Battery and electric device

Abstract

The application relates to the technical field of new energy batteries, and discloses a battery and a power utilization device, which can guarantee the distance between the first tab, the second tab and the pole, the end of the first tab and the end of the second tab cannot be arranged between the pole and the adapter, the welding quality of the pole and the adapter is guaranteed, the overcurrent capacity between the pole and the adapter is ensured, and meanwhile, the overcurrent capacity of the first tab and the second tab is not affected. 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 part of a first surface of the adapter and are electrically connected with the first surface, the pole is electrically connected with the first surface, 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, the distance between the end of the first tab and the end of the second tab is b, and the following condition is met: 10mm <= a-b <= 65mm.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, specifically to a battery and an electrical device. Background Technology

[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 plants, as well as in many technical fields such as power tools, electric bicycles, electric motorcycles, electric cars, military equipment, and aerospace.

[0003] In existing batteries, the tabs from the cell are typically bent, constricted, and fixed to the lower surface of the adapter plate, resulting in low internal space utilization and affecting battery energy density. To improve space utilization in the height direction of the battery, the tabs are bent to the upper surface of the adapter plate. However, this arrangement makes it easy for the end of the tab to overlap with the position between the terminal and the adapter plate, which can easily cause poor soldering between the terminal and the adapter plate, 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 that the end of the tab located on the upper surface of the adapter plate in existing batteries is prone to causing poor soldering between the terminal and the adapter plate, affecting the welding quality and current carrying capacity of the terminal and the adapter plate.

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

[0006] The first battery cell includes a first battery cell body and a first electrode tab. The first electrode tab extends from the first battery cell body and includes a root portion connected to the first battery cell body and an end portion away from the first battery cell body.

[0007] The second battery cell includes a second battery cell body and a second electrode tab. The second electrode tab extends from the end of the second battery cell body and includes a root portion connected to the end of the second battery cell body and an end portion away from the second battery cell body.

[0008] The end of the first battery cell from which the first electrode tab is led out is located on the same side as the end of the second battery cell from which the second electrode tab is led out, and the polarity of the first electrode tab and the second electrode tab is the same;

[0009] The adapter has a small portion of the first tab and the second tab disposed on the upper part of the first surface of the adapter and electrically connected to the first surface. The first surface is disposed away from the first cell body and the second cell body. The first surface has a pole connection area, and a portion of the pole connection area is disposed opposite to the end of the first tab and the end of the second tab.

[0010] The electrode post is electrically connected to the electrode post connection area;

[0011] 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: 10mm≤ab≤65mm.

[0012] Beneficial Effects: The battery of the present invention includes a first cell and a second cell. The first and second tabs are at least partially disposed on the upper part of a first surface of the adapter and electrically connected to the first surface. The terminal post is electrically connected to the terminal post connection area of ​​the first surface. 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: 10mm ≤ ab ≤ 65mm. In a dual-cell battery, the internal 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 terminal post, and the distance between the second tab and the terminal post are ensured. This prevents the ends of the first and second tabs from being placed between the terminal post and the adapter, avoiding incomplete soldering between the terminal post and the adapter, ensuring the welding quality between the terminal post and the adapter, and thus ensuring the current carrying capacity between the terminal post and the adapter.

[0013] Furthermore, 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, satisfy 10mm≤ab≤65mm. Within this range, the ends of the first and second tabs are less likely to be placed in the gap between the terminal post and the adapter, thus preventing poor soldering between the terminal post and the adapter and ensuring the welding quality between the terminal post and the adapter, thereby guaranteeing the current carrying capacity between the terminal post and the adapter. At the same time, the electrical connection area between the first tab and the adapter, and the electrical connection area between the second tab and the adapter, are not too small, ensuring the current carrying capacity between the first tab and the adapter, and the current carrying capacity between the second tab and the adapter. When the battery is charged at a high rate, the heat generated by the first and second tabs will not be too large, thus reducing the risk of thermal runaway. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

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

[0016] Figure 2 This is a schematic diagram of the battery of the present invention (the top part of the structure and the casing are hidden);

[0017] Figure 3 for Figure 2 Top view;

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

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

[0020] Figure 6 for Figure 5 An enlarged schematic diagram of section C;

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

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

[0023] Figure 9 This is a perspective view of the positive electrode adapter in the battery of the present invention.

[0024] Explanation of reference numerals in the attached figures:

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

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

[0027] 3. Adapter; 301. First surface; 3011. Adapter protrusion; 302. Positive electrode adapter; 303. Negative electrode adapter; 304. First connecting part; 305. Second connecting part; 306. Fusible elongated hole;

[0028] 4. Pole post; 401. Connecting end; 402. Stepped surface;

[0029] 5. Insulating component; 501. Protrusion of insulating component;

[0030] 6. Shell. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Currently, the tabs from the battery cells are typically welded to the lower surface of the adapter plate, resulting in a large required height space between the adapter plate and the cell. This leads to low battery space utilization and affects battery energy density. To improve space utilization in the height direction of the battery, the tabs can be bent to the upper surface of the adapter plate and welded to it, reducing the required height space between the adapter plate and the cell. However, the upper surface of the adapter plate still needs to be welded to the terminal block. Especially in dual-cell batteries where space is limited, the end of the tab on the upper surface of the adapter plate is very close to the welding position of the terminal block. The end of the tab can easily be inserted into the welding position between the adapter plate and the terminal block. When welding the terminal block and the adapter plate, because the end of the tab is placed between the terminal block and the adapter plate, it can easily lead to a poor weld, affecting the welding quality of the terminal block and the adapter plate, and consequently affecting the current carrying capacity between the terminal block and the adapter plate.

[0033] The following is combined with Figures 1 to 9 This describes embodiments of the battery and power-consuming device of the present invention.

[0034] According to an embodiment of the present invention, in one aspect, a battery is provided, comprising: a first battery cell 1, a second battery cell 2, an adapter 3, and terminals 4. The first battery cell 1 includes a first battery cell body 101 and a first electrode 102, the first electrode 102 extending from the first battery cell body 101, and the first electrode 102 including a root connected to the first battery cell body 101 and an end remote from the first battery cell body 101. The second battery cell 2 includes a second battery cell body 201 and a second electrode 202, the second electrode 202 extending from the end of the second battery cell body 201, and the second electrode 202 including a root connected to the end of the second battery cell body 201 and an end remote from the second battery cell body 201. The end of the first battery cell 1 from which the first electrode 102 extends and the end of the second battery cell 2 from which the second electrode 202 extends are located on the same side, and the first electrode 102 and the second electrode 202 have the same polarity. The first tab 102 and the second tab 202 of the adapter 3 are at least partially disposed on the upper part of the first surface 301 of the adapter 3 and electrically connected to the first surface 301. The first surface 301 is disposed facing away from the first cell body 101 and the second cell body 201. The first surface 301 has a terminal connection area, and a portion of the terminal connection area is disposed opposite to the end of the first tab 102 and the end of the second tab 202. A terminal 4 is electrically connected to the terminal connection area. On the first surface 301, along the width direction of the battery, 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, satisfying: 10mm ≤ ab ≤ 65mm.

[0035] This embodiment controls the distance 'a' between the root of the first tab 102 and the root of the second tab 202, and the distance 'b' between the end of the first tab 102 and the end of the second tab 202, to ensure the distance between the first tab 102 and the pole post 4, and the distance between the second tab 202 and the pole post 4. This prevents the ends of the first tab 102 and the second tab 202 from being placed between the pole post 4 and the adapter 3, thus preventing the pole post 4 and the adapter 3 from forming a cold solder joint, ensuring the welding quality between the pole post 4 and the adapter 3, and thereby ensuring the current carrying capacity between the pole post 4 and the adapter 3.

[0036] Furthermore, the distance 'a' between the root of the first tab 102 and the root of the second tab 202, and the distance 'b' between the end of the first tab 102 and the end of the second tab 202 satisfy 10mm≤ab≤65mm. Within this range, the ends of the first tab 102 and the second tab 202 are less likely to be placed in the gap between the terminal post 4 and the adapter 3, thus preventing the terminal post 4 and the adapter 3 from having a poor weld. This ensures the welding quality between the terminal post 4 and the adapter 3 and guarantees the current carrying capacity between the terminal post 4 and the adapter 3. At the same time, the electrical connection area between the first tab 102 and the adapter 3, as well as the electrical connection area between the second tab 202 and the adapter 3, will not be too small, ensuring the current carrying capacity between the first tab 102 and the adapter 3, as well as the current carrying capacity between the second tab 202 and the adapter 3. When the battery is charged at a high rate, the heat generated by the first tab 102 and the second tab 202 will not be too large, thus reducing the risk of thermal runaway.

[0037] The battery includes a casing 6, which protects the internal structure of the battery and improves its impact resistance and structural stability. The casing 6 includes a cover plate and a casing body. At least one end of the casing body has an opening, which is sealed by the cover plate to isolate the interior and exterior of the casing 6. The cover plate and casing body can be fixed together by welding, bonding, riveting, or other methods. Inside the battery casing 6 is a battery cell, which is the battery's energy storage unit. Energy is stored and released through electrochemical reactions within the cell (the interaction of the positive electrode material, negative electrode material, and electrolyte). The casing 6 can be made of metals such as aluminum, aluminum alloy, copper, nickel, stainless steel, or carbon steel.

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

[0039] In this embodiment, the battery casing 6 contains two battery cells, namely a first battery cell 1 and a second battery cell 2, to meet the power demand. The first battery cell 1 includes a first battery cell body 101 and a first electrode 102. The first battery cell 1 is formed by stacking or winding positive and negative electrode sheets, and current is led out through the first electrode 102. The first battery cell body 101 is the main part of the first battery cell 1, and is formed by stacking or winding positive and negative electrode sheets and a separator. The first electrode 102 extends from the end of the first battery cell body 101, and the first battery cell body 101 and the first electrode 102 are electrically connected. The first electrode 102 serves as a conductive electrode connecting the first battery cell body 101 to the external circuit, and is used to transmit current. The first electrode 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 tab 202. The second battery cell 2 is formed by stacking or winding positive and negative electrode plates, and current is drawn out through the second tab 202. The second battery cell body 201 is the main part of the second battery cell 2, and the second battery cell body 201 is formed by stacking or winding positive electrode plates, negative electrode plates, and separators. The second tab 202 extends from the end of the second battery cell body 201, and the second battery cell body 201 and the second tab 202 are electrically connected. The second tab 202 serves as a conductive electrode connecting the second battery cell body 201 to the external circuit for transmitting current. The second 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 battery cell 1 from which the first tab 102 is drawn is located on the same side as the end of the second battery cell 2 from which the second tab 202 is drawn, and the polarity of the first tab 102 and the second tab 202 is 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. The ends of the leads of the first battery cell 1 and the second battery cell 2 face the same direction, that is, the end of the first battery cell 1 leading out of the first lead 102 and the end of the second battery cell 2 leading out of the second lead 202 are located on the same side. Figure 2 Taking the first cell body 101 as an example, two first tabs 102 are led out from the upper end of the first cell body 101. Similarly, two second tabs 202 are led out from the upper end of the second cell body 201. The positions of the first tabs 102 and the second tabs 202 correspond to each other to facilitate circuit connection.

[0042] The first electrode 102 and the second electrode 202 have the same polarity. For example, both the first electrode 102 and the second electrode 202 are positive electrodes, or both are negative electrodes. The positive and negative electrodes 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 area of ​​the cell, and the width direction is perpendicular to the large surface area of ​​the cell. The large surface area of ​​the cell refers to the side of the cell with the largest outer surface area. For example... Figure 1 and Figure 3 As shown, the length direction of the battery is the x-direction, the width direction is the y-direction, and the height direction is the z-direction.

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

[0045] Typically, the thickness of the adapter 3 is between the thickness of a single tab and the thickness of a pole piece, to avoid the risk of the tab burning through during welding between the tab and the pole. The first tab 102 and the second tab 202 are welded to the adapter 3 by methods such as ultrasonic welding, laser welding, or resistance welding.

[0046] The adapter 3 is typically a sheet-like structure and is disposed between the first cell body 101 and the terminal post 4, and between the second cell body 201 and the terminal post 4. Specifically, the adapter 3 is disposed near the end of the first cell body 101 from which the first tab 102 is led out, and near the end of the second cell body 201 from which the second 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 being disposed opposite to each other, the second surface being disposed facing the first cell body 101 and the second cell body 201, and the first surface 301 being disposed away from the first cell body 101 and the second cell body 201. When the battery is in the vertical direction ( Figure 1 When setting the z-direction, such as Figures 1-2 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 tab 102 extends from the end of the first cell body 101, and at least a portion of the first tab 102 is wound around the first surface 301 of the adapter 3, such that at least a portion of the first tab 102 is disposed on the upper part of the first surface 301 and electrically connected to the first surface 301. The first surface 301 has a first tab connection area for electrical connection with the first tab 102. Similarly, the second tab 202 extends from the end of the second cell body 201, and at least a portion of the second tab 202 is wound around the first surface 301 of the adapter 3, such that at least a portion of the second tab 202 is disposed on the upper part of the first surface 301 and electrically connected to the first surface 301. The first surface 301 has a second tab connection area for electrical connection with the second tab 202. With this configuration, the distance between the adapter 3 and the first cell body 101 and the second cell body 201 is small, which can reduce the overall height of the battery (along the...). Figure 1 The dimensions in the z-direction improve the utilization rate of the internal height space of the battery. 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 welded.

[0048] The terminal post 4 is the core component for connecting the internal and external circuits of the battery. The terminal post 4 is positioned near the first surface 301 of the adapter 3; specifically, the terminal post 4 is located on one side of the adapter 3, while the first cell body 1 and the second cell body 201 are located on the other side of the adapter 3. The terminal post 4 is also electrically connected to the first surface 301, which has a terminal post connection area that is electrically connected to the terminal post 4. This connection area is offset from the first tab connection area and the second tab connection area, with a portion of the connection area opposite to the ends of the first tab 102 and the second tab 202. In this embodiment, the electrical connection between the terminal post 4 and the first surface 301 is achieved by welding. Along the width direction of the battery, the electrical connection position (terminal post connection area) between the terminal post 4 and the first surface 301 is located between the first tab 102 and the second tab 202. The terminal post 4 can be made of 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 tab 102 and the second tab 202 on the left 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'. Distances a and b satisfy 10mm ≤ ab ≤ 65mm. Within the above range, the ends of the first tab 102 and the second tab 202 are less likely to be placed in the gap between the terminal post 4 and the adapter 3, which is less likely to cause a false weld between the terminal post 4 and the adapter 3, ensuring the welding quality between the terminal post 4 and the adapter 3 and guaranteeing the current carrying capacity between the terminal post 4 and the adapter 3. At the same time, the electrical connection area between the first tab 102, the second tab 202 and the adapter 3 will not be too small, which can guarantee the current carrying capacity between the first tab 102 and the adapter 3, as well as the current carrying capacity between the second tab 202 and the adapter 3. When the battery is charged at a high rate, the heat generated by the first tab 102 and the second tab 202 will not be too large, and the risk of thermal runaway is not likely to occur.

[0050] If the value of "ab" is too small, the electrical connection area (welding area) between the first tab 102 and the adapter 3, and the electrical connection area (welding area) between the second tab 202 and the adapter 3 will be too small, affecting the overcurrent capacity between the first tab 102 and the adapter 3, and the overcurrent capacity between the second tab 202 and the adapter 3. This will cause the overcurrent capacity of the first tab 102 and the second tab 202 to be unable to meet the overcurrent requirements. When the battery is being fast charged at a high rate, the first tab 102 and the second tab 202 will generate a lot of heat, and the battery will have safety risks such as thermal runaway.

[0051] If the value of "ab" is too large, the distance between the first tab 102 and the pole post 4, and the distance between the second tab 202 and the pole post 4 will still be too close. The ends of the first tab 102 and the second tab 202 will still easily insert into the gap between the pole post 4 and the adapter 3. When the pole post 4 and the adapter 3 are welded, the ends of the first tab 102 and the second tab 202 will insert into the gap between the pole post 4 and the adapter 3, resulting in a poor weld between the pole post 4 and the adapter 3, which will affect the current carrying capacity between the pole post 4 and the adapter 3.

[0052] In this embodiment, the distance 'a' between the root of the first tab 102 and the root of the second tab 202, and the distance 'b' between the end of the first tab 102 and the end of the second tab 202, satisfy 0mm≤ab≤65mm. Within the above range, the value of 'ab' will not be too small or too large, and the ends of the first tab 102 and the second tab 202 are unlikely to be placed in the gap between the terminal post 4 and the adapter 3, thus preventing the terminal post 4 and the adapter 3 from having a poor weld, ensuring the welding quality of the terminal post 4 and the adapter 3, and guaranteeing the current carrying capacity between the terminal post 4 and the adapter 3. At the same time, the electrical connection area between the first tab 102 and the adapter 3, and the electrical connection area between the second tab 202 and the adapter 3, will not be too small, ensuring the current carrying capacity between the first tab 102 and the adapter 3, and the current carrying capacity between the second tab 202 and the adapter 3. When the battery is charged at a high rate, the heat generated by the first tab 102 and the second tab 202 will not be too large, and the risk of thermal runaway is not easily generated.

[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 102 and the root of the second electrode 202 satisfies: 30mm≤a≤80mm.

[0055] The distance 'a' between the root of the first tab 102 and the root of the second tab 202 should not be too small or too large. If the distance 'a' is too small, the ends of the first tab 102 and the second tab 202 will be inserted into the gap between the terminal post 4 and the adapter 3, resulting in a poor weld between the terminal post 4 and the adapter 3. This will affect the current carrying capacity between the terminal post 4 and the adapter 3. Furthermore, the electrical connection area between the first tab 102 and the adapter 3, as well as the electrical connection area between the second tab 202 and the adapter 3, will be too small, which will not guarantee the current carrying capacity between the first tab 102 and the adapter 3, as well as the current carrying capacity between the second tab 202 and the adapter 3. When the battery is charged at a high rate, the first tab 102 and the second tab 202 will generate a lot of heat, which may easily lead to the risk of thermal runaway. If the distance 'a' between the root of the first tab 102 and the root of the second tab 202 is too large, the current transmission path of the battery will be too long, resulting in excessive internal resistance during current transmission, excessive heat generation, poor space utilization of the battery, and low energy density of the battery.

[0056] In this embodiment, the distance 'a' between the root of the first tab 102 and the root of the second tab 202 is 30mm ≤ a ≤ 80mm. Within this range, the ends of the first tab 102 and the second tab 202 are less likely to be placed in the gap between the terminal post 4 and the adapter 3, thus preventing poor soldering between the terminal post 4 and the adapter 3. This ensures the welding quality between the terminal post 4 and the adapter 3 and guarantees the current carrying capacity between the terminal post 4 and the adapter 3. Furthermore, the electrical connection area between the first tab 102, the second tab 202, and the adapter 3 is neither too small nor too large, ensuring the current carrying capacity of both the first tab 102 and the adapter 3, as well as the second tab 202 and the adapter 3. Simultaneously, the battery current transmission path is not too long, the internal resistance during current transmission is not too high, and the heat generation is relatively small, reducing the risk of thermal runaway and improving the battery's space utilization and energy density.

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

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

[0059] The distance b between the end of the first tab 102 and the end of the second tab 202 should not be too small or too large. If the distance b is too small, the ends of the first tab 102 and the second tab 202 are likely to be placed in the gap between the terminal 4 and the adapter 3, which may cause poor soldering between the terminal 4 and the adapter 3, failing to ensure the welding quality between the terminal 4 and the adapter 3 and affecting the current carrying capacity between the terminal 4 and the adapter 3. If the distance b is too large, the electrical connection area between the first tab 102, the second tab 202 and the adapter 3 will be small, which may not guarantee the current carrying capacity between the first tab 102 and the adapter 3, as well as the current carrying capacity between the second tab 202 and the adapter 3. When the battery is charged at a high rate, the first tab 102 and the second tab 202 will 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 tab 102 and the end of the second tab 202 is in the range of 15mm ≤ b ≤ 30mm. Within this range, the ends of the first tab 102 and the second tab 202 are less likely to be placed in the gap between the pole post 4 and the adapter 3, thus reducing the risk of poor soldering between the pole post 4 and the adapter 3 and ensuring the welding quality between the pole post 4 and the adapter 3, thereby guaranteeing the current carrying capacity between the pole post 4 and the adapter 3. Simultaneously, the electrical connection area between the first tab 102, the second tab 202, and the adapter 3 is neither too small nor too large, ensuring the current carrying capacity between the first tab 102 and the adapter 3, as well as the current carrying capacity between the second tab 202 and the adapter 3, resulting in less heat generation and reducing the risk of thermal runaway.

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

[0062] Furthermore, the distance between the root of the first electrode 102 and the end of the first electrode 102 is c1, and the distance between the root of the second electrode 202 and the end of the second electrode 202 is c2, satisfying: 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 side by side. On the first battery cell 1, the distance between the root of the first tab 102 and the end of the first tab 102 is c1; on the second battery cell 2, the distance between the root of the second tab 202 and the end of the second tab 202 is c2, and the following condition is met: 0.8≤c1 / c2≤1.2, that is, the ratio of 1 to c2 is close to 1, so that the widths (dimensions along the width direction of the battery) of the first tab 102 and the second tab 202 are close, thereby ensuring that the distance between the first tab 102 and the terminal 4 and the distance between the second tab 202 and the terminal 4 are uniform, avoiding the distance between the first tab 102 and the terminal 4 being too close, and avoiding the distance between the second tab 202 and the terminal 4 being too close, thus ensuring the welding quality and current carrying capacity of the terminal 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 tab 102 is at least partially electrically connected to the first surface 301 of the first connecting portion 304, and the second tab 202 is at least partially electrically connected to the first surface 301 of the second connecting portion 305. The first connecting portion 304 and the second connecting portion 305 are spaced apart along the width direction of the battery.

[0066] like Figure 3 , 8As shown in Figure 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 positive adapter 302 and the negative adapter 303 have basically the same structure.

[0067] In this embodiment, the adapter 3 is a U-shaped adapter piece. The electrode welding area of ​​the adapter 3 is located in the center, and the two extended portions of the adapter 3 are electrically connected to the first electrode tab 102 and the second electrode tab 202, respectively. Specifically, taking the positive electrode adapter 302 as an example, as follows... Figures 8-9 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 with respect 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] In this configuration, the side of the first connecting portion 304 facing away from the first cell body 101 is its first surface 301, and the first tab 102 is at least partially electrically connected to the first surface 301 of the first connecting portion 304. Similarly, the side of the second connecting portion 305 facing away from the second cell body 201 is its first surface 301, 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. The space between them forms a convergence space, which allows the first tab 102 and the second tab 202 to be partially bent and housed in the convergence space, thus preventing the first tab 102 and the second tab 202 from overlapping with the terminal 4 and affecting the welding yield of the terminal 4 and the adapter 3.

[0070] Furthermore, the end of the first tab 102 extends beyond the inner edge of the first connecting portion 304; and / or, the end of the second 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 a U-shaped opening. When the first electrode 102 is at least partially electrically connected to the first connecting portion 304, the end of the first electrode 102 extends beyond the inner edge of the first connecting portion 304. This arrangement ensures that the electrical connection area (welding area) between the first electrode 102 and the first connecting portion 304 is maximized, ensuring that all first electrodes 102 are welded to the first connecting portion 304, thereby guaranteeing the current-carrying capacity between the first electrode 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 tab 202 is at least partially electrically connected to the first surface 301 of the second connecting portion 305, the end of the second tab 202 extends beyond the inner edge of the second connecting portion 305. This arrangement ensures that the electrical connection area (welding area) between the second tab 202 and the second connecting portion 305 is sufficient, ensuring that all the second tabs 202 are welded to the second connecting portion 305, thereby guaranteeing the current-carrying capacity between the second tab 202 and the second connecting portion 305.

[0073] It should be noted that after the first tab 102 and the second tab 202 are wound around the first surface 301, they will both form a staggered structure. The shortest part of the first tab 102 should be at least flush with the inner edge of the first connecting part 304. Similarly, the shortest part of the second tab 202 should be at least flush with the inner edge of the second connecting part 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 102 and the root of the second electrode 202, and the distance b between the end of the first electrode 102 and the end of the second electrode 202, satisfy: 10mm≤ab≤55mm.

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

[0077] Since the end of the first tab 102 extends beyond the inner edge of the first connecting portion 304, and the end of the second tab 202 extends beyond the inner edge of the second connecting portion 305, both the first tab 102 and the second tab 202 are relatively close to the pole post 4. Therefore, the range of "ab" needs to be narrowed to avoid the first tab 102 and the second tab 202 being too close to the pole post 4. This ensures that the ends of the first tab 102 and the second tab 202 are not easily placed in the gap between the pole post 4 and the adapter 3, and that the pole post 4 and the adapter 3 are not easily mis-welded. This ensures the welding quality of the pole post 4 and the adapter 3 and guarantees the current carrying capacity between the pole post 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, the ratio of the distance d between the first connecting part 304 and the second connecting part 305 to the width e of the adapter 3 is 0.2≤d / e≤0.8.

[0080] If the "d / e" ratio is too small, the convergence space of the first tab 102 and the second tab 202 will be small, and the setting of the first tab 102 and the second tab 202 will be affected. If the "d / e" ratio 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 tab 102 and the pole post 4, and between the second tab 202 and the pole post 4, resulting in a slower tab current transmission rate.

[0081] like Figure 8 As shown, in this embodiment, the ratio of "d / e" is in the range of 0.2≤d / e≤0.8. Within the above range, the convergence space of the first tab 102 and the second tab 202 will not be too small, and the area of ​​the first connecting part 304 and the second connecting part 305 can be ensured to ensure the transmission rate of the 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 interval d between the first connecting part 304 and the second connecting part 305 is in the range of 5mm ≤ d ≤ 30mm, for example, the interval d can be 5mm, 12mm, 25mm, etc. The width e of the adapter 3 is in the range of 15mm ≤ e ≤ 70mm, for example, the width e can be 15mm, 22mm, 35mm, 46mm, 55mm, 67mm, 70mm, etc.

[0084] Furthermore, 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 fusible structure, which is located between the first tab connection area and the pole connection area, and between the second 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, the adapter 3 is also provided with a fuse structure, which is located between the first tab connection area and the terminal post connection area, and between the second tab connection area and the terminal post connection area. The main function of this fuse structure is overcurrent protection. When the current of the battery system exceeds the design threshold due to short circuit, overcharge, over-discharge, or external fault, the battery generates a large amount of heat. The fuse structure will quickly melt and cut off the circuit to prevent the battery pack from thermal runaway or permanent damage due to continuous high current. Specifically, the fuse structure forms a weak area by thinning or setting notches or through holes, so that when there is an internal abnormality in the battery during charging and discharging, the fuse structure can quickly generate heat and concentrate, further disconnecting the current between the tab and the terminal post, that is, disconnecting the current between the cell output terminal and the battery output terminal.

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

[0087] like Figures 8-9 As shown, in this embodiment, the fusible link structure is a fusible elongated hole 306. There are two fusible elongated holes 306, one on each of the first connecting portion 304 and the second connecting portion 305, to ensure that the current to both cells is completely disconnected when an abnormal current occurs. When the current is too high, adjacent portions of the fusible elongated holes 306 melt, thereby cutting off the electrical connection between the tab and the terminal 4 and protecting the safety of the battery system.

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

[0089] In this embodiment, because the adapter 3 is provided with a fusible structure, the area on the adapter 3 that can be electrically connected to the first tab 102 and the second tab 202 is reduced. Therefore, the range of "ab" needs to be narrowed to avoid the first tab 102 and the pole post 4 overlapping too closely, and the second tab 202 and the pole post 4 overlapping too closely. This ensures that the ends of the first tab 102 and the second tab 202 are not easily placed in the gap between the pole post 4 and the adapter 3, ensures the welding quality between the pole post 4 and the adapter 3, ensures the current carrying capacity between the pole post 4 and the adapter 3, and ensures the effectiveness of the fusible structure. At the same time, it ensures that the first tab 102 and the adapter 3 have sufficient electrical connection area to ensure the current carrying capacity. Similarly, it ensures that the second tab 202 and the adapter 3 have sufficient electrical connection area to ensure the current carrying 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, with a fuse structure disposed on the positive adapter 302; the first tab 102 includes a first positive tab 1021 and a first negative tab 1022, and the second tab 202 includes a second positive tab 2021 and a second negative tab 2022. The first positive tab 1021 and the second positive tab 2021 are electrically connected to the positive adapter 302, and the first negative tab 1022 and the second negative tab 2022 are electrically connected to the negative adapter 302. 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 in this embodiment is a dual-cell battery, with each cell having a positive electrode tab and a negative electrode tab. Specifically, the first electrode tab 102 of the first cell 1 includes a first positive electrode tab 1021 and a first negative electrode tab 1022, and the second electrode tab 202 of the second cell 2 includes a second positive electrode tab 2021 and a second negative electrode tab 2022.

[0093] The adapter 3 includes a positive adapter 302 and a negative adapter 303. The positive adapter 302 is electrically connected to the positive tabs of the two battery cells, and the negative adapter 303 is electrically connected to the negative tabs of the two battery cells. Specifically, the first positive tab 1021 and the second positive tab 2021 are electrically connected to the positive adapter 302, and the first negative tab 1022 and the second negative tab 2022 are electrically connected to the negative adapter 303. Furthermore, the fuse structure of the adapter 3 is provided in the 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, the distance between the end of the first positive electrode tab 1021 and the end of the second positive electrode tab 2021 is b1, and the distance between the root of the first negative electrode tab 1022 and the root of the second negative electrode tab 2022 is a2, 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 fusible link structure is set on the positive electrode adapter 302, while the negative electrode adapter 303 does not have a fusible link structure. Furthermore, the positive electrode adapter 302 has a lower melting point. 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 tab (first positive electrode tab 1021 and second positive electrode tab 2021) and the positive electrode adapter 302 is smaller, i.e., 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 a connector protrusion 3011 protruding toward the pole 4.

[0096] To further improve structural reliability and ensure that both the first tab 102 and the second tab 202 maintain a certain distance from the pole post 4, preventing overlap between them, a pole post connection area is provided on the first surface 301. During welding of the pole post 4 to the first surface 301, the pole post 4 is welded to this connection area. Furthermore, a transition protrusion 3011 is provided in this connection area, such as... Figure 5 As shown, the adapter protrusion 3011 protrudes toward the direction in which the pole post 4 is positioned. Optionally, the adapter protrusion 3011 smoothly transitions with other portions of the first surface 301.

[0097] When the battery is installed vertically, the height of the adapter protrusion 3011 is higher than the height of other parts of the first surface 301. The terminal 4 is electrically connected to the adapter protrusion 3011, and the first tab 102 is electrically connected to other positions on the first surface 301. This increases the distance between the first tab 102, the second tab 202 and the terminal 4 in the height direction, increasing the installation space of the first tab 102 and the second tab 202 on the first surface 301 of the adapter 3. This further ensures that the first tab 102 and the second tab 202 maintain a sufficient distance from the terminal 4, avoiding overlap between the first tab 102 and the second tab 202 and the terminal 4. This prevents the first tab 102 and the second tab 202 from being inserted into the gap between the terminal 4 and the adapter 3, and avoids the problem of poor soldering between the terminal 4 and the adapter 3. This ensures the welding quality between the terminal 4 and the adapter 3 and guarantees the current carrying capacity between the terminal 4 and the adapter 3. Furthermore, the position where the pole post 4 and the adapter 3 are electrically connected should be in planar contact to facilitate welding of the pole post 4 and the adapter 3 and to ensure the welding quality of the pole post 4 and the adapter 3. By setting the adapter protrusion 3011 in the pole connection area of ​​the adapter 3, only the flatness of the adapter protrusion 3011 position can be guaranteed, thereby reducing the processing difficulty and ensuring the welding quality of the pole post 4 and the adapter 3.

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

[0099] The pole connection area is provided with a connector protrusion 3011 protruding towards the pole 4. At this time, the range of "ab" is narrowed to avoid the first tab 102 and the pole 4 overlapping too closely, and the second tab 202 and the pole 4 overlapping too closely. This ensures that the ends of the first tab 102 and the second tab 202 are not easily placed in the gap between the pole 4 and the connector 3, ensuring the welding quality of the pole 4 and the connector 3, ensuring the current carrying capacity between the pole 4 and the connector 3, and ensuring the effectiveness of the fusion structure. At the same time, it ensures that the first tab 102 and the connector 3 have sufficient electrical connection area to ensure the current carrying capacity. Similarly, it ensures that the second tab 202 and the connector 3 have sufficient electrical connection area to ensure the current carrying capacity.

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

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

[0102] If the height of the protrusion 3011 of the adapter protruding towards the pole post 4 is too small, the first tab 102, the second tab 202 and the pole post 4 will easily overlap, affecting the welding quality of the pole post 4 and the adapter 3. If the height of the protrusion 3011 of the adapter protruding towards the pole post 4 is too large, the current transmission path between the cell and the pole post 4 will be longer and the transmission rate will be slower.

[0103] In this embodiment, the height of the adapter protrusion 3011 protruding towards the terminal post 4 is in the range of 0.3mm to 1mm. Within this range, the height of the adapter protrusion 3011 protruding towards the terminal post 4 is neither too large nor too small, thus preventing the first tab 102 and the second tab 202 from overlapping with the terminal post 4. This also ensures the transmission rate between the battery cell and the terminal post 4.

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

[0105] Furthermore, the outer periphery of the adapter protrusion 3011 extends beyond the outer periphery of the bottom surface of the pole post 4 near the end of the first pole tab 102 or the end of the second pole tab 202.

[0106] The above settings can further increase the distance between the end of the first electrode tab 102 and the electrode post 4, as well as the distance between the end of the second electrode tab 202 and the electrode post 4, to prevent the end of the first electrode tab 102 or the end of the second electrode tab 202 from being inserted between the electrode post 4 and the adapter 3, thus ensuring the welding quality of the electrode post 4 and the adapter 3.

[0107] Furthermore, the top surface area of ​​the adapter protrusion 3011 is S1, and the bottom surface area of ​​the pole post 4 is S2, satisfying: 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 will be too small, which will not be conducive to the overcurrent between the two, affect the transmission efficiency, and easily cause problems such as local overheating. If the ratio of "s1 / s2" is too large, the area of ​​the adapter protrusion 3011 will be too large, resulting in the welding area between the first pole 102 and the adapter 3, and between the second pole 202 and the adapter 3 being too small, which will affect the overall current transmission.

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

[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 50mm². 2 120mm 2 260mm 2 330mm 2 450mm 2 500mm 2 The base area S2 of pole post 4 ranges from 40 mm². 2 ≤s2≤300mm 2 For example, the bottom area S2 of pole post 4 can be 40mm². 2 130mm 2 260mm 2 300mm 2 wait.

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

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

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

[0115] In other embodiments, the outer periphery of the adapter protrusion 3011 near the end of the first electrode 102 or the end of the second electrode 202 may not extend beyond the outer periphery of the bottom surface of the pole post 4. In this case, the top surface area S1 of the adapter protrusion 3011 is less than or equal to the bottom surface area S2 of the pole post 4, so as to further increase the distance between the end of the first electrode 102 and the bottom surface of the pole post 4, or increase the distance between the end of the second electrode 202 and the bottom surface of the pole post 4, so as to avoid the electrode 102 being inserted between the pole post 4 and the adapter 3, and to ensure the welding quality of the pole post 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 post 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 terminal post 4 and the first tab 102 and the second tab 202 increases. Furthermore, the area of ​​the adapter protrusion 3011 of the adapter 3 is smaller than the cross-sectional area of ​​the terminal post 4, creating a bottleneck for current flow between them and resulting in a slow current transmission rate. In this situation, the distance 'a' between the root of the first tab 102 and the root of the second tab 202, and the distance 'b' between the end of the first tab 102 and the end of the second tab 202, must satisfy: 15mm ≤ ab ≤ 55mm. By narrowing the range of "ab", the overall current flow capacity of the battery is improved, ensuring the welding yield of the terminal post 4 and the adapter 3, and avoiding risks such as incomplete or poor welding.

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

[0119] Furthermore, the battery also includes a housing 6, on which a through hole is provided, and the adapter protrusion 3011 is at least partially disposed within the through hole.

[0120] The housing 6 has a through hole for accommodating at least a portion of the terminal post 4 to enable outward current output. The adapter protrusion 3011 is at least partially disposed within the through hole to achieve a compact structure and improve the utilization of the battery's internal space. This can be achieved by placing a portion of the adapter protrusion 3011 within the through hole, or by placing the entire adapter protrusion 3011 within the through hole.

[0121] The above configuration reduces the risk of overlap between the first tab 102, the second tab 202, and the terminal 4, ensuring a high welding yield for the terminal 4 and the adapter 3. At this point, the distance 'a' between the root of the first tab 102 and the root of the second tab 202, and the distance 'b' between the end of the first tab 102 and the end of the second tab 202, satisfy: 23mm ≤ ab ≤ 65mm. The narrowing of the value range of "ab" shortens the battery current transmission path and improves the battery's charge and discharge rate.

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

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

[0124] The electrode post 4 is electrically connected to the first surface 301. The electrode post 4 has a connection end 401, which is disposed facing the first surface 301. The electrode post 4 is electrically connected to the first surface 301 through the connection end 401. In this embodiment, a stepped structure is formed on the edge of the connection end 401. The stepped structure is further away from the first surface 301 than other parts of the connection end 401.

[0125] like Figures 5-6 As shown, in this embodiment, the stepped structure includes a stepped surface 402. The step surface 402 is formed by creating a notch at the edge of the connecting end 401. Optionally, the notch is provided around the edge of the pole connecting end 401, thereby reducing the size of the original end face of the connecting end 401. The top surface of the notch forms the stepped surface 402, which is parallel to the end face of the connecting end 401. At this time, compared with the end face of the connecting end 401, the stepped surface 402 is farther from the first surface 301.

[0126] By setting this stepped structure, the end face size of the connection end 401 is reduced, further increasing the distance between the first tab 102 and the terminal post 4, as well as the distance between the second tab 202 and the terminal post 4, improving structural reliability. This further ensures that the first tab 102 and the second tab 202 are not easily placed between the terminal post 4 and the adapter 3. When the terminal post 4 and the adapter 3 are welded, the first tab 102 and the second tab 202 will not be inserted into the gap between the terminal post 4 and the adapter 3, thus avoiding the problem of poor welding between the terminal post 4 and the adapter 3. This ensures the welding quality between the terminal post 4 and the adapter 3, guarantees the current carrying capacity between the terminal post 4 and the adapter 3, and prevents the first tab 102 and the second tab 202 from overlapping with the terminal post 4. This prevents the failure of the fuse structure of the adapter 3, ensures that the fuse structure can function, avoids thermal runaway of the battery, and reduces safety risks.

[0127] Furthermore, the battery also includes an insulating member 5, which is disposed on the side of the first tab 102 and the second tab 202 facing away from the adapter 3. The position where the first tab 102 and the second tab 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 positions corresponding to the positions of the electrical connection areas of the first tab 102 and the second tab 202. The insulating member protrusion 501 protrudes in a direction away from the first tab 102 and the second tab 202.

[0128] like Figures 5-6As shown, the battery also includes an insulating component 5, which is disposed on the side of the first tab 102 and the second tab 202 facing away from the adapter 3. When the battery is arranged vertically, the insulating component 5 is positioned above the first tab 102 and the second tab 202. The insulating component 5 is mainly used to isolate the tabs from direct contact with the battery cover, avoiding the risk of short circuit. The insulating component 5 is made of insulating material, such as plastic.

[0129] The position on the first tab 102 that is electrically connected to the adapter 3 is the electrical connection area. Similarly, the position on the second 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 corresponding to the positions of the electrical connection areas of the first tab 102 and the second tab 202. The insulating member protrusion 501 protrudes in a direction away from the first tab 102 and the second tab 202. The first tab 102 and the second tab 202 located on the first surface 301 inevitably have some curled parts. By setting the insulating protrusion 501, more space can be provided for the first tab 102 and the second tab 202 in the battery height direction. This avoids the first tab 102 and the second tab 202 being closer to the pole post 4 due to the insulating member 5 squeezing the first tab 102 and the second tab 202 in the battery height direction. This further ensures that the ends of the first tab 102 and the second tab 202 are not placed between the pole post 4 and the adapter 3, and will not cause the pole post 4 and the adapter 3 to form a poor weld. This ensures the welding quality of the pole post 4 and the adapter 3, thereby ensuring the current carrying capacity between the pole post 4 and the adapter 3. At the same time, it avoids the problem of failure of the fused structure on the adapter 3 due to the first tab 102 and the second tab 202 overlapping with the pole post 4.

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

[0131] In this embodiment, the positive and negative tabs of the first cell 1 are led out from the same end. Specifically, the first positive tab 1021 and the first negative tab 1022 are led out from the same end of the first cell 1. Similarly, the positive and negative tabs of the first cell 1 are led out from the same end. Specifically, the second positive tab 2021 and the second negative tab 2022 are led out from the same end of the second cell 2. That is to say, all the tabs of the first cell 1 and the second cell 2 are led out from the same end. At this time, the overcurrent 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 charging and discharging 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 post 4, and the distance between the end of the second electrode tab 202 and the outer periphery of the electrode post 4 are both L, satisfying: 0.5mm≤L≤10mm.

[0134] like Figure 3 As shown, there is a certain distance, L, between the end of the first tab 102 and the outer periphery of the terminal post 4. If the distance L is too small, the first tab 102 and the terminal post 4 will easily overlap too closely, and the second tab 202 and the terminal post 4 will easily overlap too closely. If the distance L is too large, the battery size will be increased and the space utilization rate will be reduced.

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

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

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

[0138] The single battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment is not limited to this. A single battery cell typically includes a battery casing, a cell, an adapter plate, and an electrolyte. The battery casing is used to house the cell and electrolyte, and generally includes a casing body and a cover plate. At least one positive electrode post and at least one negative electrode post are disposed on the casing and / or the cover plate. The cell includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and a separator. The separator is located between adjacent positive and negative electrode plates to insulate them. At least one end of the electrode assembly has a tab, and one end of the adapter plate is electrically connected to the tab, while the other end is electrically connected to the electrode post.

[0139] Taking a wound cell as an example, the specific manufacturing process is as follows: A positive electrode, a negative electrode, and a separator are wound to form an electrode assembly, with a tab extending from one end of the assembly. When the tab is fixed to the adapter plate, the electrode assembly and the tab are first placed along the tab extension direction. Then, the tab of the electrode assembly is welded to the tab welding area of ​​the adapter plate. Subsequently, the adapter plate and the electrode post on the cover plate are welded to the electrode post welding area of ​​the adapter plate. After welding, the electrode post and the tab are located on the same side in the thickness direction of the adapter plate. Then, the electrode assembly is folded along the connection position between the tab and the electrode assembly, so that the electrode assembly and the electrode post are located on opposite sides in the thickness direction of the adapter plate. The folded electrode assembly is then inserted into the casing, and the cover plate is welded and sealed to the battery casing body. Liquid is injected, formation is performed, and the injection hole is sealed to obtain a single-cell battery.

[0140] The following describes the testing process for the battery's overcurrent capability:

[0141] For each embodiment and comparative example, 10 batteries were taken. The distance between the root of the first tab and the root of the second tab was set as a, and the distance between the end of the first tab and the end of the second tab was set as b, according to the table below. All other characteristics of the battery cells were the same. The battery was discharged at 0.33C to 0% SOC and left to stand for 60 minutes. The temperature at this time was measured and recorded as t1. The battery was charged at 1C to 100% SOC and the time was recorded as T. 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 testing process for the welding strength between battery terminal 4 and adapter 3:

[0143] For each embodiment and comparative example, 10 batteries were taken. The distance between the root of the first electrode tab and the root of the second electrode tab was set as 'a', and the distance between the end of the first electrode tab and the end of the second electrode tab was set as 'b', according to the table below. All other characteristics of the battery cells were the same. A universal tensile testing machine was used to test the peel strength at 90° between the electrode and the adapter with one end fixed and the other end fixed. 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 were conducted on the battery's overcurrent capacity (temperature rise rate) and the welding strength between the adapter and the terminal:

[0145]

[0146]

[0147] As can be seen from the table above, for Examples 1-14, 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 overcurrent capacity of the battery meets the requirements, the tensile force between the adapter 3 and the terminal 4 is greater than 400N, and the welding strength between the adapter 3 and the terminal 4 is high and meets the welding strength requirements.

[0148] For Comparative Examples 1-6, when the value of "ab" exceeds the range of 10mm to 65mm, the battery's overcurrent capacity and the high welding strength between adapter 3 and terminal 4 do not meet the requirements. When the value of "ab" is too small, the tensile strength (peel strength) between adapter 3 and terminal 4 is less than 400N, indicating insufficient welding strength, and the battery temperature rise is large, thus the battery's overcurrent capacity does not meet the requirements. When the value of "ab" is too large, although the tensile strength (peel strength) between adapter 3 and terminal 4 is greater than 400N and the welding strength 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, including a housing and the aforementioned batteries, wherein at least two batteries are provided, and the housing is used to accommodate at least two batteries. This electrical device can be used in passenger cars, commercial vehicles, energy storage devices, electric ships, aircraft, laptops, and other similar applications.

[0150] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: The first battery cell (1) includes a first battery cell body (101) and a first electrode (102). The first electrode (102) extends from the first battery cell body (101) and includes a root connected to the first battery cell body (101) and an end away from the first battery cell body (101). The second battery cell (2) includes a second battery cell body (201) and a second electrode (202). The second electrode (202) extends from the end of the second battery cell body (201). The second electrode (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). The end of the first battery cell (1) from which the first tab (102) is drawn is on the same side as the end of the second battery cell (2) from which the second tab (202) is drawn; and the first tab (102) and the second tab (202) have the same polarity; The adapter (3) has a first electrode (102) and a second electrode (202) at least partially disposed on the upper part of a first surface (301) of the adapter (3) and electrically connected to the first surface (301). The first surface (301) is disposed away from the first cell body (101) and the second cell body (201). The first surface (301) has a pole post connection area, and a portion of the pole post connection area is disposed opposite to the end of the first electrode (102) and the end of the second electrode (202). The electrode post (4) is electrically connected to the electrode post connection area; On the first surface (301), along the width direction of the battery, 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, satisfying: 10mm≤ab≤65mm; The distance between the end of the first electrode tab (102) and the outer periphery of the pole post (4), and the distance between the end of the second electrode tab (202) and the outer periphery of the pole post (4) are both L, satisfying: 0.5mm≤L≤10mm.

2. The battery according to claim 1, characterized in that, The distance between the root of the first electrode (102) and the end of the first electrode (102) is c1, and the distance between the root of the second electrode (202) and the end of the second electrode (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 tab (102) is at least partially electrically connected to the first surface (301) of the first connecting portion (304), and the second tab (202) is at least partially electrically connected to the first surface (301) of the second connecting portion (305). The first connecting portion (304) and the second connecting portion (305) are spaced apart along the width direction of the battery.

4. The battery according to claim 3, characterized in that, The end of the first tab (102) extends beyond the inner edge of the first connecting portion (304); and / or, the end of the second 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 electrode (102) and the root of the second electrode (202), and the distance b between the end of the first electrode (102) and the end of the second electrode (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 distance d between the first connecting part (304) and the second connecting part (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 fusible structure, which is located 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 electrode (102) and the root of the second electrode (202), and the distance b between the end of the first electrode (102) and the end of the second electrode (202) satisfy: 18mm≤ab≤65mm.

9. The battery according to claim 7, characterized in that, The fusible link structure includes at least two, and the at least two fusible link structures are respectively disposed on the first connecting part (304) and the second connecting part (305).

10. The battery according to claim 7, characterized in that, The adapter (3) includes a positive electrode adapter (302) and a negative electrode adapter (303), and the fuse structure is disposed on the positive electrode adapter (302). The first electrode (102) includes a first positive electrode (1021) and a first negative electrode (1022), and the second electrode (202) includes a second positive electrode (2021) and a second negative electrode (2022). The first positive electrode (1021) and the second positive electrode (2021) are electrically connected to the positive electrode adapter (302), and the first negative electrode (1022) and the second negative electrode (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 disposed on the first surface (301), and the pole connection area is provided with a connector 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 electrode (102) and the root of the second electrode (202), and the distance b between the end of the first electrode (102) and the end of the second electrode (202) satisfy: 20mm≤ab≤55mm.

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

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

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

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

17. The battery according to claim 11, characterized in that, The protrusion (3011) of the adapter is located near the end of the first electrode (102) or the end of the second electrode (202) and does not extend beyond the outer periphery of the bottom surface of the pole post (4).

18. The battery according to claim 17, characterized in that, The top surface area of ​​the adapter protrusion (3011) is S1, and the bottom surface area of ​​the pole (4) is S2, satisfying: 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 electrode (102) and the root of the second electrode (202), and the distance b between the end of the first electrode (102) and the end of the second electrode (202) satisfy: 15mm≤ab≤55mm.

20. The battery according to claim 11, characterized in that, It also includes a housing (6) having a through hole, and the adapter protrusion (3011) is at least partially disposed within the through hole.

21. The battery according to claim 20, characterized in that, The distance a between the root of the first electrode (102) and the root of the second electrode (202), and the distance b between the end of the first electrode (102) and the end of the second electrode (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 the edge of the connection end (401) is formed with a stepped structure, which is further 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 (102) and the root of the second electrode (202) satisfies: 30mm≤a≤80mm.

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

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

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

27. An electrical appliance, characterized in that, It includes at least two of the batteries according to any one of claims 1-26, and a housing for accommodating the at least two of the batteries.

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