Battery temperature measurement device

Abstract

To provide a battery temperature measurement device that can optimize an assembly step of a battery module, measure voltage, current, and temperature with one device, and optimize the assembly space of the battery module.SOLUTION: A temperature measurement device for measuring the temperature of a battery cell includes: a temperature measurement substrate 100 including a temperature sensor and mounted on an integrated circuit board; a plated layer 120 formed of a metal material, formed on one surface of the temperature measurement substrate 100, electrically connected to the battery cell, and allowing charging and discharging current to flow for the battery cell; and a temperature measurement pattern 110, which is a conductive pattern, formed on the other surface of the temperature measurement substrate and electrically connected to the temperature sensor included in the temperature measurement substrate.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a battery temperature measuring device. [Background technology]

[0002] Recently, with the rapid increase in demand for portable electronic products such as notebook computers, video cameras, and mobile phones, and the full-scale development of electric vehicles, energy storage batteries, robots, and satellites, research into high-performance secondary batteries that can be repeatedly charged and discharged is being actively conducted. Currently, commercial secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries, among which lithium secondary batteries are attracting attention due to their advantages of almost no memory effect compared to nickel-based secondary batteries, freedom to charge and discharge, very low self-discharge rate, and high energy density.

[0003] Batteries are used in a variety of fields, and recently, fields where batteries are widely used, such as electric vehicles or smart grid systems, often require large capacity. In order to increase the capacity of a battery pack, there is a method of increasing the capacity of the secondary battery, i.e., the battery cell itself. In this case, there are disadvantages in that the effect of increasing the capacity is not large, there is a physical limit to the expansion of the size of the secondary battery, and management is inconvenient. Therefore, in general, a battery pack in which a number of battery modules are connected in series and parallel is widely used.

[0004] Such a battery pack often includes a battery management system (BMS) that manages the battery modules. Furthermore, the battery management system (BMS) can monitor the temperature, voltage, current, etc. of the battery modules and control the balancing operation, cooling operation, charging operation, discharging operation, etc. of the battery pack based on the monitored state of the battery modules.

[0005] The temperature of the battery module, i.e., the temperature of the secondary battery, is a factor that has a significant effect on the performance of the battery pack. In general, the battery pack can operate efficiently when the temperature of the secondary battery is distributed within an appropriate temperature range. For example, if the temperature of the secondary battery is excessively high, the safety of the negative electrode crystal lattice of the secondary battery is reduced, thereby degrading the performance of the battery pack. On the other hand, if the temperature of the secondary battery is excessively low, the performance of the battery pack is degraded due to a reduction in the charge / discharge capacity caused by an increase in the internal resistance and polarization voltage of the secondary battery.

[0006] Conventionally, when measuring the temperature of a battery using a temperature sensor mounted on an integrated circuit board of a battery management system (BMS) provided in a battery module, the temperature sensor is connected to a wire harness structure and mounted on the integrated circuit board of the battery management system (BMS) in a structure distinct from a voltage tap for measuring voltage. Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved by the present invention is to provide a battery temperature measuring device capable of optimizing the assembly process of a battery module. Another problem to be solved by the present invention is to provide a battery temperature measuring device capable of optimizing the assembly space of a battery module by measuring voltage, current, and temperature using one device. However, such problems are merely examples and do not limit the scope of the present invention. [Means for solving the problem]

[0008] As a technical means for achieving the above-mentioned technical object, there is provided a temperature measuring device for measuring the temperature of a battery cell, the temperature measuring device including a temperature measuring substrate having a temperature sensor and mounted on an integrated circuit substrate, a plating layer made of a metal material and formed on one side of the temperature measuring substrate, electrically connected to the battery cell, through which a charging / discharging current of the battery cell flows, and a temperature measuring pattern which is a conductive pattern and formed on the other side of the temperature measuring substrate, and electrically connected to the temperature sensor provided on the temperature measuring substrate.

[0009] According to one example, the plating layer includes a copper foil plating layer.

[0010] According to another embodiment, the plating layer further includes a nickel and gold plating layer.

[0011] According to yet another example, the plating layer may be formed to allow the charge / discharge current to flow through which the voltage and current of the battery cell are measured.

[0012] According to yet another example, the temperature measurement pattern may be formed such that one end is electrically connected to the temperature sensor and a temperature sensing current for measuring the temperature of the battery cell flows through the one end.

[0013] According to yet another embodiment, the temperature measuring pattern may be provided in a plurality of pieces and may be formed to be electrically connected to a plurality of temperature sensors, respectively.

[0014] According to yet another example, the plating layer may be formed to be electrically connected to the battery cell by wire bonding.

[0015] According to yet another example, the temperature measuring device according to one embodiment of the present invention may further include a fixing rib (lib) provided on one side of the temperature measuring board and having at least one groove configured to be fixed to the protruding fixing portion of the integrated circuit board.

[0016] As a technical means for achieving the above technical object, a battery management system (BMS) including the above temperature measurement device is provided.

[0017] As a technical means for achieving the above technical object, a battery pack including the above battery management system (BMS) is provided. Effect of the Invention

[0018] According to the present invention, a battery temperature measuring device capable of optimizing the assembly process of a battery module can be provided. Also, according to the present invention, a battery temperature measuring device capable of optimizing the assembly space of a battery module by measuring voltage, current, and temperature using one device can be provided. Here, it goes without saying that the scope of the present invention is not limited by such effects. [Brief description of the drawings]

[0019] [Figure 1] 1A and 1B are diagrams for explaining a conventional method for measuring a voltage and a current of a battery cell. [Diagram 2] 1A and 1B are diagrams for explaining a conventional method for measuring a voltage and a current of a battery cell. [Diagram 3] 1A and 1B are diagrams for explaining the necessity of forming a step and manual labor in a conventional battery module assembly process. [Figure 4] 1A and 1B are diagrams for explaining the necessity of forming a step and manual labor in a conventional battery module assembly process. [Diagram 5] 1 is a diagram illustrating a configuration in which a temperature measuring device according to an embodiment of the present invention is mounted on a battery module; [Figure 6] 1 is a diagram illustrating a temperature measurement device according to an embodiment of the present invention; [Figure 7] 2 is a diagram illustrating a schematic diagram of a fixing rib of a temperature measuring device according to an embodiment of the present invention. [Figure 8]1 is a diagram illustrating a configuration in which a temperature measurement device according to an embodiment of the present invention is mounted on an integrated circuit board of a battery management system (BMS). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Prior to that, the terms and words used in the present specification and claims should not be interpreted as being limited to their general or dictionary meanings, but should be interpreted as having meanings and concepts that are consistent with the technical ideas of the present invention, based on the principle that the inventor can appropriately define the concepts of terms in order to best describe his / her invention.

[0021] Therefore, it should be understood that the embodiment described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiment of the present invention and do not represent the technical ideas of the present invention, and therefore, at the time of this application, there may be various equivalents and modifications that can replace them.

[0022] In addition, in the description of the present invention, if it is determined that a detailed description of related publicly known configurations or functions may make the gist of the present invention unclear, the detailed description will be omitted.

[0023] Throughout the specification, when a part "includes" a certain component, it does not mean excluding other components, but also means including other components, unless otherwise specified. Furthermore, throughout the specification, when a part is "connected" to another part, it does not mean only when it is "directly connected" to another part, but also when it is "indirectly connected" through another element between them.

[0024] In this specification, a secondary battery refers to a single independent cell that has a negative terminal and a positive terminal and can be physically separated.

[0025] The battery temperature measuring device according to the present invention is a device for measuring the temperature of a battery. Here, the battery may include one or more secondary batteries. The battery temperature measuring device according to the present invention may measure the temperature of at least one secondary battery among the secondary batteries included in a battery pack. In particular, the battery temperature measuring device according to the present invention may be applied to a battery including one or more lithium secondary batteries. The battery in this case is also a concept including a battery module and a battery pack.

[0026] A battery temperature measuring device according to an embodiment of the present invention may measure the temperature of a secondary battery using a temperature sensor mounted on an integrated circuit board. Here, the integrated circuit board may be configured to contact the electrode leads of the secondary battery. For example, the integrated circuit board may be in direct contact with the electrode leads of the secondary battery. In this case, the integrated circuit board may include a connector configured to be in direct contact with the electrode leads of the secondary battery, and may contact the electrode leads of the secondary battery via the connector.

[0027] Alternatively, the integrated circuit board may be in indirect contact with the electrode leads of the secondary battery. In this case, the integrated circuit board may include a connector configured to be in direct contact with a sensing bus bar that connects the electrode leads of the secondary battery and the integrated circuit board, and may contact the electrode leads of the secondary battery via the sensing bus bar.

[0028] 1 and 2 are diagrams for explaining a conventional method for measuring a voltage and a current of a battery cell, and Figs. 3 and 4 are diagrams for explaining the necessity of step formation and manual work in a conventional battery module assembly process.

[0029] 1, a current tap 10 for measuring the voltage of a battery cell in a conventional battery module is shown. For example, each current tap 10 may be connected to each battery cell and configured to pass a charge / discharge current of each battery cell.

[0030] 2, in a conventional battery module, a temperature sensor 20 for measuring temperature is connected to a wire 25. For example, the temperature sensor 20 may be a thermistor. Also, the wire 25 may be electrically connected to a battery management system (BMS) to measure the temperature of the battery module.

[0031] 1 and 2, in the conventional battery module, the voltage is measured by a structure in which a current tap 10 is attached to a wire 25 connected to a temperature sensor 20. That is, in the conventional battery module, a distinction is made between a structure for measuring temperature and a structure for measuring voltage.

[0032] 3, in a conventional battery module, when the current tap 10 is assembled on the wire 25, the current tap 10 is assembled in a structure in which a step 30 is formed between the current tap 10 and the remaining current tap. In this case, the step 30 may cause assembly defects such as potting not being applied.

[0033] 4, in the conventional battery module, when the wire 25 is assembled, the wire 25 must be manually inserted into the fixing rib 40 in order to fix the wire 25. Also, the space in which the wire 25 is assembled is narrow and small, and there is insufficient space to mount the temperature sensor 20, so that the conventional battery module is mounted with only one temperature sensor 20. This causes a problem that an error occurs in the temperature measurement depending on the position where the temperature is measured.

[0034] Fig. 5 is a diagram illustrating a configuration in which a temperature measuring device according to an embodiment of the present invention is mounted on a battery module, and Fig. 6 is a diagram illustrating a temperature measuring device according to an embodiment of the present invention.

[0035] A temperature measuring device according to an embodiment of the present invention may be mounted on a battery module. Here, the battery module may include a plurality of battery cells. Also, the temperature measuring device according to an embodiment of the present invention may be included in a battery management system (BMS). Also, the temperature measuring device according to an embodiment of the present invention may be included in a battery pack. Also, the temperature measuring device according to an embodiment of the present invention may measure the temperature of the battery cells.

[0036] In a battery module equipped with a temperature measuring device according to one embodiment of the present invention, unlike a conventional battery module, the voltage and temperature of the battery cell do not need to be measured separately, but can be measured at the same time using the temperature measuring device.

[0037] 5 and 6, a temperature measuring device according to an embodiment of the present invention includes a temperature measuring substrate 100, a plating layer 120, and a temperature measuring pattern 110. As shown in FIG.

[0038] The temperature measurement board 100 may be mounted on an integrated circuit board of a battery management system (BMS), and may include a temperature sensor 200.

[0039] The temperature measuring substrate 100 may include a plating layer 120 on one surface (e.g., an upper surface). The temperature measuring substrate 100 may include a temperature measuring pattern 110 on the other surface (e.g., a lower surface). For example, referring to FIG. 6, the plating layer 120 may be made of a metal material and may be formed on one surface of the temperature measuring substrate 100. The plating layer 120 may be electrically connected to a battery cell so that a charging / discharging current of the battery cell flows through the plating layer 120. For example, the plating layer 120 may include a gold (Au) plating layer on the upper surface of the temperature measuring substrate 100. The plating layer 120 may be electrically connected to the battery cell by wire bonding.

[0040] According to an embodiment of the present invention, the plating layer 120 may be formed to pass a charge / discharge current for measuring the voltage and current of a battery cell. For example, the plating layer 120 passes a charge / discharge current of the battery cell, and a battery management system (BMS) may measure a voltage based on the charge / discharge current passing through the plating layer 120. In addition, the battery management system (BMS) may measure a current based on the charge / discharge current passing through the plating layer 120.

[0041] The plating layer 120 according to an embodiment of the present invention may include a copper foil (Cu) plating layer. The plating layer 120 according to an embodiment of the present invention may further include a nickel (Ni) and gold (Au) plating layer. The plating layer 120 according to an embodiment of the present invention may include a copper foil (Cu) and nickel (Ni) and gold (Au) plating layer.

[0042] The temperature measuring pattern 110 is a conductive pattern and may be formed on another surface of the temperature measuring substrate 100. For example, referring to FIG 5, the temperature measuring pattern 110 may be electrically connected to a temperature sensor 200 provided on the temperature measuring substrate 100.

[0043] According to an embodiment of the present invention, the temperature measurement pattern 110 may be formed such that one end is electrically connected to a temperature sensor and a temperature sensing current for measuring the temperature of the battery cell flows through the temperature measurement pattern 110. For example, the temperature measurement pattern 110 may be printed on the temperature measurement substrate 100. Alternatively, the temperature measurement pattern 110 may be embedded in the temperature measurement substrate 100.

[0044] Furthermore, a plurality of temperature measuring patterns 110 according to an embodiment of the present invention may be provided and each may be electrically connected to a plurality of temperature sensors 200. For example, referring to Fig. 5, two temperature measuring patterns 110 according to an embodiment of the present invention may be provided and each may be electrically connected to two temperature sensors 200. In a conventional battery module, only one temperature sensor is provided due to narrow space, but in a battery module according to the present invention, two temperature sensors may be provided due to space optimization.

[0045] Referring to Figures 3 and 5, in the conventional battery module, a step 30 was formed in the current tap 10 due to the space required for installing the wire 25. However, in the battery module according to the present invention, the wire 25 is not installed, and the space of the battery module is optimized, which has the advantage that the step 30 is not formed when the battery module is assembled.

[0046] 4 and 5, in the conventional battery module, a manual process of manually inserting the wire 25 into the fixing rib 40 was required, but in the battery module according to the present invention, the wire 25 is not incorporated, and the assembly process is optimized, which has the effect of eliminating the manual process.

[0047] Fig. 7 is a diagram illustrating a fixing rib 130 of a temperature measuring device according to an embodiment of the present invention, and Fig. 8 is a diagram illustrating a configuration in which a temperature measuring device according to an embodiment of the present invention is mounted on an integrated circuit board of a battery management system (BMS).

[0048] If there is play in the temperature measuring device during the wire bonding process, assembly failure will occur, so it is necessary to use a fixing rib to fix the temperature measuring device.

[0049] The plating layer 120 according to an embodiment of the present invention may be formed to be electrically connected to the battery cell by wire bonding. For example, referring to FIG. 7 and FIG. 8, the temperature measuring device according to an embodiment of the present invention may also include a fixing rib 130.

[0050] For example, the fixing rib 130 may be provided on one side of the temperature measuring substrate 100. For example, referring to Fig. 7, a temperature measuring device according to an embodiment of the present invention may include three fixing ribs 130. For example, one fixing rib 130 may be provided on one end of the temperature measuring substrate 100, and one each on the left and right sides of the longitudinal axis of the temperature measuring substrate 100, for a total of three fixing ribs 130. For example, referring to Figs. 7 and 8, the fixing rib 130 may have at least one groove configured to be fixed to a protruding fixing portion of an integrated circuit substrate.

[0051] As described above, the present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and a person skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom. Therefore, the true technical scope of the present invention is defined by the technical ideas of the claims.

[0052] The above description of the present invention is for illustrative purposes only, and a person having ordinary skill in the art to which the present invention pertains can easily understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and are not limiting. For example, each component described as being single may be implemented in a distributed form, and similarly, each component described as being distributed may be implemented in a combined form.

[0053] The scope of the present invention is defined by the claims rather than the above detailed description, and all modifications and variations that fall within the meaning, scope and equivalent concept of the claims should be construed as being included within the scope of the present invention. [Explanation of symbols]

[0054] 10 Current Taps 20,200 Temperature Sensor 25 Wire 30 steps 40,130 Fixed rib 100 Temperature measurement board 110 Temperature measurement pattern 120 plating layer

Claims

1. In a temperature measuring device for measuring a temperature of a battery cell, a temperature measurement board having a temperature sensor and mounted on the integrated circuit board; a plating layer made of a metal material, formed on one surface of the temperature measuring board, electrically connected to the battery cell, and through which a charging / discharging current of the battery cell flows; a temperature measurement pattern formed on the other surface of the temperature measurement substrate and electrically connected to the temperature sensor provided on the temperature measurement substrate; Temperature measuring device.

2. The temperature measurement device of claim 1 , wherein the plating layer comprises a copper foil plating layer.

3. The temperature measurement device of claim 2 , wherein the plating layer further comprises a nickel and gold plating layer.

4. The temperature measuring device of claim 1 , wherein the plating layer is formed to allow the charge / discharge current to flow through the plating layer, and the voltage and current of the battery cell are measured.

5. The temperature measuring device of claim 1 , wherein one end of the temperature measuring pattern is electrically connected to the temperature sensor so that a temperature sensing current for measuring a temperature of the battery cell flows through the temperature measuring pattern.

6. The temperature measuring device according to claim 5 , wherein the temperature measuring pattern is provided in a plurality of pieces and is formed to be electrically connected to the plurality of temperature sensors, respectively.

7. The temperature measuring device of claim 1 , wherein the plating layer is formed to be electrically connected to the battery cell by wire bonding.

8. The temperature measuring device according to claim 7 , further comprising a fixing rib provided on one side of the temperature measuring board and having at least one groove configured to be fixed to a protruding fixing portion of the integrated circuit board.

9. A battery management system (BMS) comprising a temperature measuring device according to any one of claims 1 to 8.

10. A battery pack comprising the battery management system (BMS) according to claim 9.

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