Battery assembly, vehicle, battery cell design method and electronic device

Abstract

The present invention discloses a battery assembly, a vehicle, a battery cell design method, and an electronic device. The battery assembly includes: a battery cell (10), a hollow structure (11) formed in the middle of the battery cell (10), a first explosion-proof valve (12) provided on at least one side wall of the battery cell (10) surrounding the hollow structure (11), and a second explosion-proof valve (14) provided on the top cover (13) of the battery cell (10); and a cooling pipe (20), the cooling pipe (20) being provided in the hollow structure (11). The present invention solves the technical problem of inconsistent temperature at various locations within the battery cell of a battery assembly in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of battery assemblies, and in particular to a battery assembly, a vehicle, a battery cell design method, and an electronic device. Background Art

[0002] As a key component of new energy vehicles, power batteries require structural safety and thermal management performance. Currently, the mainstream battery assembly solutions are standard modules or CTP configurations. These two solutions are relatively complex and present two major issues: 1. Power batteries are subject to height restrictions in the Z direction, resulting in low integration; 2. Power batteries have poor thermal management performance, making it impossible to ensure temperature consistency between and within battery cells.

[0003] Currently, no effective solution has been proposed to the problem of inconsistent temperatures at various locations within the battery cells of a battery assembly in the prior art. Summary of the Invention

[0004] Embodiments of the present invention provide a battery assembly, a vehicle, a battery cell design method, and an electronic device to at least solve the technical problem of inconsistent temperatures at various locations within a battery cell of a battery assembly in the prior art.

[0005] To achieve the above-mentioned objective, according to one aspect of the present invention, a battery assembly is provided, comprising: a battery cell, a hollow structure being formed in the middle of the battery cell, a first explosion-proof valve being provided on at least one side wall of the battery cell enclosing the hollow structure, and a second explosion-proof valve being provided on the top cover of the battery cell; and a cooling pipe, the cooling pipe being provided in the hollow structure.

[0006] Furthermore, the hollow structure is a through hole that penetrates the thickness direction of the battery cell. There are multiple battery cells, and the multiple battery cells are arranged side by side along the thickness direction of the battery cell, so that each hollow structure forms a cooling channel, and the cooling pipe is arranged in the cooling channel.

[0007] Furthermore, multiple battery cells are arranged side by side along the thickness direction of the battery cells to form at least one battery cell group, and the battery cell group has a cooling channel. The battery assembly also includes: an installation frame; a box body, the box body is connected to the installation frame, and the inner circumference of the box body and the installation frame is arranged to form an accommodating space, and the battery cell group is located in the accommodating space.

[0008] Furthermore, there are multiple battery cell groups, which are spaced apart along the length direction of the box body. Each battery cell group has a cooling channel, and each battery cell group is correspondingly provided with a cooling pipe passing through the cooling channel.

[0009] Furthermore, an annular cavity is provided inside the mounting frame, the annular cavity is connected to multiple cooling pipes, the annular cavity and the multiple cooling pipes form a sealed flow channel, the sealed flow channel is used to transport coolant, and a cooling pipe joint connected to the annular cavity is provided on one side of the mounting frame.

[0010] Furthermore, the explosion-proof pressure of the first explosion-proof valve is P1, and the explosion-proof pressure of the second explosion-proof valve is P2, wherein P1<0.5*P2.

[0011] Furthermore, the geometric center line of the cooling tube is arranged to coincide with the geometric center line of the battery cell.

[0012] According to one aspect of the present invention, a vehicle is provided, comprising a battery assembly, wherein the battery assembly is the battery assembly described above.

[0013] According to another aspect of the present invention, a battery cell design method is provided, the method comprising: obtaining capacity CM and size GC, wherein capacity CM is the minimum target capacity that the battery cell needs to meet, and size GC is the size limit value allowed by the production process of the battery cell; determining area S based on capacity CM and size GC, wherein area S is the projected area of ​​the hollow structure on the plane where the maximum side wall of the battery cell is located, and area S is calculated by the following formula: S=CM*CC*GC*sinA, A is a preset size compensation parameter, and CC is a preset capacity-related area coefficient; determining length B of the hollow structure based on area S, wherein length B is calculated by the following formula: B=S / (GB*E), GB is a preset size threshold, the size threshold is the length limit value allowed by the production process of the battery cell, and E is a preset safety size coefficient; determining width D based on area S and length B, wherein width D is calculated by the following formula: D=S / B*cosV, and V is a preset width compensation parameter.

[0014] According to another aspect of the present invention, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the method described above through the computer program.

[0015] By applying the technical solution of the present invention, a cooling pipe is installed in the battery cell through a hollow structure, so that the cooling pipe can effectively cool the inside of the battery cell, achieving temperature consistency throughout the battery cell without the need for a liquid cooling plate, reducing the axial height of the battery assembly and improving the degree of integration of the battery assembly. A first explosion-proof valve is provided on the bottom side of the hollow structure, and a second explosion-proof valve is provided on the top cover of the battery cell, which can achieve a two-level safety delay of thermal runaway of the battery cell. The technical solution of the present application effectively solves the technical problem of inconsistent temperature throughout the battery cell of the battery assembly in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 is a schematic structural diagram of a battery assembly according to one optional embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of a battery assembly according to one optional embodiment of the present invention;

[0019] Figure 3 is a schematic structural diagram of a battery assembly according to one optional embodiment of the present invention;

[0020] Figure 4 is a schematic structural diagram of a battery assembly according to one optional embodiment of the present invention;

[0021] Figure 5 1 is a hardware structure block diagram of a computer terminal according to a battery cell design method according to one optional embodiment of the present invention;

[0022] Figure 6 is a flow chart of a battery cell design method according to one optional embodiment of the present invention.

[0023] The above drawings include the following reference numerals:

[0024] 10. Battery cell; 11. Hollow structure; 12. First explosion-proof valve; 13. Top cover; 14. Second explosion-proof valve;

[0025] 20. Cooling pipe;

[0026] 30. Battery cell group;

[0027] 40. Install the frame; 41. Cooling pipe joint;

[0028] 50. Box;

[0029] 60. Positive electrode; 61. Negative electrode. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Combine Figures 1 to 4 As shown, according to a specific embodiment of the present application, a battery assembly is provided.

[0033] The battery assembly includes a battery cell 10 and a cooling tube 20. A hollow structure 11 is formed in the center of the battery cell 10. A first explosion-proof valve 12 is installed on at least one sidewall of the battery cell 10 that encloses the hollow structure 11. A second explosion-proof valve 14 is installed on the top cover 13 of the battery cell 10. The explosion-proof pressure of the first explosion-proof valve 12 is lower than that of the second explosion-proof valve 14. The cooling tube 20 is installed within the hollow structure 11.

[0034] By applying the technical solution of this embodiment, a cooling pipe is installed in the hollow structure 11 of the battery cell 10, so that the cooling pipe 20 can effectively cool the inside of the battery cell, achieving temperature consistency throughout the battery cell, without the need for a liquid cooling plate, reducing the axial height of the battery assembly, and improving the degree of integration of the battery assembly. A first explosion-proof valve 12 is provided on the bottom side of the hollow structure 11, and a second explosion-proof valve 14 is provided on the top cover 13 of the battery cell 10, which can achieve a two-stage safety delay of thermal runaway of the battery cell. The technical solution of this application effectively solves the technical problem of inconsistent temperature in various parts of the battery cell of the battery assembly in the prior art.

[0035] In an optional embodiment, the battery cell 10 is a wound square battery cell.

[0036] like Figure 1 As shown, the battery cell 10 further includes a negative electrode 61 and a positive electrode 60, with a second explosion-proof valve 14 disposed between the negative electrode 61 and the positive electrode 60. Preferably, the first explosion-proof valve 12 of the battery cell 10 is disposed on the bottom sidewall of the hollow structure 11 enclosed within the battery cell 10, that is, on the bottom side of the hollow structure 11. The technical solution of this embodiment can achieve highly integrated battery assemblies, improve the thermal management performance and consistency of the battery liquid cooling plate, and thereby extend the service life of the battery assembly.

[0037] like Figure 2As shown, the hollow structure 11 is a through-hole penetrating the thickness direction of the battery cell 10. There are multiple battery cells 10. The multiple battery cells 10 are arranged side by side in the thickness direction of the battery cell 10, so that each hollow structure 11 forms a cooling channel, and the cooling pipe 20 is arranged in the cooling channel. This setting enables the cooling pipe 20 to cool multiple battery cells 10 simultaneously, improving the cooling efficiency of the battery assembly and also contributing to improving the temperature consistency of each battery cell.

[0038] Optionally, the structure of the cooling pipe 20 includes but is not limited to large heat transfer surface structures such as a "field" shaped profile structure; the processing technology of the cooling pipe 20 includes but is not limited to rapid prototyping processes such as extrusion profiles. The outer wall surface of the cooling pipe 20 is closely attached to the inner wall of the hollow structure 11. This setting can increase the heat transfer area between the coolant and the cooling pipe 20, and between the cooling pipe 20 and the hollow structure 11, thereby enhancing the thermal management performance of the battery assembly. The cooling pipe 20 is arranged in the middle of the battery cell 10, which can effectively reduce the inconsistency of the thermal performance inside the battery cell, and at the same time play a firm supporting role for the battery cell 10. The cooling pipe 20 functions to fix and support the battery cell l0. The cooling pipe 20 integrates the thermal management function and the function of fixing and supporting the battery cell, enhancing the overall integration level of the battery assembly.

[0039] As Figure 3 shown, multiple battery cells 10 are arranged side by side in the thickness direction of the battery cell 10 to form at least one battery cell group 30. The battery cell group 30 has a cooling channel. The battery assembly further includes a mounting frame 40 and a box body 50. The box body 50 is connected to the mounting frame 40, and the inner peripheral surface of the box body 50 and the mounting frame 40 enclose a containing space, and the battery cell group 30 is located in the containing space. This setting facilitates the maintenance and replacement of the battery cell 10. When repairing or replacing the battery assembly, only the corresponding battery cell group 30 needs to be replaced. At the same time, the cooling channel can ensure the positioning accuracy and connection strength of the cooling pipe. Optionally, the box body 50 is a thin plate metal structure, which functions to seal the battery assembly. Further, there are multiple battery cell groups 30. The multiple battery cell groups 30 are arranged at intervals along the length direction of the box body 50. Each battery cell group 30 has a cooling channel, and each battery cell group 30 is correspondingly provided with a cooling pipe 20 arranged in the cooling channel. This setting enables the battery assembly to have a high energy storage density while preventing problems such as uneven heat dissipation and collision between battery cells.

[0040] Optionally, an annular cavity is provided inside the mounting frame 40. The annular cavity is connected to multiple cooling pipes 20. The annular cavity and the multiple cooling pipes 20 form a sealed flow path. The sealed flow path is used to convey the coolant. One side of the mounting frame 40 is provided with a cooling pipe joint 41 connected to the annular cavity. Optionally, the cooling pipe joint 41 is arranged at the front end of the box body 50. The cooling pipe 20 passes through the middle of the battery cell 10 and is connected to the mounting frame 40.

[0041] In an optional embodiment, the explosion-proof pressure of the first explosion-proof valve 12 is P1, and the explosion-proof pressure of the second explosion-proof valve 14 is P2, where P1 < 0.5 * P2. The lower portion of the cooling tube 20 is in close contact with the surface of the first explosion-proof valve 12. If the battery cell 10 experiences thermal runaway, it will first break through the first explosion-proof valve 12, then the cooling tube 20, allowing coolant to flow into the battery cell, effectively delaying thermal runaway.

[0042] Furthermore, the geometric centerline of the cooling tube 20 is arranged to coincide with the geometric centerline of the battery cell 10. This arrangement ensures that the cooling effect of the cooling tube 20 on the battery cell 10 is consistent, thereby improving the thermal management consistency of the battery assembly.

[0043] According to a specific embodiment of the present application, a vehicle is provided, including a battery assembly, wherein the battery assembly is the battery assembly in the above embodiment.

[0044] According to one embodiment of the present invention, an embodiment of a battery cell design method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0045] The method embodiment can be executed in an electronic device or similar computing device in a vehicle that includes a memory and a processor. For example, Figure 1 As shown, the electronic device of the vehicle may include one or more processors 102 (the processor may include but is not limited to a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microprocessor (MCU), a field-programmable logic device (FPGA), a neural network processor (NPU), a tensor processing unit (TPU), an artificial intelligence (AI) type processor, etc.) and a memory 104 for storing data. Optionally, the electronic device of the above-mentioned car may also include a transmission device 106 for communication functions, an input and output device 108, and a display device 110. It will be understood by those skilled in the art that Figure 5 The structure shown is for illustration only and does not limit the structure of the electronic device of the vehicle. For example, the electronic device of the vehicle may include more or fewer components than those described above, or have a configuration different from that described above.

[0046] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the battery cell design method in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, realizes the above-mentioned battery cell design method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0047] The transmission device 106 is used to receive or transmit data via a network. A specific example of the aforementioned network may include a wireless network provided by the mobile terminal's communications provider. In one embodiment, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to enable communication with the Internet. In one embodiment, the transmission device may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0048] The display device 110 can be, for example, a touch-screen liquid crystal display (LCD) and a touch display (also referred to as a "touch screen" or "touch display"). The LCD can enable a user to interact with the user interface of the mobile terminal. In some embodiments, the mobile terminal has a graphical user interface (GUI), and the user can interact with the GUI by finger contacts and / or gestures on the touch-sensitive surface. The human-computer interaction functions here optionally include the following interactions: creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving emails, call interfaces, playing digital videos, playing digital music and / or web browsing, etc. The executable instructions for performing the above-mentioned human-computer interaction functions are configured / stored in a computer program product or readable storage medium executable by one or more processors.

[0049] This embodiment provides a method for designing a battery cell for an electronic device operating in the above-mentioned vehicle. Figure 2 is a flow chart of a cell design method according to one embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0050] Step S10, obtaining the capacity CM and the size GC, wherein the capacity CM is the minimum target capacity that the battery cell needs to meet, and the size GC is the size limit value allowed by the production process of the battery cell;

[0051] Step S20, determining an area S based on the capacity CM and the size GC, where the area S is the projected area of ​​the hollow structure on the plane where the largest side wall of the battery cell is located, and the area S is calculated by the following formula: S = CM * CC * GC * sinA, where A is a preset size compensation parameter, and CC is a preset capacity-related area coefficient;

[0052] That is, the limit size area (area S) of the hollow structure is determined based on the capacity CM and the size GC (process limit size). Limit size area S = CM*CC*GC*sin(A), where CC is the capacity-related area coefficient and A is the size compensation parameter, which is generally taken as π / 2>A>π / 3;

[0053] Step S30: determining a length B of the hollow structure based on the area S, wherein the length B is calculated by the following formula: B=S / (GB*E), where GB is a preset size threshold, the size threshold is a length limit allowed by the production process of the battery cell, and E is a preset safety size factor;

[0054] Step S40 , determining the width D based on the area S and the length B, wherein the width D is calculated by the following formula: D=S / B*cosV, where V is a preset width compensation parameter.

[0055] Define length B = S / (GB*E), where GB is the process length limit size and E is the safety dimension factor, generally taking 1.13 to 1.23; define width D = S / B*cos(V), where V is the width dimension compensation parameter, generally taking π / 2>V>π / 3;

[0056] In an optional embodiment, the structural parameters need to be corrected and fed back based on the CAE simulation results, that is, the structural parameters are input into the CAE simulation model to obtain a battery assembly design model, and then it is determined whether the structural parameters meet the preset conditions based on the battery assembly design model.

[0057] Through the above steps, the area is calculated based on the minimum capacity of the battery cell and the size of the battery cell, and the structural parameters of the hollow structure are determined based on the area. This ensures the energy storage density and structural strength of the battery cell while having a maximum cooling area to improve the cooling effect.

[0058] An embodiment of the present invention further provides an electronic device, comprising a memory and a processor, wherein the processor is configured to run a computer program to execute the steps in any one of the above method embodiments.

[0059] Optionally, specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0060] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0061] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0062] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0063] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0064] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0065] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A battery assembly, characterized in that: include: A battery cell (10), wherein a hollow structure (11) is formed in the middle of the battery cell (10), a first explosion-proof valve (12) is provided on at least one side wall of the battery cell (10) surrounding the hollow structure (11), and a second explosion-proof valve (14) is provided on the top cover (13) of the battery cell (10); A cooling pipe (20), the cooling pipe (20) being arranged in the hollow structure (11); The hollow structure (11) is a through hole that penetrates the thickness direction of the battery core (10), and there are multiple battery cores (10). The multiple battery cores (10) are arranged side by side along the thickness direction of the battery core (10), so that each hollow structure (11) forms a cooling channel, and the cooling pipe (20) is arranged in the cooling channel; A plurality of the battery cells (10) are arranged side by side along the thickness direction of the battery cells (10) to form at least one battery cell group (30), the battery cell group (30) having the cooling channel, and the battery assembly further comprising: Install the frame (40); A box body (50), the box body (50) being connected to the mounting frame (40), the inner circumference of the box body (50) and the mounting frame (40) forming a receiving space, the battery cell group (30) being located in the receiving space; An annular cavity is provided inside the mounting frame (40), the annular cavity is communicated with the plurality of cooling pipes (20), the annular cavity and the plurality of cooling pipes (20) form a sealed flow channel, the sealed flow channel is used to transport cooling liquid, and a cooling pipe joint (41) is provided on one side of the mounting frame (40) and is communicated with the annular cavity.

2. The battery assembly according to claim 1, characterized in that: There are a plurality of battery cell groups (30), and the plurality of battery cell groups (30) are arranged at intervals along the length direction of the box (50). Each battery cell group (30) has the cooling channel, and each battery cell group (30) is correspondingly provided with the cooling pipe (20) passing through the cooling channel.

3. The battery assembly according to claim 1, characterized in that: The explosion-proof pressure of the first explosion-proof valve (12) is P1, and the explosion-proof pressure of the second explosion-proof valve (14) is P2, wherein P1<0.5*P2.

4. The battery assembly according to claim 1, characterized in that: The geometric center line of the cooling tube (20) is arranged to coincide with the geometric center line of the battery core (10).

5. A vehicle comprising a battery assembly, characterized in that: The battery assembly is the battery assembly according to any one of claims 1 to 4.

6. A battery cell design method, characterized in that: The method comprises: Obtaining the capacity CM and the size GC, wherein the capacity CM is the minimum target capacity that the battery cell needs to meet, and the size GC is the size limit value allowed by the production process of the battery cell; An area S is determined based on the capacity CM and the size GC, wherein the area S is a projection area of ​​the hollow structure on a plane where the largest side wall of the battery cell is located, and the area S is calculated by the following formula: S=CM*CC*GC*sinA, where A is a preset size compensation parameter and CC is a preset capacity-related area coefficient; Determining a length B of the hollow structure based on the area S, wherein the length B is calculated by the following formula: B=S / (GB*E), where GB is a preset size threshold, the size threshold is a length limit allowed by the production process of the battery cell, and E is a preset safety size factor; The width D is determined based on the area S and the length B, wherein the width D is calculated by the following formula: D=S / B*cosV, where V is a preset width compensation parameter.

7. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to run the computer program to perform the method of claim 6 .

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