Battery pack and vehicle

Abstract

The invention discloses a battery pack and a vehicle, and relates to the technical field of power electromagnetism, and the battery pack comprises a box body, a battery cell assembly and a high-voltage connecting assembly. A mounting groove with an opening, an exhaust channel which is positioned at the bottom of the mounting groove and extends along the first direction, and an exhaust explosion-proof valve which is positioned at the side part of the box body and is in butt joint with the exhaust channel are arranged in the box body; the battery cell assembly comprises a plurality of battery cells which are sequentially arranged at the bottom of the mounting groove in the first direction, and an anti-explosion valve of each battery cell is arranged towards the exhaust channel; and the high-voltage connecting assembly is positioned on one side, far away from the exhaust explosion-proof valve, of the box body, is electrically connected with the battery cell assembly and is used for connecting the battery cell assembly with an external circuit. The technical scheme provided by the invention aims to quickly discharge high-pressure gas when the battery pack is in thermal runaway, reduce contact between the high-temperature and high-pressure gas and internal components of the battery pack, and reduce potential safety hazards of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a battery pack and a vehicle. Background Art

[0002] With the rapid development of the electric vehicle industry, battery technology has become a key factor restricting the performance and safety of electric vehicles. Although the development of large-capacity battery packs has improved the endurance of electric vehicles, it has also brought higher safety risks, especially thermal runaway. Thermal runaway may not only cause battery damage, but also cause fire or explosion, seriously threatening the safety of passengers and vehicles.

[0003] Existing battery pack designs are deficient in thermal runaway protection. The complex structure inside the battery pack may hinder the rapid discharge of high-pressure gas generated during thermal runaway, causing gas to accumulate inside the battery pack, increasing safety risks of the battery pack. Summary of the invention

[0004] The main purpose of the present invention is to propose a battery pack and a vehicle, which are designed to quickly discharge high-pressure gas when the battery pack is in thermal runaway, reduce the contact between high-temperature and high-pressure gas and internal components of the battery pack, and reduce the safety hazards of the battery pack.

[0005] To achieve the above object, the battery pack proposed by the present invention includes:

[0006] A box body, the interior of which includes a mounting groove with an opening, an exhaust passage located at the bottom of the mounting groove and extending along the first direction, and an exhaust explosion-proof valve located at a side of the box body and docking with the exhaust passage;

[0007] A battery cell assembly, comprising a plurality of battery cells sequentially arranged at the bottom of the mounting groove along a first direction, wherein the explosion-proof valve of each of the battery cells is arranged toward the exhaust passage;

[0008] The high-voltage connection assembly is located on a side of the box body away from the exhaust explosion-proof valve and is electrically connected to the battery cell assembly for connecting the battery cell assembly with an external circuit.

[0009] In one embodiment, the bottom of the box body is recessed in a direction away from the opening to form the exhaust passage.

[0010] In one embodiment, a plurality of the exhaust channels are provided, and the plurality of the exhaust channels are spaced apart along the second direction. A plurality of the battery cell assemblies are provided corresponding to the battery cell assemblies. A connecting chamber is formed in the side wall of the box body, and the connecting chamber connects the plurality of the exhaust channels and the exhaust explosion-proof valve.

[0011] In one embodiment, the battery pack further comprises a detection device, and the detection device is intermittently disposed in the installation groove in a first direction relative to the battery cell assembly.

[0012] In one embodiment, the box body is provided with a partition extending along the second direction, the partition divides the installation groove into an electrical compartment and a battery cell compartment, and the exhaust channel is provided in the battery cell compartment.

[0013] In one embodiment, the detection device includes a BMS component and / or a BDU component.

[0014] In one embodiment, the battery pack further includes a thermal management component, which includes a mounting plate and a flow channel plate, wherein the mounting plate covers the opening of the mounting slot and is connected to the box body, and the flow channel plate is arranged on a side of the mounting plate away from the box body.

[0015] In one embodiment, the mounting plate and the battery core assembly are provided with thermally conductive structural adhesive.

[0016] In one embodiment, a bonding structural adhesive is provided between the bottom of the mounting groove and the battery cell assembly.

[0017] The present invention further provides a vehicle, comprising the battery pack, wherein the battery pack comprises:

[0018] A box body, the interior of which includes a mounting groove with an opening, an exhaust passage located at the bottom of the mounting groove and extending along the first direction, and an exhaust explosion-proof valve located at a side of the box body and docking with the exhaust passage;

[0019] A battery cell assembly, comprising a plurality of battery cells sequentially arranged at the bottom of the mounting groove along a first direction, wherein the explosion-proof valve of each of the battery cells is arranged toward the exhaust passage;

[0020] The high-voltage connection assembly is located on a side of the box body away from the exhaust explosion-proof valve and is electrically connected to the battery cell assembly for connecting the battery cell assembly with an external circuit.

[0021] In the technical solution of the present invention, the exhaust channel arranged in the box body can enable the exhaust valves of the multiple battery cells to quickly discharge high-pressure gas when the battery pack is thermally runaway, thereby reducing the contact between the high-temperature and high-pressure gas and the internal components of the battery pack, achieving the purpose of thermal and electrical separation, and improving the safety and stability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of an embodiment of a battery pack provided by the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure of the battery pack from another angle;

[0025] Figure 3 for Figure 1 The structural diagram of the middle box;

[0026] Figure 4 for Figure 3 Partial structural diagram of the middle box;

[0027] Figure 5 for Figure 4 A schematic diagram of the structure of the omitted part of the middle box;

[0028] Figure 6 for Figure 4 Another structural schematic diagram of the omitted part of the middle box;

[0029] Figure 7 for Figure 3 A cross-sectional view of the middle box;

[0030] Figure 8 for Figure 1 Schematic diagram of the structure of the thermal management component;

[0031] Fig. 9 for Figure 1 Schematic diagram of the structure of the battery cell.

[0032] Description of Figure Numbers:

[0033] 100. Battery pack;

[0034] 1. Box body; 11. Mounting slot; 111. Cell compartment; 112. Electrical compartment; 12. Exhaust passage; 13. Exhaust explosion-proof valve; 14. Connecting chamber; 15. Partition;

[0035] 2. Battery cell assembly; 21. Battery cell; 22. Explosion-proof valve; 23. Thermal conductive structural adhesive; 24. Adhesive structural adhesive;

[0036] 3. High voltage connection components;

[0037] 4. Detection device;

[0038] 5. Thermal management component; 51. Mounting plate; 52. Flow channel plate.

[0039] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] With the rapid development of the electric vehicle industry, battery technology has become a key factor restricting the performance and safety of electric vehicles. Although the development of large-capacity battery packs has improved the endurance of electric vehicles, it has also brought higher safety risks, especially thermal runaway. Thermal runaway may not only cause battery damage, but also cause fire or explosion, seriously threatening the safety of passengers and vehicles.

[0044] Existing battery pack designs are deficient in thermal runaway protection. The complex structure inside the battery pack may hinder the rapid discharge of high-pressure gas generated during thermal runaway, causing gas to accumulate inside the battery pack, increasing safety risks of the battery pack.

[0045] In order to solve the above technical problems, Figure 1 , Figure 2 , Figure 3 ,as well as Fig. 9 As shown, the battery pack 100 proposed in the present invention includes a box body 1, a battery cell 21 assembly 2 and a high-voltage connection assembly 3. The box body 1 includes a mounting groove 11 with an opening, an exhaust passage 12 located at the bottom of the mounting groove 11 and extending along the first direction, and an exhaust explosion-proof valve 13 located at the side of the box body 1 and connected to the exhaust passage 12; the battery cell 21 assembly 2 includes a plurality of battery cells 21 arranged at the bottom of the mounting groove 11 in sequence along the first direction, and the explosion-proof valve 22 of each battery cell 21 is arranged toward the exhaust passage 12; the pressure connection assembly is located on the side of the box body 1 away from the exhaust explosion-proof valve 13, and is electrically connected to the battery cell 21 assembly 2, and is used to connect the battery cell 21 assembly 2 with an external circuit.

[0046] In the technical solution of the present invention, the exhaust channel 12 provided in the box body 1 can enable the exhaust valves of the multiple battery cells 21 to quickly discharge high-pressure gas when the battery pack 100 thermally runs away, thereby reducing the contact between the high-temperature and high-pressure gas and the internal components of the battery pack 100, achieving the purpose of thermal and electrical separation, and improving the safety and stability of the battery pack 100.

[0047] In one embodiment, the bottom of the box body 1 is recessed in a direction away from the opening to form the exhaust channel 12. In this way, by recessing the bottom of the box body 1 to form the exhaust channel 12, the space inside the box body 1 can be effectively utilized. Not only does it provide sufficient installation space for the battery cell 21 assembly 2, but it also enables the exhaust channel 12 to provide a shortest and direct exhaust path for the high-pressure gas generated by the battery cell 21. When the explosion-proof valve 22 of the battery cell 21 is opened, the high-temperature and high-pressure gas can directly enter the exhaust channel 12, and then be discharged from the outside of the box body 1 through the exhaust explosion-proof valve 13, reducing the time and diffusion range of the gas in the box body 1, and it also makes the overall structure of the battery pack 100 more compact and regular. In addition, compared with independently constructing the exhaust channel 12, using the structure of the box body 1 itself to form the exhaust channel 12 may simplify the manufacturing process, reduce costs, and also reduce the number of components, which is conducive to improving assembly efficiency and reducing failure rates.

[0048] like Figures 4 to 6As shown, in one embodiment, the exhaust channel 12 is provided with a plurality of exhaust channels 12, and the plurality of exhaust channels 12 are arranged at intervals along the second direction, and the battery cell 21 assembly 2 is provided with a plurality of battery cell 21 assembly 2 corresponding to the battery cell 21 assembly 2, and a connecting chamber 14 is formed in the side wall of the box body 1, and the connecting chamber 14 connects the plurality of exhaust channels 12 and the exhaust explosion-proof valve 13. In this way, through the arrangement of the plurality of exhaust channels 12, when the battery pack 100 is in thermal runaway, each battery cell 21 or each group of battery cells 21 has its own exhaust path, and the high-pressure gas can be discharged from multiple positions at the same time, thereby improving the exhaust efficiency and uniformity. This helps to reduce the accumulation and diffusion of high-pressure gas inside the battery pack 100, and reduce the degree of damage to the battery pack 100 caused by the thermal runaway event. In addition, by arranging the plurality of exhaust channels 12 at intervals along the second direction and forming the connecting chamber 14 in the side wall of the box body 1, the discharge path of the high-pressure gas is further simplified, so that the high-pressure gas can be quickly discharged from the inside of the box body 1, reducing safety hazards.

[0049] In one embodiment, the battery pack 100 further includes a detection device 4, which is intermittently arranged in the mounting groove 11 in the first direction relative to the battery cell 21 assembly 2. In this way, through the localized, multi-point real-time monitoring of the status of the plurality of battery cells 21 by the detection device 4, the actual operation status of each battery cell 21 or each group of battery cells 21 can be understood, and all battery cells 21 can work in the best state, thereby improving the energy conversion efficiency and service life of the entire battery pack 100.

[0050] like Figure 7 As shown, in one embodiment, the box body 1 is provided with a partition 15 extending along the second direction, and the partition 15 divides the installation slot 11 into an electrical compartment 112 and a battery cell 21 compartment 111, and the exhaust channel 12 is provided in the battery cell 21 compartment 111. In this way, the installation slot 11 is divided into two independent areas - the electrical compartment 112 and the battery cell 21 compartment 111 by the partition 15, which are separated in physical space, and the battery cell 21 is isolated from the detection device 4, thereby reducing the impact of the battery cell 21 failure (such as thermal runaway or gas leakage) on the detection device 4. Even if the battery cell 21 is abnormal, the high-temperature and high-pressure gas generated will be confined in the battery cell 21 compartment 111 and quickly discharged through the exhaust channel 12, thereby reducing damage to sensitive components in the electrical compartment 112, greatly improving the safety of the entire battery pack 100. In addition, the partition 15 helps to optimize thermal management. Since the battery cell 21 generates heat during operation, and the heat is mainly concentrated in the battery cell 21 compartment 111 , the battery cell 21 compartment 111 can be effectively cooled by a designed cooling system to extend the service life.

[0051] In one embodiment, the detection device 4 includes a BMS component. In this way, the BMS component can monitor the temperature, voltage and other parameters of the battery cell 21 inside the battery pack 100 in real time, which can fully understand the state of the battery cell 21 and provide basic information for subsequent data analysis.

[0052] In one embodiment, the detection device 4 includes a BDU component. In this way, the BDU component can control the on and off of the battery cell 21 component 2. The BDU component may include but is not limited to a relay, a fuse, and an air pressure sensor.

[0053] like Figure 8 As shown, in one embodiment, the battery pack 100 further includes a thermal management component 5, and the thermal management component 5 includes a mounting plate 51 and a flow channel plate 52. The mounting plate 51 covers the opening of the mounting groove 11 and is connected to the box body 1, and the flow channel plate 52 is arranged on the side of the mounting plate 51 away from the box body 1. In this way, the mounting plate 51 covers the opening of the mounting groove 11, effectively sealing the battery cell 21 compartment 111 to prevent moisture, dust, etc. in the external environment from entering, and also provides a layer of physical protection for the internal components, thereby improving the durability and reliability of the battery pack 100. By integrating the thermal management component 5 into the structure of the battery pack 100, the original upper cover of the battery pack 100 is replaced, making the whole more compact and reducing the additional space occupation. This integrated design simplifies the assembly process, reduces the manufacturing cost, and is also convenient for maintenance and replacement. By locating the flow channel plate 52 on the side of the mounting plate 51 away from the box body 1, a coolant flow path is formed. Through this path, heat can be conducted from the surface of the battery core 21 to the flow channel plate 52, and then the flow channel plate 52 conducts the heat to the coolant in the flow channel plate 52 to take away the heat. This is beneficial to lowering the temperature of the battery core 21 and maintaining its stable working state.

[0054] In one embodiment, the mounting plate 51 and the battery cell 21 assembly 2 are provided with a heat-conducting structural adhesive 23. With such a configuration, the heat-conducting structural adhesive 23 has good thermal conductivity, and can quickly conduct the heat generated by the battery cell 21 to the mounting plate 51, and then dissipate it through the flow channel plate 52, which is conducive to maintaining the operating temperature of the battery cell 21 within a safe range and improving its working stability and life. In addition, the heat-conducting structural adhesive 23 can fill the tiny gaps caused by the inconsistency of the surface and flatness of the battery cell 21, so as to maximize the contact surface between the two, further optimize the heat transfer efficiency, and reduce the thermal resistance caused by the air layer.

[0055] In one embodiment, a bonding structural adhesive 24 is provided between the bottom of the mounting groove 11 and the battery cell 21 assembly 2. In this way, the battery cell 21 assembly 2 is firmly fixed to the bottom of the mounting groove 11 through the adhesive force provided by the bonding structural adhesive 24, reducing displacement or looseness caused by vibration or impact. In addition, compared with other fixing methods, the bonding structural adhesive 24 will not cause damage to the battery cell 21 assembly 2, and occupies a smaller volume, which is conducive to making the volume of the battery pack 100 more compact.

[0056] The present invention also proposes a vehicle, which includes a battery pack 100. The specific structure of the battery pack 100 refers to the above-mentioned embodiment. Since the vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0057] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body, the interior of which includes a mounting groove with an opening, an exhaust passage located at the bottom of the mounting groove and extending along the first direction, and an exhaust explosion-proof valve located at a side of the box body and docking with the exhaust passage; A battery cell assembly, comprising a plurality of battery cells sequentially arranged at the bottom of the mounting groove along a first direction, wherein the explosion-proof valve of each of the battery cells is arranged toward the exhaust passage; The high-voltage connection assembly is located on a side of the box body away from the exhaust explosion-proof valve and is electrically connected to the battery cell assembly for connecting the battery cell assembly with an external circuit.

2. The battery pack according to claim 1, characterized in that: The bottom of the box body is recessed in a direction away from the opening to form the exhaust passage.

3. The battery pack according to claim 1, wherein: There are multiple exhaust channels, which are spaced apart along the second direction. There are multiple battery cell assemblies corresponding to the battery cell assemblies. A connecting chamber is formed in the side wall of the box body, and the connecting chamber connects the multiple exhaust channels and the exhaust explosion-proof valve.

4. The battery pack according to claim 1, wherein: The battery pack further comprises a detection device, which is intermittently arranged in the installation groove in a first direction relative to the battery cell assembly.

5. The battery pack according to claim 4, characterized in that: The box body is provided with a partition extending along the second direction, the partition divides the installation groove into an electrical compartment and a battery cell compartment, and the exhaust channel is arranged in the battery cell compartment.

6. The battery pack according to claim 4, characterized in that: The detection device includes a BMS component and / or a BDU component.

7. The battery pack according to claim 1, characterized in that: The battery pack also includes a thermal management component, which includes a mounting plate and a flow channel plate. The mounting plate covers the opening of the mounting slot and is connected to the box body. The flow channel plate is arranged on a side of the mounting plate away from the box body.

8. The battery pack according to claim 7, characterized in that: The mounting plate and the battery core assembly are provided with heat-conducting structural adhesive.

9. The battery pack according to claim 1, characterized in that: A bonding structural adhesive is arranged between the bottom of the mounting groove and the battery core assembly.

10. A vehicle, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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