Soft package cell thermal management temperature acquisition structure

Abstract

The utility model relates to the technical field of new energy automobiles, and discloses a heat management temperature acquisition structure for a soft package battery cell, which comprises a temperature sampling unit and a heat dissipation back plate which are arranged on the soft package battery cell, two opposite tabs of the soft package battery cell are welded, and the heat dissipation back plate is arranged between the two opposite tabs of the soft package battery cell and serves as a tab fin; and the temperature sampling unit is arranged on the surface of the heat dissipation back plate or the tab position or a welding area between two opposite tabs. The battery cell intrinsic temperature acquisition device can meet the requirements of battery cell intrinsic temperature acquisition in multiple scenes, and is convenient to operate and accurate in temperature measurement.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to a soft-pack battery core thermal management temperature acquisition structure. Background Art

[0002] With the vigorous development of the new energy vehicle industry in recent years, the safety of power batteries has attracted great attention and has become an important factor affecting the development of the new energy vehicle industry. The safety of lithium-ion power batteries refers to the ability of the battery to suppress a series of unsafe behaviors caused by external initial disturbances under normal use or abuse. These behaviors may cause the battery to short-circuit, burn, explode, and other dangerous situations, thereby endangering the safety of personnel and property. Among them, the initial external disturbance can be various types of charging processes such as electricity, heat, and machinery, including battery short circuit, overcharge, short circuit, over-discharge, thermal shock, mechanical shock, etc. The insecurity of the battery is mainly caused by the thermal runaway phenomenon of the battery. That is to say, when there is a short circuit, high current discharge, overcharge, etc. inside the battery, a large amount of heat will be generated inside the battery, causing the temperature of the system to continue to rise, thereby causing thermal runaway of the battery. Monitoring the battery temperature can help us perceive the unsafe state of the battery in time and take corresponding measures to reduce the safety risk of the battery. Therefore, the thermal management of lithium-ion power batteries has become an important research direction in battery research and development and application.

[0003] At present, in the thermal management of power batteries, the commonly used power battery temperature collection scheme is to arrange the temperature sampling points on the battery cell body of the power battery to represent the actual temperature of the battery cell. Correspondingly, the temperature collection device is directly or indirectly connected to the battery cell body through an adhesive. Although this method can effectively measure the temperature of the battery cell body, its layout position is easily limited. Since the temperature collection point is usually integrated with the voltage collection point, the temperature collection position is limited to the battery cell body, which will lead to a high design cost of the sampling harness. In addition, when the system design requires multi-sided cooling of the battery module, it may not be possible to arrange the temperature sampling points on the surface of the battery cell body. And there are also temperature collection point solutions set on the pole ear, which are easily affected by the battery working conditions and lead to inaccurate temperature measurement; specifically, due to the temperature difference between the pole ear and the battery cell body when the high-rate current flows, the temperature of the pole ear itself cannot effectively represent the temperature of the battery cell body. Utility Model Content

[0004] The utility model aims to provide a soft-pack battery core thermal management temperature collection structure, which can meet the battery core intrinsic temperature collection needs in multiple scenarios, is easy to operate and has accurate temperature measurement.

[0005] The basic scheme provided by the utility model is: a soft-pack battery core thermal management temperature collection structure, comprising a temperature sampling unit and a heat dissipation back plate arranged on the soft-pack battery core; the two opposite pole ears of the soft-pack battery core are welded, and the heat dissipation back plate is arranged between the two opposite pole ears of the soft-pack battery core and serves as a pole ear fin; the temperature sampling unit is arranged on the surface of the heat dissipation back plate or the pole ear position or the welding area between the two opposite pole ears.

[0006] Furthermore, two opposing pole ears are respectively connected to the heat dissipation back plate to form a group.

[0007] Furthermore, the cross section of the heat dissipation back plate is rectangular.

[0008] Furthermore, the heat dissipation back plate is a heat dissipation fin.

[0009] Furthermore, the temperature sampling unit is arranged on a side away from the cooling structure of the soft-pack battery cell.

[0010] Furthermore, the heat dissipation back plate is an aluminum alloy plate, a copper-aluminum composite plate, or an aluminum-silicon alloy plate.

[0011] The working principle and advantages of the utility model are: by adopting the temperature acquisition structure, the temperature sampling unit can be moved from the conventional battery body area to the side surface or the pole ear position of the battery, etc., and is no longer subject to the structural restrictions of the battery body area, which is more convenient for wiring and installation of the temperature sampling unit. In addition, when the overall module of the soft-pack battery cell needs to be cooled on multiple sides, the temperature acquisition structure will not hinder the multi-side cooling work, and the temperature sampling points are easy to arrange and adjust.

[0012] When the overall module of the soft-pack battery cell is in a high-rate current overcurrent condition, affected by the working conditions, there is a temperature difference between the tab and the battery body, and the temperature of the tab itself cannot effectively represent the temperature of the battery body. The heat dissipation backplane in this temperature acquisition structure can be used as a rib to dissipate heat at the tab position. In specific applications, the size and material of the heat dissipation backplane can be adjusted as needed to further fine-tune the heat dissipation of the heat dissipation backplane, so as to adjust the difference between the tab temperature and the battery body temperature to meet the measurement requirements (such as adjusting the difference to less than 0.1°C, etc.). That is, the operating temperature difference at the tab can be compensated by the heat dissipation backplane, and the temperature sampling unit in this temperature acquisition structure can be relatively immune to the influence of the operating temperature difference, thereby measuring the accurate battery body temperature.

[0013] The utility model discloses a soft-pack battery core thermal management temperature collection structure, provides a new temperature measurement route, relocates the setting position of the temperature sampling unit, and sets the temperature sampling unit around the pole ear. The installation and wiring of the temperature sampling unit is more convenient and will not interact with the cooling work of the battery core, and can meet the battery core intrinsic temperature collection requirements in multiple scenarios. The temperature difference influence at the pole ear is relatively eliminated through the heat dissipation back plate, and the direct temperature measurement of the temperature sampling unit around the pole ear can be guaranteed to be accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a partial structural schematic diagram of a first embodiment of a soft-pack battery core thermal management temperature collection structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the overall structure of a first embodiment of a soft-pack battery core thermal management temperature collection structure of the utility model. DETAILED DESCRIPTION

[0016] The following is a further detailed description through specific implementation methods:

[0017] The symbols in the drawings of the specification include: temperature sampling unit 1, heat dissipation back plate 2, pole ear 3, and battery cell 4.

[0018] Embodiment 1

[0019] The embodiment is basically as shown in the attached Figure 1 and Figure 2 Shown: A soft-pack battery core thermal management temperature collection structure, including a temperature sampling unit 1 and a heat dissipation back plate 2 arranged on a soft-pack battery core 4.

[0020] The two opposite pole ears 3 of the soft-pack battery cell 4 are welded, and the heat dissipation back plate 2 is arranged between the two opposite pole ears 3 of the soft-pack battery cell 4 and serves as a rib of the pole ear 3. Specifically, in this embodiment, the two opposite pole ears 3 on the left side of the soft-pack battery cell 4 are welded, and the heat dissipation back plate 2 is fixedly arranged on the welding area between the two opposite pole ears 3.

[0021] The cross section of the heat dissipation back plate 2 is rectangular. The heat dissipation back plate 2 is an aluminum alloy plate or a copper-aluminum composite plate or an aluminum-silicon alloy plate. In this embodiment, a rectangular aluminum alloy plate is used as the heat dissipation back plate 2; its structure is regular, easy to process and install, and has strong heat conduction and heat dissipation capabilities, and will not hinder temperature collection.

[0022] The temperature sampling unit 1 is arranged on the surface of the heat dissipation back plate 2 or the position of the pole ear 3 or the welding area between two opposite pole ears 3. The temperature sampling unit 1 can adopt a conventional temperature sampling module. In this embodiment, the temperature sampling unit 1 is fixedly mounted on the surface of the heat dissipation back plate 2. In addition, the temperature sampling unit 1 is arranged on a side away from the cooling structure of the soft-pack battery cell 4; so as to avoid the cooling structure affecting the temperature sampling unit 1 on the measurement of the temperature of the soft-pack battery cell 4.

[0023] By adopting this temperature acquisition structure, the temperature sampling unit 1 can be moved from the conventional battery cell 4 body area to the side surface of the battery cell 4 or the position of the pole ear 3, etc., and is no longer subject to the structural restrictions of the battery cell 4 body area, which is more convenient for wiring and installation of the temperature sampling unit 1. In addition, when the overall module of the soft-pack battery cell 4 needs to be cooled on multiple sides, this temperature acquisition structure will not hinder the multi-side cooling work, and the temperature sampling points are easy to arrange and adjust.

[0024] When the whole module of the soft-pack battery cell 4 is in a high-rate current overcurrent condition, affected by the working conditions, there is a temperature difference between the tab 3 and the battery cell 4 body, and the temperature of the tab 3 itself cannot effectively represent the temperature of the battery cell 4 body. The heat dissipation backplane 2 in this temperature acquisition structure can be used as a rib to dissipate heat at the tab 3 position. In specific applications, the size and material of the heat dissipation backplane 2 can be adjusted as needed to further fine-tune the heat dissipation of the heat dissipation backplane 2, so as to adjust the difference between the temperature of the tab 3 and the temperature of the battery cell 4 body to meet the measurement requirements (such as adjusting the difference to be less than 0.1°C, etc.). That is, the operating temperature difference at the tab 3 can be compensated by the heat dissipation backplane 2, and the temperature sampling unit 1 in this temperature acquisition structure can be relatively immune to the influence of the operating temperature difference, thereby accurately measuring the battery cell 4 body temperature.

[0025] The present embodiment provides a soft-pack battery cell thermal management temperature collection structure, which can meet the intrinsic temperature collection requirements of the battery cell 4 in multiple scenarios, is easy to operate and can measure temperature accurately.

[0026] Embodiment 2

[0027] A soft-pack battery core thermal management temperature collection structure is different from the first embodiment in that two opposing pole ears 3 are respectively connected to the heat dissipation back plate 2 to form a group. That is, the two opposing pole ears 3 are welded through the heat dissipation back plate 2.

[0028] The present embodiment provides a soft-pack battery core thermal management temperature collection structure, which has a simpler overall structure than the first embodiment.

[0029] Embodiment 3

[0030] A soft-pack battery core thermal management temperature collection structure is different from the first embodiment in that the heat dissipation back plate 2 is a heat dissipation fin; and the temperature sampling unit 1 is arranged at the position of the pole ear 3.

[0031] The present embodiment provides a soft-pack battery cell thermal management temperature collection structure. Compared with the first embodiment, the heat dissipation effect of the heat dissipation fins is better than that of ordinary flat-plate heat dissipation parts. It can dissipate heat in time and compensate for the temperature difference between the pole ear 3 and the battery cell 4 body, which is convenient for the temperature sampling unit 1 to accurately measure the temperature.

[0032] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A soft-pack battery core thermal management temperature collection structure, characterized in that: It includes a temperature sampling unit and a heat dissipation back plate arranged on a soft-pack battery cell; the two opposite pole ears of the soft-pack battery cell are welded, and the heat dissipation back plate is arranged between the two opposite pole ears of the soft-pack battery cell and serves as a pole ear fin; the temperature sampling unit is arranged on the surface of the heat dissipation back plate or the pole ear position or the welding area between the two opposite pole ears.

2. A soft-pack battery core thermal management temperature collection structure according to claim 1, characterized in that: The two opposite pole ears are respectively connected to the heat dissipation back plate to form a group.

3. The soft-pack battery core thermal management temperature acquisition structure according to claim 1, characterized in that: The cross section of the heat dissipation back plate is rectangular.

4. The soft-pack battery core thermal management temperature acquisition structure according to claim 1, characterized in that: The heat dissipation back plate is a heat dissipation fin.

5. The soft-pack battery core thermal management temperature collection structure according to claim 1, characterized in that: The temperature sampling unit is arranged on a side away from the cooling structure of the soft-pack battery cell.

6. The soft-pack battery core thermal management temperature collection structure according to claim 1, characterized in that: The heat dissipation back plate is an aluminum alloy plate, a copper-aluminum composite plate, or an aluminum-silicon alloy plate.

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