Lithium ion battery pack

Abstract

The utility model relates to the field of lithium ion batteries, and discloses a lithium ion battery pack. Comprising a plurality of lithium ion battery modules, each module comprises a vertical frame, two single batteries and a heat-conducting sheet metal part, in the vertical frame, the vertical frame is divided into a front frame and a rear frame by a spacing surface, the two single batteries are arranged in the front frame and the rear frame, and tabs of the two single batteries extend out of a top frame to form two rows of tabs which are opposite front and back; each heat-conducting sheet metal part comprises a middle area and two bent edges, the front end surfaces and the rear end surfaces of the plurality of lithium ion battery modules are oppositely arranged in sequence to form a column of battery pack body, and two opposite outer side surfaces of the battery pack body are the bent edges of the heat-conducting sheet metal parts; and the temperature and voltage acquisition module is internally provided with a circuit and a temperature sensor electrically connected with the circuit, is electrically connected with the control module, is electrically connected with the control module, is tightly attached to the outer side surface of the sheet metal part of the heat conducting sheet outside the battery pack body, is electrically connected with the control module, and is used for refrigerating or heating under the control of the control module.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of battery pack especially relates to a lithium ion battery pack. BACKGROUND

[0002] With the more and more widely used battery, especially the application of lithium ion battery, the equipment using lithium ion battery is also more and more, and the use environment is also more and more complex. SUMMARY

[0003] One of the purposes of the utility model embodiment is to provide a lithium ion battery pack, and the application of the scheme is favorable for the lithium ion battery pack to adapt to various application occasions.

[0004] The utility model embodiment provides a lithium ion battery pack, which comprises:

[0005] A plurality of lithium ion battery modules, each lithium ion battery module comprises a vertical frame, two battery monomers and a heat conduction sheet metal part, a vertical plane spacing surface is arranged in the vertical frame, the spacing surface separates the vertical frame into a front frame and a rear frame, two battery monomers are arranged in the front frame and the rear frame, and each tab of the two battery monomers extends from the top frame to form two rows of front and rear facing tabs; the heat conduction sheet metal part comprises a middle region and two bending edges connected to the middle region and perpendicular to the middle region, the middle region covers the outer side of any battery monomer opposite to the spacing surface, and the two bending edges are tightly attached to the outer side of the two side frames of the vertical frame,

[0006] A plurality of lithium ion battery modules are sequentially arranged in a row on the front and rear end surfaces of the battery pack body, and the two opposite outer side surfaces of the battery pack body are the bending edges of the heat conduction sheet metal parts.

[0007] A temperature and voltage acquisition module is arranged in the battery pack body, and comprises a circuit and a temperature sensor electrically connected to the circuit,

[0008] An electrically controlled temperature adjusting sheet is arranged on the outer side of the heat conduction sheet metal part of the battery pack body, is electrically connected to the control module, and is used for refrigeration or heating under the control of the control module.

[0009] Optionally, the utility model further comprises,

[0010] A plurality of through holes are arranged in the four corners of each vertical frame, and four rows of through holes are formed on the battery pack body,

[0011] Four screw rods are sequentially arranged in the four rows of through holes, and the two ends of each screw rod are locked to tightly lock each lithium ion battery module in the space between the four screw rods.

[0012] Optionally, further comprising,

[0013] A plurality of bus bars made of conductive material are fixed to the top frame, the tab of each of the battery modules is tightly arranged between the top frame and each of the bus bars, and each of the lithium ion battery modules is connected in series and / or parallel through the connection between each of the tabs and each of the bus bars.

[0014] Optionally, further comprising,

[0015] A plurality of bus bars made of conductive material are arranged on each of the bus bars, and a plurality of through grooves are arranged on each of the bus bars,

[0016] The tab of each of the battery modules is arranged to extend through each of the through grooves of each of the bus bars, and is bent and welded to the top surface of the bus bar, and each of the lithium ion battery modules is connected in series and / or parallel through the connection between each of the tabs and each of the bus bars.

[0017] Optionally, a limiting groove is further arranged on the top frame of each of the battery modules, and the limiting groove is arranged in a column and is opposite to the notch formed on the top surface of the battery body,

[0018] The temperature and voltage acquisition module is in a strip shape and is arranged in the limiting groove arranged in a column,

[0019] The temperature and voltage acquisition module is arranged in the limiting groove arranged in a column,

[0020] Optionally, a stud is further arranged on the top surface of the top frame of each of the lithium ion battery modules,

[0021] Further comprising an insulating protective cover plate supported on the top surface of each of the studs and covering the top of the battery body.

[0022] Optionally, a plurality of front and rear through holes are arranged on the top frame and / or the bottom frame of each of the lithium ion battery modules.

[0023] Optionally, the spacing surface of each of the lithium ion battery modules is in a cross shape and is integrally connected with the bottom frame, the top frame, and the two side frames.

[0024] Optionally, an end plate is arranged at each of the front and rear ends of the battery body, each of the screws further extends through the two end plates, and each of the nuts locking each of the screws is tightly arranged on the outer end surface of the two end plates.

[0025] Optionally, a hoisting fixing part is further arranged on the outer end surface of the two end plates.

[0026] Optionally, insulating buffer sheets are further arranged between the two end plates and the battery pack body.

[0027] Optionally, a plurality of insulating spacer blocks are further fixed on the top surface of the battery pack body and arranged between the two bus bars with different polarities of electrodes, respectively, and the insulating spacer blocks are higher than the bus bars.

[0028] Optionally, the total positive electrode and the total negative electrode as the electrodes of the battery pack body extend out of the battery pack body, and an insulating protective sleeve is further sleeved on the total positive electrode and the total negative electrode.

[0029] Optionally, a first clamping part is arranged on the outer side surface of the two side frames of the vertical frame, respectively,

[0030] A second clamping part is arranged on the inner side surface of the two bent edges of the heat conduction sheet metal part, and the first clamping part and the second clamping part are clamped and connected.

[0031] Optionally, the battery assembly support further comprises:

[0032] A temperature guide sheet is arranged between the heat conduction sheet metal part and the temperature control sheet on the outer side of the battery pack body, respectively.

[0033] Optionally, the battery assembly support further comprises:

[0034] A heat preservation sheet is arranged on the outer side surface of the temperature control sheet, respectively.

[0035] As can be seen from the above, the temperature of each battery monomer in each battery module can be adjusted by adopting the embodiment, and the working temperature of the battery pack is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0036] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and do not limit the present application in any way.

[0037] Figure 1 The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and do not limit the present application in any way.

[0038] Figure 2 The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and do not limit the present application in any way.

[0039] Figure 3 The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and do not limit the present application in any way.

[0040] Figure 4 、 5 The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and do not limit the present application in any way.

[0041] Figure 6 A decomposition structure schematic view of the battery module provided by the embodiment of the utility model;

[0042] Figure 7 、 8 A three-dimensional structure schematic view of the battery module provided by the embodiment of the utility model;

[0043] Figure 9 A decomposition structure schematic view of the lithium ion battery pack provided by the second embodiment;

[0044] Figures 10-15 A three-dimensional structure schematic view of the lithium ion battery pack provided by the second embodiment.

[0045] 11: bottom frame; 12: top frame; 13: side frame; 14: object table; 15: busbar fixing part;

[0046] 16: spacing surface; 17: through hole; 18: hole part; 19: stud; 22: limiting groove;

[0047] 61: positioning column; 62: positioning hole; 63: first buckle part;

[0048] 21: busbar; 23: through groove; 24: temperature and voltage acquisition module; 25: needle seat interface;

[0049] 31: battery monomer; 32: tab;

[0050] 41: screw rod; 42: protective cover plate; 43: end plate; 44: hoisting hole; 45: insulating buffer piece;

[0051] 46: insulating spacing block; 51: insulating protective sleeve;

[0052] 7: heat conduction sheet metal part; 71: bent edge; 72: middle region; 73: second buckle part;

[0053] 81: electric control temperature adjusting sheet; 82: temperature conducting sheet; 83: heat preservation sheet. DETAILED DESCRIPTION

[0054] The utility model will be combined with the specific embodiment and the drawing to be explained in detail in the following, the schematic embodiment and the explanation of the utility model are used to explain the utility model, but not as the limitation of the utility model.

[0055] Embodiment one

[0056] Referring to Figures 1-8 The drawing.

[0057] The embodiment provides a kind of battery assembly support suitable for lithium ion battery pack and the battery module formed by using the assembly support.

[0058] The main body of the assembly bracket is a straight frame made of integrally formed insulating material, such as but not limited to a rigid plastic piece integrally injection molded. A vertical plane is provided in the center of the straight frame, and a spacer surface 16 is provided in the vertical plane. For the convenience of description, the side where the front surface of the spacer surface 16 is located is referred to as the front, and the side where the back surface of the spacer surface 16 is located is referred to as the back.

[0059] The straight frame includes a bottom frame 11, a top frame 12, and two vertical side frames 13 between the bottom frame 11 and the top frame 12. The two vertical side frames 13 are opposite to each other, and the top of the two vertical side frames 13 is connected to the left and right ends of the top frame 12, and the bottom of the two vertical side frames 13 is connected to the left and right ends of the bottom frame 11, forming a frame.

[0060] A horizontal placement table 14 is provided on the top of the bottom frame 11, and the left and right ends of the placement table 14 are connected to the lower ends of the two vertical side frames 13 of the straight frame, forming a placement frame, and the inner side surfaces of the two vertical frames are the vertical side frames of the placement frame. The spacer surface 16 separates the placement frame into a front frame located on the front surface of the spacer surface 16 and a back frame located on the back surface of the spacer surface 16.

[0061] When used for assembling a battery, a battery monomer 31 (or a cell monomer) is placed on the placement table 14 of the front frame, and another battery monomer 31 is placed on the placement table 14 of the back frame, and the left and right sides of the two battery monomers 31 are respectively limited to the inner sides of the left and right vertical side frames 13, and the spacer surface 16 is separated between the two battery monomers 31.

[0062] As an example of the embodiment, preferably, the width of the front and back direction of the top frame 12 is narrower than the width of the placement table 14, and is narrower than the width of the two vertical side frames 13, and the top frame 12 and the spacer surface 16 are located in the middle of the width of the placement table 14 and each vertical side frame 13, and the electrodes of the two battery monomers 31 located on both sides of the spacer surface 16 respectively extend from both sides of the top frame 12.

[0063] The top surface of the top frame 12 is also provided with a busbar fixing part 15. In this embodiment, the positive and negative tabs 32 of the battery monomer 21 extend out from the top end, and two busbar fixing parts 15 are provided on the top surface of the top frame 12, and the two busbars 21 have a certain spacing. The tabs 32 of the two battery monomers 21 extend out from the two sides of the top frame 12, are bent on the top frame 12 to connect the tabs 32 of the two battery monomers 31, and then the two busbars 21 are fixed on the top frame 12, so that the connected tabs 32 are tightly pressed under the busbar 21, realizing the connection between the two battery monomers 31, and obtaining a battery module. The two battery monomers 31 can be connected in parallel or in series. As can be seen from the above, compared with the prior art of welding the tabs 32 of the battery monomer 31 on the top surface of the busbar 21, this scheme can lock the busbar 21 on the top frame 12 by screwing, and tightly press on the tabs 32 to realize the fixation and electrical connection between the tabs 32, which is more convenient to operate, without the need for welding equipment, and the production cost is lower. When the battery pack is disassembled and the battery monomer 31 is replaced, the connection between the busbar 21 and the tab 32 can be removed by unscrewing the screw, which is flexible and convenient.

[0064] As can be seen from the above, the battery assembly support structure of this embodiment is compact, and the battery monomers 31 are installed on both sides of the isolation surface of the support, which can realize the series and parallel connection between the tabs 32 of the two battery monomers 31 on the top frame 12 to obtain a battery module. The bottom frame 11 of the vertical frame is used as the bottom support of the battery module, and the battery module structure is compact and easy to install, which is beneficial to improve the production efficiency of the battery pack.

[0065] As an example of this embodiment, through holes 17 are provided at the four top corners of the vertical frame of this embodiment, and the through holes 17 are located outside the storage frame, that is, the storage frame is located in the space between the through holes 17. The position of the screw rod 41 is higher than the plane where the busbar 21 is located.

[0066] During the assembly of the battery pack, multiple battery modules can be stacked front and back, and the electrodes of the top frame 12 of each battery module can be electrically connected according to the series and parallel connection relationship of each battery module of the battery pack. Four screw rods 41 pass through the through holes 17 at the four top corners of each battery module, and the screw rods 41 are locked to tightly fit each battery module, and multiple battery modules form a larger battery pack. In actual application, the number of battery modules can be increased or decreased according to application needs. During the adjustment, assembly and disassembly of the battery pack, the user only needs to adjust the screw rods 41 at the top corners, without the need to replace the shell. The use of this scheme is beneficial to reduce the production materials of the battery pack and reduce the production cost.

[0067] As an embodiment of the present application, a plurality of front-to-rear through holes 18 are hollowed out in the top frame 12 of the assembly support as weight reduction holes to reduce the weight of the battery module. These holes 18 are evenly distributed on the top frame 12.

[0068] Similarly, a plurality of front-to-rear through holes 18 are hollowed out in the bottom frame 11 as weight reduction holes, and the storage platform 14 is located on the top surface of the bottom frame 11.

[0069] As an embodiment of the present application, a spacing surface 16 in the shape of a "cross" can be used, but is not limited to this. The spacing surface 16 is hollowed out with front-to-rear through holes near the four corners of the central upright frame, and is integrally connected to the left and right side frames 13, the bottom frame 11, and the top frame 12 in the shape of a "cross". This structure is advantageous in saving material costs, reducing the weight of the battery module, and improving the heat dissipation effect of the two battery monomers 31 on both sides of the spacing surface 16.

[0070] As an embodiment of the present application, the top surface of the top frame 12 is flat. For example, the positive and negative electrodes of the battery monomer 31 extend from the top. In application, the busbar 21 made of conductive material can be fixed above the top frame 12 on each limiting platform. The tab 32 of each battery monomer 31 is bent on the top surface of the busbar 21 and welded on the busbar 21. The series or parallel connection between the battery monomers 31 is realized through the busbar 21, which is convenient for the assembly of the battery module.

[0071] As an embodiment of the present application, a plurality of studs 19 are arranged on the top surface of the top frame 12 of the upright frame. The top surfaces of the studs 19 are flush, and the openings of the screw holes of the studs 19 are upward. When the battery module is assembled, an insulating protective cover plate 42 is installed on the top surfaces of the studs 19. The electrode connecting components such as the busbar 21 are covered below the protective cover plate 42 to prevent dust and moisture.

[0072] Although it is described that, as an embodiment of the present application, the positive and negative tabs 32 of each battery monomer 31 extend from the top of the battery, and two busbars 21 are arranged on the top frame 12 of the assembly support, but in fact it is not limited to this. For example, one of the positive and negative tabs 32 of the battery monomer 31 extends from the top of the battery, and the other extends from the bottom of the battery. The busbar 21 can be arranged on the top surface of the top frame 12 and the bottom surface of the bottom frame 11, respectively, to connect the tabs 32 between the two battery monomers 31 and realize the series and parallel connection between the battery monomers 31.

[0073] In addition, as an illustration of the embodiment, a front-rear direction extending limiting groove 22 is further arranged in the middle of the top frame 12, the limiting groove 22 is spaced between the two bus bars 21, so that the temperature and voltage collection module 24 can be laid in the limiting groove 22, the temperature and voltage collection module 24 is provided with an extending part, the extending part is tightly attached to each bus bar 21, such as but not limited to being locked together with the bus bar 21 through the bus bar fixing part 15, so as to detect the temperature of the battery module in real time and ensure the safety of charging and discharging.

[0074] As an illustration of the embodiment, the lithium ion battery module of the embodiment further comprises a heat conduction sheet metal part 7, the heat conduction sheet metal part 7 comprises two opposite bending edges 71 and an intermediate region 72 between the two bending edges 71 and perpendicular to the two bending edges 71.

[0075] During assembly, the intermediate region 72 between the two bending edges 71 covers the outward outer side surface of the back spacing surface 16 of any battery monomer, the width of the intermediate region 72 is slightly wider than the width of the outer side surface of the battery monomer and the width between the two side frames 13 of the assembly support, and the two bending edges 71 on both sides of the intermediate region 72 cover the outer side surface of the two side frames 13 of the assembly support. The technical scheme of the embodiment can improve the thermal uniformity of the lithium ion battery module. The heat conduction sheet metal part 7 can be but not limited to an aluminum sheet bent into shape.

[0076] As an illustration of the embodiment, the battery monomer and the heat conduction sheet metal part 7 can be but not limited to be connected by pasting, such as but not limited to being pasted by double-sided adhesive.

[0077] In addition, a first clamping part 63 can be but not limited to be further arranged on the outer side surface of the two side frames 13 of the assembly support, and a second clamping part 73 matched with each first clamping part 63 can be arranged on the two bending edges 71 of the heat conduction sheet metal part 7. During assembly, each second clamping part 73 of the two bending edges 71 of the heat conduction sheet metal part 7 is matched and clamped with each first clamping part 63 on the two side frames 13, and the heat conduction sheet metal part 7 is fixed on the assembly support, so that the assembly support serves as the gravity bearing part of the heat conduction sheet metal part 7. The scheme is beneficial to further improve the structural stability of the battery module and improve the assembly efficiency.

[0078] Embodiment two

[0079] As shown in Figures 9-15 The embodiment provides a lithium ion battery pack composed of at least two lithium ion battery modules shown in the embodiment one.

[0080] Referring to the diagram, according to the series and parallel connection relationship between the battery modules, the battery modules are arranged in a row with their front and back faces (largest area) facing each other to form a battery pack body, so that the electrodes of two adjacent battery cells 31 that need to be electrically connected are located in the same row and extend from the top.

[0081] In the battery pack body, any two adjacent battery modules are positioned such that the heat-conducting sheet metal parts 7 covering the outer side of the battery module are face-to-face with the exposed outer side of the battery cell of the other battery module. Also, one side of any heat-conducting sheet metal part 7 in the battery pack body is in contact with a battery cell in its own battery module, and the other side is in contact with a battery cell in the opposite battery module. The heat-conducting sheet metal parts 7 outside the frame 13 of each battery module are arranged sequentially on both sides of the battery pack body. The through holes 17 at the four corners of each upright frame of each battery module are aligned sequentially, meaning the through holes 17 are on four parallel straight lines. Four screws 41 pass through the four corner through holes 17, connecting the battery modules together and locking the two ends of each screw 41, so that the upright frames of each lithium-ion battery module are arranged sequentially. Each battery cell 31 is encapsulated in the front and rear frames of each upright frame and locked in the space between the four screws 41, resulting in a fixed battery pack body. The tabs 32 of the battery cells 31 form two rows at the top of the battery pack body. The tabs 32 of each battery cell 31 extend from the top frame 12 of its respective upright frame to the top of the battery pack body. Connecting the tabs 32 extending to the top in series, parallel, or a combination of series and parallel connections yields the battery pack body, which provides power to the outside through the positive and negative terminals.

[0082] As can be seen from the above, the battery pack in this embodiment consists of multiple battery modules connected together by screws 41. The battery pack is flexible and easy to assemble, and its application helps to improve assembly efficiency and reduce production costs.

[0083] When any battery cell 31 or battery module is damaged, the user can loosen the locking screw 41 to remove the faulty battery cell 31 or battery module for replacement or removal. When reassembling the battery pack, simply re-thread the four screws 41 and lock them. Therefore, the battery pack of this embodiment is suitable for a variety of applications and is easy to maintain.

[0084] As an illustration of this embodiment, a plurality of busbars 21 made of conductive materials with good conductivity are provided, such as copper busbars 21.

[0085] As an embodiment of the present application, the electrodes of adjacent battery cells 31 are bent and tightly attached to the flat top surface of the top frame 12, the bus bars 21 are covered on the top surface of the tabs that need to be electrically connected to the same electrical node, and the bus bars 21 are locked on the top frames 12, so that the tabs 32 that need to be electrically connected are tightly pressed on the bottom surface of the same bus bar 21, tightly attached between the top frame 12 and the bus bar 21, and electrically connected together through the bus bar 21.

[0086] As another preferred embodiment of the present application, a square through slot 23 that can be passed through by each tab 32 can be provided on each bus bar 21, and the tabs 32 that need to be electrically connected to the same bus bar 21 extend from the through slot 23 on the bus bar 21, each bus bar 21 is locked on the top surface of the top frame 12, and then each tab 32 is bent and tightly attached to the top surface of the bus bar 21 on which it is located and laser welded to the top surface of the bus bar 21. With this scheme, the connection between each tab 32 and the bus plate is more stable. Moreover, the tabs are located on the top surface of the bus plate, and the series or parallel electrical connection relationship between each battery cell 31 is more obviously visible.

[0087] As an embodiment of the present application, bus bars 21 of multiple sizes can be designed according to the series or parallel relationship in the current batch of battery pack bodies, the number of battery modules contained, and the convenience of assembly. Two rows of bus bars 21 are formed on the top surface of the battery pack body, each row has multiple bus bars 21, and each bus bar 21 corresponds to multiple tabs 32 of battery cells 31.

[0088] As an embodiment of the present application, a limiting slot 22 is provided on the top of each upright frame, which can be but not limited to being composed of limiting flaps that are located on both sides of the limiting slot 22 and protrude above the top surface of the top frame 12. When the front and rear doors of each battery module are arranged opposite to each other, the limiting slots 22 on the top surface of each battery module are in front and back communication, and each bus bar 21 is located on both sides of the communicating limiting slots 22. A strip-shaped temperature and voltage acquisition module 24 is provided on the top surface of the battery pack body and laid in the limiting slots 22 with the slot opening facing each other. The temperature and voltage acquisition module 24 is provided with a circuit and a temperature sensor electrically connected to the circuit, and a plurality of extension parts extending to both sides are also provided on both sides of the strip-shaped temperature and voltage acquisition module 24 in the length direction. Each extension part is locked and electrically connected to the top surface of each bus bar 21 by extending from both sides, and the voltage of the electrical connection of each locked bus bar is acquired. The strip-shaped temperature and voltage acquisition module 24 detects the temperature of the predetermined detection position on the top surface of the battery pack body and acquires the voltage of the predetermined electrical node, and transmits each temperature detection value and voltage acquisition value to the charging and discharging control circuit to protect the safety of the battery pack. Moreover, the temperature detection data and voltage acquisition data can also be output to the user to enable the user to grasp the state of the battery pack in real time and discover abnormalities in time to ensure the safety of the battery pack.

[0089] As an embodiment of the present application, the temperature and voltage acquisition module 24 can be made of a flexible circuit board. The temperature and voltage acquisition module 24 can be connected to the temperature probe and the voltage acquisition module through the pin seat interface 25 at one end of the temperature and voltage acquisition module 24.

[0090] As an embodiment of the present application, at least two threaded rods 41 are arranged on the top surface of each top frame 12 of each battery module, and a threaded hole is arranged on each threaded rod 41, and the opening of the threaded hole faces upward. After the threaded rods 41 are locked, the electrode tabs 32 between the battery monomers 31 are electrically connected, and the temperature and voltage acquisition module 24 is fixed, a protective cover plate 42 is arranged on the top of the battery pack body, the bottom surface of the protective cover plate 42 is supported on the top of each threaded rod 19, the protective cover plate 42 is locked, the bus bars 21, the temperature and voltage acquisition module 24 and other electrical connection components are completely covered below the protective cover plate 42, and a predetermined gap is arranged between the protective cover plate 42 and the electrical connection components below. The design of the protective cover plate 42 is beneficial to improve the moisture-proof and dust-proof effect of the battery pack.

[0091] As an embodiment of the present application, the battery pack further comprises two end plates 43, and a through hole 17 is arranged on each end plate 43 and faces the through hole 17 at the four corners of each upright frame. During assembly, the flat surface of the two end plates 43 is attached to the end surface of the battery module at the two end sides of the battery pack body, the two ends of the four threaded rods 41 respectively pass through the through holes 17 at the four corners of the two end plates 43, and the fastening nuts are screwed on the outer end surface of the two end plates 43 to lock the battery modules between the two end plates 43, and the battery monomers 31 are encapsulated in the upright frame of each battery module. As an embodiment of the present application, a battery pack hoisting part is arranged on the outer end surface of the two end plates 43, for example, a metal plate can be used as the end plate 43, and an insulating layer is sprayed on the surface of the metal plate. In addition, at least one horizontally bent metal part can be further formed on the outer end surface of the end plate 43, and a hoisting hole 44 is arranged on the metal part. The technical solution of the present application is beneficial to improve the structural fastening degree of the battery pack body, and the external mounting structure of the end plate 43 hoisting is beneficial to improve the anti-shock performance of the battery pack during use.

[0092] As an embodiment of the present application, a soft insulating buffer piece 45 can be further arranged between the inner end surface of the two end plates 43 and the outer end surface of the battery module at the two ends to further improve the anti-shock performance of the battery pack.

[0093] As an embodiment of the present application, a plurality of insulating spacer blocks 46 are fixed on the top surface of the battery pack body, the insulating spacer blocks 46 are higher than the top surface of each bus bar 21, and each insulating spacer block 46 is arranged between two adjacent bus bars 21 with different electrodes to insulate and separate.

[0094] As an example of the embodiment, the total positive electrode and the total negative electrode of the battery pack body can be extended out of the two end plates 43 of the battery pack body and located outside the protective cover plate 42 to facilitate connection during application. In addition, an insulating protective sleeve 51 is sleeved on the total positive electrode and the total negative electrode to improve the moisture-proof and dust-proof performance.

[0095] As an example of the embodiment, the upright frame of each battery module is provided with a protruding positioning column 61 and a recessed (or through) positioning hole 62 on each of the opposite front and rear end surfaces of the bottom frame 11. The back surface of any positioning column 61 is opposite to a positioning hole 62 facing away from the end surface, and the back surface of any positioning hole 62 is opposite to a positioning column 61 facing away from the end surface, forming a one-to-one and opposite relationship. When assembling the battery pack body of the embodiment, the bottom frames 11 of any two adjacent battery modules are in face-to-face contact, and the positioning columns 61 on the opposite two bottom frames 11 are all limited in the positioning holes 62 of the opposite end bottom frames 11, thereby limiting the connection between the two opposite bottom frames 11 to avoid displacement, further facilitating positioning assembly, improving assembly efficiency, and improving the structural stability of the assembled battery pack.

[0096] As an example of the embodiment, an electrically controlled temperature adjusting sheet 81 can also be further laid on each side of the battery pack body covered with the heat conduction sheet metal part 7. Each electrically controlled temperature adjusting sheet 81 is fully attached to the outside of the heat conduction sheet metal part 7 on the side. The two electrically controlled temperature adjusting sheets 81 are connected in series and electrically connected with a control module (not shown in the figure) of the battery pack. The control module controls the work of the two electrically controlled temperature adjusting sheets 81 according to the temperature data transmitted by the temperature and voltage acquisition module 24 in real time.

[0097] For example, when the temperature and voltage acquisition module 24 detects that the current temperature is lower than the set lower limit of the temperature, the control module controls the electrical connection between the battery pack body and the electrically controlled temperature adjusting sheet 81 to drive the electrically controlled temperature adjusting sheet 81 to generate heat, and the heat is transmitted to each battery monomer through each heat conduction sheet metal part 7 to heat each battery monomer. When the temperature and voltage acquisition module 24 detects that the current temperature is higher than the set upper limit of the temperature, the control module controls the electrical connection between the battery pack body and the electrically controlled temperature adjusting sheet 81 to drive the electrically controlled temperature adjusting sheet 81 to refrigerate, and the heat of each battery monomer is transmitted to the electrically controlled temperature adjusting sheet 81 through each heat conduction sheet metal part 7 to cool each battery monomer. As can be seen from the above, the temperature of each battery monomer in each battery module can be adjusted by using the embodiment to ensure the working temperature of the battery pack.

[0098] As an illustration of this embodiment, a flexible and efficient heat-conducting sheet 82 can be further installed between the heat-conducting sheet 7 and the electronically controlled temperature regulating sheet 81 on the outside of the battery pack body, further improving the thermal conductivity between the two electronically controlled temperature regulating sheets 81 and each heat-conducting sheet 7, thereby improving the heat conduction capability between the electronically controlled temperature regulating sheet 81 and each battery cell, and improving the temperature regulation efficiency.

[0099] Furthermore, two heat insulation sheets 83 can be further provided on the outside of the two electrically controlled temperature regulating sheets 81. Each heat insulation sheet 83 covers the outer surface of each electrically controlled temperature regulating sheet 81, which on the one hand prevents heat loss, and on the other hand protects the electrically controlled temperature regulating sheet 81.

[0100] The specific assembly process is as follows:

[0101] 1. Battery module assembly, see Figures 6-8 As shown, after assembling two battery cells 31 onto an assembly bracket, a heat-conducting sheet metal part 7 is further installed to obtain a battery module. Multiple battery modules are obtained in this way.

[0102] 2. See Figure 10 As shown, according to the requirements of series and parallel connection, a predetermined number of battery modules are arranged face to face in a row, and the positioning holes 62 and positioning posts 61 on the bottom frame 11 of each module are fixed together for limiting.

[0103] 3. See Figure 11 As shown, end plates 43 (and insulating buffer sheets 45) are fixed at the front and rear ends of the arrayed battery modules, respectively. Screws 41 pass through the end plates 43 and the arrayed battery modules, and screws 41 are locked at the outer end faces of the two end plates 43.

[0104] 4. See Figure 12 As shown, insulating spacers 46 are installed between adjacent electrical nodes with different electrodes at the top of the battery pack.

[0105] 5. See Figure 13 As shown, a busbar 21 is installed on the top of the battery pack, and each tab 32 is electrically connected to the busbar 21. A temperature and voltage acquisition module 24 is also installed.

[0106] 6. See Figure 14 As shown, install the electrode protective sleeve and the protective cover plate 42.

[0107] 7. See also Figure 15 As shown, a temperature-conducting plate 82, an electronically controlled temperature regulating plate 81, and a heat-insulating plate 83 are installed.

[0108] The above-described embodiments do not constitute a limitation on the protection scope of the technical solutions. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solutions.

Claims

1. A lithium-ion battery pack, characterized by, It comprises: A plurality of lithium ion battery modules, each of which comprises an upright frame, two battery monomers and a heat-conducting sheet metal part, a vertical planar spacing surface is arranged in the upright frame, the spacing surface separates the upright frame into a front frame and a rear frame, two battery monomers are arranged in the front frame and the rear frame, and the tab of each of the two battery monomers extends from the top frame to form two rows of front and rear facing tabs, the heat-conducting sheet metal part comprises a middle region and two bent edges connected to the middle region and perpendicular to the middle region, the middle region covers the outer side of any of the battery monomers opposite to the spacing surface, and the two bent edges are tightly covered on the outer side of the two side frames of the upright frame, A plurality of lithium ion battery modules are arranged in a column in the battery group body in a front-to-back manner, and the two opposite outer sides of the battery group body are the bent edges of each of the heat-conducting sheet metal parts, A temperature and voltage acquisition module is arranged in the battery group body, which comprises a circuit and a temperature sensor electrically connected to the circuit, and is electrically connected to the control module, An electrically controlled temperature regulating sheet is arranged on the outer side of the heat-conducting sheet metal part outside the battery group body, is electrically connected to the control module, and is controlled by the control module to refrigerate or heat.

2. The lithium-ion battery of claim 1, wherein, It further comprises: A front-to-back through hole is arranged at each of the four corners of the upright frame, and four rows of through holes are formed on the battery group body, Four screw rods are sequentially arranged through the four rows of through holes, and the two ends of each screw rod are locked to tightly lock each lithium ion battery module in the space between the four screw rods.

3. The lithium-ion battery of claim 1, wherein, It further comprises: A plurality of bus bars made of conductive material are fixed to the top frame, the tabs of each battery module are tightly arranged between the top frame and each bus bar, and each lithium ion battery module is connected in series and / or parallel through the connection between the tabs and the bus bars.

4. The lithium-ion battery of claim 1, wherein, It further comprises: A plurality of bus bars made of conductive material are fixed to the top frame, the tabs of each battery module are tightly arranged between the top frame and each bus bar, and each lithium ion battery module is connected in series and / or parallel through the connection between the tabs and the bus bars.

5. The lithium ion battery pack according to claim 4, wherein A limiting groove is further arranged on the top frame of each battery module, and the limiting grooves in the column are arranged opposite to the slots on the top surface of the battery group body, The temperature and voltage acquisition module is in the form of a strip and is arranged in the limiting grooves in the column, The two sides of the temperature and voltage acquisition module are provided with outwardly extending protruding parts, the protruding parts are arranged to extend outwardly from the lateral opening and are electrically connected to the bus bars to acquire the voltage of each bus bar.

6. The lithium ion battery pack according to claim 2 or 3, wherein A stud is further arranged on the top surface of the top frame of each lithium ion battery module, An insulating protective cover plate is further arranged, which is supported on the top surface of each stud and covers the top of the battery group body. ​ 7. The lithium ion battery pack according to claim 1, wherein, a plurality of through holes are formed in the top frame and / or the bottom frame of each of the lithium ion battery modules.

8. The lithium ion battery pack according to claim 7, wherein, the spacing surface of each of the lithium ion battery modules is in the shape of a cross and is integrally formed with the bottom frame, the top frame, and the two side frames.

9. The lithium ion battery pack according to claim 2, wherein, an end plate is arranged at each of the front and rear ends of the battery pack body, each of the threaded rods passes through the end plates, and each of the nuts locking the threaded rods is locked to the outer end surface of the end plates.

10. The lithium ion battery pack according to claim 9, wherein, a lifting fixing portion is further arranged on the outer end surface of each of the end plates.

11. The lithium ion battery pack according to claim 9, wherein, an insulating buffer sheet is further arranged between each of the end plates and the battery pack body.

12. The lithium ion battery pack according to claim 4, wherein, a plurality of insulating spacing blocks are further fixed to the top surface of the battery pack body and are arranged between the two bus bars having different polarities, and the insulating spacing blocks are higher than the bus bars.

13. The lithium ion battery pack according to claim 1, wherein, the total positive electrode and the total negative electrode of the battery pack body extend out of the battery pack body, and an insulating protective sleeve is further arranged on the total positive electrode and the total negative electrode.

14. The lithium ion battery pack according to claim 1, wherein, a first clamping portion is arranged on the outer side surface of each of the two side frames of the vertical frame, a second clamping portion is arranged on the inner side surface of each of the two bent edges of the heat conduction sheet metal piece, and the first clamping portion and the second clamping portion are clamped and connected.

15. The lithium-ion battery of claim 1, further comprising including: a temperature guide sheet arranged between the heat conduction sheet metal piece and the temperature control sheet on the outer side of the battery pack body.

16. The lithium-ion battery of claim 1, wherein, further including: a heat preservation sheet arranged on the outer side surface of each of the temperature control sheets.

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