Battery devices and vehicles

Abstract

This disclosure relates to a battery device and a vehicle. The battery device includes multiple batteries, a total power overcurrent circuit, and a management system. The multiple batteries are connected in series to the total power overcurrent circuit via multiple busbars, and the busbars connect the positive and negative terminals of two adjacent batteries. The battery device also includes a data acquisition branch, a first thermistor, and a current acquisition element. The data acquisition branch connects the positive and negative terminals of two adjacent batteries and is connected in parallel with the busbars. The first thermistor is disposed in the data acquisition branch, and multiple first thermistors are arranged corresponding to multiple batteries. The first thermistors are made of PTC material. The current acquisition element is disposed in the total power overcurrent circuit or the data acquisition branch and is used to acquire current information. The management system is connected to the current acquisition element and is used to determine whether there is an abnormal temperature rise in the battery based on the current information acquired by the current acquisition element.

Description

Technical Field

[0001] This disclosure relates to the field of automotive power battery technology, and more particularly to a battery device and a vehicle. Background Technology

[0002] In existing battery device designs, NTC thermistor-based acquisition schemes are commonly used to collect battery temperature information. However, current battery devices face numerous challenges in areas such as trolleybus temperature monitoring and alarms, including poor sensitivity and accuracy. These issues represent a major area of ​​current research in this field. Summary of the Invention

[0003] To overcome the problems existing in the related technologies, this disclosure provides a battery device and a vehicle.

[0004] According to a first aspect of the present disclosure, a battery device is provided, including a plurality of batteries, a total power overcurrent circuit, and a management system; the plurality of batteries are connected in series to the total power overcurrent circuit via a plurality of busbars, the busbars connecting the positive and negative terminals of two adjacent batteries; the battery device further includes a data acquisition branch, a first thermistor, and a current acquisition element; the data acquisition branch connects the positive and negative terminals of two adjacent batteries and is connected in parallel with the busbars; the first thermistor is disposed in the data acquisition branch, and a plurality of the first thermistors are arranged corresponding to the plurality of batteries, the first thermistors being made of PTC material; the current acquisition element is disposed in the total power overcurrent circuit or the data acquisition branch, and is used to acquire current information; wherein, the management system is connected to the current acquisition element and is used to determine whether the battery has an abnormal temperature rise based on the current information acquired by the current acquisition element.

[0005] In some exemplary embodiments of this disclosure, the first thermistor is disposed on the busbar, the first thermistor uses its own structure as the acquisition branch, and is connected to the battery terminal via the busbar; the current acquisition element is disposed in the total power overcurrent circuit.

[0006] In some exemplary embodiments of this disclosure, a groove is provided on one side surface of the bus, and the first thermistor is accommodated in the groove.

[0007] In some exemplary embodiments of this disclosure, the busbar has two ends respectively connected to the pole post, and the groove is located between the two ends.

[0008] In some exemplary embodiments of this disclosure, the first thermistor is stacked on top of the busbar.

[0009] In some exemplary embodiments of this disclosure, the bus includes two conductive layers, and the first thermistor is disposed between the two conductive layers.

[0010] In some exemplary embodiments of this disclosure, the area on the bus where the first thermistor is disposed is a first region, and the current-carrying area of ​​the first thermistor accounts for 5% to 40% of the current-carrying area of ​​the first region.

[0011] In some exemplary embodiments of this disclosure, the first thermistor and the busbar are combined using a vacuum hot-pressing sintering process.

[0012] In some exemplary embodiments of this disclosure, all of the busbars are provided with the first thermistor; or, in any two busbars connected to the battery, one is provided with the first thermistor, while the other is not provided with the first thermistor.

[0013] In some exemplary embodiments of this disclosure, the first thermistor is connected via the acquisition branch to a positive terminal and a negative terminal connected by a bus, and the first thermistor is disposed on the surface of the battery casing; the current acquisition element is disposed on the acquisition branch.

[0014] In some exemplary embodiments of this disclosure, a plurality of first thermistors are respectively disposed on the casing surface of a plurality of batteries, and the plurality of first thermistors are respectively connected to a plurality of acquisition branches, each acquisition branch being provided with a current acquisition element; wherein: the plurality of acquisition branches are respectively connected to positive and negative terminals connected to different busbars; or, at least two acquisition branches are respectively connected to positive and negative terminals connected to the same busbar; or, all acquisition branches are respectively connected to positive and negative terminals connected to the same busbar.

[0015] In some exemplary embodiments of this disclosure, a plurality of first thermistors are respectively disposed on the casing surface of a plurality of batteries, at least two first thermistors are disposed in the same acquisition branch and connected in series by the acquisition branch, and the acquisition branch is provided with a current acquisition element.

[0016] In some exemplary embodiments of this disclosure, all the first thermistors are disposed in the same acquisition branch.

[0017] In some exemplary embodiments of this disclosure, the current acquisition element is a Hall sensor.

[0018] In some exemplary embodiments of this disclosure, the battery device further includes a temperature acquisition structure; the temperature acquisition structure includes an acquisition trunk line and acquisition branches, the acquisition trunk line is connected to the management system, the acquisition branches are connected to the acquisition trunk line, and the acquisition branches are provided with a second thermistor, the second thermistor being made of NTC material, and the second thermistor being disposed on the surface of the battery casing.

[0019] According to a second aspect of the present disclosure, a vehicle is provided, wherein the vehicle includes the battery device proposed in the present disclosure and described in the above embodiments.

[0020] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: The battery device proposed in this disclosure includes a data acquisition branch, a first thermistor, and a current acquisition element; the data acquisition branch connects the positive and negative terminals of two adjacent batteries and is connected in parallel with the busbar; the first thermistor is disposed in the data acquisition branch, and multiple first thermistors correspond to multiple battery arrangements, the first thermistors being made of PTC material; the current acquisition element is disposed in the total power overcurrent circuit or the data acquisition branch, so that the management system can determine whether there is an abnormal temperature rise in the battery based on the current information collected by the current acquisition element. Through the above structural design, this disclosure uses the first thermistor to achieve full coverage monitoring of all batteries. When any battery overheats, the first thermistor corresponding to that battery will generate a sudden increase in resistance as the battery temperature rises until it exceeds the Curie temperature of the PTC material, thereby significantly reducing the current flowing through it. The current acquisition element disposed in the total power overcurrent circuit or the data acquisition branch can immediately capture the signal of this current change, thereby allowing the management system to make a judgment and trigger a temperature warning. Accordingly, this disclosure enables rapid transmission of electrical signals characterizing temperature rise and significantly improves temperature warning response speed, thereby optimizing the accuracy and sensitivity of battery devices in thermal management and monitoring of batteries.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0023] Figure 1 This is a perspective view of a battery device according to an exemplary embodiment of the present disclosure;

[0024] Figure 2 yes Figure 1 A plan view of the battery device is shown;

[0025] Figure 3 yes Figure 1 A simplified system diagram of the battery device is shown.

[0026] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the busbar is shown;

[0027] Figure 5 yes Figure 4 A schematic diagram of the cross-section of the busbar is shown;

[0028] Figure 6 This is a perspective view of the busbar of a battery device according to another exemplary embodiment of the present disclosure;

[0029] Figure 7 and Figure 8 These are exploded perspective views of the busbars of a battery device illustrated according to several other exemplary embodiments of the present disclosure;

[0030] Figure 9 This is a plan view of a battery device according to another exemplary embodiment of the present disclosure;

[0031] Figure 10 yes Figure 9 A simplified system diagram of the battery device is shown.

[0032] Figures 11 to 13 These are simplified schematic diagrams of battery devices illustrated according to several other exemplary embodiments of the present disclosure;

[0033] Figure 14 This is a block diagram of a vehicle illustrated according to some exemplary embodiments of the present disclosure.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Battery housing;

[0036] 200. Battery;

[0037] 210. Busbar;

[0038] 211. Groove;

[0039] 212. Conductive layer;

[0040] 300. Collection branch;

[0041] 310. First thermistor;

[0042] 400. Current acquisition element;

[0043] 500. Temperature acquisition structure;

[0044] 510. Data collection trunk line;

[0045] 520. Data acquisition branch;

[0046] 600. Vehicles;

[0047] 610. Infotainment system;

[0048] 620. Sensing system;

[0049] 630. Decision control system;

[0050] 640. Drive system;

[0051] 650. Computing platform;

[0052] 651. Processor;

[0053] 652. Memory;

[0054] 653. Instructions;

[0055] S1. First area. Detailed Implementation

[0056] Some embodiments of this disclosure will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. Various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but can be changed as will become apparent upon understanding this disclosure, except for operations that must be performed in a particular order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0057] The embodiments described in the following examples of this disclosure are not representative of all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0058] See Figure 1 The illustration shows a three-dimensional schematic diagram of the battery device proposed in this disclosure. In this exemplary embodiment, the battery device proposed in this disclosure is described using an on-board power battery 200 as an example. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to apply the relevant designs of this disclosure to other types of battery devices, and these changes are still within the scope of the principles of the battery device proposed in this disclosure.

[0059] like Figure 1As shown, in one embodiment of this disclosure, the battery device proposed in this disclosure includes a plurality of batteries 200, a total power overcurrent circuit (e.g., a high-voltage main line), and a management system (e.g., a BMS). See also... Figures 2 to 5 , Figure 2 A schematic plan view of the battery device is shown in the figure. Figure 3 A simplified system diagram of the battery device is shown in the image. Figure 4 A three-dimensional schematic diagram of busbar 210 is shown in the figure. Figure 5 A representative cross-sectional schematic diagram of busbar 210 is shown in the figure. The structure, connection method, and functional relationship of the main components of the battery device proposed in this disclosure will be described in detail below with reference to the above figures.

[0060] like Figures 1 to 3 As shown, in one embodiment of this disclosure, multiple batteries 200 are connected in series and connected to a total power overcurrent circuit via multiple busbars 210. Each busbar 210 connects the positive and negative terminals of two adjacent batteries 200. The battery device proposed in this disclosure also includes a data acquisition branch 300, a first thermistor 310, and a current acquisition element 400. The data acquisition branch 300 connects the positive and negative terminals of two adjacent batteries 200, and is connected in parallel with the busbars 210. That is, the data acquisition branch 300 connects the positive and negative terminals of two adjacent batteries 200 connected by the same busbar 210. Accordingly, the data acquisition branch 300 and the first thermistor 310 participate in current conduction in everyday operating scenarios (e.g., when the first thermistor 310 has not reached its Curie temperature). A first thermistor 310 is disposed in the data acquisition branch 300, and multiple first thermistors 310 are arranged corresponding to multiple batteries 200, and the first thermistors 310 are made of PTC material. Figures 1 to 3Taking the illustrated structure as an example, for the busbar 210 connected between the positive and negative terminals of two adjacent batteries 200, each busbar 210 is correspondingly arranged with a corresponding parallel acquisition branch 300, that is, each busbar 210 is correspondingly arranged with a first thermistor 310. Accordingly, the acquisition branches 300 are in series and are connected as a whole to the power overcurrent circuit. When any first thermistor 310 heats up to above the Curie temperature along with the adjacent battery 200, the resistance suddenly increases, which will affect the above-mentioned series-connected circuit, the current will decrease significantly, and the current will bypass (i.e., busbar 210). At this time, the current acquisition element 400 set in the total power overcurrent circuit or the acquisition branch 300 can immediately capture the signal, realizing real-time acquisition of current information. On this basis, the management system is connected to the current acquisition element 400 to determine whether there is an abnormal temperature rise in the battery 200 based on the current information acquired by the current acquisition element 400. Through the above structural design, this disclosure utilizes a first thermistor 310 to achieve full-coverage monitoring of all batteries 200. When any battery 200 overheats, the first thermistor 310 corresponding to that battery 200 experiences a sudden increase in resistance as the battery 200 heats up until it exceeds the Curie temperature of the PTC material. This significantly reduces the current flowing through the battery. The current acquisition element 400, located in the main power overcurrent circuit or the acquisition branch 300, can immediately capture this current change signal, allowing the management system to make a judgment and trigger a temperature warning. Accordingly, this disclosure enables rapid transmission of electrical signals characterizing the heating phenomenon and significantly improves the temperature warning response speed, optimizing the accuracy and sensitivity of the battery device in thermal management and monitoring of the batteries 200.

[0061] Specifically, in existing NTC thermistor-based data acquisition schemes, the NTC thermistors use NTC material, i.e., negative coefficient thermistor material, whose resistance decreases as temperature increases. This characterizes the battery's temperature information, allowing the battery device's management system to determine whether temperature anomalies or thermal runaway have occurred. However, in existing schemes, NTC thermistors are only installed on the surface of a small number of battery casings. For batteries without NTC thermistors, temperature monitoring is achieved indirectly through heat transfer from other batteries and structures, resulting in acquisition delays and affecting the accuracy and sensitivity of the management system's thermal management and monitoring of the batteries. Furthermore, even considering batteries with NTC thermistors, since the NTC thermistors are only located on one side of the casing surface (e.g., the top surface), if the battery experiences a temperature rise in an area far from that side, it still takes a considerable amount of time for the temperature to be transmitted to the side with the NTC thermistor, also leading to acquisition delays and affecting the accuracy and sensitivity of the management system's thermal management and monitoring of the batteries. In contrast, this disclosure uses PTC material as the material for the first thermistor 310. Based on the material properties of PTC, the first thermistor 310 has a low resistance under normal conditions (e.g., less than or equal to 0.1 mΩ·cm), and its resistance increases abruptly (e.g., by 1000 times or more) when its temperature rises to a strain threshold (i.e., the Curie temperature). Therefore, for the first thermistor 310 using PTC material, this disclosure eliminates the need for high-precision temperature sensing devices or high-precision current sensing devices. This disclosure utilizes the first thermistor 310 to simplify the temperature monitoring judgment signal of the management system to "0" and "1," that is, the management system instantly determines whether to trigger a temperature warning based on whether the current acquisition element 400 captures the signal of the current change as "yes" or "no."

[0062] like Figure 1 , Figure 2 and Figure 4As shown, in one embodiment of this disclosure, the first thermistor 310 can be disposed on the busbar 210. The first thermistor 310 uses its own structure as the acquisition branch 300, and the first thermistor 310 is connected to the terminal of the battery 200 via the busbar 210. Furthermore, the current acquisition element 400 can be disposed in the main power overcurrent circuit. Through the above structural design, this disclosure utilizes the busbar 210 to connect the first thermistor 310 (i.e., the acquisition branch 300) to the electrode of the battery 200. At this time, the first thermistor 310 mainly reflects the temperature of the battery 200 in the electrode region, ensuring that the heat conduction path between the battery 200 and the first thermistor 310 is controllable. Furthermore, this disclosure provides a busbar 210 with a composite structure having a first thermistor 310. The first thermistor 310 does not completely replace the busbar 210 for overcurrent in a specific region along its extension direction. That is, when the first thermistor 310 heats up to the Curie temperature and experiences a sudden increase in resistance, the portion of the busbar 210 corresponding to the first thermistor 310 (e.g., the first region S1 described below) can still perform the overcurrent function. In other words, the first thermistor 310 is not used as a short-circuit protection structure (circuit breaker, fuse). Based on this, this disclosure eliminates the need for additional data acquisition branches 300, reducing wiring in the battery device, lowering structural complexity, simplifying assembly manufacturing processes, and reducing material costs.

[0063] like Figure 4 As shown, based on the structural design of the first thermistor 310 disposed on the busbar 210, in one embodiment of this disclosure, a groove 211 can be provided on one side surface of the busbar 210 (e.g., the side surface facing away from the battery 200), and the first thermistor 310 is accommodated in the groove 211. Through the above structural design, this disclosure utilizes the groove 211 provided on the busbar 210 to arrange the first thermistor 310, which can improve the bonding strength between the busbar 210 and the first thermistor 310, and help reduce the assembly difficulty.

[0064] like Figure 4 As shown, based on the structural design of the first thermistor 310 disposed in the groove 211, in one embodiment of this disclosure, the busbar 210 has two ends respectively connected to the terminals, and the groove 211 can be located between the two ends. Through the above structural design, this disclosure can stagger the arrangement of the first thermistor 310 and the two ends of the busbar 210, thereby avoiding the first thermistor 310 from affecting the fixed assembly process (e.g., welding process) of the two ends and the battery 200 terminals.

[0065] like Figure 4As shown, in one embodiment of this disclosure, the groove 211 can be a through-groove structure that extends laterally through the busbar 210. The term "lateral" can be understood as another direction perpendicular to the extension direction of the busbar 210.

[0066] See Figure 6 , Figure 6 The diagram shows a three-dimensional schematic of a busbar 210 in another embodiment of a battery device that embodies the principles of this disclosure.

[0067] like Figure 6 As shown, in one embodiment of this disclosure, the groove 211 can be a sinking structure with a closed groove wall.

[0068] See Figure 7 , Figure 7 The diagram shows a representative exploded perspective view of the busbar 210 in another embodiment of the battery device that embodies the principles of this disclosure.

[0069] like Figure 7 As shown, in one embodiment of this disclosure, the first thermistor 310 and the bus 210 can be stacked on top of each other. For example, the bus 210 is stacked on the side of the bus 210 facing away from the battery 200.

[0070] See Figure 8 , Figure 8 The diagram shows a representative exploded perspective view of the busbar 210 in another embodiment of the battery device that embodies the principles of this disclosure.

[0071] like Figure 8 As shown, in one embodiment of this disclosure, the bus 210 may include two conductive layers 212 (e.g., copper foil), and the first thermistor 310 is disposed between the two conductive layers 212. That is, the combined structure of the bus 210 and the first thermistor 310 can be a stacked structure of "conductive layer 212 - first thermistor 310 - conductive layer 212". Specifically, taking copper foil as an example, the thickness of the copper foil can be 1.5 mm, and the thickness of the first thermistor 310 can be 0.2 mm.

[0072] Based on the structural design of the first thermistor 310 disposed on the bus 210, in one embodiment of this disclosure, the area on the bus 210 where the first thermistor 310 is disposed is a first region S1. The proportion of the current-carrying area of ​​the first thermistor 310 in the current-carrying area of ​​the first region S1 can be 5% to 40%, for example, 5%, 7%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, etc. Specifically, with Figure 4 and Figure 5Taking the illustrated structure as an example, in the first region S1 of the busbar 210, the ratio of the thickness of the first thermistor 310 to the thickness of the first region S1 can be understood as the proportion of the aforementioned current-carrying area. For example, if the proportion of the current-carrying area of ​​the first thermistor 310 in the current-carrying area of ​​the first region S1 is 30%, then the ratio of the thickness of the first thermistor 310 to the thickness of the first region S1 is 3:10. That is, for the structural design in which the first thermistor 310 is disposed in the groove 211, the ratio of the thickness of the first thermistor 310 to the overall thickness of the busbar 210 is 3:13. Through the above structural design, the smaller the proportion of the current-carrying area of ​​the first thermistor 310, the less current it shuns to the busbar 210 under normal conditions, and the less significant its influence on the current when the Curie temperature is reached. Furthermore, a larger proportion of the current-carrying area of ​​the first thermistor 310 means a smaller normal current-carrying area of ​​the busbar 210 in the first region S1, affecting the current-carrying capacity of the busbar 210. Therefore, this disclosure avoids the first thermistor 310 having an excessively small proportion of its current-carrying area, ensuring the accuracy and sensitivity of the temperature monitoring function. Simultaneously, this disclosure avoids the first thermistor 310 having an excessively large proportion of its current-carrying area, ensuring the normal current-carrying capacity of the busbar 210. In other embodiments of this disclosure, the proportion of the current-carrying area of ​​the first thermistor 310 in the current-carrying area of ​​the first region S1 may be less than 5% or greater than 40%, for example, 3%, 3.5%, 4%, 4.5%, 4.9%, 40.5%, 41%, 45%, 50%, etc., and is not limited to this embodiment.

[0073] Based on the structural design of the first thermistor 310 disposed on the bus 210, in one embodiment of this disclosure, the amount of current in which the first thermistor 310 participates in the total overcurrent does not exceed 50%, and further, does not exceed 20%. The amount of current in which the first thermistor 310 participates in the total overcurrent can be estimated by the "resistivity × cross-sectional area" of the cross-section.

[0074] Based on the structural design of the first thermistor 310 disposed on the bus 210, in one embodiment of this disclosure, the first thermistor 310 and the bus 210 can be combined using a vacuum hot-pressing sintering process. Through the above design, this disclosure achieves a low-resistance connection between the first thermistor 310 and the bus 210. In other embodiments of this disclosure, the bus 210 and the first thermistor 310 can also be combined using other interface optimization processes such as gradient material composites, and are not limited to this embodiment.

[0075] like Figure 1 and Figure 2As shown, based on the structural design of the first thermistor 310 being disposed on the bus 210, in one embodiment of this disclosure, all bus 210s may be respectively provided with the first thermistor 310. Through the above structural design, this disclosure can achieve the coverage of the temperature monitoring function of the first thermistor 310 for all batteries 200, further improving the accuracy and sensitivity of the temperature monitoring function.

[0076] See Figure 9 and Figure 10 , Figure 9 The diagram shows a schematic plan view of a battery device that embodies the principles of this disclosure in another embodiment. Figure 10 China representatively shows Figure 9 A simplified system diagram of the battery device is shown.

[0077] like Figure 9 and Figure 10 As shown, taking the first thermistor 310 disposed on the busbar 210 as an example, in one embodiment of this disclosure, for any two busbars 210 connected to any battery 200, only one of them may be provided with the first thermistor 310, while the other may not be provided with the first thermistor 310. Accordingly, for any battery 200, the temperature information of its terminal region is mainly monitored by one first thermistor 310. That is, for some adjacent batteries 200, the temperature information of the two adjacent batteries 200 is monitored by the same first thermistor 310, while for other adjacent batteries 200, the temperature information of the two adjacent batteries 200 is monitored by two first thermistors 310 respectively. Through the above structural design, this disclosure can still achieve the coverage of the temperature monitoring function of the first thermistor 310 for all batteries 200, and on this basis, reduce the number of first thermistors 310, reduce material costs, and reduce the processing costs of modifying some busbars 210 to accommodate the first thermistor 310.

[0078] See Figure 11 , Figure 11 The diagram shown is a simplified system diagram of a battery device that embodies the principles of this disclosure in another embodiment.

[0079] like Figure 11 As shown, in one embodiment of this disclosure, the first thermistor 310 can be connected via a data acquisition branch 300 to the positive and negative terminals connected by a bus 210, and the first thermistor 310 can be disposed on the surface of the battery casing 200, that is, the first thermistor 310 mainly monitors the temperature of the battery casing 200. Based on this, a current acquisition element 400 is disposed in the data acquisition branch 300. Figures 1 to 3 or Figure 9 Compared to the implementation shown, Figure 11 The illustrated embodiment employs an additional data acquisition branch 300, specifically utilizing a wiring harness to arrange the first thermistor 310. Of course, this data acquisition branch 300 maintains its parallel connection with the bus 210. Through this structural design, the present disclosure facilitates the maintenance and replacement of the first thermistor 310. For example, when an individual first thermistor 310 fails and needs replacement, it can be removed from its associated data acquisition branch 300, or the entire data acquisition branch 300 can be removed without affecting the bus 210. This improves maintenance convenience, increases maintenance efficiency, and reduces maintenance costs.

[0080] like Figure 11 As shown, in one embodiment of this disclosure, a plurality of first thermistors 310 are respectively disposed on the surface of the casings of a plurality of batteries 200. The plurality of first thermistors 310 are respectively connected to a plurality of acquisition branches 300, and each acquisition branch 300 is provided with a current acquisition element 400. Based on this, the plurality of acquisition branches 300 are respectively connected to positive and negative terminals connected by different busbars 210. In other words, for any two acquisition branches 300, the battery 200 terminals (or the corresponding busbars 210) they are connected to are different. Through the above structural design, this disclosure facilitates the acquisition branches 300 to connect the first thermistors 310 to the battery 200 terminals nearby, thereby simplifying the wiring length of each acquisition branch 300. For example, for a battery 200 with a first thermistor 310 on its casing surface, one end of the acquisition branch 300 connected to the first thermistor 310 is connected to the positive terminal (or negative terminal) of the battery 200, and the other end of the acquisition branch 300 is connected to the negative terminal (or positive terminal) of another battery 200 adjacent to the battery 200.

[0081] In another embodiment not illustrated in this disclosure, a plurality of first thermistors 310 are respectively disposed on the surface of the casings of a plurality of batteries 200. The plurality of first thermistors 310 are respectively connected to a plurality of acquisition branches 300, and each acquisition branch 300 is respectively provided with a current acquisition element 400. Based on this, at least two acquisition branches 300 can be respectively connected to the positive terminal and the negative terminal connected to the same busbar 210. Alternatively, all acquisition branches 300 can be respectively connected to the positive terminal and the negative terminal connected to the same busbar 210.

[0082] See Figure 12 , Figure 12 The diagram shown is a simplified system diagram of a battery device that embodies the principles of this disclosure in another embodiment.

[0083] like Figure 12As shown, taking the structural design of arranging the first thermistor 310 using a specific wiring harness as an example, in one embodiment of this disclosure, multiple first thermistors 310 are respectively disposed on the surface of the casing of multiple batteries 200. At least two first thermistors 310 can be disposed in the same acquisition branch 300, that is, at least two first thermistors 310 are connected in series via the acquisition branch 300, and the acquisition branch 300 is provided with a current acquisition element 400. Through the above structural design, this disclosure can reduce the number of acquisition branches 300, thereby reducing the number of current acquisition elements 400, thereby reducing the wiring complexity of the battery device, reducing the number of components, and reducing costs.

[0084] See Figure 13 , Figure 13 The diagram shown is a simplified system diagram of a battery device that embodies the principles of this disclosure in another embodiment.

[0085] like Figure 13 As shown, taking the structural design of arranging the first thermistor 310 using a specific wiring harness as an example, in one embodiment of this disclosure, all the first thermistors 310 can be arranged in the same acquisition branch 300. Through the above structural design, this disclosure can realize the arrangement and connection of all the first thermistors 310 using only one specific acquisition branch 300, thereby requiring only one current acquisition element 400, thereby further reducing the wiring complexity of the battery device, further reducing the number of components, and further reducing costs.

[0086] In one embodiment of this disclosure, the current acquisition element 400 can be a Hall sensor. Taking the Hall sensor installed in the power overcurrent circuit as an example, the Hall sensor is used to monitor the main line current. When the main line current deviates downward from the expected value, it indicates that the first thermistor 310 has heated up to the Curie temperature, which can be used by the management system to determine that the battery 200 has abnormally heated up or thermal runaway, and thus issue an early warning.

[0087] like Figure 1 , Figure 2 or Figure 9 As shown, in one embodiment of this disclosure, the battery device proposed in this disclosure may further include a temperature acquisition structure 500. Specifically, the temperature acquisition structure 500 includes an acquisition trunk line 510 and an acquisition branch line 520. The acquisition trunk line 510 is connected to the management system, and the acquisition branch line 520 is connected to the acquisition trunk line 510. The acquisition branch line 520 is provided with a second thermistor, which may be made of NTC material, and the second thermistor is disposed on the surface of the battery 200 casing. For example, the second thermistor may be disposed on the surface of the battery 200 casing where the terminals are located, and arranged at intervals from the terminals, that is, at intervals from the busbar 210. The arrangement position of the second thermistor can be understood with reference to the end position of the acquisition branch line 520 in the accompanying drawings.

[0088] It should be noted that the battery devices shown in the accompanying drawings and described in this specification are merely a few examples among many battery devices capable of employing the principles of this disclosure. It should be clearly understood that the principles of this disclosure are by no means limited to any detail or component of the battery devices shown in the accompanying drawings or described in this specification.

[0089] For example, such as Figure 1 , Figure 2 or Figure 9 As shown, the battery device proposed in this disclosure includes a battery housing 100, and a battery 200 is disposed in the battery housing 100. In addition, for ease of observation and understanding, some structures of the battery device, such as the cover plate, management system, and total power overcurrent circuit, are omitted in the above figures.

[0090] For example, the formulation of the PTC material used in the first thermistor 310 can be: barium titanate (BaTiO3) as the matrix, doped with rare earth elements (such as Y3). + The Curie temperature can be precisely controlled to 90±2℃ using a glass phase (SiO2-B2O3). Furthermore, the steepness of the abrupt change of the first thermistor 310 can be optimized through nanoscale grain boundary engineering (grain size of 50nm~200nm), controlling the response time to less than 3 seconds (from triggering to resistance saturation).

[0091] For example, the first thermistor 310 can be prepared by screen printing PTC paste onto a copper substrate, sintering it at 850°C in a nitrogen atmosphere to form a dense layer, and then electroplating a nickel layer (e.g., 2μm thick) to provide anti-oxidation function. Alternatively, a double copper busbar pressing process can be used directly.

[0092] Based on the above detailed description of several exemplary embodiments of the battery device proposed in this disclosure, an exemplary embodiment of the vehicle proposed in this disclosure will be described below.

[0093] In one embodiment of this disclosure, the vehicle proposed in this disclosure includes the battery device proposed in this disclosure and described in detail in the above embodiments.

[0094] Figure 14 This is a block diagram illustrating a vehicle 600 according to an exemplary embodiment. For example, vehicle 600 may be a hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicle. Vehicle 600 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0095] Reference Figure 14The vehicle 600 may include various subsystems, such as an infotainment system 610, a perception system 620, a decision control system 630, a drive system 640, and a computing platform 650. The vehicle 600 may also include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and each component of the vehicle 600 can be interconnected via wired or wireless means.

[0096] In some embodiments, the infotainment system 610 may include a communication system, an entertainment system, and a navigation system, etc.

[0097] The perception system 620 may include several sensors for sensing information about the environment surrounding the vehicle 600. For example, the perception system 620 may include a global positioning system (which may be GPS, BeiDou, or other positioning systems), an inertial measurement unit (IMU), lidar, millimeter-wave radar, ultrasonic radar, and a camera device.

[0098] The decision control system 630 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0099] The drive system 640 may include components that provide powered motion to the vehicle 600. In one embodiment, the drive system 640 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of internal combustion engines, electric motors, and compressed air engines. The engine is capable of converting energy provided by the energy source into mechanical energy. The energy source may include the battery device proposed in this disclosure.

[0100] Some or all of the functions of vehicle 600 are controlled by computing platform 650. Computing platform 650 may include at least one processor 651 and memory 652, processor 651 can execute instructions 653 stored in memory 652.

[0101] Processor 651 can be any conventional processor, such as a commercially available CPU. The processor may also include, for example, a Graphics Processing Unit (GPU), a Field Programmable Gate Array (FPGA), a System on Chip (SOC), an Application Specific Integrated Circuit (ASIC), or a combination thereof.

[0102] The memory 652 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0103] In addition to instruction 653, memory 652 can also store data, such as road maps, route information, vehicle position, direction, speed, and other data. The data stored in memory 652 can be used by computing platform 650.

[0104] It should be noted that the vehicles shown in the accompanying drawings and described in this specification are merely a few examples among many vehicles capable of employing the principles of this disclosure. It should be clearly understood that the principles of this disclosure are by no means limited to any detail or component of the vehicles shown in the accompanying drawings or described in this specification.

[0105] In summary, the battery device proposed in this disclosure includes a data acquisition branch 300, a first thermistor 310, and a current acquisition element 400. The data acquisition branch 300 connects the positive and negative terminals of two adjacent batteries 200 and is connected in parallel with the busbar 210. The first thermistor 310 is disposed in the data acquisition branch 300, and multiple first thermistors 310 are arranged corresponding to multiple batteries 200 respectively. The first thermistor 310 is made of PTC material. The current acquisition element 400 is disposed in the main power overcurrent circuit or the data acquisition branch 300 so that the management system can determine whether there is an abnormal temperature rise in the battery 200 based on the current information acquired by the current acquisition element 400. Through the above structural design, this disclosure utilizes a first thermistor 310 to achieve full-coverage monitoring of all batteries 200. When any battery 200 overheats, the first thermistor 310 corresponding to that battery 200 experiences a sudden increase in resistance as the battery 200 heats up until it exceeds the Curie temperature of the PTC material. This significantly reduces the current flowing through the battery. The current acquisition element 400, located in the main power overcurrent circuit or the acquisition branch 300, can immediately capture this current change signal, allowing the management system to make a judgment and trigger a temperature warning. Accordingly, this disclosure enables rapid transmission of electrical signals characterizing the heating phenomenon and significantly improves the temperature warning response speed, optimizing the accuracy and sensitivity of the battery device in thermal management and monitoring of the batteries 200.

[0106] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0107] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding the specification and drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0108] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0109] It should be understood that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., used in the embodiments of this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms herein according to the specific circumstances.

[0110] Although terms such as “first” and “second” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, part, region, layer, or section mentioned in the examples may also be referred to as the second component, part, region, layer, or section. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include at least one of that feature. In the description herein, “a plurality” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0111] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0112] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery device, characterized by, The battery assembly includes multiple batteries (200), a total power overcurrent circuit, and a management system; the multiple batteries (200) are connected in series to the total power overcurrent circuit via multiple busbars (210), the busbars (210) connecting the positive and negative terminals of two adjacent batteries (200); the battery assembly further includes: A collection branch (300) connects the positive and negative terminals of two adjacent batteries (200) and is connected in parallel with the busbar (210); A first thermistor (310) is disposed in the acquisition branch (300), and multiple first thermistors (310) are arranged corresponding to multiple batteries (200). The first thermistor (310) is made of PTC material. A current acquisition element (400) is disposed in the total power overcurrent circuit or the acquisition branch (300) for acquiring current information; The management system is connected to the current acquisition element (400) and is used to determine whether the battery (200) has an abnormal temperature rise based on the current information acquired by the current acquisition element (400).

2. The battery device according to claim 1, characterized by The first thermistor (310) is disposed on the busbar (210). The first thermistor (310) uses its own structure as the acquisition branch (300) and is connected to the terminal of the battery (200) via the busbar (210). The current acquisition element (400) is disposed in the total power overcurrent circuit.

3. The battery device of claim 2, wherein, A groove (211) is provided on one side surface of the bus (210), and the first thermistor (310) is accommodated in the groove (211).

4. The battery device of claim 3, wherein The busbar (210) has two ends that are respectively connected to the pole post, and the groove (211) is located between the two ends.

5. The battery device of claim 2, wherein The first thermistor (310) and the bus (210) are stacked on top of each other.

6. The battery device of claim 5, wherein, The bus (210) includes two conductive layers (212), and the first thermistor (310) is disposed between the two conductive layers (212).

7. The battery device of claim 2, wherein The area on the busbar (210) where the first thermistor (310) is located is the first region (S1), and the proportion of the current-carrying area of ​​the first thermistor (310) in the current-carrying area of ​​the first region (S1) is 5% to 40%.

8. The battery device of claim 2, wherein The first thermistor (310) and the busbar (210) are combined using a vacuum hot pressing sintering process.

9. The battery device according to any one of claims 2 to 8, characterized in that: All of the busbars (210) are respectively provided with the first thermistor (310); or Of the two busbars (210) to which any of the batteries (200) are connected, one is provided with the first thermistor (310), and the other is not provided with the first thermistor (310).

10. The battery device of claim 1, wherein, The first thermistor (310) is connected to the positive and negative terminals connected by a bus (210) via the acquisition branch (300), and the first thermistor (310) is disposed on the surface of the battery (200) casing; the current acquisition element (400) is disposed on the acquisition branch (300).

11. The battery device of claim 10, wherein, Multiple first thermistors (310) are respectively disposed on the casing surfaces of multiple batteries (200), and the multiple first thermistors (310) are respectively connected to multiple acquisition branches (300), each acquisition branch (300) is respectively provided with a current acquisition element (400); wherein: Multiple acquisition branches (300) are respectively connected to positive and negative terminals connected by different busbars (210); or At least two of the said acquisition branches (300) are respectively connected to the positive terminal and the negative terminal connected by the same bus (210); or All of the acquisition branches (300) are respectively connected to the positive and negative terminals connected by the same busbar (210).

12. The battery device of claim 10, wherein, Multiple first thermistors (310) are respectively disposed on the housing surface of multiple batteries (200), and at least two first thermistors (310) are disposed in the same acquisition branch (300) and connected in series by the acquisition branch (300). The acquisition branch (300) is provided with a current acquisition element (400).

13. The battery device according to claim 12, characterized in that, All of the first thermistors (310) are located in the same acquisition branch (300).

14. The battery device of claim 1, wherein, The current acquisition element (400) is a Hall sensor.

15. The battery device of claim 1, wherein, The battery device also includes: Temperature acquisition structure (500) includes acquisition trunk line (510) and acquisition branch line (520). Acquisition trunk line (510) is connected to the management system. Acquisition branch line (520) is connected to acquisition trunk line (510). Acquisition branch line (520) is provided with a second thermistor. The second thermistor is made of NTC material and is disposed on the surface of the casing of the battery (200).

16. A vehicle characterized by comprising: The vehicle includes the battery device according to any one of claims 1 to 15.

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