Battery, battery pack and electric device

Abstract

The utility model provides a kind of battery, battery pack and electric equipment, the battery includes multiple electric core, each the electric core includes pole, the pole includes main part and extension, the extension is connected to the main part;Connection row, the connection row is set to connect the pole of two adjacent electric core;Wherein, the connection row is set to with the extension of the pole can be detached connection.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery, a battery pack, and an electrical device. Background Technology

[0002] In related technologies, battery packs include multiple cells and multiple connectors. Each connector is configured to connect the positive and negative terminals of two adjacent cells. The connectors and the terminals of the cells are often fixedly connected by laser welding, which makes subsequent repair and replacement inconvenient. Utility Model Content

[0003] The embodiments of this utility model provide a battery, a battery pack, and an electrical device, which can improve the technical problem that the connection method between the connector and the cell terminal is inconvenient for maintenance.

[0004] In a first aspect, embodiments of the present invention provide a battery, the battery comprising:

[0005] Multiple battery cells, each of the battery cells including a terminal post, the terminal post including a main body and an extension, the extension being connected to the main body;

[0006] A connecting bar is configured to connect the terminals of two adjacent battery cells; wherein the connecting bar is configured to be detachably connected to the extension portion of the terminal.

[0007] By setting the connector to be detachably connected to the extension of the cell's terminal, it is easy to disconnect the connector from the cell's terminal, which facilitates maintenance and reduces damage to the cell and connector during maintenance.

[0008] In one embodiment, the extension includes a first connecting portion and a second connecting portion spaced apart, the connecting row includes a first mating portion and a second mating portion spaced apart, and the battery pack further includes two connectors, one of which connects the first connecting portion and the first mating portion, and the other connector connects the second connecting portion and the second mating portion.

[0009] By providing a first connecting portion and a second connecting portion at intervals on the extension, and correspondingly providing a first mating portion and a second mating portion at intervals on the connecting busbar, and connecting the first connecting portion and the first mating portion with a first connector, and connecting the second connecting portion and the second mating portion with a second connector, a stable connection is formed between the connecting busbar and the terminal of each cell. Simultaneously, sufficient contact area is formed between the connecting busbar and the extension of the terminal of each cell, thereby meeting the overcurrent requirements.

[0010] In one embodiment, the first connecting portion and the second connecting portion are located on the same side of the main body. By placing the first connecting portion and the second connecting portion on the same side of the main body, it is convenient to quickly fix and disassemble the extension of the pole post and the connecting bar.

[0011] Alternatively, the first connecting part and the second connecting part are located on both sides of the main body, and the extension part extends toward both sides of the main body. By placing the first connecting part and the second connecting part on both sides of the main body, the first connecting member connects the first connecting part and the first mating part, and the second connecting member connects the second connecting part and the second mating part. During this process, the extension part and the main body are subjected to more balanced forces, thus preventing the extension part from deforming during the connection process.

[0012] In one embodiment, the extension includes a base portion and a fixing post protruding from one end of the base portion. Both the first connecting portion and the second connecting portion include a pole fixing hole, which penetrates the base portion and the fixing post.

[0013] By providing a protruding fixing post in the extension of the electrode post, it is beneficial to increase the fixing depth of the first and second connectors in the electrode post, and to prevent the first and second connectors from becoming loose from the electrode post and the connecting bar under severe vibration conditions.

[0014] In one embodiment, both the first mating part and the second mating part include a connecting row fixing hole, the diameter of which is greater than or equal to the diameter of the pole fixing hole, thereby facilitating the first connector to pass through the connecting row fixing hole and form a tight fit with the pole fixing hole, and the second connector to pass through the connecting row fixing hole and form a tight fit with the pole fixing hole.

[0015] In one embodiment, the battery further includes an insulating member disposed on the top surface of the battery cell, and the distance between the bottom surface of the fixing post and the insulating member is 0.01 mm to 10 mm.

[0016] When the distance d between the bottom surface of the fixing post of the extension of the terminal post and the insulating component is less than 0.01 mm, the first connector may pass through the first connection portion and contact the insulating component, potentially damaging the insulating component and the battery cell; similarly, the second connector may pass through the second connection portion and contact the insulating component, potentially damaging the insulating component and the battery cell. When the distance d between the bottom surface of the fixing post of the extension of the terminal post and the insulating component is greater than 10 mm, it will occupy more space at the top of the battery, which is detrimental to the miniaturization design of the battery and the improvement of the battery's energy density.

[0017] In one embodiment, the extension portion is arranged at an angle to the main body portion. By configuring the extension portion of the terminal post at an angle to the main body portion, it is beneficial to maximize the surface area of ​​the extension portion and thus increase the contact area between the extension portion and the connector bar while minimizing the space occupied inside the battery.

[0018] In one embodiment, the extension includes a base portion and a fixing post protruding from one end relative to the base portion. The height of the main body portion is set to h1, the height of the base portion is h2, and the height of the fixing post is h3, where h1:h2 = 2 to 5. It is understood that if h1:h2 is less than 2, it will affect the design space of the fixing post in the extension, thus affecting the connection effect between the extension of the electrode post and the connecting bar. If h1:h2 is greater than 5, it will increase the overall height space occupied by the electrode post within the battery pack, which is detrimental to cost control and also hinders the improvement of the integrated space occupied by the battery pack in the energy storage system.

[0019] In one embodiment, the height of the fixing post is set to h3, h1 is greater than h3, and h1 is not greater than 15mm. The height difference between h1 and h3 can be 1mm, 1.5mm, or 2mm, which helps to increase the height space of the fixing post in the extension. At the same time, setting h1 to not greater than 15mm helps to reduce the occupation of the height space inside the battery pack by the electrode post, thereby improving the energy density of the battery pack.

[0020] In one embodiment, 2mm≤h2≤5mm, it is understood that the height h2 of the base portion of the extension determines the structural strength of the extension. If the height h2 of the base portion of the extension is less than 2mm, the overall structural strength of the extension will be weak. If the height h2 of the base portion of the extension is set to be greater than 5mm, the overall height space occupied by the pole post inside the battery pack will increase, which is not conducive to cost control and is not conducive to improving the integration space occupied by the battery pack in the energy storage system.

[0021] In one embodiment, the height of the fixing post is set to h3, where 2mm ≤ h3 ≤ 5mm. It is understood that the height h3 of the fixing post of the extension of the electrode determines the connection strength between the extension and the connecting bar. For example, when the extension and the connecting bar are connected by threads, if the height h3 of the fixing post of the extension is less than 2mm, the thread engagement length inside the fixing post of the extension will be short, that is, the number of thread engagement turns will be too small, which will result in a weak connection strength between the extension and the connecting bar. If the height h3 of the fixing post of the extension is set to greater than 5mm, the overall height space occupied by the electrode in the battery pack will increase, which is not conducive to cost control and is not conducive to improving the integration space occupied by the battery pack in the energy storage system.

[0022] In one embodiment, the length of the extension is L, where 15mm ≤ L ≤ 50mm. It is understood that if the length L of the extension is less than 15mm, it will affect the contact area between the extension and the connector, thus affecting the current carrying capacity of the battery cell. Furthermore, the extension also has a fixing hole; if the length L is less than 15mm, the hole diameter will be too small, affecting the connection strength between the extension and the connector. If the length L is greater than 50mm, it is inconvenient for the electrode to be processed and formed, and it is not conducive to reducing the cost of the battery cell.

[0023] In one embodiment, each of the battery cells includes a positive terminal and a negative terminal disposed on the top surface of the battery cell, the extension of the positive terminal extending toward one side of the main body, and the extension of the negative terminal extending toward the other side of the main body.

[0024] By extending the positive and negative terminals of the battery cell in opposite directions, it is easier to quickly identify and improve assembly efficiency when connecting the positive and negative terminals of adjacent battery cells.

[0025] In one embodiment, the connector is configured to cover the surface of the extension so that a sufficient contact area is formed between the connector and the terminal of the battery cell, thereby meeting the overcurrent requirements of the battery cell.

[0026] In one embodiment, the cross-section of the connecting bar is rectangular, and the corners of the connecting bar include rounded corners. On the one hand, by making the four corners of the connecting bar rounded, the formation of a tip discharge effect is avoided. On the other hand, by making the connecting bar square, the manufacturing cost of the connecting bar can be reduced, and the impact on the current-carrying area of ​​the connecting bar is minimal.

[0027] In one embodiment, the overlap area between the extension of the electrode post and the connecting bar is set to S, the maximum operating current of the battery cell is I, the current density of the battery cell is J, and S = I / J.

[0028] Secondly, embodiments of the present invention provide a battery pack, the battery pack including a housing and a plurality of batteries disposed within the housing, the batteries including those described above.

[0029] Thirdly, embodiments of this utility model provide an electrical device, which includes the battery as described above, or the electrical device includes the battery pack as described above.

[0030] The beneficial effects of the embodiments of this utility model are as follows:

[0031] In embodiments of this utility model, by setting the connecting bar to be detachably connected to the extension of the battery cell's terminal post, it is convenient to disassemble the connecting bar and the battery cell's terminal post, thereby facilitating maintenance and reducing damage to the battery cell and connecting bar during maintenance. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a perspective view of the battery pack provided in an embodiment of the present invention;

[0034] Figure 2a This is a three-dimensional schematic diagram of a battery cell provided in one embodiment of the present invention;

[0035] Figure 2b yes Figure 2a A magnified view of a portion of the image;

[0036] Figure 3 yes Figure 1 A magnified view of a portion of the image;

[0037] Figure 4 This is a three-dimensional schematic diagram of a connecting row provided in one embodiment of the present invention;

[0038] Figure 5 This is a three-dimensional schematic diagram of two battery cells and their corresponding connecting bars connected according to another embodiment of this utility model;

[0039] Figure 6 This is a three-dimensional schematic diagram of a battery cell provided in another embodiment of this utility model;

[0040] Figure 7 This is a perspective view of the connecting row provided in another embodiment of the present utility model;

[0041] Icon labels:

[0042] 100. Battery;

[0043] 1. Battery cell; 10. Terminal post; 11. Positive terminal post; 12. Negative terminal post; 13. Main body; 14. Extension part; 141. First connecting part; 142. Second connecting part; 15. Base part; 16. Fixing post;

[0044] 2. Connecting bar; 21. First mating part; 22. Second mating part; 23. First set of connecting bars; 24. Second set of connecting bars;

[0045] 3. Insulating components;

[0046] 41. First connector; 42. Second connector;

[0047] 5. End plate;

[0048] 6. Fixing strap; Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0050] In related technologies, batteries consist of multiple cells and multiple connectors. Each connector connects the positive and negative terminals of two adjacent cells. The connectors and cell terminals are typically fixed together using laser welding. While laser welding offers high strength, it hinders subsequent repair and replacement, resulting in low repair efficiency and potential damage to both the cells and connectors. Furthermore, laser welding requires sophisticated equipment and involves significant initial investment. Post-welding inspection of the cells and connectors is difficult, making full inspection coverage challenging and preventing 100% monitoring of process quality, thus posing challenges for later traceability.

[0051] This application provides a battery 100, such as Figures 1 to 3 As shown, the battery 100 includes multiple cells 1, multiple connecting bars 2, insulating components 3, end plates 5, and fixing straps 6.

[0052] The battery cell 1 can be a cylindrical cell or a prismatic cell. Taking a prismatic cell as an example, the battery 100 includes multiple cells 1, which are arranged in a matrix to form at least one cell group. Multiple cells 1 within the same cell group are connected in series. Each cell 1 includes a terminal post 10, which is disposed on the top surface of the cell 1 and protrudes from the top surface of the cell 1. The top surface of each cell 1 may have a positive terminal post 11 and a negative terminal post 12, which are spaced apart. The positive terminal post 11 is positioned near a first side of the top surface of the cell 1, and the negative terminal post 12 is positioned near a second side of the top surface of the cell 1, with the first and second sides facing each other.

[0053] The connecting busbar 2 is configured to connect the positive terminal 11 and negative terminal 12 of two adjacent battery cells 1 in series, thereby increasing the voltage of the battery 100. The connecting busbar 2 includes an aluminum busbar, a copper busbar, or a copper-aluminum composite busbar. When the positive terminal 11 and negative terminal 12 are provided on the top surface of the battery cell 1, the multiple connecting busbars 2 are configured into two groups, namely a first group of connecting busbars 23 and a second group of connecting busbars 24. The multiple connecting busbars 2 of the first group of connecting busbars 23 are staggered with the multiple connecting busbars 2 of the second group of connecting busbars 24. Each connecting busbar 2 of the first group of connecting busbars 23 is configured to connect the positive terminal 11 and negative terminal 12 of two adjacent battery cells 1, and each connecting busbar 2 of the second group of connecting busbars 24 is configured to connect the negative terminal 12 and positive terminal 11 of two adjacent battery cells 1.

[0054] An insulating member 3 is disposed on the upper end surface of the battery 100, and a plurality of clearance holes 31 are provided on the insulating member 3. Each clearance hole 31 is configured to allow the terminal post 10 of a battery cell 1 to pass through. The insulating member 3 is configured to provide electrical isolation between the terminal post 10 and the top surface of the battery cell 1, and electrical isolation between the terminal post 10 and the top surface of the end plate 5.

[0055] Two end plates 5 are included, and the two end plates 5 are respectively disposed on opposite sides of the battery 100. The two end plates 5 provide a binding effect along the length direction of the battery 100 for the multiple battery cells 1 arranged along the length direction of the battery 100 through two fixing straps 6. The length direction of the battery 100 is as follows: Figure 1 As shown in the x-direction, the height direction of battery 100 is as follows: Figure 1 The z-direction is shown.

[0056] In the embodiments of this application, such as Figures 2a to 4As shown, the terminal 10 of the battery cell 1 includes an integrally formed main body 13 and an extension 14, with the extension 14 connected to the top of the main body 13. On one hand, the connecting bus 2 is detachably connected to the extension 14 of the terminal 10 of the battery cell 1, facilitating disassembly and reassembly between the connecting bus 2 and the terminal 10 of the battery cell 1. This facilitates maintenance, reduces damage to the battery cell 1 and the connecting bus 2 during maintenance, and extends the service life of the battery cell 1. On the other hand, the area of ​​the main body 13 of the terminal 10 is insufficient. By providing the extension 14 on the main body 13 of the terminal 10, the connection area between the terminal 10 and the connecting bus 2 can be increased, thereby enabling compatibility with high currents and reducing temperature rise under overcurrent conditions.

[0057] In some embodiments, the extension 14 of the terminal post 10 of the battery cell 1 includes a first connecting portion 141 and a second connecting portion 142 spaced apart, the connecting bar 2 includes a first mating portion 21 and a second mating portion 22 spaced apart, and the battery 100 also includes a first connector 41 and a second connector 42, the first connector 41 connecting the first connecting portion 141 and the first mating portion 21, and the second connector 42 connecting the second connecting portion 142 and the second mating portion 22.

[0058] By providing a first connecting portion 141 and a second connecting portion 142 at intervals on the extension 14, and correspondingly providing a first mating portion 21 and a second mating portion 22 at intervals on the connecting bus 2, and connecting the first connecting portion 141 and the first mating portion 21 by a first connecting member 41, and connecting the second connecting portion 142 and the second mating portion 22 by a second connecting member 42, a stable connection is formed between the connecting bus 2 and the terminal post 10 of each battery cell 1. Simultaneously, sufficient contact area is formed between the connecting bus 2 and the extension 14 of the terminal post 10 of each battery cell 1, thereby meeting the overcurrent requirements.

[0059] In one specific embodiment, such as Figure 2a , Figure 2b and Figure 3 As shown, the extension 14 and the main body 13 are configured as an L-shaped connection structure. The extension 14 extends toward one side of the main body 13, and the first connecting part 141 and the second connecting part 142 are located on the same side of the main body 13, which facilitates quick fixing and disassembly between the extension 14 of the pole post 10 and the connecting row 2.

[0060] In another alternative embodiment, such as Figures 5 to 7As shown, the extension 14 and the main body 13 are connected in a T-shape. The extension 14 extends towards both sides of the main body 13, and the first connecting part 141 and the second connecting part 142 are located on both sides of the main body 13, so that the extension 14 and the main body 13 are more evenly stressed during the process of the first connecting member 41 connecting the first connecting part 141 and the first mating part 21, and the second connecting member 42 connecting the second connecting part 142 and the second mating part 22, thus preventing the extension 14 from deforming during the connection process.

[0061] In some embodiments, such as Figure 2a As shown, the extension 14 of the pole post 10 includes a base portion 15 and a fixing post 16. The fixing post 16 protrudes from one end of the base portion 15. The first connecting portion 141 and the second connecting portion 142 both include pole post fixing holes, which are provided through the base portion 15 and the fixing post 16.

[0062] By providing a protruding fixing post 16 in the extension 14 of the pole post 10, it is beneficial to increase the fixing depth of the first connector 41 and the second connector 42 in the pole post 10, and to prevent the battery 100 from becoming loose from the pole post 10 and the connecting row 2 under severe vibration conditions.

[0063] In some embodiments, such as Figure 2a and Figure 2b As shown, the extension 14 of the terminal post 10 is set at an angle to the main body 13. In a specific embodiment, the angle between the extension 14 and the main body 13 of the terminal post 10 can be 90°, 80°, 70°, 50°, 30°, 20°, 10°, or any other angle greater than 0°. By configuring the extension 14 and the main body 13 of the terminal post 10 at an angle, it is beneficial to increase the surface area of ​​the extension 14 as much as possible while reducing the space occupied inside the battery, thereby increasing the contact area between the extension 14 and the connecting bar 2.

[0064] In some embodiments, such as Figure 2a and Figure 2bAs shown, the main body 13 of the electrode post 10 extends to a height h1 along the height direction of the battery cell, the base 15 of the extension 14 extends to a height h2 along the height direction of the battery cell, the fixing post 16 of the extension 14 extends to a height h3 along the height direction of the battery cell, and the length of the extension 14 is L. The length direction of the extension 14 is perpendicular to the height direction of either the extension 14 or the main body 13, and h1:h2 = 2 to 5. It is understandable that if h1:h2 is less than 2, it will affect the design space of the fixing post 16 of the extension 14, thus affecting the connection effect between the extension 14 of the electrode post 10 and the connecting bar 2. If h1:h2 is greater than 5, it will increase the overall height space occupied by the electrode post 10 within the battery pack, which is detrimental to cost control and also hinders the improvement of the integrated space occupied by the battery pack in the energy storage system. In a specific embodiment, h1:h2 can be 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, or any value between any two of the above values, or a range between any two of the above values.

[0065] In some embodiments, such as Figure 2a and Figure 2b As shown, the height h1 of the main body 13 of the terminal post 10 is greater than the height h3 of the fixing post 16 of the extension 14, and h3 is set to be no greater than 15mm. The height difference between h1 and h3 can be 1mm, 1.5mm, or 2mm, which helps to increase the height space of the fixing post 16 of the extension 14. At the same time, setting h1 to be no greater than 15mm helps to reduce the height space occupied by the terminal post 10 inside the battery pack, thereby improving the energy density of the battery pack.

[0066] In some embodiments, such as Figure 2a and Figure 2b As shown, the height h2 of the base portion 15 of the extension portion 14 of the electrode post 10 can range from 2mm to 5mm. It is understood that the height h2 of the base portion 15 of the extension portion 14 determines the structural strength of the extension portion 14. If the height h2 of the base portion 15 of the extension portion 14 is less than 2mm, the overall structural strength of the extension portion 14 will be weak. If the height h2 of the base portion 15 of the extension portion 14 is set to be greater than 5mm, the overall height space occupied by the electrode post 10 inside the battery pack will increase, which is detrimental to cost control and also detrimental to improving the integration space occupied by the battery pack in the energy storage system. In a specific embodiment, the height h2 of the base portion 15 of the extension portion 14 of the electrode post 10 can be 2mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, or any value between any two of the above values, or a range between any two of the above values.

[0067] In some embodiments, such as Figure 2a and Figure 2b As shown, the height h3 of the fixing post 16 of the extension portion 14 of the pole post 10 can range from 2mm to 5mm. It is understandable that the height h3 of the fixing post 16 of the extension portion 14 of the pole post 10 determines the connection strength between the extension portion 14 and the connecting busbar 2. For example, when the extension portion 14 and the connecting busbar 2 are connected by threads, if the height h3 of the fixing post 16 of the extension portion 14 is less than 2mm, the thread engagement length inside the fixing post 16 of the extension portion 14 will be short, i.e., the number of thread engagement turns will be too small, resulting in a weak connection strength between the extension portion 14 and the connecting busbar 2. If the height h3 of the fixing post 16 of the extension portion 14 is set to be greater than 5mm, the overall height space occupied by the pole post 10 inside the battery pack will increase, which is detrimental to cost control and also detrimental to improving the integration space occupied by the battery pack in the energy storage system. In a specific embodiment, the height h3 of the fixing post 16 of the extension 14 of the pole post 10 can be 2mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, or any value between any two of the above values, or a range between any two of the above values.

[0068] In some embodiments, such as Figure 2a and Figure 2b As shown, the length L of the extension 14 of the electrode post 10 can range from 15mm to 50mm. The length direction of the extension 14 can be either the length or width direction of the battery cell, or the length direction of the extension 14 can be at an angle to either the length or width direction of the battery cell. It is understandable that if the length L of the extension 14 of the electrode post 10 is less than 15mm, it will affect the contact area between the extension 14 of the electrode post 10 and the connecting busbar 2, thus affecting the current carrying capacity of the battery cell. Furthermore, the extension 14 of the electrode post 10 also has electrode post fixing holes. If the length L of the extension 14 of the electrode post 10 is less than 15mm, the diameter of the electrode post fixing holes will be too small, thus affecting the connection strength between the extension 14 of the electrode post 10 and the connecting busbar 2. If the length L of the extension 14 of the electrode post 10 is greater than 50mm, it is not convenient for the electrode post 10 to be processed and formed, and it is not conducive to reducing the cost of the battery cell. In specific embodiments, the length L of the extension 14 of the pole post 10 can be 15mm, 20mm, 23mm, 28mm, 30mm, 35mm, 39mm, 45mm, 50mm, or any value between any two of the above values ​​or a range between any two of the above values. These are not listed one by one in the embodiments of this application.

[0069] In some embodiments, the first mating part 21 and the second mating part 22 of the connecting strip 2 both include a connecting strip fixing hole. The diameter of the connecting strip fixing hole is not less than the diameter of the pole fixing hole, so that the first connector 41 passes through the connecting strip fixing hole and forms a tight fit with the pole fixing hole, and the second connector 42 passes through the connecting strip fixing hole and forms a tight fit with the pole fixing hole.

[0070] In one specific embodiment, as shown in Figures 2 to 30, Figure 4 As shown, both the first connector 41 and the second connector 42 include bolts. The first connecting part 141 and the second connecting part 142 of the extension 14 of the pole post 10 are both set as threaded holes. The first mating part 21 and the second mating part 22 of the connecting row 2 are both set as through holes. The first connector 41 passes through the through hole on the connecting row 2 and is detachably connected to the threaded hole inside the extension 14 of the pole post 10.

[0071] In some embodiments, in order to ensure sufficient overlap area between the connecting busbar 2 and the extension 14 of the terminal post 10 of the battery cell 1 to meet the overcurrent requirements, when both the first connector 41 and the second connector 42 are bolts, the bolt specifications can be selected according to the overcurrent requirements of the battery cell 1. For example, the larger the bolt, the larger the overlap area between the connecting busbar 2 and the terminal post 10 of the battery cell 1, and the greater the overcurrent capacity of the battery cell 1.

[0072] This application also provides a bolt selection method in its embodiments, taking the example of both the connecting busbar 2 and the electrode post 10 of the battery cell 1 being made of aluminum. The overlap area S between the extension 14 of the electrode post 10 of the battery cell 1 and the connecting busbar 2 is determined by the maximum operating current I of the battery cell 1 and the maximum allowable current density J of the electrode post 10 of the battery cell 1 or the connecting busbar 2, where S = I / J. When both the connecting busbar 2 and the electrode post 10 of the battery cell 1 are made of aluminum, the soft properties of aluminum can easily lead to increased contact resistance; therefore, the current density is conservatively chosen. Under static conditions, i.e., when the battery cell 1 operates in a stable environment at room temperature, J ≤ 0.8 A / mm². 2 Under dynamic operating conditions, i.e., when cell 1 operates in an environment of vibration or temperature change, J≤0.5A / mm 2 In one embodiment, for example, if the maximum operating current I of the battery cell 1 is set to 500A, then under static conditions, the minimum overlap area S between the connecting bar 2 and the terminal post 10 of the battery cell 1 is 500 / 0.8 = 625mm2.

[0073] In some embodiments, the battery 100 includes an insulating member 3. The bottom end face of the fixing post 16 of the extension 14 of the terminal post 10 is spaced apart from the insulating member 3. The space between the bottom end face of the fixing post 16 of the extension 14 of the terminal post 10 and the insulating member 3 is d, where d satisfies: 0.01mm ≤ d ≤ 10mm. It is understood that when the space d between the bottom end face of the fixing post 16 of the extension 14 of the terminal post 10 and the insulating member 3 is less than 0.01mm, the first connector 41 may pass through the first connector 141 and contact the insulating member 3, potentially damaging the insulating member 3 and the battery cell 1; similarly, the second connector 42 may pass through the second connector 142 and contact the insulating member 3, potentially damaging the insulating member 3 and the battery cell 1. When the space d between the bottom end face of the fixing post 16 of the extension 14 of the terminal post 10 and the insulating member 3 is greater than 10mm, it will occupy more space on the top of the battery 100, which is detrimental to the miniaturization design of the battery 100 and the improvement of the energy density of the battery 100. In a specific embodiment, the distance d between the fixing post 16 of the extension 14 of the electrode post 10 of the battery cell 1 and the insulating member 3 can be 0.01mm, 0.1mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 6.1mm, 7.0mm, 8.5mm, 9.0mm, 10.0mm, or any two of the above values, or any two of the above values.

[0074] In some embodiments, each battery cell 1 includes a positive electrode post 11 and a negative electrode post 12 disposed on the top surface of the battery cell 1. The extension 14 of the positive electrode post 11 extends toward one side of the main body 13, and the extension 14 of the negative electrode post 12 extends toward the other side of the main body 13. By extending the extension 14 of the positive electrode post 11 and the extension 14 of the negative electrode post 12 of the battery cell 1 in opposite directions, the connector 2 can quickly identify the positive electrode post 11 and the negative electrode post 12 of two adjacent battery cells 1 during the process of connecting them, thereby improving assembly efficiency.

[0075] In some embodiments, the connector 2 is configured to cover the surface of the extension 14 of the terminal post 10 so that a sufficient contact area is formed between the connector 2 and the terminal post 10 of the battery cell 1, thereby meeting the overcurrent requirements of the battery cell 1.

[0076] In some embodiments, the cross-sectional shape of the extension 14 of the electrode post 10 is set to a racetrack shape, the cross-sectional shape of the connector 2 is close to square, and the four corners of the connector 2 are rounded. On the one hand, by setting the four corners of the connector 2 to rounded corners, the formation of a tip discharge effect is avoided. On the other hand, by setting the connector 2 to a square shape, the manufacturing cost of the connector 2 can be reduced, and the impact on the current flow area of ​​the connector 2 is small.

[0077] Embodiments of this application also provide a battery pack, which includes multiple batteries and a housing, with the batteries disposed within the housing. The battery pack can be a power battery pack or an energy storage battery pack.

[0078] Embodiments of this application also provide an electrical device that includes the battery pack described above. The electrical device can be an electric vehicle or a power tool. The electric vehicle can be a pure electric vehicle or a hybrid vehicle.

[0079] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery (100), characterized in that, include: Multiple battery cells (1), each of the battery cells (1) includes a terminal (10), the terminal (10) includes a main body (13) and an extension (14), the extension (14) being connected to the main body (13); A connecting bar (2) is configured to connect the poles (10) of two adjacent cells (1); wherein the connecting bar (2) is configured to be detachably connected to the extension (14) of the pole (10).

2. The battery (100) according to claim 1, characterized in that, The extension (14) includes a first connecting portion (141) and a second connecting portion (142) spaced apart. The connecting row (2) includes a first mating portion (21) and a second mating portion (22) spaced apart. The battery also includes a first connector (41) and a second connector (42). The first connector (41) connects the first connecting portion (141) and the first mating portion (21). The second connector (42) connects the second connecting portion (142) and the second mating portion (22).

3. The battery (100) according to claim 2, characterized in that, The first connecting portion (141) and the second connecting portion (142) are located on the same side of the main body portion (13); or, the first connecting portion (141) and the second connecting portion (142) are located on opposite sides of the main body portion (13).

4. The battery (100) according to claim 2, characterized in that, The extension (14) includes a base portion (15) and a fixing post (16) protruding from one end of the base portion (15). The first connecting portion (141) and the second connecting portion (142) both include a pole fixing hole, which is provided through the base portion (15) and the fixing post (16).

5. The battery (100) according to claim 4, characterized in that, Both the first mating part (21) and the second mating part (22) include connecting row fixing holes, the diameter of which is greater than or equal to the diameter of the pole fixing hole.

6. The battery (100) according to claim 5, characterized in that, The battery (100) also includes an insulating member (3), which is disposed on the top surface of the cell (1), and the gap between the bottom surface of the fixing post (16) and the insulating member (3) is 0.01mm to 10mm.

7. The battery (100) according to any one of claims 1 to 6, characterized in that, The extension (14) is set at an angle to the main body (13).

8. The battery (100) according to any one of claims 1 to 3, characterized in that, The extension (14) includes a base portion (15) and a fixing post (16) protruding from one end of the base portion (15). The height of the main body portion (13) is set to h1, the height of the base portion (15) is h2, and the height of the fixing post (16) is h3, where h1:h2 = 2~5; and / or, h1 is greater than h3, and h1 is not greater than 15 mm; and / or, 2mm≤h2≤5mm; and / or, 2mm≤h3≤5mm; and / or, The length of the extension (14) is L, 15mm≤L≤50mm.

9. The battery (100) according to any one of claims 1 to 6, characterized in that, Each of the battery cells (1) includes a positive electrode post (11) and a negative electrode post (12) disposed on the top surface of the battery cell (1). The extension (14) of the positive electrode post (11) extends toward one side of the main body (13), and the extension (14) of the negative electrode post (12) extends toward the other side of the main body (13).

10. The battery (100) according to any one of claims 1 to 6, characterized in that, The connecting bar (2) is configured to cover the surface of the extension (14).

11. The battery (100) according to any one of claims 1 to 6, characterized in that, The cross-section of the connecting row (2) is set to a rectangle, and the corners of the connecting row (2) include rounded corners.

12. The battery (100) according to any one of claims 1 to 6, characterized in that, The overlap area between the extension (14) of the pole (10) and the connecting bar (2) is set to S, the maximum operating current of the cell (1) is I, and the current density of the cell (1) is J, S = I / J.

13. A battery pack, characterized in that, The battery pack includes a housing and a plurality of batteries (100) disposed within the housing, the batteries including the batteries (100) as described in any one of claims 1 to 12.

14. An electrical appliance, characterized in that, The electrical device includes a battery (100) as described in any one of claims 1 to 12, or the electrical device includes a battery pack as described in claim 13.

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