A battery pack, a battery pack and an electrical apparatus

Abstract

The application provides a battery pack, a battery pack and an electric device, and relates to the technical field of batteries. The battery pack comprises: at least two single batteries, the single battery has a first wall, and the first wall is provided with an electrically conductive piece; a bus bar, the bus bar is electrically connected to the electrically conductive piece of the at least two single batteries; wherein, along the thickness direction of the first wall, at least part of the edge of the electrically conductive piece has an avoiding gap d1 mm with the bus bar, the maximum thickness of the bus bar is d2 mm, the maximum thickness of the electrically conductive piece is d3 mm, and d1 / (d2+d3) is 0.012-0.35, so that the collision between the bus bar and the electrically conductive piece can be prevented through the gap between the bus bar and the electrically conductive piece.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack, battery module, and electrical device. Background Technology

[0002] A battery pack typically consists of a group of individual cells connected by busbars. During use, battery packs are subjected to complex external environments, such as vibrations or impacts. These can affect the connections between individual cells, leading to unstable output voltage and impacting the normal operation of the battery pack. Utility Model Content

[0003] This application provides a battery pack, a battery module, and an electrical device to solve the problem that the connection between individual cells is affected when the battery pack is subjected to external vibration or impact.

[0004] In a first aspect, this application provides a battery pack, comprising:

[0005] At least two individual cells, each individual cell having a first wall on which a conductive element is disposed;

[0006] A busbar, wherein the busbar is electrically connected to the conductive element of at least two of the individual cells;

[0007] Wherein, along the thickness direction of the first wall, at least a portion of the edge of the conductive element has a clearance gap d1 with the busbar, the maximum thickness of the busbar is d2mm, the maximum thickness of the conductive element is d3mm, and d1 / (d2+d3) is 0.012-0.35.

[0008] Secondly, this application provides a battery pack including the battery pack described in the first aspect.

[0009] Thirdly, this application provides an electrical device, including an electrical appliance, and a battery pack as described in the first aspect or a battery module as described in the second aspect, wherein the battery pack or the battery module is used to supply power to the electrical appliance.

[0010] The battery pack, battery module, and electrical equipment provided in this application include a battery pack with a busbar and at least two individual cells. Each individual cell has a first wall with conductive elements disposed thereon. The busbar connects the conductive elements of at least two individual cells to achieve series or parallel connection between the individual cells. Along the thickness direction of the first wall, at least a portion of the edge of the conductive element has a clearance gap d1 between it and the busbar. By providing a clearance gap d1 between the busbar and the edge of the conductive element, the probability of collision between the end of the busbar and the edge of the conductive element can be reduced when the battery pack is subjected to external impact and vibration, thereby reducing the probability of busbar deformation and reducing the occurrence of welding failure between the busbar and the conductive element due to busbar deformation.

[0011] In addition, the maximum thickness of the busbar is d2mm, the maximum thickness of the conductive component is d3mm, and d1 / (d2+d3) is 0.012-0.35. Within this range, the value of the clearance d1mm is adapted to the thickness of the busbar and the conductive component, which can further improve the anti-collision effect between the busbar and the conductive component and ensure the strength of the busbar and the conductive component. Attached Figure Description

[0012] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0013] Figure 1 A perspective view of the battery pack provided in an embodiment of this application;

[0014] Figure 2 A top view of the battery pack provided in an embodiment of this application;

[0015] Figure 3 for Figure 2 AA section view in the middle;

[0016] Figure 4 for Figure 3 Enlarged view of the structure inside the middle frame;

[0017] Figure 5 A perspective view of a first embodiment of the busbar and conductive components in a battery pack provided in this application.

[0018] Figure 6 This is a perspective view of a second embodiment of the busbar and conductive elements in a battery pack provided in this application.

[0019] Figure label:

[0020] 100-Single cell, 110-First wall, 120-Conductive component, 121-Welding part, 122-Allowing part, 130-Cell, 200-Busbar, 210-Connecting plate, 220-Arc-shaped part, 230-Second clearance notch.

[0021] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0022] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0023] As described in the background section, during the use of a battery pack, it needs to withstand complex external environments, such as external vibrations or impacts. This can affect the connection between individual cells, resulting in unstable output voltage of the battery pack and affecting its normal use.

[0024] Multiple individual cells with similar capacity and internal resistance can be connected in series or parallel to form a battery pack, enabling centralized output of electrical energy. Specifically, a busbar is fixedly connected to the conductive components of the individual cells by welding, forming a series or parallel circuit structure, thus creating a battery pack. However, in practical applications, because battery packs are subjected to external vibrations or impacts during operation, the connection points between the busbar and the conductive components are prone to deformation or damage due to mechanical stress.

[0025] For example, the end of the bus may collide with the edge of the conductive component under vibration, causing the bus to crack or bend, which in turn affects its conductivity.

[0026] To address the aforementioned technical problems, this application provides a battery pack comprising a busbar and at least two individual cells. Each individual cell has a first wall with conductive elements disposed thereon. The busbar connects the conductive elements of at least two individual cells to achieve series or parallel connection between the individual cells. Along the thickness direction of the first wall, at least a portion of the edge of the conductive element has a clearance gap d1mm between it and the busbar. By providing a clearance gap d1mm between the busbar and the edge of the conductive element, the probability of collision between the end of the busbar and the edge of the conductive element can be reduced when the battery pack is subjected to external impact vibration, thereby reducing the probability of busbar deformation and reducing welding failures between the busbar and the conductive element caused by busbar deformation.

[0027] In addition, the maximum thickness of the busbar is d2mm, the maximum thickness of the conductive component is d3mm, and d1 / (d2+d3) is 0.012-0.35. Within this range, the value of the clearance d1mm is adapted to the thickness of the busbar and the conductive component, which can further improve the anti-collision effect between the busbar and the conductive component and ensure the strength of the busbar and the conductive component.

[0028] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0029] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown in the figure, this application provides a battery pack including a busbar 200 and at least two individual cells 100.

[0030] The single cell 100 can store chemical energy and controllably convert chemical energy into electrical energy. In the recyclable single cell 100, the active materials can be activated by charging after discharge and continue to be used. The single cell typically includes a casing and a cell disposed inside the casing.

[0031] At least two individual cells 100 are connected in series or parallel to form a battery pack, and the individual cells 100 constituting the battery pack have similar capacity and internal resistance. Each individual cell 100 typically includes a casing and a cell 130 located within the casing. The casing has a first wall 110, on which a conductive element 120 is disposed. The conductive element 120 is used for conductive connection with the tabs of the cell 130. The conductive element 120 is used for electrical connection between the tabs located inside the casing and external devices (adjacent batteries or other electrical equipment) located outside the casing. The individual cell 100 can discharge to external devices through the cell output terminal (tab) and the conductive element 120. An external power source can charge the individual cell 100 through the conductive element 120 and the tabs. The conductive element 120 can be directly electrically connected to the tabs of the cell, or it can be electrically connected to the tabs through a metal adapter.

[0032] The materials used in conductive components include, but are not limited to, metals such as copper, aluminum, aluminum alloys, and copper-aluminum alloys.

[0033] For example, the conductive component 120 can be a pole assembly, which includes a pole and a riveting block. The riveting block is riveted to the pole, the pole passes through the first wall 110, and is electrically connected to the electrode ear through an adapter piece. After the riveting block is riveted to the pole, it can be electrically connected to the pole. The busbar 200 can be directly welded to the riveting block to achieve an electrical connection.

[0034] For example, the conductive element 120 is a terminal post, which is welded to the busbar 200 to achieve a conductive connection.

[0035] In this configuration, the conductive components 120 of at least two individual cells 100 are electrically connected to the busbar 200, and can be connected in parallel or in series through the busbar 200.

[0036] Specifically, the bus 200 electrically connects the conductive elements 120 of at least two individual cells 100 to enable the series or parallel connection of multiple individual cells 100.

[0037] Busbars can be made of metals such as copper, aluminum, tungsten, and manganese, or alloys such as copper-aluminum composite materials, which have good electrical conductivity.

[0038] In application, the battery pack is subjected to vibration during use, which causes the busbar 200 and the conductive element 120 to vibrate. The end of the busbar 200 is impacted by the conductive element 120, causing the busbar 200 to deform and be damaged. This affects the overcurrent effect between the busbar 200 and the conductive element 120, making the voltage output of the battery pack unstable and affecting the normal use of the battery pack.

[0039] In this regard, at least a portion of the edge of the conductive element 120 has a clearance gap with the busbar 200 along the thickness direction (Z direction) of the first wall 110, for example, a clearance gap is provided on the side adjacent to the end of the conductive element 120 and the busbar 200, which makes the edge of the conductive element 120 not in direct contact with the busbar 200.

[0040] When the battery pack is subjected to external impact or vibration, the presence of clearance can reduce the probability of collision between the end of the busbar 200 and the edge of the conductive element 120, thereby reducing the probability of deformation of the busbar 200 and reducing the occurrence of welding failure between the busbar 200 and the conductive element 120 due to deformation of the busbar 200.

[0041] In addition, along the Z direction, the clearance between the conductive element 120 and the busbar 200 is d1mm, the maximum thickness of the busbar 200 is d2mm, the maximum thickness of the conductive element 120 is d3mm, and d1 / (d2+d3) is 0.012-0.35, such as 0.013, 0.019, 0.15, 0.22, 0.3, etc.

[0042] If d1 / (d2+d3) is less than 0.012, it indicates that the proportion of d1 is extremely small. When the battery pack is subjected to external impact or vibration, and the end of the busbar 200 shakes, the shaking amplitude of the busbar 200 is greater than d1mm. The edge area of ​​the conductive component 120 will still collide with the busbar 200, causing the busbar 200 to deform or be damaged.

[0043] If d1 / (d2+d3) is greater than 0.35, it indicates that the clearance d1mm accounts for a very large proportion, which may lead to a significant decrease in the strength of busbar 200 and / or conductive component 120, affecting assembly stability.

[0044] When d1 / (d2+d3) is 0.012-0.35, the clearance d1mm is appropriately selected. This can prevent the end of the busbar 200 from colliding with the conductive component 120, avoid the busbar 200 from being deformed and damaged, thus affecting the current flow effect, and ensure the strength of the busbar 200 and the conductive component 120, so as not to affect their normal assembly.

[0045] For example, d1mm is 0.08mm-2mm, such as 0.09mm, 0.12mm, 0.18mm, 0.9mm, 0.15mm, 0.18mm, etc., preferably 0.1mm-1mm; d2mm is 0.8mm-8mm, such as 0.9mm, 0.12mm, 0.22mm, 0.35mm, 0.42mm, 0.55mm, 0.7mm, etc., preferably 1mm-5mm; d3mm is 1mm-8mm, such as 1.1mm, 1.8mm, 2.5mm, 4.5mm, 6mm, 8mm, etc., preferably 2mm-5mm.

[0046] Within this range, it can be used for most common battery pack sizes.

[0047] Furthermore, in some embodiments of this application, the conductive element 120 includes a welding portion 121 and a clearance portion 122. The welding portion 121 is used to weld to the busbar 200, and the clearance portion 122 is disposed in at least a portion of the periphery of the welding portion 121.

[0048] The thickness of the clearance portion 122 is less than the thickness of the weld portion 121, so as to form a first clearance notch between the clearance portion 122 and the weld portion 121, and a clearance gap is formed between the first clearance notch and the busbar 200.

[0049] By providing a clearance portion 122 only in at least a portion of the outer side of the welded portion 121 to form a first clearance notch, the impact on the strength of the conductive component 120 can be reduced, allowing the conductive component 120 to maintain good assembly strength. At the same time, the clearance portion 122 can also prevent the end of the busbar 200 from colliding with the conductive component 120, reducing the probability of deformation of the busbar 200, thereby effectively improving the stability of the battery pack.

[0050] For example, the clearance portion 122 is disposed around the periphery of the welding portion 121, such that after the welding portion 121 is welded to the busbar 200, the entire periphery of the welding portion 121 has a first clearance notch, and the busbar 200 and the clearance portion 122 are prevented from colliding through the first clearance notch.

[0051] For example, the avoidance part 122 is provided on the side of the welding part 121 facing the end of the busbar 200. The main problem is that the end of the busbar 200 is prone to collision with the conductive element 120 when it vibrates. The avoidance part 122 is provided in the area near the end of the busbar 200 to prevent the end of the busbar 200 from colliding with the conductive element 120.

[0052] Furthermore, the depth of the first clearance gap is d4mm, and d4 / (d2+d3) is 0.01-0.33, such as 0.02, 0.1, 0.18, 0.22, 0.3, etc.

[0053] The depth of the first clearance notch can also be understood as the difference between the upper surface of the clearance part 122 and the upper surface of the welding part 121 along the Z direction.

[0054] For example, d4mm is 0.08mm-0.9mm, such as 0.1mm, 0.2mm, 0.25mm, 0.4mm, 0.55mm, 0.8mm, etc., preferably 0.1mm-0.5mm. Within this range, it can meet the usage requirements of most common battery packs.

[0055] When d4 / (d2+d3) is less than 0.01, the value of d4mm is small. Although it can ensure the strength of the conductive component 120, it cannot effectively prevent the end of the busbar 200 from colliding with the avoidance part 122.

[0056] When d4 / (d2+d3) is greater than 0.33, the value of d4mm is too large. Although it can prevent the end of the busbar 200 from colliding with the avoidance part 122, it will cause the strength of the conductive part 120 to decrease significantly, affecting the assembly between the conductive part 120 and the pole or the first wall 110.

[0057] When d4 / (d2+d3) is 0.01-0.33, the value of d4mm can be kept within a suitable range, which can not only ensure the assembly strength of the conductive component 120, but also effectively avoid the collision between the end of the busbar 200 and the avoidance part 122, reducing the probability of deformation of the busbar 200.

[0058] Furthermore, in some embodiments of this application, the area of ​​the welding region between the welded part 121 and the busbar 200, projected onto the surface of the first wall 110, is S1mm. 2 The orthographic projection of the welded part 121 onto the surface of the first wall 110 is S2mm. 2 The ratio of S1 to S2 is 0.3-0.9.

[0059] Specifically, the busbar 200 is not welded to the entire welding part 121. Instead, it is usually connected to the middle area of ​​the welding part 121 by forming a ring of solder marks. Therefore, the area of ​​the welding area of ​​the welding part 121 and the busbar 200 projected onto the surface of the first wall 110 (the projected area of ​​the solder mark area) is smaller than the area of ​​the welding part 121 projected onto the surface of the first wall 110.

[0060] If S1 / S2 is less than 0.3, it indicates that the area occupied by the welding area is too small. This results in a small connection area between the busbar 200 and the welding part 121, and poor current flow capacity between the two. This not only affects the performance of the battery pack, but also easily leads to risks such as thermal runaway.

[0061] If S1 / S2 is greater than 0.9, it indicates that the area occupied by the welding area is too large. Although the connection area between the welding part 121 and the busbar 200 will increase, the welding area is too large, which will also cause the area of ​​the busbar 200 that needs to be heated for welding to become larger. The excessively large heated area will increase the risk of deformation of the busbar 200, which will affect the use effect of the busbar 200.

[0062] When S1 / S2 is 0.3-0.9, the area occupied by the welding area in the welding part 121 is appropriate, which can not only ensure the flow effect between the welding part 121 and the busbar 200, but also avoid the problem of the busbar 200 deforming due to excessive heating area.

[0063] Furthermore, in some embodiments of this application, the extension direction of the busbar 200 is parallel to the width direction of the first wall 110. Along the width direction (X direction) of the first wall 110, the minimum distance between the edge of the welding area of ​​the welding part 121 and the side of the welding part 121 facing the avoidance part 122 is cmm, where cmm is 0.5mm-3mm, for example, 1mm, 1.5mm, 2mm, 2.5mm, etc.

[0064] Specifically, if the distance cmm between the edge of the welding area of ​​the welding part 121 and the edge of the busbar 200 and the edge of the welding part 121 is too large, the movable area of ​​the busbar 200 is prone to collision with the edge of the welding part 121, which may cause the busbar 200 to deform easily and may cause the welding between the busbar 200 and the welding part 121 to fail.

[0065] If the diameter (cm) is too small, the edge of the welding area between the welding part 121 and the busbar 200 will be extremely close to the edge of the welding part 121. When heated, this will easily affect the avoidance part 122, and it will also easily cause the busbar 200 to deform due to the excessive heating area.

[0066] When the diameter (cmm) is 0.5mm-3mm, the heating area of ​​the busbar 200 can be made suitable, and the busbar 200 will not collide with the edge of the welded part 121.

[0067] Furthermore, the welding area between the welding part 121 and the busbar 200 is located in the middle of the welding part 121.

[0068] The welding area between the welding part 121 and the busbar 200 is located in the middle of the welding part 121, which can maximize the area of ​​the welding area between the busbar 200 and the welding part 121 and avoid collision between the welding part 121 and the busbar 200 during use.

[0069] The avoidance section 122 can be configured in at least the following ways:

[0070] For example, the conductive element 120 is square, the welding part 121 is also square, the extension direction of the bus 200 is the same as the width direction of the first wall 110, and the welding part 121 adjacent to the end of the bus 200 has a clearance part 122 provided on the side facing the end of the bus 200.

[0071] For example, when two individual cells 100 are connected to the busbar 200, the side of the welded portion 121 of the two individual cells 100 that is away from each other will be adjacent to the end of the busbar 200. The clearance portion 122 is only provided on the side of the two individual cells 100 that is away from each other.

[0072] In applications, the area where the busbar 200 is prone to deformation is mainly its end. By adding a buffer portion 122 to the corresponding area at the end, the probability of the busbar 200 colliding with the conductive component 120 can be effectively reduced, while also ensuring the current carrying effect of the conductive component 120.

[0073] For example, along the width direction of the first wall 110, both ends of the welded portion 121 are provided with clearance portions 122.

[0074] Specifically, each of the welding parts 121 extending along the Y direction is provided with a relief part 122, which can be used to deal with possible deformation of the busbar 200.

[0075] For example, busbar 200 may include an arc-shaped portion 220 and two connecting plates 210. The two connecting plates 210 are respectively disposed on both sides of the arc-shaped portion 220. The two connecting plates 210 are respectively connected to the conductive parts 120 of the two individual batteries 100. During use, if the battery pack is subjected to a large impact, the arc-shaped portion 220 may deform, reducing the pulling on the welding area between the connecting plate 210 and the welding portion 121, and reducing the risk of welding failure.

[0076] At this time, the avoidance part 122 is located on the side of the welding part 121 close to the arc-shaped part 220 and on the side away from the arc-shaped part 220. This can prevent the avoidance part 122 from colliding with the side of the connecting plate 210 away from the arc-shaped part 220, and can also prevent the avoidance part 122 from colliding with the arc-shaped part 220 and the side of the connecting plate 210 connected to the arc-shaped part 220.

[0077] In addition, this method can reduce the difficulty of processing and make assembly easier.

[0078] For example, the welded portion 121 is surrounded by a clearance portion 122.

[0079] For example, the conductive material is a square plate, forming a stepped structure that is proportionally reduced from the clearance part 122 to the welding part 121.

[0080] This results in the outer side of the welded part 121 being provided with a first clearance notch, which can prevent the busbar 200 from colliding with the conductive part 120 in the X and Y directions, and also makes the current flow between the busbar 200 and the conductive part more uniform.

[0081] Furthermore, in some embodiments of this application, the busbar 200 extends to the outside of the conductive member 120 along the length direction (Y direction) of the first wall 110, and the minimum distance between the edge of the busbar 200 and the welded portion 121 is a1 mm, and the minimum distance between the edge of the busbar 200 and the clearance portion 122 is a2 mm. a1 / a2 is 0.4-0.9, for example, 0.42, 0.55, 0.6, 0.72, 0.89, etc.

[0082] Specifically, the clearance portion 122 is provided at least on the side of the conductive member 120 extending in the X direction.

[0083] The larger a1 / a2 is, the shorter the length of the welded part 121 in the Y direction. This makes the area of ​​the welded part 121 available for welding with the busbar 200 in this direction smaller, which will affect the flow effect between the busbar 200 and the welded part 121.

[0084] The smaller a1 / a2 is, the longer the length of the welded part 121 in the Y direction and the shorter the length of the avoidance part 122 in the Y direction. This makes the length of the first avoidance notch in this direction smaller, which makes the edge of the busbar 200 more likely to collide with the conductive element 120, making the busbar 200 more likely to deform.

[0085] When a1 / a2 is 0.4-0.9, the welding area between the busbar 200 and the welding part 121 can be appropriately sized, ensuring the flow effect between them. At the same time, it can also prevent the busbar 200 and the avoidance part 122 from colliding on the corresponding side, reducing the probability of deformation of the busbar 200.

[0086] Furthermore, along the width direction (X direction) of the first wall 110, the edge of the busbar 200 extends to the outside of the conductive element 120. The minimum distance between the edge of the busbar 200 and the welded part 121 is b1mm, and the minimum distance between the edge of the busbar 200 and the clearance part 122 is b2mm. The ratio of b1 to b2 is 0.3-0.9, for example, 0.35, 0.5, 0.6, 0.77, 0.88, etc.

[0087] Specifically, the clearance portion 122 is also provided on the side of the welding portion 121 extending in the Y direction, that is, the clearance portion 122 can surround the outside of the welding portion 121.

[0088] When b1 / b2 is too small, the welded part 121 is smaller and the clearance part 122 is larger. The welded area between the busbar 200 and the welded part 121 is correspondingly smaller, resulting in a larger movable area at the end of the busbar 200. This leads to a larger deformation of the busbar 200 during vibration, making it easier for it to collide with the clearance part 122 and causing the busbar 200 to deform easily.

[0089] When b1 / b2 is too large, the size of the welded part 121 is larger and the size of the clearance part 122 is smaller. That is, the distance between the welded part 121 and the edge of the conductive element 120 is smaller. The welding area of ​​the busbar 200 and the welded part 121 is closer to the edge of the busbar 200. The welding heat-receiving area of ​​the busbar 200 becomes larger, making the busbar 200 more prone to deformation due to excessive heat-receiving area.

[0090] When b1 / b2 is 0.3-0.9, the busbar 200 and the welding part 121 have a suitable welding area, which avoids the busbar 200 from deforming due to excessive heating area, and also avoids the busbar 200 from having an excessively large movable area, thus reducing the probability of the busbar 200 colliding with the avoidance part 122.

[0091] Furthermore, a1mm ranges from 4mm to 20mm, for example, 4.5mm, 8mm, 10mm, 13mm, 15.5mm, 19.8mm, etc.; a2mm ranges from 2mm to 16mm, for example, 2mm, 3.3mm, 8mm, 10.5mm, 13mm, 15.9mm, etc.; b1mm ranges from 4mm to 30mm, for example, 4.8mm, 8mm, 12mm, 18mm, 22mm, 23.5mm, 27mm, etc.; and b2mm ranges from 2mm to 26mm, for example, 3mm, 10mm, 12.8mm, 17mm, 21.1mm, 29mm, etc.

[0092] When a1mm is 4mm-20mm, a2mm is 2mm-16mm, b1mm is 4mm-30mm, and b2mm is 2mm-26mm, the minimum distance between the welding part 121 and the edge of the busbar 200 in the X and Y directions is appropriate, and the minimum distance between the clearance part 122 and the busbar 200 is appropriate. This can avoid the movable area of ​​the edge of the busbar 200 being too large, reducing the deformation capacity of the edge of the busbar 200, and also avoid the welding area occupying too large an area of ​​the busbar 200, thereby preventing the busbar 200 from deforming due to excessive heating area.

[0093] Furthermore, in some embodiments of this application, the edge of the busbar 200 extends to the outside of the welded portion 121, and the edge of the clearance portion 122 extends to the outside of the busbar 200.

[0094] This can prevent the movable area at the edge of the busbar 200 from being too large, thereby further reducing the probability of the busbar 200 colliding with the conductive element 120 when vibrating.

[0095] Furthermore, along the width direction of the first wall 110, the edge of the busbar 200 extends to the outside of the welded portion 121, and the minimum distance between the edge of the busbar 200 and the welded portion 121 is a3mm. The clearance portion 122 extends to the outside of the busbar 200, and the minimum distance between the edge of the clearance portion 122 and the busbar 200 is a4mm. a3 / a4 is 0.4-0.9, for example, 0.4, 0.61, 0.75, 0.8, etc.

[0096] Specifically, the clearance portion 122 is provided at least on the side of the weld portion 121 extending in the X direction. In the X direction, the edge of the busbar 200 is within the clearance portion 122, and the length of the conductive element 120 in the opposite X direction is greater than the length of the busbar 200 in the X direction.

[0097] When a3 / a4 is 0.4-0.9, the distance between the edge of the busbar 200 and the edge of the welded part 121, and the distance between the edge of the busbar 200 and the edge of the avoidance part 122 along the X direction are appropriate, so that the movable area of ​​the busbar 200 is appropriate, and there will be no large-scale vibration, reducing the probability of the busbar 200 colliding with the avoidance part 122.

[0098] Furthermore, along the length direction (Y direction) of the first wall 110, the edge of the busbar 200 extends to the outside of the welded portion 121, and the minimum distance between the edge of the busbar 200 and the welded portion 121 is b3mm. The clearance portion 122 extends to the outside of the busbar 200, and the minimum distance between the edge of the clearance portion 122 and the busbar 200 is b4mm. The ratio of b3 / b4 is 0.3-0.9, for example, 0.33, 0.47, 0.5, 0.66, 0.8, etc.

[0099] Specifically, the clearance portion 122 is also provided on the side of the welding portion 121 extending in the Y direction, that is, the clearance portion 122 can surround the outside of the welding portion 121.

[0100] If b3 / b4 is less than 0.3, the welding area of ​​busbar 200 that can be used to weld with welding part 121 is relatively small, which will affect the flow effect between the two. If the welding area is too large, it may cause severe edge deformation of busbar 200.

[0101] When b3 / b4 is 0.3-0.9, the minimum distance between the end of the busbar 200 and the edge of the welded part 121, and the distance between the end of the busbar 200 and the edge of the avoidance part 122 are appropriate along the Y direction. This makes the movable area of ​​the busbar 200 appropriate, prevents large-scale vibration, and reduces the probability of the busbar 200 colliding with the avoidance part 122.

[0102] Furthermore, a3mm is 3mm-10mm, such as 3.5mm, 5mm, 7.2mm, 8mm, 9.9mm, etc.; a4mm is 2mm-8mm, such as 3mm, 5mm, 6.1mm, 7mm, etc.; b3mm is 3mm-20mm, such as 4mm, 5mm, 8mm, 15mm, 17.8mm, etc.; and b4mm is 2mm-16mm, such as 3.1mm, 5mm, 9mm, 11mm, 13mm, 14.9mm, etc.

[0103] With a3mm ranging from 3mm to 10mm, a4mm from 2mm to 8mm, b3mm from 3mm to 20mm, and b4mm from 2mm to 16mm, the minimum distance between the welded portion 121 and the edge of the busbar 200 in both the X and Y directions is appropriate, and the minimum distance between the clearance portion 121 and the edge of the busbar 200 in both the X and Y directions is appropriate, thus avoiding the problem that the welding area between the busbar 200 and the welded portion 121 is too small, which would affect the flow effect between the two.

[0104] In addition, the clearance between the busbar 200 and the edge of the conductive element 120 can also be achieved by means of the structural design of the busbar 200.

[0105] For example, at least a portion of the busbar 200 facing the conductive element 120 is provided with a second clearance notch, and a clearance gap is formed between the second clearance notch and the conductive element 120.

[0106] Specifically, if a second clearance notch is provided only on the busbar 200, and no clearance part 122 is provided on the conductive member 120, then at least a portion of the second clearance notch is opposite to the edge of the conductive member 120, so that the clearance gap can correspond to the edge of the conductive member 120, preventing the busbar 200 from colliding with the edge of the conductive member 120.

[0107] When a second clearance notch is provided on the busbar 200 and a clearance part 122 is provided on the conductive component 120, the position of the second clearance notch can be adjusted as follows:

[0108] For example, the orthographic projection of the second clearance notch onto the surface of the first wall 110 at least partially coincides with the orthographic projection of the weld portion 121 onto the surface of the first wall 110.

[0109] Specifically, the second clearance notch is at least partially opposite to the welded portion 121, so that there is also a gap between the edge of the welded portion 121 and the busbar 200 along the Z direction, which can prevent the busbar 200 from colliding with the welded portion 121.

[0110] Furthermore, the minimum distance between the edge of the second clearance notch projected onto the surface of the first wall 110 and the edge of the welded part 121 projected onto the surface of the first wall 110 is c1mm, where c1mm is 2mm-20mm, for example, 2mm, 7mm, 9mm, 13.5mm, 18mm, etc.

[0111] If c1mm is too large, it will reduce the size of the welding area between the busbar 200 and the welding part 121, affecting the flow effect between the two.

[0112] If c1mm is too small, the area of ​​the welded part 121 covered by the second clearance notch will be small, making it difficult to effectively prevent the busbar 200 from colliding with the welded part 121.

[0113] When c1mm is 2mm-20mm, it can ensure the flow rate and prevent the busbar 200 from colliding with the welded part 121 during use.

[0114] For example, the orthographic projection of the first clearance notch onto the surface of the first wall 110 at least partially coincides with the orthographic projection of the area of ​​the busbar 200 where the second clearance notch is not provided onto the surface of the first wall 110.

[0115] Specifically, the clearance d1mm can be the sum of the depth of the first clearance gap and the depth of the second clearance gap in some areas, the depth of the first clearance gap in some areas, and the depth of the second clearance gap in some areas.

[0116] For example, the edges of the first and second clearance notches away from the weld 121 are aligned with the orthographic projections on the surface of the first wall 110. In this case, in the edge region of the busbar 200, d1 is the sum of the depths of the first and second clearance notches. In this region, the busbar 200 vibrates relatively severely, so a larger value for d1mm can effectively prevent the busbar 200 from colliding with the conductive component 120.

[0117] The projection of the second clearance notch onto the surface of the first wall 110 near the edge of the weld 121 falls within the range of the projection of the first clearance notch onto the surface of the first wall 110. Therefore, in the area near the weld 121, d1mm is the depth of the first clearance notch. Within this range, the vibration amplitude of the busbar 200 is relatively small, which can also prevent the busbar 200 from colliding with the conductive component 120. At the same time, the size of the second clearance notch provided on the busbar 200 is relatively small, which helps to ensure the strength of the busbar 200.

[0118] This method avoids the first and second clearance gaps from being too deep, thereby preventing the busbar 200 from colliding with the conductive element 120 while also reducing the impact on the strength of the busbar 200 and the conductive element 120.

[0119] Furthermore, the minimum distance between the edge of the first clearance notch projected onto the surface of the first wall 110 and the edge of the non-second clearance notch area of ​​the busbar 200 projected onto the surface of the first wall 110 is c2mm, where c2mm is 2mm-20mm, for example, 2.5mm, 5mm, 10mm, 11.9mm, 17mm, 20mm, etc.

[0120] If c2mm is too large, the area of ​​the welded part 121 will be too small and the area of ​​the clearance part 122 will be too large, which will not only affect the strength of the conductive part 120, but also affect the current flow effect between the conductive part 120 and the busbar 200.

[0121] If c2mm is too small, it will be difficult to effectively improve the strength of busbar 200.

[0122] With c2mm ranging from 2mm to 20mm, the strength of busbar 200 can be effectively improved without affecting the current carrying capacity of busbar 200 and conductive component 120. In addition, it will not cause the strength of conductive component 120 to be too low.

[0123] Furthermore, the depth of the second clearance gap is d5mm, and d5 / (d2+d3) is 0.01-0.3.

[0124] The d5mm can be 0.08mm-0.8mm, such as 0.1mm, 0.33mm, 0.5mm, 0.77mm, etc., which can meet the usage requirements of most conventional battery packs.

[0125] When d5 / (d2+d3) is 0.01-0.3, the depth of the second clearance notch is appropriate, which can effectively prevent the busbar 200 from colliding with the conductive component 120, and will not cause the strength of the busbar 200 to be too low, so as not to affect the normal assembly of the busbar 200.

[0126] Furthermore, d5 / d4 can be set to 0.4-2.5, for example, 0.42, 0.8, 1, 1.8, 2.5, etc.

[0127] When d5 / d4 is 0.4-2.5, the values ​​of d5mm and d4mm can be adjusted according to the actual situation to prevent d5mm or d4mm from being too large and to avoid affecting the assembly strength of busbar 200 or conductive component 120.

[0128] This application also provides a battery pack, including the battery pack described in the above embodiments.

[0129] The battery pack also includes a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. All of these components and the battery pack are placed inside the battery pack housing and sealed with a cover plate, forming a complete functional unit that can directly output electrical energy.

[0130] This application also provides an electrical device, including an electrical device and a battery pack or battery module as described in the above embodiments. The battery pack or battery module is used to supply power to the electrical device. One or more battery packs or battery modules can be used, and the specific configuration can be adjusted according to actual conditions.

[0131] For example, multiple battery packs can be connected in series, parallel, or in a hybrid configuration (hybrid configuration means that multiple battery packs are connected in both series and parallel) to form a battery device. The battery device can serve as the operating power source for electrical devices or as the driving power source for electrical devices, replacing or partially replacing fuel or natural gas to provide driving power for vehicles.

[0132] For example, the battery device is a cluster-level battery structure formed by multiple battery packs connected in series, wherein the number of battery packs in each cluster is strictly configured according to voltage and capacity requirements. Specifically, the battery unit of the battery device includes multiple battery packs, some of the battery packs are connected in series to form a cluster that meets a preset power supply voltage requirement, and at least one spare battery pack among the multiple battery packs is bypassed.

[0133] It is understood that electrical equipment includes, but is not limited to, energy storage devices, electric ships, aircraft, laptops, power tools, electric bicycles, electric motorcycles, electric cars, military equipment, and aerospace equipment.

[0134] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0135] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, include: At least two individual cells (100), each individual cell (100) having a first wall (110) on which a conductive element (120) is disposed; Busbar (200) electrically connects the conductive element (120) of at least two of the individual cells (100); Wherein, at least a portion of the edge of the conductive element (120) has a clearance gap with the busbar (200), the width of the clearance gap is d1mm along the thickness direction of the first wall (110), the maximum thickness of the busbar (200) is d2mm, the maximum thickness of the conductive element (120) is d3mm, and d1 / (d2+d3) is 0.012-0.

35.

2. The battery pack according to claim 1, characterized in that, The conductive element (120) includes a welding portion (121) and a clearance portion (122). The welding portion (121) is used to weld to the busbar (200). The clearance portion (122) is disposed in at least a portion of the periphery of the welding portion (121), and the thickness of the clearance portion (122) is less than the thickness of the welding portion (121) to form a first clearance notch between the clearance portion (122) and the welding portion (121). The first clearance notch forms the clearance gap with the busbar (200).

3. The battery pack according to claim 2, characterized in that, The depth of the first clearance gap is d4mm, and d4 / (d2+d3) is 0.01-0.

33.

4. The battery pack according to claim 2, characterized in that, The area of ​​the welding region between the welded part (121) and the busbar (200) is S1mm as an orthographic projection onto the surface of the first wall (110). 2 The orthographic projection of the welded part (121) onto the surface of the first wall (110) is S2mm. 2 The ratio of S1 to S2 is 0.3-0.

9.

5. The battery pack according to claim 2, characterized in that, The extension direction of the busbar (200) is parallel to the width direction of the first wall (110). Along the width direction of the first wall (110), the welded part (121) faces the side of the avoidance part (122). The minimum distance between the edge of the welded part (121) and the welded area of ​​the busbar (200) is cmm, where cmm is 0.5mm-3mm.

6. The battery pack according to claim 5, characterized in that, The welding area between the welded part (121) and the busbar (200) is located in the middle of the welded part (121).

7. The battery pack according to claim 2, characterized in that, The extension direction of the busbar (200) is the same as the width direction of the first wall (110). The welded part (121) adjacent to the end of the busbar (200) has the clearance part (122) provided on the side facing the end of the busbar (200).

8. The battery pack according to claim 2, characterized in that, Along the width direction of the first wall (110), both ends of the welded part (121) are provided with the avoidance part (122).

9. The battery pack according to claim 8, characterized in that, The avoidance portion (122) is provided around the periphery of the welded portion (121).

10. The battery pack according to claim 2, characterized in that, Along the length direction of the first wall (110), the busbar (200) extends to the outside of the conductive element (120), and the minimum distance between the edge of the busbar (200) and the welded part (121) is a1 mm, and the minimum distance between the edge of the busbar (200) and the clearance part (122) is a2 mm, and a1 / a2 is 0.4-0.

9.

11. The battery pack according to claim 10, characterized in that, Along the width direction of the first wall (110), the edge of the busbar (200) extends to the outside of the conductive element (120), the minimum distance between the edge of the busbar (200) and the welded part (121) is b1mm, the minimum distance between the edge of the busbar (200) and the clearance part (122) is b2mm, and b1 / b2 is 0.3-0.

9.

12. The battery pack according to claim 11, characterized in that, a1mm is 4mm-20mm, a2mm is 2mm-16mm, b1mm is 4mm-30mm, and b2mm is 2mm-26mm.

13. The battery pack according to claim 2, characterized in that, The edge of the busbar (200) extends to the outside of the welded portion (121), and the edge of the clearance portion (122) extends to the outside of the busbar (200).

14. The battery pack according to claim 13, characterized in that, Along the width direction of the first wall (110), the minimum distance between the edge of the busbar (200) and the welded part (121) is a3mm, and the minimum distance between the edge of the clearance part (122) and the busbar (200) is a4mm, with a3 / a4 being 0.4-0.

9.

15. The battery pack according to claim 14, characterized in that, Along the length of the first wall (110), the minimum distance between the edge of the busbar (200) and the welded part (121) is b3mm, and the minimum distance between the edge of the clearance part (122) and the busbar (200) is b4mm, with b3 / b4 being 0.3-0.

9.

16. The battery pack according to claim 15, characterized in that, a3mm is 3mm-10mm, a4mm is 2mm-8mm, b3mm is 3mm-20mm, and b4 is 2mm-16mm.

17. The battery pack according to any one of claims 3-16, characterized in that, The busbar (200) has at least a second clearance notch (230) in a portion of the area facing the conductive element (120), and the clearance gap is formed between the second clearance notch (230) and the conductive element (120).

18. The battery pack according to claim 17, characterized in that, The depth of the second clearance gap (230) is d5mm, and d5 / (d2+d3) is 0.01-0.

3.

19. The battery pack according to claim 18, characterized in that, The ratio of d5 to d4 is 0.4-2.

5.

20. The battery pack according to claim 17, characterized in that, The orthographic projection of the second clearance notch (230) onto the surface of the first wall (110) is at least partially coincident with the orthographic projection of the weld (121) onto the surface of the first wall (110).

21. The battery pack according to claim 20, characterized in that, The minimum distance between the edge of the second clearance notch (230) projected onto the surface of the first wall (110) and the edge of the weld (121) projected onto the surface of the first wall (110) is c1mm, where c1mm is 2mm-20mm.

22. The battery pack according to claim 17, characterized in that, The orthographic projection of the first clearance gap onto the surface of the first wall (110) is at least partially coincided with the orthographic projection of the area of ​​the busbar (200) other than the second clearance gap (230) onto the surface of the first wall (110).

23. The battery pack according to claim 22, characterized in that, The minimum distance c2mm between the edge of the first clearance notch projected onto the surface of the first wall (110) and the edge of the non-second clearance notch (230) region of the busbar (200) projected onto the surface of the first wall (110) is 2mm-20mm.

24. A battery pack, characterized in that, Includes the battery pack as described in any one of claims 1-23.

25. An electrical appliance, characterized in that, It includes an electrical device, and a battery pack as described in any one of claims 1-23 or a battery pack as described in claim 24, the battery pack or the battery pack being used to supply power to the electrical device.

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