ≤ d ≤ 30 mm. For example, the distance d can be 5 mm, 12 mm, 25 mm, etc. The width e of the adapter 3 is in the range of 15 mm ≤ e ≤ 70 mm. For example, the width e can be 15 mm, 22 mm, 35 mm, 46 mm, 55 mm, 67 mm, 70 mm, etc.

[0084] Furthermore, the first pole tab 102 is electrically connected to the adapter 3 to form a first pole tab connection area, and the second pole tab 202 is electrically connected to the adapter 3 to form a second pole tab connection area; the adapter 3 is provided with a fuse structure, and the fuse structure is provided between the first pole tab connection area and the pole connection area, and between the second pole tab connection area and the pole connection area.

[0085] The first tab 102 is electrically connected to the adapter 3 to form a first tab connection area, and the second tab 202 is electrically connected to the adapter 3 to form a second tab connection area. In this embodiment, a fuse structure is also provided on the adapter 3, and the fuse structure is provided between the first tab connection area and the pole connection area, and between the second tab connection area and the pole connection area. The main function of the fuse structure is overcurrent protection. When the battery system exceeds the design threshold due to short circuit, overcharge, overdischarge or external fault, the battery generates a large amount of heat, and the fuse structure will quickly melt, cutting off the circuit, preventing the battery pack from causing thermal runaway or permanent damage due to continuous high current. Specifically, the fuse structure forms a weak area by thinning or providing a notch or through hole, so that when the battery is abnormal during the charging and discharging process, the fuse structure can quickly generate heat and concentrate it, further disconnecting the current between the tab and the pole, that is, disconnecting the current between the cell output end and the battery output end.

[0086] Furthermore, the fuse structure includes at least two fuse structures, and the at least two fuse structures are respectively disposed on the first connecting portion 304 and the second connecting portion 305 .

[0087] like Figure 8-Figure 9 As shown, in this embodiment, the fuse structure is a long fuse hole 306. There are two long fuse holes 306, namely one on the first connecting portion 304 and one on the second connecting portion 305. This ensures that the current flow of the two battery cells is completely disconnected when the current is abnormal. When the current is too high, the adjacent parts of the long fuse hole 306 fuse, thereby severing the electrical connection between the tab and the terminal 4, protecting the safety of the battery system.

[0088] Furthermore, the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202 , and the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 satisfy: 18 mm ≤ ab ≤ 65 mm.

[0089] In this embodiment, since a fuse structure is provided on the adapter 3, the area on the adapter 3 that can be electrically connected to the first pole lug 102 and the second pole lug 202 is reduced. Therefore, the range of "ab" needs to be limited to avoid the first pole lug 102 and the pole 4 from overlapping too closely, and the second pole lug 202 and the pole 4 from overlapping too closely, to ensure that the ends of the first pole lug 102 and the second pole lug 202 are not easily placed in the gap between the pole 4 and the adapter 3, to ensure the welding quality of the pole 4 and the adapter 3, to ensure the overcurrent capacity between the pole 4 and the adapter 3, and to ensure that the fuse structure is effective. At the same time, it is ensured that the first pole lug 102 and the adapter 3 have sufficient electrical connection area to ensure the overcurrent capacity. Similarly, it is ensured that the second pole lug 202 and the adapter 3 have sufficient electrical connection area to ensure the overcurrent capacity.

[0090] For example, the value of "ab" can be 18mm, 28mm, 33mm, 46mm, 52mm, 65mm, etc.

[0091] Furthermore, the adapter 3 includes a positive adapter 302 and a negative adapter 303, and the fuse structure is provided on the positive adapter 302; the first pole ear 102 includes a first positive pole ear 1021 and a first negative pole ear 1022, and the second pole ear 202 includes a second positive pole ear 2021 and a second negative pole ear 2022, the first positive pole ear 1021 and the second positive pole ear 2021 are electrically connected to the positive adapter 302, and the first negative pole ear 1022 and the second negative pole ear 2022 are electrically connected to the negative adapter 30 3. On the first surface 301 of the positive electrode adapter 302, along the width direction of the battery, the distance between the root of the first positive electrode tab 1021 and the root of the second positive electrode tab 2021 is a1, the distance between the end of the first positive electrode tab 1021 and the end of the second positive electrode tab 2021 is b1, the distance between the root of the first negative electrode tab 1022 and the root of the second negative electrode tab 2022 is a2, and the distance between the end of the first negative electrode tab 1022 and the end of the second negative electrode tab 2022 is b2, satisfying: a1-b1<a2-b2.

[0092] The battery of this embodiment is a dual-cell battery, each cell having a positive electrode tab and a negative electrode tab. Specifically, the first tab 102 of the first cell 1 includes a first positive electrode tab 1021 and a first negative electrode tab 1022, and the second tab 202 of the second cell 2 includes a second positive electrode tab 2021 and a second negative electrode tab 2022.

[0093] Adapter 3 includes a positive adapter 302 and a negative adapter 303. Positive adapter 302 is electrically connected to the positive tabs of the two battery cells, while negative adapter 303 is electrically connected to the negative tabs of the two battery cells. Specifically, first positive tab 1021 and second positive tab 2021 are electrically connected to positive adapter 302, while first negative tab 1022 and second negative tab 2022 are electrically connected to negative adapter 303. The fuse structure of adapter 3 is also located on positive adapter 302.

[0094] like Figure 7As shown, on the first surface 301 of the positive electrode adapter 302, along the width direction of the battery, the distance between the root of the first positive electrode tab 1021 and the root of the second positive electrode tab 2021 is a1, and the distance between the end of the first positive electrode tab 1021 and the end of the second positive electrode tab 2021 is b1, while the distance between the root of the first negative electrode tab 1022 and the root of the second negative electrode tab 2022 is a2, and the distance between the end of the first negative electrode tab 1022 and the end of the second negative electrode tab 2022 is b2, satisfying: a1-b1<a2-b2. This is because the fuse structure is provided on the positive electrode adapter 302, while the fuse structure is not provided on the negative electrode adapter 303, and the melting point of the positive electrode adapter 302 is lower. When the battery generates too much heat, the positive electrode adapter 302 will melt first to avoid thermal runaway of the battery. Therefore, on the positive electrode adapter 302, the electrical connection area between the positive electrode tabs (the first positive electrode tab 1021 and the second positive electrode tab 2021) and the positive electrode adapter 302 is smaller, that is, a1-b1<a2-b2.

[0095] Furthermore, the pole connection area is provided on the first surface 301 , and the pole connection area is provided with an adapter protrusion 3011 protruding toward the pole 4 .

[0096] In order to further improve the structural reliability, the first pole tab 102 and the second pole tab 202 are kept at a certain distance from the pole 4, so that the first pole tab 102 and the pole 4 will not overlap, and the second pole tab 202 and the pole 4 will not overlap. The first surface 301 is provided with a pole connection area. When the pole 4 is welded to the first surface 301, the pole 4 is welded to the pole connection area. In addition, the pole connection area is provided with an adapter protrusion 3011, such as Figure 5 As shown, the adapter protrusion 3011 protrudes toward the arrangement direction of the pole 4. Optionally, the adapter protrusion 3011 transitions smoothly with other parts of the first surface 301.

[0097] When the battery is arranged in the vertical direction, the height of the adapter protrusion 3011 is higher than the height of other parts of the first surface 301, and the pole 4 is electrically connected to the adapter protrusion 3011, and the first pole ear 102 is electrically connected to other positions of the first surface 301, thereby increasing the distance between the first pole ear 102, the second pole ear 202 and the pole 4 in the height direction, increasing the setting space of the first pole ear 102, the second pole ear 202 on the first surface 301 of the adapter 3, further ensuring that the first pole ear 102, the second pole ear 202 maintains a sufficient distance from the pole 4, avoiding the first pole ear 102, the second pole ear 202 from overlapping with the pole 4, so that the first pole ear 102, the second pole ear 202 will not be inserted into the gap between the pole 4 and the adapter 3, and will not cause the problem of cold welding between the pole 4 and the adapter 3, ensuring the welding quality of the pole 4 and the adapter 3, and ensuring the current capacity between the pole 4 and the adapter 3. Moreover, the position where the pole 4 is electrically connected to the adapter 3 should be in planar contact to facilitate welding of the pole 4 and the adapter 3 and to ensure the welding quality of the pole 4 and the adapter 3. By providing the adapter protrusion 3011 in the pole connection area of ​​the adapter 3, only the flatness of the position of the adapter protrusion 3011 can be ensured to reduce the processing difficulty, thereby ensuring the welding quality of the pole 4 and the adapter 3.

[0098] Furthermore, the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202 , and the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 satisfy: 20 mm ≤ ab ≤ 55 mm.

[0099] The pole connection area is provided with an adapter protrusion 3011 protruding toward the pole 4. At this time, the range of "ab" is limited to avoid the first pole ear 102 and the pole 4 from overlapping too closely, and the second pole ear 202 and the pole 4 from overlapping too closely, ensuring that the ends of the first pole ear 102 and the second pole ear 202 are not easily placed in the gap between the pole 4 and the adapter 3, ensuring the welding quality of the pole 4 and the adapter 3, ensuring the overcurrent capacity between the pole 4 and the adapter 3, and ensuring that the fuse structure is effective, while ensuring that the first pole ear 102 and the adapter 3 have sufficient electrical connection area to ensure the overcurrent capacity. Similarly, ensuring that the second pole ear 202 and the adapter 3 have sufficient electrical connection area to ensure the overcurrent capacity.

[0100] For example, the value of "ab" can be 20mm, 34mm, 43mm, 51mm, 55mm, etc.

[0101] Furthermore, the height of the adapter protrusion 3011 protruding toward the pole 4 ranges from 0.3 mm to 1 mm.

[0102] If the height of the adapter protrusion 3011 protruding toward the pole 4 is too small, the first pole ear 102, the second pole ear 202 and the pole 4 are easily overlapped, affecting the welding quality of the pole 4 and the adapter 3. If the height of the adapter protrusion 3011 protruding toward the pole 4 is too large, the current transmission path between the battery cell and the pole 4 is longer and the transmission rate is slower.

[0103] In this embodiment, the height of the adapter protrusion 3011 protruding toward the electrode 4 ranges from 0.3 mm to 1 mm. Within this range, the height of the adapter protrusion 3011 protruding toward the electrode 4 is neither too large nor too small, thereby preventing the first and second electrode tabs 102, 202 from overlapping the electrode 4. This ensures the transmission rate between the battery cell and the electrode 4.

[0104] For example, the height of the adapter protrusion 3011 protruding toward the pole 4 may be 0.3 mm, 0.5 mm, 0.7 mm, 1 mm, etc.

[0105] Furthermore, the outer periphery of the adapter protrusion 3011 close to the end of the first electrode tab 102 or the end of the second electrode tab 202 is arranged beyond the outer periphery of the bottom surface of the electrode 4 .

[0106] Through the above-mentioned arrangement, the distance between the end of the first pole tab 102 and the pole 4 can be further increased, as well as the distance between the end of the second pole tab 202 and the pole 4 can be increased, thereby preventing the end of the first pole tab 102 or the end of the second pole tab 202 from being inserted between the pole 4 and the adapter 3, thereby ensuring the welding quality of the pole 4 and the adapter 3.

[0107] Furthermore, the top surface area of ​​the protruding portion 3011 of the adapter is S1, and the bottom surface area of ​​the pole 4 is S2, which satisfies: 1.1≤s1 / s2≤3.

[0108] If the ratio of "s1 / s2" is too small, the welding area between the adapter protrusion 3011 and the pole 4 is too small, which is not conducive to the flow of current between the two, affects the transmission efficiency, and is prone to cause local overheating and other problems; if the ratio of "s1 / s2" is too large, the area of ​​the adapter protrusion 3011 is too large, resulting in the welding area between the first pole ear 102 and the adapter 3, and the welding area between the second pole ear 202 and the adapter 3 being too small, affecting the overall current transmission.

[0109] In this embodiment, the ratio range of "s1 / s2" is 1.1≤s1 / s2≤3. Within the above ratio range, the welding area between the adapter protrusion 3011 and the pole 4 is moderate, which can ensure the flow capacity and transmission efficiency between the adapter protrusion 3011 and the pole 4, avoid local overheating, and improve the utilization rate of the internal space of the battery.

[0110] For example, the ratio of "s1 / s2" can be 1.1, 1.3, 1.6, 2.5, 3, etc.

[0111] In this embodiment, the top surface area S1 of the adapter protrusion 3011 is in the range of 50 mm 2 ≤s1≤500mm 2 For example, the top surface area S1 of the adapter protrusion 3011 can be 50mm 2 , 120mm 2 , 260mm 2 , 330mm 2 , 450mm 2 , 500mm 2 The value range of the bottom area S2 of the pole 4 is 40mm 2 ≤s2≤300mm 2 For example, the bottom area S2 of the pole 4 can be 40mm 2 , 130mm 2 , 260mm 2 , 300mm 2 wait.

[0112] Furthermore, the distance a between the root of the first electrode tab 102 and the root of the second electrode tab 202 , and the distance b between the end of the first electrode tab 102 and the end of the second electrode tab 202 satisfy: 10 mm ≤ ab ≤ 50 mm.

[0113] The adapter protrusion 3011 extends beyond the outer periphery of the bottom surface of the terminal 4, reducing the risk of overlap between the first and second terminal tabs 102, 202, and the terminal 4, and preventing the first and second terminal tabs 102, 202 from interfering with the welding of the terminal 4 and the adapter 3. At this time, the range of "ab" is limited to better ensure the overall overcurrent capacity of the battery and avoid the terminal welding area being too small, which would affect the current transfer rate between the battery cell and the terminal 4.

[0114] For example, the value of "ab" can be 10mm, 25mm, 36mm, 48mm, 50mm, etc.

[0115] In other embodiments, the adapter protrusion 3011 may be arranged near the periphery of the end of the first pole lug 102 or the end of the second pole lug 202 without exceeding the periphery of the bottom surface of the pole 4. At this time, the top surface area S1 of the adapter protrusion 3011 is less than or equal to the bottom surface area S2 of the pole 4, so as to further increase the distance between the end of the first pole lug 102 and the bottom surface of the pole 4, or increase the distance between the end of the second pole lug 202 and the bottom surface of the pole 4, to avoid the pole lug being inserted between the pole 4 and the adapter 3, thereby ensuring the welding quality of the pole 4 and the adapter 3.

[0116] At this time, the top surface area S1 of the adapter protrusion 3011 and the bottom surface area S2 of the pole 4 satisfy: 0.2≤s1 / s2≤0.9, and the ratio of "s1 / s2" can be 0.2, 0.4, 0.5, 0.7, 0.9, etc.

[0117] At this point, the risk of overlap between the pole 4 and the first and second pole tabs 102, 202 increases. Furthermore, the area of ​​the adapter protrusion 3011 of the adapter 3 is smaller than the cross-sectional area of ​​the pole 4, creating a bottleneck in the current flow between the two and slowing the current transmission rate. In this case, the distance a between the root of the first pole tab 102 and the root of the second pole tab 202, and the distance b between the end of the first pole tab 102 and the end of the second pole tab 202, satisfy the following conditions: 15mm≤ab≤55mm. By limiting the range of "ab," controlling this range improves the battery's overall current capacity, ensures the welding yield of the pole 4 and adapter 3, and avoids risks such as cold or poor welding.

[0118] For example, the value of "ab" can be 15mm, 21mm, 37mm, 49mm, 55mm, etc.

[0119] Furthermore, the battery further includes a shell 6 , the shell 6 is provided with a through hole, and the adapter protrusion 3011 is at least partially disposed in the through hole.

[0120] The housing 6 is provided with a through hole for accommodating at least a portion of the terminal 4 to facilitate outward current output. The adapter protrusion 3011 is at least partially disposed within the through hole, thereby achieving a compact structure and improving the utilization of the internal space of the battery. For example, the adapter protrusion 3011 may be partially or entirely disposed within the through hole.

[0121] This arrangement reduces the risk of overlap between the first and second tabs 102, 202, and the terminal 4, ensuring the welding yield between the terminal 4 and the adapter 3. At this point, the distance a between the base of the first and second tabs 102, 202, and the distance b between the ends of the first and second tabs 102, 202, satisfy the following conditions: 23 mm ≤ ab ≤ 65 mm. This narrowing of the range of "ab" shortens the battery current transmission path and improves the battery's charge and discharge rates.

[0122] For example, the value of "ab" can be 23mm, 35mm, 42mm, 58mm, 65mm, etc.

[0123] Furthermore, the pole 4 has a connection end 401 electrically connected to the first surface 301 . The edge of the connection end 401 is formed with a step structure, and the step structure is farther away from the first surface 301 than other parts of the connection end 401 .

[0124] The pole 4 is electrically connected to the first surface 301 and has a connection end 401. The connection end 401 is disposed toward the first surface 301 and is electrically connected to the first surface 301 via the connection end 401. In this embodiment, a stepped structure is formed at the edge of the connection end 401. The stepped structure is further away from the first surface 301 than other portions of the connection end 401.

[0125] like Figure 5-Figure 6 As shown, in this embodiment, the step structure includes a step surface 402. The step surface 402 is formed by forming a notch at the edge of the connection end 401. Optionally, the notch is provided along the edge of the pole connection end 401. The provision of the notch reduces the size of the original end face of the connection end 401. The top surface of the notch forms the step surface 402, which is arranged parallel to the end face of the connection end 401. In this case, compared with the end face of the connection end 401, the step surface 402 is farther from the first surface 301.

[0126] By setting up this step structure, the end face size of the connecting end 401 is reduced, the distance between the first pole ear 102 and the pole 4, and the distance between the second pole ear 202 and the pole 4 are further increased, the structural reliability is improved, and it is further ensured that the first pole ear 102 and the second pole ear 202 are not easily placed between the pole 4 and the adapter 3. When the pole 4 and the adapter 3 are welded, the first pole ear 102 and the second pole ear 202 will not be inserted into the gap between the pole 4 and the adapter 3, and the problem of poor welding between the pole 4 and the adapter 3 will not be caused, thereby ensuring the welding quality of the pole 4 and the adapter 3 and the overcurrent capacity between the pole 4 and the adapter 3. It can also avoid the first pole ear 102, the second pole ear 202 from overlapping with the pole 4, prevent the failure of the fuse structure of the adapter 3, ensure that the fuse structure can play a role, avoid thermal runaway of the battery, and reduce safety risks.

[0127] Furthermore, the battery also includes an insulating member 5, which is arranged on the side of the first pole lug 102 and the second pole lug 202 facing away from the adapter 3. The position where the first pole lug 102 and the second pole lug 202 are electrically connected to the adapter 3 is the electrical connection area. The insulating member 5 is provided with an insulating member protrusion 501 at the position corresponding to the electrical connection area of ​​the first pole lug 102 and the position of the electrical connection area of ​​the second pole lug 202. The insulating member protrusion 501 protrudes in a direction away from the first pole lug 102 and the second pole lug 202.

[0128] like Figure 5-Figure 6As shown, the battery further includes an insulating member 5, which is disposed on the side of the first and second tabs 102, 202 facing away from the adapter 3. When the battery is positioned vertically, the insulating member 5 is disposed above the first and second tabs 102, 202. The insulating member 5 is primarily used to isolate the tabs from direct contact with the battery cover to prevent the risk of short circuits. The insulating member 5 is made of an insulating material, such as plastic.

[0129] The position on the first pole tab 102 that is electrically connected to the adapter 3 is the electrical connection area. Similarly, the position on the second pole tab 202 that is electrically connected to the adapter 3 is the electrical connection area. The insulating member 5 is provided with an insulating member protrusion 501 at the position corresponding to the electrical connection area of ​​the first pole tab 102 and the position corresponding to the electrical connection area of ​​the second pole tab 202. The insulating member protrusion 501 protrudes in a direction away from the first pole tab 102 and the second pole tab 202. The first pole lug 102 and the second pole lug 202 located on the first surface 301 inevitably have some curled parts. By setting the insulating member protrusion 501, more setting space can be provided for the first pole lug 102 and the second pole lug 202 in the height direction of the battery, thereby avoiding the insulating member 5 squeezing the first pole lug 102 and the second pole lug 202 in the height direction of the battery, which causes the ends of the first pole lug 102 and the second pole lug 202 to be closer to the pole 4, thereby further ensuring that the ends of the first pole lug 102 and the second pole lug 202 will not be placed between the pole 4 and the adapter 3, and will not cause the pole 4 and the adapter 3 to form a cold weld, thereby ensuring the welding quality of the pole 4 and the adapter 3, and further ensuring the overcurrent capacity between the pole 4 and the adapter 3, and at the same time avoiding the problem of failure of the fuse structure on the adapter 3 caused by the overlap of the first pole lug 102, the second pole lug 202 and the pole 4.

[0130] Furthermore, the first pole tab 102 includes a first positive pole tab 1021 and a first negative pole tab 1022, and the first positive pole tab 1021 and the first negative pole tab 1022 are led out from the same end of the first battery cell 1; the second pole tab 202 includes a second positive pole tab 2021 and a second negative pole tab 2022, and the second positive pole tab 2021 and the second negative pole tab 2022 are led out from the same end of the second battery cell 2; the distance a between the root of the first pole tab 102 and the root of the second pole tab 202, and the distance b between the end of the first pole tab 102 and the end of the second pole tab 202 satisfy: 10mm≤ab≤50mm.

[0131] In this embodiment, the positive electrode tab and the negative electrode tab of the first battery cell 1 are led out from the same end. Specifically, the first positive electrode tab 1021 and the first negative electrode tab 1022 are led out from the same end of the first battery cell 1. Similarly, the positive electrode tab and the negative electrode tab of the first battery cell 1 are led out from the same end. Specifically, the second positive electrode tab 2021 and the second negative electrode tab 2022 are led out from the same end of the second battery cell 2. In other words, all the tabs of the first battery cell 1 and the second battery cell 2 are led out from the same end. At this time, the flow area of ​​the first tab 102 and the second tab 202 is relatively small, resulting in a slower current transmission rate. Therefore, the numerical range of "ab" is narrowed to ensure the battery current transmission rate and shorten the overall charge and discharge time of the battery.

[0132] At this time, for example, the value of "ab" can be 10mm, 21mm, 32mm, 46mm, 50mm, etc.

[0133] Furthermore, the distance between the end of the first electrode tab 102 and the outer periphery of the electrode 4 and the distance between the end of the second electrode tab 202 and the outer periphery of the electrode 4 are both L, satisfying the following: 0.5 mm ≤ L ≤ 10 mm.

[0134] like Figure 3 As shown, there is a certain distance L between the end of the first pole tab 102 and the outer periphery of the pole 4. If the distance L is too small, the first pole tab 102 and the pole 4 are likely to overlap too closely, and the second pole tab 202 and the pole 4 are likely to overlap too closely; if the distance L is too large, the battery size will increase and the space utilization will be reduced.

[0135] In this embodiment, the distance L satisfies 0.5 mm ≤ L ≤ 10 mm. Within the above range, the first electrode tab 102 and the electrode 4, and the second electrode tab 202 and the electrode 4 will not overlap too closely, thereby ensuring the welding quality of the electrode 4 and the adapter 3, and making the battery structure compact and the space utilization high.

[0136] For example, the distance L may be 0.5 mm, 1.3 mm, 2.5 mm, 4 mm, 5.5 mm, 7.2 mm, 10 mm, etc.

[0137] The battery involved in this embodiment is a single cell. The preparation method of the battery is described below:

[0138] The single cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and this embodiment does not limit this. The single cell may generally include a battery shell, a battery cell, a switching plate, and an electrolyte. The battery shell is used to accommodate the battery cell and the electrolyte. The battery shell generally includes a battery shell body and a cover plate. At least one positive electrode column and at least one negative electrode column are arranged on the shell and / or the cover plate. The battery cell includes one or more electrode assemblies. The electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a diaphragm. The diaphragm is located between adjacent positive and negative electrodes to insulate the positive and negative electrodes. At least one end of the electrode assembly has a tab. One end of the switching plate is electrically connected to the tab, and the other end is electrically connected to the pole.

[0139] Taking the wound battery cell as an example, the specific preparation process is as follows: the positive electrode sheet, the negative electrode sheet and the diaphragm are wound to form an electrode assembly, and the tab is led out at one end of the electrode assembly. When the tab is fixed to the adapter, the electrode assembly and the tab are first placed along the tab lead-out direction, and then the tab of the electrode assembly is welded to the tab welding area of ​​the adapter, and then the adapter is welded to the pole column on the cover plate at the pole column welding area of ​​the adapter. After welding is completed, the pole column and the tab are located on the same side in the thickness direction of the adapter, and then the electrode assembly is folded along the connection position between the tab and the electrode assembly so that the electrode assembly and the pole column are located on both sides of the thickness direction of the adapter, the folded electrode assembly is put into the shell, and the cover plate and the battery shell body are welded and sealed, liquid is injected, formed, and the injection hole is sealed to obtain a single cell.

[0140] The following describes the test process of battery overcurrent capability:

[0141] For each embodiment and comparative example, 10 batteries were taken respectively. The distance between the root of the first pole ear and the root of the second pole ear was set to a, and the distance between the end of the first pole ear and the end of the second pole ear was set to b according to the table below. Other than that, the other characteristics of the battery cells were the same. The battery was discharged to 0% SOC at 0.33C, and after standing for 60 minutes, the temperature at this time was measured and recorded as t1. The battery was charged to 100% SOC at 1C, the time was recorded as T, and the temperature at this time was measured and recorded as t2. The temperature rise rate was calculated according to the formula: temperature rise rate = (t2-t1) / T. If the temperature rise rate is greater than or equal to 0.9℃ / min, it is unqualified. If the temperature rise rate is less than 0.9℃ / min, it is qualified.

[0142] The following describes the test process of the welding strength between the battery terminal 4 and the adapter 3:

[0143] For each embodiment and comparative example, 10 batteries were taken respectively. The distance between the root of the first pole ear and the root of the second pole ear was set to a, and the distance between the end of the first pole ear and the end of the second pole ear was set to b according to the table below. Other characteristics of the battery cells were the same. A universal tensile testing machine was used to test the adapter at one end and the pole at the other end. The 90° peel strength between the pole and the adapter was tested. If the peel strength was greater than or equal to 400N, it was qualified. If the peel strength was less than 400N, it was unqualified.

[0144] The following tests are conducted on the battery's overcurrent capacity (temperature rise rate) and the welding strength between the adapter and the terminal:

[0145]

[0146]

[0147] It can be seen from the above table that for Examples 1 to 14, the value of "ab" satisfies 10mm≤ab≤65mm, the temperature rise rate of the battery is less than or equal to 0.9℃ / min, the current capacity of the battery meets the requirements, the tension between the adapter 3 and the pole 4 is greater than 400N, and the welding strength between the adapter 3 and the pole 4 is high, meeting the welding strength requirements.

[0148] For Comparative Examples 1 to 6, the value of "ab" exceeds the range of 10mm to 65mm, and the battery's overcurrent capacity and the welding strength between the adapter 3 and the pole 4 do not meet the requirements. When the value of "ab" is too small, the tension (peel strength) between the adapter 3 and the pole 4 is less than 400N, the welding strength between the adapter 3 and the pole 4 is insufficient, and the battery temperature rise is large, and the battery's overcurrent capacity does not meet the requirements. When the value of "ab" is too large, although the tension (peel strength) between the adapter 3 and the pole 4 is greater than 400N and the welding strength between the adapter 3 and the pole 4 meets the requirements, the battery temperature rise is too large, and the battery's overcurrent capacity does not meet the requirements.

[0149] This embodiment also provides an electrical device comprising a housing and the aforementioned battery, wherein at least two batteries are provided, and the housing is configured to accommodate the at least two batteries. The electrical device may be a passenger vehicle, commercial vehicle, energy storage device, electric ship, aircraft, laptop, or other electrical device.

[0150] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: A first battery cell (1) comprising a first battery cell body (101) and a first tab (102), wherein the first tab (102) is led out from the first battery cell body (101), and the first tab (102) comprises a root portion connected to the first battery cell body (101) and an end portion away from the first battery cell body (101); A second battery cell (2) comprising a second battery cell body (201) and a second pole tab (202), wherein the second pole tab (202) is led out from the end of the second battery cell body (201), and the second pole tab (202) comprises a root portion connected to the end of the second battery cell body (201) and an end away from the second battery cell body (201); The end of the first battery cell (1) leading out of the first pole tab (102) and the end of the second battery cell (2) leading out of the second pole tab (202) are located on the same side; and the polarity of the first pole tab (102) and the second pole tab (202) are the same; A transition piece (3), wherein the first pole lug (102) and the second pole lug (202) are at least partially disposed on an upper portion of a first surface (301) of the transition piece (3) and are electrically connected to the first surface (301), the first surface (301) is disposed away from the first battery cell body (101) and the second battery cell body (201), the first surface (301) has a pole connection area, and a portion of the pole connection area is disposed opposite to an end of the first pole lug (102) and an end of the second pole lug (202); A pole (4) electrically connected to the pole connection area; On the first surface (301), along the width direction of the battery, the distance between the root of the first pole tab (102) and the root of the second pole tab (202) is a, and the distance between the end of the first pole tab (102) and the end of the second pole tab (202) is b, satisfying: 10mm≤ab≤65mm.

2. The battery according to claim 1, characterized in that The distance between the root of the first pole tab (102) and the end of the first pole tab (102) is c1, and the distance between the root of the second pole tab (202) and the end of the second pole tab (202) is c2, satisfying: 0.8≤c1 / c2≤1.

2.

3. The battery according to claim 1, characterized in that The adapter (3) includes a first connecting portion (304) and a second connecting portion (305); the first pole tab (102) is at least partially electrically connected to the first surface (301) of the first connecting portion (304); the second pole tab (202) is at least partially electrically connected to the first surface (301) of the second connecting portion (305); and along the width direction of the battery, the first connecting portion (304) and the second connecting portion (305) are spaced apart.

4. The battery according to claim 3, characterized in that The end of the first electrode tab (102) extends beyond the inner edge of the first connecting portion (304); and / or the end of the second electrode tab (202) extends beyond the inner edge of the second connecting portion (305).

5. The battery according to claim 4, characterized in that The distance a between the root of the first pole tab (102) and the root of the second pole tab (202), and the distance b between the end of the first pole tab (102) and the end of the second pole tab (202) satisfy: 10mm≤ab≤55mm.

6. The battery according to claim 3, characterized in that Along the width direction of the battery, the ratio of the spacing distance d between the first connecting portion (304) and the second connecting portion (305) to the width e of the adapter (3) is 0.2≤d / e≤0.

8.

7. The battery according to claim 3, characterized in that The first tab (102) is electrically connected to the adapter (3) to form a first tab connection area, and the second tab (202) is electrically connected to the adapter (3) to form a second tab connection area; the adapter (3) is provided with a fuse structure, and the fuse structure is provided between the first tab connection area and the pole connection area, and between the second tab connection area and the pole connection area.

8. The battery according to claim 7, characterized in that The distance a between the root of the first pole tab (102) and the root of the second pole tab (202), and the distance b between the end of the first pole tab (102) and the end of the second pole tab (202) satisfy: 18mm≤ab≤65mm.

9. The battery according to claim 7, characterized in that The fuse structures include at least two, and the at least two fuse structures are respectively arranged on the first connecting portion (304) and the second connecting portion (305).

10. The battery according to claim 7, characterized in that The adapter (3) comprises a positive electrode adapter (302) and a negative electrode adapter (303), and the fuse structure is provided on the positive electrode adapter (302); The first electrode tab (102) includes a first positive electrode tab (1021) and a first negative electrode tab (1022); the second electrode tab (202) includes a second positive electrode tab (2021) and a second negative electrode tab (2022); the first positive electrode tab (1021) and the second positive electrode tab (2021) are electrically connected to the positive electrode adapter (302); and the first negative electrode tab (1022) and the second negative electrode tab (2022) are electrically connected to the negative electrode adapter (303); On the first surface (301) of the positive electrode adapter (302), along the width direction of the battery, the distance between the root of the first positive electrode tab (1021) and the root of the second positive electrode tab (2021) is a1, the distance between the end of the first positive electrode tab (1021) and the end of the second positive electrode tab (2021) is b1, the distance between the root of the first negative electrode tab (1022) and the root of the second negative electrode tab (2022) is a2, and the distance between the end of the first negative electrode tab (1022) and the end of the second negative electrode tab (2022) is b2, satisfying: a1-b1<a2-b2.

11. The battery according to claim 1, characterized in that The pole connection area is provided on the first surface (301), and the pole connection area is provided with a transition piece protrusion (3011) protruding toward the pole (4).

12. The battery according to claim 11, characterized in that The distance a between the root of the first pole tab (102) and the root of the second pole tab (202), and the distance b between the end of the first pole tab (102) and the end of the second pole tab (202) satisfy: 20mm≤ab≤55mm.

13. The battery according to claim 11, characterized in that The height of the adapter protrusion (3011) protruding toward the pole (4) ranges from 0.3 mm to 1 mm.

14. The battery according to claim 11, characterized in that The adapter protrusion (3011) is arranged near the outer periphery of the end of the first pole lug (102) or the end of the second pole lug (202) and exceeds the outer periphery of the bottom surface of the pole (4).

15. The battery according to claim 14, characterized in that The top surface area of ​​the protruding portion (3011) of the adapter is S1, and the bottom surface area of ​​the pole (4) is S2, which satisfies the following relationship: 1.1≤s1 / s2≤3.

16. The battery according to claim 15, characterized in that The distance a between the root of the first pole tab (102) and the root of the second pole tab (202), and the distance b between the end of the first pole tab (102) and the end of the second pole tab (202) satisfy: 10mm≤ab≤50mm.

17. The battery according to claim 11, characterized in that The outer periphery of the adapter protrusion (3011) close to the end of the first pole lug (102) or the end of the second pole lug (202) does not exceed the outer periphery of the bottom surface of the pole (4).

18. The battery according to claim 17, characterized in that The top surface area of ​​the protruding portion (3011) of the adapter is S1, and the bottom surface area of ​​the pole (4) is S2, which satisfies the following relationship: 0.2≤s1 / s2≤0.

9.

19. The battery according to claim 18, characterized in that The distance a between the root of the first pole tab (102) and the root of the second pole tab (202), and the distance b between the end of the first pole tab (102) and the end of the second pole tab (202) satisfy: 15mm≤ab≤55mm.

20. The battery according to claim 11, characterized in that It also includes a shell (6), the shell (6) is provided with a through hole, and the adapter protrusion (3011) is at least partially arranged in the through hole.

21. The battery according to claim 20, characterized in that The distance a between the root of the first pole tab (102) and the root of the second pole tab (202), and the distance b between the end of the first pole tab (102) and the end of the second pole tab (202) satisfy: 23mm≤ab≤65mm.

22. The battery according to claim 1, characterized in that The pole (4) has a connection end (401) electrically connected to the first surface (301), and an edge of the connection end (401) is formed with a step structure, and the step structure is farther away from the first surface (301) than other parts of the connection end (401).

23. The battery according to claim 1, characterized in that The distance a between the root of the first electrode tab (102) and the root of the second electrode tab (202) satisfies: 30 mm ≤ a ≤ 80 mm.

24. The battery according to claim 1, characterized in that The distance b between the end of the first electrode tab (102) and the end of the second electrode tab (202) satisfies the following relationship: 15 mm ≤ b ≤ 30 mm.

25. The battery according to claim 1, characterized in that The invention also includes an insulating member (5), wherein the insulating member (5) is arranged on a side of the first pole lug (102) and the second pole lug (202) facing away from the adapter (3), and the position where the first pole lug (102) and the second pole lug (202) are electrically connected to the adapter (3) is an electrical connection area, and the insulating member (5) is provided with an insulating member protrusion (501) at a position corresponding to the electrical connection area of ​​the first pole lug (102) and the electrical connection area of ​​the second pole lug (202), and the insulating member protrusion (501) protrudes in a direction away from the first pole lug (102) and the second pole lug (202).

26. The battery according to claim 1, wherein The first electrode tab (102) comprises a first positive electrode tab (1021) and a first negative electrode tab (1022), and the first positive electrode tab (1021) and the first negative electrode tab (1022) are led out from the same end of the first battery cell (1); The second electrode tab (202) comprises a second positive electrode tab (2021) and a second negative electrode tab (2022), and the second positive electrode tab (2021) and the second negative electrode tab (2022) are led out from the same end of the second battery cell (2); The distance a between the root of the first pole tab (102) and the root of the second pole tab (202), and the distance b between the end of the first pole tab (102) and the end of the second pole tab (202) satisfy: 10mm≤ab≤50mm.

27. The battery according to any one of claims 1 to 26, characterized in that The distance between the end of the first pole lug (102) and the outer periphery of the pole (4), and the distance between the end of the second pole lug (202) and the outer periphery of the pole (4) are both L, satisfying: 0.5 mm ≤ L ≤ 10 mm.

28. An electrical device, characterized in that: The invention comprises at least two batteries according to any one of claims 1 to 27, and a box for accommodating at least two of the batteries.

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