Multi-parallel PACK battery system and terminal equipment

Abstract

The utility model provides a multi-parallel PACK battery system and terminal equipment, the multi-parallel PACK battery system comprises a control unit and a battery assembly, the battery assembly comprises N parallel branches, each parallel branch comprises a switch assembly and a battery pack which are connected in series, and the output end of the battery assembly is used for connecting a cooling loop; the control unit is connected with the control end of the switch assembly in each parallel branch; the control unit is used for controlling the target switch assembly to be switched from the closed state to the open state when it is determined that a fault battery pack exists, the fault battery pack is a battery pack in any parallel branch, and the target switch assembly is a switch assembly connected with the fault battery pack in series. When any one battery pack breaks down, the control unit can control the target switch assembly to be switched to be in the off state, so that the fault battery pack stops supplying energy, heat diffusion is avoided, meanwhile, the remaining battery packs can still supply energy to the cooling loop and continue to refrigerate, and therefore the heat diffusion risk is restrained.

Description

Technical Field

[0001] This utility model relates to the field of battery management, and more specifically, to a multi-parallel PACK battery system and terminal device. Background Technology

[0002] Currently, commercial vehicles and energy storage systems typically employ multi-parallel battery pack (PACK) systems, also known as multi-parallel PACK battery systems. The cooling circuit of a multi-parallel PACK battery system is usually powered by its own high voltage. When a multi-parallel PACK battery system fails, its on / off function relies primarily on relays and / or fuses within the high-voltage box.

[0003] When a multi-parallel battery pack experiences a thermal failure, the relay in the high-voltage box disconnects, causing the entire multi-parallel battery pack to stop outputting power. This prevents the compressor in the cooling circuit from cooling and the water pump from circulating water. In other words, under thermal failure conditions, the system will completely lose its active cooling function, increasing the risk of heat diffusion. Utility Model Content

[0004] The purpose of this invention is to provide a multi-parallel PACK battery system and terminal device to at least partially improve the above-mentioned problems.

[0005] To achieve the above objectives, the technical solution adopted in this utility model embodiment is as follows:

[0006] In a first aspect, this utility model provides a multi-parallel PACK battery system, which includes a control unit and a battery assembly. The battery assembly includes N parallel branches, each of which includes a series-connected switch assembly and a battery pack. The output terminal of the battery assembly is used to connect to a cooling circuit.

[0007] The control unit is connected to the control terminal of the switch assembly in each of the parallel branches;

[0008] The control unit is used to control the target switch assembly to switch from a closed state to an open state when a faulty battery pack is determined to exist, wherein the faulty battery pack is a battery pack in any of the parallel branches, and the target switch assembly is a switch assembly connected in series with the faulty battery pack.

[0009] Optionally, the control unit is further configured to acquire temperature and / or voltage information of each of the battery packs;

[0010] The control unit is also used to determine whether there is a faulty battery pack based on the temperature and / or voltage information of each of the battery packs.

[0011] Optionally, the battery pack includes multiple battery modules connected in series, and each battery module includes multiple battery strings connected in series and / or in parallel.

[0012] The voltage information of the battery pack includes the voltage information corresponding to each of the battery strings, and the temperature information of the battery pack includes the temperature information corresponding to each of the battery modules.

[0013] Optionally, each of the battery modules is provided with multiple temperature sensors;

[0014] The temperature sensor is used to detect the temperature information corresponding to the battery module and transmit the temperature information to the control unit.

[0015] Optionally, each of the battery strings is equipped with a corresponding voltage sensor;

[0016] The voltage sensor is used to collect voltage information corresponding to the battery string and transmit the voltage information to the control unit.

[0017] Optionally, the multi-parallel PACK battery system further includes a high-voltage box, which includes a first protection switch and a second protection switch;

[0018] One end of the first protection switch is connected to the positive terminal of the N parallel branches, and the other end of the first protection switch serves as the positive output terminal of the multi-parallel PACK battery system.

[0019] One end of the second protection switch is connected to the negative terminal of the N parallel branches, and the other end of the second protection switch serves as the negative output terminal of the multi-parallel PACK battery system.

[0020] The control unit is connected to the control terminal of the first protection switch and the control terminal of the second protection switch, respectively.

[0021] The control unit is used to control the state of the first protection switch and the second protection switch according to the state information of the multi-parallel PACK battery system.

[0022] Optionally, the first protective switch and the second protective switch are relays or active fuses.

[0023] Optionally, the switching assembly is a relay switch.

[0024] Optionally, the control unit is further configured to determine the target switching assembly based on a mapping table when a faulty battery pack is determined, the mapping table including the mapping relationship between each battery pack and the switching assembly.

[0025] Secondly, this utility model provides a terminal device including the above-mentioned multi-parallel PACK battery system.

[0026] Compared to existing technologies, this utility model provides a multi-parallel battery pack system and terminal device. The multi-parallel battery pack system includes a control unit and battery modules. Each battery module includes N parallel branches, each parallel branch comprising a series-connected switch assembly and a battery pack. The output terminal of the battery module is used to connect to a cooling circuit. The control unit is connected to the control terminal of the switch assembly in each parallel branch. When a faulty battery pack is detected, the control unit controls the target switch assembly to switch from a closed state to an open state. The faulty battery pack is any battery pack in a parallel branch, and the target switch assembly is a switch assembly connected in series with the faulty battery pack. When any battery pack fails, the control unit can control the target switch assembly to switch to an open state, causing the faulty battery pack to stop supplying power and preventing heat diffusion. Simultaneously, the remaining battery packs can still supply power to the cooling circuit to continue cooling, thereby suppressing the risk of heat diffusion.

[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is one of the structural schematic diagrams of a multi-parallel PACK battery system provided in an embodiment of this utility model.

[0030] Figure 2 This is the second schematic diagram of the structure of the multi-parallel PACK battery system provided in the embodiment of this utility model.

[0031] Figure 3 The third schematic diagram of the multi-parallel PACK battery system provided in this embodiment of the present invention.

[0032] In the diagram: 10-Control unit; 20-Battery assembly; 21-Parallel branch; 211-Switch assembly; 212-Battery pack; 212A-Battery management unit; 212B-Temperature sensor; 212C-Voltage sensor; 30-High voltage box. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] To address the problem that when a portion of the battery pack fails (including, but not limited to, thermal failure), the entire multi-parallel battery pack system stops supplying power, thereby rendering the cooling circuit (compressor refrigeration and water pump circulation) inoperable, resulting in a complete loss of active cooling capability and increased risk of heat dissipation, this utility model provides a multi-parallel battery pack system. Please refer to [reference needed]. Figure 1 , Figure 1 This is one of the structural schematic diagrams of a multi-parallel PACK battery system provided in an embodiment of this utility model.

[0040] The multi-parallel PACK battery system includes a control unit 10 and a battery assembly 20. The battery assembly 20 includes N parallel branches 21, each of which includes a series-connected switch assembly 211 and a battery pack 212. The output of the battery assembly 20 is used to connect to a cooling circuit, which can be used to connect to a thermal management unit, which has both cooling and heating functions. N is greater than or equal to 2.

[0041] It should be noted that, in an optional embodiment, the output terminal of the battery assembly 20 is also used to connect other circuits, including but not limited to a power output circuit.

[0042] In the diagram, PACKi represents the battery pack in the i-th parallel branch 21. When the battery pack 20 is working, it can supply energy to the cooling circuit to achieve a cooling effect.

[0043] The control unit 10 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0044] The control unit 10 is connected to the control terminal of the switch assembly 211 in each parallel branch 21.

[0045] The control unit 10 is used to control the target switch assembly to switch from a closed state to an open state when it is determined that there is a faulty battery pack. The faulty battery pack is the battery pack 212 in any parallel branch 21, and the target switch assembly is the switch assembly 211 connected in series with the faulty battery pack.

[0046] In the multi-parallel PACK battery system provided in this embodiment of the present invention, when any battery pack fails, the control unit can control the target switching component to switch to the off state, so that the faulty battery pack stops supplying power and avoids heat diffusion. At the same time, the remaining battery packs can still supply power to the cooling circuit and continue to cool, thereby suppressing the risk of heat diffusion, improving system safety, and reducing property damage.

[0047] Based on the foregoing, this utility model embodiment also provides an optional implementation method for determining whether the battery pack has malfunctioned, please refer to the following text.

[0048] The control unit 10 is also used to acquire monitoring index information of each battery pack 212, wherein the monitoring index information includes one or more of the following: temperature information, voltage information, smoke detection information, aerosol detection information, electrolyte composition detection information, and pressure detection information.

[0049] The control unit 10 is also used to determine whether there is a faulty battery pack based on the monitoring index information of each battery pack 212.

[0050] Based on the foregoing, regarding the structure of the battery pack, this utility model embodiment also provides an optional implementation method, please refer to the following text.

[0051] The battery pack 212 includes multiple battery modules connected in series, each battery module including multiple battery strings connected in series and / or in parallel, each battery string including multiple batteries connected in series and / or in parallel.

[0052] The voltage information of the battery pack 212 includes the voltage information corresponding to each battery string, and the temperature information of the battery pack 212 includes the temperature information corresponding to each battery module.

[0053] Please refer to Figure 2 , Figure 2 This is the second schematic diagram of the structure of the multi-parallel PACK battery system provided in the embodiment of this utility model.

[0054] Optionally, each battery module is equipped with multiple temperature sensors 212B, and each battery string is equipped with a corresponding voltage sensor 212C.

[0055] Temperature sensor 212B is connected to battery management unit 212A (BMS) in battery pack 212, and voltage sensor 212C is connected to battery management unit 212A in battery pack 212. Battery management unit 212A in battery pack 212 is connected to control unit.

[0056] Temperature sensor 212B is used to detect the temperature information of the battery module and transmit the temperature information to control unit 10.

[0057] Temperature sensor 212B can transmit the detected temperature information of the battery module to battery management unit 212A, which performs initial processing and then transmits the processed temperature information to control unit 10.

[0058] The voltage sensor 212C is used to collect the voltage information corresponding to the battery string and transmit the voltage information to the control unit 10.

[0059] The voltage sensor 212C can transmit the detected voltage information of the battery module to the battery management unit 212A, which performs initial processing and then transmits the processed voltage information to the control unit 10.

[0060] In one optional implementation, each battery pack 212 includes K battery modules, each battery module includes H battery strings, and each battery module is equipped with G temperature sensors. Therefore, a battery pack 212 includes K × H = X battery strings and K × G = Y temperature sensors. That is, a battery pack 212 corresponds to X voltage information and Y temperature information.

[0061] The temperature information of the i-th battery pack 212 obtained by the control unit 10 includes (T i-1 To T i-Y ), where T i-y Let represent the temperature information collected by the y-th temperature sensor in the i-th battery pack 212, where 1≤y≤Y and 1≤i≤N.

[0062] The voltage information of the i-th battery pack 212 obtained by the control unit 10 includes (V i-1 To V i-X ), where V i-x Let X represent the power information corresponding to the x-th voltage string collected by the x-th voltage sensor in the i-th battery pack 212, where 1≤x≤X.

[0063] And / or, each battery pack is equipped with one or more of the following: smoke detection sensor, aerosol detection sensor, electrolyte composition detection sensor, and pressure detection sensor.

[0064] The smoke detection sensor, aerosol detection sensor, electrolyte composition detection sensor, and pressure detection sensor are all connected to the control unit 10 and are used to transmit the monitored information (smoke detection information, aerosol detection information, electrolyte composition detection information, and pressure detection information) to the control unit 10.

[0065] To further enhance the protective effect, this embodiment of the invention also provides an optional implementation method, please refer to... Figure 3 , Figure 3 The third schematic diagram of the multi-parallel PACK battery system provided in this embodiment of the present invention.

[0066] The PACK battery system also includes a high-voltage box 30, which includes a first protection switch S1 and a second protection switch S2.

[0067] One end of the first protection switch S1 is connected to the positive terminal of the N parallel branches 21, and the other end of the first protection switch S1 serves as the positive output terminal of the multi-parallel PACK battery system.

[0068] One end of the second protection switch S2 is connected to the negative terminal of the N parallel branches 21, and the other end of the second protection switch S2 serves as the negative output terminal of the multi-parallel PACK battery system.

[0069] The control unit 10 is connected to the control terminal of the first protection switch S1 and the control terminal of the second protection switch S2.

[0070] The control unit 10 is used to control the state of the first protection switch S1 and the second protection switch S2 according to the state information of the multi-parallel PACK battery system.

[0071] Optionally, the status information of the multi-parallel PACK battery system includes voltage and temperature information corresponding to each battery pack 212.

[0072] Optionally, the first protective switch S1 and the second protective switch S2 are relays or active fuses.

[0073] Optionally, the switch assembly 211 may be a relay switch.

[0074] In an alternative embodiment, the control unit 10 is further configured to determine a target switching assembly based on a mapping table when a faulty battery pack is determined to exist. The mapping table includes the mapping relationship between each battery pack 212 and the switching assembly 211.

[0075] This utility model embodiment also provides a terminal device, which includes the above-described multi-parallel PACK battery system. This terminal device can be, but is not limited to, electric vehicles and energy storage systems.

[0076] In summary, this utility model provides a multi-parallel PACK battery system and terminal device. The multi-parallel PACK battery system includes a control unit and battery modules. The battery modules include N parallel branches, each parallel branch including a series-connected switch assembly and a battery pack. The output terminal of the battery module is used to connect to a cooling circuit. The control unit is connected to the control terminal of the switch assembly in each parallel branch. When a faulty battery pack is detected, the control unit controls the target switch assembly to switch from a closed state to an open state. The faulty battery pack is any battery pack in the parallel branch, and the target switch assembly is a switch assembly connected in series with the faulty battery pack. When any battery pack fails, the control unit can control the target switch assembly to switch to an open state, causing the faulty battery pack to stop supplying power and preventing heat diffusion. At the same time, the remaining battery packs can still supply power to the cooling circuit to continue cooling, thereby suppressing the risk of heat diffusion.

[0077] 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.

[0078] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-parallel PACK battery system, characterized in that, The multi-parallel PACK battery system includes a control unit and a battery assembly. The battery assembly includes N parallel branches, each of which includes a series-connected switch assembly and a battery pack. The output of the battery assembly is used to connect to a cooling circuit. The control unit is connected to the control terminal of the switch assembly in each of the parallel branches; The control unit is used to control the target switch assembly to switch from a closed state to an open state when a faulty battery pack is determined to exist, wherein the faulty battery pack is a battery pack in any of the parallel branches, and the target switch assembly is a switch assembly connected in series with the faulty battery pack.

2. The multi-parallel PACK battery system as described in claim 1, characterized in that, The control unit is also used to acquire monitoring index information of each of the battery packs, wherein the monitoring index information includes one or more of the following: temperature information, voltage information, smoke detection information, aerosol detection information, electrolyte composition detection information, and pressure detection information. The control unit is also used to determine whether there is a faulty battery pack based on the monitoring index information of each battery pack.

3. The multi-parallel PACK battery system as described in claim 1, characterized in that, The battery pack includes multiple battery modules connected in series, and each battery module includes multiple battery strings connected in series and / or in parallel. The voltage information of the battery pack includes the voltage information corresponding to each of the battery strings, and the temperature information of the battery pack includes the temperature information corresponding to each of the battery modules.

4. The multi-parallel PACK battery system as described in claim 3, characterized in that, Each of the battery modules is equipped with multiple temperature sensors; The temperature sensor is used to detect the temperature information corresponding to the battery module and transmit the temperature information to the control unit; And / or, each battery pack is equipped with one or more of the following: smoke detection sensor, aerosol detection sensor, electrolyte composition detection sensor, and pressure detection sensor; The smoke detection sensor, aerosol detection sensor, electrolyte composition detection sensor, and pressure detection sensor are all connected to the control unit and are used to transmit the monitored information to the control unit.

5. The multi-parallel PACK battery system as described in claim 3, characterized in that, Each of the battery strings is equipped with a corresponding voltage sensor; The voltage sensor is used to collect voltage information corresponding to the battery string and transmit the voltage information to the control unit.

6. The multi-parallel PACK battery system as described in claim 1, characterized in that, The multi-parallel PACK battery system also includes a high-voltage box, which includes a first protection switch and a second protection switch; One end of the first protection switch is connected to the positive terminal of the N parallel branches, and the other end of the first protection switch serves as the positive output terminal of the multi-parallel PACK battery system. One end of the second protection switch is connected to the negative terminal of the N parallel branches, and the other end of the second protection switch serves as the negative output terminal of the multi-parallel PACK battery system. The control unit is connected to the control terminal of the first protection switch and the control terminal of the second protection switch, respectively. The control unit is used to control the state of the first protection switch and the second protection switch according to the state information of the multi-parallel PACK battery system.

7. The multi-parallel PACK battery system as described in claim 6, characterized in that, The first protective switch and the second protective switch are relays or active fuses.

8. The multi-parallel PACK battery system as described in claim 1, characterized in that, The switching assembly uses a relay switch.

9. The multi-parallel PACK battery system as described in claim 1, characterized in that, The control unit is also configured to determine the target switching assembly based on a mapping table when a faulty battery pack is identified, the mapping table including the mapping relationship between each battery pack and the switching assembly.

10. A terminal device, characterized in that, Includes the multi-parallel PACK battery system as described in any one of claims 1-9.

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