Tab heating system

Abstract

The utility model relates to the technical field of batteries, in particular to a tab heating system which comprises a lithium battery module and a heating device, the lithium battery module comprises a plurality of single batteries which are connected in series and / or in parallel, and the plurality of single batteries are electrically conducted through connecting pieces connected to the tabs; the heating device comprises a control module and a plurality of insulating heating pieces, the insulating heating pieces are installed on the connecting pieces in a one-to-one correspondence mode, and all the insulating heating pieces are electrically connected with the control module. The lithium battery module solves the problems that heat energy cannot be fully utilized by a heating method adopted by an existing lithium battery module, so that resource waste is caused, the size of the lithium battery module is increased, and the use of the lithium battery module is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a tab heating system. Background Art

[0002] The dual pressures of climate change and environmental pollution have boosted the rapid development of electric vehicles. Lithium-ion batteries have become the preferred battery for electric vehicle powertrains due to their high energy density and long cycle life. However, the internal resistance of batteries increases sharply at low temperatures, and the output power and available energy drop significantly. In addition, batteries are difficult to charge at low temperatures, and lithium dendrites are easily generated during charging, causing safety hazards, which greatly limits the promotion and use of lithium-ion batteries in cold environments.

[0003] Since battery performance is very sensitive to temperature, its performance recovers quickly after the battery temperature rises, so rapid heating of the battery is an effective way to improve battery performance. For this reason, more and more battery packs with heating structures have appeared on the market. Referring to the utility model patent with announcement number CN217426899U, it discloses a new structure of a special heating plate that can ensure the uniformity of heating of the lithium battery module. The scheme is to set a heating plate outside the lithium battery module and use the heating plate to heat the lithium battery. This design not only cannot fully conduct heat to the lithium battery, but also causes more losses, and will cause the overall volume of the lithium battery module to increase, affecting the use of the lithium battery module; in addition, there are also methods of heating from the outside such as wide-line metal film heating method and electric heating film heating method on the market. Such methods need to heat the battery through contact conduction, air convection conduction or liquid heat transfer. Because external heating easily forms a temperature gradient in the battery pack, most of the energy is dissipated, so the energy utilization efficiency is low.

[0004] Therefore, it is necessary to provide a technical solution to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the problem that the heating method adopted by the existing lithium battery module cannot fully utilize the heat energy, resulting in resource waste, and will increase the volume of the lithium battery module, affecting the use of the lithium battery module.

[0006] To achieve the above-mentioned purpose, the utility model provides a tab heating system, including a lithium battery module and a heating device; the lithium battery module includes a plurality of single cells connected in series and / or in parallel, and the plurality of single cells are electrically connected via connecting plates connected to the tabs; the heating device includes a control module and a plurality of insulating heating elements, the plurality of insulating heating elements are mounted one by one on the plurality of connecting plates, and each of the insulating heating elements is electrically connected to the control module.

[0007] More specifically, the lithium battery module is further provided with a plurality of insulating heat-balancing heat-conducting parts, and two adjacent connecting sheets are connected via the insulating heat-balancing heat-conducting parts.

[0008] More specifically, the insulating heating element includes an electric heating plate, which is in close contact with a connecting plate. A power supply is provided outside the lithium battery module, each of the electric heating plates is electrically connected to the power supply, and the power supply is electrically connected to the control module.

[0009] More specifically, the insulating heating element includes a heating tube, which is in close contact with the connecting piece. An evaporative heater is arranged outside the lithium battery module, each of the heating tubes is electrically connected to the evaporative heater, and the evaporative heater is electrically connected to the control module.

[0010] More specifically, the interior of the evaporative heater is filled with a heat-conducting medium, and a plurality of evaporation ports are arranged on the exterior thereof. A flexible heat-conducting pipe is arranged at each of the evaporation ports, and each of the flexible heat-conducting pipes is connected to each of the heating pipes one by one.

[0011] More specifically, the lithium battery module is provided with a detection module, a first judgment module and a second judgment module, the detection module is electrically connected to the first judgment module and the second judgment module respectively, and the first judgment module and the second judgment module are both electrically connected to the control module.

[0012] More specifically, a temperature sensor is provided on the lithium battery module, and the detection module is connected to the temperature sensor.

[0013] The technical effects of a tab heating system involved in the utility model are:

[0014] The present application sets the insulating heating element on each connecting piece, and the connecting piece is connected to the pole ear of the single cell, which is the heat input port for heating the battery. When the lithium battery module needs to be heated, the insulating heating piece is connected to the power supply to release heat, and the heat is transferred to the two pole ears of the single cell through the connecting piece, thereby heating the collector inside the single cell, and achieving the purpose of heating the lithium battery module. The design of the present application not only has high energy utilization and can quickly heat the lithium battery module, but also the overall space occupied by the heating device is small, and will not interfere with the use of the lithium battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a first implementation scheme of a tab heating system involved in the utility model;

[0016] Figure 2 It is a structural schematic diagram of a second implementation scheme of a tab heating system involved in the utility model;

[0017] Figure 3 The utility model is a process flow chart of a tab heating system.

[0018] Markings in the figure:

[0019] 1. Lithium battery module; 11. Single battery; 12. Connecting piece; 13. Insulated heat balance heat conductor; 2. Heating device; 21. Insulated heating element; 22. Evaporative heater; 23. Flexible heat pipe. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] It should be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be a central element at the same time; when an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In the description of the embodiments of the present invention, it should be understood that the directions or positional relationships indicated by “up”, “down”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside”, etc., are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] In order to more clearly illustrate the technical solution of the utility model, a preferred embodiment is provided below. Figure 1 to Figure 3A tab heating system includes a lithium battery module 1 and a heating device 2; the lithium battery module 1 includes a plurality of single cells 11 connected in series and / or in parallel, and the plurality of single cells 11 are electrically connected via a connecting piece 12 connected to the tab; the heating device 2 includes a control module and a plurality of insulating heating elements 21, the plurality of insulating heating elements 21 are mounted on the plurality of connecting pieces 12 one by one, and each insulating heating element 21 is electrically connected to the control module.

[0025] Compared with the prior art, the present invention involves a tab heating system, which is different in that the present invention sets the insulating heating element 21 on each connecting piece 12, and the connecting piece 12 is connected to the tab of the single cell 11, which is the heat input port for heating the battery. When the lithium battery module 1 needs to be heated, the insulating heating piece 21 is connected to the power supply to release heat, and the heat is transferred to the two tabs of the single cell 11 through the connecting piece 12, thereby heating the collector inside the single cell 11, and achieving the purpose of heating the lithium battery module 1. The design of the present invention not only has high energy utilization and can quickly heat the lithium battery module 1, but also the overall space occupied by the heating device 2 is small, and will not interfere with the use of the lithium battery module 1. The tab heating system is suitable for heating the lithium battery module 1 when the electric vehicle is started, and is also suitable for providing a constant temperature to the lithium battery module 1 to ensure the stable performance of the lithium battery module 1, and the tab heating system can cooperate with other external heating battery structures to further improve the heating speed of the lithium battery module 1.

[0026] In this embodiment, the lithium battery module 1 is further provided with a plurality of insulating heat balance heat conducting members 13, and two adjacent connecting sheets 12 are connected by the insulating heat balance heat conducting members 13. The above design realizes the heat conduction of each connecting sheet 12, which is to balance the temperature between each single battery 11 on the one hand, and to make the outside of the single battery 11 more evenly heat-insulated and heated on the other hand.

[0027] As a preferred solution of this embodiment, the insulating heating element 21 includes an electric heating sheet, which is in close contact with the connecting sheet 12. A power supply is provided outside the lithium battery module 1, and each electric heating sheet is electrically connected to the power supply, which is electrically connected to the control module. In actual application, the control module controls the power supply to supply power to the electric heating sheet so that the electric heating sheet generates heat, and the heat is conducted to the single battery 11 through the connecting sheet 12.

[0028] As another preferred scheme of this embodiment, the insulating heating element 21 includes a heating tube, which is in close contact with the connecting plate 12. An evaporative heater 22 is arranged outside the lithium battery module 1. Each heating tube is electrically connected to the evaporative heater 22, and the evaporative heater 22 is electrically connected to the control module.

[0029] Furthermore, the interior of the evaporative heater 22 is filled with a heat-conducting medium, and a plurality of evaporation ports are provided on the exterior thereof, each of which is provided with a flexible heat-conducting pipe 23, and each of the flexible heat-conducting pipes 23 is connected to each of the heating pipes in a one-to-one correspondence. In actual application, the evaporative heater 22 is started by controlling the control module, and the evaporative heater 22 generates a large amount of hot air, which is conducted to the heating pipe through the flexible heat-conducting pipe 23, and the heat on the heating pipe is conducted to the single battery 11 through the connecting piece 12.

[0030] In addition, the insulating heating element 21 can also adopt the heating film or heating plate disclosed in Chinese patent documents such as announcement numbers CN217389024U, CN216905345U, CN213718245U, CN205159468U, CN205723873U, CN216773353U, CN217116440U, CN205069813U, CN205723872U, CN208094816U, CN207677040U, and CN207009608U.

[0031] In this embodiment, a detection module, a first judgment module and a second judgment module are provided on the lithium battery module 1. The detection module is electrically connected to the first judgment module and the second judgment module respectively, and the first judgment module and the second judgment module are both electrically connected to the control module.

[0032] In actual application, the heating steps for lithium battery modules are as follows:

[0033] Step 1: Obtain the surface temperature value of the lithium battery module 1 through the detection module. Specifically, the BMS (abbreviation of BATTERY MANAGEMENT SYSTEM) of the lithium battery module 1 is provided with a battery temperature monitoring function, and the detection module obtains the surface temperature value of the lithium battery module 1 by connecting to it; and considering that the lithium battery module 1 cannot be started at low temperatures, a temperature sensor can be independently set to obtain the surface temperature value of the lithium battery module 1, and the detection module obtains the surface temperature value of the lithium battery module 1 through the temperature sensor.

[0034] Step 2: The first judgment module receives the information detected by the detection module, and judges whether the surface temperature value of the lithium battery module 1 is lower than the first temperature threshold. If so, step 3 is executed, otherwise step 1 is continued. Specifically, the charging temperature of the lithium-ion battery is usually limited to 0°C to 60°C, and the discharging temperature is usually limited to -20°C to 60°C. The selection of the first temperature threshold can be determined according to the use status of the battery. For example, in the charging state, the first temperature threshold is selected as 0°C, in the discharging state, the first temperature threshold is -10°C, and so on.

[0035] Step 3: Control the insulating heating element 21 to start up through the control module, so that the insulating heating element 21 releases heat to heat the single battery 11 .

[0036] Step 4: The second judgment module receives the information detected by the detection module and judges whether the surface temperature of the lithium battery module 1 is higher than the second temperature threshold. If so, step 5 is executed, otherwise, step 3 is continued. Specifically, the selection of the second temperature threshold can be determined according to the use status of the battery. For example, in the charging state, the second temperature threshold is 30°C; in the discharging state, the second temperature threshold is 20°C.

[0037] Step 5: Control the insulating heating element 21 to be turned off through the control module so that the insulating heating element 21 stops releasing heat.

[0038] The above description is only a preferred embodiment of the present invention, and its structure is not limited to the shapes listed above. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tab heating system, comprising a lithium battery module and a heating device; the lithium battery module comprises a plurality of single cells connected in series and / or in parallel, and the plurality of single cells are electrically connected through a connecting sheet connected to the tab; characterized in that: The heating device comprises a control module and a plurality of insulating heating elements. The plurality of insulating heating elements are mounted on the plurality of connecting plates in a one-to-one correspondence, and each of the insulating heating elements is electrically connected to the control module.

2. The tab heating system according to claim 1, characterized in that: The lithium battery module is also provided with a plurality of insulating heat balance heat conducting parts, and two adjacent connecting sheets are connected via the insulating heat balance heat conducting parts.

3. The tab heating system according to claim 1, characterized in that: The insulating heating element includes an electric heating plate, which is in close contact with a connecting plate. A power supply is provided outside the lithium battery module. Each of the electric heating plates is electrically connected to the power supply, and the power supply is electrically connected to the control module.

4. The tab heating system according to claim 1, characterized in that: The insulating heating element includes a heating tube, which is in close contact with the connecting piece. An evaporative heater is arranged outside the lithium battery module. Each of the heating tubes is electrically connected to the evaporative heater, and the evaporative heater is electrically connected to the control module.

5. The tab heating system according to claim 4, characterized in that: The interior of the evaporative heater is filled with a heat-conducting medium, and a plurality of evaporation ports are arranged on the exterior thereof. A flexible heat-conducting pipe is arranged at each of the evaporation ports, and each of the flexible heat-conducting pipes is connected to each of the heating pipes in a one-to-one correspondence.

6. The tab heating system according to claim 1, characterized in that: The lithium battery module is provided with a detection module, a first judgment module and a second judgment module. The detection module is electrically connected to the first judgment module and the second judgment module respectively. The first judgment module and the second judgment module are both electrically connected to the control module.

7. The tab heating system according to claim 6, characterized in that: A temperature sensor is arranged on the lithium battery module, and the detection module is connected to the temperature sensor.

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