Battery assembly

Abstract

The present invention relates to a battery assembly. The battery assembly according to one embodiment of the present invention comprises: a battery cell; a circuit board coupled to the battery cell so as to be electrically connected to the battery cell; a chip thermistor which senses the temperature of the battery cell and which is electrically connected to the circuit board; and a first bus bar which extends between an anode of the battery cell and the circuit board so as to electrically connect the anode of the battery cell and the circuit board, and which is electrically connected to the chip thermistor.

Description

Battery assembly

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0184991, dated December 18, 2023, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a battery assembly.

[0005] Among the batteries used in e-cigarette battery packs, 1T1S batteries pose cell safety issues. Battery packs for laptops and vacuum cleaners that use gauge ICs typically include a permanent failure function that permanently disables the battery if an internal problem, such as overcurrent or overtemperature, is detected.

[0006] However, current e-cigarette battery packs only feature overcharge, overdischarge, and overcurrent protection without a gauge IC, allowing consumers to use the battery cells without any time restrictions. Long-term use can lead to cell deterioration, which can lead to internal short-circuits and even explosions.

[0007] In the case of battery cells that exhibit abnormal behavior, the temperature of the battery cell rises rapidly during charging / discharging in the event of an internal short circuit. Therefore, to prevent this, a battery assembly capable of seamlessly monitoring the cell temperature and cutting off the current circuit in the event of an abnormal condition is required.

[0008] The background technology described above is something that the inventor possessed or acquired in the process of deriving the disclosure of the present application, and cannot necessarily be said to be a publicly known technology disclosed to the general public prior to the present application.

[0009] The present invention has been devised to solve the above problems,

[0010] An object of one embodiment of the present invention is to provide a battery assembly capable of efficiently sensing the temperature of a battery cell.

[0011] An object of one embodiment of the present invention is to provide a battery assembly capable of improving safety by efficiently shutting off a charge / discharge circuit when an abnormal temperature occurs in a battery cell.

[0012] A battery assembly according to one embodiment of the present invention may include a battery cell, a circuit board coupled to the battery cell to be electrically connected to the battery cell, a chip thermistor configured to sense a temperature of the battery cell and electrically connected to the circuit board, and a first bus bar extending between the negative electrode of the battery cell and the circuit board to electrically connect the negative electrode of the battery cell and the circuit board, and electrically connected to the chip thermistor.

[0013] The battery assembly may further include a second bus bar extending between the chip thermistor and the circuit board to electrically connect the chip thermistor and the circuit board, and spaced apart from the first bus bar.

[0014] The above chip thermistor is arranged between the first bus bar and the second bus bar to electrically connect the first bus bar and the second bus bar.

[0015] The first bus bar and the second bus bar may have different widths.

[0016] The above first bus bar may have a thicker width than the above second bus bar.

[0017] The first busbar may include a busbar body extending from a negative electrode of the battery cell, and a busbar arm extending from an end of the busbar body toward the circuit board and having a width smaller than the busbar body.

[0018] The above chip thermistor can connect the above busbar arm and the second busbar.

[0019] The above battery cell has a cylindrical shape having a longitudinal direction, and the circuit board can be coupled to one longitudinal end of the battery cell.

[0020] The above chip thermistor can be placed spaced apart from both longitudinal ends of the battery cell.

[0021] The above chip thermistor may be located at the longitudinal center portion of the battery cell.

[0022] The above battery assembly may further include a blocking unit configured to block current based on temperature data of the battery cell sensed from the chip thermistor.

[0023] The above-mentioned blocking unit may further include a first blocking unit coupled to the bus bar arm to open and block current when the temperature of the battery cell exceeds a preset reference temperature.

[0024] The above first blocking unit can connect the bus bar arm and the circuit board.

[0025] The above-mentioned blocking unit may further include a second blocking unit coupled to the circuit board so as to be electrically connected to the circuit board, and configured to receive a signal from the circuit board and block current when the temperature change rate of the battery cell exceeds a preset reference temperature change rate.

[0026] A battery assembly according to one embodiment of the present invention can efficiently sense the temperature of a battery cell.

[0027] A battery assembly according to one embodiment of the present invention can improve safety by efficiently shutting off a charge / discharge circuit when an abnormal temperature occurs in a battery cell.

[0028] In addition, the configurations according to the embodiments of the present invention may include effects that can be easily predicted by those skilled in the art.

[0029] Figure 1 is a front view schematically showing the form of a battery assembly according to a comparative example of the present invention.

[0030] Fig. 2 is a plan view showing the connection of a circuit board and a bus bar of a battery assembly according to a comparative example of the present invention.

[0031] Figure 3 is a front view showing a schematic structure of a battery assembly according to Example 1 of the present invention.

[0032] FIG. 4 is a plan view showing the connection form of a bus bar and a circuit board of a battery assembly according to Example 1 of the present invention.

[0033] Figure 5 shows an exploded perspective view of a battery assembly according to Example 1 of the present invention.

[0034] FIG. 6 is a schematic circuit diagram showing the electrical connection structure of a battery assembly according to Embodiment 1 of the present invention.

[0035] Figure 7 is a front view showing a schematic structure of a battery assembly according to Embodiment 2 of the present invention.

[0036] Figure 8 is a flowchart showing a current blocking mechanism of a battery assembly according to Embodiment 2 of the present invention.

[0037] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. The following description is one of several aspects of the embodiments, and in describing one embodiment, detailed descriptions of well-known functions or configurations will be omitted to clarify the gist of the present invention.

[0038] In this specification, when adding reference signs to components in each drawing, the same or similar reference signs are attached to identical or similar components throughout the specification. Components included in one embodiment and components that have common functions will be described using the same names in other embodiments. Terms or words used in this specification and the claims should not be interpreted as limited to their usual or dictionary meanings, and should be interpreted as meanings and concepts that are consistent with the technical spirit of the present invention based on the principle that the inventor can appropriately define the concept of the term to best explain his or her invention.

[0039] Furthermore, the present invention is not limited to the embodiments described above, and those skilled in the art will readily appreciate that various modifications and variations can be made based on this disclosure. Therefore, the spirit of the present invention should not be construed as limited to the embodiments described above, and all variations equivalent to or equivalent to the claims, as well as the scope of the claims, are deemed to fall within the scope of the present invention.

[0040] Comparative example

[0041] Figures 1 and 2 illustrate a battery assembly according to a comparative example of the present invention. Specifically, Figure 1 is a front view schematically illustrating a battery assembly according to a comparative example of the present invention, and Figure 2 is a plan view illustrating the connection between a circuit board (20) and a bus bar (30) of a battery assembly according to a comparative example of the present invention.

[0042] Referring to FIGS. 1 and 2, a battery assembly according to a comparative example of the present invention may include a battery cell (10), a circuit board (20), and a bus bar (30).

[0043] The battery cell (10) may be provided in a cylindrical shape having a longitudinal direction. The battery cell (10) may have a positive electrode (101) and a negative electrode (102). The positive electrode (101) and the negative electrode (102) of the battery cell (10) may be formed at opposite ends in the longitudinal direction of the cylindrical battery cell (10). For example, the positive electrode (101) may be formed at the upper end of the battery cell (10), and the negative electrode (102) may be formed at the lower end of the battery cell (10). The positive electrode (101) and the negative electrode (102) of the battery cell (10) may be electrically connected to a circuit board (20), respectively.

[0044] A circuit board (20) may be coupled to a battery cell (10) so as to be electrically connected to the battery cell (10). The circuit board (20) may be coupled to one longitudinal end of the battery cell (10). For example, the circuit board (20) may be coupled to a longitudinal end of the battery cell (10) where a positive electrode (101) is formed. The circuit board (20) may be electrically connected to both the positive electrode (101) and the negative electrode (102) of the battery cell (10). For example, the circuit board (20) may be electrically connected to the positive electrode (101) of the battery cell (10) by overlapping the positive electrode (101) of the battery cell (10) and may be electrically connected to the negative electrode (102) of the battery cell (10) via a bus bar (30) to be described later. The circuit board (20) can be electrically connected to the battery cell (10) to check and control the electrical status of the battery cell (10).

[0045] A bus bar (30) may be provided to electrically connect the negative electrode (102) of the battery cell (10) and the circuit board (20). The bus bar (30) may be provided in the form of a conductive plate extending along the longitudinal direction of the battery cell (10). One longitudinal end of the bus bar (30) may be connected to the circuit board (20), and a negative electrode plate (302) formed to be in contact with and electrically connected to the negative electrode (102) of the battery cell (10) may be provided at the other longitudinal end of the bus bar (30).

[0046] In the case of a battery assembly according to a comparative example of the present invention, a temperature sensing member such as a chip thermistor, for example, a chip NTC (Negative Temperature Coefficient) thermistor, may be provided in a form built into a circuit board (20) to sense the temperature of a battery cell (10). In this case, there is a limitation that accurate temperature acquisition is not possible due to the distance between the longitudinal center portion of the battery cell (10) where the highest temperature of heat generation is generated and the thermistor that senses the temperature, and there is also a limitation that the current circuit cannot be cut off when overheating occurs, which may lead to a stability issue of the battery.

[0047] Example 1

[0048] Figures 3 to 5 illustrate a battery assembly according to Embodiment 1 of the present invention. Specifically, Figure 3 is a front view schematically illustrating the structure of a battery assembly according to Embodiment 1 of the present invention, and Figure 4 is a plan view illustrating the connection structure of a bus bar (30) and a circuit board (20) of a battery assembly according to Embodiment 1 of the present invention. Figure 5 is an exploded perspective view of a battery assembly according to Embodiment 1 of the present invention.

[0049] The configurations of the battery assembly according to Embodiment 1 of the present invention illustrated in FIGS. 3 to 5 are schematically illustrated for convenience of explanation, and it is to be noted in advance that the shape and arrangement of each configuration are not limited to those illustrated.

[0050] Referring to FIGS. 3 and 4, a battery assembly according to Embodiment 1 of the present invention may include a battery cell (10), a circuit board (20), a bus bar (30), and a chip thermistor (40).

[0051] The battery cell (10) may be provided in a cylindrical shape having a longitudinal direction. The battery cell (10) may have a positive electrode (101) and a negative electrode (102). The positive electrode (101) and the negative electrode (102) of the battery cell (10) may be formed at opposite ends in the longitudinal direction of the cylindrical battery cell (10). For example, the positive electrode (101) may be formed at the upper end of the battery cell (10), and the negative electrode (102) may be formed at the lower end of the battery cell (10). The positive electrode (101) and the negative electrode (102) of the battery cell (10) may be electrically connected to a circuit board (20), respectively.

[0052] A circuit board (20) may be coupled to a battery cell (10) so as to be electrically connected to the battery cell (10). The circuit board (20) may be a printed circuit board (PCB) configured to electrically control the state of the battery cell (10). The circuit board (20) may form at least a portion of a battery management system (BMS). The circuit board (20) may be configured to include a micro control unit (MCU), as will be described later. The circuit board (20) may be provided in the form of a plate having a predetermined thickness, and may be coupled to one end of the battery cell (10) in the longitudinal direction.

[0053] The circuit board (20) may be coupled to, for example, a longitudinal end of a battery cell (10) where a positive electrode (101) is formed. The circuit board (20) may be electrically connected to both the positive electrode (101) and the negative electrode (102) of the battery cell (10). For example, the circuit board (20) may be electrically connected by directly contacting the positive electrode (101) of the battery cell (10) by overlapping the positive electrode (101) of the battery cell (10), and may be electrically connected to the negative electrode (102) of the battery cell (10) via a first bus bar (31) to be described later. The circuit board (20) may be electrically connected to the battery cell (10) to perform a function of checking and controlling the electrical state of the battery cell (10).

[0054] The bus bar (30) may include a first bus bar (31). The first bus bar (31) may be provided to electrically connect the negative electrode (102) of the battery cell (10) and the circuit board (20). The first bus bar (31) may be provided in the form of a conductive plate extending along the longitudinal direction of the battery cell (10). The first bus bar (31) may be a plate formed of, for example, nickel. One longitudinal end of the first bus bar (31) may be connected to the circuit board (20), and a negative electrode plate (302) formed to be in contact with and electrically connected to the negative electrode (102) of the battery cell (10) may be provided at the other longitudinal end of the first bus bar (31). The first bus bar (31) may be in contact with and electrically connected to a chip thermistor (40) to be described later.

[0055] The first bus bar (31) connects the negative electrode of the battery cell (10) and the circuit board (20), and since a large amount of current flows through it, it can be designed to have a thicker width than the second bus bar (32) described later.

[0056] The first busbar (31) may include a busbar body (311) and a busbar arm (312). The busbar body (311) may extend from the negative electrode (102) of the battery cell (10). The busbar body (311) may have a preset width and thickness and may extend from the negative electrode (102) of the battery cell (10) toward the circuit board (20) by a preset length. For example, one end of the busbar body (311) may be positioned at the negative electrode (102) of the battery cell (10), and the other end may be positioned at the longitudinal center region of the battery cell (10). The busbar arm (312) may extend from the other end of the busbar body (311) toward the circuit board (20). The busbar arm (312) also has a preset width and thickness and extends toward the circuit board (20), but the width of the busbar arm (312) can be formed to be smaller than the width of the busbar body (311). A chip thermistor (40) to be described later can be connected to the busbar arm (312).

[0057] The bus bar (30) may further include a second bus bar (32). The first bus bar (31) and the second bus bar (32) may be arranged in a form extending longitudinally along the outer wall of the cylindrical battery cell (10).

[0058] The second bus bar (32) may be provided to electrically connect the chip thermistor (40) and the circuit board (20), which will be described later. Specifically, the second bus bar (32) may be provided to electrically connect the positive electrode of the chip thermistor (40) and the circuit board (20). The second bus bar (32) may be provided in a form extending in the longitudinal direction of the battery cell (10) with a predetermined thickness and width between the chip thermistor (40) and the circuit board (20). One end of the second bus bar (32) may be connected to the circuit board (20), and the other end of the second bus bar (32) may be connected to the chip thermistor (40). The other end of the second bus bar (32) connected to the chip thermistor (40) may be located in the central region in the longitudinal direction of the battery cell (10). In other words, the second bus bar (31) may be formed to be shorter than the first bus bar (31). The second bus bar (32) may be provided in the form of a conductive plate and may be formed of a nickel material, for example, like the first bus bar (31).

[0059] The second bus bar (32) may be arranged to be spaced apart from the first bus bar (31). The second bus bar (32) may be arranged to be spaced apart from the first bus bar (31) by a predetermined distance in the circumferential direction of the battery cell (10). The second bus bar (32) may be connected parallel to the bus bar arm (312) of the first bus bar (31).

[0060] A chip thermistor (40) may be provided to sense the temperature of a battery cell (10). The chip thermistor (40) may be provided in the form of a chip and may be an NTC thermistor (negative temperature coefficient thermistor, NTC thermistor) whose resistance value decreases as the temperature rises. Since the chip thermistor (40) senses temperature by means of a change in the size of current due to a change in resistance, the chip thermistor (40) may be provided with a negative terminal and a positive terminal.

[0061] The chip thermistor (40) may be arranged to connect between the first bus bar (31) and the second bus bar (32). The chip thermistor (40) may be arranged between the first bus bar (31) and the second bus bar (32) so as to be in contact with both the first bus bar (31) and the second bus bar (32), thereby electrically connecting the first bus bar (31) and the second bus bar (32). More specifically, the chip thermistor (40) may connect the other end of the second bus bar (32) and the bus bar arm (312). With this arrangement, the chip thermistor (40) may be placed to be spaced apart from both longitudinal ends of the battery cell (10). More preferably, the chip thermistor (40) may be positioned at the longitudinal central portion of the battery cell (10), and thus may effectively sense the temperature of the central portion of the battery cell (10) where the most heat is generated.

[0062] The first bus bar (31) electrically connected to the negative electrode (102) of the battery cell (10) may be connected to the negative terminal of the chip thermistor (40), and the second bus bar (32) connected to the positive electrode of the circuit board (20) electrically connected to the positive electrode (101) of the battery cell (10) may be connected to the positive terminal of the chip thermistor (40). As the temperature of the battery cell (10) changes, the resistance value of the chip thermistor (40) changes, so that the amount of current flowing in the chip thermistor (40) between the first bus bar (31) and the second bus bar (32) may change, and the temperature of the battery cell (10) may be sensed through this.

[0063] The battery assembly according to Embodiment 1 of the present invention may further include a first blocking unit (91). The first blocking unit (91) may be configured to block current based on temperature data of a battery cell sensed from a chip thermistor (40). The first blocking unit (91) may be, for example, a TCO (Thermal cut-off) device configured to open and block current when the temperature of the battery cell (10) exceeds a preset temperature.

[0064] The first blocking unit (91) can be arranged to connect between the first bus bar (31) through which a large amount of current flows and the circuit board (20). Specifically, the first blocking unit (91) can connect the other longitudinal end of the first bus bar (31) and the circuit board (20). The first blocking unit (91) can be arranged between the bus bar arm (312) of the first bus bar (31) and the circuit board (20) to electrically connect the first bus bar (31) and the circuit board (20).

[0065] When an overcurrent flows in the first bus bar (31) that electrically connects the negative electrode (102) of the battery cell (10) and the circuit board (20), the first blocking unit (91) (e.g., TCO) can be opened to temporarily block the charge / discharge circuit.

[0066] The chip thermistor (40), the first busbar (31), the second busbar (32), and the first blocking unit (91) of the battery assembly according to Embodiment 1 of the present invention can be provided as a single component that is connected to each other. In other words, the chip thermistor (40), the first busbar (31), the second busbar (32), and the first blocking unit (91) are provided as a single unit, so that the structure of the assembly can be greatly simplified, and the efficiency of the battery assembly manufacturing process can be improved.

[0067] The battery assembly according to Embodiment 1 of the present invention may further include a cover unit (35) (Fig. 4). The cover unit (35) may be provided to cover the first bus bar (31), the second bus bar (32), and the chip thermistor (40) with an insulating sheet material. By employing the configuration of the cover unit (35), the phenomenon in which the first bus bar (31) and the second bus bar (32) directly contact each other and cause an electrical short circuit can be prevented, and further, the phenomenon in which the chip thermistor (40) is exposed to the outside and damaged or disconnected from the bus bar (30) can be significantly reduced.

[0068] Referring to FIG. 5, the battery assembly according to Embodiment 1 of the present invention may further include an outer material unit (50), an insulation unit (60), a cap (70), and a taping unit (80).

[0069] The outer material unit (50) may be provided to wrap and protect the outer surface of the battery cell (10). The outer material unit (50) may be formed of a film material having elasticity, and may be provided, for example, of a heat-shrinkable film that can shrink when heat is applied.

[0070] The insulating unit (60) may be provided in the form of an insulating tape (foam tape) to prevent unnecessary electrical contact and ensure insulation, and may have a circular shape so as to overlap in the length direction the battery cell (10) having a cylindrical shape. The insulating unit (60) may be provided as a pair corresponding to the positive electrode (101) and negative electrode (102) of the battery cell (10).

[0071] The cap (70) may be a rigid body having rigidity, and may be overlapped and bonded to the circuit board (20) so as to protect the electrical connection portion of the battery cell (10) and the circuit board (20) overlapped with the battery cell (10). Similarly, the cap (70) may be provided in a circular shape corresponding to the shape of the battery cell (10) having a cylindrical shape. The taping unit (80) may be provided to fix other components attached to the battery cell (10), including the bus bar (30), to the battery cell (10).

[0072] FIG. 6 is a schematic circuit diagram showing the electrical connection structure of a battery assembly according to Embodiment 1 of the present invention.

[0073] Referring to FIG. 6, the first bus bar (31) of the battery assembly according to Embodiment 1 of the present invention can be directly electrically connected to the negative electrode (102) of the battery cell (10), and a first blocking unit (91) can be arranged between the first bus bar (31) and the negative electrode (102) of the battery cell (10).

[0074] As described above, the circuit board (20) may be equipped with a microcontrol unit (MCU) (25). The microcontrol unit (25) may include a microprocessor, memory, a programmable input / output module, etc. The second bus bar (32) may electrically connect the chip thermistor (40) and the microcontrol unit (25) of the circuit board (20).

[0075] The chip thermistor (40), the first busbar, the second busbar (32), and the first blocking unit (91) can form a busbar-thermistor group (110). The busbar-thermistor group (110) is physically / electrically connected to each other and is provided as an integrated component as described above, which can simplify the structure of the battery assembly and improve process efficiency.

[0076] Example 2

[0077] Figures 7 and 8 illustrate a battery assembly according to Embodiment 2 of the present invention. Specifically, Figure 7 is a front view schematically illustrating the structure of a battery assembly according to Embodiment 2 of the present invention, and Figure 8 is a flowchart illustrating a current blocking mechanism of a battery assembly according to Embodiment 2 of the present invention.

[0078] Embodiment 2 of the present invention may differ from Embodiment 1 in that it further includes a second blocking unit (92). Except for the differences, it should be noted that the contents of the battery assembly according to Embodiment 1 of the present invention described above can be commonly applied to Embodiment 2 as well. Therefore, contents common to Embodiment 1 will be omitted as much as possible, and Embodiment 2 will be described focusing on the differences from Embodiment 1.

[0079] Referring to FIG. 7, the battery assembly according to the second embodiment of the present invention may further include a second blocking unit (92). The second blocking unit (92) may be configured to block the flow of current based on the temperature of the battery cell (10) together with the first blocking unit (91). The first blocking unit (91) and the second blocking unit (92) may form a blocking unit configured to block the current flowing in the battery assembly based on the temperature of the battery cell (10).

[0080] The second blocking unit (92) may be coupled to the circuit board (20). The second blocking unit (92) may be a fuse that is configured to be cut by receiving a signal from the circuit board (20). Unlike the first blocking unit (91) (TCO) described above, which temporarily opens and temporarily blocks the current, the second blocking unit (92) may irreversibly block the charge / discharge circuit of the battery assembly. The second blocking unit (92) may be configured to perform a blocking operation based on the temperature change rate of the battery cell (10) over time.

[0081] Referring to FIG. 8, the battery assembly according to Embodiment 2 of the present invention can interrupt current in two ways (2-track) depending on the temperature of the battery cell. It should be noted in advance that the temperature values ​​are merely exemplary values ​​for convenience of explanation and are not limiting.

[0082] When an abnormal temperature is detected, if the temperature of the battery cell (10) exceeds a preset temperature (e.g., 77 degrees Celsius), the first cut-off unit (TCO) electrically connecting the circuit board (20) and the first bus bar (31) may be opened. In this case, the electrical connection between the first bus bar (31) and the circuit board (20) may be disconnected, and the charge / discharge circuit of the battery cell may be blocked, but this may be a temporary state that can be restored when the temperature returns to normal. That is, if a temperature exceeding the preset temperature occurs, the charge / discharge circuit of the battery cell may be temporarily blocked by the operation of the first cut-off unit (91).

[0083] When the temperature change rate of the battery cell over time exceeds a preset temperature change rate (e.g., 5 degrees Celsius per second), the microcontrol unit (25) of the circuit board (20) can transmit a blocking signal to the second blocking unit (92) (fuse). When the second blocking unit (92) that received the signal is cut off, the charge / discharge circuit of the battery cell can be blocked, and since the second blocking unit (92) is not restored to normal when the temperature returns to normal, the charge / discharge circuit of the battery assembly can be restarted after the second blocking unit (92) is replaced.

[0084] In the above description, although the present invention has been described by limited embodiments and drawings, the above description is merely an example of the technical idea of ​​the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention.

[0085] Accordingly, the embodiments disclosed in the present invention are intended to illustrate, rather than limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical concepts within the scope equivalent thereto should be construed as being included within the scope of the present invention.

[0086] [Explanation of symbols]

[0087] 10: Battery cell

[0088] 101: Bipolar

[0089] 102: Cathode

[0090] 20: Circuit board

[0091] 30: Bus bar

[0092] 302: Cathode plate

[0093] 31: Busbar 1

[0094] 311: Busbar body

[0095] 312: Busbar Arm

[0096] 32: Second bus bar

[0097] 40: Chip thermistor

[0098] 50: Exterior Unit

[0099] 60: Insulation unit

[0100] 70: Cap

[0101] 80: Taping Unit

[0102] 91: First blocking unit

[0103] 92: Second blocking unit

Claims

1. Battery cell; A circuit board coupled to the battery cell so as to be electrically connected to the battery cell; A chip thermistor configured to sense the temperature of the battery cell and electrically connected to the circuit board; and A battery assembly, comprising: a first bus bar extending between the negative electrode of the battery cell and the circuit board to electrically connect the negative electrode of the battery cell and the circuit board, and electrically connected to the chip thermistor; 2. In paragraph 1, A battery assembly further comprising a second bus bar extending between the chip thermistor and the circuit board to electrically connect the chip thermistor and the circuit board, and positioned spaced apart from the first bus bar.

3. In paragraph 2, A battery assembly, wherein the chip thermistor is disposed between the first bus bar and the second bus bar to electrically connect the first bus bar and the second bus bar.

4. In paragraph 2, A battery assembly, wherein the first bus bar and the second bus bar have different widths.

5. In paragraph 4, A battery assembly, wherein the first bus bar has a thicker width than the second bus bar.

6. In paragraph 2, A battery assembly, wherein the first busbar includes a busbar body extending from a cathode of the battery cell, and a busbar arm extending from an end of the busbar body toward the circuit board and having a width smaller than that of the busbar body.

7. In paragraph 6, The above chip thermistor is a battery assembly connecting the above busbar arm and the second busbar.

8. In paragraph 1, A battery assembly, wherein the battery cell has a cylindrical shape having a longitudinal direction, and the circuit board is joined to one longitudinal end of the battery cell.

9. In paragraph 8, A battery assembly, wherein the chip thermistor is placed spaced apart from both longitudinal ends of the battery cell.

10. In paragraph 8, A battery assembly, wherein the chip thermistor is located at the longitudinal central portion of the battery cell.

11. In paragraph 6, A battery assembly further comprising a blocking unit configured to block current based on temperature data of the battery cell sensed from the chip thermistor.

12. In paragraph 11, The above blocking part; A battery assembly further comprising a first blocking unit coupled to the bus bar arm to open and block current when the temperature of the battery cell exceeds a preset reference temperature.

13. In paragraph 12, The above first blocking unit is a battery assembly connecting the bus bar arm and the circuit board.

14. In paragraph 12, The above blocking part is, A battery assembly further comprising a second blocking unit coupled to the circuit board so as to be electrically connected to the circuit board, and configured to receive a signal from the circuit board and block current when the temperature change rate of the battery cell exceeds a preset reference temperature change rate.

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