Battery systems and vehicles

Abstract

The present application provides a battery system and a vehicle, which relate to the field of energy storage technology. The battery system includes at least two series circuits, a battery disconnector, a plurality of temperature sensors and a battery management system. Each series circuit includes a plurality of battery cells connected in series; the corresponding battery cells in at least two series circuits are connected in parallel through gold wires; the battery disconnect unit is electrically connected to at least two series circuits, and a plurality of temperature sensors are arranged corresponding to a plurality of battery cells; the battery management system is electrically connected to a plurality of temperature sensors and a battery disconnector; the battery management system determines the abnormal battery cell according to the detection result of each temperature sensor; the battery management system controls the battery disconnector to cut off the series circuit where the abnormal battery cell is located; and uses the voltage difference formed between the abnormal battery cell and the battery cell connected in parallel to melt the gold wire. The present application can cut off the battery cell that has thermal runaway at any time to ensure the safety of the vehicle's drivers and passengers.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy storage technology, and in particular, to a battery system and a vehicle. Background Art

[0002] The battery system is the most important component in a vehicle. For example, the battery is the most important component in the power system of a new energy electric vehicle, and it is crucial to ensure the safety of the power battery system.

[0003] At present, the requirements for battery power are getting higher and higher, and higher requirements are put forward for battery safety, reliability and consistency. In particular, thermal runaway protection of battery systems has become one of the key technologies for the development of the industry. However, when the battery cells in the battery system thermally runaway, the external high-voltage power supply will be immediately disconnected. At this time, if the vehicle is in a driving state, it will immediately lose power, which brings huge risks to the life and property safety of the driver and passengers, and has poor safety. Utility Model Content

[0004] In view of the above problems, the embodiments of the present application provide a battery system and a vehicle, which can not only cut off the battery cells that have thermal runaway at any time, but also ensure the safety of the vehicle's drivers and passengers.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a battery system, comprising: at least two series circuits, each of which is formed by connecting a plurality of battery cells in series; corresponding battery cells in at least two of the series circuits are connected in parallel via gold wires;

[0007] A battery disconnector, wherein the battery disconnect unit is electrically connected to at least two of the series circuits;

[0008] A plurality of temperature sensors, wherein the plurality of temperature sensors are arranged corresponding to the plurality of battery cells and are used to detect the temperatures of the corresponding battery cells;

[0009] A battery management system, wherein the battery management system is electrically connected to the plurality of temperature sensors and the battery disconnector; the battery management system is used to determine the abnormal battery cell according to the detection result of each temperature sensor; the battery management system also controls the battery disconnector to cut off the series circuit where the abnormal battery cell is located;

[0010] Wherein, a voltage difference is formed between the abnormal battery cell and the battery cell connected in parallel therewith, and the voltage difference is used to fuse the gold wire.

[0011] In a possible implementation, at least two of the series circuits include a first series circuit and a second series circuit; the battery disconnector includes a first interface, a second interface, a third interface and a fourth interface;

[0012] The first interface is connected to the first series loop through a first connecting line and then connected to the second interface;

[0013] The third interface is connected to the second series loop through a second connecting line and then connected to the fourth interface.

[0014] In a possible implementation manner, the battery disconnector further includes a fifth interface, and the fifth interface is electrically connected to the battery management system through a third connecting line.

[0015] In a possible implementation manner, the device further includes a plurality of fourth connecting lines and a bus, wherein one end of each of the fourth connecting lines is connected to the corresponding temperature sensor;

[0016] The other ends of all the fourth connection lines are connected to the battery management system through the bus.

[0017] In a possible implementation, the diameter of the gold wire is 0.01 mm to 1 mm.

[0018] In a possible implementation manner, the material of the gold wire includes aluminum, gold, silver or an alloy thereof.

[0019] In a possible implementation manner, the first connecting line and the second connecting line include a high-voltage busbar.

[0020] In a possible implementation manner, the number of battery cells in at least two of the series circuits is equal.

[0021] A second aspect of an embodiment of the present application provides a vehicle, comprising: a battery system as described in the first aspect.

[0022] In a possible implementation, the vehicle further includes a vehicle controller and an alarm, wherein the vehicle controller is electrically connected to a battery management system, and the vehicle controller is also connected to the alarm;

[0023] The vehicle controller is used to receive the action instructions of the battery management system and control the alarm to send out alarm information.

[0024] In the battery system and vehicle provided by the embodiment of the present application, at least two series circuits are used to provide the vehicle with the power required for driving. When thermal runaway occurs in at least one battery cell in a series circuit, the battery disconnector can cut off the series circuit where the battery cell with thermal runaway occurs, and form a voltage difference between the abnormal battery cell and the battery cell in parallel with it. The voltage difference is used to fuse the gold wire, so that the remaining series circuits can work normally. Such a setting can not only ensure the voltage balance of the battery cells under normal use, but also use the remaining series circuits to provide power for the vehicle under thermal runaway conditions, thereby ensuring the safety of the driver and passengers.

[0025] In addition to the technical problems solved by the embodiments of the present application, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the battery system and vehicle provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of a battery system provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of a vehicle provided in accordance with an embodiment of the present application.

[0029] Description of reference numerals:

[0030] 100: series circuit; 110: first series circuit; 120: second series circuit; 130: battery cell; 140: gold wire; 150: first connecting wire; 160: second connecting wire;

[0031] 200: battery disconnector; 210: first interface; 220: second interface; 230: third interface; 240: fourth interface; 250: fifth interface;

[0032] 300: temperature sensor;

[0033] 400: Battery management system;

[0034] 500: third connecting line;

[0035] 600: fourth connecting line;

[0036] 700: bus;

[0037] 800: Vehicle controller. DETAILED DESCRIPTION

[0038] As described in the background technology, the vehicles in the related technology have the problem of poor safety. The inventors have found that the reason for this problem is that after the battery management system detects that the battery cell has thermal runaway, it controls the battery disconnector to disconnect the battery's external series circuit. At this time, the driving force of the vehicle disappears, and the vehicle cannot be actively controlled, which is prone to danger. In addition, for a battery system with multiple battery cells connected in parallel, when a single battery cell has thermal runaway, a short circuit will occur inside, causing the voltage of the battery cell to drop rapidly, and other battery cells connected in parallel with the battery cell will discharge through the thermal runaway battery cell due to the voltage difference, causing the entire battery system to have a local short circuit, exacerbating the risk of heat diffusion.

[0039] In response to the above technical problems, the embodiments of the present application provide a battery system and a vehicle, which provide the power required for driving the vehicle through at least two relatively independent series circuits. When at least one battery cell in a series circuit has thermal runaway, the battery disconnector can cut off the series circuit where the battery cell with thermal runaway occurs, and form a voltage difference between the abnormal battery cell and the battery cell in parallel with it. The voltage difference is used to fuse the gold wire, so that the remaining series circuits can work normally. Such a setting can not only ensure the voltage balance of the battery cells under normal use, but also use the remaining series circuits to provide power for the vehicle under thermal runaway conditions, thereby ensuring the safety of the driver and passengers.

[0040] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0041] Embodiment 1

[0042] Please refer to the attached Figure 1 , an embodiment of the present application provides a battery system, which is used to provide power for driving a vehicle.

[0043] The battery system includes at least two series circuits 100, each of which is formed by a plurality of battery cells 130 connected in series. The corresponding battery cells 130 in the at least two series circuits 100 are connected in parallel via a gold wire 140.

[0044] In other words, the battery system may include two series circuits 100, three series circuits 100 or even multiple series circuits 100. Exemplarily, at least two series circuits 100 include a first series circuit 110 and a second series circuit 120, and the first series circuit 110 and the second series circuit 120 are relatively independently arranged. It should be noted that the relatively independent arrangement in this embodiment can be understood that when the battery cell 130 of one of the first series circuit 110 and the second series circuit 120 has thermal runaway, the other of the first series circuit 110 and the second series circuit 120 can continue to work normally to provide power for the vehicle.

[0045] The number of battery cells 130 in at least two series circuits 100 is equal. Exemplarily, the number of battery cells 130 in the first series circuit 110 is equal to the number of battery cells 130 in the second series circuit 120. For example, please continue to refer to the attached Figure 1 , the number of battery cells 130 in the first series circuit 110 is 10, and correspondingly, the number of battery cells 130 in the second series circuit 120 is 10. The 10 battery cells 130 in the first series circuit 110 are arranged in two rows and five columns, and the 10 battery cells 130 in the second series circuit 120 are also arranged in two rows and five columns, and are located in the area surrounded by the first series circuit 110. Such an arrangement can not only improve the compactness of the layout of the series circuit 100, but also make it more convenient for the gold wire 140 to connect the corresponding battery cells 130 in the first series circuit 110 and the second series circuit 120.

[0046] For example, with Figure 1 In the orientation shown, from left to right, the first battery cell 130 in the first series circuit 110 is connected in parallel with the first battery cell 130 in the second series circuit 120 through the gold wire 140; the second battery cell 130 in the first series circuit 110 is connected in parallel with the second battery cell 130 in the second series circuit 120 through the gold wire 140; and so on, until the last battery cell 130 in the first series circuit 110 is connected in parallel with the last battery cell 130 in the second series circuit 120 through the gold wire 140. In this way, the gold wire 140 can be used to realize the parallel connection of the corresponding battery cells 130, which plays a role in balancing the parallel battery cells 130 and improves the stability of the power output of the battery system.

[0047] Among them, the material of the gold wire 140 includes but is not limited to aluminum, gold, silver, etc. or their alloys. For example, the material of the gold wire 140 is aluminum or aluminum alloy; the material of the gold wire 140 is gold or gold alloy; the material of the gold wire 140 is silver or silver alloy.

[0048] In this embodiment, one end of the gold wire 140 can be connected to a battery cell 130 in the first series circuit 110 by bonding technology, and the other end of the gold wire 140 is connected to the corresponding battery cell 130 in the second series circuit 120. Such a configuration can not only facilitate the connection between the gold wire 140 and the battery cell 130, but also improve the connection stability between the gold wire 140 and the battery cell 130.

[0049] Please continue to refer to the attached Figure 1 If the diameter of the gold wire 140 is less than 0.01 mm, the diameter of the gold wire 140 is too small, which will increase the bonding difficulty of the gold wire 140 and make it difficult to fix the connection with the battery cell 130; and if the diameter of the gold wire 140 is too small, the resistance of the gold wire 140 will be increased, making it difficult to ensure the voltage balance of the two battery cells 130 connected in parallel.

[0050] If the diameter of the gold wire 140 is greater than 1 mm, the diameter of the gold wire 140 is too large, which may easily cause the gold wire 140 to be electrically connected to other components, resulting in a short circuit in the battery system.

[0051] In view of this, in this embodiment, the diameter of the gold wire 140 is 0.01mm~1mm; on the one hand, it can reduce the bonding difficulty of the gold wire 140 and ensure the voltage balance of the two parallel battery cells 130; on the other hand, it can also avoid electrical connection between the gold wire 140 and other devices, thereby improving the safety of the battery system.

[0052] Please continue to refer to the attached Figure 1 The battery system further includes a battery disconnector 200, and the battery disconnector 200 is electrically connected to at least two series circuits 100. That is, the battery disconnector 200 is electrically connected to the first series circuit 110, and at the same time, the battery disconnector 200 is electrically connected to the second series circuit 120. The battery disconnector 200 is used to control the on / off state of the first series circuit 110 and the second series circuit 120.

[0053] Exemplarily, the battery disconnector 200 includes a first interface 210, a second interface 220, a third interface 230, and a fourth interface 240. The first interface 210 is connected to the first series circuit 110 through the first connection line 150 and then connected to the second interface 220; that is, the first connection line 150 connects all the battery cells 130 in the first series circuit 110 in series, and connects the first battery cell 130 in the first series circuit 110 to the first interface 210 through the first connection line 150, and connects the last battery cell 130 in the first series circuit 110 to the second interface 220 through the first connection line 150, so that the battery disconnector 200 is connected in series in the first series circuit 110, so as to facilitate the on-off control of the first series circuit 110.

[0054] The third interface 230 is connected to the second series circuit 120 through the second connection line 160 and then connected to the fourth interface 240. That is, the second connection line 160 connects all the battery cells 130 in the second series circuit 120 in series, and connects the first battery cell 130 in the second series circuit 120 to the third interface 230 through the second connection line 160, and connects the last battery cell 130 in the second series circuit 120 to the fourth interface 240 through the second connection line 160, so that the battery disconnector 200 is connected in series in the second series circuit 120, so as to control the on and off of the second series circuit 120.

[0055] In this embodiment, the first connecting line 150 and the second connecting line 160 are both high-voltage busbars, which can improve the stability of the power transmission process.

[0056] It should be understood that the battery disconnector is generally a battery disconnect unit (BDU), the structure and function of which are known in the prior art and will not be further elaborated in this embodiment.

[0057] Please continue to refer to the attached Figure 1 The battery system further includes a plurality of temperature sensors 300. The plurality of temperature sensors 300 are arranged corresponding to the plurality of battery cells 130, and are used to detect the temperature of the corresponding battery cells 130; in other words, the number of the temperature sensors 300 is equal to the number of the battery cells 130, and each battery cell 130 is provided with a temperature sensor 300, and the temperature of the battery cell 130 is monitored in real time by using the temperature sensor 300.

[0058] The battery system further includes a battery management system 400, which is electrically connected to the plurality of temperature sensors 300 and the battery disconnector 200. Exemplarily, the battery disconnector 200 further includes a fifth interface 250, which is electrically connected to the battery management system 400 via a third connection line 500.

[0059] It should be noted that the battery management system 400 can be directly connected to the temperature sensor 300 through multiple connection lines, or there can be other connection methods. For example, the battery system also includes multiple fourth connection lines 600 and a bus 700, one end of each fourth connection line 600 is connected to the corresponding temperature sensor 300; the other ends of all fourth connection lines 600 are connected to the battery management system 400 through the bus 700.

[0060] The battery management system 400 is used to determine the abnormal battery cell 130 according to the detection result of each temperature sensor 300; this embodiment can timely and effectively detect the location of the battery cell 130 that has thermal failure by providing a temperature sensor 300 on each battery cell 130.

[0061] The battery management system 400 also controls the battery disconnector 200 to cut off the series circuit 100 where the abnormal battery cell 130 is located according to the received detection structure; wherein a voltage difference is formed between the abnormal battery cell 130 and the battery cell 130 connected in parallel with it, and the voltage difference is used to fuse the gold wire 140.

[0062] The battery management system 400 is used to receive the detected temperature of each temperature sensor 300. If the detected temperature of some battery cells 130 rises rapidly and exceeds the preset temperature threshold and time threshold, the battery management system 400 can determine in which series circuit the battery cell 130 with thermal failure is located according to the number of the temperature sensor 300 with abnormal temperature. For example, if the battery cell 130 with thermal failure is in the first series circuit 110, the battery management system 400 will issue an action instruction to close the first series circuit 110. When the battery disconnector 200 receives the above action instruction, it cuts off the first series circuit 110.

[0063] At the same time, a voltage difference is formed between the abnormal battery cell 130 and the battery cell 130 connected in parallel with it, and the voltage difference is used to melt the gold wire 140 to cut off the electrical connection between the first series circuit 110 and the second series circuit 120, so as to avoid the heat diffusion caused by the continuous passive discharge or short circuit of the battery cell 130 connected in parallel with the thermal runaway battery cell 130, so that the second series circuit 120 can work normally. Such a setting can not only ensure the voltage balance of the battery cells under normal use, but also use the remaining series circuits to provide power for the vehicle under thermal runaway conditions, thereby ensuring the safety of the driver and passengers.

[0064] Embodiment 2

[0065] An embodiment of the present application provides a vehicle, wherein the vehicle may be a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended-range vehicle, etc.

[0066] The vehicle includes the battery system described in any embodiment of Embodiment 1. Therefore, the vehicle provided in this embodiment includes the structure and beneficial effects of the battery system, which will not be described in detail in this embodiment.

[0067] In a possible implementation, please refer to the attached Figure 2 The vehicle further includes a vehicle controller 800 and an alarm (not shown in the figure), the vehicle controller 800 is electrically connected to the battery management system 400, and the vehicle controller 800 is also electrically connected to the alarm;

[0068] The vehicle controller 800 is used to receive the action instructions of the battery management system 400 and control the alarm to send out alarm information.

[0069] If the detected temperature of some battery cells 130 rises rapidly and exceeds the preset temperature threshold and time threshold, the battery management system 400 can determine in which series circuit the battery cell 130 with thermal failure is located based on the number of the temperature sensor 300 with the temperature abnormality. For example, if the battery cell 130 with thermal failure is in the first series circuit 110, the battery management system 400 will issue an action instruction to close the first series circuit 110, and the battery management system 400 will issue an alarm indication to the vehicle controller 800.

[0070] After the battery disconnector 200 receives the action instruction to shut down the first series circuit 110, it cuts off the first series circuit 110. After the vehicle controller 800 receives the alarm instruction from the battery management system 400, it controls the alarm to send an alarm message to remind the driver and passengers that there are safety hazards in the vehicle and to deal with them in time, thereby improving the safety of the driver and passengers. It should be understood that the alarm information in this embodiment can be an alarm sound and / or an alarm light.

[0071] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0072] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0073] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0074] It should be easily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0075] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0076] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery system, characterized in that: include: At least two series circuits, each of which is formed by connecting a plurality of battery cells in series; corresponding battery cells in at least two series circuits are connected in parallel via gold wires; A battery disconnector, wherein the battery disconnect unit is electrically connected to at least two of the series circuits; A plurality of temperature sensors, wherein the plurality of temperature sensors are arranged corresponding to the plurality of battery cells and are used to detect the temperature of the corresponding battery cells; A battery management system, wherein the battery management system is electrically connected to the plurality of temperature sensors and the battery disconnector; the battery management system is used to determine the abnormal battery cell according to the detection result of each temperature sensor; the battery management system also controls the battery disconnector to cut off the series circuit where the abnormal battery cell is located; Wherein, a voltage difference is formed between the abnormal battery cell and the battery cell connected in parallel therewith, and the voltage difference is used to fuse the gold wire.

2. The battery system according to claim 1, characterized in that: At least two of the series circuits include a first series circuit and a second series circuit; the battery disconnector includes a first interface, a second interface, a third interface and a fourth interface; The first interface is connected to the first series loop through a first connecting line and then connected to the second interface; The third interface is connected to the second series loop through a second connecting line and then connected to the fourth interface.

3. The battery system according to claim 1 or 2, characterized in that: The battery disconnector further includes a fifth interface, and the fifth interface is electrically connected to the battery management system via a third connecting line.

4. The battery system according to claim 3, characterized in that: It also includes a plurality of fourth connecting wires and a bus, one end of each of the fourth connecting wires being connected to the corresponding temperature sensor; The other ends of all the fourth connection lines are connected to the battery management system through the bus.

5. The battery system according to claim 1, characterized in that: The diameter of the gold wire is 0.01 mm to 1 mm.

6. The battery system according to claim 5, characterized in that: The material of the gold wire includes aluminum, gold, silver or alloys thereof.

7. The battery system according to claim 2, characterized in that: The first connecting line and the second connecting line include a high-voltage busbar.

8. The battery system according to claim 1 or 2, characterized in that: The number of battery cells in at least two of the series circuits is equal.

9. A vehicle, characterized in that: A battery system comprising any one of claims 1 to 8.

10. The vehicle according to claim 9, characterized in that The vehicle further comprises a vehicle controller and an alarm, wherein the vehicle controller is electrically connected to a battery management system, and the vehicle controller is also connected to the alarm; The vehicle controller is used to receive the action instructions of the battery management system and control the alarm to send out alarm information.

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