Battery module

Abstract

An embodiment of the present invention may include a battery module comprising: a case forming the exterior; a battery cell housed inside the case; a circuit unit located between the inner surface of the case and the battery cell, connected to the battery cell to transmit and receive electrical signals; a temperature measuring unit located on one surface of the circuit unit facing the battery cell, measuring the temperature of the battery cell and transmitting temperature information to the circuit unit, and being separated from the battery cell by a predetermined distance; and a holding unit located between the battery cell and the circuit unit.

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0035483 filed on March 17, 2023 and Korean Patent Application No. 10-2024-0036035 filed on March 14, 2024, and all the contents disclosed in the documents of the Korean patent applications are incorporated herein by reference as part of this specification.

[0002] The present invention relates to a battery module in which the structure of a part for measuring the temperature of a battery cell is improved.

Background Art

[0003] Generally, types of secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and lithium-ion polymer batteries. Such secondary batteries are used not only in small products such as digital cameras, P-DVDs, MP3Ps, mobile phones, PDAs, portable game devices, power tools, and electric bicycles, but also in large products that require high power such as electric vehicles and hybrid vehicles, power storage devices for storing surplus generated power and new renewable energy, and backup power storage devices.

[0004] To manufacture such secondary batteries, first, an electrode active material slurry is applied to a positive electrode current collector and a negative electrode current collector to manufacture a positive electrode and a negative electrode, and these are laminated on both sides of a separator to form an electrode assembly of a predetermined shape. Then, the electrode assembly is housed in a battery case, electrolyte is injected, and then it is sealed.

[0005] A battery module can be manufactured by housing multiple such secondary batteries in a case. During the manufacturing and use of the battery module, temperature control within the module is one of the essential management requirements. This is because checking the internal temperature of the battery module allows for the prediction and response to damage and failures to the internal components of the battery module.

[0006] Specifically, external environmental factors or internal defects can cause damage or failure to the battery cells housed within the battery module. Damage and degradation of the battery cells can lead to a phenomenon called swelling. Such swelling can cause secondary problems, such as degrading the performance of the battery module or affecting other surrounding components.

[0007] Therefore, there is a need for battery modules that can effectively sense the temperature inside the battery module and prevent secondary problems caused by deformation of the battery cells. Furthermore, there is a need for battery modules where the temperature sensing component is not subjected to external forces, even if the battery cells experience swelling. [Overview of the project] [Problems that the invention aims to solve]

[0008] One problem that this invention aims to solve is to provide a battery module that prevents damage to the temperature measuring unit or malfunction due to internal structural deformation. [Means for solving the problem]

[0009] An embodiment of the present invention may include a battery module comprising: a case forming the exterior; a battery cell housed inside the case; a circuit unit located between the inner surface of the case and the battery cell, connected to the battery cell to transmit and receive electrical signals; a temperature measuring unit located on one surface of the circuit unit facing the battery cell, measuring the temperature of the battery cell and transmitting temperature information to the circuit unit, and being separated from the battery cell by a predetermined distance; and a holding unit located between the battery cell and the circuit unit.

[0010] The circuit section may include a circuit body connected to the inner surface of the case, and a bent portion, one end of which is connected to the circuit body and which bends toward the battery cell.

[0011] The temperature measuring unit can be connected to one of the surfaces of the bent portion facing the battery cell.

[0012] The bent portion is formed by recessing from the circuit body, and an extra space can be created between the bent portion and the circuit body.

[0013] The temperature measuring unit is movable into the extra space.

[0014] With only one end of the bent portion connected to the circuit body, the other end of the bent portion can be separated from the circuit body.

[0015] The holding portion is located between the battery cell and the bent portion and can be attached to the battery cell and the bent portion.

[0016] The holding portion can be connected to one surface of the bent portion to which the temperature measuring portion is connected.

[0017] As the holding portion is pushed outward by the battery cell, the temperature measuring portion can move in a direction parallel to the direction in which the holding portion is pushed out.

[0018] One surface of the bent portion to which the temperature measurement portion and the holding portion are connected may include a flat surface.

[0019] A plurality of the bent portions can be formed.

[0020] A plurality of the holding portions are provided, and the temperature measurement portion can be located between the plurality of holding portions.

[0021] The plurality of holding portions and the temperature measurement portion are located on one surface of the bent portion facing the battery cell, and at least one of the plurality of holding portions can be located closer to the connection portion of the circuit main body and the bent portion than the temperature measurement portion.

[0022] The holding portion is located on one surface of the circuit portion where the temperature measurement portion is located, and the circuit portion and the temperature measurement portion can be separated from the battery cell by a predetermined distance.

[0023] The temperature measurement portion is movable in a direction away from the battery cell.

Advantages of the Invention

[0024] According to a preferred embodiment of the present invention, it is possible to prevent the temperature measurement portion from being damaged or malfunctioning due to internal structural deformation, and to extend the performance and lifespan of the battery module.

[0025] In addition, it can include effects that can be easily predicted by those skilled in the art from the configuration according to the preferred embodiment of the present invention.

Brief Description of the Drawings

[0026] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention to be described later, serve to further understand the technical idea of the present invention. The present invention should not be construed as being limited only to the matters described in such drawings.

[0027] [Figure 1] It is a perspective view of a battery module according to an embodiment of the present invention. [Figure 2] It is a perspective view of a battery module from which a case according to an embodiment of the present invention has been removed. [Figure 3] It is a perspective view of a bus bar assembly according to an embodiment of the present invention. [Figure 4] It is an enlarged view of the P region in FIG. 3 as seen from above. [Figure 5] It is an internal cross-sectional view of a battery module according to an embodiment of the present invention. [Figure 6] It is an enlarged view of the P region in FIG. 3 as seen from below. [Figure 7] It is an exploded view of a battery module according to still another embodiment of the present invention. [Figure 8] It is a cross-sectional view of a battery module according to still another embodiment of the present invention.

Mode for Carrying Out the Invention

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention can be realized in various different forms and is not limited or restricted by the following embodiments.

[0029] In order to clearly explain the present invention, detailed descriptions of parts that have no relation to the explanation or of related known technologies that may obscure the gist of the present invention are omitted, and when assigning reference numerals to the components of each drawing in this specification, the same or similar reference numerals are assigned to the same or similar components throughout the specification.

[0030] Furthermore, the terms and words used in this specification and in the claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather should be interpreted in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors may define the concepts of terms as appropriate to best describe their invention.

[0031] Figure 1 is a perspective view of a battery module 1 according to an embodiment of the present invention, and Figure 2 is a perspective view of the battery module 1 with a portion of the case 10 according to an embodiment of the present invention removed.

[0032] Referring to Figures 1 and 2, a battery module 1 according to an embodiment of the present invention houses a configuration in which electrodes are stacked to store electrical energy and, depending on the design and requirements, can output the stored electrical energy to the outside. The battery module 1 can sense and measure the heat generated internally during the process of storing and outputting electrical energy. For example, the battery module 1 may be equipped with a temperature sensor to sense and measure non-ideal changes in internal temperature, such as phenomena like heat generation and swelling due to increased resistance of the battery cells. In addition, the battery module 1 may include a structure to protect the configuration that senses and measures the internal temperature.

[0033] Specifically, the battery module 1 may include a case 10, a battery cell 11, a busbar assembly 12, and a retaining part 13.

[0034] The case 10 can form the exterior of the battery module 1. In other words, the case 10 can have a form that encloses the outside of the housing space while forming a housing space inside. With such a structure, the case 10 can house each component necessary for the battery function inside and protect each component from the external environment.

[0035] The battery cell 11 can store electrical energy and, depending on the design and requirements, can output the stored electrical energy. For example, the battery cell 11 can be housed inside the case 10 and electrically connected to a busbar assembly 12 (described later), allowing the stored energy to be output externally via the busbar assembly 12.

[0036] Figure 3 is a perspective view of a busbar assembly 12 according to an embodiment of the present invention.

[0037] Referring to Figure 3, the busbar assembly 12 can be electrically connected to the battery cell 11. For example, the busbar assembly 12 can be connected to the battery cell 11 and function as a conduit for electrical energy. The busbar assembly 12 can also transmit electrical signals necessary for controlling the battery cell 11 to the battery cell 11, or transmit electrical signals generated from the battery cell 11 to the control configuration. In this case, the control configuration can sense electrical problems such as overcurrents via the busbar assembly 12, and prevent problems such as damage and breakage of the battery cell 11.

[0038] Furthermore, the busbar assembly 12 can structurally connect the battery cells 11. For example, in order for the battery module 1 to achieve an output and capacity above a predetermined level, a large number of battery cells 11 must be connected in parallel or in series, and the busbar assembly 12 can be used to structurally connect a large number of battery cells 11.

[0039] The busbar assembly 12 may include a busbar frame 122, a circuit section 120, and a temperature measuring section 121.

[0040] The busbar frame 122 can be connected to the battery cell 11. For example, the busbar frame 122 can be connected to the battery cell 11 so as to be parallel to the longitudinal direction of the battery cell 11, and can include a configuration that encloses the battery cell 11. That is, the busbar frame 122 can be connected to the battery cell 11 so as to enclose a portion of the battery cell 11, including both ends of the battery cell 11, so as to be electrically connected to both terminals of the battery cell 11 via busbars. With such a structure, multiple battery cells 11 can be fastened together and formed as a single unit by the busbar frame 122.

[0041] The circuit section 120 is coupled to the busbar assembly 12 and electrically connected to the battery cell 11, enabling it to send and receive electrical signals. For example, through holes are formed on the inside of the busbar frame 122, and the circuit section 120 can be fitted into the through holes in the busbar frame 122 or coupled by tape. That is, the circuit section 120 can be coupled to the busbar frame 122 so that it is positioned between the inner surface of the case 10 and the battery cell 11. In addition, a portion of the circuit section 120 can be formed to protrude toward the battery cell 11. Depending on changes in the size or volume of the battery cell 11, a portion of the circuit section 120 is movable.

[0042] Figure 4 is an enlarged view of the P region in Figure 3 as seen from above, Figure 5 is an internal cross-sectional view of a battery module according to an embodiment of the present invention, and Figure 6 is an enlarged view of the P region in Figure 3 as seen from below.

[0043] Referring to Figures 4 to 6, the circuit section 120 may include the circuit body 1200 and the bent portion 1201.

[0044] The circuit body 1200 can be connected to the inner surface of the case 10. The circuit body 1200 is the part that forms the edge of the circuit section 120 and, as described above, can be inserted into a through hole formed on the inside of the busbar frame 122 or joined by tape. For example, the through hole on the inside of the busbar frame 122 can be formed along the longitudinal direction of the battery cell 11, and the circuit body 1200 can also be positioned along the longitudinal direction of the battery cell 11.

[0045] The bent portion 1201 can be connected to the circuit body 1200 on one side and bent toward the battery cell 11. For example, the bent portion 1201 can include a shape that protrudes toward the battery cell 11 while connected to the circuit body 1200 in a bent shape. That is, while only one end of the bent portion 1201 is connected to the circuit body 1200, the other end of the bent portion 1201 can be separated from the circuit body 1200. In other words, one side of the bent portion 1201 can be connected to the circuit body 1200 in a bent shape, and the bent portion 1201 can be formed extending from one side of the bent portion 1201 so that the other side of the bent portion 1201 is separated from the circuit body 1200.

[0046] Specifically, the bent portion 1201 can be formed by recessing from the circuit body 1200. For example, the circuit body 1200 may include a portion that penetrates inward, and when viewed from above, the bent portion 1201 may be located in the portion of the circuit body 1200 that penetrates inward. That is, the bent portion 1201 may be formed protruding from the circuit body 1200 toward the battery cell 11 so as to be located below the portion of the circuit body 1200 that penetrates inward.

[0047] As a more specific example, the bent portion 1201 can have a shape similar to the uppercase letter L in English. In the L shape, the horizontal portion may be longer and the vertical portion may be shorter. Also, the portion corresponding to the vertical portion in the L shape may have an inclined shape.

[0048] Furthermore, an extra space S can be formed between the bent portion 1201 and the circuit body 1200. In other words, an extra space S can be formed between the extended surface of the circuit body 1200 with respect to the through-formed portion and the bent portion 1201.

[0049] The temperature measuring unit 121 can measure the temperature of the battery cell 11 and transmit the temperature information to the circuit unit 120. For example, the temperature measuring unit 121 can measure the temperature of the battery cell 11 by including at least one temperature sensing device such as an RTD (Resistance Thermometer Detector), a thermocouple, and a thermistor. In other words, the temperature measuring unit 121 can convert the temperature of the battery cell 11 into an electrical signal and transmit it to the circuit unit 120.

[0050] The temperature measuring unit 121 can be located on one side of the circuit section 120 facing the battery cell 11. For example, the temperature measuring unit 121 can be connected to one side of the bent portion 1201 facing the battery cell 11. That is, with respect to the bent portion 1201, the extra space S and the temperature measuring unit 121 can be located on both sides of the bent portion 1201. In other words, the extra space S can be formed above the bent portion 1201, and the temperature measuring unit 121 can be connected to the lower surface of the bent portion 1201.

[0051] The temperature measuring unit 121 can be separated from the battery cell 11 by a predetermined distance. That is, the temperature measuring unit 121 can be kept from contacting the battery cell 11. In this case, the temperature measuring unit 121 can move away from the battery cell 11. For example, if the temperature measuring unit 121 is separated from the battery cell 11 by a predetermined distance, and a phenomenon occurs that causes the battery cell 11 to expand, bringing it closer to the temperature measuring unit 121, the temperature measuring unit 121 can move away from the battery cell 11. Here, the temperature measuring unit 121 can move towards the extra space S. More specific phenomena and structures will be described later, along with the explanation of the holding unit 13.

[0052] The retaining portion 13 can be positioned between the battery cell 11 and the circuit portion 120. The retaining portion 13 is positioned between the battery cell 11 and the circuit portion 120, and both sides of the retaining portion 13 can be connected to the battery cell 11 and the circuit portion 120, respectively. For example, the retaining portion 13 may include a pad material and be attached to the battery cell 11 and the circuit portion 120.

[0053] Specifically, the holding portion 13 is located between the battery cell 11 and the bent portion 1201 and can be attached to the battery cell 11 and the bent portion 1201. With this structure, the holding portion 13 can separate the circuit portion 120 and the temperature measuring portion 121 from the battery cell 11 at a predetermined distance.

[0054] The holding portion 13 can be located on one surface of the circuit portion 120 where the temperature measuring portion 121 is located. That is, the holding portion 13 and the temperature measuring portion 121 can be located on the same plane as the circuit portion 120. Specifically, the holding portion 13 can be connected to one surface of the bent portion 1201 to which the temperature measuring portion 121 is connected. In this case, the distance between the two surfaces of the holding portion 13 to which the battery cell 11 and the circuit portion 120 are connected can be made longer than the distance between one surface of the temperature measuring portion 121 to which the circuit portion 120 is connected and the other surface of the temperature measuring portion 121 facing the battery cell 11. In other words, when viewed from the side, the height of the holding portion 13 can be made higher than the height of the temperature measuring portion 121.

[0055] With this structure, the holding part 13 can maintain a constant distance between the temperature measuring part 121 and the battery cell 11. Furthermore, as the holding part 13 is pushed outward by the battery cell 11, the temperature measuring part 121 can move in a direction parallel to the direction in which the holding part 13 is pushed out. That is, when the temperature measuring part 121 is positioned at a predetermined distance from the battery cell 11 and the battery cell 11 expands due to the swelling phenomenon, the holding part 13 is pushed along the battery cell 11. The holding part 13, receiving an external force from the battery cell 11, acts to push the bent portion 1201, and the temperature measuring part 121, which is connected to the bent portion 1201 that receives an external force from the holding part 13, is also pushed along the holding part 13. As a result, regardless of the volume change of the battery cell 11, the temperature measuring part 121 can always maintain a predetermined distance from the battery cell 11.

[0056] One surface of the bent portion 1201 to which the temperature measuring section 121 and the holding section 13 are connected may include a flat surface. For example, one surface of the bent portion 1201 to which the temperature measuring section 121 and the holding section 13 are connected may be formed flat and positioned parallel to one surface of the battery cell 11 facing the circuit section 120.

[0057] Multiple holding parts 13 are provided, and the temperature measuring part 121 can be positioned between the multiple holding parts 13. In other words, the multiple holding parts 13 and the temperature measuring part 121 can be positioned on one surface of the bent portion 1201 facing the battery cell 11. In this case, at least one of the multiple holding parts 13 can be positioned closer to the temperature measuring part 121 than to the connecting portion between the circuit body 1200 and the bent portion 1201.

[0058] With this structure, the circuit section 120 does not come into contact with the battery cell 11 without a notch structure, maintaining a predetermined distance from all parts of the battery cell 11, and the temperature measuring section 121 is positioned between the multiple holding sections 13, thereby better preventing damage and breakage of the temperature measuring section by the battery cell 11.

[0059] If an overcurrent exceeding the limit flows through the battery cell 11, if the battery cell 11 is damaged by an external force, or if the electrolyte undergoes an abnormal decomposition reaction, the temperature of the battery cell 11 may rise rapidly, and an accident may occur in which the battery cell 11 expands and explodes due to the rapidly rising temperature. To prevent this, the temperature measuring unit 121 senses the temperature of the battery cell 11 in real time and transmits an electrical signal to the control configuration via the circuit unit 120. Due to the structural features of the circuit unit 120 and the holding unit 13 as described above, the temperature measuring unit 121 can sense the temperature of the battery cell 11 more stably.

[0060] Furthermore, by designing a structure in which only one end of the bent portion 1201 is connected to the circuit body 1200, and the other end of the bent portion 1201 and the temperature measuring section 121 are movable into the extra space S, the bent portion 1201 can be incorporated in a structure that provides better buffering against the swelling phenomenon of the battery cell 11. In other words, when only one end of the bent portion 1201 is connected to the circuit body 1200 compared to when both ends of the bent portion 1201 are connected, the buffering effect of the bent portion 1201 and the holding portion 13 can be increased.

[0061] As a result, the structural stability and measurement accuracy of the temperature measuring unit 121 are increased, which further ensures the performance of the battery module 1 and extends its lifespan.

[0062] The following describes battery module 1 of the present invention according to other embodiments. Specifically, an embodiment in which multiple of the above-described bent portions 1201 are provided will be described. However, explanations that overlap with the above will be omitted below.

[0063] In other embodiments of the present invention, the battery module 1 may include a plurality of bent portions 1201. It may also include a plurality of holding portions 13 and a plurality of temperature measuring portions 121 connected to each of the plurality of bent portions 1201. With such a structure, if swelling occurs partially in each part of the battery cell 11, the battery module 1 can more effectively prevent damage to the temperature measuring portion 121 due to swelling by having each bent portion 1201 and temperature measuring portion 121 located corresponding to each part of the battery cell 11 where the swelling occurs. Furthermore, the battery module 1 can sense the temperature of each part of the battery cell 11 where the problem occurs, identify the part or component of the battery cell 11 causing the problem, and more effectively prevent secondary damage caused by the swelling phenomenon.

[0064] Furthermore, the following describes battery module 2 of the present invention according to yet another embodiment. Specifically, battery module 2 of the present invention according to yet another embodiment can be formed in a U-frame structure, unlike battery module 1 of the present invention according to the above-described embodiment. Some parts of the description that overlap with the contents of battery module 1 of the present invention according to the above-described embodiment will be omitted below.

[0065] Figure 7 is an exploded view of a battery module 2 according to yet another embodiment of the present invention, and Figure 8 is a cross-sectional view of a battery module 2 according to yet another embodiment of the present invention.

[0066] Referring to Figures 7 and 8, the battery module 2 may include a case 20, a battery cell 21, a circuit section 220, a temperature measuring section 221, and a holding section 23.

[0067] The case 20 can form the external appearance of the battery module 2. In other words, the case 20 includes a shape that forms an internal housing space and surrounds the outside of the housing space, and can house the components necessary for the battery function inside.

[0068] Specifically, the case 20 may include a U-frame 200 forming the bottom and sides, end plates 201 covering the front and rear surfaces of the U-frame 200, and a cover plate 202 covering the upper side of the U-frame 200 and end plates 201 to seal the internal storage space.

[0069] The battery cell 21 can store electrical energy and, as designed and required, can output the stored electrical energy. The battery cell 21 can be housed inside the case 20.

[0070] The circuit unit 220 is connected to the inner surface of the case 20 and can send and receive electrical signals from the temperature measuring unit 221, which will be described later. For example, the circuit unit 220 can be located between the case 20 and the battery cell 21. That is, the circuit unit 220 can be located below the cover plate 201 and between the cover plate 201 and the battery cell 21.

[0071] Furthermore, a portion of the circuit section 220 may be formed to protrude toward the battery cell 21. Depending on changes in the size or volume of the battery cell 21, a portion of the circuit section 220 may be movable. For example, the circuit section 220 may include a circuit body 2200 and a bent portion 2201.

[0072] The circuit body 2200 can be connected to the inner lower surface of the cover plate 201. One side of the bent portion 2201 is connected to the circuit body 2200, and the other side of the bent portion 2201 can be formed in a curved shape toward the battery cell 21. Specifically, the bent portion 2201 can be formed by recessing from the circuit body 2200. An extra space S can be formed between the bent portion 2201 and the circuit body 2200.

[0073] The temperature measuring unit 221 can measure the temperature of the battery cell 21 and transmit the temperature information to the circuit unit 220. In other words, the temperature measuring unit 221 can convert the temperature of the battery cell 21 into an electrical signal and transmit it to the circuit unit 220.

[0074] The temperature measuring unit 221 can be located on one side of the circuit section 220 facing the battery cell 21. For example, the temperature measuring unit 221 can be connected to one side of the bent section 2201 facing the battery cell 21.

[0075] The temperature measuring unit 221 can be separated from the battery cell 21 by a predetermined distance. That is, the temperature measuring unit 221 can be kept from contacting the battery cell 21. In this case, the temperature measuring unit 221 is movable in a direction away from the battery cell 21.

[0076] Specifically, the holding portion 23 can be positioned between the battery cell 21 and the circuit portion 220. The holding portion 23 is positioned between the battery cell 21 and the circuit portion 220, and both sides of the holding portion 23 can be connected to the battery cell 21 and the circuit portion 220, respectively. The holding portion 23 is positioned between the battery cell 21 and the bent portion 2201, and can be attached to the battery cell 21 and the bent portion 2201. With such a structure, the holding portion 23 can separate the circuit portion 220 and the temperature measuring portion 221 from the battery cell 21 at a predetermined distance.

[0077] The above description is merely illustrative of the technical concept of the present invention, and any person with ordinary skill in the art to which the present invention belongs can make various modifications and alterations without departing from the essential characteristics of the present invention.

[0078] Therefore, the embodiments disclosed in this invention are for illustrative purposes only and not to limit the technical concept of the invention, and the scope of the technical concept of the invention is not limited by such embodiments.

[0079] The scope of protection of this invention shall be interpreted in accordance with the following claims, and all technical ideas within an equivalent scope shall be interpreted as being included within the scope of the rights of this invention. [Explanation of Symbols]

[0080] 1 Battery Module 10 cases 11 battery cells 12 Busbar Assembly 120 Circuit section 121 Temperature measurement section 122 Busbar Frame 1200 Circuit Body 1201 Bent part 13 Holding part S Extra space

Claims

1. The case that forms the exterior, A battery cell housed inside the aforementioned case, A circuit section located between the inner surface of the case and the battery cell, connected to the battery cell, for transmitting and receiving electrical signals, A temperature measuring unit is located on one side of the circuit section facing the battery cell, measures the temperature of the battery cell and transmits the temperature information to the circuit section, and is separated from the battery cell by a predetermined distance. A battery module including a holding portion located between the battery cell and the circuit portion.

2. The aforementioned circuit section is The circuit body is connected to the inner surface of the case, The battery module according to claim 1, comprising a bent portion that is connected to the circuit body on one side and bends toward the battery cell.

3. The battery module according to claim 2, wherein the temperature measuring unit is connected to one surface of the bent portion facing the battery cell.

4. The battery module according to claim 3, wherein the bent portion is formed by recessing from the circuit body, and an extra space is formed between the bent portion and the circuit body.

5. The battery module according to claim 4, wherein the temperature measuring unit is movable into the extra space.

6. The battery module according to claim 4, wherein only one end of the bent portion is connected to the circuit body, and the other end of the bent portion is separated from the circuit body.

7. The battery module according to claim 3, wherein the holding portion is located between the battery cell and the bent portion and is attached to the battery cell and the bent portion.

8. The battery module according to claim 7, wherein the holding portion is connected to one surface of the bent portion to which the temperature measuring portion is connected.

9. The battery module according to claim 8, wherein the holding portion is pushed outward by the battery cell, causing the temperature measuring portion to move in a direction parallel to the direction in which the holding portion is pushed out.

10. The battery module according to claim 8, wherein one surface of the bent portion to which the temperature measuring portion and the holding portion are connected includes a flat surface.

11. The battery module according to claim 2, wherein multiple bent portions are formed.

12. The battery module according to claim 2, wherein a plurality of the holding parts are provided, and the temperature measuring part is located between the plurality of holding parts.

13. The plurality of holding parts and temperature measuring parts are located on one surface of the bent portion facing the battery cell, The battery module according to claim 12, wherein at least one of the plurality of holding portions is located closer to the temperature measuring portion than the connecting portion between the circuit body and the bent portion.

14. The battery module according to claim 1, wherein the holding portion is located on one surface of the circuit portion on which the temperature measuring portion is located, and the circuit portion and the temperature measuring portion are separated from the battery cell by a predetermined distance.

15. The battery module according to claim 14, wherein the temperature measuring unit is movable in a direction away from the battery cell.

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