Battery cell, battery pack, and vehicle

Abstract

The application discloses a battery cell, a battery pack and a vehicle, the battery cell comprising: a small cell unit, an insulation layer, a cell shell and a flexible circuit board; the battery cell has a plurality of small cell units; the insulation layer is arranged between adjacent small cell units; the flexible circuit board is used for collecting the temperature and voltage between adjacent small cell units; the battery cell is arranged in the cell shell; two high-voltage connectors are arranged on the cell shell and can be quickly connected with high-voltage interfaces in a battery box body; two adjacent small cell units are connected in series with the high-voltage connectors arranged on the cell shell; and the high-voltage connectors are connected with a high-voltage box through high-voltage lines in a box longitudinal beam; the small cell units are connected in series in the cell, signal collection and protection functions are realized; the battery pack is integrated with an electric vehicle frame, and weight reduction is further realized to improve energy density.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle power battery, in particular to a battery cell, a battery pack and a vehicle. BACKGROUND

[0002] With the increasingly serious global energy crisis and environmental pollution problems, electric vehicles are developing rapidly. Electric vehicles use electricity as a power source and replace oil-fired engines with electric motors, which can save a large amount of fossil fuels. With the rapid development of electric vehicles, the performance requirements of power batteries are also becoming higher and higher, and increasing energy density is the common goal pursued by various host manufacturers and battery suppliers.

[0003] In the existing battery pack technical solution, the battery cell is connected in series externally to improve the voltage matching of external load components, so that many electrical connection components and protection components are added inside the battery pack, which not only increases the operation difficulty of the connection process, but also is difficult to improve the energy density, and increases the product cost and reduces the cruising range. The above problems need to be solved. SUMMARY

[0004] The purpose of the present application is to provide a battery cell, a battery pack and a vehicle to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical solution: a battery cell comprising:

[0006] Small cell units, the battery cell has a plurality of small cell units;

[0007] An insulating layer, the insulating layer is made of insulating material, and the insulating layer is arranged between adjacent small cell units;

[0008] A flexible circuit board for collecting temperature and voltage between adjacent small cell units;

[0009] A cell shell having a containing space, the battery cell is arranged in the containing space; two high-voltage connectors are arranged on the cell shell;

[0010] Each of the small cell units is provided with a first pole and a second pole, and two adjacent small cell units are connected in series; wherein the first pole of the first small cell unit in the plurality of small cell units forms a first total pole of the battery cell, and the second pole of the last small cell unit in the plurality of small cell units forms a second total pole of the battery cell, the first total pole is connected with one of the high-voltage connectors, and the second total pole is connected with another high-voltage connector.

[0011] Further comprising:

[0012] a plurality of upper tabs, the upper tabs having a first end and a second end;

[0013] a plurality of lower tabs, the lower tabs having a third end and a fourth end;

[0014] a plurality of connecting tabs, the connecting tabs being formed by connecting the second ends of the upper tabs and the fourth ends of the lower tabs to form a Y-shaped structure;

[0015] the connecting tabs are arranged between two adjacent layers of the small battery cell units, the first ends of the upper tabs are connected to the positive electrodes of the upper layer of the small battery cell units, and the third ends of the lower tabs are connected to the negative electrodes of the lower layer of the small battery cell units.

[0016] Further, a separator is further included, the separator being made of an insulating material, and the separator spacing the adjacent connecting tabs.

[0017] Further, a flexible circuit board is further included, the flexible circuit board being provided with a plurality of circuit board grooves, the connecting ends of the tabs being inserted into the circuit board grooves, the flexible circuit board having a plurality of collection circuits, and the plurality of collection circuits being respectively connected to the corresponding connecting tabs for collecting temperature and voltage; and the flexible circuit board being fixed on the separator.

[0018] Further, an aluminum plastic film is further included, the aluminum plastic film covering the small battery cell units, the flexible circuit board, and the separator.

[0019] On the other hand, a battery pack is provided, which adopts the battery cell according to any one of the above, and includes:

[0020] a box body, the box body having a partition beam, a cross beam, a longitudinal beam, and a receiving cavity, the partition beam separating the receiving cavity into a first receiving cavity and a second receiving cavity, the cross beam and the longitudinal beam being cross-connected to separate the second receiving cavity into a plurality of battery cell receiving areas, and the two side inner walls connected to the longitudinal beam being respectively provided with a convex groove, and the two convex grooves being spaced apart;

[0021] a battery pack, the battery pack being arranged in the second receiving cavity, the battery pack including a plurality of battery cells, the battery cells being arranged in the battery cell receiving areas, and the battery cells being provided with a groove, and the groove being correspondingly arranged with the convex groove;

[0022] a high-pressure box, the high-pressure box being arranged in the first receiving cavity;

[0023] The longitudinal beam is a hollow structure, the cavity of the longitudinal beam is communicated with the first accommodating cavity, a plurality of high-voltage interfaces are arranged on the side wall of the longitudinal beam, the high-voltage interfaces are respectively connected with the corresponding high-voltage connectors, a plurality of high-voltage lines are arranged in the cavity of the longitudinal beam, the high-voltage lines are respectively connected with the high-voltage interfaces, the plurality of battery cells are connected in series and connected with the high-voltage box, so that the high-voltage current of the battery cell is transmitted to the high-voltage box through the high-voltage line.

[0024] Further comprising:

[0025] A controller is arranged on the battery cell, and a low-voltage signal of voltage and temperature is transmitted from the battery cell to the controller;

[0026] A low-voltage line is arranged in the cavity of the longitudinal beam and connected with the high-voltage box through the partition beam;

[0027] A low-voltage interface is arranged on the longitudinal beam, one end of the low-voltage interface is connected with the controller, and the other end of the low-voltage interface is connected with the low-voltage line, for transmitting the low-voltage signal from the longitudinal beam to the high-voltage box.

[0028] Further, the high-voltage box and the battery pack are fixed to the bottom of the accommodating cavity by adhesive; the longitudinal beam is provided with an elastic buffer pad.

[0029] Further, the cell shell or the cross beam has a local protrusion to reduce the friction force of the battery cell sliding in.

[0030] In another aspect, a vehicle is provided, which adopts the battery pack according to any one of the above, comprising a frame, and the box of the battery pack is integrated on the frame.

[0031] Compared with the prior art, the beneficial effects of the present application are that the small cell units are connected by high polymer welding or other physical connection methods, the end of the tab is arranged with a partition plate to separate the tabs of adjacent small cell units, insulation protection is realized, external series connection components are saved, and component cost and weight are reduced; the flexible circuit board is designed with a groove inserted between the tabs and connected with the tabs by soldering or other connection methods, the transmission of voltage signals is realized, compared with the existing nickel sheet technical solution, the nickel sheet parts and welding space are cancelled, the space utilization rate is improved, and the component cost and weight are reduced. The cell shell is designed with a slide at both ends, the cell positioning and installation method is simple. The cell is designed with a high-voltage connector, which is directly connected with the connector of the butt joint end of the battery box; the small cell units are connected in series, signal acquisition and protection functions are realized in the cell; the solid-state battery cell is also designed with a high-voltage interface, which can be quickly connected with the high-voltage interface in the battery box; the battery pack is integrated with the electric vehicle frame, and weight reduction is further realized to improve the energy density. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Battery cell explosion structure schematic diagram of the embodiment of the present application;

[0033] Figure 2 Battery cell structure schematic diagram of the embodiment of the present application;

[0034] Figure 3 Battery cell structure schematic diagram of the embodiment of the present application; Figure 2 Flexible circuit board and separator connection enlarged structure schematic diagram in position C;

[0035] Figure 4 Battery cell structure schematic diagram of the embodiment of the present application; Figure 1 First total pole and small cell unit structure connection schematic diagram in position B of the embodiment of the present application;

[0036] Figure 5 Battery cell structure schematic diagram of the embodiment of the present application; Figure 1 Second intermediate and small cell unit structure connection schematic diagram in position A of the embodiment of the present application;

[0037] Figure 6 Upper and lower tab composed connection tab and separator structure schematic diagram of the embodiment of the present application;

[0038] Figure 7 Battery cell, battery pack, frame and vehicle structure schematic diagram of the embodiment of the present application;

[0039] Figure 8 Box structure schematic diagram of the embodiment of the present application;

[0040] Figure 9 High voltage interface, high voltage line, low voltage interface and low voltage line connection schematic diagram in the longitudinal beam of the box of the embodiment of the present application;

[0041] Figure 10 High voltage interface, high voltage line, low voltage interface and low voltage line connection schematic diagram in another longitudinal beam of the embodiment of the present application;

[0042] Figure 11 Convex groove, concave groove and cross beam connection structure schematic diagram of the embodiment of the present application;

[0043] In the figure: 10, box; 20, battery cell; 30, high voltage box; 40, controller; 50, frame; 11, cross beam; 12, longitudinal beam; 13, partition beam; 14, first accommodating cavity; 15, second accommodating cavity; 16, cell accommodating area; 17, convex groove; 21, small cell unit; 22, insulation layer; 23, aluminum plastic film; 24, cell shell; 25, high voltage connector; 26, flexible circuit board; 27, partition plate; 28, connecting tab; 41, low voltage line; 42, low voltage interface; 121, high voltage interface; 122, high voltage line; 211, first total pole; 212, second total pole; 241, groove; 281, upper tab; 282, lower tab. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0045] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] Referring to the accompanying drawings, the application provides a technical solution: a battery cell, comprising: a small cell unit 21, an insulating layer 22, a flexible circuit board 26 and a cell shell 24; the battery cell 20 has a plurality of small cell units 21; the insulating layer 22 is made of insulating material, and the insulating layer 22 is arranged between adjacent small cell units 21; the flexible circuit board 26 is used to collect the temperature and voltage between adjacent small cell units 21; the cell shell 24 has a containing space, and the battery cell 20 is arranged in the containing space; two high-voltage connectors 25 are arranged on the cell shell 24; each small cell unit 21 is provided with a first pole and a second pole, and two adjacent small cell units 21 are connected in series; wherein the first pole of a first small cell unit 21 in the plurality of small cell units 21 forms a first total pole 211 of the battery cell 20, the second pole of a last small cell unit 21 in the plurality of small cell units 21 forms a second total pole 212 of the battery cell 20, the first total pole 211 is connected with one high-voltage connector 25, and the second total pole 212 is connected with another high-voltage connector 25.

[0048] In the above embodiment, the series connection of the small cell units in the cell is realized, the voltage of the whole cell is improved, and compared with the prior art, the voltage is improved, the electrical connection components between the cells are reduced, and the insulation protection components in the battery pack are reduced, thereby reducing the cost and the weight of the battery pack; preferably, the small cell unit 21 is formed by pressing a plurality of pole pieces.

[0049] Optionally, it further comprises a plurality of upper tabs 281 and a plurality of lower tabs 282; the upper tab 281 has a first end and a second end; the lower tab 282 has a third end and a fourth end; the connection tab 28 is formed in a Y-shaped structure by connecting the second end of the upper tab 281 and the fourth end of the lower tab 282; the connection tab 28 is arranged between two adjacent layers of small cell units 21, the first end of the upper tab 281 is connected with the positive pole of the upper small cell unit 21, and the third end of the lower tab 282 is connected with the negative pole of the lower small cell unit 21.

[0050] In the above embodiment, preferably, the small cell unit tabs are connected by high polymer welding or other physical connection methods, and the tab ends are arranged with a partition plate to separate the tabs of adjacent small cell units, thereby achieving insulation protection, saving external series connection electrical connection components, and reducing component cost and weight.

[0051] Optionally, it further comprises a partition plate 27, which is made of insulating material and separates adjacent connection tabs 28.

[0052] Optionally, a flexible circuit board 26 is further included, the flexible circuit board 26 is provided with a plurality of circuit board grooves, the connecting ends of the connecting tabs 28 are inserted into the circuit board grooves, the flexible circuit board 26 has a plurality of collection circuits, the plurality of collection circuits are respectively connected with the corresponding connecting tabs 28, and are used for collecting temperature and voltage; and the flexible circuit board 26 is fixed on the partition plate 27.

[0053] In the above embodiment, the flexible circuit board is designed with grooves inserted between the tabs, and the tabs are connected by soldering or other connection methods to realize the transmission of voltage signals. Compared with the existing nickel sheet technical solution, the nickel sheet parts and welding space are cancelled, the space utilization is improved, and the component cost and weight are reduced.

[0054] Optionally, an aluminum plastic film 23 is further included, the aluminum plastic film 23 covers the small cell unit 21, the flexible circuit board 26 and the partition plate 27.

[0055] Optionally, on the other hand, a battery pack is provided, which adopts any one of the battery cells described above, and includes a box body 10, a battery group and a high-voltage box 30; the box body 10 has a partition beam 13, a cross beam 11, a longitudinal beam 12 and a containing cavity, the partition beam 13 divides the containing cavity into a first containing cavity 14 and a second containing cavity 15, the cross beam 11 and the longitudinal beam 12 are cross-connected to divide the second containing cavity 15 into a plurality of cell containing areas 16, the two side inner walls connected with the longitudinal beam 12 of the cell containing area 16 are respectively provided with a convex groove 17, and the two convex grooves 17 are arranged at intervals; the battery group is arranged in the second containing cavity 15, the battery group includes a plurality of battery cells 20, the battery cells 20 are arranged in the cell containing area 16, the battery cells 20 are provided with a groove 29, and the groove 29 is arranged correspondingly with the convex groove 17; the high-voltage box 30 is arranged in the first containing cavity 14; the longitudinal beam 12 is a hollow structure, the cavity of the longitudinal beam 12 is communicated with the first containing cavity 14, a plurality of high-voltage interfaces 121 are arranged on the side wall of the longitudinal beam 12, the high-voltage interfaces 121 are respectively connected with the corresponding high-voltage connectors 25, a plurality of high-voltage wires 122 are arranged in the cavity of the longitudinal beam 12, the high-voltage wires 122 are respectively connected with the high-voltage interfaces 121, so that the plurality of battery cells 20 are connected in series and connected with the high-voltage box 30, thereby making the high-voltage current of the battery cells 20 transmitted to the high-voltage box 30 through the high-voltage wires 122.

[0056] In the above embodiment, the groove 29 and the convex groove 17 are slide design between the battery cell 20 and the box 10, and the battery cell 20 is slid into the box 10 from the side. The cell shell 24 has a recess structure corresponding to the groove 29, in order to facilitate the battery cell 20 to be loaded and positioned, the entrance of the groove 29 and the convex groove 17 can be designed as a large gap fit, and the tail end of the groove 29 and the convex groove 17 can be designed as a small gap fit. The cell shell 24 or the box beam 11 can be designed as a partial protrusion to reduce the friction of the cell sliding in.

[0057] The longitudinal beam 12 is arranged with a high-voltage interface 121 which is in butt joint with the battery cell 20, and high-voltage current is transmitted from the longitudinal beam to the high-voltage box, which is a simple and convenient installation and high integration design compared with the prior art.

[0058] Preferably, a plurality of battery cells 20 are arranged on the bottom plate of the accommodating cavity and are fixed to the bottom plate by adhesive bonding, which is more convenient to operate and saves the space occupied by bolt fixing compared with the prior art.

[0059] Optionally, it further comprises a controller 40, a low-voltage line 41 and a low-voltage interface 42; the controller 40 is arranged on the battery cell 20, and the battery cell 20 transmits low-voltage signals of voltage and temperature to the controller 40; the low-voltage line 41 is arranged in the cavity of the longitudinal beam 12 and is connected with the high-voltage box 30 through the partition beam; the low-voltage interface 42 is arranged on the longitudinal beam 12, one end of the low-voltage interface 42 is connected with the controller 40, and the other end of the low-voltage interface 42 is connected with the low-voltage line 41, for transmitting the low-voltage signals from the longitudinal beam 12 to the high-voltage box 30.

[0060] In the above embodiment, the longitudinal beam 12 is arranged with a low-voltage interface 42 which is in butt joint with the controller 40, and the low-voltage signals are transmitted from the longitudinal beam 12 to the high-voltage box 30, compared with the prior art, the wire harness is arranged in the longitudinal beam 12, which better protects the low-voltage wire harness and the high-voltage wire harness and improves the assembly speed of the battery pack.

[0061] Optionally, the high-voltage box 30 and the battery pack are fixed to the bottom of the accommodating cavity by adhesive bonding, and the longitudinal beam 12 is provided with an elastic buffer pad 18.

[0062] In the above embodiment, the box 10 is arranged with an elastic buffer pad 18 on the longitudinal beam 12, which plays a limiting and buffering role in the assembly process of the battery cell 20.

[0063] Optionally, the cell shell 24 or the beam 11 has a partial protrusion to reduce the friction of the battery cell 20 sliding in.

[0064] In yet another aspect, there is provided a vehicle employing a battery pack as claimed in any one of the above, comprising a frame 50, the housing 10 of the battery pack being integrated to the frame 50.

[0065] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application will be defined with respect to the appended claims and equivalents thereof, which can include other embodiments.

Claims

1. A battery cell, characterized by, It comprises: Small battery cell units (21), the battery cell (20) has a plurality of small battery cell units (21); An insulating layer (22) is made of insulating material, which is arranged between adjacent small battery cell units (21); A flexible circuit board (26) is used to collect the temperature and voltage between adjacent small battery cell units (21); A battery cell shell (24) has a containing space, and the battery cell (20) is arranged in the containing space; two high-voltage connectors (25) are arranged on the battery cell shell (24); Each small battery cell unit (21) has a first pole and a second pole, and two adjacent small battery cell units (21) are connected in series; wherein the first pole of the first small battery cell unit (21) in the plurality of small battery cell units (21) forms the first total pole (211) of the battery cell (20), and the second pole of the last small battery cell unit (21) in the plurality of small battery cell units (21) forms the second total pole (212) of the battery cell (20), the first total pole (211) is connected with one of the high-voltage connectors (25), and the second total pole (212) is connected with another high-voltage connector (25); A plurality of upper tabs (281) have a first end and a second end; A plurality of lower tabs (282) have a third end and a fourth end; A plurality of connection tabs (28) are connected by the second end of the upper tab (281) and the fourth end of the lower tab (282) to form a Y-shaped structure; The connection tab (28) is arranged between two adjacent layers of small battery cell units (21), the first end of the upper tab (281) is connected with the positive electrode of the upper small battery cell unit (21), and the third end of the lower tab (282) is connected with the negative electrode of the lower small battery cell unit (21).

2. The battery cell of claim 1, wherein, It also comprises a partition plate (27) made of insulating material, which separates adjacent connection tabs (28).

3. The battery cell of claim 2, wherein, It also comprises a flexible circuit board (26) having a plurality of circuit board grooves, the connection end of the connection tab (28) is inserted into the circuit board groove, the flexible circuit board (26) has a plurality of collection lines, and a plurality of the collection lines are respectively connected with the corresponding connection tab (28) by tin soldering, which is used to collect temperature and voltage; The flexible circuit board (26) is fixed on the partition plate (27).

4. The battery cell of claim 2, wherein, It also comprises an aluminum plastic film (23) covering the small battery cell units (21), flexible circuit board (26) and partition plate (27).

5. A battery pack employing a battery cell as claimed in any one of claims 1 to 4, characterized by, It comprises: A box (10) has a partition beam (13) separating a containing cavity into a first containing cavity (14) and a second containing cavity (15), a cross beam (11) and a longitudinal beam (12) cross connecting and separating the second containing cavity (15) into a plurality of battery cell containing areas (16), the two side walls of the battery cell containing areas (16) are respectively provided with a protruding groove (17), and the two protruding grooves (17) are spaced apart; A battery pack is arranged in the second containing cavity (15), the battery pack includes a plurality of battery cells (20) arranged in the battery cell containing areas (16), the battery cells (20) have a recess (29) corresponding to the protruding groove (17); A high-voltage box (30) is arranged in the first containing cavity (14); The longitudinal beam (12) is a hollow structure, the cavity of the longitudinal beam (12) is communicated with the first containing cavity (14), a plurality of high-voltage interfaces (121) are arranged on the side wall of the longitudinal beam (12), the high-voltage interfaces (121) are respectively connected with corresponding high-voltage connectors (25), a plurality of high-voltage wires (122) are arranged in the cavity of the longitudinal beam (12), the high-voltage wires (122) are respectively connected with the high-voltage interfaces (121), so that the plurality of battery cells (20) are connected in series and connected with the high-voltage box (30), so that the high-voltage current of the battery cells (20) is transmitted to the high-voltage box (30) through the high-voltage wires (122).

6. The battery pack of claim 5, wherein, Further comprising: A controller (40) is arranged on the battery cell (20), and a low-voltage signal of voltage and temperature is transmitted from the battery cell (20) to the controller (40); A low-voltage wire (41) is arranged in the cavity of the longitudinal beam (12) and connected with the high-voltage box (30) through the partition beam; A low-voltage interface (42) is arranged on the longitudinal beam (12), one end of the low-voltage interface (42) is connected with the controller (40), and the other end of the low-voltage interface (42) is connected with the low-voltage wire (41), for transmitting the low-voltage signal from the longitudinal beam (12) to the high-voltage box (30).

7. The battery pack of claim 5, wherein, The high-voltage box (30) and the battery pack are fixed to the bottom of the containing cavity by adhesive method, and the longitudinal beam (12) is provided with an elastic buffer pad (18).

8. The battery pack of claim 5, wherein, The battery cell shell (24) or the cross beam (11) has a local protrusion to reduce the friction force of the battery cell (20) sliding in.

9. A vehicle employing a battery pack as claimed in any one of claims 5 to 8, characterised in that, A vehicle frame (50) is included, and the box (10) of the battery pack is integrated on the vehicle frame (50).

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