Battery pack and vehicle

Abstract

The utility model provides a battery pack and a vehicle, and the battery pack comprises a box body assembly which is internally provided with an installation space; the battery pack anti-explosion valve is mounted on one side of the box body assembly; a detection probe of the temperature detection component is arranged in the mounting space and located at the position, close to the battery pack anti-explosion valve, of the box body assembly so as to collect real-time temperature information including the real-time temperature of the periphery of the battery pack anti-explosion valve; the BMS is arranged in the installation space and connected with the temperature detection component so as to receive the real-time temperature information and calculate the corresponding real-time temperature rise rate according to the real-time temperature information. Whether the battery pack has the risk of thermal runaway or not is judged through at least one of the size relation between the real-time temperature and the preset temperature and the size relation between the real-time temperature rise rate and the preset temperature rise rate, so that the problem that a thermal runaway signal of the battery pack cannot be timely and effectively reported in the related technology is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery pack safety technology, and more specifically, to a battery pack and a vehicle. Background Technology

[0002] With the development of new energy vehicles, the safety of electric vehicles is receiving increasing attention. GB 38031-2020, "Safety Requirements for Power Batteries for Electric Vehicles," requires in section 5.2.7 that the battery pack or system should provide a thermal event alarm signal 5 minutes before thermal runaway of a single battery causes thermal diffusion, potentially leading to a hazard in the passenger compartment. The recommended criteria for triggering thermal runaway are as follows:

[0003] a) The triggering object generates a voltage drop, and the drop value exceeds 25% of the initial voltage;

[0004] b) The temperature at the monitoring point reaches the maximum operating temperature specified by the manufacturer;

[0005] c) The temperature rise rate at the monitoring point, dT / t, is ≥1℃ / s and lasts for more than 3s.

[0006] Thermal runaway is determined to have occurred when either a) and c) or b) and c) occur.

[0007] In the above-mentioned thermal runaway alarm strategy, when the voltage sampling line is open-circuited or the power supply line of the AFE (battery analog front end) that collects voltage and other signals is open-circuited, the voltage drop cannot be detected and the thermal runaway signal cannot be reported in a timely and effective manner. Utility Model Content

[0008] The main objective of this invention is to provide a battery pack and vehicle to solve the problem that thermal runaway signals of battery packs cannot be reported in a timely and effective manner in related technologies.

[0009] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a housing assembly having an installation space inside; a battery pack explosion-proof valve having an explosion-proof valve mounting hole on one side of the housing assembly, the battery pack explosion-proof valve being installed in the explosion-proof valve mounting hole; a temperature detection component having a detection probe disposed within the installation space and located on the housing assembly near the battery pack explosion-proof valve, for collecting real-time temperature information including the real-time temperature of the area surrounding the battery pack explosion-proof valve; and a BMS (Battery Management System) disposed within the installation space and connected to the temperature detection component for receiving real-time temperature information and calculating the corresponding real-time temperature rise rate based on the real-time temperature information.

[0010] Furthermore, the battery pack includes: a temperature acquisition line, the two ends of which are connected to a temperature detection component and a BMS, respectively; wherein, the temperature acquisition line is located on the side of the temperature detection component away from the battery pack explosion-proof valve.

[0011] Furthermore, the battery pack includes: multiple battery modules, each installed within an installation space, and each battery module including multiple cells; a voltage sampling circuit, including an FPC, which collects multiple cell voltage signals including the real-time cell voltages of each cell; wherein, the BMS is connected to the FPC to receive the multiple cell voltage signals, and to determine whether the battery pack is at risk of thermal runaway based on at least one of the following: the relationship between the real-time cell voltages of each cell and a preset real-time voltage, and whether the voltage sampling circuit is interrupted.

[0012] Furthermore, the voltage sampling circuit includes a power supply circuit for the BMS acquisition chip, which is positioned above multiple battery modules.

[0013] Furthermore, the enclosure assembly includes an enclosure, which includes: a base plate and a plurality of side plates sequentially connected around the periphery of the base plate to jointly form an installation cavity; a plurality of crossbeams, each crossbeam extending along a first direction, and the plurality of crossbeams being spaced apart in the installation cavity along a second direction perpendicular to the first direction to divide the installation cavity into a power distribution box installation cavity and a plurality of battery installation cavities located on one side of the power distribution box installation cavity; the battery pack includes a high-voltage power distribution box, which is installed in the power distribution box installation cavity.

[0014] Furthermore, the battery pack explosion-proof valve is located on one of the multiple side plates and on the side of the corresponding side plate away from the installation space; the detection probe of the temperature detection component is set on the crossbeam near the outer side of the enclosure and is located on the side plate of the corresponding crossbeam near where the battery pack explosion-proof valve is installed.

[0015] Furthermore, the enclosure includes: multiple longitudinal beams, each extending along a second direction, the multiple longitudinal beams being spaced apart along a first direction, each battery mounting cavity having a portion of each longitudinal beam to be divided into multiple battery cavity portions; the battery pack includes: multiple battery components, the multiple battery components being installed one-to-one in the multiple battery cavity portions of the enclosure; a BMS bracket, the BMS brackets being located on the side of the multiple longitudinal beams away from the bottom plate, the BMS being installed on the side of the BMS bracket away from the multiple longitudinal beams; a low-voltage wiring harness and a first main high-voltage connector, the low-voltage wiring harness and the first main high-voltage connector being located on the side of the multiple longitudinal beams away from the bottom plate, and the low-voltage wiring harness and the first main high-voltage connector being located on different longitudinal beams; wherein, the low-voltage wiring harness includes a temperature acquisition line for connecting the temperature detection component and the BMS, and the voltage sampling circuit includes a portion of the low-voltage wiring harness.

[0016] Furthermore, the height of each longitudinal beam is less than the height of each crossbeam and less than the height of the battery assembly; and / or the height of each side plate is less than the height of each crossbeam and less than the height of the battery assembly; and / or the crossbeam is provided with a clearance opening for avoiding the low-voltage wiring harness or the first main high-voltage connector.

[0017] Furthermore, the enclosure assembly includes a cover that is disposed on the enclosure. The cover includes a main cover body and a cover protrusion located on the side of the main cover body away from the enclosure body. The main cover body is fixedly connected to the enclosure body, and the inner side of the cover protrusion forms a clearance space for accommodating the BMS.

[0018] Furthermore, the area of ​​the projection of the box cover protrusion onto a predetermined plane parallel to the base plate is S1, and the area of ​​the projection of the main cover onto the predetermined plane is S2; wherein, 1 / 4≤S1 / S2≤1 / 3.

[0019] Furthermore, the battery pack includes a second main high-voltage connector, which is fixed to the crossbeam and located on the side of the multiple longitudinal beams near the high-voltage distribution box. One end of the second main high-voltage connector is connected to the high-voltage distribution box, and the other end of the second main high-voltage connector is connected to the positive terminal connector of the multiple battery modules.

[0020] Furthermore, the battery pack includes: a first high-voltage connector for connecting two adjacent battery components located in the same battery cavity; and a second high-voltage connector for connecting two battery components located in two adjacent battery cavities.

[0021] According to another aspect of the present invention, a vehicle is provided, comprising: a battery pack, wherein the battery pack is the aforementioned battery pack; a vehicle controller, wherein the vehicle controller is connected to a BMS for issuing a thermal runaway alarm signal upon receiving a thermal runaway fault signal from the BMS; and a vehicle instrument cluster, wherein the vehicle instrument cluster is connected to the vehicle controller for receiving the thermal runaway alarm signal and issuing a thermal runaway alarm.

[0022] Furthermore, the battery pack includes: a BMS signal transmission line, the two ends of which are connected to the BMS and the vehicle controller, respectively; wherein, the BMS signal transmission line is located on the side of the temperature detection component away from the battery pack explosion-proof valve.

[0023] Applying the technical solution of this utility model, the battery pack of this utility model includes: a housing assembly, the housing assembly having an installation space inside; a battery pack explosion-proof valve, the housing assembly having an explosion-proof valve mounting hole on one side, the battery pack explosion-proof valve being installed in the explosion-proof valve mounting hole; a temperature detection component, the temperature detection component having a detection probe disposed within the installation space and located on the housing assembly near the battery pack explosion-proof valve, for collecting real-time temperature information including the real-time temperature around the battery pack explosion-proof valve; and a BMS, the BMS being disposed within the installation space and connected to the temperature detection component, for receiving real-time temperature information and calculating the corresponding real-time temperature rise rate based on the real-time temperature information, so as to determine whether the battery pack is at risk of thermal runaway by at least one of the magnitude relationship between the real-time temperature and the preset temperature and the magnitude relationship between the real-time temperature rise rate and the preset temperature rise rate. In this way, the battery pack of this utility model, by setting a battery pack explosion-proof valve and a temperature detection component connected to the BMS, enables the high-temperature gas generated when the battery cells in the battery pack experience thermal runaway to be discharged in a timely manner through the battery pack explosion-proof valve. The real-time temperature and real-time temperature rise rate around the battery pack explosion-proof valve are used to determine whether thermal runaway has occurred in the battery pack. This solves the problem of the inability to report thermal runaway signals in a timely and effective manner in related technologies. It avoids the phenomenon that the voltage drop cannot be detected due to an open circuit in the voltage sampling line or an open circuit in the power supply line of the AFE (battery analog front end) that collects voltage signals, thus preventing the timely and effective reporting of thermal runaway signals. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0025] Figure 1 An isometric view of an embodiment of the battery pack according to the present invention is shown in a first direction;

[0026] Figure 2 It shows Figure 1 The image shows an isometric view of the battery cells of the battery pack assembly.

[0027] Figure 3 It shows Figure 1 A top view of the battery pack shown;

[0028] Figure 4 It shows Figure 2 The battery pack shown is a top view excluding components such as the BMS.

[0029] Figure 5 It shows Figure 1 The isometric view of the battery pack housing shown;

[0030] Figure 6 It shows Figure 1 An exploded view of a portion of the battery pack structure is shown.

[0031] Figure 7 It shows Figure 1 The battery pack shown is an isometric view in the second direction;

[0032] Figure 8 It shows Figure 1 The battery pack shown is an isometric view in the third direction;

[0033] Figure 9 It shows Figure 1 An exploded view of the battery pack shown.

[0034] Figure 10 It shows Figure 1 The diagram shows the structure of the low-voltage wiring harness, the first main high-voltage connector, and the second main high-voltage connector of the battery pack.

[0035] Figure 11 It shows Figure 1 The diagram shows the connection between the battery pack and the vehicle controller and instrument cluster.

[0036] The above figures include the following reference numerals:

[0037] 1. Enclosure; 11. Base plate; 12. Side plate; 121. First side plate; 122. Second side plate; 13. Mounting cavity; 14. Crossbeam; 141. First crossbeam; 142. Second crossbeam; 143. Third crossbeam; 15. Distribution box mounting cavity; 16. Battery mounting cavity; 17. Longitudinal beam; 171. First longitudinal beam; 172. Second longitudinal beam; 18. Battery cavity section; 19. Support frame;

[0038] 2. Low-voltage wiring harness; 21. Low-voltage connecting wire; 22. Outer sleeve; 23. Wiring harness fastener; 24. First longitudinal pipe section; 25. First transverse pipe section; 26. Second transverse pipe section;

[0039] 3. First main high-voltage connector; 31. Connecting plate; 32. Longitudinal plate; 33. Transverse plate; 34. First longitudinal plate; 35. Transition plate; 36. Second longitudinal plate; 37. First plate fixing component;

[0040] 4. BMS bracket;

[0041] 5. BMS;

[0042] 6. Battery assembly; 61. Battery cell; 62. Battery cell explosion-proof valve;

[0043] 7. High-voltage distribution box;

[0044] 8. Box lid; 81. Main lid body; 82. Box lid protrusion;

[0045] 9. CCS component;

[0046] 10. Second main high-voltage connector; 20. First auxiliary high-voltage connector; 30. Second auxiliary high-voltage connector; 40. Temperature detection component; 50. Temperature acquisition circuit; 60. FPC; 70. Battery pack explosion-proof valve;

[0047] 100. Battery pack; 200. Vehicle controller; 300. Vehicle instrument panel; 400. BMS signal transmission line. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0051] like Figures 1 to 11As shown, this utility model provides a battery pack, including: a housing assembly with an installation space inside; a battery pack explosion-proof valve 70, with an explosion-proof valve mounting hole on one side of the housing assembly, in which the battery pack explosion-proof valve 70 is installed; a temperature detection component 40, with its detection probe disposed within the installation space and located on the housing assembly near the battery pack explosion-proof valve 70, for collecting real-time temperature information including the real-time temperature of the area surrounding the battery pack explosion-proof valve 70; and a battery management system (BMS5), disposed within the installation space and connected to the temperature detection component 40, for receiving real-time temperature information and calculating the corresponding real-time temperature rise rate based on the real-time temperature information, so as to determine whether the battery pack is at risk of thermal runaway by at least one of the magnitude relationship between the real-time temperature and a preset temperature and the magnitude relationship between the real-time temperature rise rate and the preset temperature rise rate.

[0052] In this way, the battery pack of this utility model, by setting a battery pack explosion-proof valve 70 and a temperature detection component 40 connected to the BMS5, can ensure that the high-temperature gas generated when the battery cells in the battery pack's battery assembly 6 experience thermal runaway is discharged in a timely manner through the battery pack explosion-proof valve 70. Furthermore, it can determine whether thermal runaway has occurred in the battery pack based on the real-time temperature and real-time temperature rise rate around the battery pack explosion-proof valve 70. This solves the problem in related technologies where thermal runaway signals cannot be reported in a timely and effective manner. It also avoids the phenomenon where a voltage drop cannot be detected due to an open circuit in the voltage sampling line or an open circuit in the power supply line of the AFE (battery analog front-end) that collects voltage signals, thus preventing the timely and effective reporting of thermal runaway signals.

[0053] like Figure 11 As shown, the battery pack includes a temperature acquisition line 50, with its two ends connected to the temperature detection component 40 and the BMS5, respectively; wherein, the temperature acquisition line 50 is located on the side of the temperature detection component 40 away from the battery pack explosion-proof valve 70.

[0054] explain

[0055] This reduces the probability of the temperature acquisition line 50 being damaged by the high temperature in the installation space of the enclosure components, and avoids the disconnection of the thermal runaway fault signal.

[0056] like Figure 1 , Figure 3 and Figure 4As shown, the battery pack includes: multiple battery modules 6, each battery module 6 is installed in an installation space, each battery module 6 includes multiple cells 61, and each cell 61 has a cell explosion-proof valve 62 on its top side away from the installation space; a voltage sampling circuit, including an FPC 60, which is positioned above the multiple battery modules 6 and spaced apart from the cell explosion-proof valves 62 of each cell 61 of each battery module 6, for collecting multiple cell voltage signals including the real-time cell voltage of each cell 61; wherein, the BMS 5 is connected to the FPC 60 to receive the multiple cell voltage signals, and determines whether the battery pack is at risk of thermal runaway based on at least one of the following: the relationship between the real-time cell voltage of each cell 61 and a preset real-time voltage, and whether the voltage sampling circuit is interrupted.

[0057] This increases the accuracy of BMS5 in detecting thermal runaway, further avoiding the phenomenon that the voltage drop cannot be detected due to an open circuit in the voltage sampling line or an open circuit in the power supply line of the AFE (battery simulation front end) that collects voltage and other signals, thus failing to report the thermal runaway signal in a timely and effective manner. It also further avoids the problem of the battery pack's thermal runaway signal not being reported in a timely and effective manner in related technologies.

[0058] When thermal runaway occurs in cell 61, the cell explosion-proof valve 62 on it will open. The gap between FPC60 and cell explosion-proof valve 62 provides clearance for the opening of the valve of cell explosion-proof valve 62, so that the valve of cell explosion-proof valve 62 can be opened smoothly.

[0059] Specifically, the voltage sampling circuit also includes a BMS acquisition chip power supply circuit, which is located above multiple battery modules 6. The voltage sampling circuit is interrupted when the BMS acquisition chip power supply circuit is interrupted.

[0060] like Figure 9 As shown, the enclosure assembly includes an enclosure 1 having a mounting cavity 13 and a cover 8 covering the enclosure 1, the enclosure 1 and the cover 8 together forming an installation space; the battery pack includes a CCS assembly 9, which is disposed between multiple battery assemblies 6 and the cover 8, and the CCS assembly 9 includes an FPC 60.

[0061] like Figure 5As shown, the enclosure assembly includes an enclosure 1, which includes a base plate 11 and a plurality of side plates 12 connected sequentially around the periphery of the base plate 11 to form an installation cavity 13; a plurality of crossbeams 14, each of which extends along a first direction and is spaced apart in the installation cavity 13 along a second direction perpendicular to the first direction to divide the installation cavity 13 into a power distribution box installation cavity 15 and a plurality of battery installation cavities 16 located on one side of the power distribution box installation cavity 15; and a battery pack including a high-voltage power distribution box 7, which is installed in the power distribution box installation cavity 15.

[0062] The first and second directions of this utility model are both parallel to the base plate 11.

[0063] Specifically, there are three crossbeams 14, including a first crossbeam 141, a second crossbeam 142, and a third crossbeam 143 arranged sequentially and at intervals along the second direction; wherein, the two ends of each longitudinal beam 17 are in contact with the first crossbeam 141 and the third crossbeam 143 respectively, and the second crossbeam 142 is provided with multiple clearance grooves for correspondingly avoiding multiple longitudinal beams 17.

[0064] like Figure 1 As shown, the battery pack explosion-proof valve 70 is located on one of the multiple side plates 12 and on the side of the corresponding side plate 12 away from the mounting cavity 13; the detection probe of the temperature detection component 40 is set on the third crossbeam 143 and is located on the third crossbeam 143 near the side plate 12 on which the battery pack explosion-proof valve 70 is installed.

[0065] like Figure 5 As shown, the housing 1 includes: multiple longitudinal beams 17, each extending along a second direction, the multiple longitudinal beams 17 being spaced apart along a first direction, each battery mounting cavity 16 having a portion of each longitudinal beam 17 to be divided into multiple battery cavity portions 18; the battery pack includes: multiple battery components 6, the multiple battery components 6 being installed one-to-one in the multiple battery cavity portions 18 of the housing 1; a BMS bracket 4, the BMS bracket 4 being located on the side of the multiple longitudinal beams 17 away from the bottom plate 11, and a BMS5 being installed on the side of the BMS bracket 4 away from the multiple longitudinal beams 17; a low-voltage wiring harness 2 and a first main high-voltage connector 3, the low-voltage wiring harness 2 and the first main high-voltage connector 3 being located on the side of the multiple longitudinal beams 17 away from the bottom plate 11, and the low-voltage wiring harness 2 and the first main high-voltage connector 3 being located on different longitudinal beams 17; wherein, the low-voltage wiring harness 2 includes a temperature acquisition line 50 for connecting the temperature detection component 40 and the BMS5, and the voltage sampling circuit includes a portion of the low-voltage wiring harness 2.

[0066] In this way, the battery pack housing of this utility model installs the low-voltage wiring harness 2 and the first main high-voltage connector 3 and other components of the battery pack by setting multiple crossbeams 14 and multiple longitudinal beams 17 in the mounting cavity 13. This solves the problem of the battery pack having a large height in related technologies, improves the overall reliability of the battery pack, simplifies the fixing method of the low-voltage wiring harness 2 and the first main high-voltage connector 3, and reduces the production cost of the battery pack.

[0067] Specifically, the voltage sampling circuit also includes a first part of a low-voltage harness, and a second part of the low-voltage harness for connecting the BMS5 and the temperature acquisition line 50.

[0068] The height of each longitudinal beam 17 is less than the height of each crossbeam 14 and less than the height of the battery assembly 6; and / or the height of each side plate 12 is less than the height of each crossbeam 14 and less than the height of the battery assembly 6; and / or the crossbeam 14 is provided with a clearance opening for avoiding the low-voltage wiring harness 2 or the first main high-voltage connector 3.

[0069] This allows the battery pack to require a sufficiently small space in the vertical direction.

[0070] like Figure 5 As shown, the plurality of side plates 12 include a first side plate 121 that is close to and parallel to the first crossbeam 141. The first side plate 121 and the first crossbeam 141 are spaced apart to form a distribution box mounting cavity 15.

[0071] like Figure 5 As shown, the multiple side plates 12 include a second side plate 122 that is close to and parallel to the third crossbeam 143, and the second side plate 122 and the third crossbeam 143 are in contact with each other; wherein, the first longitudinal beam 171 is used to fix the first part of the low voltage harness 2, the second longitudinal beam 172 is used to fix the first part of the first main high voltage connector 3, the first crossbeam 141 is used to fix the second part of the low voltage harness 2, and the third crossbeam 143 is used to fix the third part of the low voltage harness 2 and the second part of the first main high voltage connector 3.

[0072] The first longitudinal beam 171 on the housing of this utility model is used to fix the first part of the low voltage wiring harness 2 and the BMS bracket 4. The two ends of the first longitudinal beam 171 are respectively connected to the first crossbeam 141 and the third crossbeam 143 to strengthen the first crossbeam 141 and the third crossbeam 143 against expansion force and to strengthen the overall structural strength of the housing.

[0073] The second longitudinal beam 172 on the housing of this utility model is used to fix the first part of the first main high voltage connector 3 and the first part of the BMS bracket 4. The two ends of the second longitudinal beam 172 are respectively connected to the first crossbeam 141 and the third crossbeam 143 to strengthen the first crossbeam 141 and the third crossbeam 143 against expansion force and to strengthen the overall structural strength of the housing.

[0074] The first crossbeam 141 on the housing of this utility model is used to fix the second part of the low-voltage wiring harness 2 and constrain the expansion of the battery assembly 6 in its own length direction, thereby improving the overall strength of the battery pack and resisting the lateral extrusion force generated inside the battery pack.

[0075] The second crossbeam 142 on the housing of this utility model is used to constrain the expansion of the battery assembly 6 in its own length direction, improve the overall strength of the battery pack, and resist the lateral extrusion force generated inside the battery pack.

[0076] The third crossbeam 143 on the housing of this utility model is used to fix the third part of the low-voltage wiring harness 2 and the second part of the first main high-voltage connector 3, as well as to seal the rear side of the housing, and to constrain the expansion of the battery assembly 6 in its own length direction, thereby improving the overall strength of the battery pack and resisting the lateral extrusion force generated inside the battery pack.

[0077] like Figure 9 As shown, the enclosure assembly includes a cover 8 that is placed on the enclosure 1. The cover 8 includes a main cover body 81 and a cover protrusion 82 located on the side of the main cover body 81 away from the enclosure 1. The main cover body 81 is fixedly connected to the enclosure 1, and the inner side of the cover protrusion 82 forms a clearance space for accommodating the BMS5.

[0078] Specifically, the area of ​​the projection of the box cover protrusion 82 onto a predetermined plane parallel to the base plate 11 is S1, and the area of ​​the projection of the main cover 81 onto the predetermined plane is S2; wherein, 1 / 4≤S1 / S2≤1 / 3.

[0079] In this way, the battery pack of this invention has a large height only at BMS5, while having a small height at other locations. While ensuring the proper placement of BMS5, the installation of the battery pack of this invention does not require a large installation space.

[0080] In the first embodiment of the battery pack cover 8 of this utility model, the ratio of the area of ​​the projection of the cover protrusion 82 on a predetermined plane parallel to the base plate 11 to the area of ​​the projection of the main cover 81 on the predetermined plane to S2 is 1 / 4.

[0081] In the second embodiment of the battery pack cover 8 of this utility model, the ratio of the area of ​​the projection of the cover protrusion 82 on a predetermined plane parallel to the base plate 11 to the area of ​​the projection of the main cover 81 on the predetermined plane to S2 is 0.28.

[0082] In the third embodiment of the battery pack cover 8 of this utility model, the ratio of the area of ​​the projection of the cover protrusion 82 on a predetermined plane parallel to the base plate 11 to the area of ​​the projection of the main cover 81 on the predetermined plane to S2 is 0.3.

[0083] In the fourth embodiment of the battery pack cover 8 of this utility model, the ratio of the area of ​​the projection of the cover protrusion 82 on a predetermined plane parallel to the base plate 11 to the area of ​​the projection of the main cover 81 on the predetermined plane to S2 is 1 / 3.

[0084] like Figure 10 As shown, the low-voltage wiring harness 2 includes: a plurality of low-voltage connecting wires 21, each of which is connected to the BMS5; and an outer sleeve 22, which is sleeved on the plurality of low-voltage connecting wires 21 and at least a portion of the outer sleeve 22 is fixed to the longitudinal beam 17.

[0085] like Figure 10 As shown, the low-voltage wiring harness 2 includes multiple wiring harness fasteners 23, which are spaced apart along the extension direction of the outer sleeve 22. The end of each wiring harness fastener 23 away from the outer sleeve 22 is used to fix it to the longitudinal beam 17 or the transverse beam 14.

[0086] like Figure 10 As shown, the outer sleeve 22 includes a first longitudinal pipe section 24 and a first transverse pipe section 25 and a second transverse pipe section 26 located at both ends of the first longitudinal pipe section 24. The first longitudinal pipe section 24 is fixed to the longitudinal beam 17, and the first transverse pipe section 25 and the second transverse pipe section 26 are respectively fixed to two of the plurality of transverse beams 14.

[0087] like Figure 3 As shown, the housing 1 includes two first support frames 19. The two first support frames 19 are respectively set at both ends of one of the multiple longitudinal beams 17 and are located on the side of the corresponding longitudinal beam 17 away from the bottom plate 11. The middle part of the first longitudinal pipe section 24 is fixed on the corresponding longitudinal beam 17, and the two ends of the first longitudinal pipe section 24 are respectively fixed on the two first support frames 19.

[0088] Specifically, the middle part of the first longitudinal pipe section 24 is fixed to the corresponding first longitudinal beam 171 by the first part of the multiple wire harness fasteners 23, the two ends of the first longitudinal pipe section 24 are respectively fixed to the two first support frames 19 by the second part of the multiple wire harness fasteners 23, the first transverse pipe section 25 is fixed to the first transverse beam 14 by the third part of the multiple wire harness fasteners 23, and the second transverse pipe section 26 is fixed to the third transverse beam 143 by the third part of the multiple wire harness fasteners 23.

[0089] like Figure 10As shown, the first main high-voltage connector 3 includes a connecting plate 31, which includes a longitudinal plate 32 and a transverse plate 33 connected to each other. The longitudinal plate 32 is fixed to the longitudinal beam 17, and the transverse plate 33 is fixed to the transverse beam 14 and located at the end of the longitudinal plate 32 away from the high-voltage distribution box 7. The end of the longitudinal plate 32 away from the transverse plate 33 is connected to the high-voltage distribution box 7, and the end of the transverse plate 33 away from the longitudinal plate 32 is connected to the negative terminal connector of the multiple battery modules 6.

[0090] like Figure 10 As shown, the longitudinal plate 32 includes a first longitudinal plate 34, a transition plate 35, and a second longitudinal plate 36 connected in sequence. The surface of the first longitudinal plate 34 is parallel to the longitudinal beam 17, and the surface of the second longitudinal plate 36 is perpendicular to the longitudinal beam 17.

[0091] like Figure 10 As shown, the first main high voltage connector 3 includes a plurality of first plate fixing members 37, which are spaced apart along the extension direction of the connecting plate 31. The end of each first plate fixing member 37 away from the connecting plate 31 is used to fix it to the longitudinal beam 17 or the transverse beam 14.

[0092] Specifically, the first longitudinal plate 34 is fixed to the second longitudinal beam 172 by the first part of the plurality of first plate fasteners 37, the second longitudinal plate 36 is fixed to the second support frame on the second longitudinal beam 172 by the second part of the plurality of first plate fasteners 37, and the transverse plate 33 is fixed to the third transverse beam 143 by the second part of the plurality of first plate fasteners 37.

[0093] like Figure 9 and Figure 10 As shown, the battery pack includes a second main high-voltage connector 10. The second main high-voltage connector 10 is fixed to the crossbeam 14 and located on the side of the plurality of longitudinal beams 17 near the high-voltage distribution box 7. One end of the second main high-voltage connector 10 is connected to the high-voltage distribution box 7, and the other end of the second main high-voltage connector 10 is connected to the positive terminal connector of the plurality of battery components 6.

[0094] Specifically, the first part of the second main high voltage connector 10 is fixed to the first crossbeam 141 by a plurality of second plate fasteners, and the second part of the second main high voltage connector 10 is located in the distribution box mounting cavity 15 to avoid occupying too much space of the battery pack in the height direction.

[0095] like Figure 3 As shown, the battery pack includes: a first high-voltage connector 20, which is used to connect two adjacent battery components 6 located in the same battery cavity 18; and a second high-voltage connector 30, which is used to connect two battery components 6 located in two adjacent battery cavities 18 respectively.

[0096] One specific thermal runaway alarm strategy for the battery pack of this utility model is as follows:

[0097] (1) There are four judgment conditions in total.

[0098] a. The real-time individual cell voltage of each cell 61 is less than or equal to the preset individual cell voltage m, and the duration before the fault is triggered is the first preset time t1, and the holding time after the fault is triggered is the fifth preset time k1.

[0099] b. Any single-unit voltage signal is interrupted, and the duration before the fault is triggered is the second preset time t2, and the holding time after the fault is triggered is the sixth preset time k2;

[0100] c. The real-time temperature around the battery pack explosion-proof valve 70 is greater than or equal to the preset temperature T, and the duration before the fault is triggered is the third preset time t3, and the holding time after the fault is triggered is the seventh preset time k3.

[0101] d. The real-time temperature rise rate around the battery pack explosion-proof valve 70 is greater than or equal to the preset temperature rise rate n, and the duration before the fault is triggered is the fourth preset time t4, and the holding time after the fault is triggered is the eighth preset time k4.

[0102] (2) Situations where a thermal runaway fault signal is issued

[0103] If both conditions a and c are met, it is determined that the battery pack is at risk of thermal runaway, and BMS5 issues a thermal runaway fault signal.

[0104] If both conditions a and d are met, it is determined that the battery pack is at risk of thermal runaway, and BMS5 issues a thermal runaway fault signal.

[0105] If both conditions b and c are met, it is determined that the battery pack is at risk of thermal runaway, and BMS5 issues a thermal runaway fault signal.

[0106] If both conditions b and d are met, it is determined that the battery pack is at risk of thermal runaway, and BMS5 issues a thermal runaway fault signal.

[0107] like Figure 11 As shown, this utility model provides a vehicle, including: a battery pack 100, which is the aforementioned battery pack; a vehicle controller 200, which is connected to a BMS5 to issue a thermal runaway alarm signal upon receiving a thermal runaway fault signal from the BMS5; and a vehicle instrument cluster 300, which is connected to the vehicle controller 200 to receive the thermal runaway alarm signal and issue a thermal runaway alarm. This allows the thermal runaway alarm to be quickly and accurately transmitted to the driver.

[0108] Specifically, the battery pack 100 includes a BMS signal transmission line 400, with both ends of the BMS signal transmission line 400 connected to the BMS 5 and the vehicle controller 200, respectively. The BMS signal transmission line 400 is located on the side of the temperature detection component 40 furthest from the battery pack explosion-proof valve 70. This reduces the probability of the BMS signal transmission line 400 being damaged by the high temperatures within the mounting space of the enclosure components, further preventing the disconnection of the thermal runaway fault signal.

[0109] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0110] The battery pack of this utility model includes: a housing assembly with an installation space inside; a battery pack explosion-proof valve 70 with an explosion-proof valve mounting hole on one side of the housing assembly, in which the battery pack explosion-proof valve 70 is installed; a temperature detection component 40 with a detection probe disposed within the installation space and located on the housing assembly near the battery pack explosion-proof valve 70, for collecting real-time temperature information including the real-time temperature of the area surrounding the battery pack explosion-proof valve 70; and a battery management system (BMS5) disposed within the installation space and connected to the temperature detection component 40, for receiving real-time temperature information and calculating the corresponding real-time temperature rise rate based on the real-time temperature information, so as to determine whether the battery pack is at risk of thermal runaway by at least one of the following: the relationship between the real-time temperature and a preset temperature, and the relationship between the real-time temperature rise rate and the preset temperature rise rate. In this way, the battery pack of this utility model, by setting a battery pack explosion-proof valve 70 and a temperature detection component 40 connected to the BMS5, can ensure that the high-temperature gas generated when the battery cells in the battery pack's battery assembly 6 experience thermal runaway is discharged in a timely manner through the battery pack explosion-proof valve 70. Furthermore, it can determine whether thermal runaway has occurred in the battery pack based on the real-time temperature and real-time temperature rise rate around the battery pack explosion-proof valve 70. This solves the problem in related technologies where thermal runaway signals cannot be reported in a timely and effective manner. It also avoids the phenomenon where a voltage drop cannot be detected due to an open circuit in the voltage sampling line or an open circuit in the power supply line of the AFE (battery analog front-end) that collects voltage signals, thus preventing the timely and effective reporting of thermal runaway signals.

[0111] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0112] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0113] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0114] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: A housing assembly, wherein an installation space is provided inside the housing assembly; Battery pack explosion-proof valve (70), an explosion-proof valve mounting hole is provided on one side of the housing assembly, and the battery pack explosion-proof valve (70) is installed in the explosion-proof valve mounting hole; Temperature detection component (40), wherein the detection probe of the temperature detection component (40) is disposed in the installation space and located on the housing assembly near the battery pack explosion-proof valve (70) for collecting real-time temperature information including the real-time temperature of the surrounding area of ​​the battery pack explosion-proof valve (70); BMS (5), which is located in the installation space and connected to the temperature detection component (40), is used to receive the real-time temperature information and calculate the corresponding real-time temperature rise rate based on the real-time temperature information.

2. The battery pack according to claim 1, characterized in that, The battery pack includes: Temperature acquisition line (50), the two ends of which are respectively connected to the temperature detection component (40) and the BMS (5); The temperature acquisition line (50) is located on the side of the temperature detection component (40) away from the battery pack explosion-proof valve (70).

3. The battery pack according to claim 1, characterized in that, The battery pack includes: Multiple battery modules (6) are installed in the installation space, and each battery module (6) includes multiple battery cells (61). A voltage sampling circuit, the voltage sampling circuit including an FPC (60), the FPC (60) acquiring multiple individual voltage signals including the real-time individual voltage of each of the cells (61); The BMS (5) is connected to the FPC (60) to receive the multiple cell voltage signals, and to determine whether the battery pack is at risk of thermal runaway based on at least one of the following: the relationship between the real-time cell voltage of each cell (61) and the preset real-time voltage and whether the voltage sampling circuit is interrupted.

4. The battery pack according to claim 3, characterized in that, The voltage sampling circuit includes a BMS acquisition chip power supply circuit, which is located above the plurality of battery components (6).

5. The battery pack according to claim 3, characterized in that, The enclosure assembly includes an enclosure (1), the enclosure (1) comprising: A base plate (11) and a plurality of side plates (12) connected in sequence around the periphery of the base plate (11) together form a mounting cavity (13); Multiple crossbeams (14) are provided, each of which extends along a first direction. The multiple crossbeams (14) are spaced apart in the mounting cavity (13) along a second direction perpendicular to the first direction, so as to divide the mounting cavity (13) into a power distribution box mounting cavity (15) and multiple battery mounting cavities (16) located on one side of the power distribution box mounting cavity (15). The battery pack includes a high-voltage distribution box (7), which is installed inside the distribution box mounting cavity (15).

6. The battery pack according to claim 5, characterized in that, The battery pack explosion-proof valve (70) is located on one of the plurality of side plates (12) and on the side of the respective side plate (12) away from the mounting space; The detection probe of the temperature detection component (40) is located on the crossbeam (14) on the outside of the housing (1) and is located on the side plate (12) of the corresponding crossbeam (14) near where the battery pack explosion-proof valve (70) is installed.

7. The battery pack according to claim 6, characterized in that, The housing (1) includes: a plurality of longitudinal beams (17), each of the longitudinal beams (17) extending along the second direction, the plurality of longitudinal beams (17) being spaced apart along the first direction, and each of the battery mounting cavities (16) having portions of each of the longitudinal beams (17) to be divided into a plurality of battery cavity portions (18); the battery pack includes: Multiple battery components (6) are installed one-to-one in multiple battery cavities (18) of the housing (1); BMS bracket (4), the BMS bracket (4) is located on the side of the plurality of longitudinal beams (17) away from the base plate (11), and the BMS (5) is installed on the side of the BMS bracket (4) away from the plurality of longitudinal beams (17); The low-voltage wiring harness (2) and the first main high-voltage connector (3) are both located on the side of the plurality of longitudinal beams (17) away from the base plate (11), and the low-voltage wiring harness (2) and the first main high-voltage connector (3) are located on different longitudinal beams (17). The low-voltage harness (2) includes a temperature acquisition line (50) for connecting the temperature detection component (40) and the BMS (5), and the voltage sampling circuit includes a portion of the low-voltage harness (2).

8. The battery pack according to claim 7, characterized in that, The height of each of the longitudinal beams (17) is less than the height of each of the transverse beams (14) and less than the height of the battery assembly (6); and / or The height of each of the side panels (12) is less than the height of each of the crossbeams (14) and less than the height of the battery assembly (6); and / or The crossbeam (14) is provided with a clearance opening for avoiding the low-voltage wiring harness (2) or the first main high-voltage connector (3).

9. The battery pack according to claim 7, characterized in that, The housing assembly includes a cover (8) covering the housing (1), the cover (8) including a main cover (81) and a cover protrusion (82) located on the side of the main cover (81) away from the housing (1), the main cover (81) being fixedly connected to the housing (1), and the inner side of the cover protrusion (82) forming a clearance space for accommodating the BMS (5).

10. The battery pack according to claim 9, characterized in that, The area of ​​the projection of the box cover protrusion (82) onto a predetermined plane parallel to the base plate (11) is S1, and the area of ​​the projection of the main cover (81) onto the predetermined plane is S2; wherein, 1 / 4≤S1 / S2≤1 / 3.

11. The battery pack according to claim 7, characterized in that, The battery pack includes a second main high-voltage connector (10), which is fixed to the crossbeam (14) and located on the side of the plurality of longitudinal beams (17) near the high-voltage distribution box (7). One end of the second main high-voltage connector (10) is connected to the high-voltage distribution box (7), and the other end of the second main high-voltage connector (10) is connected to the positive terminal connector of the plurality of battery components (6).

12. The battery pack according to claim 7, characterized in that, The battery pack includes: The first high-voltage connector (20) is used to connect two adjacent battery assemblies (6) located in the same battery cavity (18); The second high-voltage connector (30) is used to connect two battery assemblies (6) located in two adjacent battery cavity portions (18).

13. A vehicle, characterized in that, include: A battery pack (100), wherein the battery pack (100) is the battery pack according to any one of claims 1 to 12; The vehicle controller (200) is connected to the BMS (5) to issue a thermal runaway alarm signal when it receives a thermal runaway fault signal from the BMS (5); The vehicle instrument panel (300) is connected to the vehicle controller (200) to receive thermal runaway alarm signals and issue thermal runaway alarms.

14. The vehicle according to claim 13, characterized in that, The battery pack (100) includes: BMS signal transmission line (400), the two ends of which are connected to the BMS (5) and the vehicle controller (200) respectively; The BMS signal transmission line (400) is located on the side of the temperature detection component (40) away from the battery pack explosion-proof valve (70).

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