CN117293467A - Novel CTB battery pack and vehicle body with same - Google Patents

Novel CTB battery pack and vehicle body with same Download PDF

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Publication number
CN117293467A
CN117293467A CN202311312139.5A CN202311312139A CN117293467A CN 117293467 A CN117293467 A CN 117293467A CN 202311312139 A CN202311312139 A CN 202311312139A CN 117293467 A CN117293467 A CN 117293467A
Authority
CN
China
Prior art keywords
battery
ctb
battery pack
novel
cells
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311312139.5A
Other languages
Chinese (zh)
Inventor
张毅翔
孙雨晴
朱晓怡
覃小攀
朱佳胤
赵传军
冯兆玄
顾超
李凯峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SAIC Volkswagen Automotive Co Ltd
Original Assignee
SAIC Volkswagen Automotive Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SAIC Volkswagen Automotive Co Ltd filed Critical SAIC Volkswagen Automotive Co Ltd
Priority to CN202311312139.5A priority Critical patent/CN117293467A/en
Publication of CN117293467A publication Critical patent/CN117293467A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/70—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by fuel cells
    • B60L50/72—Constructional details of fuel cells specially adapted for electric vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/293—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B60K2001/0405—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion characterised by their position
    • B60K2001/0438—Arrangement under the floor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention provides a novel CTB battery pack, which comprises the following components: the battery module comprises a shell, at least one battery cell stack and an upper cover. The shell is hollow, the upper end of the shell is provided with an opening, and at least one cell stack is arranged in the shell. Each cell stack comprises at least two sub-cell stacks, and two adjacent sub-cell stacks are connected through an intermediate fixing plate. Each sub-cell stack includes two end plates, at least two side plates, and at least two cells. At least two electric cores are stacked along the X direction and connected to form an electric core group, two end plates are respectively arranged at two ends of the electric core group in the X direction, and at least two side plates are respectively arranged at two sides of the electric core group in the Y direction. The size of the upper cover is matched with the size of the opening of the shell, and the upper cover is used for covering the shell. Wherein, X direction is the electric core thickness direction, and Y direction is electric core length direction. The invention realizes high integration, reduces the number of parts and the weight of the battery pack, and improves the grouping efficiency.

Description

Novel CTB battery pack and vehicle body with same
Technical Field
The invention relates to the technical field of automobiles, in particular to a novel CTB battery pack and an automobile body with the same.
Background
In recent years, with the continuous expansion of new energy automobile markets, competition is also more and more intense, and technology and product updating and upgrading are required to be continuously promoted. The development of an integrated mode of a battery and a vehicle body and an assembly mode of a battery core in the battery is an important field of new energy automobile technology iteration at present. The conventional battery configuration is CTM (Cell to Module), i.e., a three-stage assembly mode of "cell-module-battery pack". Although the battery has been reduced in cost and increased in energy density by increasing the size of the module in the past several years, the problem of complicated process and the like caused by the assembly of the module due to ineffective weight of the module remains a difficult problem for the new energy automobile. Thus CTB (Cell to Body) technology has evolved. The CTB integrates the battery and the vehicle body bottom plate, meanwhile, a module is omitted in the battery, and the battery cell is directly integrated into the battery system. The scheme can greatly reduce the number of parts, reduce the cost, improve the battery grouping efficiency, and further improve the battery capacity and the endurance mileage. The CTB technology has many advantages, so that the CTB technology becomes a decisive key technology in a future period of time, and is a research focus of various large related enterprises at home and abroad.
The technical routes of the current mainstream CTB battery pack scheme are as follows:
1. the automobile body bottom plate and the battery package upper shell are combined into a whole, the lower shell of the battery package is assembled with the automobile body through the mounting point, and the automobile body bottom plate and the battery package lower shell are sealed through sealant. The risk of this kind of scheme lies in that it has broken up the assembly method of battery system for the detection of coming off line of battery stirs together with whole car detection, has increased the assembly degree of difficulty of battery. In addition, because the vehicle body structure often has more attach fitting, locating hole, weeping hole etc. these structures and battery integration together can make the battery package realize sealed degree of difficulty and increase.
2. The underbody is integrated with the battery pack upper case, and becomes a part of the battery. The battery is assembled with the vehicle body through the mounting points, sealing strips are arranged between the upper cover of the battery and the doorsill as well as between the upper cover of the battery and the front and the rear cross beams, and the sealing requirements of the passenger cabin are met through the sealing strips. For this solution, there are two more typical technical routes:
(1) The module is omitted, and the cylindrical battery cell is directly paved in the battery lower shell. In order to make the structure more firm, a plastic base is also placed at the bottom of the battery cell to nest the battery cell. In addition, an integral glue filling process is adopted between the battery cells. The method ensures that all the battery cells form a whole and can bear common stress and bear a certain deformation of the vehicle body when in full load; and the battery cell can be restrained so as not to loosen. Its advantages are high battery grouping efficiency and low cost. However, the risk of the technical route is not negligible, the process difficulty is relatively high, and especially the later maintenance difficulty and the cost are higher than those of other CTB schemes. In addition, if the cross member and seat support that provide lateral strength to the underbody are part of the battery pack upper cover assembly rather than being welded to the body, this is detrimental to the improved side impact efficiency of the structure.
(2) The standard cuboid battery cells are directly paved on the bottom plate and glued with the bottom plate, and the battery has various battery cell combination modes. The cell stack is laterally supported by the frame through the end plates. The method is the process route with higher integration level like tesla.
Disclosure of Invention
The invention aims to provide a novel CTB battery pack so as to realize high integration, reduce the number of parts and the weight of the battery pack and improve grouping efficiency.
In order to achieve the above object, the present invention provides a novel CTB battery pack comprising:
a housing which is hollow and has an opening at an upper end;
the battery cell stack comprises at least two sub-battery cell stacks, wherein each sub-battery cell stack comprises at least two sub-battery cell stacks, the two adjacent sub-battery cell stacks are connected through a middle fixing plate, each sub-battery cell stack comprises two end plates, at least two side plates and at least two battery cells, the at least two battery cells are stacked along the X direction and connected into a battery cell group, the two end plates are respectively arranged at two ends of the battery cell group in the X direction, and the at least two side plates are respectively arranged at two sides of the battery cell group in the Y direction;
the size of the upper cover is matched with that of the opening of the shell, and the upper cover covers the shell;
wherein, X direction is the electric core thickness direction, and Y direction is electric core length direction.
In one embodiment, the two sides of the cell group in the Y direction are coated with structural adhesive to connect the cell group and the side plates.
In one embodiment, a soft elastomer is adhered between two adjacent cells.
In one embodiment, the shell comprises a frame, a cross beam and a longitudinal beam, wherein the cross beam and the longitudinal beam are mutually perpendicular and are arranged on the inner side of the frame, the cross beam and the longitudinal beam form four positions in the frame, the novel CTB battery pack comprises four battery cell stacks, and the four battery cell stacks are respectively arranged in the four positions in the frame.
In one embodiment, each cell stack comprises four sub-cell stacks, each sub-cell stack comprises twelve cells stacked along the X direction, and the twelve cells are connected into a cell group in a two-to-six string manner;
the two-six strings are as follows: every two cells in the twelve cells are mutually connected in parallel to form six groups of cells, and then the six groups of cells are connected in series.
In one embodiment, each sub-cell stack further comprises a high-voltage bus bar, the high-voltage bus bar is arranged on one side of the cell group in the Y direction, the cells are connected into the cell group through the high-voltage bus bar, and every four cells are connected with one high-voltage bus bar.
In one embodiment, an insulating plate is disposed between the cell stack and the housing.
In one embodiment, the distance between the upper cover and the cell stack is greater than 8mm.
In one embodiment, a resilient member is disposed between the upper cover and the cell stack.
In order to achieve the above object, the present invention also provides a vehicle body having the novel CTB battery pack as set forth in any one of claims 1 to 8, the lower body of the vehicle body comprising: the novel CTB battery pack comprises a cross beam and a plurality of seat supports, wherein the two ends of the cross beam are connected with the inner side wall of a vehicle body, the seat supports are arranged along the length direction of the vehicle and are connected with the cross beam, and an upper cover in the novel CTB battery pack is arranged at the bottom of the cross beam.
In one embodiment, a threaded connection point is provided between the upper cover and the cross beam.
In one embodiment, a sealing strip is arranged between the upper cover and the vehicle body.
Drawings
Fig. 1 is a schematic structural view of a novel CTB battery pack according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the connection between the battery cell stack and the housing according to an embodiment of the invention;
FIG. 3 is a schematic diagram of the end and side of a cell stack according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing a specific structure of a sub-cell stack according to an embodiment of the present invention;
FIG. 5 is a schematic view showing an installation position of an insulating plate according to an embodiment of the present invention;
FIG. 6 is a schematic view of an installation position of an elastic member according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the integration of a novel CTB battery pack with a vehicle body according to an embodiment of the present invention;
FIG. 8 is a schematic view of a vehicle body according to an embodiment of the present invention;
FIG. 9 is a schematic view showing the fixation of a novel CTB battery pack to a vehicle body according to an embodiment of the present invention;
fig. 10 is a schematic diagram illustrating sealing between a novel CTB battery pack and a vehicle body according to an embodiment of the present invention.
Reference numerals
1. Novel CTB battery packs; 11. a housing; 12. stacking the battery cells; 120. stacking sub-cells; 1201. a middle fixing plate; 1202. an end plate; 1203. a side plate; 1204. a battery cell; 1205. high-pressure bus; 1206. a long bolt; 13. an upper cover; 14. an elastic member; 15. an insulating plate; 16. a soft elastomer for back adhesive; 2. a vehicle body; A. the upper cover is fixed with the vehicle body; B. battery pack-body main seal face.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, the present invention provides a novel CTB battery pack 1 comprising: a housing 11, at least one cell stack 12 and an upper cover 13. The housing 11 is hollow and has an opening at an upper end, and at least one cell stack 12 is disposed in the housing 11. Each cell stack 12 comprises at least two sub-cell stacks 120, adjacent two sub-cell stacks 120 being connected by an intermediate fixing plate 1201. Each sub-cell stack 120 includes two end plates 1202, at least two side plates 1203, and at least two cells 1204. At least two battery cells 1204 are stacked along the X direction and connected to form a battery cell group, two end plates 1202 are respectively disposed at two ends of the battery cell group in the X direction, and at least two side plates 1203 are respectively disposed at two sides of the battery cell group in the Y direction. The size of the upper cover 13 matches the size of the opening of the housing 11, and the upper cover 13 is used to cover the housing 11. Wherein, X direction is the electric core thickness direction, and Y direction is electric core length direction. In this embodiment, in the X direction, each sub-stack of cells is clamped together by two end plates and an intermediate fixing plate, and these structural members mainly serve to clamp the cells and to carry the stack of cells. The end plates are provided with threaded holes, and each sub-cell stack is clamped by 8 long bolts 1206 penetrating through the holes, and each bolt is screwed on the middle fixing plate, see fig. 3. The end plate and the middle fixing plate can be made of aluminum materials or plastic materials. In this embodiment, each sub-cell stack includes four side plates 1203 respectively disposed at the upper and lower ends of the two sides of the cell group in the Y direction.
Further, since the thickness direction of the battery cell changes during rapid charge and discharge, the back-adhesive soft elastomer 16 is stuck between the battery cell and the battery cell, so that the back-adhesive soft elastomer can serve as a heat insulation pad to prevent heat transfer on one hand, and can serve as a buffer body to accommodate the change of the thickness of the battery cell on the other hand.
Further, the two sides of the battery cell group in the Y direction are coated with structural adhesive so as to connect the battery cell group and the side plates. The battery cell group is connected with the side plate through the structural adhesive so as to realize the fixation in the Y direction.
Further, the housing 11 includes a frame, and transverse beams perpendicular to each other and disposed inside the frame, the transverse beams forming four positions inside the frame. In this embodiment, the new CTB battery pack 1 includes four cell stacks 12, and the four cell stacks 12 are respectively disposed in four positions in the frame. In this embodiment, the frame is preferably an aluminum extrusion, and the transverse and longitudinal beams are aluminum alloy structural members.
Still further, each of the cell stacks 12 includes four sub-cell stacks 120, each sub-cell stack 120 includes twelve cells 1204 stacked along the X-direction, and the twelve cells 1204 are connected in two-to-six strings to form a cell group, and each four cell groups forms one sub-cell stack 120 in a 2×2 arrangement, see fig. 2. The two-six strings are as follows: every two cells in the twelve cells are mutually connected in parallel to form six groups of cells, and then the six groups of cells are connected in series. In this embodiment, each cell stack 12 is preferably connected to the housing by 6 bolts, see fig. 2.
Still further, the subcell stack 120 also includes a high voltage bus 1205. The bus bar is a multi-layer composite structure connection row. The bus bar connects the cells by welding or bolting. The high voltage bus 1205 is disposed on one side of the cell stack in the Y direction, see fig. 4. The cells 1204 are connected into a cell group by high voltage bus 1205, with each four cells 1204 being connected to one high voltage bus 1205. In order to achieve the purpose of two-to-six strings, twelve electric cores 1204 are connected with four electric cores 1204 by a high-voltage bus 1205, and the logic is that two electric cores 1204 are firstly connected in parallel as a group, then the two groups are connected in series, and the small units are continuously connected in series, so that a sub-electric core stack of a basic unit is finally formed. In this embodiment, the high voltage bus 1205 and the cell 1204 are preferably laser welded in-line.
Still further, since the cell terminal Y is directed outward and is connected with the high voltage bus 1205, an insulating plate 15 is provided between the cell stack 12 and the housing 11, and insulating treatment is performed on the cell to realize an electrical safety function, see fig. 5.
Further, considering the influence of the upper cover 13 as a vehicle body floor on the module/cell, the distance between the upper cover 13 and the cell stack 12 is greater than 8mm.
Further, an elastic member 14 is disposed between the upper cover 13 and the cell stack 12 to support the upper cover 13, see fig. 6.
As shown in fig. 7, the present invention also provides a vehicle body 2, the vehicle body 2 having the novel CTB battery pack 1 as described above. As shown in fig. 8, the lower vehicle body of the vehicle body 2 includes: the vehicle seat comprises a cross beam and a plurality of seat brackets, wherein the two ends of the cross beam are connected with the inner side wall of the vehicle body, and the plurality of seat brackets are arranged along the length direction of the vehicle and are connected with the cross beam. The upper cover 13 in the novel CTB battery pack 1 is provided at the bottom of the cross member. In this embodiment, the upper cover 13 is lifted to the original floor height, the upper cover 13 replaces the floor in the conventional vehicle body, and the cross beam and the seat support, which play a main role in the side of the vehicle body and the column bump, remain on the lower vehicle body.
Further, in order to increase the rigidity of the upper cover 13, a screw connection point a is provided between the upper cover 13 and the cross member, see fig. 9.
Further, since the battery pack is assembled to the vehicle body 2 with a gap naturally provided between the battery pack and the vehicle body 2, in order to secure the sealability inside the vehicle body 2, it is necessary to make a sealing structure (battery pack-vehicle body main sealing surface at B) on the vehicle body 2 and to provide a weather strip between the upper cover 13 and the vehicle body 2, see fig. 10. In this embodiment, a weather strip is preferably provided between the upper cover 13 and the vehicle body. Since such a weather strip is sandwiched between the vehicle body and the battery, these are parts which are large in number of processes and mass, and therefore there is a high requirement for the performance of the weather strip for robustness. In this embodiment, the sealing strip is preferably a PUR sealing strip. The basic performance requirements of the sealing strip employed in this embodiment are as follows:
hardness (Shore a): 40-60;
tensile strength: 250-400 KPa;
compressive strength: 50-125 KPa;
elongation at break: more than or equal to 150 percent;
permanent set at normal temperature: more than or equal to 85 percent;
operating temperature: -40-90 ℃.
The novel CTB battery pack has the following beneficial effects:
aiming at the CTB battery chassis integration technology, the novel CTB battery pack adopts a technical route of canceling the vehicle body floor, and the upper shell of the battery pack is used for replacing the vehicle body floor, so that the integration of the battery and the vehicle body is realized. A circle of PUR sealing strips are arranged on a flat contact surface formed by the upper shell of the battery pack and the vehicle body, so that the passenger cabin is sealed. By these measures, the sealing of the battery pack and the vehicle body and the safety and performance requirements of the battery pack and the vehicle body are ensured. In the battery pack, the invention cancels the module structure, and the battery cells are directly arranged in groups to form a battery cell stack. The invention has high integration, reduces the number of parts and the weight of the battery pack, improves the grouping efficiency, and enables more battery cells to be accommodated in a limited space. The invention realizes the integration of the CTB body and the battery structure, and ensures that the power storage battery meets the requirements of high integration, low cost and high battery capacity. The invention is a technical scheme which is very in line with the current battery development trend.
It should be noted that, unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "disposed," "configured," and the like as used in the description of the present application should be construed broadly, and the connection may be, for example, a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements, and the specific meaning of the two elements can be understood by a person skilled in the art according to specific situations.
The above embodiments are merely further illustrative of the present invention and are not intended to limit the present invention in any way, and various other embodiments are possible. Various modifications and variations may be made by those skilled in the art in light of the present disclosure without departing from the spirit and scope of the present disclosure, and such modifications and variations are intended to fall within the scope of the present disclosure.

Claims (12)

1. A novel CTB battery pack, comprising:
a housing which is hollow and has an opening at an upper end;
the battery cell stack comprises at least two sub-battery cell stacks, wherein each sub-battery cell stack comprises at least two sub-battery cell stacks, the two adjacent sub-battery cell stacks are connected through a middle fixing plate, each sub-battery cell stack comprises two end plates, at least two side plates and at least two battery cells, the at least two battery cells are stacked along the X direction and connected into a battery cell group, the two end plates are respectively arranged at two ends of the battery cell group in the X direction, and the at least two side plates are respectively arranged at two sides of the battery cell group in the Y direction;
the size of the upper cover is matched with that of the opening of the shell, and the upper cover covers the shell;
wherein, X direction is the electric core thickness direction, and Y direction is electric core length direction.
2. The novel CTB battery pack according to claim 1, wherein both sides of the cell group in the Y direction are coated with structural adhesive to connect the cell group and the side plates.
3. The novel CTB battery pack as recited in claim 1, wherein a soft elastomer is attached between two adjacent cells.
4. The novel CTB battery pack according to claim 1, wherein the housing comprises a frame, and a transverse longitudinal beam, the transverse longitudinal beams are perpendicular to each other and are arranged on the inner side of the frame, the transverse longitudinal beam forms four positions in the frame, the novel CTB battery pack comprises four cell stacks, and the four cell stacks are respectively arranged in the four positions in the frame.
5. The novel CTB battery pack according to claim 4, wherein each cell stack comprises four sub-cell stacks, each sub-cell stack comprises twelve cells stacked in the X-direction, the twelve cells being connected in a two-to-six string fashion to form a cell group;
the two-six strings are as follows: every two cells in the twelve cells are mutually connected in parallel to form six groups of cells, and then the six groups of cells are connected in series.
6. The novel CTB battery pack according to claim 5, wherein each sub-cell stack further comprises a high voltage bus bar disposed at one side of the cell group in the Y direction, the cells are connected into the cell group by the high voltage bus bar, and every four cells are connected with one high voltage bus bar.
7. The novel CTB battery pack as recited in claim 6, wherein an insulating plate is disposed between the cell stack and the housing.
8. The novel CTB battery pack of claim 1, wherein the distance between the upper lid and the cell stack is greater than 8mm.
9. The new CTB battery pack as recited in claim 1, wherein a resilient member is disposed between the upper cover and the cell stack.
10. A vehicle body having the novel CTB battery pack of any one of claims 1-8, the lower body of the vehicle body comprising: the novel CTB battery pack comprises a cross beam and a plurality of seat supports, wherein the two ends of the cross beam are connected with the inner side wall of a vehicle body, the seat supports are arranged along the length direction of the vehicle and are connected with the cross beam, and an upper cover in the novel CTB battery pack is arranged at the bottom of the cross beam.
11. The vehicle body of claim 10, wherein a threaded connection point is provided between the upper cover and the cross member.
12. The vehicle body of claim 11, wherein a weather strip is disposed between the upper cover and the vehicle body.
CN202311312139.5A 2023-10-11 2023-10-11 Novel CTB battery pack and vehicle body with same Pending CN117293467A (en)

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CN202311312139.5A CN117293467A (en) 2023-10-11 2023-10-11 Novel CTB battery pack and vehicle body with same

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