Cell temperature acquisition device for soft package battery

Abstract

The utility model relates to the technical field of power batteries, and discloses a battery cell temperature acquisition device for a soft package battery, which comprises a heat dissipation shell and a temperature sampling element which are arranged on a soft package battery cell, the heat dissipation shell is arranged on the outer side of the soft package battery cell in a sleeving manner and is detachably connected with the soft package battery cell; the temperature sampling element is arranged on the surface of the heat dissipation shell; and the heat dissipation shell is a shell made of a good heat conduction material. The battery cell temperature measuring device is simple in overall structure, convenient to disassemble and assemble, not prone to being influenced by battery working conditions and capable of accurately measuring the temperature of the battery cell body.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery core temperature acquisition device for soft-pack batteries. Background Art

[0002] The development of new energy has become an important trend in the global energy field today. With the gradual popularization of new energy, power batteries, as an excellent energy storage device, have also been widely used in people's daily lives, especially in vehicles and other means of transportation, and have broad application prospects in future new energy vehicles. Power batteries have been widely recognized by the market for their advantages such as lightness, high efficiency and stability. However, the chemical composition inside power batteries (here mainly lithium-ion batteries as an example) - lithium, nickel or cobalt, as well as graphite, copper and aluminum - is very sensitive to temperature changes. Power batteries have the best performance in the temperature range of 10° to 25°C. The higher the temperature at which the battery is stored, the faster it self-discharges. In actual application, the power battery is prone to heat and high temperature, which leads to explosions and poses safety hazards. Therefore, how to ensure and improve the safety of power batteries has become an important research direction in the current new energy field. The temperature monitoring of the power battery cell is a key link. Through accurate and timely temperature monitoring, the unsafe state of the battery can be sensed in time to ensure the safety of the power battery.

[0003] At present, the commonly used power battery temperature monitoring solution is to place the temperature acquisition device directly or indirectly through an adhesive on the battery cell body of the power battery to represent the actual temperature of the battery cell. Although this method can effectively measure the temperature of the battery cell body, its layout position is easily limited. Since the temperature acquisition point is usually integrated with the voltage acquisition point, the temperature acquisition 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 temperature sampling points on the surface of the battery cell body. There are also temperature acquisition point solutions set on the tabs, which are easily affected by the battery operating conditions and lead to inaccurate temperature measurement; specifically, due to the temperature difference between the tabs and the battery cell body when a large current rate flows, the temperature of the tabs itself cannot effectively represent the temperature of the battery cell body. Utility Model Content

[0004] The utility model aims to provide a battery core temperature collection device for a soft-pack battery, which is easy to assemble and disassemble, is not easily affected by the battery working conditions, and can accurately measure the battery core body temperature.

[0005] The basic scheme provided by the utility model is: a battery cell temperature collection device for a soft-pack battery, comprising a heat dissipation shell and a temperature sampling element arranged on the soft-pack battery cell; the heat dissipation shell is sleeved on the outside of the soft-pack battery cell and is detachably connected to the soft-pack battery cell; the temperature sampling element is arranged on the surface of the heat dissipation shell; the heat dissipation shell is a shell of a good thermal conductive material.

[0006] Furthermore, the heat dissipation housing is a C-shaped housing, a U-shaped housing, or an L-shaped housing.

[0007] Furthermore, the temperature sampling element is an NTC thermistor.

[0008] Furthermore, the heat dissipation shell is an aluminum alloy shell, a copper-aluminum composite shell, or an aluminum-silicon alloy shell.

[0009] Furthermore, the temperature sampling element is bonded to the heat dissipation housing.

[0010] Furthermore, the temperature sampling element is also connected to the sampling harness; and the two are connected in an integrated manner, welded, or connected via a connector.

[0011] Furthermore, the temperature sampling element is arranged at a target area on the surface of the heat dissipation shell; the target area is an area corresponding to the height position where the average temperature of the body of the soft-pack battery is located, or an area corresponding to the height position where the maximum temperature of the body of the soft-pack battery is ±2°C.

[0012] The working principle and advantages of the utility model are:

[0013] Compared with the conventional temperature measurement scheme of placing the temperature acquisition device directly or indirectly through adhesive on the battery body of the power battery, the temperature sampling element in this scheme indirectly collects the temperature of the battery body through the heat dissipation shell, and uses the thermal conductivity of the shell of good thermal conductive material to achieve accurate measurement of the temperature of the battery body. With this structure, when installing the temperature sampling element, there is no need to consider avoiding the wiring layout on the battery body, but it can be directly adhered or clamped on the heat dissipation shell, which is more convenient to install and will not affect the battery body.

[0014] Moreover, when the whole module of the soft-pack battery cell needs to be cooled on multiple sides, the detachable heat dissipation shell and the easily adjustable temperature sampling element can be adaptively adjusted in position without affecting the multi-side cooling work. In addition, compared with the solution of temperature collection points on the tabs, when the whole module of the soft-pack battery cell is in a high-rate current overcurrent condition, this solution will not be affected by the high temperature at the tabs, and the temperature measurement can remain stable and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a partial structural schematic diagram of the first embodiment of the battery core temperature collection device for soft-pack batteries of the utility model;

[0016] Figure 2 The figure is a schematic diagram of the overall structure of the first embodiment of the battery core temperature collection device for soft-pack batteries of the utility model. DETAILED DESCRIPTION

[0017] The following is a further detailed description through specific implementation methods:

[0018] The symbols in the drawings of the specification include: soft-pack battery cell 1, heat dissipation shell 2, temperature sampling element 3, and sampling harness 4.

[0019] Embodiment 1

[0020] The embodiment is basically as shown in the attached Figure 1 and Figure 2 As shown: a battery cell temperature collection device for a soft-pack battery, comprising a heat dissipation shell 2 and a temperature sampling element 3 arranged on a soft-pack battery cell 1.

[0021] The heat dissipation shell 2 is sleeved on the outside of the soft-pack battery cell 1 and is detachably connected to the soft-pack battery cell 1; the temperature sampling element 3 is arranged on the surface of the heat dissipation shell 2; the heat dissipation shell 2 is a shell of a good thermal conductive material. Specifically, the heat dissipation shell 2 is a C-shaped shell or a U-shaped shell or an L-shaped shell. And the heat dissipation shell 2 is an aluminum alloy shell or a copper-aluminum composite shell or an aluminum-silicon alloy shell. In this embodiment, a U-shaped aluminum alloy shell is used, and its thermal conductivity is ≥150W / (m·K). The sleeve is more stable and the heat dissipation area covers a wider area, and the heat dissipation effect is better.

[0022] Specifically, the temperature sampling element 3 is an NTC thermistor. The temperature sampling element 3 is bonded to the heat dissipation housing 2 and the connection is stable. Furthermore, the temperature sampling unit can be connected to other devices (such as data acquisition devices, etc.) through the sampling harness 4, and the wiring will not interfere with the existing harness 4 on the battery body. And the connection between the two is integrated connection, welding or connection through a connector.

[0023] The temperature sampling element 3 is arranged at the target area on the surface of the heat dissipation shell 2; the target area is the area corresponding to the height position where the average temperature of the body of the soft-pack battery cell 1 is located, or the area corresponding to the height position where the maximum temperature of the body of the soft-pack battery cell 1 is ±2°C. In this embodiment, the temperature sampling element is arranged at the 50% height position in the Z direction of the surface of the heat dissipation shell 2 (in actual application, this position can be adaptively adjusted according to different battery cell conditions). The temperature collected at this position is close to the average temperature of the body of the soft-pack battery cell 1. With this structure, the setting position of the temperature sampling element 3 is optimal, and the measured temperature is closest to the actual temperature representation of the battery cell body.

[0024] The present embodiment provides a battery cell temperature collection device for a soft-pack battery, which has a simple overall structure, is easy to assemble and disassemble, is not easily affected by the battery operating conditions, and can accurately measure the battery cell body temperature.

[0025] Embodiment 2

[0026] The battery cell temperature collection device for soft-pack batteries is different from the first embodiment in that the temperature sampling element 3 is arranged at 70% height position in the Z direction of the surface of the heat dissipation shell 2 and is bonded to the heat dissipation shell 2; the temperature collected at this position differs from the maximum temperature of the battery cell body by ≤2°C, so that real-time monitoring and detection of the battery cell temperature can be realized.

[0027] The present embodiment provides a cell temperature collection device for a soft-pack battery. Compared with the first embodiment, the setting position of the temperature sampling element 3 is adjusted.

[0028] 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 cell temperature acquisition device for a soft-pack battery, characterized in that: It includes a heat dissipation shell and a temperature sampling element arranged on the soft-pack battery core; the heat dissipation shell is sleeved on the outside of the soft-pack battery core and is detachably connected to the soft-pack battery core; the temperature sampling element is arranged on the surface of the heat dissipation shell; the heat dissipation shell is a shell of good thermal conductive material.

2. The battery core temperature acquisition device for a soft pack battery according to claim 1, characterized in that: The heat dissipation housing is a C-shaped housing, a U-shaped housing, or an L-shaped housing.

3. The battery core temperature acquisition device for a soft pack battery according to claim 1, characterized in that: The temperature sampling element is an NTC thermistor.

4. The battery core temperature acquisition device for a soft pack battery according to claim 1, characterized in that: The heat dissipation housing is an aluminum alloy housing, a copper-aluminum composite housing, or an aluminum-silicon alloy housing.

5. The battery core temperature acquisition device for soft-pack batteries according to claim 1, characterized in that: The temperature sampling element is bonded to the heat dissipation housing.

6. The battery core temperature acquisition device for soft-pack batteries according to claim 1, characterized in that: The temperature sampling element is also connected to the sampling wire harness; and the two are connected in an integral manner, welded, or connected via a connector.

7. The battery core temperature acquisition device for a soft pack battery according to claim 1, characterized in that: The temperature sampling element is arranged at a target area on the surface of the heat dissipation shell; the target area is an area corresponding to the height position where the average temperature of the body of the soft-pack battery cell is located, or an area corresponding to the height position where the maximum temperature of the body of the soft-pack battery cell is ±2°C.

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