CN-122000532-A - Battery pack, vehicle and battery pack assembling process

CN122000532ACN 122000532 ACN122000532 ACN 122000532ACN-122000532-A

Abstract

The invention discloses a battery pack, a vehicle and an assembly process of the battery pack. The battery pack comprises a bottom battery seat, wherein the bottom battery seat comprises a containing structure for providing transverse and vertical force to fix the battery unit. The bottom battery seat comprises a layer of transverse stop structure, a layer of vertical stop structure and an exhaust structure. The transverse stop structure is used for accommodating the battery unit. The vertical stop structure is used to support the weight of the battery cell. The vertical stop structure has lateral channels separating the vertical stop structure into a plurality of discrete island structures, wherein between the discrete island structures the plurality of lateral channels form gaps between the bottom battery seat and the bottom wall. When a thermal event causes the cell to release gas from its bottom, the gas passes through the lateral channels between the discrete islands, into the through holes of the vent structure and moves vertically to the top of the vent structure.

Inventors

LIN YUZHONG
JI YUSHUN
DAI SHANGZHI
LIAO ZIWEN
Zhuang Jinyao
Tu Kaixiang
Tang Zide
HUANG FENGXIANG
WU YIRONG

Assignees

行竞之道股份有限公司

Dates

Publication Date: 20260508
Application Date: 20251104
Priority Date: 20251103

Claims (20)

1. A battery pack, comprising: At least one battery cell assembly comprising: A plurality of battery cells; at least one battery holder limiting the positions of the plurality of battery cells; At least one battery connecting member, which is an electrical conductor and is electrically connected to the electrodes of the plurality of battery cells; a fluid-tight enclosure for restricting movement of a thermal management fluid, said enclosure comprising: A front side wall, a rear side wall, a right side wall, a left side wall, a bottom wall and a top wall integrated into the fluid-tight enclosure and combined together to define a space for accommodating the plurality of battery cells, the at least one battery holder, the at least one battery connecting member and the thermal management liquid; A coolant inlet and a coolant outlet disposed on the right side wall and the left side wall, respectively, wherein the coolant inlet and the coolant outlet are configured as interfaces for thermally managing the input and output of liquid to the thermal management system; At least one high voltage connector mounted on the front side wall for electrically connecting to an electrical device, and Wherein the housing is configured to be integral with the electrical device by welding, adhesive or bolting, and A battery management system includes at least one battery monitoring circuit, and Wherein a battery cell assembly is monitored by a battery monitoring circuit, and Wherein an external connection interface of the battery monitoring circuit is assembled with the housing, the external connection interface being configured to connect to a low voltage connector of a downstream signal circuit.
2. The battery pack of claim 1, wherein the housing includes a signal opening structure, and The signal opening structure is a through hole extending from the inner surface of the front side wall to the outer surface of the front side wall, and the through hole provides a channel for accommodating a signal communication interface.
3. The battery pack of claim 2, wherein the through-hole comprises a cylindrical channel structure and a square channel structure; the cylindrical channel structure providing a through hole extending from the inner surface of the front sidewall to the middle portion of the front sidewall; the square channel structure providing a through hole extending from a middle portion of the front side wall to an outer surface of the front side wall, and The through-hole has a circular-edge inner opening facing the cell unit assembly space and a circular-edge outer opening facing the outer space of the cell unit assembly case.
4. The battery pack of claim 1, wherein the battery pack includes a battery holder connection; the battery seat comprises a bottom battery seat; the bottom battery seat is arranged on the surface of the bottom wall of the battery unit component shell, and The bottom battery seat is provided with a protruding part, the battery seat connecting piece is provided with a positioning hole, and the protruding part is inserted into the positioning hole so as to position the battery seat connecting piece on the bottom battery seat.
5. The battery pack of claim 4 wherein the battery holder connection includes a plurality of rail structures, the rail structures defining a transverse passage through which fluid can pass through the gaps between the rail structures.
6. The battery pack of claim 1, wherein the battery holder comprises a bottom battery holder; wherein, the bottom battery holder set up in on the surface of diapire, the bottom battery holder includes a plurality of accommodation structure for provide horizontal and perpendicular power and fix a plurality of battery cells, the bottom battery holder includes: The transverse stop structure is a plane structure with a plurality of accommodating holes, and the accommodating holes penetrate through the upper surface and the lower surface of the bottom battery seat and are used for accommodating the plurality of battery units; A vertical stopper structure disposed at the bottom of the lateral stopper structure and supporting the weight of the plurality of battery cells, the vertical stopper structure having a plurality of lateral passages dividing the vertical stopper structure into a plurality of discrete island structures, wherein among the plurality of discrete island structures, the plurality of lateral passages form a gap between the bottom battery seat and the bottom wall, the plurality of lateral passages being laterally distributed to allow the passage of liquid or gas released from the bottom of the plurality of battery cells, and A plurality of vent structures located above the plurality of lateral passages of the vertical stop structure, the plurality of vent structures including a plurality of through holes extending from a lowermost end of the lateral stop structure to an uppermost end of the plurality of vent structures, thereby allowing a gas or liquid to flow vertically through the plurality of through holes, the plurality of lateral passages being in fluid connection with the plurality of vent structures; wherein when a thermal event causes the cell to release gas from its bottom, the gas enters the through holes of the vent structure and moves vertically to the top end of the vent structure through the plurality of lateral channels between the plurality of discrete island structures.
7. The battery pack of claim 6, wherein the bottom battery holder further comprises a connecting structure and a plurality of vertical fluid channel structures on opposite sides of the bottom battery holder; the plurality of transverse channels being in fluid connection with the plurality of vertical fluid channel structures, and The bottom battery holder is provided with the connecting structure and is used for being connected with other bottom battery holders.
8. The battery pack of claim 1, wherein the vertical stop structure has a smaller horizontal projected area than the bottom battery holder.
9. The battery pack according to claim 8, wherein the battery connection member connects a plurality of battery cells in parallel, forms a plurality of parallel battery cell groups, and connects the plurality of parallel battery cell groups in series.
10. The battery pack of claim 1, wherein the right side wall includes a first interior passage, the first interior passage being a through-hole, a first end of the through-hole being in fluid communication with the coolant inlet port, a second end of the through-hole being in fluid communication with the cell assembly space; the left side wall includes a second interior passage that is a through-hole having a first end in fluid communication with the coolant outlet and a second end in fluid communication with the cell assembly space.
11. The battery pack of claim 10, wherein the right side wall and the left side wall each include at least one channel interface structure as a fluid interface between the internal channel and the cell assembly space; wherein the at least one channel interface structure comprises a plurality of vertical protrusions extending from the inside of the right or left side wall; the space between two adjacent vertical protrusions has a function of a fluid passage for allowing fluid to circulate between the internal passage and the cell unit space.
12. A vehicle, characterized by comprising: A chassis, and A battery system comprising at least one battery pack according to any one of claims 1 to 11, said at least one battery pack being integrated in said chassis.
13. The vehicle of claim 12, wherein the battery system includes at least one battery cell assembly formed from the plurality of battery cells electrically connected by the at least one battery connection member, a battery management system, and a thermal management system.
14. An assembly process of a battery pack, comprising: assembling a plurality of side walls into a shell, wherein the side walls comprise a front side wall, a rear side wall, a right side wall and a left side wall, and a high-voltage connector and a signal interface circuit board are arranged on the front side wall; Installing a cooling liquid inlet and a cooling liquid outlet on the right side wall and the left side wall respectively; placing a bottom battery holder into the housing; Assembling a battery holder connector to the bottom battery holder; assembling two blocking pieces to the right side wall and the left side wall respectively; Assembling a plurality of battery cells to the bottom battery mount in the housing; Connecting a portion of the high voltage connector inside the housing to a contactor inside the housing; Assembling a plurality of connection rods into a plurality of insertion holes of the bottom battery holder, wherein the plurality of connection rods are located between the plurality of battery cells and protrude from above the plurality of battery cells; assembling a top battery holder to the plurality of connecting rods and over the plurality of battery cells; Filling a caulking material in the case to fix the plurality of battery cells; Disposing a plurality of battery connecting members on the top battery mount, and assembling the plurality of battery connecting members to the plurality of battery cells; Sequentially installing two buses into the shell to provide high-voltage electrical connection of the battery pack from inside to outside; installing a battery management system into the housing to provide signal connection of the battery pack from inside to outside; A circuit configuration for mounting a temperature sensor; Mounting a bottom wall to the bottom of the housing, and A top wall is mounted to the top of the housing and a plurality of signal jacks are mounted to the top wall.
15. The battery pack assembly process of claim 14, wherein: Placing a plurality of positioning members for fixing the bottom battery holder at corners of the housing before the bottom battery holder is placed in the housing, and After the bottom battery seat is placed in the shell, corners of the bottom battery seat are abutted against the positioning pieces.
16. The battery pack assembly process of claim 14, wherein the bottom battery holder has a protrusion, the battery holder connector has a positioning hole, and the protrusion is inserted into the positioning hole to position the battery holder connector on the bottom battery holder.
17. The battery pack assembly process of claim 14, wherein the bottom battery holder includes a layer of lateral stop structure and a layer of vertical stop structure, the lateral stop structure having a plurality of receiving holes, the plurality of battery cells being received in and supported by the plurality of receiving holes of the lateral stop structure such that inner side walls of the plurality of receiving holes limit lateral movement of the plurality of battery cells and the vertical stop structure limits downward vertical movement of the plurality of battery cells.
18. The battery pack assembly process of claim 17, wherein the thickness of the filler material is no greater than the height of the vent structure above the lateral stop structure such that the filler material does not fill a through hole in the vent structure.
19. The battery pack assembly process of claim 14, wherein: a thermocouple is adhered to the bottom of the battery cells prior to assembling the plurality of battery cells to the bottom battery holder.
20. The assembly process of the battery pack of claim 14, wherein the top battery holder has a plurality of assembly holes, the plurality of connecting rods being inserted into the plurality of assembly holes to position the top battery holder over the plurality of battery cells.

Description

Battery pack, vehicle and battery pack assembling process Technical Field The present invention relates to an integration of battery cells to form a device that can both store and release electrical energy. In particular, the invention relates to an apparatus assembled from battery cells, wherein all of the battery cells are immersed in a thermal management liquid during operation. Background Electrical energy has been widely used to drive various modern machines. In the use period of electric energy, for example, in different stages of power generation, distribution, consumption, etc., how to temporarily store electric energy and release it when required is an important and necessary task in the design of electric energy charging and discharging. A rechargeable battery cell is a device that converts electrical energy into chemical energy for storage during charging and reconverts chemical energy into electrical energy during discharging. Depending on the application requirements, the battery units are generally integrated in various ways to meet the electrical performance parameters required by the application. The integration of battery cells, so-called battery cell assembly, is generally regarded as a subsystem of the electrical device. In the context of the present invention, an "electrical device" may be considered as a computing machine having an electrically driven machine, a vehicle with an electric motor as the primary source of power, an electrical energy storage system electrically connected to an electrical grid or power plant, or an information technology device, circuit board and/or integrated circuit element for performing computing or information processing functions. Therefore, the integration of battery cell assembly and electrical devices is also an important issue. Furthermore, it is known that the integration of battery cells involves the introduction of thermal management systems and battery management systems in addition to electrical performance parameters. In summary, how to achieve the optimal integration of the battery cells is a major challenge to be solved. Disclosure of Invention 1. Problems to be solved Optimization of battery cell integration requires simultaneous consideration of various requirements for heat dissipation management, electrical interfaces, mechanism stacking, manufacturability, and the like. In submerged systems, a thermal management liquid is used to directly contact the cells while restricting their flow so that the modules can be stacked and sealed in a fluid-tight battery pack enclosure. A coolant inlet and a coolant outlet may be mounted on at least one side wall of the housing as an interface for inputting and outputting thermal management fluid to the thermal management system. The battery cell assembly may include a battery monitoring circuit, a temperature sensor, and a voltage sensor to enhance battery management functions. The battery cell assembly includes a bottom battery mount securely disposed on the bottom wall of the housing. The bottom battery holder includes a receiving structure for providing lateral and vertical forces to secure the battery cells. The bottom battery seat can be a rectangular plate and comprises a layer of transverse stop structure, a layer of vertical stop structure and a plurality of exhaust structures. The battery cells may be positioned on the bottom battery holder by a lateral stop structure and a vertical stop structure. The vent structure may include a through hole, and the through hole extends from a lowermost end of the lateral stop structure to an uppermost end of the vent structure, thereby allowing gas or liquid to flow vertically through the through hole. The bottom battery holder may have connection structures for connecting to other bottom battery holders. 2. Technical effects Submerged cooling maintains the cells within a predetermined temperature range and reduces the risk of combustion. The receiving structure of the bottom battery holder can provide lateral and vertical forces to secure the battery cells. The battery cells may be positioned on the bottom battery holder by a lateral stop structure and a vertical stop structure. The inner side walls of the receiving holes restrict lateral movement of the battery cells. The vertical stopper structure protrudes inward in the radial direction of the receiving hole to support the battery cell such that the vertical stopper structure restricts downward vertical movement of the battery cell. The through holes of the vent structure allow the vertical passage of gas or liquid. The vertical stopper structure may have a plurality of lateral passages that divide the vertical stopper structure into a plurality of discrete island structures, and the discrete island structures form laterally distributed passages therebetween to allow the passage of liquid or gas released from the bottom of the battery cell. 3. Coverage of dependency and problem areas System architecture