Battery pack with double-layer battery cell module

Abstract

The invention relates to the technical field of battery packs, in particular to a battery pack with a double-layer battery cell module, which comprises a front beam plate and a rear beam plate which are symmetrically arranged, a battery pack frame body is formed by the front beam plate and the rear beam plate together with side beam plates, and a bottom plate is arranged at the bottom of the battery pack frame body to form a battery pack box body; upper liquid cooling plate supporting beams are symmetrically arranged on the inner walls of the two side beam plates, and an upper liquid cooling plate is arranged on the upper liquid cooling plate supporting beams; the rear end of the upper liquid cooling plate is in contact with the inner wall of the rear beam plate, a liquid cooling plate through groove is formed in the front end of the upper liquid cooling plate, a liquid cooling pipe assembly and a front baffle are arranged in a longitudinal space corresponding to the liquid cooling plate through groove, and the liquid cooling pipe assembly is connected with the upper liquid cooling plate and the lower liquid cooling plate; and the battery pack box body is divided into a high-voltage box module mounting cavity and a battery cell module mounting cavity by the front baffle plate. The battery pack is simple in structure and compact in internal structure, and rapid and stable assembly of the high-voltage box module and the two battery cell modules can be realized; and the improved battery cell module is simpler in structure and easy to assemble and electrically connect.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery pack with a double-layer battery core module. Background Art

[0002] At present, new energy vehicles have attracted wide attention from all walks of life due to their excellent environmental performance. The requirements for new energy vehicles are also constantly increasing. As a new energy vehicle, electric vehicles are also developing in the direction of high safety, high energy ratio and light weight. The main factor that determines the mileage of electric vehicles is the power supply battery. Different specifications of power supply batteries can be selected for different models to meet driving requirements.

[0003] The power supply battery for electric vehicles is generally a battery pack composed of multiple battery modules, that is, multiple battery modules are stacked up and down in the same box, and then the battery modules are connected and connected to the outside through a high-voltage box. In this structure, since the battery modules are stacked close to each other and are in the same box as the high-voltage box module, they will affect each other during operation.

[0004] For double-layer battery packs that need to be stacked vertically, the box used to encapsulate the battery cell modules in traditional technology is not only complex in structure, but also has a narrow ventilation space because the inner wall of the box is completely in contact with the battery cell modules on all sides. The battery cell modules release a large amount of heat during operation. If effective cooling and heat dissipation treatment is not performed, the service life of the battery cell modules will be affected at the least, and safety accidents may occur due to excessive temperature at worst.

[0005] In addition, the core battery module is generally configured with a corresponding number of battery cells according to the size of the voltage to be output, and then all the battery cells are connected to output the voltage. The arrangement of the battery cells in the battery module is complex, which makes it inconvenient to connect the battery cells in series later, seriously affecting the assembly efficiency and power transmission effect of the battery module. In order to ensure the safe operation of the battery module, wire harnesses are often used to collect voltage, and traditional wire harness collection requires the coordination of multiple wire harnesses, which not only occupies a large space in the battery pack, but also relies heavily on manual labor when making electrical connections, and the degree of automation is extremely low.

[0006] Therefore, a new technical solution is urgently needed to solve the above technical problems. Summary of the invention

[0007] The object of the present invention is to overcome the above-mentioned problems of the prior art and provide a battery pack with a double-layer battery cell module, which is used to solve the problem that in traditional technology, the high-voltage box module and the battery cell module are directly stacked to share a space, which not only affects each other during operation, but also cannot firmly fix the two battery cell modules arranged vertically; the battery cell connection of the battery cell module has a complex structure, which is not convenient for subsequent series power transmission, and the use of wiring harnesses to collect battery cells requires the coordination of multiple wiring harnesses, which not only occupies a large space in the battery pack, but also relies heavily on manual labor when making electrical connections; and the high temperature generated in the box cannot be effectively cooled in a timely and effective manner.

[0008] The above objectives are achieved through the following technical solutions:

[0009] A battery pack with a double-layer battery cell module comprises a front beam plate and a rear beam plate which are symmetrically arranged, side beam plates are symmetrically arranged between the front beam plate and the rear beam plate to form a battery pack frame, and a bottom plate is arranged at the bottom of the battery pack frame to form a battery pack box; a lower liquid cooling plate embedding groove for embedding a lower liquid cooling plate is formed between the battery pack frame and the bottom plate; upper liquid cooling plate support beams are symmetrically arranged on the inner walls of the two side beam plates, and an upper liquid cooling plate is arranged on the upper liquid cooling plate support beam; the rear end of the upper liquid cooling plate contacts the inner wall of the rear beam plate, the front end is provided with a liquid cooling plate through groove, and a liquid cooling pipe assembly and a front baffle are arranged in the longitudinal space corresponding to the liquid cooling plate through groove, the liquid cooling pipe assembly is respectively connected to the upper liquid cooling plate and the lower liquid cooling plate; the front baffle separates the battery pack box into a high-voltage box module installation cavity and a battery cell module cavity The battery cell module installation cavity is divided into an upper battery cell module installation cavity and a lower battery cell module installation cavity which are arranged in upper and lower layers by the upper liquid cooling plate, an upper battery cell module module is arranged in the upper battery cell module installation cavity, and a lower battery cell module module is arranged in the lower battery cell module installation cavity; an upper front baffle support and a lower front baffle support are arranged on the side of the front baffle plate, and a high-voltage box module electrical connection seat module is arranged on the upper front baffle support and the lower front baffle support respectively, which is used for electrical connection between the upper battery cell module module and the lower battery cell module module and the high-voltage box module; a battery cell module reversing electrical connection assembly is arranged on the inner wall of the rear beam plate, which is used for realizing the series connection between the upper battery cell module module and the lower battery cell module module; and it also includes a box cover which can seal the top of the battery pack box.

[0010] Further, the liquid cooling pipe assembly includes an upper liquid inlet and an upper liquid outlet arranged on the upper liquid cooling plate corresponding to both sides of the liquid cooling plate slot; a lower liquid inlet and a lower liquid outlet are symmetrically arranged on the lower liquid cooling plate corresponding to the liquid cooling plate slot; a vertical lower liquid inlet pipe is arranged on the lower liquid inlet, and a horizontal upper liquid inlet pipe is arranged on the upper liquid inlet, the upper liquid inlet pipe is connected to the lower liquid inlet pipe through a three-way liquid inlet joint, and a liquid inlet main pipe is connected to the top interface of the three-way liquid inlet joint; a vertical lower liquid outlet pipe is arranged on the lower liquid outlet, and a horizontal upper liquid outlet pipe is arranged on the upper liquid outlet, the upper liquid outlet pipe is connected to the lower liquid outlet pipe through a three-way liquid outlet joint, and a liquid outlet main pipe is connected to the top interface of the three-way liquid outlet joint.

[0011] Furthermore, the liquid inlet main pipe and the liquid outlet main pipe are respectively connected with a liquid inlet joint and a liquid outlet joint, and the liquid inlet joint and the liquid outlet joint are both embedded in the front beam plate.

[0012] Furthermore, the upper battery cell module and the lower battery cell module have the same specifications and both include a plurality of battery cells, one side of the battery cell is provided with a positive pole, and the other side is provided with a negative pole, the battery cells are crossed with each other and stacked horizontally to form a battery cell module, the battery cell module includes a first battery cell module electrical connection edge and a second battery cell module electrical connection edge arranged on both sides, a first electrical connection component is arranged on the first battery cell module electrical connection edge, and a second electrical connection component is arranged on the second battery cell module electrical connection edge.

[0013] Furthermore, the first electrical connection component and the second electrical connection component have the same specifications and both include a wiring harness isolation plate, one side of the wiring harness isolation plate is used to fit the electrical connection edge of the first battery cell module or the electrical connection edge of the second battery cell module, and the other side is provided with mutually parallel aluminum bar mounting positions and flexible circuit board mounting positions, an aluminum bar is provided on the aluminum bar mounting position, and a flexible circuit board is provided on the flexible circuit board mounting position, the aluminum bar is connected to the flexible circuit board through a first bus, and a connector is provided at one end of the flexible circuit board.

[0014] Further, the aluminum bar installation position includes external aluminum bar positions arranged on both sides, and multiple positive and negative aluminum bar positions arranged between the two external aluminum bar positions; the aluminum bar includes an external aluminum bar corresponding to the external aluminum bar position, and positive and negative aluminum bars corresponding to the positive and negative aluminum bar positions; the external aluminum bar position is provided with an external aluminum bar embedding groove for the external aluminum bar to be embedded, and a single-pole through groove for sleeve-mounting an electrode of a single battery cell is provided in the external aluminum bar embedding groove; the positive and negative aluminum bar positions are provided with positive and negative aluminum bar embedding grooves for the positive and negative aluminum bars to be embedded, and positive and negative through grooves for sleeve-mounting electrodes of two battery cells are provided in the positive and negative aluminum bar embedding grooves.

[0015] Furthermore, the positive and negative electrode through grooves include a positive electrode through groove and a negative electrode through groove arranged in the positive and negative electrode aluminum bar embedding grooves, the positive electrode through groove is used for the positive electrode of a single battery cell to extend into, and the negative electrode through groove is used for the negative electrode of a single battery cell to extend into; the positive and negative electrode aluminum bars include a positive electrode connecting portion that can act on the positive electrode through groove, and a negative electrode connecting portion that can act on the negative electrode through groove.

[0016] Furthermore, the battery cell module reversing electrical connection assembly includes an upper bracket and a lower bracket arranged on the inner wall of the rear beam plate, the upper bracket is provided with an upper copper bar mounting seat module, and the lower bracket is provided with a lower copper bar mounting seat module; a longitudinally arranged series copper bar is arranged between the upper copper bar mounting seat module and the lower copper bar mounting seat module, and the series copper bar includes a copper bar body and a copper bar upper connecting end and a copper bar lower connecting end arranged at both ends of the copper bar body.

[0017] Furthermore, a protective plate is provided on the top of the front baffle and the rear beam plate, including a protective plate body, and support plates vertically arranged on both sides of the protective plate body, and an outwardly folded right-angle connecting edge is provided on the bottom side of the support plate, and protective plate connecting holes are provided on the right-angle connecting edge, the front baffle, and the top of the rear beam plate, which are screwed together by protective plate screws.

[0018] Furthermore, a plurality of sockets are provided on the front beam plate, and inner sides of the sockets are communicated with the high-voltage box module installation cavity.

[0019] Beneficial Effects

[0020] The battery pack with double-layer battery cell modules provided by the present invention is divided into an independent high-voltage box module installation cavity and an upper battery cell module installation cavity and a lower battery cell module installation cavity arranged up and down by a front baffle, thereby providing independent installation space for the high-voltage box module and two battery cell modules that need to be stacked vertically, which can not only achieve orderly installation, but also do not interfere with each other during work. The two battery cell modules are cooled and dissipated synchronously by a double-layer liquid cooling plate structure. By setting a liquid cooling plate groove for the pipeline to pass through at one end of the upper liquid cooling plate, the installation of the pipeline can be greatly facilitated, and at the same time, other space in the battery pack box will not be occupied, so that the layout in the box will be more concise. In addition, by stacking a plurality of battery cells horizontally according to the positive and negative poles to form the first battery cell module electrical connection edge and the second battery cell module electrical connection edge, and respectively configuring electrical connection components of the same specifications, each battery cell can be connected in series, not only no external wiring is exposed to the outside of the battery cell module, but also the structure is more compact. In summary, the battery pack not only has a simple structure and a compact internal structure, but also can realize the rapid and stable assembly of the high-voltage box module and the two battery cell modules; and the improved battery cell module structure is simpler and easier to assemble and electrically connect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a battery pack with a double-layer battery cell module according to the present invention;

[0022] Figure 2 A cross-sectional view of a battery pack with a double-layer battery cell module according to the present invention;

[0023] Figure 3 A schematic diagram of the battery pack with a double-layer battery cell module according to the present invention with its cover opened;

[0024] Figure 4 A cross-sectional view showing the connection between the protective plate and the box body of the battery pack with a double-layer battery cell module according to the present invention;

[0025] Figure 5 It is a schematic structural diagram of an upper liquid cooling plate support beam in a battery pack with a double-layer battery cell module according to the present invention;

[0026] Figure 6 A schematic diagram of a compaction assembly in a battery pack having a double-layer battery cell module according to the present invention;

[0027] Figure 7 A schematic diagram showing the application of a switching electrical connection assembly for a battery cell module in a battery pack having a double-layer battery cell module according to the present invention from a first viewing angle;

[0028] Figure 8 A schematic diagram from a second perspective of the application of the cell module reversing electrical connection assembly in the battery pack with a double-layer cell module according to the present invention;

[0029] Fig. 9 It is a structural schematic diagram of a mounting seat module of a battery pack with a double-layer battery cell module according to the present invention;

[0030] Fig.10 This is a schematic diagram of the structure of a liquid cooling tube assembly in a battery pack with a double-layer battery cell module according to the present invention;

[0031] Fig.11 A schematic diagram of the connection between the battery cell module and the electrical connection assembly in the battery pack with a double-layer battery cell module according to the present invention;

[0032] Fig.12 It is a schematic structural diagram of the electrical connection assembly in the battery pack with a double-layer battery cell module according to the present invention.

[0033] Graphic marking:

[0034] 1-battery pack box, 101-battery pack frame, 102-front beam plate, 103-rear beam plate, 104-side beam plate, 105-bottom plate, 106-lower liquid cooling plate embedded groove, 107-upper liquid cooling plate support beam;

[0035] 2-upper liquid cooling plate, 201-liquid cooling plate slot, 202-upper liquid inlet, 203-upper liquid outlet;

[0036] 3-lower liquid cooling plate, 301-lower liquid inlet, 302-lower liquid outlet;

[0037] 4-front baffle, 401-front baffle connecting block, 402-front baffle upper bracket, 403-front baffle lower bracket, 404-high voltage box module electrical connection seat module;

[0038] 5-liquid cooling pipe assembly, 501-upper liquid inlet pipe, 502-upper liquid outlet pipe, 503-lower liquid inlet pipe, 504-lower liquid outlet pipe, 505-three-way liquid inlet joint, 506-three-way liquid outlet joint, 507-liquid inlet main pipe, 508-liquid outlet main pipe, 509-liquid inlet joint, 510-liquid outlet joint;

[0039] 6-cell module reversing electrical connection assembly, 601-upper bracket, 602-lower bracket, 603-upper copper bar mounting seat module, 604-lower copper bar mounting seat module, 605-series copper bar, 606-copper bar body, 607-copper bar upper connection end, 608-copper bar lower connection end;

[0040] 7-wiring harness isolation plate, 701-aluminum bar installation position, 702-flexible circuit board installation position, 703-external aluminum bar position, 704-positive and negative aluminum bar positions, 705-external aluminum bar embedding groove, 706-monopolar through groove, 707-positive and negative aluminum bar embedding groove, 708-positive and negative through groove, 709-positive through groove, 710-negative through groove;

[0041] 8-aluminum bar, 801-external aluminum bar, 802-positive and negative aluminum bars, 803-positive electrode connection part, 804-negative electrode connection part;

[0042] 9-protective plate, 901-protective plate body, 902-support plate, 903-right angle connecting edge, 904-protective plate connecting hole, 905-protective plate screw;

[0043] 10-compacted component, 1001-PC board, 1002-vacuum board, 1003-foam board;

[0044] 11-box cover, 12-socket, 13-high-voltage box module installation cavity, 14-upper battery cell module installation cavity, 15-lower battery cell module installation cavity, 16-upper battery cell module, 17-lower battery cell module, 18-high-voltage box module, 19-bracket slot, 20-mounting seat, 21-locking nut, 22-locking bolt, 23-battery cell module, 24-battery cell, 25-first electrical connection component, 26-second electrical connection component, 27-flexible circuit board, 28-first bus, 29-second bus, 30-connector, 31-copper bus. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below based on the accompanying drawings and embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] like Figure 1 to Figure 5 As shown, the present solution provides a battery pack with a double-layer battery cell module, including a symmetrically arranged front beam plate 102 and a rear beam plate 103, a side beam plate 104 is symmetrically arranged between the front beam plate 102 and the rear beam plate 103, forming a battery pack frame 101, and a bottom plate 105 is arranged at the bottom of the battery pack frame 101 to form a battery pack box 1; a lower liquid cooling plate embedding groove 106 for embedding a lower liquid cooling plate 3 is formed between the battery pack frame 101 and the bottom plate 105; upper liquid cooling plate support beams 107 are symmetrically arranged on the inner walls of the two side beam plates 104, and an upper liquid cooling plate 2 is arranged on the upper liquid cooling plate support beams 107;

[0047] The rear end of the upper liquid cooling plate 2 contacts the inner wall of the rear beam plate 103, and a liquid cooling plate groove 201 is opened at the front end, and a liquid cooling pipe assembly 5 and a front baffle 4 are arranged in the longitudinal space corresponding to the liquid cooling plate groove 201, and the liquid cooling pipe assembly 5 is respectively connected to the upper liquid cooling plate 2 and the lower liquid cooling plate 3 to provide cooling liquid circulation; the front baffle 4 divides the battery pack body 1 into a high-voltage box module installation cavity 13 and a battery cell module installation cavity; the bottom of the front baffle 4 is vertically connected to the lower liquid cooling plate 3, and the top is connected to the inner walls of the two side beam plates 104 through a pair of front baffle connecting blocks 401 to achieve vertical support.

[0048] The cell module installation cavity is divided into an upper cell module installation cavity 14 and a lower cell module installation cavity 15 arranged up and down by the upper liquid cooling plate 2, an upper cell module 16 is arranged in the upper cell module installation cavity 14, and a lower cell module 17 is arranged in the lower cell module installation cavity 15;

[0049] The side of the front baffle plate 4 is provided with a front baffle plate upper bracket 402 and a front baffle plate lower bracket 403, and a high-voltage box module electrical connection seat module 404 is respectively provided on the front baffle plate upper bracket 402 and the front baffle plate lower bracket 403, which is used for electrical connection between the upper battery cell module module 16 and the lower battery cell module module 17 and the high-voltage box module 18;

[0050] The inner wall of the rear beam plate 103 is provided with a cell module reversing electrical connection assembly 6 for realizing the series connection between the upper cell module module 16 and the lower cell module module 17;

[0051] It also includes a box cover 11 that can seal the top of the battery pack box 1.

[0052] Through the above-mentioned battery pack structure, the inner side of the battery pack case 1 is divided into a high-voltage box module installation cavity 13 for installing the high-voltage box module 18, an upper battery cell module installation cavity 14 for installing the upper battery cell module 16, and a lower battery cell module installation cavity 15 for installing the lower battery cell module 17, and the upper battery cell module 16 and the lower battery cell module 17 are stacked vertically.

[0053] The connection between the two battery cell modules and the high voltage box 18 is directly achieved through the corresponding high voltage box module electrical connection seat modules 404;

[0054] The series connection between two battery cell modules is directly achieved through the battery cell module reversing electrical connection assembly 6 disposed on the rear beam plate 103 .

[0055] like Figure 6 As shown, in order to enable the upper cell module 16 and the lower cell module 17 to be tightly fixed in their respective mounting cavities, in this embodiment, a compaction assembly 10 is respectively arranged between the upper cell module 16 and the inner wall of the upper cell module mounting cavity 14, and between the lower cell module 17 and the inner wall of the lower cell module mounting cavity 15, including a PC board 1001, a vacuum board 1002 and a foam board 1003 connected in sequence, wherein:

[0056] The PC board 1001 has the characteristics of impact resistance, high temperature resistance and sound insulation;

[0057] The foam board 1002 has the characteristics of being elastic, light, quick pressure-sensitive fixing, easy to use, flexible to bend, ultra-thin, and reliable in performance, and can effectively ensure flexible compression between the battery module and the front baffle and the rear end plate without causing damage to the battery cells in the battery module.

[0058] The vacuum panel 1003 has excellent thermal insulation performance, high-strength structure and good anti-corrosion performance, and is light in weight, good in toughness, and can withstand a certain pressure and load. In this embodiment, the vacuum panel can further realize flexible changes in space.

[0059] The front beam plate 102 is provided with a plurality of sockets 12 , the inner sides of the sockets 12 are connected to the high-voltage box module installation cavity 13 , and are used for quickly plugging the high-voltage box module 18 installed in the high-voltage box module installation cavity 13 with an external connector.

[0060] like Fig.10 As shown, the liquid cooling pipe assembly 5 in this embodiment includes an upper liquid inlet 202 and an upper liquid outlet 203 arranged on the upper liquid cooling plate 2 corresponding to both sides of the liquid cooling plate through groove 201; a lower liquid inlet 301 and a lower liquid outlet 302 are symmetrically arranged on the lower liquid cooling plate 3 corresponding to the liquid cooling plate through groove 201; a vertical lower liquid inlet pipe 503 is arranged on the lower liquid inlet 301, and a horizontal upper liquid inlet pipe 501 is arranged on the upper liquid inlet 202, and the upper liquid inlet pipe 501 It is connected to the lower liquid inlet pipe 503 through a three-way liquid inlet joint 505, and a liquid inlet main pipe 507 is connected to the top interface of the three-way liquid inlet joint 505; a vertical lower liquid outlet pipe 504 is arranged on the lower liquid outlet 302, and a horizontal upper liquid outlet pipe 502 is arranged on the upper liquid outlet 203, the upper liquid outlet pipe 502 is connected to the lower liquid outlet pipe 504 through a three-way liquid outlet joint 506, and a liquid outlet main pipe 508 is connected to the top interface of the three-way liquid outlet joint 506.

[0061] In this embodiment, the lower liquid inlet pipe 503 and the lower liquid outlet pipe 504 are confined in the longitudinal space where the liquid cooling plate groove 201 is located, so that the liquid cooling pipe assembly 5 can be fitted to the liquid cooling plate as much as possible, thereby achieving the purpose of liquid cooling circulation, and can also effectively store the pipeline so that it does not occupy too much space in the battery pack box 1, which is also convenient for the operator to assemble.

[0062] In addition, the liquid inlet main pipe and the liquid outlet main pipe 508 are respectively connected to a liquid inlet joint 509 and a liquid outlet joint 510, and the liquid inlet joint 509 and the liquid outlet joint 510 are both embedded in the front beam plate 102 so as to be connected to an external coolant circulation device, thereby realizing the synchronous provision of liquid cooling circulation to the upper liquid cooling plate 2 and the lower liquid cooling plate 2 through the liquid cooling pipe assembly 5.

[0063] like Fig.11 and Fig.12As shown, the upper battery cell module 16 and the lower battery cell module 17 have the same specifications and both include a plurality of battery cells 24. A positive pole is provided on one side of the battery cell 24 and a negative pole is provided on the other side. The battery cells are crossed with each other and stacked horizontally to form a battery cell module 23. The battery cell module 23 includes a first battery cell module electrical connection edge and a second battery cell module electrical connection edge provided on both sides. A first electrical connection component 25 is provided on the first battery cell module electrical connection edge for connecting the positive and negative poles of two adjacent battery cells located on the first battery cell module electrical connection edge; a second electrical connection component 26 is provided on the second battery cell module electrical connection edge for connecting the positive and negative poles of two adjacent battery cells located on the second battery cell module electrical connection edge.

[0064] Specifically, the first electrical connection component 25 and the second electrical connection component 26 have the same specifications and both include a wiring harness isolation plate 7. One side of the wiring harness isolation plate 7 is used to fit the electrical connection edge of the first battery cell module or the electrical connection edge of the second battery cell module, and the other side is provided with an aluminum bar mounting position 701 and a flexible circuit board mounting position 702 which are parallel to each other. An aluminum bar 8 is provided on the aluminum bar mounting position 701, and a flexible circuit board 27 is provided on the flexible circuit board mounting position 702. The aluminum bar 8 is connected to the flexible circuit board 27 through a first bus 28. A connector 30 is provided at one end of the flexible circuit board 27. The connector 30 is used to be plugged into an external battery management system to realize data collection and transmission.

[0065] The aluminum bar installation position 701 includes external aluminum bar positions 703 arranged on both sides, and a plurality of positive and negative aluminum bar positions 704 arranged between the two external aluminum bar positions 703;

[0066] The aluminum bar 8 includes an external aluminum bar 801 corresponding to the external aluminum bar position 703, and positive and negative aluminum bars 802 corresponding to the positive and negative aluminum bar positions 704;

[0067] The external aluminum bar position 703 is provided with an external aluminum bar embedding groove 705 for embedding the external aluminum bar 801, and the external aluminum bar embedding groove 705 is provided with a single-pole through groove 706 for sleeve-mounting the electrode of a single battery cell 24;

[0068] The positive and negative aluminum bar positions 704 are provided with positive and negative aluminum bar embedding grooves 707 for embedding the positive and negative aluminum bars 802, and the positive and negative aluminum bar embedding grooves 707 are provided with positive and negative electrode through grooves 708 for sleeve mounting the electrodes of the two battery cells 24;

[0069] The external aluminum bar 801 described in this embodiment is used for connecting the battery cell module with the high-voltage box module electrical connection seat module 404 or the battery cell module reversing electrical connection component 6, which is convenient for external output voltage or external charging of the battery cell module; and the positive and negative aluminum bars are used to connect in series the positive and negative electrodes of two adjacent battery cells located on the electrical connection edge of the first battery cell module or the electrical connection edge of the second battery cell module. The above-mentioned connection method ultimately realizes the series connection of the individual battery cells that make up the battery cell module.

[0070] In this embodiment, the positive and negative electrode through grooves 708 include a positive electrode through groove 709 and a negative electrode through groove 710 disposed in the positive and negative electrode aluminum bar embedding grooves 707, wherein the positive electrode through groove 709 is used for the positive electrode of a single battery cell 24 to extend therein, and the negative electrode through groove 710 is used for the negative electrode of a single battery cell 24 to extend therein;

[0071] The positive and negative aluminum bars 802 include a positive electrode connection portion 803 that can act on the positive electrode through slot 709, and a negative electrode connection portion 804 that can act on the negative electrode through slot 710; this structure can achieve precise electrical connection between the positive and negative electrodes of the two connected battery cells 24;

[0072] As an optimization of this solution, a copper busbar 31 is further provided on the outside of the positive and negative aluminum bars 802, and the copper busbar 31 is connected to the flexible circuit board 27 through the second busbar 29. In this embodiment, the copper busbar 31 is added to increase the current capacity of the battery module, which helps to reduce the temperature rise of the battery and improve the energy density.

[0073] In addition, in this embodiment, the first busbar 28 and the second busbar 29 are both made of nickel sheets and are connected by welding.

[0074] like Figure 7 to Figure 9 As shown, the cell module reversing electrical connection assembly 6 in this embodiment includes an upper bracket 601 and a lower bracket 602 arranged on the inner wall of the rear beam plate 103, the upper bracket 601 is provided with an upper copper bar mounting seat module 603, and the lower bracket 602 is provided with a lower copper bar mounting seat module 604; a longitudinally arranged series copper bar 605 is arranged between the upper copper bar mounting seat module 603 and the lower copper bar mounting seat module 604, and the series copper bar 605 is arranged in series. 05 includes a copper busbar body 606 and an upper copper busbar connection end 607 and a lower copper busbar connection end 608 arranged at both ends of the copper busbar body 606, the upper copper busbar connection end 607 is electrically connected to the external aluminum bar 801 of the upper battery cell module 16, and the lower copper busbar connection end 608 is electrically connected to the external aluminum bar 801 of the lower battery cell module 17, thereby realizing the longitudinal series connection of the upper battery cell module 16 and the lower battery cell module 17.

[0075] In this embodiment, the front baffle upper bracket 402, the front baffle lower bracket 403, the upper bracket 601 and the lower bracket 602 have the same specifications, are triangular brackets, and have a bracket slot 19 on the top horizontal edge;

[0076] The high-voltage box module electrical connection seat module 404, the upper copper bar mounting seat module 603 and the lower copper bar mounting seat module 604 have the same specifications, and all include a mounting seat 20 that can be snapped into the bracket slot 19. The mounting seat 20 is embedded with a locking nut 21 and is provided with a matching locking bolt 22. Through the interaction between the locking bolt 22 and the locking nut 21, the connecting ends of the external aluminum bar 801 and the series copper bar 605 can be pressed against each other for electrical connection, which has a good guarantee for the firmness after connection.

[0077] In addition, if Figure 3 and Figure 4 As shown, in this embodiment, a protective plate 9 capable of sealing the upper battery cell module installation cavity 14 is further provided on the top of the front baffle plate 4 and the rear beam plate 103, and the protective plate 9 includes a protective plate body 901, and support plates 902 vertically arranged on both sides of the protective plate body 901, and an outwardly folded right-angle connecting edge 903 is provided on the bottom side of the support plate 902, and a protective plate connecting hole 904 is provided on the right-angle connecting edge 903, the front baffle plate 4, and the top of the rear beam plate 103, which is screwed together by protective plate screws 905.

[0078] In this embodiment, a protective plate 9 with a support plate 902 is used to provide a longitudinal height extension for the battery cell modules located on the upper layer. Furthermore, by selecting protective plates 9 with support plates 902 of different heights, it can adapt to battery cell modules of different heights.

[0079] The battery pack with a double-layer battery cell module according to claim 1 is characterized in that.

[0080] The above description is only for illustrating the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack with a double-layer battery cell module, characterized in that: The battery pack comprises a front beam plate (102) and a rear beam plate (103) which are symmetrically arranged, a side beam plate (104) being symmetrically arranged between the front beam plate (102) and the rear beam plate (103) to form a battery pack frame (101), and a bottom plate (105) being arranged at the bottom of the battery pack frame (101) to form a battery pack box (1); a lower liquid cooling plate embedding groove (106) for embedding a lower liquid cooling plate (3) is formed between the battery pack frame (101) and the bottom plate (105); upper liquid cooling plate support beams (107) are symmetrically arranged on the inner walls of the two side beam plates (104), and an upper liquid cooling plate (2) is arranged on the upper liquid cooling plate support beams (107); The rear end of the upper liquid cooling plate (2) contacts the inner wall of the rear beam plate (103), the front end is provided with a liquid cooling plate through groove (201), and a liquid cooling pipe assembly (5) and a front baffle (4) are arranged in the longitudinal space corresponding to the liquid cooling plate through groove (201), the liquid cooling pipe assembly (5) being connected to the upper liquid cooling plate (2) and the lower liquid cooling plate (3) respectively; the front baffle (4) divides the battery pack box (1) into a high-voltage box module installation cavity (13) and a battery cell module installation cavity; The battery cell module installation cavity is divided by the upper liquid cooling plate (2) into an upper battery cell module installation cavity (14) and a lower battery cell module installation cavity (15) arranged one above the other, the upper battery cell module installation cavity (14) being provided with an upper battery cell module (16), and the lower battery cell module installation cavity (15) being provided with a lower battery cell module (17); A front baffle upper bracket (402) and a front baffle lower bracket (403) are provided on the side of the front baffle (4), and a high-voltage box module electrical connection seat module (404) is provided on the front baffle upper bracket (402) and the front baffle lower bracket (403) respectively, for electrically connecting the upper battery cell module module (16) and the lower battery cell module module (17) with the high-voltage box module (18); The inner wall of the rear beam plate (103) is provided with a cell module reversing electrical connection assembly (6) for realizing the series connection between the upper cell module (16) and the lower cell module (17); It also includes a box cover (11) capable of sealing the top of the battery pack box (1).

2. The battery pack with a double-layer battery cell module according to claim 1, characterized in that: The liquid cooling pipe assembly (5) comprises an upper liquid inlet (202) and an upper liquid outlet (203) arranged on the upper liquid cooling plate (2) corresponding to the two sides of the liquid cooling plate slot (201); a lower liquid inlet (301) and a lower liquid outlet (302) are symmetrically arranged on the lower liquid cooling plate (3) corresponding to the liquid cooling plate slot (201); a vertical lower liquid inlet pipe (503) is arranged on the lower liquid inlet (301), and a horizontal upper liquid inlet pipe (501) is arranged on the upper liquid inlet (202); the upper liquid inlet pipe (501) is symmetrically arranged on the lower liquid cooling plate (3) corresponding to the liquid cooling plate slot (201); The lower liquid inlet pipe (503) is connected via a three-way liquid inlet joint (505), and a liquid inlet main pipe (507) is connected to the top interface of the three-way liquid inlet joint (505); a vertical lower liquid outlet pipe (504) is provided on the lower liquid outlet (302), and a horizontal upper liquid outlet pipe (502) is provided on the upper liquid outlet (203); the upper liquid outlet pipe (502) is connected to the lower liquid outlet pipe (504) via a three-way liquid outlet joint (506), and a liquid outlet main pipe (508) is connected to the top interface of the three-way liquid outlet joint (506).

3. The battery pack with a double-layer battery cell module according to claim 2, characterized in that: The liquid inlet main pipe and the liquid outlet main pipe (508) are respectively connected to a liquid inlet joint (509) and a liquid outlet joint (510), and the liquid inlet joint (509) and the liquid outlet joint (510) are both embedded in the front beam plate (102).

4. The battery pack with a double-layer battery cell module according to claim 1, characterized in that: The upper battery cell module (16) and the lower battery cell module (17) have the same specifications and both include a plurality of battery cells (24). A positive electrode is provided on one side of the battery cell (24) and a negative electrode is provided on the other side. The battery cells are intersected with each other and stacked horizontally to form a battery cell module (23). The battery cell module (23) includes a first battery cell module electrical connection edge and a second battery cell module electrical connection edge provided on both sides. A first electrical connection component (25) is provided on the first battery cell module electrical connection edge, and a second electrical connection component (26) is provided on the second battery cell module electrical connection edge.

5. The battery pack with a double-layer battery cell module according to claim 4, characterized in that: The first electrical connection component (25) and the second electrical connection component (26) have the same specifications and both include a wiring harness isolation plate (7). One side of the wiring harness isolation plate (7) is used to fit the electrical connection edge of the first battery module or the electrical connection edge of the second battery module, and the other side is provided with an aluminum bar mounting position (701) and a flexible circuit board mounting position (702) parallel to each other. An aluminum bar (8) is provided on the aluminum bar mounting position (701), and a flexible circuit board (27) is provided on the flexible circuit board mounting position (702). The aluminum bar (8) is connected to the flexible circuit board (27) via a first bus (28), and a connector (30) is provided at one end of the flexible circuit board (27).

6. The battery pack with a double-layer battery cell module according to claim 5, characterized in that: The aluminum bar installation position (701) includes external aluminum bar positions (703) arranged on both sides, and a plurality of positive and negative aluminum bar positions (704) arranged between the two external aluminum bar positions (703); The aluminum bar (8) includes an external aluminum bar (801) corresponding to the external aluminum bar position (703), and positive and negative aluminum bars (802) corresponding to the positive and negative aluminum bar positions (704); The external aluminum bar position (703) is provided with an external aluminum bar embedding groove (705) capable of embedding the external aluminum bar (801), and the external aluminum bar embedding groove (705) is provided with a single-pole through groove (706) capable of sleeve-mounting an electrode of a single battery cell (24); The positive and negative aluminum bar positions (704) are provided with positive and negative aluminum bar embedding grooves (707) for embedding the positive and negative aluminum bars (802), and the positive and negative aluminum bar embedding grooves (707) are provided with positive and negative electrode through grooves (708) for sleeve-mounting the electrodes of the two battery cells (24).

7. The battery pack with a double-layer battery cell module according to claim 6, characterized in that: The positive and negative electrode through grooves (708) include a positive electrode through groove (709) and a negative electrode through groove (710) arranged in the positive and negative electrode aluminum bar embedding grooves (707), the positive electrode through groove (709) is used for the positive electrode of a single battery cell (24) to extend therein, and the negative electrode through groove (710) is used for the negative electrode of a single battery cell (24) to extend therein; The positive and negative electrode aluminum bars (802) include a positive electrode connecting portion (803) capable of acting on the positive electrode through groove (709), and a negative electrode connecting portion (804) capable of acting on the negative electrode through groove (710).

8. The battery pack with a double-layer battery cell module according to claim 1, characterized in that: The cell module reversing electrical connection assembly (6) comprises an upper support (601) and a lower support (602) arranged on the inner wall of the rear beam plate (103); an upper copper bar mounting seat module (603) is arranged on the upper support (601), and a lower copper bar mounting seat module (604) is arranged on the lower support (602); a longitudinally arranged series copper bar (605) is arranged between the upper copper bar mounting seat module (603) and the lower copper bar mounting seat module (604); the series copper bar (605) comprises a copper bar body (606) and a copper bar upper connection end (607) and a copper bar lower connection end (608) arranged at two ends of the copper bar body (606).

9. The battery pack with a double-layer battery cell module according to claim 1, characterized in that: A protective plate (9) is also provided on the top of the front baffle (4) and the rear beam plate (103), and the protective plate (9) comprises a protective plate body (901) and support plates (902) vertically arranged on both sides of the protective plate body (901), and a right-angle connecting edge (903) folded outward is provided on the bottom side of the support plate (902), and protective plate connecting holes (904) are provided on the right-angle connecting edge (903), the front baffle (4), and the top of the rear beam plate (103), and screw connection is achieved by protective plate screws (905).

10. The battery pack with a double-layer battery cell module according to claim 1, characterized in that: A plurality of sockets (12) are provided on the front beam plate (102), and the inner sides of the sockets (12) are in communication with the high-voltage box module installation cavity (13).

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