Battery pack

Abstract

The utility model discloses a battery pack, which comprises a box body, a battery pack, a battery pack cover and a battery pack cover, the battery module is arranged in the accommodating cavity; the first pressing plate extends in the first direction in the horizontal plane and comprises a first plate part and a second plate part, the second plate part is arranged on the upper side of the battery module so as to press the battery module, the first plate part is connected with the second plate part and extends in the vertical direction, and the first plate part is arranged on the peripheral side of the battery module and is connected with the box body. According to the battery pack disclosed by the utility model, the first pressing plate is arranged in the battery pack, the first pressing plate is provided with the first plate part arranged on the peripheral side of the battery module, and the first plate part is connected with the box body, so that the battery module in the battery pack is well protected, and the first pressing plate can be matched with the box body to improve the lateral structural strength of the battery pack; and the battery pack can better bear lateral collision, so that the risk of thermal runaway during lateral collision of the battery pack is well reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] With the rapid development of new energy vehicles and fierce competition in the industry, cost control has also been greatly enhanced. Under this environment, the design of the battery pack box has also become an object of cost reduction. Existing battery packs reduce the height of the side beams and longitudinal beams to reduce material costs, and arrange the explosion-proof valves of the battery cells in the battery pack on the upper side or the upper side of the battery cells to reduce the thermal control risk caused by the collision of the low side beams or longitudinal beams with the explosion-proof valves. However, due to the reduction in the height of the battery pack side beams and longitudinal beams, the lateral structural strength of the battery pack is reduced. When the battery pack side column collision occurs, the battery modules in the battery pack are easily impacted and thermal runaway occurs, making the thermal runaway risk of the battery pack still high. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery pack, which can improve the lateral structural strength and effectively reduce the thermal runaway risk of the battery pack.

[0004] According to the utility model, the battery pack includes: a box body, the box body is formed with a accommodating cavity; a battery module, the battery module is arranged in the accommodating cavity; a first pressure plate, the first pressure plate extends along a first direction in a horizontal plane and includes a first plate portion and a second plate portion, the second plate portion is arranged on the upper side of the battery module to press the battery module, the first plate portion is connected to the second plate portion and extends vertically, and the first plate portion is arranged on the peripheral side of the battery module and connected to the box body.

[0005] According to the battery pack of the utility model, by arranging a first pressure plate in the battery pack, the first pressure plate is provided with a first plate portion arranged on the peripheral side of the battery module and the first plate portion is connected to the box body, so that the battery modules in the battery pack are well protected, and the first pressure plate can cooperate with the box body to improve the lateral structural strength of the battery pack, so that the battery pack can better withstand lateral impact, thereby greatly reducing the risk of thermal runaway of the battery pack during a lateral collision.

[0006] In some embodiments of the present invention, the battery pack further includes a connector, wherein the connector is fixedly connected to the box body, and the connector is connected to the first plate portion.

[0007] In one embodiment of the utility model, there are multiple connecting members, and the multiple connecting members are arranged at intervals along the first direction, wherein two of the multiple connecting members located at the two ends of the first direction are first connecting members, and a limiting groove is formed on the first connecting member, and the first plate portion is respectively fixed to the limiting groove at the two ends of the first direction.

[0008] In some embodiments of the utility model, the battery modules are provided in plurality, and the plurality of battery modules are arranged at intervals along a second direction, and the second direction intersects with the first direction. The battery pack also includes a second pressure plate, which extends along the first direction and includes: a third plate portion, two third plate portions are provided, and the two third plate portions are respectively arranged on the upper sides of two adjacent battery modules to press the battery modules; a U-plate portion, and the cross-section of the U-plate portion is a U-shape with the opening facing upward, and the U-plate portion is arranged between two adjacent battery modules, and the two side edges of the opening of the U-plate portion are respectively connected to the two third plate portions, and the lower end of the U-plate portion is connected to the box body.

[0009] In one embodiment of the utility model, the U-plate portion includes a first plate segment, a second plate segment and a connecting plate segment, the second plate segment is vertically arranged with the first plate segment and spaced apart in the second direction, the two third plate segments are respectively connected with the first plate segment and the second plate segment, the connecting plate segment is horizontally arranged and connected with the first plate segment and the second plate segment, and the connecting plate segment is connected with the box body.

[0010] In one embodiment of the utility model, the battery module includes a plurality of battery cells stacked along the first direction, the battery cells are provided with an explosion-proof valve on at least one side of the second direction, and the first pressure plate and / or the second pressure plate are provided with an exhaust hole, and the exhaust hole is connected to the explosion-proof valve.

[0011] In some examples of the present invention, the exhaust hole is formed on the U-plate portion, and the second pressure plate further includes: a guide baffle, which is connected to the U-plate portion and is located on the side of the U-plate portion away from the battery module in the second direction, one end of the guide baffle is connected to one side edge of the exhaust hole in the vertical direction, and the other end of the guide baffle is away from the exhaust hole and extends obliquely along the vertical direction toward the other side edge of the exhaust hole.

[0012] In one example of the utility model, the U-plate portion includes a first plate segment and a second plate segment extending vertically and arranged in parallel and at intervals in a second direction, the exhaust holes are formed on both the first plate segment and the second plate segment, and the guide baffle provided on the first plate segment extends upwardly at an angle from the one end toward the other end, and the guide baffle provided on the second plate segment extends downwardly at an angle from the one end toward the other end.

[0013] In one embodiment of the utility model, the box body includes a first box body, which includes: a bottom plate and a side beam, the bottom plate is horizontally arranged, the side beam extends in a ring shape along the circumference of the bottom plate, and cooperates with the bottom plate to enclose a first cavity with an open top; a longitudinal beam, the longitudinal beam extends along the first direction and is fixedly connected to the bottom plate, the two ends of the longitudinal beam in the first direction are connected to the side beam, and the longitudinal beam divides the first cavity into a plurality of sub-cavities; the battery module is arranged on both sides of the longitudinal beam in the first direction, and the U-plate portion also includes a connecting plate segment, The connecting plate section is connected to the longitudinal beam; the cross beam extends along the second direction, and a plurality of cross beams are provided, and the plurality of cross beams are respectively arranged at the two ends of the longitudinal beam in the first direction, wherein the battery module is fixed to the bottom plate and is located in the sub-cavity, the two ends of the second plate portion in the second direction are respectively fixed to the upper end of the cross beam, the lower end of the first plate portion is connected to the side beam and / or the bottom plate, the two ends of the third plate portion in the second direction are respectively fixed to the upper end of the cross beam, and the lower end of the U-plate portion is fixedly connected to the longitudinal beam.

[0014] In one embodiment of the utility model, the box body also includes a second box body, which defines a second cavity with an open lower side, and the second box body cover is arranged on the upper side of the first box body and cooperates with the first box body to define the accommodating cavity, wherein the first box body is a metal part and the second box body is a composite material part.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a battery pack according to an embodiment of the utility model;

[0017] Figure 2 is a schematic diagram of a battery pack according to an embodiment of the utility model without the second box;

[0018] Figure 3 is a partially enlarged schematic diagram of a battery pack according to an embodiment of the utility model after the second box is removed;

[0019] Figure 4 yes Figure 2 A schematic diagram of the battery pack shown in another angle;

[0020] Figure 5 yes Figure 2 A schematic diagram of the battery pack shown in another angle;

[0021] Figure 6 is a cross-sectional view of a first box body according to an embodiment of the utility model;

[0022] Figure 7 is a schematic cross-sectional view of a battery pack according to an embodiment of the utility model with the second box removed;

[0023] Figure 8 is a schematic diagram of a first box and a connecting member according to an embodiment of the utility model;

[0024] Fig. 9 is a schematic diagram of a first pressing plate and a positioning pin according to an embodiment of the utility model;

[0025] Fig.10 is a schematic diagram of a second pressing plate and a guide baffle according to an embodiment of the utility model;

[0026] Fig.11 yes Fig.10 Schematic diagram of another angle of the second pressure plate and the guide baffle shown in .

[0027] Reference numerals:

[0028] 10. Box body; 101. Exhaust hole

[0029] 11. first box body; 111. side beam; 112. bottom plate; 113. longitudinal beam; 114. cross beam;

[0030] 12. second box; 20. battery module; 201. explosion-proof valve;

[0031] 30. first pressing plate; 31. first plate portion; 311. first connecting hole; 32. second plate portion;

[0032] 40, second pressing plate; 41, third plate portion; 42, U plate portion; 421, first plate segment; 422, second plate segment; 423, connecting plate segment; 4231, second connecting hole;

[0033] 50, connecting member; 501, limiting groove; 502, first matching hole;

[0034] 60. guide baffle; 70. positioning pin;

[0035] 100. Battery pack. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] Reference below Figure 1-Figure 11 A battery pack 100 according to an embodiment of the present invention is described.

[0038] like Figure 1-Figure 11 As shown, the battery pack 100 according to the embodiment of the present invention includes: a box body 10 , a battery module 20 and a first pressing plate 30 .

[0039] Specifically, the box body 10 is formed with a receiving cavity; the battery module 20 is arranged in the receiving cavity; the first pressing plate 30 is arranged along a first direction in a horizontal plane (such as Figure 2 The battery module 20 extends in the front-to-back direction and includes a first plate portion 31 and a second plate portion 32. The second plate portion 32 is disposed on the upper side of the battery module 20 (as shown in FIG. Figure 5 The first plate portion 31 is connected to the second plate portion 32 and is arranged in the vertical direction (as shown in the vertical direction) to press the battery module 20. Figure 5 The first plate portion 31 extends in the up-down direction as shown, and is arranged on the peripheral side of the battery module 20 and connected to the box body 10.

[0040] In this embodiment, a first pressing plate 30 and a second pressing plate 40 are arranged in the battery pack 100. The second plate portion 32 of the first pressing plate 30 can play a good role in pressing the battery module 20, so that the battery module 20 can be stably fixed in the battery pack 100. The first plate portion 31 of the first pressing plate 30 extends vertically and is arranged on the peripheral side of the battery module 20, and the first plate portion 31 is connected to the box 10, so that the first plate portion 31 can cooperate with the box 10 on the peripheral side of the battery module 20 to play a good protective effect on the battery module 20. The first plate portion 31 cooperates with the box 10 to improve the structural strength of the battery pack 100. When the battery pack 100 hits the side column, the first plate portion 31 can well withstand the impact of the battery pack on the side, so that the battery module 20 is not easy to directly hit the external impact object when the side column hits, thereby reducing the probability of thermal runaway of the battery module 20, and further reducing the risk of thermal runaway of the battery pack 100.

[0041] In this embodiment, the first plate portion 31 is connected to the second plate portion 32, and the first plate portion 31 extends vertically. The second plate portion 32 is arranged on the upper side of the battery module 20. The second plate portion 32 can cooperate with the first plate portion 31 to protect the battery module 20, so that the first plate portion 31 can have a higher structural strength, so that the first pressure plate 30 can cooperate with the box body 10 to improve the lateral structural strength of the battery pack 100, thereby greatly reducing the risk of thermal runaway of the battery pack 100.

[0042] According to the battery pack 100 of the embodiment of the utility model, a first pressure plate 30 is arranged in the battery pack 100, and the first pressure plate 30 is provided with a first plate portion 31 arranged on the peripheral side of the battery module 20, and the first plate portion 31 is connected to the box body 10, so that the battery module 20 in the battery pack 100 is well protected, and the first pressure plate 30 can cooperate with the box body 10 to improve the lateral structural strength of the battery pack 100, so that the battery pack 100 can better withstand lateral impact, thereby greatly reducing the risk of thermal runaway of the battery pack 100 during lateral collision.

[0043] In some embodiments of the present invention, Figure 8 The battery pack 100 may further include a connector 50 , which is fixedly connected to the box body 10 and connected to the first plate portion 31 .

[0044] In this embodiment, a connecting member 50 is provided to connect the first plate portion 31 and the box body 10. The connecting member 50 has a simple structure and is convenient to connect, so that the first plate portion 31 and the box body 10 are conveniently and reliably connected and fixed. Optionally, the connecting member 50 and the box body 10 can be welded and fixed, and the connecting member 50 and the first plate portion 31 can also be welded and fixed or detachably connected.

[0045] Furthermore, the connecting member 50 is detachably connected to the first plate portion 31. This makes it easier and more convenient to assemble and disassemble the first pressing plate 30 and the box body 10.

[0046] In one embodiment of the present invention, Figure 8 As shown, there can be multiple connecting members 50, and the multiple connecting members 50 are arranged at intervals along the first direction, wherein two connecting members 50 located at the two ends of the multiple connecting members 50 in the first direction are first connecting members, and a limiting groove 501 is formed on the first connecting member, and the first plate portion 31 is respectively fixed with the limiting groove 501 at the two ends of the first direction.

[0047] In this embodiment, a limiting groove 501 is formed on the first connecting member, and the two ends of the first plate portion 31 are respectively fixed in the limiting groove 501. The limiting groove 501 has a simple structure, so that when the first plate portion 31 is assembled with the box body 10, the first plate portion 31 can be more conveniently positioned and assembled with the box body 10 through the limiting groove 501. For example, the connecting member 50 can be provided with two, three, four, etc., and the limiting grooves 501 are formed on the two connecting members 50 located at the two ends of the first direction among the multiple connecting members 50. The number, shape and arrangement position of the connecting members 50 can be designed and adjusted according to the size of the battery pack 100 and the connection and fixing requirements of the first plate portion 31. Furthermore, the limiting groove 501 opens upward, and the lower end of the first plate portion 31 can be inserted into the limiting groove 501 from top to bottom, so that the first plate portion 31 and the connecting member 50 can be assembled more conveniently.

[0048] In some examples of the present invention, Figure 3 , Figure 8 and Fig. 9 As shown, the connecting member 50 can be a connecting plate, which is provided with a first matching hole 502, and the first plate portion 31 is provided with a first connecting hole 311. The first plate portion 31 and the connecting member 50 are fastened and connected by fasteners passing through the first connecting hole 311 and the first matching hole 502.

[0049] In this embodiment, a first matching hole 502 is set on the connecting plate, and a first connecting hole 311 is set on the first plate portion 31, so that the connecting member 50 and the first plate portion 31 are connected and fixed by fasteners passing through the first matching hole 502 and the first connecting hole 311, which has a simple structure, convenient fixing, and easy assembly. In this embodiment, the connecting member 50 is set as a connecting plate, and the connecting plate is detachably connected and fixed to the first plate portion 31 and the box body 10, so that after the first pressing plate 30 is assembled and fixed to the box body 10, the connecting member 50 can play a certain structural reinforcement role on the first plate portion 31, so that the first plate portion 31 and the connecting member 50 have better structural strength as a whole, so that the first pressing plate 30 can cooperate with the connecting member 50 and the box body 10 to better protect the battery module 20 in the battery pack 100, so that the risk of thermal runaway of the battery pack 100 is smaller in the event of a side collision.

[0050] Furthermore, if Figure 8 and Fig. 9As shown, a plurality of first matching holes 502 can be provided, and the plurality of first matching holes 502 are arranged at intervals along the first direction. A plurality of first connection holes 311 are provided, and the plurality of first connection holes 311 are arranged one-to-one with the plurality of first matching holes 502. In this way, the connection and fixation between the first plate portion 31 and the connecting member 50 can be more firmly and reliably made, and the overall structure can be more compact and stable after the first pressing plate 30 and the box body 10 are assembled. To a certain extent, the structural strength of the battery pack 100 can be better, thereby reducing the risk of thermal runaway of the battery pack 100 when a side collision occurs. For example, two, three, four, five, six, seven, eight, etc. first matching holes 502 can be provided, and the number of the first connection holes 311 and the first matching holes 502 is the same and they are arranged one-to-one with the first matching holes 502.

[0051] Furthermore, refer to Figure 8 and Fig. 9 As shown, the first connecting hole 311 and the first matching hole 502 may both be through holes, or both be threaded holes, or one of the first connecting hole 311 and the first matching hole 502 may be a through hole and the other may be a threaded hole.

[0052] In this embodiment, the first connection hole 311 and the first matching hole 502 are both set as through holes, so that when the first plate portion 31 is assembled with the connecting member 50, the fastener can pass through the through holes for connection and fixation. In this embodiment, the first connection hole 311 and the first matching hole 502 are both set as threaded holes, or one of the first connection hole 311 and the first matching hole 502 is a through hole and the other is a threaded hole, and the threaded holes can be matched with fasteners for threaded fixation, so that the first plate portion 31 and the connecting member 50 are connected and fixed more conveniently.

[0053] For example, the fastener may be a bolt and a nut. The bolt may pass through the first matching hole 502 which is a through hole and the first connecting hole 311 and be screwed together with the nut, thereby fastening the connecting member 50 to the first plate portion 31. The fastener may also be provided with only a bolt. The bolt may pass through the first connecting hole which is a through hole and be screwed together with the first matching hole 502 which is a threaded hole, so as to fasten the first plate portion 31 to the connecting member 50 through the screw head.

[0054] Furthermore, if Figure 8 and Fig. 9 As shown, the connector 50 may be provided with a positioning hole, the first plate portion 31 may be provided with a second matching hole, the positioning hole matches with the second matching hole, and the battery pack 100 may further include a positioning pin 70, which is inserted and fixed in the positioning hole and the second matching hole. In this way, the first plate portion 31 and the connector 50 can be positioned and fixed more conveniently and accurately when assembled, thereby making the assembly of the battery pack 100 more convenient.

[0055] In some embodiments of the present invention, reference Figure 2As shown, the battery module 20 may be provided in plurality, and the plurality of battery modules 20 are arranged along the second direction (eg Figure 2 The left and right directions shown in the figure) are arranged at intervals, and the second direction intersects with the first direction. The battery pack 100 can also include a second pressing plate 40, which extends along the first direction and includes: a third plate portion 41 and a U-plate portion 42. The third plate portion 41 is provided with two, and the two third plate portions 41 are respectively arranged on the upper sides of two adjacent battery modules 20 to press the battery modules 20.

[0056] The cross section of the U-plate portion 42 is a U-shape with the opening facing upward. The U-plate portion 42 is arranged between two adjacent battery modules 20 . The two side edges of the opening of the U-plate portion 42 are respectively connected to the two third plate portions 41 , and the lower end of the U-plate portion 42 is connected to the box body 10 .

[0057] In this embodiment, a plurality of battery modules 20 are arranged in the battery pack 100, and the battery modules 20 are arranged at intervals in the second direction. The second pressing plate 40 is provided with a third plate portion 41, and the third plate portion 41 is respectively arranged on the upper side of the adjacent battery modules 20, so that the second pressing plate 40 can press the two adjacent battery modules 20, and the structure is simple and convenient to use. The second pressing plate 40 is provided with a U plate portion 42 between the two adjacent battery modules 20, and the U plate portion 42 can play a good role in separating the two adjacent battery modules 20, so that when the battery pack 100 is hit sideways on one side of the second direction, the battery module 20 on the side has a small impact on the battery module 20 on the other side after the thermal runaway occurs, thereby reducing the scope of the thermal runaway or delaying the aggravation of the thermal runaway to a certain extent, prolonging the time for the entire battery pack 100 to catch fire and explode, so that the vehicle using the battery pack 100 can have more time to escape during the side collision.

[0058] In this embodiment, the two side edges of the opening of the U plate portion 42 are respectively connected to the two third plate portions 41, with a simple structure and convenient connection. The lower end of the U plate portion 42 is connected to the box body 10, so that the second pressure plate 40 is conveniently connected and fixed.

[0059] Furthermore, the third plate portion 41 and the U plate portion 42 can be integrally formed, so that the second pressure plate 40 can be processed and manufactured more conveniently and efficiently, and the overall structure of the second pressure plate 40 is more compact and has better structural strength, so that the second pressure plate 40 can well resist the gas impact during thermal runaway and stably press the battery module 20.

[0060] In one embodiment of the present invention, Fig.10 and Fig.11As shown, the U-plate portion 42 may include a first plate segment 421, a second plate segment 422 and a connecting plate segment 423, the second plate segment 422 is vertically arranged with the first plate segment 421 and spaced apart in the second direction, the two third plate portions 41 are respectively connected to the first plate segment 421 and the second plate segment 422, the connecting plate segment 423 is horizontally arranged and connected to the first plate segment 421 and the second plate segment 422, and the connecting plate segment 423 is connected to the box body 10.

[0061] In this embodiment, the U-plate portion 42 is provided with a first plate segment 421, a second plate segment 422 and a connecting plate segment 423. The first plate segment 421 and the second plate segment 422 are arranged vertically and spaced apart in the second direction. The structure is simple and can well separate two adjacent battery modules 20. The connecting plate segment 423 is connected to the first plate segment 421 and the second plate segment 422 and to the box body 10. The structure is simple and convenient for the U-plate portion 42 to be connected and fixed to the box body 10.

[0062] Furthermore, the first plate segment 421, the second plate segment 422 and the connecting plate segment 423 can be integrally formed. This makes it easier to process the U-plate portion 42, makes the overall structure of the second pressing plate 40 more compact, and makes the overall structural strength of the second pressing plate 40 better, so that the second pressing plate 40 can more stably press the battery module 20 and connect and fix it to the box body 10.

[0063] In some examples of the present invention, reference Figure 2 and Figure 8 As shown, the second pressing plate 40 is detachably connected to the box body 10. This makes it easier to assemble and disassemble the second pressing plate 40 and the box body 10.

[0064] In one embodiment of the present invention, reference Figure 2 and Figure 3 As shown, the battery module 20 may include a plurality of battery cells stacked along a first direction, an explosion-proof valve 201 is provided on at least one side of the battery cells in a second direction, and an exhaust hole 101 is provided on the first pressure plate 30 and / or the second pressure plate 40, and the exhaust hole 101 is connected to the explosion-proof valve 201.

[0065] In this embodiment, the exhaust hole 101 is arranged on the first pressing plate 30 and / or the second pressing plate 40 to communicate with the explosion-proof valve 201 on the battery cell, so that when the battery cell in the battery module 20 has thermal runaway after a side collision, the high-temperature gas generated by the explosion of the explosion-proof valve 201 of the battery cell can be discharged to the outside from the exhaust hole 101, thereby effectively avoiding the crossflow of the gas in the battery module 20, thereby reducing the thermal impact of the high-temperature gas on other battery cells, delaying the degree of thermal runaway of the battery module 20, and thereby extending the thermal runaway time of the entire battery pack 100, so that the driver and passengers can have more time to escape after the vehicle has a side collision. For example, the exhaust hole 101 can be arranged on the first pressing plate 30, or the exhaust hole 101 can be arranged on the second pressing plate 40, or the exhaust hole 101 can be arranged on both the first pressing plate 30 and the second pressing plate 40. Optionally, a plurality of exhaust holes 101 may be provided, and the plurality of exhaust holes 101 may be connected to the explosion-proof valves 201 of the plurality of battery cells in the battery module 20 in a one-to-one correspondence, or the exhaust hole 101 may be connected to the plurality of explosion-proof valves 201 in a corresponding manner.

[0066] In some examples of the present invention, Figure 5 , Figure 7 and Fig.10 As shown, an exhaust hole 101 can be formed on the U-plate portion 42, and the second pressure plate 40 also includes: a guide baffle 60, which is connected to the U-plate portion 42 and is located on the side of the U-plate portion 42 away from the battery module 20 in the second direction, one end of the guide baffle 60 is connected to one side edge of the exhaust hole 101 in the vertical direction, and the other end of the guide baffle 60 is away from the exhaust hole 101 and extends obliquely along the vertical direction toward the other side edge of the exhaust hole 101.

[0067] It can be understood that the explosion-proof valves 201 of the battery cells stacked in the battery module 20 are usually located at the same height on the same side of the battery module 20. In two adjacent battery modules 20, the explosion-proof valves 201 in the two battery modules 20 are both arranged on the side facing the adjacent battery module 20. When thermal runaway occurs in the battery module 20, the high-temperature gas can flow along the exhaust hole 101 to the battery module 20 on the opposite side, thereby affecting the battery module 20 on the opposite side.

[0068] In the present embodiment, a guide baffle 60 is provided at the exhaust hole 101 of the U plate portion 42. The guide baffle 60 is arranged on the outer side of the exhaust hole 101 in the second direction and extends obliquely, so as to guide the gas flowing out of the exhaust hole 101. When thermal runaway occurs in the battery module 20, when the high-temperature gas flows out through the exhaust hole 101 from the side of the exhaust hole 101 facing the battery module 20, the high-temperature gas can flow upward or downward under the guiding effect of the guide baffle 60, thereby effectively preventing the high-temperature gas from flowing into the battery module 20 adjacent in the second direction, thereby effectively delaying the spread of the thermal runaway in the battery pack 100 and prolonging the thermal runaway time of the battery pack 100.

[0069] In one example of the present invention, Fig.10 and Fig.11 As shown, the U-plate portion 42 may include a first plate segment 421 and a second plate segment 422 extending vertically and arranged in parallel and at intervals in the second direction, exhaust holes 101 are formed on the first plate segment 421 and the second plate segment 422, and the guide baffle 60 provided on the first plate segment 421 extends upwardly at an angle from one end toward the other end, and the guide baffle 60 provided on the second plate segment 422 extends downwardly at an angle from one end toward the other end.

[0070] In this embodiment, the guide baffle 60 arranged on the first plate segment 421 extends upwardly and tilted, and the guide baffle 60 arranged on the second plate segment 422 extends downwardly and tilted, so that the two guide baffles 60 can cooperate with each other to better block the high-temperature gas discharged from the exhaust hole 101 on one side from flowing into the battery module 20 through the exhaust hole 101 on the other side, so that the guide baffle 60 can better play a guiding role, so that when the battery pack 100 has thermal runaway, the high-temperature gas can be better discharged from the exhaust hole 101 to the outside of the battery module 20.

[0071] In one embodiment of the present invention, Figure 8 As shown, the box body 10 may include a first box body 11 , and the first box body 11 includes: a bottom plate 112 , a side beam 111 , a longitudinal beam 113 and a cross beam 114 .

[0072] Specifically, the bottom plate 112 is arranged horizontally, the side beam 111 extends in a ring shape along the circumference of the bottom plate 112, and cooperates with the bottom plate 112 to enclose a first cavity with an open top; the longitudinal beam 113 extends along the first direction and is fixedly connected to the bottom plate 112, and the two ends of the longitudinal beam 113 in the first direction are connected to the side beam 111, and the longitudinal beam 113 divides the first cavity into a plurality of sub-cavities; the battery module 20 is arranged on both sides of the longitudinal beam 113 in the first direction, and the U-plate portion 42 also includes a connecting plate section 423, and the connecting plate section 423 is connected to the longitudinal beam 113.

[0073] The cross beam 114 extends along the second direction, and there are multiple cross beams 114, which are respectively arranged at the two ends of the longitudinal beam 113 in the first direction, wherein the battery module 20 is fixed on the bottom plate 112 and is located in the sub-cavity, the two ends of the second plate portion 32 in the second direction are respectively fixed to the upper end of the cross beam 114, the lower end of the first plate portion 31 is connected to the side beam 111 and / or the bottom plate 112, the two ends of the third plate portion 41 in the second direction are respectively fixed to the upper end of the cross beam 114, and the lower end of the U-plate portion 42 is fixedly connected to the longitudinal beam 113.

[0074] In this embodiment, a longitudinal beam 113 is provided to divide the first cavity into a plurality of sub-cavities, and the battery modules 20 are arranged in the sub-cavities respectively, so that the battery modules 20 can be arranged more conveniently when assembled in the box body 10. The U-plate portion 42 of the second pressure plate 40 is connected to the longitudinal beam 113 through the connecting plate section 423, and can cooperate with the longitudinal beam 113 to separate two adjacent battery modules 20, so that the battery module 20 can have a relatively independent operating environment, thereby making the battery module 20 more stable during operation.

[0075] In this embodiment, the first plate portion 31 of the first pressure plate 30 is connected to the side beam 111 and / or the bottom plate 112, and the second plate portion 32 of the first pressure plate 30 is fixed to the cross beam 114 at both ends of the first direction. The structure is simple, so that the first pressure plate 30 can be stably and reliably connected and fixed to the box body 10, so that the first pressure plate 30 can cooperate with the side beam 111 to provide good structural reinforcement for the lateral structure of the box body 10, so that the battery pack 100 can better withstand lateral collisions, thereby greatly reducing the risk of thermal runaway of the battery pack 100.

[0076] In this embodiment, the third plate portion 41 of the second pressure plate 40 is fixedly connected to the cross beam 114 at both ends in the second direction, and the U-plate portion 42 is fixedly connected to the longitudinal beam 113, so that the second pressure plate 40 can be stably and reliably connected and fixed to the box body 10, making the overall structure of the box body 10 more compact and stable, and the second pressure plate 40 stably presses the battery module 20.

[0077] In one embodiment of the present invention, reference Figure 8 and Fig.11 As shown, the connecting plate section 423 is provided with a plurality of second connecting holes 4231, the longitudinal beam 113 is provided with a third matching hole, and the connecting plate section 423 and the longitudinal beam 113 are connected and fixed by fasteners passing through the second connecting holes 4231 and the third matching holes. In this way, the second pressing plate 40 and the box body 10 can be assembled more conveniently and easily.

[0078] In one embodiment of the present invention, reference Figure 2 and Figure 3As shown, the first pressing plate 30 and the second pressing plate 40 can be detachably connected to the crossbeam 114. This makes it easier to assemble or disassemble the first pressing plate 30 and the second pressing plate 40 with the box body 10 when the battery pack 100 is assembled.

[0079] In one embodiment of the present invention, Figure 1 As shown, the box body 10 may further include a second box body 12, which defines a second cavity with an open lower side. The second box body 12 is covered on the upper side of the first box body 11 and cooperates with the first box body 11 to define a accommodating cavity, wherein the first box body 11 is a metal part and the second box body 12 is a composite material part.

[0080] In this embodiment, a second box 12 is provided to cooperate with the first box 11 to form a box 10 structure, and the second box 12 has a second cavity opened at the lower side. The second box 12 is a composite material part, which makes the overall weight of the box 10 lighter, thereby greatly improving the weight energy density of the battery pack 100. In this embodiment, the first box 11 is provided as a metal part, so that the box 10 has good structural strength, so that the battery module 20 can be stably and reliably fixed in the accommodating cavity of the box 10. For example, the first box 11 can be an aluminum part, a steel part, etc., and the second box 12 can be a sheet-like film plastic part, a phase change material part, a sheet-like film plastic and a phase change material mixed part, etc.

[0081] The following will refer to Figure 1-Figure 11 A battery pack 100 according to a specific embodiment of the present invention is described.

[0082] like Figure 1-Figure 11 As shown, the battery pack 100 according to the embodiment of the utility model can be used as a power supply device or a driving device of a vehicle, etc. The battery pack 100 includes a box body 10, a battery module 20, a first pressing plate 30, a second pressing plate 40, a connecting member 50, a guide baffle 60 and a positioning pin 70.

[0083] The box body 10 includes a first box body 11 and a second box body 12. The first box body 11 includes a side beam 111, a bottom plate 112, a cross beam 114 and a longitudinal beam 113. The side beam 111 extends in a ring shape along the circumferential direction of the bottom plate 112 and is fixedly connected to the bottom plate 112. The side beam 111 and the bottom plate 112 enclose and define a first cavity. The longitudinal beam 113 extends along the first direction and divides the first cavity into two sub-cavities. The battery module 20 is provided with two and arranged in the two sub-cavities respectively. The battery module 20 extends along the first direction. The battery module 20 is provided with a plurality of battery cells stacked and arranged along the first direction. The battery cells are provided with explosion-proof valves 201 on both sides in the second direction. The explosion-proof valves 201 are arranged close to the upper side of the battery cells. The side beam 111 and the longitudinal beam 113 are short side beams and short longitudinal beams. The heights of the side beam 111 and the longitudinal beam 113 are less than the height of the battery module 20 to reduce production costs.

[0084] The second box body 12 forms a second cavity that is open at the lower side. The second box body 12 is covered on the first box body 11 and cooperates with the first box body 11 to define a accommodating cavity. The battery module 20 is arranged in the accommodating cavity. The battery module 20 is a blade battery module 20. Buffer foam is provided between the abutting surfaces of the first box body 11 and the second box body 12 and is assembled by bolts.

[0085] There are six connecting members 50, three in a group. Two groups of connecting members 50 are respectively arranged on both sides of the bottom plate 112 in the second direction and are welded and fixed to the bottom plate 112 and the side beam 111. Each group of connecting members 50 is arranged at intervals along the first direction. In the first direction, the two connecting members 50 located at both ends form limiting grooves 501 and are provided with two first matching holes 502. The middle connecting member 50 is a connecting plate and is provided with four first matching holes 502 and one positioning hole. The connecting member 50 is arranged on the side of the side beam 111 facing the battery module 20.

[0086] The first pressing plate 30 is an L-shaped pressing plate. The first pressing plate 30 is a metal part with an insulating spray coating on the surface. The first pressing plate 30 can be but is not limited to an aluminum plate or a steel plate. The first pressing plate 30 includes a first plate portion 31 and a second plate portion 32. The first plate portion 31 is vertically arranged and extends along the first direction. The first plate portion 31 is arranged on the peripheral side of the battery module 20. The lower ends of the first plate portion 31 extend into the limiting grooves 501 at both ends of the first direction respectively. The lower end of the first plate portion 31 is provided with a first connecting hole 311 arranged one-to-one with the first matching hole 502 and a first connecting hole 312 arranged one-to-one with the first matching hole 502. The second matching hole is arranged corresponding to the hole, and the positioning pin 70 passes through the positioning hole and the second matching hole to position and fix the first plate portion 31 and the connecting member 50, and the first plate portion 31 and the connecting member 50 are fixedly connected by bolts or rivets; the second plate portion 32 is arranged on the upper end surface of the battery module 20 and is fixed to the beam 114 at both ends in the first direction by bolts or rivets, wherein the connecting portion between the first plate portion 31 and the connecting member 50 is filled with thermal conductive structural adhesive to buffer vibration, and the connecting portion between the first plate portion 31 and the beam 114 is filled with thermal conductive structural adhesive to buffer vibration.

[0087] The second pressing plate 40 is a metal part and has an insulating spray coating on its surface. The second pressing plate 40 can be but is not limited to an aluminum plate or a steel plate. The second pressing plate 40 includes a third plate portion 41 and a U plate portion 42. The U plate portion 42 includes a first plate segment 421, a second plate segment 422 and a connecting plate segment 423. The first plate segment 421 and the second plate segment 422 extend along the first direction and are arranged at intervals in the second direction. The connecting plate segment 423 extends along the first direction and is arranged horizontally. The connecting plate segment 423 is respectively connected to the lower edge of the first plate segment 421 and the lower edge of the second plate segment 422 at both ends in the second direction. A plurality of second connecting holes 4231 arranged at intervals along the first direction are provided on the connecting plate segment 423. The connecting plate segment 423 is fixedly connected to the longitudinal beam 113 by bolts or rivets.

[0088] There are two third plate portions 41 and both are arranged horizontally. The third plate portions 41 are arranged at intervals in the second direction and are respectively arranged on the upper end surfaces of two adjacent battery modules 20. The third plate portions 41 are respectively connected to the upper edges of the first plate segment 421 and the second plate segment 422. The third plate portions 41 are respectively connected and fixed to the cross beam 114 at both ends in the first direction by bolts or rivets, wherein the position where the connecting plate segment 423 is connected to the longitudinal beam 113 is filled with thermal conductive structural adhesive to buffer vibration, and the position where the third plate portion 41 is connected to the cross beam 114 is filled with thermal conductive structural adhesive to buffer vibration.

[0089] The first pressing plate 30 and the second pressing plate 40 are both integrally formed, and the first plate portion 31 of the first pressing plate 30 and the first plate segment 421 and the second plate segment 422 of the second pressing plate 40 are both provided with an exhaust hole 101, and the exhaust hole 101 extends along a first direction and is connected to the explosion-proof valve 201, and two guide baffles 60 are provided and are respectively arranged on a side of the first plate segment 421 facing the second plate segment 422 and a side of the second plate segment 422 facing the first plate segment 421. One end of the guide baffle 60 arranged in the first plate section 421 is connected to the lower edge of the exhaust hole 101 and the other end extends obliquely upward away from the exhaust hole 101 to be flush with the vertical upper edge of the exhaust hole 101. One end of the guide baffle 60 arranged in the second plate section 422 is connected to the upper edge of the exhaust hole 101 and the other end extends obliquely downward away from the exhaust hole 101 to be flush with the vertical lower edge of the exhaust hole 101. The angle between the guide baffle 60 and the horizontal plane can be between 30 degrees and 90 degrees, so that the gas can be discharged smoothly and have a good guide effect.

[0090] The battery pack 100 of this embodiment provides a first pressure plate 30 in the battery pack 100. The first pressure plate 30 is provided with a first plate portion 31 arranged on the peripheral side of the battery module 20 and the first plate portion 31 is connected to the case 10, so that the battery module 20 in the battery pack 100 is well protected. The first pressure plate 30 can cooperate with the case 10 to improve the lateral structural strength of the battery pack 100, so that the battery pack 100 can better withstand lateral impact, thereby greatly reducing the risk of thermal runaway of the battery pack 100 in a lateral collision. When the vehicle is hit sideways, the time from thermal runaway to fire and explosion of the battery pack 100 can be well extended, so that the driver and passengers can have sufficient warning and escape time.

[0091] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0092] In addition, 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0093] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0095] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A box body, wherein the box body is formed with a receiving cavity; A battery module, wherein the battery module is disposed in the accommodating cavity; A first pressing plate, the first pressing plate extends along a first direction in a horizontal plane and includes a first plate portion and a second plate portion, the second plate portion is arranged on the upper side of the battery module to press the battery module, the first plate portion is connected to the second plate portion and extends vertically, the first plate portion is arranged on the peripheral side of the battery module and connected to the box body.

2. The battery pack according to claim 1, characterized in that: The battery pack further includes a connector, which is fixedly connected to the box body and connected to the first plate portion.

3. The battery pack according to claim 2, characterized in that: There are multiple connecting members, and the multiple connecting members are arranged at intervals along the first direction, wherein two of the multiple connecting members located at the two ends in the first direction are first connecting members, and a limiting groove is formed on the first connecting member, and the first plate portion is respectively fixed to the limiting groove at the two ends in the first direction.

4. The battery pack according to any one of claims 1 to 3, characterized in that: The battery module is provided with a plurality of battery modules, and the plurality of battery modules are arranged at intervals along a second direction, the second direction intersects with the first direction, and the battery pack further includes a second pressing plate, the second pressing plate extends along the first direction and includes: A third plate portion, wherein two third plate portions are provided, and the two third plate portions are respectively arranged on the upper sides of two adjacent battery modules to press the battery modules; A U-plate portion, wherein the cross section of the U-plate portion is a U-shape with the opening facing upward, the U-plate portion is arranged between two adjacent battery modules, the two side edges of the opening of the U-plate portion are respectively connected to the two third plate portions, and the lower end of the U-plate portion is connected to the box body.

5. The battery pack according to claim 4, characterized in that: The U-plate portion includes a first plate segment, a second plate segment and a connecting plate segment, the second plate segment is vertically arranged with the first plate segment and spaced apart in the second direction, the two third plate segments are respectively connected with the first plate segment and the second plate segment, the connecting plate segment is horizontally arranged and connected with the first plate segment and the second plate segment, and the connecting plate segment is connected with the box body.

6. The battery pack according to claim 4, characterized in that: The battery module includes a plurality of battery cells stacked and arranged along the first direction. The battery cells are provided with explosion-proof valves on at least one side in the second direction. The first pressing plate and / or the second pressing plate are provided with exhaust holes, which are connected to the explosion-proof valves.

7. The battery pack according to claim 6, characterized in that: The exhaust hole is formed on the U plate portion, and the second pressing plate further includes: A guide baffle, the guide baffle is connected to the U-plate portion and is located on the side of the U-plate portion away from the battery module in the second direction, one end of the guide baffle is connected to one edge of the exhaust hole in the vertical direction, and the other end of the guide baffle is away from the exhaust hole and extends obliquely along the vertical direction toward the other edge of the exhaust hole.

8. The battery pack according to claim 7, characterized in that: The U-plate portion includes a first plate segment and a second plate segment extending vertically and arranged in parallel and at intervals in a second direction, the exhaust holes are formed on both the first plate segment and the second plate segment, and the guide baffle provided on the first plate segment extends upwardly at an angle from the one end toward the other end, and the guide baffle provided on the second plate segment extends downwardly at an angle from the one end toward the other end.

9. The battery pack according to claim 4, characterized in that: The box body comprises a first box body, and the first box body comprises: A bottom plate and side beams, wherein the bottom plate is arranged horizontally, and the side beams extend in a ring shape along the circumference of the bottom plate and cooperate with the bottom plate to enclose a first cavity with an open top; A longitudinal beam, the longitudinal beam extending along the first direction and fixedly connected to the bottom plate, the two ends of the longitudinal beam in the first direction are connected to the side beams, and the longitudinal beam divides the first cavity into a plurality of sub-cavities; the battery modules are arranged on both sides of the longitudinal beam in the first direction, and the U-plate portion further includes a connecting plate section, and the connecting plate section is connected to the longitudinal beam; A cross beam extending along the second direction, a plurality of cross beams are provided, and the plurality of cross beams are respectively arranged at two ends of the longitudinal beam in the first direction, In which, the battery module is fixed on the bottom plate and located in the sub-cavity, the two ends of the second plate portion in the second direction are respectively fixed to the upper ends of the cross beam, the lower end of the first plate portion is connected to the side beam and / or the bottom plate, the two ends of the third plate portion in the second direction are respectively fixed to the upper ends of the cross beam, and the lower end of the U-plate portion is fixedly connected to the longitudinal beam.

10. The battery pack according to claim 9, characterized in that: The box body also includes a second box body, which defines a second cavity with an open lower side, and the second box body cover is arranged on the upper side of the first box body and cooperates with the first box body to define the accommodating cavity, wherein the first box body is a metal part and the second box body is a composite material part.

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