Connecting bar, connecting bar assembly and battery module

Abstract

The utility model discloses a connection bar, a connection bar assembly and a battery module, the connection bar comprises at least two battery cell connection main bodies, the at least two battery cell connection main bodies are arranged at intervals, and the battery cell connection main bodies are configured to be pole columns connected with battery cells; the terminal connecting main bodies are arranged between two adjacent battery core connecting main bodies and are connected with two corresponding battery core connecting main bodies; wherein the battery cell connecting main body is provided with an accommodating groove, and the accommodating groove is configured to accommodate and install a temperature sensing device. Through the above mode, the stability of the temperature sensing device can be improved, so that the temperature detection function is more stable.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a connecting bar, a connecting bar assembly and a battery module. Background Art

[0002] During the use of the battery, it is particularly important to detect the battery temperature.

[0003] In the related art, single cells are connected via connecting bars. One method is to stick the temperature sensor onto the connecting bar. This sticking method causes the risk of the temperature sensor falling off. Utility Model Content

[0004] In order to solve the above problems, the present application provides a connecting bar, a connecting bar assembly and a battery module, which can improve the stability of the temperature sensor device, thereby making the temperature detection function more stable.

[0005] A technical solution adopted in the present application is: to provide 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.

[0006] In one embodiment, the battery cell connection body includes a first side surface and a second side surface that are adjacent to each other, and the receiving groove includes a first opening corresponding to the first side surface, and a second opening corresponding to the second side surface.

[0007] In one embodiment, 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.

[0008] In one embodiment, a pole accommodating hole is provided on the battery cell connection body.

[0009] In one embodiment, a welding groove is provided on a side of the battery cell connection body away from the battery cell, and the pole receiving hole is provided in the welding groove.

[0010] In one embodiment, the opening directions of the receiving groove and the welding groove are the same.

[0011] In one embodiment, a first central axis is defined on one side of the connection row away from the battery cell, and 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.

[0012] In one embodiment, a terminal installation hole is provided on the terminal connection body.

[0013] In one embodiment, 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, and the terminal mounting hole is arranged in the third connection part.

[0014] In one embodiment, a second central axis is defined on one side of the terminal connection body away from the battery cell, 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.

[0015] In one embodiment, 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.

[0016] Another technical solution adopted in the present application is: to provide a connection bar assembly, which includes a collection terminal, a fastening mechanism, a temperature sensor device and the above-mentioned connection bar, the fastening mechanism is configured to fix the collection terminal and the terminal connection body of the connection bar, and the temperature sensor device is accommodated in a receiving groove installed on the battery cell connection body of the connection bar.

[0017] Another technical solution adopted in the present application is to provide a battery module, which includes at least two battery cells and a connection bar assembly as described above, wherein the poles of the battery cells are accommodated in the pole accommodating holes of the battery cell connection body.

[0018] 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 the temperature sensor device. In the above manner, the temperature sensor device is accommodated by arranging the receiving groove on the connection row, and the contact surface between the temperature sensor device and the connection row is increased, so that the temperature sensor can be more firmly fixed on the connection row, reducing the possibility of falling off, and further making the temperature detection function of the temperature sensor device more stable, making the entire battery cell work safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of a connecting bar assembly provided by the present application;

[0021] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle connecting row;

[0022] Figure 3 yes Figure 2 A schematic cross-sectional view of the middle connection row with FF upward;

[0023] Figure 4 yes Figure 3 The corresponding fastener assembly diagram;

[0024] Figure 5 yes Figure 3 A top view of the middle connecting row in the E direction;

[0025] Figure 6 yes Figure 2 A partial enlarged schematic diagram of

[0026] Figure 7 yes Figure 3 A schematic structural diagram of an embodiment of the middle terminal connection body 113.

[0027] Reference numerals:

[0028] 10, connecting bar assembly; 11, connecting bar; 12, collecting terminal; 13, fastening mechanism;

[0029] 111, first battery cell connection body; 112, second battery 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;

[0030] 113a, first connection portion; 113b, second connection portion; 113c, third connection portion 113c;

[0031] M1, first side surface; M2, second side surface; K1, first opening; K2, second opening; M, inner side surface; D, bottom surface;

[0032] I, first central axis; II, second central axis. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0036] The use of "suitable for" or "configured to" in this application is meant to be open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. In addition, the use of "based on" is meant to be open and inclusive, because the process, step, calculation or other action "based on" one or more stated conditions or values ​​can be based on additional conditions or values ​​beyond the stated values ​​in practice.

[0037] In this application, the word "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described in this application as "exemplary" is not necessarily to be construed as being preferred or advantageous over other embodiments. The following description is given to enable any technician in the field to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0038] See also Figure 1 , Figure 1 1 is a schematic diagram of the three-dimensional structure of an embodiment of a connection bar assembly provided in the present application. In this embodiment, the connection bar assembly 10 includes a connection bar 11, a collection terminal 12 and a fastening mechanism 13.

[0039] Please also read Figure 2 , Figure 3 as well as Figure 4 , Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle connecting row, Figure 3 yes Figure 2 Schematic diagram of the cross section of the middle connection row with FF upward, Figure 4 yes Figure 3 The corresponding fastener assembly diagram, Figure 5 yes Figure 3 The top view of the connection row in the E direction shows that the connection 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 by taking 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.

[0040] 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.

[0041] Optionally, in one embodiment, a welding groove 11a is provided on the side of the first cell connection body 111 and the second cell connection body 112 away from the cell, and the pole receiving hole A is provided in the welding groove 11a. It can be understood that the pole of the cell passes through the pole receiving hole A, and then the pole is welded in the welding groove 11a.

[0042] Furthermore, the terminal connection body 113 is disposed between the first battery cell connection body 111 and the second battery cell connection body 112, and the terminal connection body 113 is respectively connected to the first battery cell connection body 111 and the second battery cell connection body 112. 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, and the fastening mechanism 13 is sequentially penetrated through the positioning hole and the terminal mounting hole B to connect the collection terminal 12 and the terminal connection body 113, so as to achieve the fixation of the collection terminal 12 and the terminal connection body 113. Through this arrangement, compared with the prior art, the assembly method of the collection terminal 12 and the connection row 11 is relatively simple.

[0043] It can be understood that the collection terminal 12 is electrically connected to the poles of multiple battery cells through the connecting row 11, and can be used to collect current and voltage signals.

[0044] 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.

[0045] 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 bending connection mode 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 is as follows: Figure 2 , Figure 3 , Figure 4 The arched structure shown can form a space in which the second fastener 132 is connected to the first fastener 131, thereby avoiding interference between the second fastener 132 and the battery cell, thereby causing the risk of damaging the battery cell.

[0046] It can be understood that in practical 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.

[0047] Furthermore, a receiving groove 11 b is provided on the first battery cell connection body 111 and the second battery cell connection body 112 , and the receiving groove 11 b is configured to receive and install a temperature sensor device.

[0048] Among them, the temperature sensor device can be a thermistor, which is a sensor resistor whose resistance value changes with the change of temperature. According to the temperature coefficient, it is divided into a positive temperature coefficient thermistor (PTC thermistor, i.e., Positive Temperature Coefficient thermistor) and a negative temperature coefficient thermistor (NTC thermistor, i.e., Negative Temperature Coefficient thermistor). The resistance value of a positive temperature coefficient thermistor increases with the increase of temperature, and the resistance value of a negative temperature coefficient thermistor decreases with the increase of temperature. They are both semiconductor devices.

[0049] Further reading Figure 6 , Figure 6 yes Figure 2The partially enlarged schematic diagram shows that the battery cell connection body includes adjacent first side M1 and second side M2, the accommodating groove 11b includes a first opening K1 corresponding to the first side M1, and a second opening K2 corresponding to the second side M2, and the first opening K1 faces the side away from the battery cell.

[0050] 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.

[0051] Optionally, the thermistor generally has arc-shaped ends, so 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. In this way, the thermistor is easy to adapt to the receiving groove 11b.

[0052] It can be understood that in the related art, one way is to plug the terminal of the collection harness into the battery cell connection row, and then collect the voltage, current, temperature and other data of the battery cell through the collection harness. This plug-in structure makes the assembly method of the terminal of the collection harness and the battery cell connection row more complicated; another way is to directly paste the temperature sensor on the connection row. This pasting method makes the temperature sensor have the risk of falling off. In this embodiment, when the thermistor is accommodated and installed in the receiving groove 11b, the thermistor can be pasted into the receiving groove 11b by 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 pasting the thermistor on a plane, adding more pasting surfaces means that the thermistor can be more firmly fixed on the connection row 11, reducing the possibility of falling off, so that the thermistor can collect the temperature of the battery cell through the connection row 11.

[0053] The connection row 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, a receiving groove is provided on the battery cell connection body, and the receiving groove is configured to accommodate and install the 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 more firmly fixed on the connection row, reducing the possibility of falling off, and further making the temperature detection function of the temperature sensor more stable, making the entire battery cell work safer.

[0054] See also Figure 5In one embodiment, a first central axis I is defined on one side of the connection row 11 away from the battery cell, 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 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 only a virtual line defined for the convenience of explanation.

[0055] Continue reading Figure 5 In another embodiment, a second central axis II is defined on one side of the connecting row 11 away from the battery cell, and the number of the 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 the same. In this case, it is easy for the connection row 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 row 11 is installed upside down, the position of the terminal mounting hole B changes. At this time, if the terminal mounting hole B is used to install the collection terminal 12, it is necessary to rearrange the connection line of the collection terminal 12. In addition, the collection terminal 12 may interfere with other structures in the battery module. In the present embodiment, two terminal mounting holes B are provided in the above manner. Even if the connection row 11 is installed upside down, the installation position of the collection terminal 12 will not be affected, thereby playing a fool-proof role.

[0056] In one embodiment, see Figure 7 , Figure 7 yes Figure 3 A schematic structural diagram of an embodiment of a middle terminal connection body 113, 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 third connection portion 113c is provided with the above-mentioned terminal mounting hole B.

[0057] 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, which, on the one hand, ensures that the fastening mechanism 13 (such as the second fastening mechanism 132) has sufficient installation space to install the collection terminal 12, and on the other hand, prevents the situation in which the structural strength of the connection row 11 becomes low due to the distance being too large.

[0058] 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.

[0059] 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.

[0060] The display screen provided in the embodiment of the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A connecting bar, characterized in that: The connecting row comprises: At least two battery cell connection bodies, at least two of which are spaced apart from each other, and are configured to connect 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 cell connection body, and the receiving groove is configured to receive and install a temperature sensor device.

2. The connecting bar according to claim 1, characterized in that: The battery cell connection body includes a first side surface and a second side surface that are adjacent to each other, and the receiving 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, characterized in that: 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, characterized in that: The battery cell connection body is provided with a pole accommodating hole.

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

6. The connecting bar according to claim 5, characterized in that: The opening directions of the receiving groove and the welding groove are the same.

7. The connecting bar according to claim 4, characterized in that: A first central axis is defined on one side of the connection row away from the battery cell, and 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, characterized in that: The terminal connection body is provided with a terminal installation hole.

9. The connecting bar according to claim 8, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The connecting bar assembly comprises a collecting terminal, a fastening mechanism, a temperature sensor device and a connecting bar according to any one of claims 1 to 11, wherein the fastening mechanism is configured to fix the collecting terminal and the terminal connecting body of the connecting bar, and the temperature sensor device is accommodated in a receiving groove installed on the battery cell connecting body of the connecting bar.

13. A battery module, characterized in that: The battery module comprises at least two battery cells and a 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.

Images