A self-heating battery device, battery module and control system

Abstract

This application discloses a self-heating battery device, battery module, and control system, relating to the field of automatic heating device technology. It includes: a heating film with a positive electrode connecting piece and a negative electrode connecting piece; the heating film is connected to a heating film copper busbar; the heating film copper busbar has a positive electrode copper busbar and a negative electrode copper busbar; the positive electrode connecting piece is connected to the positive electrode copper busbar; the negative electrode connecting piece is connected to the negative electrode copper busbar; the negative electrode copper busbar is connected to a negative electrode current-carrying membrane; the negative electrode current-carrying membrane is connected to a current-carrying membrane copper busbar; the current-carrying membrane copper busbar is connected to a positive electrode current-carrying membrane; and the positive electrode current-carrying membrane is connected to the positive electrode copper busbar of the heating film. This application adds a heating device within the module that contacts the battery cell, resulting in higher heat exchange efficiency and more targeted heating, avoiding the provision of heat energy to components that do not require heating, thus saving energy. The control system of this application can adjust the heating power in real time according to the battery temperature, more stably achieving the set temperature range.

Description

Technical Field

[0001] This application relates to the field of automatic heating device technology, and in particular to a self-heating battery device, battery module and control system. Background Technology

[0002] The demand for new energy vehicles is increasing daily, but the capacity, performance, and power of automotive power batteries will decrease to some extent in low-temperature environments, and charging may even be limited at extremely low temperatures. In winter in most cities, especially in high-latitude regions such as Northeast China, preheating of vehicle power batteries is necessary. Common battery systems have heating devices at the bottom, usually controlled by a relay switch, and the heating system is connected in series or parallel with the battery.

[0003] Existing heating systems are located at the bottom of the battery system. The heat generated is mainly absorbed by the module, battery pack casing, adjacent components, and the surrounding environment through heat exchange, resulting in low heating efficiency and energy waste. Heating conditions are also limited; the relay only activates the heating switch when charging or when a charging gun is plugged in, restricting heating capabilities. Current technology adds a separate heating device to the bottom of the battery system, which requires significant local structural space and suffers from poor compactness due to being an added component. Existing battery systems often consist of multiple cell packs, such as modules with multiple cell packs or high-voltage battery modules, requiring high heating current, high current-carrying capacity, and high-performance electrical connection materials. In such cases, a heating system malfunction will affect the heating performance of the entire battery system, rendering the heating function unusable and impacting user experience. Current heating methods generally use constant power heating, which can easily lead to overheating and thermal runaway risks. Summary of the Invention

[0004] To address the problems of existing battery heating technologies, such as unreasonable assembly of heating devices, large space occupation, harsh heating conditions, low heating efficiency, and the risk of thermal runaway during heating, this application provides a self-heating battery device, battery module, and control system. By arranging the self-heating battery device within the module, the overall space requirements of the battery system are reduced, with ample reserved space, facilitating the layout of related battery system components, resulting in higher heat exchange efficiency, more targeted heating, and avoiding the provision of heat energy to components that do not require heating, thus saving energy. The control system of this application can adjust the heating power in real time according to the battery temperature, keeping the battery temperature within a preset range and reducing the possibility of thermal runaway and other risks.

[0005] To address the aforementioned technical problems, this application provides a technical solution.

[0006] In a first aspect, this application provides a self-heating battery device, comprising: a heating film, the heating film having a positive electrode connecting piece and a negative electrode connecting piece, the heating film being connected to a heating film copper busbar, the heating film copper busbar being provided with a heating film positive electrode copper busbar and a heating film negative electrode copper busbar, the positive electrode connecting piece being connected to the heating film positive electrode copper busbar, the negative electrode connecting piece being connected to the heating film negative electrode copper busbar, the heating film negative electrode copper busbar being connected to a negative electrode current-carrying membrane, the negative electrode current-carrying membrane being connected to a current-carrying membrane copper busbar, the current-carrying membrane copper busbar being connected to a positive electrode current-carrying membrane, and the positive electrode current-carrying membrane being connected to the heating film positive electrode copper busbar.

[0007] Furthermore, the overcurrent membrane copper busbar is provided with an overcurrent membrane positive electrode copper busbar and an overcurrent membrane negative electrode copper busbar. The positive electrode overcurrent membrane is provided with two connectors, one of which is electrically connected to the heating membrane positive electrode copper busbar, and the other connector is electrically connected to the overcurrent membrane positive electrode copper busbar.

[0008] Furthermore, the negative electrode overcurrent membrane is provided with two connectors, one of which is electrically connected to the negative electrode copper busbar of the heating membrane, and the other connector is electrically connected to the negative electrode copper busbar of the overcurrent membrane.

[0009] Furthermore, the heating film has an automatic temperature limiting function; when the heating temperature exceeds the preset value, it will automatically stop heating.

[0010] Secondly, this application provides a battery module, including the self-heating battery device provided in any embodiment of this application. The module includes a lower housing, which is a groove-shaped housing. A cell stack is arranged on the groove-shaped housing. The cell stack includes a plurality of cells. A plurality of heating films and a plurality of heat insulation layers are arranged between the cells. The battery module is configured with an upper housing that matches the lower housing. The beginning and end ports of the battery module are also configured with module end plates, which are connected to the output ports. Heating film copper busbars and current flow film copper busbars are arranged on the top or side of the module.

[0011] Furthermore, the planar area of ​​the heating film is no larger than the contact area with the battery cell, and the upper housing is designed with a structure for installing and protecting the copper busbar, which is used to fix the copper busbar and inspect the battery module.

[0012] Furthermore, the module end plate is designed with positive and negative output interface structures for the heating battery device, which are used to increase the connection harness or connector structure for controlling the heating of the module.

[0013] Furthermore, the insulation layer is arranged between the battery cells, and its main material is insulation material, such as aerogel and insulation foam.

[0014] Thirdly, this application provides a control system for controlling the battery module provided in any embodiment of this application, including a monitoring module connected to a data processing module, the data processing module connected to a control module, the data processing module including a judgment module and a storage module; the system also includes a power supply module connected to the control module for supplying power to the system.

[0015] Furthermore, a monitoring module is used to monitor battery temperature, and a judgment module is used to determine whether the data monitored by the monitoring module exceeds a preset value.

[0016] Compared with the prior art, the technical solution provided in this application has the following advantages:

[0017] (1) Compared with the heating system located at the bottom of the battery system, adding a heating device in the module to contact the battery cell results in higher heat exchange efficiency, more targeted heating, avoids providing heat energy to components that do not need to be heated, and saves energy.

[0018] (2) No heating is required when charging or plugging in a charging gun. Heating control is uniformly controlled by the control system according to the actual needs of the battery system. The heating conditions are more extensive than those of traditional battery heating systems.

[0019] (3) The self-heating battery device of this application is arranged in the module, which has low space requirements for the entire battery system and large reserved space, making it convenient for the layout of battery system related components.

[0020] (4) Compared with conventional multi-pack cells or high-voltage battery modules, the self-heating battery device proposed in this application has a stronger current carrying capacity and requires more user-friendly electrical connection materials under the condition of needing high-power heating.

[0021] (5) Compared with the prior art, if a single heating film fails, it only affects the heating efficiency of the two cells adjacent to the faulty heating film for a short time, and has little impact on the heating performance of the entire battery system.

[0022] (6) The existing battery system uses constant power for heating, which makes the control of module heating temperature unstable. The heating control system of this application can adjust the heating power in real time according to the battery temperature, and more stably reach the set temperature range.

[0023] (7) The overall heating system of a conventional battery system is generally designed according to the specifications of the battery system, while the self-heating battery device of the module provided in this application has a wider range of applications and can be applied to the arrangement of battery packs using modules with the self-heating battery device. Attached Figure Description

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

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the self-heating battery device according to an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the structure of a battery module with a self-heating battery device according to an embodiment of this application;

[0028] Figure 3 This is a cross-sectional structural diagram of a battery module with a self-heating battery device according to an embodiment of this application;

[0029] Figure 4 This is a schematic diagram of the heating control process according to an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the control system according to an embodiment of this application.

[0031] Figure label:

[0032] 1. Heating film; 2. Heating film copper busbar; 3. Current membrane; 31. Negative electrode current membrane; 32. Positive electrode current membrane; 4. Current membrane copper busbar; 5. Upper shell; 6. FPC; 7. Cell stack; 8. Module end plate; 9. Thermal insulation layer; 10. Lower shell; 11. Cell; 12. Monitoring module; 13. Data processing module; 14. Judgment module; 15. Storage module; 16. Control module; 17. Power supply module. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] The English abbreviations and their Chinese meanings appearing in this application are as follows:

[0037] FPC (Flexible Printed Circuit)

[0038] BMS (Battery Management System)

[0039] Example 1

[0040] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a self-heating battery device according to an embodiment of this application. In a preferred embodiment of this application, a self-heating battery device includes: a heating film, the heating film having a positive electrode connecting piece and a negative electrode connecting piece, the heating film being connected to a heating film copper busbar, the heating film copper busbar being provided with a heating film positive electrode copper busbar and a heating film negative electrode copper busbar, the positive electrode connecting piece being connected to the heating film positive electrode copper busbar, the negative electrode connecting piece being connected to the heating film negative electrode copper busbar, the heating film negative electrode copper busbar being connected to a negative electrode current-carrying membrane, the negative electrode current-carrying membrane being connected to a current-carrying membrane copper busbar, the current-carrying membrane copper busbar being connected to a positive electrode current-carrying membrane, and the positive electrode current-carrying membrane being connected to the heating film positive electrode copper busbar.

[0041] In this embodiment, the overcurrent membrane copper busbar is provided with an overcurrent membrane positive electrode copper busbar and an overcurrent membrane negative electrode copper busbar. The positive electrode overcurrent membrane is provided with two connectors, one of which is electrically connected to the heating membrane positive electrode copper busbar and the other connector is electrically connected to the overcurrent membrane positive electrode copper busbar.

[0042] In this embodiment, the negative electrode overcurrent membrane is provided with two connectors, one of which is electrically connected to the negative electrode copper busbar of the heating membrane, and the other connector is electrically connected to the negative electrode copper busbar of the overcurrent membrane.

[0043] In this embodiment, the heating film has an automatic temperature limiting function, which automatically stops heating when the heating temperature exceeds a preset value.

[0044] Please see Figure 3 , Figure 3 This is a cross-sectional structural diagram of a battery module with a self-heating battery device according to an embodiment of this application. In a preferred embodiment of this application, the heat insulation layer is arranged between the cells. The main material selected is heat insulation material, such as aerogel, heat insulation foam, etc. The main functions are three: ① battery heating and heat preservation; ② thermal runaway protection (single cell thermal runaway, to a certain extent slowing down the spread of heat) ③ shock absorption and absorption of cell swelling (after cycle use, the battery will swell to a certain extent, or protect against impact vibration).

[0045] In this embodiment, the heating film and the heat insulation layer are evenly distributed within the battery cells according to the space inside the module and the number of battery cells, so as to ensure uniform heating, heat preservation, and protection, which is beneficial to the performance of the battery system.

[0046] In this embodiment, the positions of the two flow membranes are not limited and can be adjacent to or separated from the heating membrane by one or more cells. The electrical connection positions of the flow membranes are not specifically limited. The figure shows the top and side, but they can also be arranged on the same side or opposite sides. The heat insulation layer is arranged between the cells. The specific number and position are not specifically required. It is necessary to comprehensively consider factors such as heat insulation requirements and arrangement space. The detailed dimensions (area, thickness, etc.) are determined according to the actual situation.

[0047] Example 2

[0048] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery module with a self-heating battery device according to an embodiment of this application. In a preferred embodiment of this application, a battery module includes the self-heating battery device provided in any embodiment of this application. The battery module includes a lower housing, which is a groove-shaped housing. A cell stack is arranged on the groove-shaped housing. The cell stack includes a plurality of cells. A plurality of heating films and a plurality of heat insulation layers are arranged between the cells. The battery module is equipped with an upper housing that matches the lower housing. The first and last ports of the battery module are also equipped with module end plates, which are connected to output ports. Heating film copper busbars and current flow film copper busbars are arranged on the top and sides of the module. They can be arranged on the same side or opposite sides, which is also within the protection scope of this proposal. The heating films are arranged between the cells. The specific number is not specifically required. One or more heating films can be designed according to the heating power requirements of the product. The arrangement position is not specifically required. It is recommended to distribute them evenly between the cells to ensure uniform heating.

[0049] In this embodiment, the heating film and the heat insulation layer can be arranged in a cross arrangement, with the heating film placed between the two battery cells and a heat insulation layer placed on each of the left and right sides of the two battery cells. The specific arrangement of the heating film and the heat insulation layer can be determined according to specific needs.

[0050] In this embodiment, the planar area of ​​the heating film is not greater than the contact area with the battery cell, and the upper housing is designed with a structure for installing and protecting the copper busbar, which is used to fix the copper busbar and inspect the battery module.

[0051] In this embodiment, the module end plate is designed with positive and negative output interface structures for the heating battery device, which are used to increase the connection harness or connector structure for controlling the heating of the module.

[0052] Example 3

[0053] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of the control system according to an embodiment of this application. In a preferred embodiment of this application, a control system is characterized in that the system is used to control any module of claims 5 to 7, including a monitoring module, the monitoring module being connected to a data processing module, the data processing module being connected to a control module, and the data processing module including a judgment module and a storage module.

[0054] In this embodiment, the monitoring module is used to monitor the battery temperature, and the judgment module is used to judge whether the data monitored by the monitoring module exceeds a preset value.

[0055] In this embodiment, the system also includes a power supply module for supplying power to the system.

[0056] In this embodiment, the heating film has variable heating power, with the heating voltage remaining constant according to the real-time temperature of the battery, which facilitates heating control; the current of the heating film can change with the temperature increase, and heating will automatically stop when the preset temperature is reached.

[0057] In this embodiment, the module's control system is equipped with the function of comprehensively evaluating FPC information and controlling the switching of the self-heating battery device, and can be connected to the entire battery management system (BMS).

[0058] In this embodiment, the module can be replaced by a battery pack, which refers to the battery pack that uses the self-heating battery device. The BMS in the battery pack should have the function of controlling the switch of the self-heating battery device.

[0059] The control system primarily utilizes a variable heating power for the heating film, adjusting for real-time battery temperature while maintaining a constant heating voltage for easy heating control. The heating film's current varies with temperature, automatically stopping heating when the preset temperature is reached. For details, please refer to [link to relevant documentation]. Figure 4 , Figure 4This is a schematic diagram of the heating control process according to an embodiment of this application. In a preferred embodiment of this application, the real-time temperature of the battery is set to T, the start heating temperature is T1, and the stop heating temperature is T2. A control method includes the following steps:

[0060] S1: Turn on the control system and monitor the battery temperature T;

[0061] S2: Determine if the battery temperature T is lower than T1. If the battery temperature T is higher than T1, heating is not required. If the battery temperature T is lower than T1, control the heating film to be energized to heat the module.

[0062] S3: Monitor the battery temperature T during heating and determine whether the battery temperature T during heating has reached T2. If it has not reached T2, continue heating. If the battery temperature T reaches T2, control the heating film to turn off and stop heating the module. At the same time, monitor the real-time battery temperature T and return to step S2 so that the real-time battery temperature T is between T1 and T2.

[0063] The working principle of this technical solution is as follows: A heating device is added within the module to contact the battery cell, resulting in higher heat exchange efficiency and more targeted heating. This avoids providing heat to components that do not require heating, thus saving energy. Heating control is uniformly managed by the control system according to the actual needs of the battery system, providing a wider range of heating conditions compared to traditional battery heating systems. Placing the self-heating battery device within the module reduces the overall space requirements of the battery system, allowing for more space to be reserved and facilitating the layout of related battery system components. Compared to existing technologies, if a single heating film fails, it only affects the heating efficiency of the two adjacent cells for a short period, having minimal impact on the overall heating performance of the battery system. The control system of this application can adjust the heating power in real time based on the battery temperature, achieving a more stable set temperature range. The self-heating battery device provided in this application has a wider range of applications and can be used in the arrangement of battery packs using modules equipped with this self-heating battery device.

[0064] The above are merely preferred embodiments of this application; however, the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and its improved concept, should be covered within the scope of protection of this application.

Claims

1. A self-heating battery device, characterized in that, include: A heating film has a positive electrode connecting piece and a negative electrode connecting piece. The heating film is connected to a heating film copper busbar, which is provided with a positive electrode copper busbar and a negative electrode copper busbar. The positive electrode connecting piece is connected to the positive electrode copper busbar, and the negative electrode connecting piece is connected to the negative electrode copper busbar. The negative electrode copper busbar is connected to a negative electrode current-carrying membrane, which is connected to a current-carrying membrane copper busbar. The current-carrying membrane copper busbar is provided with a positive electrode current-carrying membrane copper busbar and a negative electrode current-carrying membrane copper busbar. The positive electrode current-carrying membrane has two connectors, one of which is electrically connected to the positive electrode copper busbar of the heating film, and the other of which is electrically connected to the positive electrode copper busbar of the current-carrying membrane. The negative electrode current-carrying membrane has two connectors, one of which is electrically connected to the negative electrode copper busbar of the heating film, and the other of which is electrically connected to the negative electrode copper busbar of the current-carrying membrane. The heating film has an automatic temperature limiting function; when the heating temperature exceeds a preset value, it will automatically stop heating.

2. A battery module, characterized in that, The battery module includes the self-heating battery device as described in claim 1. The battery module includes a lower housing, which is a groove-shaped housing. A cell stack is arranged on the groove-shaped housing. The cell stack includes a plurality of cells. A plurality of heating films and a plurality of heat insulation layers are arranged between the cells. The battery module is equipped with an upper housing that matches the lower housing. The beginning and end ports of the battery module are also equipped with module end plates. The module end plates are connected to the output ports. The heating film copper busbar and the current-passing film copper busbar are arranged on the top or side of the module.

3. The battery module according to claim 2, characterized in that, The planar area of ​​the heating film is not greater than the contact area with the battery cell. The upper housing is designed with a structure for installing and protecting the copper busbar, which is used to fix the copper busbar and inspect the battery module.

4. The battery module according to claim 3, characterized in that, The module end plate is designed with positive and negative output interface structures for the heating battery device, which are used to increase the connection harness or connector structure for controlling the heating of the module.

5. The battery module according to claim 3, characterized in that, The insulation layer is arranged between the battery cells, and its material is selected as insulation material, such as aerogel or insulation foam.

6. A control system, characterized in that, The system is used to control the battery module according to any one of claims 2 to 4, including a monitoring module, the monitoring module being connected to a data processing module, the data processing module being connected to a control module, the data processing module including a judgment module and a storage module; the system further includes a power module, the power module being connected to the control module, for supplying power to the system; The monitoring module is used to monitor the battery temperature, and the judgment module is used to judge whether the data monitored by the monitoring module exceeds a preset value.

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