Busbar, busbar assembly and battery module

Abstract

A busbar (11), a busbar assembly (10) and a battery module. The busbar (11) comprises: at least two battery cell connecting main bodies, wherein the at least two battery cell connecting main bodies are spaced apart, and the battery cell connecting main bodies are configured to be connected to poles of battery cells; and a terminal connecting main body (113) arranged between two adjacent battery cell connecting main bodies and connected to the two corresponding battery cell connecting main bodies, wherein an accommodating groove (11b) is formed in one battery cell connecting main body, and the accommodating groove (11b) is configured to accommodate and mount a temperature sensor.

Description

Connecting bar, connecting bar assembly and battery module

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 5, 2024, with application number 2024202817251. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of battery technology, and in particular to a connecting bar, a connecting bar assembly, and a battery module. Background Art

[0003] During the use of the battery, it is particularly important to detect the battery temperature.

[0004] In the related art, single cells are connected via connecting bars. One method is to stick the temperature sensor on the connecting bar. This sticking method poses a risk of the temperature sensor falling off. Technical issues

[0005] The present application provides a connecting bar, a connecting bar assembly, and a battery module, which can improve the stability of a temperature sensor device, thereby making the temperature detection function more stable. Technical Solutions

[0006] In a first aspect, an embodiment of the present application provides a connection row, which includes: at least two battery cell connection bodies, at least two battery cell connection bodies are arranged at intervals, and the battery cell connection bodies are configured to connect the poles of the battery cells; a terminal connection body, which is arranged between two adjacent battery cell connection bodies and connects the corresponding two battery cell connection bodies; wherein a receiving groove is provided on the battery cell connection body, and the receiving groove is configured to accommodate and install a temperature sensor device.

[0007] In a second aspect, an embodiment of the present application provides a connecting bar assembly, which includes a collection terminal, a fastening mechanism, a temperature sensor device and the above-mentioned connecting bar, wherein the fastening mechanism is configured to fix the collection terminal and the terminal connection body of the connecting bar, and the temperature sensor device is accommodated in a receiving groove installed on the battery cell connection body of the connecting bar.

[0008] In a third aspect, an embodiment of the present application provides a battery module, which includes at least two battery cells and a connecting bar assembly as described above, wherein the poles of the battery cells are accommodated in the pole accommodating holes of the battery cell connecting body. Beneficial effects

[0009] The connection row provided by the present application includes: at least two battery cell connection bodies, at least two battery cell connection bodies are arranged at intervals, and the battery cell connection bodies are configured to connect the poles of the battery cells; a terminal connection body is arranged between two adjacent battery cell connection bodies and connects the corresponding two battery cell connection bodies; wherein, a receiving groove is provided on the battery cell connection body, and the receiving groove is configured to accommodate and install a temperature sensor. In the above manner, by arranging the receiving groove on the connection row to accommodate the temperature sensor, the contact surface between the temperature sensor and the connection row is increased, so that the temperature sensor can be fixed on the connection row more firmly, reducing the possibility of falling off, further making the temperature detection function of the temperature sensor more stable, and making the operation of the entire battery cell safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic diagram of the three-dimensional structure of an embodiment of a connecting bar assembly provided by the present application;

[0011] FIG2 is a schematic diagram of the three-dimensional structure of the connecting row in FIG1 ;

[0012] FIG3 is a schematic cross-sectional view of the connection row in FIG2 with FF upward;

[0013] FIG4 is a schematic diagram of the fastener assembly corresponding to FIG3;

[0014] FIG5 is a schematic top view of the connection row in FIG3 in the direction E;

[0015] FIG6 is a partial enlarged schematic diagram of FIG2;

[0016] FIG. 7 is a schematic structural diagram of an embodiment of the terminal connection body 113 in FIG. 3 .

[0017] Reference numerals:

[0018] 10, connecting bar assembly; 11, connecting bar; 12, collecting terminal; 13, fastening mechanism;

[0019] 111, first cell connection body; 112, second cell connection body; 113, terminal connection body; A, pole receiving hole; B, terminal mounting hole; 11a, welding groove; 11b, receiving groove; 131, first fastener; 132, second fastener;

[0020] 113a, first connection portion; 113b, second connection portion; 113c, third connection portion 113c;

[0021] M1, first side surface; M2, second side surface; K1, first opening; K2, second opening; M, inner side surface; D, bottom surface;

[0022] I, first central axis; II, second central axis. Modes for Carrying Out the Invention

[0023] Please refer to FIG. 1 , which is a schematic diagram of the three-dimensional structure of an embodiment of a connection bar assembly provided in the present application. The connection bar assembly 10 in this embodiment includes a connection bar 11 , a collection terminal 12 and a fastening mechanism 13 .

[0024] Please refer to Figures 2, 3, and 4. Figure 2 is a schematic diagram of the three-dimensional structure of the connecting row in Figure 1, Figure 3 is a schematic cross-sectional diagram of the connecting row in Figure 2 with the FF direction upward, Figure 4 is a schematic diagram of the fastener assembly corresponding to Figure 3, and Figure 5 is a top view of the connecting row in Figure 3 in the E direction. The connecting row 11 includes at least two battery cell connection bodies and one terminal connection body 113. It is worth noting that the battery cell connection bodies in the following embodiments are described using the adjacent first battery cell connection body 111 and the second battery cell connection body 112 as an example. In other embodiments, there may be three or more battery cell connection bodies, and accordingly, there may be more terminal connection bodies 113.

[0025] Among them, the first battery cell connection body 111 and the second battery cell connection body 112 are arranged at intervals, and the first battery cell connection body 111 and the second battery cell connection body 112 are respectively provided with a pole accommodating hole A, and the pole accommodating hole A of the first battery cell connection body 111 and the pole accommodating hole A of the second battery cell connection body 112 can respectively accommodate poles of different battery cells.

[0026] Optionally, in one embodiment, a welding groove 11a is provided on the side of the first and second cell connection bodies 111 and 112 away from the cell, and the electrode receiving hole A is provided in the welding groove 11a. It is understood that the cell electrode passes through the electrode receiving hole A and is then welded in the welding groove 11a.

[0027] Furthermore, the terminal connection body 113 is disposed between the first cell connection body 111 and the second cell connection body 112, and is connected to the first cell connection body 111 and the second cell connection body 112, respectively. In an optional embodiment, the terminal connection body 113 is provided with a terminal mounting hole B, and the collection terminal 12 is provided with a corresponding positioning hole. The fastening mechanism 13 is sequentially inserted through the positioning hole and the terminal mounting hole B to connect the collection terminal 12 and the terminal connection body 113, thereby securing the collection terminal 12 and the terminal connection body 113. This arrangement simplifies the assembly of the collection terminal 12 and the connection bar 11 compared to related technologies.

[0028] It can be understood that the collection terminal 12 is electrically connected to the poles of multiple battery cells through the connecting bar 11 and can be used to collect current and voltage signals.

[0029] Among them, in this embodiment, the fastening mechanism 13 includes a first fastener 131 and a second fastener 132. The first fastener 131 is sequentially inserted into the collection terminal 12 and the terminal mounting hole B, and the second fastener 132 is connected to the first fastener 131, so that the collection terminal 12 is pressed onto the terminal connection body 113 through the first fastener 131, so that the collection terminal 12 and the terminal connection body 113 can be fully in contact.

[0030] Optionally, the terminal connection body 113 is bent and connected to the first battery cell connection body 111 and the second battery cell connection body 112 respectively. Due to the above-mentioned bending connection method of the terminal connection body 113 and the first battery cell connection body 111 and the second battery cell connection body 112, the terminal connection body 113 has an arch structure as shown in Figures 2, 3, and 4. The arch structure can form a space, and the second fastener 132 is connected to the first fastener 131 in the space to avoid interference between the second fastener 132 and the battery cell, thereby causing the risk of damage to the battery cell.

[0031] It is understandable that in actual applications, the first fastener 131 can be a bolt, and the second fastener 132 can be a nut, and the two are connected together by threaded connection.

[0032] Furthermore, an accommodating groove 11 b is provided on the first battery cell connection body 111 and the second battery cell connection body 112 , and the accommodating groove 11 b is configured to accommodate and install a temperature sensor device.

[0033] The temperature sensor device can be a thermistor, a sensor resistor whose resistance changes with temperature. Based on their temperature coefficients, they are classified as positive temperature coefficient thermistors (PTC thermistors) and negative temperature coefficient thermistors (NTC thermistors). The resistance of a positive temperature coefficient thermistor increases with increasing temperature, while the resistance of a negative temperature coefficient thermistor decreases with increasing temperature. Both are semiconductor devices.

[0034] Further referring to FIG6 , FIG6 is a partial enlarged schematic diagram of FIG2 , the battery cell connection body includes adjacent first side surface M1 and second side surface M2, the accommodating groove 11b includes a first opening K1 corresponding to the first side surface M1, and a second opening K2 corresponding to the second side surface M2, and the first opening K1 faces the side away from the battery cell.

[0035] It can be understood that when the pole of the battery cell is placed upward, the first opening K1 faces upward and the second opening K2 faces the side. In this way, the temperature sensor device can be placed from above or from the side.

[0036] Alternatively, thermistors generally have arc-shaped ends. Therefore, in one embodiment, the receiving groove 11b includes a bottom surface D corresponding to the first opening K1 and an inner side surface M corresponding to the second opening K2, and the inner side surface M is an arc surface. This facilitates the fit of the thermistor into the receiving groove 11b.

[0037] It is understandable that in the related art, one method is to plug the terminals of the collection harness into the cell connection bar, and then collect the voltage, current, temperature and other data of the cell through the collection harness. This plug-in structure makes the assembly method of the terminals of the collection harness and the cell connection bar more complicated; another method is to directly stick the temperature sensor on the connection bar. This sticking method makes the temperature sensor at risk of falling off. In this embodiment, when the thermistor is accommodated and installed in the receiving groove 11b, the thermistor can be stuck into the receiving groove 11b using a dispensing process. In this way, the contact surface between the thermistor and the inner wall of the receiving groove 11b is the bottom surface D, the inner side surface M, and the left and right inner side surfaces adjacent to the inner side surface M, that is, a total of four surfaces. Compared with sticking the thermistor on a flat surface, adding more sticking surfaces means that the thermistor can be more firmly fixed to the connection bar 11, reducing the possibility of falling off, so that the thermistor can collect the temperature of the cell through the connection bar 11.

[0038] The connection bar provided in this embodiment includes: at least two battery cell connection bodies, at least two battery cell connection bodies are arranged at intervals, and the battery cell connection bodies are configured to connect the poles of the battery cells; a terminal connection body is arranged between two adjacent battery cell connection bodies and connects the corresponding two battery cell connection bodies; wherein the battery cell connection bodies are provided with a receiving groove, and the receiving groove is configured to accommodate and install a temperature sensor. In this way, by providing a receiving groove on the connection bar to accommodate the temperature sensor, the contact surface between the temperature sensor and the connection bar is increased, so that the temperature sensor can be more firmly fixed to the connection bar, reducing the possibility of falling off, further making the temperature detection function of the temperature sensor more stable, and making the operation of the entire battery cell safer.

[0039] Referring to Figure 5, in one embodiment, a first central axis I is defined on the side of the connecting row 11 away from the battery cell, and the pole accommodating hole A of the first battery cell connecting body 111 and the pole accommodating hole A of the second battery cell connecting body 112 are respectively arranged on both sides of the first central axis I and are symmetrical based on the first central axis I. It can be understood that the first central axis I is merely a virtual line defined for the convenience of explanation.

[0040] Continuing to refer to Figure 5, in another embodiment, a second central axis II is defined on the side of the connecting row 11 away from the battery cell, and the number of terminal mounting holes B is two (for example, a first sub-mounting hole and a second sub-mounting hole). The two terminal mounting holes B are respectively arranged on both sides of the second central axis II and are symmetrical based on the second central axis II. It can be understood that the second central axis II is merely a virtual line defined for the convenience of explanation. In actual applications, since the structures of different battery cells are the same, the structures of the first battery cell connection body 111 and the second battery cell connection body 112 are usually also the same, so it is easy for the connection bar 11 to be installed upside down. Although this situation has no effect on the first battery cell connection body 111 and the second battery cell connection body 112, it does affect the installation position of the collection terminal 12. For example, there is only one terminal mounting hole B. If the connection bar 11 is installed upside down, the position of the terminal mounting hole B will change. At this time, if the terminal mounting hole B is used to install the collection terminal 12, the connection line of the collection terminal 12 needs to be rearranged, and the collection terminal 12 may interfere with other structures in the battery module. In this embodiment, two terminal mounting holes B are provided in the above manner. Even if the connection bar 11 is installed upside down, it will not affect the installation position of the collection terminal 12, thereby playing a fool-proof role.

[0041] In one embodiment, referring to Figure 7, Figure 7 is a structural schematic diagram of an embodiment of the terminal connection body 113 in Figure 3, the terminal connection body 113 includes a first connection portion 113a, a second connection portion 113b and a third connection portion 113c, the first connection portion 113a is bent and connected to the first battery cell connection body 111, the second connection portion 113b is bent and connected to the second battery cell connection body 112, the third connection portion 113c is arranged between the first connection portion 113a and the second connection portion 113b and is bent and connected to the first connection portion 113a and the second connection portion 113b respectively, and the above-mentioned terminal mounting hole B is provided on the third connection portion 113c.

[0042] Optionally, a distance H between the lower surface of the cell connection body (the first cell connection body 111 or the second cell connection body 112) and the lower surface of the third connection portion 113c is greater than or equal to 3 mm and less than or equal to 4 mm. This ensures that the fastening mechanism 13 (such as the second fastening mechanism 132) has sufficient installation space to install the collection terminal 12, and prevents the structural strength of the connection bar 11 from being reduced due to the distance being too large.

[0043] In other embodiments, the terminal connection body 113 may also be arranged in an arc shape as a whole. In addition, the first battery cell connection body 111 , the terminal connection body 113 and the second battery cell connection body 112 may be integrally formed.

[0044] An embodiment of the present application also provides a battery module, which includes multiple battery cells and a connection row assembly 10 in the above embodiment. Taking the first battery cell and the second battery cell as an example, the pole of the first battery cell is accommodated in the pole accommodating hole A of the first battery cell connecting body 111, and the pole of the second battery cell is accommodated in the pole accommodating hole A of the second battery cell connecting body 112.

Claims

1. A connecting bar, comprising: At least two battery cell connection bodies, the at least two battery cell connection bodies are spaced apart, and the battery cell connection bodies are configured to connect to poles of battery cells; A terminal connection body, disposed between two adjacent battery cell connection bodies and connecting the corresponding two battery cell connection bodies; Wherein, a receiving groove is provided on the battery core connection body, and the receiving groove is configured to receive and install a temperature sensor device.

2. The connecting bar according to claim 1, wherein: The battery cell connection body includes a first side surface and a second side surface that are adjacent to each other. The accommodating groove includes a first opening corresponding to the first side surface and a second opening corresponding to the second side surface.

3. The connecting bar according to claim 2, wherein: The receiving groove includes a bottom surface corresponding to the first opening and an inner side surface corresponding to the second opening, and the inner side surface is a curved surface.

4. The connecting bar according to any one of claims 1 to 3, wherein: The battery cell connection body is provided with a pole accommodating hole.

5. The connecting bar according to claim 4, wherein: A welding groove is provided on a side of the battery cell connection body away from the battery cell, and the pole accommodating hole is provided in the welding groove.

6. The connecting bar according to claim 5, wherein: The opening directions of the accommodating groove and the welding groove are the same.

7. The connecting bar according to claim 4, wherein: A first central axis is defined on one side of the connection row away from the battery cell, and the two pole receiving holes corresponding to two adjacent battery cell connection bodies are respectively arranged on both sides of the first central axis and are symmetrical relative to the first central axis.

8. The connecting bar according to any one of claims 1 to 3, wherein: The terminal connection body is provided with a terminal mounting hole.

9. The connecting bar according to claim 8, wherein: The terminal connection body includes a first connection part, a second connection part and a third connection part. The first connection part and the second connection part are respectively bent and connected to the two battery cell connection bodies. The third connection part is arranged between the first connection part and the second connection part and is respectively bent and connected to the first connection part and the second connection part. The terminal mounting hole is arranged in the third connection part.

10. The connecting bar according to claim 9, wherein: A second central axis is defined on one side of the terminal connection body away from the battery core, and the terminal mounting hole includes a first sub-mounting hole and a second sub-mounting hole. The first sub-mounting hole and the second sub-mounting hole are respectively arranged on both sides of the second central axis and are symmetrical relative to the second central axis.

11. The connecting bar according to claim 9, wherein: A distance between a lower surface of the battery cell connection body and a lower surface of the third connection portion is greater than or equal to 3 mm and less than or equal to 4 mm.

12. A connecting bar assembly, comprising a collection terminal, a fastening mechanism, a temperature sensor, and the connecting bar according to any one of claims 1 to 11, wherein the fastening mechanism is configured to fix the collection terminal and the terminal connection body of the connecting bar, and the temperature sensor is accommodated in a receiving groove installed on the battery cell connection body of the connecting bar.

13. A battery module comprising at least two battery cells and the connecting bar assembly as claimed in claim 12, wherein the poles of the battery cells are accommodated in the pole accommodating holes of the battery cell connecting body.

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