Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle, the battery pack comprises a box body, a plurality of battery cell groups and a pre-tightening mechanism, the plurality of battery cell groups are mounted in the box body, each battery cell group comprises a plurality of battery cells arranged along a first direction, the plurality of battery cell groups are sequentially arranged at intervals along the first direction and / or a second direction, and the pre-tightening mechanism is mounted in the box body. The first direction is perpendicular to the second direction; the pre-tightening mechanism is arranged between the adjacent battery cell groups, the pre-tightening mechanism comprises two supporting pieces and a driving assembly, the driving assembly is located between the two supporting pieces, the driving assembly is connected with the supporting pieces, the driving assembly drives the supporting pieces to be close to the battery cell group on the side where the supporting pieces are located, and the driving assembly drives the supporting pieces to be close to the battery cell group on the side where the driving assembly is located. And the battery cell group is abutted against the side where the battery cell group is located. The battery pack provided by the utility model overcomes the problem of poor battery performance caused by poor inhibition effect due to the fact that an existing battery pack only depends on a box body to inhibit battery cell expansion, reduces the occurrence of lithium precipitation phenomenon of the battery, prolongs the cycle life of the battery cell, and ensures reliable battery performance.

Description

Technical Field

[0001] The present application belongs to the technical field of lithium batteries, and in particular, relates to a battery pack and a vehicle. Background Art

[0002] The popularity of electric vehicles has promoted the rapid development of battery technologies such as lithium batteries. In the development of lithium battery technology, the emergence of cell to pack (CTP) technology has brought major innovations to the development of electric vehicles. CTP technology eliminates the module link in the typical integrated battery grouping and directly integrates the battery cells into the module body and places them in the battery pack, which greatly reduces the number of structural parts in the battery pack, thereby increasing the space available for placing the battery cells.

[0003] In the related art, the battery cells are clamped by the clamps before being put into the box, and the clamps are released and the battery cells are pressed into the box body when being put into the box, and the expansion force is suppressed only by the box body pre-tightening the battery cells. When multiple groups of battery cells are arranged in the box, the battery cells only rely on the pre-tightening effect of the box body to suppress the expansion of the battery cells, and the suppression effect is not good. The battery cells are prone to lithium deposition during use, which affects the performance of the battery. Utility Model Content

[0004] The embodiments of the present application provide a battery pack and a vehicle to solve the problem that the existing battery pack only relies on a box to suppress the expansion of the battery cells, but the suppression effect is poor, resulting in poor battery performance.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising:

[0006] Box;

[0007] A plurality of battery cell groups are installed in the box, the battery cell groups include a plurality of battery cells arranged along a first direction, the plurality of battery cell groups are sequentially spaced along the first direction and / or the second direction, and the first direction is perpendicular to the second direction;

[0008] A pre-tensioning mechanism is arranged between adjacent battery cell groups, and the pre-tensioning mechanism includes two support members and a driving assembly. The driving assembly is located between the two support members, and the driving assembly is connected to the support members. The driving assembly drives the support members to approach the battery cell group on its side and abut against the battery cell group on its side.

[0009] Optionally, the driving assembly includes a connecting rod mechanism, both ends of which are connected to the corresponding supporting members, and when the connecting rod mechanism moves to a dead point position, the supporting member abuts against one side of the battery cell group on which the supporting member is located.

[0010] Optionally, the driving assembly further includes a fixing member, wherein the fixing member is connected to the box body, and when the connecting rod mechanism moves to a dead point position, the connecting rod mechanism is fixedly connected to the fixing member.

[0011] Optionally, the connecting rod mechanism includes:

[0012] A ball head connecting rod, wherein two ends of the ball head connecting rod are respectively provided with a first ball head accommodating cavity and a second ball head accommodating cavity;

[0013] A first connecting rod, comprising a first connecting end and a second connecting end, wherein the first connecting end is rotatably connected to the ball head connecting rod, the first connecting end is located in the first ball head accommodating cavity, and the second connecting end is connected to the supporting member on the side thereof;

[0014] A second connecting rod, having a third connecting end and a fourth connecting end, wherein the third connecting end is rotatably connected to the ball head connecting rod, the third connecting end is located in the first ball head accommodating cavity, and the fourth connecting end is connected to the support member on the side thereof;

[0015] The connecting rod mechanism moves to a dead point position, the axes of the first connecting rod and the second connecting rod are in the same straight line, and the ball head connecting rod is fixedly connected to the fixing member.

[0016] Optionally, the ball head connecting rod includes a horizontal section and a vertical section, the vertical section is vertically connected to the horizontal section, the first ball head accommodating cavity and the second ball head accommodating cavity are correspondingly provided at two ends of the horizontal section, and the vertical section is connected to the fixing piece through a locking piece.

[0017] Optionally, the driving assembly further comprises a mounting plate, wherein the mounting plate is arranged on the bottom plate of the box body, and the fixing member is mounted on a side of the mounting plate facing away from the bottom plate.

[0018] Optionally, a plurality of the link mechanisms and a plurality of the fixing members are spaced apart along the length direction of the mounting plate.

[0019] Optionally, the box includes:

[0020] A body, wherein the body is provided with a groove, the battery cell group is installed in the groove, and two oppositely arranged side plates of the body are provided with sliding fittings, and the sliding fittings are located at the notch of the groove;

[0021] A cover plate is covered on the main body, sliding parts are arranged on both sides of the cover plate, the sliding parts are located on the side of the cover plate facing the main body, the sliding parts are slidably connected with the sliding matching parts, and the cover plate is sealed and connected with the main body.

[0022] Optionally, the sliding member includes a first slide groove and a second slide groove, and the first slide groove is vertically arranged to the second slide groove; the sliding matching member includes a first slide rail and a second slide rail, and the plane where the first slide rail is located is vertically arranged to the plane where the second slide rail is located, the first slide rail is located in the first slide groove, and the second slide rail is located in the second slide groove.

[0023] Optionally, the battery cell group further includes:

[0024] A positioning plate, disposed on the battery cell, the positioning plate extending along a first direction, and a plurality of mounting areas being provided on the positioning plate, the mounting areas corresponding to output ends of the battery cell;

[0025] A busbar is connected to the output end of the battery cell, the busbar is located in the installation area, and the busbar is connected to the positioning plate through a pin shaft.

[0026] Optionally, an elastic opening is provided at one end of the pin shaft connected to the positioning plate.

[0027] In a second aspect, an embodiment of the present application further provides a vehicle, comprising a battery pack as described in any one of the above.

[0028] The battery pack and vehicle provided in the embodiments of the present application, the battery pack includes a case, multiple battery cell groups and a pre-tightening mechanism, the multiple battery cell groups are installed in the case, each battery cell group includes multiple battery cells arranged along a first direction, the multiple battery cell groups are arranged in sequence along the first direction and / or the second direction, the first direction is perpendicular to the second direction, because there are gaps between adjacent battery packs, when the battery cells expand, they will inevitably bulge to the gap side, at this time, by setting the pre-tightening mechanism, the driving assembly of the pre-tightening mechanism drives the support member to approach the battery cell group on its side and abut against the battery cell group on its side, the pre-tightening mechanism provides a force opposite to the expansion force, the case and the pre-tightening mechanism work together to suppress the expansion of the battery cells, thereby overcoming the problem that the existing battery pack only relies on the case to suppress the expansion of the battery cells, the suppression effect is not good, and the battery performance is poor, the occurrence of battery lithium plating is reduced, the cycle life of the battery cells is improved, and the battery performance is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0030] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0031] Figure 1 A three-dimensional schematic diagram of a battery pack provided in an embodiment of the present application.

[0032] Figure 2 An exploded view of the battery pack provided in an embodiment of the present application.

[0033] Figure 3 A partial schematic diagram of the internal structure of the battery pack provided in an embodiment of the present application.

[0034] Figure 4 A schematic diagram of a pre-tightening mechanism in a battery pack in an embodiment of the present application in a contracted state.

[0035] Figure 5 A schematic diagram of a pre-tightening mechanism in a battery pack in a supporting state provided in an embodiment of the present application.

[0036] Figure 6 for Figure 2 A partial enlarged view of point A in the middle.

[0037] Figure 7 for Figure 2 A partial enlarged view of point B in the middle.

[0038] Figure 8 for Figure 2 A partial enlarged view of point C in the middle. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0040] The embodiment of the present application provides a battery pack to solve the problem that the existing battery pack only relies on the pre-tightening effect of the box body to suppress the expansion of the battery cell, but the suppression effect is poor, resulting in poor battery performance. The following will be described in conjunction with the accompanying drawings.

[0041] See also Figure 1 , Figure 2 and Figure 3 As shown, a battery pack 10 includes a box body 100 , a plurality of battery cell groups 200 and a pre-tightening mechanism 300 .

[0042] In this application example, see Figure 2As shown, the box 100 has a cubic structure. The box 100 includes a main body 110 and a cover plate 120. The main body 110 is provided with a groove 111 with an opening on one side. The battery cell group 200 is installed in the groove 111. The cover plate 120 covers the main body 110, and the cover plate 120 is sealed and connected to the main body 110. The cover plate 120 and the main body 110 form a sealed receiving space, and the battery cell group 200 is installed in the box 100. An insulating plate 150 is also provided between the cover plate 120 and the battery cell group 200. In this example, the box 100 can be made of aluminum material, such as, prepared by an aluminum extrusion molding process. The box 100 can be formed in one piece, or it can be processed into multiple plates first and then welded.

[0043] In this embodiment, see Figure 2 and Figure 3 As shown, a plurality of battery cell groups 200 are provided, and each battery cell group 200 includes a plurality of battery cells 210 arranged along a first direction. The number of battery cells 210 in each battery cell group 200 is the same, and the size of each battery cell group 200 is ensured to be the same as much as possible. A plurality of battery cell groups 200 are arranged at intervals along the first direction, or a plurality of battery cell groups 200 are arranged at intervals along the second direction, or a part of the battery cell groups 200 are arranged at intervals along the first direction, and another part of the battery cell groups 200 are arranged at intervals along the second direction, and are arranged in a matrix. The first direction is the X-axis direction, and the second direction is the Y-axis direction. The battery cell group 200 has a first side, a second side, a third side, and a fourth side, wherein the first side and the third side are arranged oppositely along the first direction, and the second side and the fourth side are arranged oppositely along the second direction. No matter how the plurality of battery cell groups 200 are arranged, there must be a battery cell group 200 that is in contact with the side wall of the box body 100.

[0044] In this embodiment, see Figure 3 , Figure 4 and Figure 5As shown, the pre-tightening mechanism 300 is arranged between adjacent battery cell groups 200. Exemplarily, if the battery cell groups 200 are arranged at intervals along the first direction, the pre-tightening mechanism 300 is arranged between the first side and the third side of the adjacent battery cell groups 200; if the battery cell groups 200 are arranged at intervals along the second direction, the pre-tightening mechanism 300 is arranged between the second side and the fourth side of the adjacent battery cell groups 200; if the battery cell groups 200 are arranged in an array along the first direction and the second direction, the pre-tightening mechanism 300 is arranged between the first side and the third side of the adjacent battery cell groups 200, and the pre-tightening mechanism 300 is arranged between the second side and the fourth side of the adjacent battery cell groups 200. The pre-tightening mechanism 300 includes two support members 310 and a drive assembly 320. The support member 310 is a support plate, which can be a rectangular plate. Taking multiple battery cell groups 200 arranged at intervals along the second direction as an example, the support members 310 extend along the direction, one support member 310 is in contact with the second side of the adjacent battery cell group 200, and the other support member 310 is in contact with the fourth side of the adjacent battery cell group 200. The driving component 320 is located between the two support members 310, and the driving component 320 is connected to the support member 310. The driving component 320 drives the support member 310 to approach the battery cell group 200 on its side and abut against the battery cell group 200 on its side.

[0045] It can be understood that for the battery cell group 200 that is attached to the box 100, the driving component 320 and the box 100 work together to suppress the expansion of the battery cell group 200, and the other battery cell groups 200 rely on the driving components 320 on both sides to expand. This overcomes the problem that the existing battery pack only relies on the box to suppress the expansion of the battery cell, the suppression effect is not good, and the battery performance is poor, the occurrence of battery lithium deposition is reduced, the cycle life of the battery cell is improved, and the battery performance is reliable.

[0046] In some embodiments, see Figure 4 and Figure 5 As shown, the driving assembly 320 includes a connecting rod mechanism 321. Both ends of the connecting rod mechanism 321 are connected to the corresponding support member 310. When the connecting rod mechanism 321 moves to the dead point position, the support member 310 abuts against one side of the battery cell group 200 on the side where the supporting member 310 is located.

[0047] In this embodiment, the driving assembly 320 uses a connecting rod mechanism 321 to drive the support member 310, so as to facilitate the adjustment of the distance between the two support members 310. When the pre-tightening mechanism 300 is installed in the gap between adjacent battery cell groups 200, the connecting rod mechanism 321 can be retracted, and the two support members 310 are relatively close to each other, so as to facilitate the installation of the driving assembly 320. After the pre-tightening mechanism 300 is installed between adjacent battery cell groups 200, the connecting rod mechanism 321 is moved to the dead point position, wherein the connecting rod mechanism 321 is in a straight line at the dead point position. At this time, the two support members 310 are relatively far away, and the support member 310 abuts against the battery cell group 200 on its side. The connecting rod mechanism 321 is in the dead point position and cannot move any further, so it can provide a stable supporting force to the support member 310, and ensure the inhibitory effect of the support member 310 on the battery cell group 200.

[0048] Based on the above implementation, see Figure 4 and Figure 5 As shown, the driving assembly 320 also includes a fixing member 322, which is connected to the box body 100, and the fixing member 322 is located next to the connecting rod mechanism 321. When the connecting rod mechanism 321 moves to the dead point position, the connecting rod mechanism 321 is fixedly connected to the fixing member 322. Exemplarily, the connecting rod mechanism 321 can be connected to the fixing member 322 through a pin. The connecting rod mechanism 321 is fixed at the dead point position by the fixing member 322 to prevent the connecting rod mechanism 321 from moving and resetting, and the support member 310 from being separated from the battery cell group 200 on its side, so as to provide a stable supporting force to the support member 310 and ensure the inhibitory effect of the support member 310 on the battery cell group 200.

[0049] Based on the above implementation, see Figure 4 and Figure 5 As shown, the connecting rod mechanism 321 includes a ball head connecting rod 323 , a first connecting rod 324 and a second connecting rod 325 .

[0050] In this embodiment, the two ends of the ball head connecting rod 323 are respectively provided with a first ball head accommodating cavity and a second ball head accommodating cavity. The first connecting rod 324 has a first connecting end and a second connecting end, the first connecting end is rotatably connected to the ball head connecting rod 323, and the first connecting end is located in the first ball head accommodating cavity. The second connecting end is connected to the support member 310 on its side, and the second connecting end is rotatably connected to the support member 310 on its side. The second connecting rod 325 has a third connecting end and a fourth connecting end, the third connecting end is rotatably connected to the ball head connecting rod 323, and the third connecting end is located in the first ball head accommodating cavity. The fourth connecting end is connected to the support member 310 on its side, and the fourth connecting end is rotatably connected to the support member 310 on its side. The connecting rod mechanism 321 moves to the dead point position, the axes of the first connecting rod 324 and the second connecting rod 325 are in the same straight line, and the ball head connecting rod 323 is fixedly connected to the fixing member 322.

[0051] The first connecting rod 324 and the second connecting rod 325 each include a first rod and a second rod, the first rod is connected to the second rod, and the first rod is connected to the ball connecting rod 323. The axis of the first rod is at a certain angle to the axis of the ball connecting rod 323, and the axis of the first rod is at a certain angle to the axis of the second rod. The second rod is connected to the support member 310 on its side. The connecting rod mechanism 321 moves to the dead point position, and the axes of the ball connecting rod 323, the first rod and the second rod are located on the same straight line.

[0052] Understandably, see Figure 4 As shown, in the initial state of the connecting rod mechanism 321, the axes of the first rod of the first connecting rod 324 and the first rod of the second connecting rod 325 are in an inverted "V" shape. The axes of the second rod of the first connecting rod 324 and the second rod of the second connecting rod 325 are arranged horizontally. Figure 5 As shown, the ball head connecting rod 323 is moved downward, driving the first connecting rod 324 and the second connecting rod 325 to move until the first connecting rod 324 and the second connecting rod 325, the first rod, the second rod and the ball head connecting rod 323 are located on the same straight line, and the ball head connecting rod 323 is fixedly connected to the fixing member 322.

[0053] Based on the above implementation, see Figure 4 and Figure 5 As shown, the ball head connecting rod 323 includes a horizontal section and a vertical section, and the vertical section is vertically fixedly connected to the horizontal section. The vertical section is located near the middle of the horizontal section, and the connecting rod mechanism 321 can be driven to move by the vertical section, which is convenient for operation, and the first connecting rod 324 and the second connecting rod 325 on both sides are evenly stressed. The first ball head accommodating cavity and the second ball head accommodating cavity are correspondingly provided at both ends of the horizontal section, and the first connecting rod 324 and the second connecting rod 325 are both connected to the horizontal section. At the dead point position, the axes of the first connecting rod 324, the second connecting rod 325 and the horizontal section are in the same direction, and the vertical section is connected to the fixing member 322 by a locking member 326. The locking member 326 can be a pin shaft, and the fixing member 322 has a pin hole. The vertical section is provided with a corresponding hole position, and the vertical section and the fixing member 322 can be fixed by a pin shaft, which has a simple structure and is easy to operate.

[0054] It can be understood that when the connecting rod mechanism 321 moves, the vertical section is first pushed downward, and when the connecting rod mechanism 321 moves to the dead point position, the connecting rod mechanism 321 is rotated until the vertical section moves above the fixing member 322, and the vertical section and the fixing member 322 are fixedly connected by the locking member 326. The connecting rod mechanism 321 has a simple structure and is easy to operate.

[0055] Based on the above implementation, see Figure 3 , Figure 4 and Figure 5As shown, the driving assembly 320 also includes a mounting plate 327. The mounting plate 327 is a long flat plate. The mounting plate 327 is arranged on the bottom plate of the box body 100, and the fixing member 322 is installed on the side of the mounting plate 327 away from the bottom plate. The fixing member 322 is fixedly connected to the box body 100 through the mounting plate 327, which facilitates the overall installation and disassembly of the preload mechanism 300.

[0056] In addition, a heightening beam can be provided on the bottom plate of the box body 100, and the heightening beam is located between adjacent battery cell groups 200. The mounting plate 327 is fixed on the heightening beam. The abutment position of the support member 310 and the battery cell group 200 is adjusted through the heightening beam to ensure the inhibitory effect of the support member 310 on the battery cell expansion.

[0057] Based on the above implementation, see Figure 4 and Figure 5 As shown, multiple link mechanisms 321 and multiple fixing members 322 are arranged at intervals along the length direction of the mounting plate 327. The link mechanisms 321 correspond to the fixing members 322 one by one. For example, the battery cell group 200 is arranged at intervals along the second direction, and the mounting plate 327 extends along the first direction. Along the first direction, the link mechanisms 321 are arranged at intervals, and the intervals between adjacent link mechanisms 321 are the same. Multiple link mechanisms 321 are arranged to provide support forces to different positions of the support member 310 along the length direction of the support member 310, respectively, to ensure that the support effect of each part of the support member 310 is basically the same, so that the support member 310 has basically the same effect of suppressing the expansion of the battery cells at different positions.

[0058] In some embodiments, see Figure 2 , Figure 6 and Figure 7 As shown, sliding members 130 are provided on both sides of the cover plate 120, and the sliding members 130 are located on the side of the cover plate 120 facing the body 110. Sliding fitting members 140 are provided on two oppositely arranged side plates 112 of the body 110, and the sliding fitting members 140 are located at the notch of the groove 111, and the sliding members 130 are slidably connected with the sliding fitting members 140. The cover plate 120 and the body 110 are slidably connected through the sliding members 130 and the sliding fitting members 140, and the installation and disassembly operations are convenient, and there is no need to use fasteners such as screws, thereby reducing material costs.

[0059] In some embodiments, see Figure 7 As shown, the sliding member 130 includes a first slide groove 131 and a second slide groove 132, and the first slide groove 131 is vertically arranged with respect to the second slide groove 132. The sliding fitting member 140 includes a first slide rail 141 and a second slide rail 142, and the plane where the first slide rail 141 is located is vertically arranged with respect to the plane where the second slide rail 142 is located, and the first slide rail 141 is located in the first slide groove 131, and the second slide rail 142 is located in the second slide groove 132.

[0060] For example, see Figure 6 As shown, the sliding member 130 includes a first plate 133, a second plate 134, a third plate 135 and a fourth plate 136. The first plate 133 is connected to one side of the cover plate 120, and the first plate 133 is vertically arranged with the cover plate 120. The first plate 133 can be integrally formed with the cover plate 120. The second plate 134 and the third plate 135 are both vertically arranged with the first plate 133, and the second plate 134 and the third plate 135 are both fixedly connected with one side of the first plate 133. The third plate 135 is closer to the cover plate 120 than the second plate 134, and the first plate 133, the second plate 134 and the third plate 135 surround the first slide groove 131. The fourth plate 136 is arranged parallel to the first plate 133 , and is fixed to a side of the second plate 134 away from the third plate 135 . The first plate 133 , the second plate 134 and the fourth plate 136 form a second slide groove 132 .

[0061] In this embodiment, the cover plate 120 is connected to the body 110 via a double slide rail, and the first slide rail 141 and the second slide rail 142 are vertically arranged to form limits in the horizontal direction and the vertical direction respectively, with good locking effect and easy installation.

[0062] In some embodiments, see Figure 2 As shown, the body 110 includes two side panels 112 and a panel 114. The two side panels 112 are arranged at intervals relative to each other, and a plurality of heat dissipation channels 113 are arranged in the side panels 112. Along the height direction of the box body 100, a plurality of heat dissipation fins are arranged at intervals inside the side panels 112, and the heat generated by the battery cell 210 is dissipated through the heat dissipation fins provided by the box body 100. The panel 114 is located at one end of the side panel 112, and the panel 114 is connected to the side panel 112. A vent 115 is provided on the panel 114, and the vent 115 is connected to the heat dissipation channel 113. The heat dissipation channel 113 is connected to the outside through the vent 115, forming a circulating air cooling, reducing the temperature in the box body 100, preventing thermal runaway, and improving the safety of the battery cell 210.

[0063] In some embodiments, see Figure 1 and Figure 2 As shown, a handle is provided at one end of the side panel 112 close to the panel 114 , and the handle extends out of the panel 114 to facilitate users to transfer the battery pack.

[0064] In some embodiments, see Figure 1 and Figure 2 As shown, the side panel 112 is provided with a recessed handle position to facilitate users to transfer the battery pack.

[0065] In some embodiments, see Figure 2 and Figure 3As shown, the box body 100 further includes an end plate 116 , which is disposed in the body 110 , and is fixedly connected to the body 110 , and the end plate 116 abuts against the battery cell group 200 on the side where the end plate 116 is located. Exemplarily, if two battery cell groups 200 are arranged in the box 100, and the two battery cell groups 200 are arranged at intervals along the second direction, the front and rear plates of the box 100 can apply a preload force along the first direction to the battery cell group 200, but there is an assembly error in the battery cell group 200, and there may be a gap between the battery cell group 200 and the front and rear plates. In this embodiment, an end plate 116 can be arranged at the end side of the battery cell group 200, such as one end of the battery cell group 200 abuts against the rear plate of the box 100, and the other end abuts against the end plate 116, or one end of the battery cell group 200 abuts against the front plate of the box 100, and the other end abuts against the end plate 116, or two end plates 116 are arranged in the box 100, and both ends of the battery cell group 200 abut against the end plate 116. By setting the end plate 116, battery cell thicknesses with different tolerances can be used to maintain the preload force on the battery cell. The material of the end plate 116 and the material of the box body 100 are both made of aluminum plates, and the end plate 116 and the box body 100 are assembled by laser welding for easy processing.

[0066] In some embodiments, see Figure 2 and Figure 8 As shown, the battery cell group 200 also includes a positioning plate 220 and a busbar 230. The positioning plate 220 is arranged on the battery cell 210, and the positioning plate 220 extends along the first direction. A plurality of mounting areas 221 are provided on the positioning plate 220, and the mounting areas 221 correspond to the output ends of the battery cells 210, and the output ends of the battery cells 210 are located in the mounting areas 221. The busbar 230 is connected to the output ends of the battery cells 210, and the busbar 230 includes a plurality of connectors, which are arranged in the mounting areas 221, and the connectors are connected to the positioning plate 220 through pins 240. In this embodiment, the installation position of the busbar 230 is pre-positioned by the positioning plate 220, and the busbar 230 is pre-fixed, so as to facilitate the installation of the busbar 230 and improve the processing efficiency.

[0067] Based on the above implementation, see Figure 8 As shown, an elastic opening 241 is provided at one end of the pin shaft 240 connected to the positioning plate 220. It can be understood that a pin hole is provided on the positioning plate 220 on one side of the installation area 221, one end of the pin shaft 240 is fixedly connected to the bus 230, and the other end is placed in the pin hole. An "I"-shaped or "X"-shaped elastic opening 241 is provided at the end of the pin shaft 240 for easy installation. In addition, when the pin shaft 240 moves up and down, the elastic opening 241 is deformed to prevent the pin shaft 240 from driving the positioning plate 220 to move up and down.

[0068] An embodiment of the present application also provides a vehicle, comprising the battery pack described in any one of the above embodiments.

[0069] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0070] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0071] The battery pack and vehicle provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: include: Box (100); A plurality of battery cell groups (200) are installed in the box (100), the battery cell groups (200) comprising a plurality of battery cells (210) arranged along a first direction, the plurality of battery cell groups (200) being arranged in sequence and spaced apart along the first direction and / or the second direction, the first direction being perpendicular to the second direction; A pre-tightening mechanism (300) is arranged between adjacent battery cell groups (200), the pre-tightening mechanism (300) comprising two support members (310) and a driving assembly (320), the driving assembly (320) being located between the two support members (310), the driving assembly (320) being connected to the support members (310), and the driving assembly (320) driving the support members (310) to approach the battery cell group (200) on the side thereof and to abut against the battery cell group (200) on the side thereof.

2. The battery pack (10) according to claim 1, characterized in that: The driving assembly (320) comprises a connecting rod mechanism (321), both ends of the connecting rod mechanism (321) are connected to the corresponding supporting member (310), and when the connecting rod mechanism (321) moves to a dead point position, the supporting member (310) abuts against one side of the battery cell group (200) on the side where the supporting member (310) is located.

3. The battery pack (10) according to claim 2, characterized in that: The driving assembly (320) further comprises a fixing member (322), wherein the fixing member (322) is connected to the box body (100), and when the connecting rod mechanism (321) moves to a dead point position, the connecting rod mechanism (321) is fixedly connected to the fixing member (322).

4. The battery pack according to claim 3, characterized in that: The connecting rod mechanism (321) comprises: A ball head connecting rod (323), wherein two ends of the ball head connecting rod (323) are respectively provided with a first ball head accommodating cavity and a second ball head accommodating cavity; A first connecting rod (324) having a first connecting end and a second connecting end, wherein the first connecting end is rotatably connected to the ball head connecting rod (323), the first connecting end is located in the first ball head accommodating cavity, and the second connecting end is connected to the support member (310) on the side where the first connecting end is located; A second connecting rod (325) having a third connecting end and a fourth connecting end, wherein the third connecting end is rotatably connected to the ball head connecting rod (323), the third connecting end is located in the first ball head accommodating cavity, and the fourth connecting end is connected to the support member (310) on the side where the third connecting end is located; The connecting rod mechanism (321) moves to a dead point position, the axes of the first connecting rod (324) and the second connecting rod (325) are in the same straight line, and the ball head connecting rod (323) is fixedly connected to the fixing member (322).

5. The battery pack according to claim 4, characterized in that: The ball head connecting rod (323) comprises a horizontal section and a vertical section, the vertical section is vertically connected to the horizontal section, the first ball head accommodating cavity and the second ball head accommodating cavity are correspondingly provided at two ends of the horizontal section, and the vertical section is connected to the fixing member (322) via a locking member (326).

6. The battery pack according to claim 3, characterized in that: The driving assembly (320) further comprises a mounting plate (327), wherein the mounting plate (327) is arranged on the bottom plate of the box body (100), and the fixing member (322) is mounted on a side of the mounting plate (327) facing away from the bottom plate.

7. The battery pack according to claim 6, characterized in that: Along the length direction of the mounting plate (327), a plurality of the link mechanisms (321) and a plurality of the fixing members (322) are arranged at intervals.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The box (100) comprises: A body (110), the body (110) being provided with a groove (111), the battery cell group (200) being installed in the groove (111), two oppositely arranged side plates (112) of the body (110) being provided with sliding fittings (140), the sliding fittings (140) being located at the notch of the groove (111); A cover plate (120), the cover plate (120) covers the main body (110), sliding members (130) are provided on both sides of the cover plate (120), the sliding member (130) is located on the side of the cover plate (120) facing the main body (110), the sliding member (130) is slidably connected to the sliding matching member (140), and the cover plate (120) is sealedly connected to the main body (110).

9. The battery pack according to claim 8, characterized in that: The sliding member (130) includes a first slide groove (131) and a second slide groove (132), and the first slide groove (131) is vertically arranged with respect to the second slide groove (132); the sliding matching member (140) includes a first slide rail (141) and a second slide rail (142), and the plane where the first slide rail (141) is located is vertically arranged with respect to the plane where the second slide rail (142) is located, and the first slide rail (141) is located in the first slide groove (131), and the second slide rail (142) is located in the second slide groove (132).

10. The battery pack according to any one of claims 1 to 7, characterized in that: The battery cell group (200) further includes: A positioning plate (220) is arranged on the battery cell (210), the positioning plate (220) extends along a first direction, a plurality of mounting areas (221) are arranged on the positioning plate (220), and the mounting areas (221) correspond to output ends of the battery cell (210); A busbar (230) is connected to the output end of the battery cell (210); the busbar (230) is located in the installation area (221); and the busbar (230) is connected to the positioning plate (220) via a pin shaft (240).

11. The battery pack according to claim 10, characterized in that: An elastic opening (241) is provided at one end of the pin shaft (240) connected to the positioning plate (220).

12. A vehicle, characterized in that: include: A battery pack as claimed in any one of claims 1 to 11.

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