Battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack, which comprises a plurality of cylindrical batteries, a plurality of batteries and a plurality of batteries, the busbar is used for connecting the poles of the plurality of cylindrical batteries; a temperature sensor is arranged at one end, close to the cylindrical battery, of the wire harness plate; the temperature sensor is fixedly connected with the pole and is positioned in an area where the pole is not in contact with the busbar; the area occupied by the temperature sensor on the pole is a first area, the area, not in contact with the busbar, of the pole is a second area, and the ratio of the first area to the second area is A. The temperature sensor is arranged on the pole, and the pole is more easily influenced by the temperature of the roll core of the cylindrical battery, so that the temperature sensor can more directly and quickly sense the temperature change in the battery. And meanwhile, the temperature sensor is positioned in a non-contact area of the pole and the busbar, so that accurate monitoring can be carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] At present, technicians usually install temperature sensors on the surface of the battery or inside the battery near the heat source, so that the actual operating temperature of the battery pack can be measured in time through the temperature sensor. However, the battery pack is usually equipped with a liquid cooling device for cooling the battery, which makes the battery shell easily affected by the cooling of the liquid cooling device, resulting in a large deviation between the battery temperature detected by the temperature sensor and the actual temperature inside the battery, resulting in inaccurate temperature detection. Utility Model Content

[0003] In view of this, the utility model provides a battery pack to solve the problem that the battery temperature detected by the temperature sensor is inaccurate.

[0004] In a first aspect, the utility model provides a battery pack, the battery pack comprising:

[0005] A plurality of cylindrical batteries, each having a pole disposed on one end surface along the axial direction of the cylindrical battery;

[0006] The busbar connects the poles of multiple cylindrical batteries;

[0007] A wiring harness plate is provided with a temperature sensor at one end close to the cylindrical battery; the temperature sensor is fixedly connected to the pole and is located in an area where the pole is not in contact with the busbar;

[0008] The area occupied by the temperature sensor on the pole is a first area, the area where the pole is not in contact with the busbar is a second area, the ratio between the first area and the second area is A, and A is between 20% and 80%.

[0009] Beneficial effect: The embodiment of the utility model sets the temperature sensor on the pole. Since the pole itself is small in size and the heat capacity of the material used is also relatively small, the pole itself is more easily affected by the core temperature of the cylindrical battery, so it can ensure that the temperature sensor can sense the temperature change inside the battery more directly and quickly. At the same time, the temperature sensor is located in the area where the pole does not contact the bus bar, which can avoid the influence of heat transfer from the bus bar as much as possible, ensuring that the temperature change of the cylindrical battery can be accurately monitored. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 It is a schematic diagram of a partial structure inside the battery pack in an embodiment of the present invention;

[0012] Figure 2 It is a schematic diagram of a partial structure inside the battery pack in another direction in an embodiment of the present invention;

[0013] Figure 3 For Figure 2 It is a partial enlarged view of B in

[0014] Explanation of reference numerals:

[0015] 1. Cylindrical battery; 11. Pole; 2. Busbar; 3. Wiring harness board; 31. Extension part; 32. Buffer; 4. Temperature sensor; 5. Mounting seat; 51. Mounting member; 52. Fixing member. Specific embodiments

[0016] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0018] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can also be the communication inside two components. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] Currently, technicians usually install temperature sensors on the surface of the battery or inside near the heat source, so that the actual working temperature of the battery pack can be measured in time through the temperature sensors. However, a liquid cooling device for cooling the battery is usually provided in the battery pack, which makes the outer shell of the battery vulnerable to the cooling effect of the liquid cooling device, resulting in a large deviation between the battery temperature detected by the temperature sensor and the actual temperature inside the battery, thus causing the problem of inaccurate temperature detection.

[0021] In view of this, the present utility model provides a battery pack to solve the problem of inaccurate battery temperature detected by the temperature sensor.

[0022] The following combines Figures 1 to 3 , to describe the embodiments of the present utility model.

[0023] According to an embodiment of the present utility model, on the one hand, a battery pack is provided, as Figure 1 shown, the battery pack includes: cylindrical battery 1, bus bar 2, wiring harness board 3, and temperature sensor 4.

[0024] Specifically, in the embodiment of the present utility model, a plurality of cylindrical batteries 1 can be arranged in the battery pack, and a pole column 11 is provided on one end face along the axial direction of the cylindrical battery 1. Of course, the pole column 11 can be installed on the cover plate at the top of the cylindrical battery 1. For the installation method, the pole column 11 can be directly welded or fixed on the cover plate to facilitate the input and output of electric energy. This embodiment is only an example of the setting position and installation method of the pole column 11, but it is not limited thereto. Those skilled in the art can make changes according to the actual situation as long as the same technical effects can be achieved.

[0025] Further, in the embodiment of the present utility model, the bus bar 2 connects the pole columns 11 of multiple cylindrical batteries 1, so that multiple single cylindrical batteries 1 can be connected in series and parallel to achieve the collection and distribution of electric energy, thereby meeting the requirements of higher voltage and more battery capacity of the battery pack.

[0026] Further, in the embodiment of the present utility model, as Figure 1 shown, a temperature sensor 4 is provided at one end of the wire harness board 3 close to the cylindrical battery 1, and the temperature sensor 4 is electrically connected to the wire harness board 3. That is to say, the wire harness board 3 can be used as a support board to fix the temperature sensor 4, and can also be used as a medium for current conduction to transmit the temperature detection data obtained by the temperature sensor 4 to the battery management module in a timely manner. Technicians can judge the working conditions of each battery in the battery pack according to the temperature data obtained in the battery management module.

[0027] Further, in the embodiment of the present utility model, the temperature sensor 4 is fixedly connected to the pole column 11 and is located in an area where the pole column 11 and the bus bar 2 do not contact. For the fixing method, the pole column 11 and the temperature sensor 4 can be bonded together with conductive glue, or connected by welding. Of course, an installation clip can also be constructed on the pole column 11 through a conductive member. The conductive member can be directly sleeved on the pole column 11, and the temperature sensor 4 can also be directly placed in the installation clip and in close contact with the conductive member. For the setting position, for example, when the lower side of the side surface of the pole column 11 contacts the bus bar 2, the temperature sensor 4 can be set on the upper side of the side surface of the pole column 11 or on the top surface of the pole column 11.

[0028] Of course, this embodiment is only an example for illustrating the setting position and fixing method of the temperature sensor 4, but it is not limited thereto. Those skilled in the art can make changes according to the actual situation as long as the same technical effects can be achieved.

[0029] Further, in the embodiment of the present utility model, the area occupied by the temperature sensor 4 on the pole column 11 is the first area, the area where the pole column 11 and the bus bar 2 do not contact is the second area, and the ratio between the first area and the second area is A, and A is between 20% and 80%. Of course, this embodiment is only an example for illustrating the specific range of the ratio. Those skilled in the art can select specific values within this range according to the actual situation. This embodiment is not limited thereto as long as the same technical effects can be achieved.

[0030] In this way, the embodiment of the utility model sets the temperature sensor 4 on the pole 11. Since the pole 11 itself is small in size and the heat capacity of the material used is also small, the pole 11 itself is more easily affected by the core temperature of the cylindrical battery 1, so it can ensure that the temperature sensor 4 can sense the temperature change inside the battery more directly and quickly. At the same time, the temperature sensor 4 is located in the area where the pole 11 does not contact the bus 2, which can avoid the heat transfer effect of the bus 2 as much as possible, ensuring that the temperature change of the cylindrical battery 1 can be accurately monitored.

[0031] Further, in an optional implementation, the minimum distance between the temperature sensor 4 and the busbar 2 is between 2 mm and 10 mm. Of course, this embodiment is only an example of the specific range of the minimum distance, and those skilled in the art can select a specific value within the range according to actual conditions. This embodiment is not limited to this, and the same technical effect can be achieved.

[0032] In this way, installing the temperature sensor 4 within this distance interval can avoid the temperature sensor 4 from being affected by the heat transfer of the bus 2 as much as possible, ensuring that the temperature change of the cylindrical battery 1 can be accurately monitored. At the same time, it will not affect the installation range of the temperature sensor 4, ensuring that the temperature sensor 4 can work normally.

[0033] Further, in an optional embodiment, the temperature sensor 4 is fixed to the pole 11 by means of an adhesive connection. For example, it can be fixed by double-sided tape or structural adhesive. Of course, this embodiment is only an example of a specific type of adhesive, but it is not limited thereto. Those skilled in the art can make changes according to actual conditions as long as the same technical effect can be achieved.

[0034] Furthermore, in an optional embodiment, the wiring harness plate 3 is formed with an extension portion 31 at one end close to the cylindrical battery 1, and the temperature sensor 4 is installed on the extension portion 31. In the embodiment of the present invention, the extension portion 31 can be directly formed when the wiring harness plate 3 is manufactured, or the extension portion 31 can be separately provided on the wiring harness plate 3. For a separate setting, a connection port can be provided on the wiring harness plate 3, and a connector corresponding to the connection port can be provided on the extension portion 31, and communication between the extension portion 31 and the wiring harness plate 3 can be achieved through the docking of the connection port and the connector. In this way, after the temperature sensor 4 is installed, the temperature data can still be transmitted through the extension portion 31 and the wiring harness plate 3.

[0035] Of course, this embodiment only exemplifies the forming method and fixing method of the extension part 31, but is not limited thereto. Those skilled in the art can make changes according to actual situations as long as the same technical effects can be achieved.

[0036] With such a setting, in this embodiment, by providing the extension part 31, in actual application, the temperature sensor 4 can be additionally fixed, preventing the temperature sensor 4 from directly falling off the pole 11 when the vehicle encounters vibration or impact during driving, and ensuring the continuity and reliability of temperature monitoring. At the same time, since a communication port connected to the temperature sensor 4 can be provided on the extension part 31, it is convenient to assemble the temperature sensor 4, saving the assembly time and assembly steps of technicians.

[0037] Furthermore, in an alternative embodiment, as Figure 3 shown, the wiring harness board 3 is provided with a wiring layer only on the end face close to the cylindrical battery 1. After folding the extension part 31, the temperature sensor 4 is connected to the wiring layer of the extension part 31. In order to keep the shape of the extension part 31 and ensure that the wiring layer can communicate normally, a buffer member 32 can be placed at the folding position to support the extension part 31 at the folding position. The buffer member 32 can use light-weight foam.

[0038] Furthermore, in an alternative embodiment, the top end face and the bottom end face of the wiring harness board 3 are both provided with wiring layers, or the wiring harness board 3 is provided with a wiring layer only on the end face close to the cylindrical battery 1. The length of the extension part 31 is greater than the distance between the pole 11 and the wiring harness board 3, so that a bending part is provided on the extension part 31. Thereby, the tolerance during the assembly process can be increased, facilitating installation and compensating for installation errors, thus improving production efficiency and assembly quality.

[0039] Furthermore, in an alternative embodiment, as Figure 1 shown, the battery pack further includes a mounting seat 5, and the mounting seat 5 is arranged on the bus bar 2. The mounting seat 5 is made of an insulating material, and after the mounting seat 5 is fixed to the bus bar 2, one end of the mounting seat 5 abuts against the temperature sensor 4, clamping the temperature sensor 4 between the mounting seat 5 and the bus bar 2, thereby fixing the temperature sensor 4 on the pole 11.

[0040] With such a setting, in this embodiment, by providing the mounting seat 5, the mechanical stability of the temperature sensor 4 in the battery pack is enhanced. Especially when the vehicle encounters vibration or impact during driving, it can effectively prevent the temperature sensor 4 from falling off, ensuring the continuity and reliability of temperature monitoring.

[0041] Furthermore, in an alternative embodiment, asFigure 3 As shown, the mounting base 5 includes a mounting member 51 and a fixing member 52.

[0042] Specifically, in this embodiment, the mounting member 51 is connected to the bus bar 2. For the connection method, it can be connected by bonding, or by screws and screw holes, or by snap - fit grooves. Of course, this embodiment is only an example of the fixing method of the mounting member 51, but it is not limited thereto. Those skilled in the art can make changes according to the actual situation as long as the same technical effect can be achieved.

[0043] Furthermore, in this embodiment, as Figure 3 shown, the fixing member 52 is arranged on the mounting member 51 and extends above the temperature sensor 4. After the mounting base 5 is completely fixed to the bus bar 2, the end face of the fixing member 52 close to the temperature sensor 4 abuts against the temperature sensor 4.

[0044] Furthermore, in an optional implementation manner, the fixing member 52 is provided with a fixing groove adapted to accommodate the temperature sensor 4 at the end face close to the temperature sensor 4. When the fixing member 52 abuts against the temperature sensor 4, the fixing groove and the pole 11 clamp the temperature sensor 4 and limit the temperature sensor 4, so that the sensor cannot be separated from the pole 11.

[0045] Furthermore, in an optional implementation manner, the mounting member 51 is provided with a fixing buckle, and the bus bar 2 is provided with a fixing hole. The fixing buckle is adapted to be snapped into the fixing hole.

[0046] Furthermore, in an optional implementation manner, the temperature sensor 4 is an NTC thermistor.

[0047] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, Including: A plurality of cylindrical batteries (1), with a pole column (11) provided on one end face along the axial direction of the cylindrical battery (1); A bus bar (2) for connecting the pole columns (11) of the plurality of cylindrical batteries (1); A wire harness board (3), with a temperature sensor (4) provided at one end close to the cylindrical battery (1); the temperature sensor (4) is fixedly connected to the pole column (11) and is located in an area where the pole column (11) does not contact the bus bar (2); The area occupied by the temperature sensor (4) on the pole column (11) is a first area, the area where the pole column (11) does not contact the bus bar (2) is a second area, and the ratio between the first area and the second area is A, and A is between 20% and 80%.

2. The battery pack according to claim 1, characterized in that, The minimum distance between the temperature sensor (4) and the bus bar (2) is between 2 mm and 10 mm.

3. The battery pack according to claim 2, characterized in that, The temperature sensor (4) is fixed to the pole column (11) by an adhesive connection method.

4. The battery pack according to any one of claims 1 to 3, characterized in that The wire harness board (3) is formed with an extension part (31) at one end close to the cylindrical battery (1), and the temperature sensor (4) is installed on the extension part (31).

5. The battery pack according to claim 4, wherein The wire harness board (3) is provided with a wiring layer only on the end face close to the cylindrical battery (1). After the extension part (31) is folded, the temperature sensor (4) is connected to the wiring layer of the extension part (31).

6. The battery pack according to claim 4, wherein The top end face and the bottom end face of the wire harness board (3) are both provided with wiring layers, or the wire harness board (3) is provided with a wiring layer only on the end face close to the cylindrical battery (1), and the length of the extension part (31) is greater than the distance between the pole column (11) and the wire harness board (3), so that a bending part is provided on the extension part (31).

7. The battery pack according to any one of claims 1 to 3, characterized in that, The battery pack further includes: A mounting seat (5) provided on the bus bar (2); the mounting seat (5) is made of an insulating material, and one end of the mounting seat (5) abuts against the temperature sensor (4) and fixes the temperature sensor (4) on the pole column (11).

8. The battery pack according to claim 7, wherein, The mounting seat (5) includes: A mounting member (51) connected to the bus bar (2); A fixing member (52) provided on the mounting member (51) and extending above the temperature sensor (4); the end face of the fixing member (52) close to the temperature sensor (4) abuts against the temperature sensor (4).

9. The battery pack according to claim 8, characterized in that, The fixing member (52) is provided with a fixing groove suitable for accommodating the temperature sensor (4) on the end face close to the temperature sensor (4). When the fixing member (52) abuts against the temperature sensor (4), the fixing groove and the pole column (11) clamp the temperature sensor (4).

10. The battery pack according to claim 8 or 9, characterized in that, The temperature sensor (4) is an NTC thermistor.

Images