Battery pack

Abstract

The utility model discloses a battery pack and belongs to the technical field of batteries. The battery pack comprises at least two battery cells, the at least two battery cells are arranged in sequence, and an electrode and a pressure relief piece are arranged on the first end face of each battery cell at intervals; the bars are connected with the electrodes of the two adjacent battery cells, so that the two adjacent battery cells are connected in series or in parallel; the battery pack comprises a plurality of battery cells, a plurality of temperature control parts, any two of the plurality of temperature control parts are arranged at intervals, the temperature control parts comprise first temperature control parts, and each first temperature control part is connected with the first end faces of the two adjacent battery cells. And the projection of the first temperature control piece on the first end face is located in an area where two adjacent battery cells are close to each other so as to avoid the electrode and the pressure relief piece.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack. Background Technology

[0002] As the power source for new energy vehicles, the safety of power batteries has received widespread attention in the industry. Power batteries consist of battery modules, which in turn contain multiple cells connected in series or parallel.

[0003] To reduce safety hazards caused by excessively high or low temperatures in the battery module during operation, related technologies include a temperature control board for the power battery. This board is attached to the bottom surface of the battery module to regulate its temperature, thereby preventing it from becoming too high or too low.

[0004] However, the above configuration results in low space utilization and low energy density of the power battery. Utility Model Content

[0005] This utility model discloses a battery pack to solve, or at least partially solve, the problems of low space utilization and low energy density of power batteries in the prior art.

[0006] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0007] This utility model discloses a battery pack, which includes at least two battery cells arranged sequentially. Each battery cell has an electrode and a pressure relief component spaced apart on its first end face. A contactor connects the electrodes of two adjacent battery cells to connect them in series or in parallel. A temperature control device is also included, comprising multiple temperature control devices, with any two of them spaced apart. Each temperature control device includes a first temperature control device, and each first temperature control device is connected to the first end face of two adjacent battery cells. The projection of the first temperature control device onto the first end face is located in the area where the two adjacent battery cells are close to each other, thus avoiding the electrodes and the pressure relief component.

[0008] Optionally, the temperature control further includes a second temperature control, each of the second temperature control being connected to the first end face of the outermost cell, and the projection of the second temperature control on the first end face being located in the edge region of the outermost cell away from the adjacent cells, so as to avoid the electrode and the pressure relief device.

[0009] Optionally, the first temperature control and the second temperature control are disposed between the battery cell and the plate, and / or the first temperature control and the second temperature control are disposed on the side of the plate away from the battery cell.

[0010] Optionally, the battery pack has intersecting first and second directions, the first direction being the length direction of the first end face and the second direction being the width direction of the first end face; at least two of the battery cells are arranged sequentially along the second direction, and the first temperature control and the second temperature control extend along the first direction; and / or, at least two of the battery cells are arranged sequentially along the first direction, and the first temperature control and the second temperature control extend along the second direction.

[0011] Optionally, the battery pack further includes a frame, the frame having a first side beam and a second side beam arranged at relative intervals, and an end plate connected between the first side beam and the second side beam. The first side beam, the end plate, and the second side beam enclose a first receiving cavity, the battery cell is disposed in the first receiving cavity, and the first temperature control and the second temperature control are detachably connected to the first side beam and / or the second side beam; or, the first temperature control and the second temperature control are bonded to the first end face of the battery cell.

[0012] Optionally, along the first direction or the second direction, in two adjacent cells, the distance between the electrode of one cell and the side of the cell closest to the other cell is D, the width of the first temperature control is W, and the gap between two adjacent cells is d, satisfying W≤2D+d.

[0013] Optionally, along the height direction of the battery cell, the height of the first temperature control and the height of the second temperature control are both H, and the height of the portion of the electrode protruding from the first end face of the battery cell is h, satisfying h≤5mm; and / or, H≤h.

[0014] Optionally, the first temperature control includes a first temperature control body and a first protrusion. The first protrusion is connected to the side of the first temperature control body near the battery cell. The first temperature control body is disposed on the battery cell near the first end face. The first protrusion is embedded between two adjacent battery cells. The second temperature control includes a second temperature control body and a second protrusion. The second protrusion is connected to the side of the second temperature control body near the battery cell. The second temperature control body is disposed on the side of the battery cell closest to the outermost side.

[0015] Optionally, along the height direction of the battery cell, the heights of the first protrusion and the second protrusion are both H2, the height of the battery cell is H3, and the first temperature control and the second temperature control are metal parts, satisfying H2≤1 / 3H3; or, the first temperature control and the second temperature control are plastic parts, satisfying H2≤H3.

[0016] Optionally, the first temperature control and the second temperature control are provided with multiple flow channels, and the extension direction of the flow channels is the same as the extension direction of the first temperature control and the second temperature control; the flow channels are at least one of rectangular flow channels, triangular flow channels, and parallelogram flow channels.

[0017] This utility model discloses a battery pack, which includes at least two battery cells arranged sequentially. Each battery cell has an electrode and a pressure relief component spaced apart on its first end face. A contactor connects the electrodes of two adjacent battery cells to connect them in series or in parallel. A temperature control device is also included, comprising multiple temperature control devices, with any two of them spaced apart. Each temperature control device includes a first temperature control device, and each first temperature control device is connected to the first end face of two adjacent battery cells. The projection of the first temperature control device onto the first end face is located in the area where the two adjacent battery cells are close to each other, thus avoiding the electrodes and the pressure relief component.

[0018] The battery pack disclosed in this utility model includes at least two battery cells arranged sequentially. Each battery cell has an electrode and a pressure relief component spaced apart on its first end face. A contactor connects to the electrodes of two adjacent battery cells, allowing the adjacent cells to be connected in series or parallel via the contactor. Any two of a plurality of temperature control devices are spaced apart. Each temperature control device includes a first temperature control device, and each first temperature control device is connected to the first end face of two adjacent battery cells. The projection of the first temperature control device on its first end face is located close to the adjacent battery cells, allowing the first temperature control device to avoid the battery cell's electrodes and pressure relief component. This arrangement results in a smaller gap between the first temperature control device and the battery cell, thereby improving the space utilization and energy density of the battery pack.

[0019] Furthermore, the smaller gap between the first temperature control unit and the battery cell makes heat transfer between them more efficient, thereby helping to improve the temperature control performance of the battery pack. Attached Figure Description

[0020] Figure 1 This diagram illustrates the assembly structure of the battery pack described in an embodiment of the present invention.

[0021] Figure 2 This diagram illustrates the structure of the battery pack described in the embodiments of this utility model. Figure 1 ;

[0022] Figure 3 This diagram illustrates the structure of the battery pack described in the embodiments of this utility model. Figure 2 ;

[0023] Figure 4 This diagram illustrates the structure of the battery pack described in the embodiments of this utility model. Figure 3 ;

[0024] Figure 5 This is a side view of the battery pack described in an embodiment of the present invention;

[0025] Figure 6 express Figure 5 A magnified view of a section at point A in the middle;

[0026] Figure 7 This diagram illustrates the structure of the temperature control device described in this embodiment of the present invention. Figure 1 ;

[0027] Figure 8 This diagram illustrates the structure of the temperature control device described in this embodiment of the present invention. Figure 2 .

[0028] Figure label:

[0029] 10: Battery cell; 11: Electrode; 12: Pressure relief component;

[0030] 20: Temperature control unit; 23: Flow channel; 24: First temperature control unit; 241: First temperature control unit body; 242: First protrusion; 25: Second temperature control unit; 251: Second temperature control unit body; 252: Second protrusion;

[0031] 30: Papaya;

[0032] 40: Frame; 41: First side beam; 42: Second side beam;

[0033] 50: Cover;

[0034] X: First direction; Y: Second direction. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the fixed scope of the present utility model.

[0036] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0037] like Figures 1 to 8As shown in the embodiment of this application, a battery pack is disclosed. The battery pack includes at least two battery cells 10, which are arranged sequentially. Each battery cell 10 has an electrode 11 and a pressure relief component 12 spaced apart on its first end face. A switch 30 is connected to the electrodes 11 of two adjacent battery cells 10 to connect the two adjacent battery cells 10 in series or in parallel. A temperature control device 20 is included, which includes multiple temperature control devices. Any two of the multiple temperature control devices 20 are spaced apart. Each temperature control device 20 includes a first temperature control device 24. Each first temperature control device 24 is connected to the first end face of two adjacent battery cells 10, and the projection of the first temperature control device 24 on the first end face is located in the area where the two adjacent battery cells 10 are close to each other to avoid the electrodes 11 and the pressure relief component 12.

[0038] The battery pack disclosed in this application is used to store electrical energy and supply power to electrical devices. Exemplarily, the battery pack can serve as a core component of the power system of a new energy vehicle, providing power to the vehicle. In this embodiment, no excessive limitations are placed on the specific application of the battery pack. In practical applications, those skilled in the art can configure it as needed.

[0039] like Figure 2 As shown in the embodiments of this application, the battery pack includes at least two battery cells 10, which are arranged sequentially. The battery cell 10, as the core component of the battery pack, can store and release electrical energy. Each battery cell 10 has a first end face and a second end face disposed opposite to each other. An electrode 11 and a pressure relief component 12 are spaced apart on the first end face of each battery cell 10. The electrode 11 serves as a bridge connecting the battery cell 10 to an external circuit, allowing current to be transmitted from the battery cell 10 to the external circuit. When an abnormal pressure occurs inside the battery cell 10 due to electrical faults or other factors, the pressure relief component 12 automatically activates, releasing the internal pressure of the battery cell 10 and ensuring its safety.

[0040] It should be noted that in this embodiment, the first end face can be either the bottom or top surface of the battery cell 10. When the first end face is the bottom surface of the battery cell 10, the second end face is the top surface of the battery cell 10. When the first end face is the top surface of the battery cell 10, the second end face is the bottom surface of the battery cell 10. In this embodiment, there are no strict restrictions on whether the first end face is the top or bottom surface of the battery cell 10. In practical applications, technicians can set it as needed.

[0041] The following description will use the first end face as the bottom surface of the cell 10 and the second end face as the top surface of the cell 10 as an example to illustrate the battery pack disclosed in this application.

[0042] like Figure 2 , Figure 3 and Figure 4As shown, the battery pack disclosed in this application embodiment also includes a plate 30, which connects the electrodes 11 of two adjacent cells 10 to connect the two adjacent cells 10 in series or in parallel.

[0043] For example, the battery cell 10 includes a first battery cell, a second battery cell, and a third battery cell, which are arranged sequentially. The first end face of the first battery cell is provided with a first positive electrode and a first negative electrode; the first end face of the second battery cell is provided with a second positive electrode and a second negative electrode; and the first end face of the third battery cell is provided with a third positive electrode and a third negative electrode. The electrode plate 30 includes a first electrode plate and a second electrode plate. One end of the first electrode plate is connected to the first positive electrode of the first battery cell, and the other end of the first electrode plate is connected to the second negative electrode of the second battery cell. One end of the second electrode plate is connected to the second positive electrode of the second battery cell, and the other end of the second electrode plate is connected to the first negative electrode of the third battery cell, so that the first, second, and third battery cells are connected in series via the first and second electrode plates.

[0044] It should be noted that the bar sheet 30 in this embodiment can be a copper bar sheet or an aluminum bar sheet. In this embodiment, no particular restrictions are placed on the specific material of the bar sheet 30. In practical applications, those skilled in the art can choose according to their needs.

[0045] like Figure 2 , Figure 3 and Figure 4 As shown, the battery pack disclosed in this application embodiment also includes a plurality of temperature control devices 20, with any two of the plurality of temperature control devices 20 spaced apart. It can be understood that adjacent temperature control devices 20 are spaced apart. Specifically, a first temperature control device 24 is connected to the first end face of two adjacent battery cells 10, and the projection of the first temperature control device 24 onto the first end face of the battery cell 10 is located in the area where the two adjacent battery cells 10 are close to each other, so that the first temperature control device 24 does not interfere with the electrode 11 and the pressure relief device 12, thus avoiding interference with the electrode 11 and the pressure relief device 12.

[0046] The temperature control device 20 in this embodiment can monitor the temperature of the battery cell 10. When the temperature of the battery cell 10 is higher or lower than a preset temperature, the temperature control device 20 can adjust the temperature of the battery cell 10 to keep it within the preset range. This avoids the battery cell 10 being too hot or too cold, which could affect the normal use of the battery pack.

[0047] The battery pack disclosed in this embodiment of the present invention includes at least two battery cells 10, which are arranged sequentially. Each battery cell 10 has an electrode 11 and a pressure relief component 12 spaced apart on its first end face. A tab 30 is connected to the electrodes 11 of two adjacent battery cells 10, allowing the two adjacent battery cells 10 to be connected in series or in parallel via the tab 30. Any two of a plurality of temperature control devices 20 are spaced apart. Each temperature control device 20 includes a first temperature control device 24, and each first temperature control device 24 is connected to the first end face of two adjacent battery cells 10. The projection of the first temperature control device 24 on its first end face is located at a position close to the adjacent battery cells 10, so that the first temperature control device 24 can avoid the electrodes 11 and pressure relief component 12 of the battery cell 10. Through the above arrangement, the gap between the first temperature control device 24 and the battery cell 10 is small, thereby helping to improve the space utilization rate of the battery pack and increase the energy density of the battery pack. Furthermore, the smaller gap between the first temperature control element 24 and the battery cell 10 makes heat transfer between them more efficient, thereby helping to improve the temperature control performance of the battery pack.

[0048] In some embodiments, such as Figure 4 As shown, the temperature control 20 also includes a second temperature control 25. Each second temperature control 25 is connected to the first end face of the outermost cell 10, and the projection of the second temperature control 25 on the first end face is located in the edge region of the outermost cell 10 away from the adjacent cell 10, so as to avoid the electrode 11 and the pressure relief member 12.

[0049] like Figure 4 As shown in this embodiment, by connecting the second temperature control 25 to the first end face of the outermost cell 10, and with the projection of the second temperature control 25 on the first end face located at the edge region of the outermost cell 10 away from adjacent cells 10, the second temperature control 25 will not interfere with the electrode 11 and the pressure relief component 12, thus avoiding interference with the electrode 11 and the pressure relief component 12. This reduces the gap between the second temperature control 25 and the cell 10, improving the space utilization of the battery pack and increasing the energy density of the battery pack. Furthermore, a smaller gap between the second temperature control 25 and the cell 10 can also improve the efficiency of heat transfer between the second temperature control 25 and the cell 10, thereby improving the temperature control performance of the battery pack.

[0050] In some embodiments, such as Figure 2 and Figure 3 As shown, the first temperature control 24 and the second temperature control 25 are disposed between the battery cell 10 and the electrode 30; and / or, as shown Figure 4 As shown, the first temperature control 24 and the second temperature control 25 are located on the side of the plate 30 away from the cell 10.

[0051] Since the electrode 30 needs to connect to the electrodes 11 of two adjacent cells 10, it can be understood that one end of the electrode 30 is connected to the electrode 11 of one cell 10, the middle part of the electrode 30 spans the gap between two adjacent cells 10, and the other end of the electrode 30 is connected to the electrode 11 of another adjacent cell 10.

[0052] The first temperature control 24 and the second temperature control 25 can be disposed on the side of the battery pack 30 closer to the battery cell 10, or they can be disposed on the side of the battery pack 30 away from the battery cell 10. Alternatively, a portion of the first temperature control 24 and the second temperature control 25 can be disposed on the side of the battery pack 30 closer to the battery cell 10, while the remaining portion is disposed on the side of the battery pack 30 away from the battery cell 10. For example, the battery pack includes five first temperature controls 24 and two second temperature controls 25, wherein five first temperature controls 24 are disposed on the side of the battery pack 30 closer to the battery cell 10, and the other two second temperature controls 25 are disposed on the side of the battery pack 30 away from the battery cell 10.

[0053] like Figure 2 and Figure 3 As shown, the first temperature control device 24 and the second temperature control device 25 can be disposed between the battery cell 10 and the heat exchange plate 30. That is, the first temperature control device 24 and the second temperature control device 25 are disposed on the side of the heat exchange plate 30 closer to the battery cell 10. This reduces the gap between the first temperature control device 24 and the second temperature control device 25 and the battery cell 10, making heat transfer between them more efficient and thus helping to further improve the temperature control performance of the battery pack. Of course, the above arrangement can also further reduce the gap between the first temperature control device 24 and the second temperature control device 25 and the battery cell 10, thereby further improving the space utilization and energy density of the battery pack.

[0054] like Figure 4 As shown, the first temperature control 24 and the second temperature control 25 are located on the side of the battery cell 10 away from the electrode 30. By positioning the first temperature control 24 and the second temperature control 25 on the side of the battery cell 10 away from the electrode 30, it is to prevent the placement of the first temperature control 24 and the second temperature control 25 from affecting the electrical connection of the electrode 11 of the electrode 30 between two adjacent battery cells 10, thus avoiding a partial short circuit in the battery pack. In other words, the above arrangement ensures the reliability of the series or parallel connection between two adjacent battery cells 10.

[0055] In some embodiments, the battery pack has intersecting first direction X and second direction Y, where the first direction X is the length direction of the first end face and the second direction Y is the width direction of the first end face; for example Figure 2As shown, at least two battery cells 10 are arranged sequentially along the second direction Y, and the first temperature control element 24 and the second temperature control element 25 extend along the first direction X; and / or, as shown Figure 3 and Figure 4 As shown, at least two battery cells 10 are arranged sequentially along the first direction X, and the first temperature control 24 and the second temperature control 25 extend along the second direction Y.

[0056] like Figures 2 to 4 As shown in the embodiment of this application, the battery pack has intersecting first direction X and second direction Y. For example, the length direction of the first end face of the cell 10 is the first direction X, and the width direction of the first end face of the cell 10 is the second direction Y.

[0057] like Figure 2 As shown, at least two battery cells 10 are arranged sequentially along the second direction Y. The temperature control device 20 includes a first temperature control device 24, which extends along the first direction X. The first temperature control device 24 is connected to the first end face of two adjacent battery cells 10. The projection of the first temperature control device 24 on the first end face is located in the area where the two adjacent battery cells 10 are close to each other, so as to avoid the electrode 11 and the pressure relief device 12. Through the above arrangement, the gap between the first temperature control device 24 and the battery cell 10 is small, which helps to improve the space utilization of the battery pack and increase the energy density of the battery pack. Furthermore, the small gap between the first temperature control device 24 and the battery cell 10 makes the heat transfer between the first temperature control device 24 and the battery cell 10 more efficient, which helps to improve the temperature control performance of the battery pack.

[0058] And / or, the temperature control 20 includes a second temperature control 25 extending along a first direction X. The second temperature control 25 is connected to the first end face of the outermost cell 10, and the projection of the second temperature control 25 onto the first end face is located in the edge region of the outermost cell 10 away from the adjacent cell 10, to avoid the electrode 11 and the pressure relief element 12. This reduces the gap between the second temperature control 25 and the cell 10, improving the space utilization of the battery pack and increasing the energy density of the battery pack. Furthermore, a smaller gap between the second temperature control 25 and the cell 10 can also improve the efficiency of heat transfer between the second temperature control 25 and the cell 10, thereby improving the temperature control performance of the battery pack.

[0059] like Figure 3 and Figure 4As shown, at least two battery cells 10 are arranged sequentially along a first direction X. The temperature control device 20 includes a first temperature control device 24, which extends along a second direction Y. The first temperature control device 24 is connected to the first end face of two adjacent battery cells 10. The projection of the first temperature control device 24 onto the first end face is located in the area where the two adjacent battery cells 10 are close to each other, thus avoiding the electrode 11 and the pressure relief component 12. This arrangement results in a smaller gap between the first temperature control device 24 and the battery cell 10, thereby improving the space utilization and energy density of the battery pack. Furthermore, the smaller gap between the first temperature control device 24 and the battery cell 10 makes heat transfer between them more efficient, thus improving the temperature control performance of the battery pack.

[0060] And / or, the temperature control 20 includes a second temperature control 25 extending along a second direction Y. The second temperature control 25 is connected to the first end face of the outermost cell 10, and the projection of the second temperature control 25 onto the first end face is located at the edge region of the outermost cell 10 away from the adjacent cell 10, to avoid the electrode 11 and the pressure relief element 12. This reduces the gap between the second temperature control 25 and the cell 10, improving the space utilization of the battery pack and increasing the energy density of the battery pack. Furthermore, a smaller gap between the second temperature control 25 and the cell 10 can also improve the efficiency of heat transfer between the second temperature control 25 and the cell 10, thereby improving the temperature control performance of the battery pack.

[0061] In some embodiments, such as Figure 1 As shown, the battery pack also includes a frame 40, within which there are a first side beam 41 and a second side beam 42 arranged at relative intervals, and an end plate connected between the first side beam 41 and the second side beam 42. The first side beam 41, the end plate, and the second side beam 42 enclose a first receiving cavity, and the battery cell 10 is disposed in the first receiving cavity. The first temperature control 24 and the second temperature control 25 are detachably connected to the first side beam 41 and / or the second side beam 42; or, the first temperature control 24 and the second temperature control 25 are bonded to the first end face of the battery cell 10.

[0062] like Figure 1 As shown, a first side beam 41 and a second side beam 42, as well as an end plate connecting the first side beam 41 and the second side beam 42, are arranged at relatively intervals within the frame 40. The first side beam 41, the end plate of the frame 40, and the second side beam 42 enclose a first receiving cavity. The battery cell 10 is installed in the first receiving cavity to accommodate the battery cell 10.

[0063] In this embodiment, the first temperature control 24 and the second temperature control 25 are detachably connected to the first side beam 41 and / or the second side beam 42, so that the temperature control 20 can also serve as a pressure strip, making the battery pack a whole, thereby improving the overall mode of the battery pack.

[0064] For example, the first temperature control 24 and the second temperature control 25 can be detachably connected to the first side beam 41 by bolts, the first temperature control 24 and the second temperature control 25 can be detachably connected to the second side beam 42 by bolts, or the first temperature control 24 and the second temperature control 25 can be detachably connected to the first side beam 41 and the second side beam 42 by bolts.

[0065] In this embodiment, the first temperature control 24 and the second temperature control 25 can also be bonded to the first end face of the battery cell 10 to connect the first temperature control 24 and the second temperature control 25 to the first end face of the battery cell 10, thereby fixing the first temperature control 24 and the second temperature control 25, simplifying the installation method of the first temperature control 24 and the second temperature control 25, and reducing the manufacturing cost of the battery pack. Furthermore, bonding the first temperature control 24 and the second temperature control 25 to the first end face of the battery cell 10 can make the battery pack form a whole, thereby improving the overall mode of the battery pack.

[0066] For example, the first temperature control 24 and the second temperature control 25 can be glued to the first end face of the battery cell 10.

[0067] In some embodiments, such as Figure 6 As shown, along the first direction X or the second direction Y, in two adjacent cells 10, the distance between the electrode 11 of one cell 10 and the side of the cell 10 closest to the other cell 10 is D, the width of the first temperature control 24 is W, and the gap between two adjacent cells 10 is d, satisfying W≤2D+d.

[0068] like Figure 6 As shown, along the first direction X or the second direction Y, in two adjacent battery cells 10, the distance between the electrode 11 of one battery cell 10 and the side of the battery cell 10 closest to the other battery cell 10 is set as D, and the gap between two adjacent battery cells 10 is set as d. That is, in two adjacent battery cells 10, the distance between the electrode 11 of one battery cell 10 and the electrode 11 of the other battery cell 10 is 2D+d.

[0069] The width of the first temperature control 24 is W. Setting W to be less than or equal to 2D+d allows the first temperature control 24 to be positioned between the two electrodes 11 corresponding to two adjacent cells 10, thus avoiding interference between the first temperature control 24 and the electrodes 11.

[0070] In practical applications, a compression test can be performed on the battery pack to determine its reliability.

[0071] The specific test conditions for the compression test of the battery pack are as follows:

[0072] 1. Equipment for extrusion testing: an extrusion testing machine with parallel pressure plates, with the pressure plates adjusted to be perpendicular to the extension direction of electrode 11.

[0073] 2. Apply pressure: Apply the extrusion pressure at a uniform speed of 5 mm / s until the preset pressure of 13 kN is reached and then stop.

[0074] Table 1

[0075] Group D(mm) d(mm) 2D+d(mm) W(mm) reliability Test Example 1 10 2 22 25 N Test Example 2 10 2 22 20 Y Test Example 3 10 2 22 18 Y Test Example 4 10 4 24 25 N Test Example 5 10 4 24 20 Y Test Example 6 10 4 24 18 Y Test Example 7 12 2 26 30 N Test Example 8 12 2 26 22 Y Test Example 9 12 2 26 20 Y

[0076] In Table 1, N indicates that the battery pack has poor reliability, and Y indicates that the battery pack has good reliability. That is to say, the battery packs in Examples 1, 4, and 7 have poor reliability, while the battery packs in Examples 2, 3, 5, 6, 8, and 9 have good reliability.

[0077] It is understandable that if the distance 2D+d between the electrodes 11 of one battery cell 10 and the electrodes 11 of the other battery cell 10 is greater than or equal to the width W of the first temperature control 24, then the first temperature control 24 and the electrodes 11 will not interfere with each other during the compression test of the battery pack, and the reliability of the battery pack is good.

[0078] In some embodiments, such as Figure 6 As shown, along the height direction of the battery cell 10, the height of the first temperature control 24 and the second temperature control 25 are both H, and the height of the portion of the electrode 11 protruding from the first end face of the battery cell 10 is h, satisfying h≤5mm; and / or, H≤h.

[0079] like Figure 6 As shown, along the height direction of the battery cell 10, the height of the portion of the electrode 11 protruding from the first end face of the battery cell 10 is set to h, where h is less than or equal to 5 mm. For example, along the height direction of the battery cell 10, the height of the portion of the electrode 11 protruding from the first end face of the battery cell 10 can be set to 5 mm, 4 mm, 3 mm, 2 mm, 1 mm, etc.

[0080] In this embodiment, along the height direction of the cell 10, the height h of the portion of the electrode 11 protruding from the first end face of the cell 10 is set to be less than or equal to 5mm, so as to avoid the portion of the electrode 11 protruding from the first end face of the cell 10 being too high, which would affect the space utilization of the battery pack.

[0081] like Figure 6 As shown, along the height direction of the battery cell 10, the heights of the first temperature control device 24 and the second temperature control device 25 are set to H, where H is less than or equal to h. That is, along the height direction of the battery cell 10, the heights of the first temperature control device 24 and the second temperature control device 25 are the same as the height of the portion of the electrode 11 protruding from the first end face of the battery cell 10, or the heights of the first temperature control device 24 and the second temperature control device 25 are less than the height of the portion of the electrode 11 protruding from the first end face of the battery cell 10.

[0082] In this embodiment, the heights of the first temperature control 24 and the second temperature control 25 are set to be less than or equal to the height of the portion of the electrode 11 protruding from the first end face of the cell 10, so as to avoid the heights of the first temperature control 24 and the second temperature control 25 being greater than the height of the portion of the electrode 11 protruding from the first end face of the cell 10, which would affect the space utilization of the battery pack and reduce the energy density of the battery pack.

[0083] For example, along the height direction of the battery cell 10, the heights of the first temperature control 24 and the second temperature control 25 can be set to 5mm, 4mm, 3mm, 2mm, 1mm, etc.

[0084] In some embodiments, such as Figure 7 As shown, the first temperature control 24 includes a first temperature control body 241 and a first protrusion 242. The first protrusion 242 is connected to the side of the first temperature control body 241 near the battery cell 10. The first temperature control body 241 is located near the first end face of the battery cell 10, and the first protrusion 242 is embedded between two adjacent battery cells 10. The second temperature control 25 includes a second temperature control body 251 and a second protrusion 252. The second protrusion 252 is connected to the side of the second temperature control body 251 near the battery cell 10. The second temperature control body 251 is located near the first end face of the battery cell 10, and the second protrusion 252 is located on the side of the battery cell 10 closest to the outermost side.

[0085] The first temperature control 24 disclosed in this application includes a first temperature control body 241 and a first protrusion 242 connected to the first temperature control body 241 near the side of the battery cell 10. For example... Figure 7 As shown, the first protrusion 242 is connected to the middle position of the first temperature control body 241, and the first temperature control body 241 and the first protrusion 242 form a T-shaped first temperature control 24.

[0086] The second temperature control 25 disclosed in this application includes a second temperature control body 251 and a second protrusion 252 connected to the second temperature control body 251 near the battery cell 10. For example... Figure 8 As shown, the second protrusion 252 is connected to one end of the second temperature control body 251, and the second temperature control body 251 and the second protrusion 252 form an L-shaped structure of the second temperature control 25.

[0087] If the structure of the first temperature control unit 24 is Figure 7As shown, during the installation of the first temperature control device 24, the body 241 of the first temperature control device can be positioned near the first end face of the battery cell 10, and the first protrusion 242 can be embedded between two adjacent battery cells 10. The temperature of the first end face of the battery cell 10 can be adjusted by the body 241, and the temperature of the adjacent sides of the two battery cells 10 can be adjusted by the first protrusion 242, thereby further improving the heat transfer efficiency between the first temperature control device 24 and the battery cell 10, and further improving the temperature control performance of the battery pack.

[0088] If the structure of the second temperature control unit 25 is Figure 8 As shown, during the installation of the second temperature control 25, the body 251 of the second temperature control 25 can be positioned near the first end face of the battery cell 10, and the second protrusion 252 can be positioned on the side of the battery cell 10 closest to the outermost edge. This allows the temperature of the first end face of the battery cell 10 to be adjusted via the body 251, and the temperature of the side of the battery cell 10 closest to the outermost edge to be adjusted via the second protrusion 252. This further improves the heat transfer efficiency between the second temperature control 25 and the battery cell 10, thereby further enhancing the temperature control performance of the battery pack.

[0089] In some embodiments, such as Figure 7 As shown, along the height direction of the battery cell 10, the heights of the first protrusion 242 and the second protrusion 252 are both H2, the height of the battery cell 10 is H3, the first temperature control 24 and the second temperature control 25 are metal parts, satisfying H2≤1 / 3H3; or, the first temperature control 24 and the second temperature control 25 are plastic parts, satisfying H2≤H3.

[0090] When the first temperature control 24 and the second temperature control 25 are metal parts, the height H2 of the first protrusion 242 and the second protrusion 252 along the height direction of the battery cell 10 is set to be less than or equal to 1 / 3 of the height H3 of the battery cell 10. This allows the temperature of the battery cell 10 to be adjusted via the first temperature control 24 and the second temperature control 25, while simultaneously limiting the movement of the battery cell 10 via the first protrusion 242 and the second protrusion 252.

[0091] When the first temperature control element 24 and the second temperature control element 25 are made of plastic, the height H2 of the first protrusion 242 and the second protrusion 252 along the height direction of the battery cell 10 is set to be less than or equal to the height H3 of the battery cell 10. This allows the temperature of the first end face of the battery cell 10 to be adjusted via the first temperature control element body 241 and the second temperature control element body 251, and the temperature of the side surface of the battery cell 10 to be adjusted via the first protrusion 242 and the second protrusion 252, thereby improving the temperature control efficiency of the battery cell 10.

[0092] In practical applications, the temperature uniformity at different locations within the battery cell 10 can be tested to determine the temperature control efficiency of the battery cell 10. Specifically, the temperature at multiple locations within the battery cell 11 can be monitored, and the temperatures at multiple locations within the battery cell 10 can be compared. If the temperature difference between different locations within the battery cell 10 is ≤3℃, the temperature control efficiency of the battery cell 10 is good, as shown in Examples 1, 2, and 3 in Tables 2 and 3, i.e., the temperature control efficiency is Y. If the temperature difference between different locations within the battery cell 10 is >3℃, the temperature control efficiency of the battery cell 10 is poor, as shown in Examples 4, 5, and 6 in Tables 2 and 3, i.e., the temperature control efficiency is N.

[0093] When the first temperature control 24 and the second temperature control 25 are metal parts, a first temperature measuring point can be set on the first end face of the battery cell 10, and the temperature of the first temperature measuring point is K1. A second temperature measuring point can be set on the second end face of the battery cell 10, and the temperature of the second temperature measuring point is K2. A third temperature measuring point can be set on the side of the battery cell 10, and the temperature of the third temperature measuring point is K3.

[0094] Table 2

[0095]

[0096] As can be seen from the test results in Table 2, when the first temperature control element 24 and the second temperature control element 25 are metal parts, the ratio between the height H2 of the first protrusion 242 and the second protrusion 252 and the height H3 of the battery cell 10 is less than or equal to 1 / 3, which can make the temperature control efficiency of the battery cell 10 better.

[0097] When the first temperature control 24 and the second temperature control 25 are plastic parts, a fourth temperature measuring point can be set on the first end face of the battery cell 10, and the temperature of the fourth temperature measuring point is K4. A fifth temperature measuring point can be set on the second end face of the battery cell 10, and the temperature of the fifth temperature measuring point is K5. A sixth temperature measuring point can be set on the side of the battery cell 10, and the temperature of the sixth temperature measuring point is K6.

[0098] Table 3

[0099]

[0100] As can be seen from the test results in Table 3, when the first temperature control component 24 and the second temperature control component 25 are plastic parts, the temperature control efficiency of the battery cell 10 will be better when the ratio between the height H2 of the first protrusion 242 and the second protrusion 252 and the height H3 of the battery cell 10 is less than or equal to 1.

[0101] In some embodiments, such as Figure 7 and Figure 8As shown, the first temperature control 24 and the second temperature control 25 are provided with a plurality of flow channels 23, and the extension direction of the flow channels 23 is the same as the extension direction of the first temperature control 24 and the second temperature control 25; the flow channels 23 are at least one of rectangular flow channels, triangular flow channels, and parallelogram flow channels.

[0102] like Figure 7 and Figure 8 As shown in this embodiment, multiple flow channels 23 are provided within the first temperature control 24 and the second temperature control 25. The flow channels 23 are used to carry coolant, such as water. The extending direction of the flow channels 23 is the same as the extending direction of the first temperature control 24 and the second temperature control 25. The provision of the flow channels 23 can increase the flow rate of the coolant, thereby improving the temperature control efficiency of the battery cell 10.

[0103] In this embodiment, along the height direction of the cell 10, the cross-section of the flow channel 23 can be a rectangular structure, also referred to as a rectangular flow channel. Along the height direction of the cell 10, the cross-section of the flow channel 23 can be a triangular structure, also referred to as a triangular flow channel. Along the height direction of the cell 10, the cross-section of the flow channel 23 can also be a parallelogram structure, also referred to as a parallelogram flow channel.

[0104] In this embodiment, no excessive restrictions are placed on the specific structure of the flow channel 23. In practical applications, those skilled in the art can set the specific structure of the flow channel 23 as needed.

[0105] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0106] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the present invention.

[0107] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0108] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery pack, characterized in that, include: At least two battery cells (10) are arranged in sequence, and each battery cell (10) has an electrode (11) and a pressure relief component (12) spaced apart on its first end face; A plate (30) is connected to the electrodes (11) of two adjacent cells (10) to connect the two adjacent cells (10) in series or in parallel. Temperature control (20), the temperature control (20) includes a plurality of them, any two of the plurality of temperature control (20) are spaced apart, the temperature control (20) includes a first temperature control (24), each first temperature control (24) is connected to the first end face of two adjacent cells (10), and the projection of the first temperature control (24) on the first end face is located in the area where the two adjacent cells (10) are close to each other, so as to avoid the electrode (11) and the pressure relief component (12).

2. The battery pack according to claim 1, characterized in that, The temperature control (20) also includes a second temperature control (25). Each of the second temperature control devices (25) is connected to the first end face of the outermost cell (10), and the projection of the second temperature control device (25) on the first end face is located in the edge region of the outermost cell (10) away from the adjacent cell (10) to avoid the electrode (11) and the pressure relief device (12).

3. The battery pack according to claim 2, characterized in that, The first temperature control (24) and the second temperature control (25) are disposed between the battery cell (10) and the plate (30), and / or the first temperature control (24) and the second temperature control (25) are disposed on the side of the plate (30) away from the battery cell (10).

4. The battery pack according to claim 2, characterized in that, The battery pack has intersecting first direction (X) and second direction (Y), where the first direction (X) is the length direction of the first end face and the second direction (Y) is the width direction of the first end face. At least two of the battery cells (10) are arranged sequentially along the second direction (Y), and the first temperature control (24) and the second temperature control (25) extend along the first direction (X); And / or, at least two of the battery cells (10) are arranged sequentially along the first direction (X), and the first temperature control (24) and the second temperature control (25) extend along the second direction (Y).

5. The battery pack according to claim 2, characterized in that, The battery pack also includes a frame (40), which has a first side beam (41) and a second side beam (42) arranged at relative intervals, and an end plate connected between the first side beam (41) and the second side beam (42). The first side beam (41), the end plate and the second side beam (42) enclose a first receiving cavity. The battery cell (10) is disposed in the first receiving cavity, and the first temperature control (24) and the second temperature control (25) are detachably connected to the first side beam (41) and / or the second side beam (42). Alternatively, the first temperature control (24) and the second temperature control (25) are bonded to the first end face of the battery cell (10).

6. The battery pack according to claim 4, characterized in that, Along the first direction (X) or the second direction (Y), in two adjacent cells (10), the distance between the electrode (11) of one cell (10) and the side of the cell (10) near the other cell (10) is D, the width of the first temperature control (24) is W, and the gap between two adjacent cells (10) is d, satisfying W≤2D+d.

7. The battery pack according to claim 2, characterized in that, Along the height direction of the battery cell (10), the height of the first temperature control (24) and the second temperature control (25) is H, and the height of the portion of the electrode (11) protruding from the first end face of the battery cell (10) is h, satisfying h≤5mm; and / or, H≤h.

8. The battery pack according to claim 2, characterized in that, The first temperature control (24) includes a first temperature control body (241) and a first protrusion (242). The first protrusion (242) is connected to the side of the first temperature control body (241) near the battery cell (10). The first temperature control body (241) is disposed on the battery cell (10) near the first end face. The first protrusion (242) is embedded between two adjacent battery cells (10). The second temperature control (25) includes a second temperature control body (251) and a second protrusion (252). The second protrusion (252) is connected to the side of the second temperature control body (251) near the battery cell (10). The second temperature control body (251) is located on the battery cell (10) near the first end face. The second protrusion (252) is located on the side of the battery cell (10) closest to the outermost side.

9. The battery pack according to claim 8, characterized in that, Along the height direction of the battery cell (10), the heights of the first protrusion (242) and the second protrusion (252) are both H2, and the height of the battery cell (10) is H3. The first temperature control (24) and the second temperature control (25) are metal parts, satisfying H2≤1 / 3H3; Alternatively, the first temperature control (24) and the second temperature control (25) are plastic parts, satisfying H2≤H3.

10. The battery pack according to claim 2, characterized in that, The first temperature control (24) and the second temperature control (25) are provided with a plurality of flow channels (23), and the extension direction of the flow channels (23) is the same as the extension direction of the first temperature control (24) and the second temperature control (25); The flow channel (23) is at least one of a rectangular flow channel, a triangular flow channel, and a parallelogram flow channel.

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