Battery pack and electric device
By designing heat management components in the battery pack, including a temperature uniform part, a first heat exchange part and a second heat exchange part, and optimizing the position of the pressure relief part by using the exhaust hole, the thermal management problem of the battery pack under high-rate charging and discharging conditions is solved, and more efficient cooling effect and better safety are achieved.
Patent Information
- Application Number
- CN202421848031.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing battery packs cannot effectively cool down under high-rate charging and discharging conditions, and the thermal management components cannot effectively cool down, resulting in a sharp increase in the battery temperature and unsatisfactory heat dissipation effect.
A battery pack is designed, and its heat management component includes a temperature uniform part, a first heat exchange part and a second heat exchange part arranged in the second direction. The electrode terminal is connected to the heat management part. The temperature uniform part has an exhaust hole so that the pressure relief member can open the space to achieve efficient cooling of the top cover sheet and the electrode terminal.
By increasing the contact cooling area and setting exhaust holes, more effective thermal management is achieved, the battery temperature is reduced, and the safety and heat dissipation effect of the battery pack are improved.
Smart Images
Figure CN222995554U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of batteries, and particularly relates to a battery pack and an electrical device. Background Art
[0002] When the battery is charged and discharged at high rates and fast charged and discharged, a large amount of heat will be generated, the battery temperature will rise sharply, and the corresponding heat dissipation requirements will also become higher and higher. At present, a liquid cooling plate is used in the battery pack to dissipate heat from the battery. However, a conventional liquid cooling plate can only cool flat objects. For an object with steps, since the contact surface is limited by the steps and is small, a good temperature reduction and cooling effect cannot be achieved. Summary of the Utility Model
[0003] Purpose of the Utility Model: The embodiments of this application provide a battery pack, aiming to solve the problem that the existing heat management components have a small contact surface with objects with steps, resulting in an unsatisfactory temperature reduction effect; another purpose of the embodiments of this application is to provide an electrical device.
[0004] Technical Solution: A battery pack described in the embodiments of this application has an intersecting third direction and second direction, and includes:
[0005] A battery cell, including a top cover sheet, a pressure relief member, and electrode terminals. The top cover sheet is provided with a pressure relief hole. The pressure relief member is connected to the top cover sheet and seals the pressure relief hole. The electrode terminals are arranged at intervals along the second direction with respect to the pressure relief member and are connected to the top cover sheet;
[0006] A heat management component, including a temperature equalizing portion, a first heat exchange portion, and a second heat exchange portion arranged along the second direction. The first heat exchange portion and the second heat exchange portion are connected. The temperature equalizing portion is connected to a side of the first heat exchange portion away from the second heat exchange portion; along the third direction, the electrode terminals protrude from a side of the top cover sheet facing the heat management component. The first heat exchange portion is connected to the top cover sheet, the second heat exchange portion is connected to the electrode terminals, and the second heat exchange portion is arranged at intervals along the third direction with respect to the top cover sheet; the temperature equalizing portion has an exhaust hole, and the exhaust hole penetrates the temperature equalizing portion along the third direction; along the third direction, the orthographic projection of the pressure relief member on the heat management component is at least partially located in the exhaust hole.
[0007] In some embodiments, the battery cell includes two electrode terminals spaced apart along the second direction, the first heat exchange portion is disposed between the two electrode terminals along the second direction, the pressure relief member is disposed between the two electrode terminals along the second direction, and the pressure relief member is spaced apart from each electrode terminal; the thermal management component includes a plurality of second heat exchange portions, the plurality of second heat exchange portions are spaced apart along the second direction, the first heat exchange portion and the temperature equalizing portion are disposed between two adjacent second heat exchange portions along the second direction, and each electrode terminal is connected to at least one second heat exchange portion.
[0008] In some embodiments, along the third direction, the pressure relief component and the temperature equalizing portion are spaced apart; and the first heat exchange portion is disposed between the pressure relief component and the electrode terminal along the second direction.
[0009] In some embodiments, the thermal management component includes a plurality of the first heat exchange parts, and the plurality of the first heat exchange parts are connected and arranged between two adjacent second heat exchange parts along the second direction; at least one first heat exchange part is provided between each of the electrode terminals and the pressure relief part, and the pressure relief part is arranged between two adjacent first heat exchange parts, and the temperature equalizing part is respectively connected to the two first heat exchange parts located on both sides of the pressure relief part.
[0010] In some embodiments, the two first heat exchange parts and the temperature equalizing part located on both sides of the pressure relief part are surrounded by a first groove, the opening of the first groove faces the top cover sheet, and the exhaust hole is connected to the first groove; along the third direction, the orthographic projection of the pressure relief part on the thermal management component is located in the first groove.
[0011] In some embodiments, the first heat exchange part has a first heat exchange cavity; the second heat exchange part has a second heat exchange cavity, and the first heat exchange cavity is connected to the second heat exchange cavity.
[0012] In some embodiments, the thermal management component has:
[0013] a first plate body, disposed on one side of the battery cell along the third direction, the first plate body being connected to the electrode terminal;
[0014] A first convex portion is arranged along the third direction on a side of the first plate body facing the battery cell, the first convex portion is connected to the first plate body, and a side of the first convex portion facing away from the first plate body is connected to the top cover sheet;
[0015] a second groove, penetrating the first plate body along the third direction and recessed into the first convex portion;
[0016] A second plate body is disposed on a side of the first plate body away from the battery cell along the third direction;
[0017] A second convex portion is disposed on a side of the second plate body away from the first plate body along the third direction. The second convex portion is connected to the second plate body, and a positive projection of the second convex portion on the battery cell along the third direction is at least partially located on the electrode terminal;
[0018] A third groove penetrates through the second plate body along the third direction and depresses into the second convex portion;
[0019] Wherein, the first plate body is connected to the second plate body, the first plate body seals the third groove to form the second heat exchange cavity, and the second plate body seals the second groove to form the first heat exchange cavity; the exhaust hole penetrates through the first plate body and the second plate body along the third direction.
[0020] In some embodiments, the battery pack has a first direction intersecting with the third direction and the second direction. The battery pack includes a plurality of battery cells and a plurality of connectors. The connectors are disposed on a side of the battery cells facing the thermal management component along the third direction. The plurality of battery cells are arranged along the first direction, and each connector connects the electrode terminals of two adjacent battery cells along the first direction; the first heat exchange portion extends along the first direction, and the first heat exchange portion is respectively connected to the top cover sheets of the plurality of battery cells; the second heat exchange portion extends along the first direction, and the second heat exchange portion is respectively connected to the electrode terminals of the plurality of battery cells; the thermal management component has a plurality of the exhaust holes. The plurality of exhaust holes penetrate through the temperature equalizing portion along the third direction, and the plurality of exhaust holes are spaced along the first direction. Each exhaust hole is disposed opposite to a pressure relief member along the third direction.
[0021] In some embodiments, the plurality of battery cells are arranged along the first direction to form a battery pack, and the battery pack includes:
[0022] A plurality of the battery packs, and the plurality of battery packs are arranged along the second direction;
[0023] A plurality of the thermal management components, and the plurality of thermal management components are arranged and connected along the second direction. Each thermal management component is connected to a battery pack.
[0024] Correspondingly, an electrical device according to an embodiment of the present application includes the battery pack as described in any one of the foregoing embodiments, and the battery pack is used to supply power to the electrical device.
[0025] Beneficial effects: Compared with the prior art, a battery pack according to an embodiment of the present application has an intersecting third direction and second direction, and includes battery cells and a thermal management component; the battery cells include a top cover sheet, a pressure relief member, and electrode terminals. The top cover sheet is provided with a pressure relief hole, the pressure relief member is connected to the top cover sheet and seals the pressure relief hole, and the electrode terminals are arranged at intervals from the pressure relief member along the second direction and are connected to the top cover sheet. The thermal management component includes a first heat exchange portion and a second heat exchange portion arranged along the second direction, and the first heat exchange portion and the second heat exchange portion are connected; along the third direction, the electrode terminals protrude from the side of the top cover sheet facing the thermal management component, the first heat exchange portion is connected to the top cover sheet, the second heat exchange portion is connected to the electrode terminals, and the second heat exchange portion is arranged at intervals from the top cover sheet along the third direction; the temperature equalizing portion has an exhaust hole, and the exhaust hole penetrates the temperature equalizing portion along the third direction; along the third direction, the orthographic projection of the pressure relief member on the thermal management component is at least partially located within the exhaust hole. By providing the connection between the first heat exchange portion and the top cover sheet and the connection between the second heat exchange portion and the electrode terminals, the present application enables the thermal management component to cool the top cover sheet and the electrode terminals respectively. Thus, for a battery cell with a height difference between the top cover sheet and the electrode terminals, a larger contact cooling area can be obtained, and a better cooling effect can be achieved; at the same time, by providing an exhaust hole on the thermal management component, an opening space can be provided for the pressure relief member when the thermal management component is arranged on one side of the top cover sheet, which is beneficial for timely exhausting gas when the battery cell is thermally out of control and ensures the safety of the battery pack; in addition, the temperature equalizing portion can transfer the heat of the first heat exchange portion in a direction away from the second heat exchange portion, improving the temperature uniformity of the thermal management component and optimizing the cooling effect on the top cover sheet.
[0026] Compared with the prior art, an electrical device according to an embodiment of the present application includes the battery pack as described in any one of the foregoing embodiments, and the battery pack is used to supply power to the electrical device. It can be understood that the electrical device according to the embodiment of the present application includes all the technical features and technical effects of the foregoing battery pack, which will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings 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 efforts.
[0028] Figure 1 is a schematic diagram of the overall structure of the battery pack according to the embodiment of the present application;
[0029] Figure 2 is an exploded view of the battery pack according to the embodiment of the present application;
[0030] Figure 3 is Figure 2 an enlarged view of part A in
[0031] Figure 4 is a top view of the battery pack according to an embodiment of the present application;
[0032] Figure 5 is Figure 4 an enlarged view of part B in
[0033] Figure 6 is Figure 4 a sectional view taken along the A-A section in
[0034] Figure 7 is Figure 4 a sectional view taken along the B-B section in
[0035] Figure 8 is Figure 7 an enlarged view of part C in
[0036] Figure 9 an enlarged view of the thermal management component according to an embodiment of the present application;
[0037] Figure 10 is a structural schematic diagram of the structure related to the first plate body;
[0038] Figure 11 is a structural schematic diagram of the structure related to the second plate body.
[0039] Reference numerals: 100, battery pack; 1, battery cell; 11, top cover sheet; 111, pressure relief hole; 12, electrode terminal; 13, pressure relief member; 2, thermal management component; 21, first heat exchange part; 211, first heat exchange cavity; 22, second heat exchange part; 221, second heat exchange cavity; 23, first groove; 24, temperature equalizing part; 241, exhaust hole; 25, first plate body; 26, first convex part; 27, second groove; 28, second plate body; 29, second convex part; 20, third groove; 3, connecting member; X, first direction; Y, second direction; Z, third direction. Detailed implementation manners
[0040] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.
[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 thus should not be construed as a limitation to 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 specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, and "at least one" means one, two or more, unless otherwise specifically defined. In the description of the present application, "vertical" means completely vertical at 90° or almost completely vertical. For example, within the range of an included angle of 80° to 100°, it is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel. For example, within the range of 10° of complete parallelism, it is considered parallel.
[0042] It should also be noted that in the drawings of the present application, an arrow marked with X indicates the first direction X, an arrow marked with Y indicates the second direction Y, and an arrow marked with Z indicates the third direction Z. The introduction of the first direction X, the second direction Y, and the third direction Z is for the convenience of describing the structural positional relationship of the battery pack, and thus facilitating the understanding of its structure. In the embodiments of the present application, the first direction X is the arrangement direction of a plurality of battery cells, the second direction Y is the arrangement direction of the first heat exchange part and the second heat exchange part, the second direction Y is also the length direction of the battery cell, the third direction Z is the arrangement direction of the battery cell and the thermal management component, and the third direction Z is also the height direction of the battery cell; and the first direction X, the second direction Y, and the third direction Z intersect with each other. Further, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.
[0043] With the rapid development of the battery industry, the demand for fast charging, fast discharging, and high-rate charging and discharging of batteries is increasing, and correspondingly, the requirements for heat dissipation are also getting higher and higher. Conventional stamping and brazing liquid cooling plates can only cool flat objects. For a battery with electrode terminals protruding outside, due to the presence of stepped surfaces with different heights, when cooling is performed by arranging a liquid cooling plate on the side where the battery electrode terminals are located, the cooling effect is not ideal due to the limited contact cooling area.
[0044] In view of this, the embodiments of the present application provide a battery pack, aiming to solve the above technical problems.
[0045] Please refer to Figures 1-4 and Figure 7, an embodiment of the present application provides a battery pack having an intersecting third direction Z and second direction Y, including a battery cell 1 and a thermal management component 2; the battery cell 1 includes a top cover sheet 11, a pressure relief component 13, and an electrode terminal 12. The top cover sheet 11 is provided with a pressure relief hole 111. The pressure relief component 13 is connected to the top cover sheet 11 and seals the pressure relief hole 111. The electrode terminal 12 is spaced from the pressure relief component 13 along the second direction Y and is connected to the top cover sheet 11. The thermal management component 2 includes a temperature equalizing part 24, a first heat exchange part 21, and a second heat exchange part 22 arranged along the second direction Y. The first heat exchange part 21 and the second heat exchange part 22 are connected. The temperature equalizing part 24 is connected to a side of the first heat exchange part 21 away from the second heat exchange part 22; along the third direction Z, the electrode terminal 12 protrudes from a side of the top cover sheet 11 facing the thermal management component 2. The first heat exchange part 21 is connected to the top cover sheet 11, the second heat exchange part 22 is connected to the electrode terminal 12, and the second heat exchange part 22 is spaced from the top cover sheet 11 along the third direction Z. The temperature equalizing part 24 has an exhaust hole 241, and the exhaust hole 241 penetrates the temperature equalizing part 24 along the third direction Z; along the third direction Z, the orthographic projection of the pressure relief component 13 on the thermal management component 2 is at least partially located in the exhaust hole 241.
[0046] In the embodiment of the present application, by setting the first heat exchange part 21 to be connected to the top cover sheet 11 and the second heat exchange part 22 to be connected to the electrode terminal 12, the thermal management component 2 cools the top cover sheet 11 and the electrode terminal 12 respectively. In this way, for the battery cell 1 with a height difference between the top cover sheet 11 and the electrode terminal 12, a larger contact cooling area can be obtained, and thus a better cooling effect can be achieved; at the same time, by providing an exhaust hole 241 on the thermal management component 2, an opening space can be provided for the pressure relief component 13 when the thermal management component 2 is arranged on one side of the top cover sheet 11, which is beneficial to exhausting gas in time when the battery cell 1 is out of control thermally and ensures the safety of the battery pack; in addition, the temperature equalizing part 24 can transfer the heat of the first heat exchange part 21 in a direction away from the second heat exchange part 22, improving the temperature uniformity of the thermal management component 2 and optimizing the cooling effect on the top cover sheet 11.
[0047] Specifically, in the embodiment of the present application, the thermal management component 2 can be a liquid cooling plate, and the electrode terminal 12 is the pole column of the battery cell 1. The thermal management component 2 includes two heat exchange parts (the first heat exchange part 21 and the second heat exchange part 22) to cool the top cover sheet 11 and the electrode terminal 12 at different heights along the third direction Z respectively. Among them, the first heat exchange part 21 is connected to the top cover sheet 11 for contact heat exchange, and the second heat exchange part 22 is spaced from the top cover sheet 11 along the third direction Z, and a side of the second heat exchange part 22 facing the top cover sheet 11 is connected to the electrode terminal 12, so as to achieve large-area contact heat exchange on the side where the electrode terminal 12 of the battery cell 1 is located and improve the heat exchange effect.
[0048] It can be understood that in the embodiment of the present application, there is a height difference between the first heat exchange part 21 and the second heat exchange part 22 along the third direction Z on the side facing the battery cell 1, so a stepped structure can be formed accordingly to adapt to the stepped surface structure on the side where the electrode terminal 12 of the battery cell 1 is located, thereby achieving better heat exchange and cooling effects.
[0049] It should be noted that, in the embodiment of the present application, the first heat exchange part 21 and the second heat exchange part 22 are connected as a whole, which is convenient for the disassembly and assembly of the heat management component 2. Furthermore, the first heat exchange part 21 and the second heat exchange part 22 are both provided with a heat exchange cavity, and the heat exchange cavities of the two are connected, so that the heat exchange medium flowing in the heat exchange cavities of the first heat exchange part 21 and the second heat exchange part 22 also flows in the heat exchange cavities of the two, so that the first heat exchange part 21 and the second heat exchange part 22 can share a liquid inlet and a liquid outlet.
[0050] It should also be noted that in the embodiment of the present application, an exhaust hole 241 is provided on the thermal management component 2, and the corresponding orthographic projection of the pressure relief member 13 along the third direction Z on the thermal management component 2 can be partially located in the exhaust hole 241 or completely located in the exhaust hole 241. At this time, when the battery cell 1 thermally runs away and the pressure relief member 13 explodes, the exhaust hole 241 provides a passage for the thermal runaway gas to be discharged, so that the thermal runaway gas is discharged to the side of the thermal management component 2 away from the battery cell 1, and the thermal runaway gas is discharged with the help of the pressure relief valve on the battery pack, thereby reducing the possibility of explosion of the battery pack.
[0051] It should also be noted that the first heat exchange portion 21 and the second heat exchange portion 22 of the thermal management component 2 of the embodiment of the present application are arranged and connected along the second direction Y, and are connected to the top cover sheet 11 through the first heat exchange portion 21. At this time, the pressure relief member 13 and the exhaust hole 241 are arranged opposite to each other. When the pressure relief member 13 is opened to relieve pressure, the thermal runaway gas and the high-temperature molten material are partially isolated through the connection 2 between the first heat exchange portion 21 and the top cover sheet 11, and the thermal runaway gas and the high-temperature molten material are then discharged through the exhaust hole 241 to the side of the thermal management component 2 away from the battery cell 1, thereby achieving further isolation of the thermal runaway gas and the high-temperature molten material, so that when there are multiple battery cells 1 in the battery pack, the battery cells 1 that are not out of control are effectively protected, and short circuits of adjacent battery cells 1 are also effectively prevented.
[0052] In some embodiments, the battery cell 1 includes two electrode terminals 12 spaced apart in the second direction Y. The first heat exchange part 21 is arranged between the two electrode terminals 12 in the second direction Y. The pressure relief part 13 is arranged between the two electrode terminals 12 in the second direction Y, and the pressure relief part 13 is spaced apart from each electrode terminal 12; the thermal management component 2 includes a plurality of second heat exchange parts 22, and the plurality of second heat exchange parts 22 are spaced apart in the second direction Y. The first heat exchange part 21 and the temperature equalizing part 24 are arranged between two adjacent second heat exchange parts 22 in the second direction Y, and each electrode terminal 12 is connected to at least one second heat exchange part 22.
[0053] In the embodiment of the present application, the battery cell 1 is a square shell battery. At this time, there are two electrode terminals 12 spaced apart in the second direction Y. The pressure relief part 13, that is, the explosion-proof valve, is located between the two electrode terminals 12. The plurality of second heat exchange parts 22 can be two second heat exchange parts 22. At this time, the two second heat exchange parts 22 are respectively connected to the two electrode terminals 12 in one-to-one correspondence, so that the two electrode terminals 12 can be respectively heat-exchanged and cooled. The plurality of second heat exchange parts 22 can also be more than two second heat exchange parts 22. At this time, one electrode terminal 12 is connected to at least one second heat exchange part 22 or a plurality of second heat exchange parts 22.
[0054] It should be noted that when the number of the second heat exchange parts 22 exceeds two, preferably the number of the second heat exchange parts 22 is two. At this time, the two electrode terminals 12 can be respectively connected to the same number of second heat exchange parts 22 to realize uniform heat exchange and cooling of the two electrode terminals 12. The plurality of second heat exchange parts 22 are arranged in the second direction Y. When each electrode terminal 12 is connected to two or more second heat exchange parts 22, at this time, the size of the second heat exchange part 22 in the second direction Y can be correspondingly reduced, so that the heat exchange medium can be shunted into the plurality of second heat exchange parts 22, and uniform heat exchange and cooling can be realized.
[0055] It should also be noted that in the embodiment of the present application, the first heat exchange part 21 is arranged between two adjacent second heat exchange parts 22 at intervals. The first heat exchange part 21 is connected to the second heat exchange part 22. At this time, the two can be connected through the temperature equalizing part 24 to realize the heat exchange between the first heat exchange part 21 and the second heat exchange part 22, and realize the temperature equalization of the thermal management component. At the same time, the first heat exchange part 21 is located between the two electrode terminals 12, and can realize the cooling of a part of the top cover sheet 11 between the two electrode terminals 12.
[0056] In some embodiments, along the third direction Z, the pressure relief part 13 is spaced apart from the temperature equalizing part 24; along the second direction Y, the pressure relief part 13 is arranged between the two electrode terminals 12, and the pressure relief part 13 is spaced apart from each electrode terminal 12; the first heat exchange part 21 is arranged between the pressure relief part 13 and the electrode terminal 12 in the second direction Y.
[0057] In the embodiment of the present application, the pressure relief member 13 is disposed between the two electrode terminals 12. The pressure relief member 13 is located in an area where relative pressure is likely to concentrate and the structural strength is relatively low, so that the pressure relief can be timely opened when thermal runaway occurs inside the battery cell 1. The pressure relief member 13 and the thermal management component 2 are spaced apart, so as to provide space for the opening of the pressure relief member 13 and reduce the possibility of interference of the thermal management component 2 with the opening of the pressure relief member 13. The first heat exchange part 21 is disposed between the pressure relief member 13 and the electrode terminal 12. At this time, the first heat exchange part 21 will not interfere with the opening of the pressure relief member 13 either, and the first heat exchange part 21 is directly in contact with the top cover sheet 11 to cool the top cover sheet 11. Therefore, there is a space between the pressure relief member 13 and the thermal management component 2 in the embodiment of the present application, which is beneficial to the opening of the pressure relief. At the same time, since the pressure relief member 13 is disposed on the side of the first heat exchange part 21 away from the electrode terminal 12, the exhaust hole 241 is also located on the side of the first heat exchange part 21 away from the electrode terminal 12. Only in this way can the exhaust hole 241 and the pressure relief member 13 be at least partially opposite in the third direction Z. At this time, when the pressure relief member 13 is opened, the thermal runaway gas and the high-temperature molten matter will be ejected towards the exhaust hole 241 under the action of high pressure, and reach the side of the thermal management component 2 away from the battery cell 1 through the exhaust hole 241, and the thermal management component 2 is used to isolate most of the thermal runaway gas and the high-temperature molten matter to avoid more serious influence on the battery cell 1.
[0058] In some embodiments, the thermal management component 2 includes a plurality of first heat exchange parts 21. The plurality of first heat exchange parts 21 are connected and disposed between two second heat exchange parts 22 adjacent in the second direction Y; at least one first heat exchange part 21 is provided between each electrode terminal 12 and the pressure relief member 13, and the pressure relief member 13 is disposed between two adjacent first heat exchange parts 21. The temperature equalizing part 24 is respectively connected to the two first heat exchange parts 21 located on both sides of the pressure relief member 13.
[0059] In the embodiment of the present application, the plurality of first heat exchange parts 21 are disposed between two adjacent second heat exchange parts 22. At this time, the plurality of first heat exchange parts 21 are located between the two electrode terminals 12 to exchange heat and cool the top cover sheet 11. The plurality of first heat exchange parts 21 may be two. At this time, the two first heat exchange parts 21 are respectively disposed on both sides of the pressure relief member 13 in the second direction Y, and one first heat exchange part 21 is disposed between the pressure relief member 13 and one electrode terminal 12. The plurality of first heat exchange parts 21 may also be more than two first heat exchange parts 21. At this time, it is preferably that the number of the first heat exchange parts 21 is an even number and symmetrically disposed on both sides of the pressure relief member 13, and the number of the first heat exchange parts 21 on both sides of the pressure relief member 13 is the same. At this time, the corresponding heat exchange effect is more balanced. Among them, the plurality of first heat exchange parts 21 may be arranged in sequence to provide more heat exchange area, so as to achieve a better heat exchange effect.
[0060] It should be noted that the first heat exchange part 21 is arranged between the pressure relief part 13 and the electrode terminal 12 and is connected to the top cover piece 11 for heat exchange. At this time, the first heat exchange part 21 can be attached to the top cover piece 11, so as to achieve better contact heat exchange. When the battery cell 1 has a thermal runaway and causes the pressure relief part 13 to open and release pressure, the first heat exchange part 21 is spaced between the pressure relief part 13 and the electrode terminal 12, which can play a good role in blocking and isolation, and avoid the high-temperature molten material from spraying onto the electrode terminal 12 and causing a short-circuit problem.
[0061] It should also be noted that the temperature equalizing part 24 is located between two adjacent first heat exchange parts 21 and is arranged opposite to the pressure relief part 13, which can prevent the first heat exchange part 21 from blocking the pressure relief part, and can transfer the temperature between the two first heat exchange parts 21 to each other, improving the temperature equalization between two adjacent first heat exchange parts 21. And the temperature equalizing part 24 can be connected to the top cover piece, and only the exhaust hole 241 needs to expose the pressure relief part 13 to realize the normal pressure relief of the pressure relief part 13. At this time, the temperature equalizing part 24 can be further used to contact the top cover piece 11 for cooling, so as to improve the cooling effect on the top cover piece 11.
[0062] In some embodiments, two first heat exchange parts 21 and the temperature equalizing part 24 located on both sides of the pressure relief part 13 enclose a first groove 23. The opening of the first groove 23 faces the top cover piece 11, and the exhaust hole 241 is communicated with the first groove 23; along the third direction Z, the orthographic projection of the pressure relief part 13 on the heat management component 2 is located in the first groove 23.
[0063] In the embodiment of the present application, two adjacent first heat exchange parts 21 and the temperature equalizing part 24 form a first groove 23, and the pressure relief part 13 is arranged opposite to the first groove 23 along the third direction Z. In this way, when the battery cell 1 has a thermal runaway, the pressure relief part 13 opens towards the first groove 23 and sprays the thermal runaway gas and high-temperature molten material into the first groove 23. The temperature equalizing part 24 is provided with an exhaust hole 241, and the gas is discharged to the side of the heat management component 2 away from the battery cell 1 through the exhaust hole 241, effectively reducing the impact on the overall battery pack when the battery cell 1 has a thermal runaway. At the same time, the first groove 23 can collect the thermal runaway gas and guide it along the first direction X, avoiding the thermal runaway gas from flowing around in the whole battery pack, thereby further improving the safety of the battery pack.
[0064] In some embodiments, the heat management component 2 further includes a temperature equalizing part 24. The temperature equalizing part 24 is arranged between two adjacent first heat exchange parts 21 along the second direction Y and is respectively connected to the two first heat exchange parts 21; the temperature equalizing part 24 is spaced from the top cover piece 11 along the third direction Z. The temperature equalizing part 24 and the two first heat exchange parts 21 enclose a first groove 23, and the exhaust hole 241 penetrates through the temperature equalizing part 24 along the third direction Z and is communicated with the first groove 23.
[0065] In the embodiments of the present application, two adjacent first heat exchange parts 21 are connected by a temperature equalizing part 24, and the first heat exchange part 21 is connected to the second heat exchange part 22. In this way, rapid heat transfer along the second direction Y of the heat management component 2 can be achieved, the temperature equalization of the heat management component 2 can be improved, and thus a better cooling effect can be achieved.
[0066] It should be noted that by setting the temperature equalizing part 24, while ensuring the temperature equalization and heat exchange effect of the entire heat management component 2, the overall volume of the heat management component 2 can be effectively reduced, which is beneficial to the overall lightweight of the battery pack.
[0067] In addition, it should also be noted that the temperature equalizing part 24 is arranged at intervals with the top cover sheet 11 and encloses a first groove 23 with two adjacent first heat exchange parts 21. At this time, the temperature equalizing part 24 serves as the bottom wall of the first groove 23, and the exhaust hole 241 penetrates through the temperature equalizing part 24 and communicates with the first groove 23, which is equivalent to the exhaust hole 241 being arranged on the bottom wall of the first groove 23. When the battery cell 1 undergoes thermal runaway, the thermal runaway gas and high-temperature molten matter are ejected outward under the action of high temperature. Among them, due to the large inertia of the high-temperature molten matter, it will directly eject towards the exhaust hole 241 and directly reach the side of the heat management component 2 away from the battery cell 1. In this way, short circuit of the battery cell 1 caused by the high-temperature molten matter can be avoided. The high-temperature gas is relatively dispersed, part of which is discharged through the exhaust hole 241, and part will converge in the first groove 23 and flow along the first groove 23 to both sides. The gas is converged through the first groove 23 to avoid a large-range impact on the inner cavity of the battery pack.
[0068] In some embodiments, the first heat exchange part 21 has a first heat exchange cavity 211, the second heat exchange part 22 has a second heat exchange cavity 221, and the first heat exchange cavity 211 communicates with the second heat exchange cavity 221.
[0069] By setting the first heat exchange cavity 211 and the second heat exchange cavity 221 and making them communicate with each other, the heat exchange medium can circulate in the first heat exchange cavity 211 and the second heat exchange cavity 221, realizing effective overheating of the top of the battery cell by the heat management component 2. At the same time, only one liquid inlet and one liquid outlet are required, making the overall structure of the heat management component 2 simpler and more lightweight.
[0070] In some embodiments, the thermal management component 2 is provided with: a first plate body 25, a first convex portion 26, a second groove 27, a second plate body 28, a second convex portion 29, and a third groove 20; the first plate body 25 is arranged on one side of the battery cell 1 along the third direction Z, and the first plate body 25 is connected to the electrode terminal 12; the first convex portion 26 is arranged on the side of the first plate body 25 facing the battery cell 1 along the third direction Z, the first convex portion 26 is connected to the first plate body 25, and the side of the first convex portion 26 facing away from the first plate body 25 is connected to the top cover sheet 11; the second groove 27 penetrates through the first plate body 25 along the third direction Z and is recessed into the first convex portion 26; the second plate body 28 is arranged on the side of the first plate body 25 away from the battery cell 1 along the third direction Z; the second convex portion 29 is arranged on the side of the second plate body 28 away from the first plate body 25 along the third direction Z, the second convex portion 29 is connected to the second plate body 28, and the orthographic projection of the second convex portion 29 on the battery cell 1 along the third direction Z is at least partially located on the electrode terminal 12; the third groove 20 penetrates through the second plate body 28 along the third direction Z and is recessed into the second convex portion 29; wherein, the first plate body 25 is connected to the second plate body 28, the first plate body 25 seals the third groove 20 to form a second heat exchange cavity 221, and the second plate body 28 seals the second groove 27 to form a first heat exchange cavity 211; the exhaust hole 241 penetrates through the first plate body 25 and the second plate body 28 along the third direction Z.
[0071] In the embodiments of the present application, through the cooperation of the first plate body 25, the first convex portion 26, the second groove 27, the second plate body 28, the second convex portion 29, and the third groove 20, the thermal management component 2 is directly formed. The overall structure is simple, the molding is convenient, and it is convenient for production. Among them, the first convex portion 26, the first plate body 25, and the second plate body 28 are connected to form a first heat exchange portion 21, and the second convex portion 29, the second plate body 28, and the first plate body 25 are connected to form a second heat exchange portion 22. Wherein, the second plate body 28 seals the second groove 27 to form a first heat exchange cavity 211, and the first plate body 25 seals the third groove 20 to form a second heat exchange cavity 221. This kind of structure is convenient for the molding of the heat exchange cavity, and at the same time, the temperature can be transferred between each heat exchange portion through the first plate body 25 and the second plate body 28, so as to realize better temperature uniformity of the thermal management component 2.
[0072] It can be understood that in the embodiment of the present application, on the side of the first plate body 25 facing the battery cell 1, a first convex portion 26 is connected, and heat exchange is carried out by contacting and connecting the first convex portion 26 with the top cover sheet 11. Among them, the second groove 27 penetrates through the first plate body 25 and depresses into the first convex portion 26. At this time, when the second plate body 28 is connected to the first plate body 25, it can cover and seal the second groove 27 along the third direction Z, thus forming a first heat exchange cavity 211. The first heat exchange cavity 211 is used to accommodate a heat exchange medium, and heat is exchanged with the top cover sheet 11 through the first convex portion 26. On the side of the second plate body 28 facing away from the battery cell 1, an enemy convex portion is connected. The third groove 20 penetrates through the second plate body 28 and depresses into the second convex portion 29. At this time, when the first plate body 25 is connected to the second plate body 28, it can cover and seal the third groove 20 along the third direction Z, thus forming a second heat exchange cavity 221. The second heat exchange cavity 221 is used to accommodate a heat exchange medium. At this time, the part of the first plate body 25 that covers and seals the third groove 20 forms a part of the second heat exchange portion 22. The first plate body 25 is connected to the electrode terminal 12 and exchanges the heat of the heat exchange medium in the second heat exchange cavity 221 with the heat of the electrode terminal 12 to achieve the cooling of the electrode terminal 12.
[0073] In the embodiment of the present application, both the first plate body 25 and the second plate body 28 are flat plates and are both located on the side of the electrode terminal 12 facing away from the top cover sheet 11. At this time, it is equivalent to that the first plate body 25 and the second plate body 28 form a support frame. The first convex portion 26 protrudes towards the top cover sheet 11, and the second convex portion 29 protrudes towards the side away from the top cover sheet 11, mainly for providing a receiving cavity to accommodate the heat exchange medium.
[0074] It can be understood that the heat management component 2 can be directly stamped and integrally formed by two plate bodies. At this time, directly connecting the two stamped plate bodies can form the heat management component 2. This kind of structure is simple and easy to form. At the same time, the integral structure is more conducive to heat transfer and also more conducive to production and processing.
[0075] It should also be noted that the part of the first plate body 25 between two adjacent first convex portions 26 is connected to the second plate body 28 to form a temperature equalizing portion 24. At this time, the temperatures of the adjacent first convex portions 26 can be mutually exchanged to achieve the temperature balance of the first heat exchange portion 21.
[0076] In some embodiments, the battery pack has a first direction X that intersects with the third direction Z and the second direction Y. The battery pack includes a plurality of battery cells 1 and a plurality of connecting members 3. The connecting members 3 are arranged along the third direction Z on one side of the battery cells 1 facing the thermal management component 2. The plurality of battery cells 1 are arranged along the first direction X. Each connecting member 3 connects the electrode terminals 12 of two adjacent battery cells 1 along the first direction X. The first heat exchange portion 21 extends along the first direction X, and the first heat exchange portion 21 is respectively connected to the top cover sheets 11 of the plurality of battery cells 1. The second heat exchange portion 22 extends along the first direction X, and the second heat exchange portion 22 is respectively connected to the electrode terminals 12 of the plurality of battery cells 1. The thermal management component 2 has a plurality of exhaust holes 241, and the plurality of exhaust holes 241 are arranged at intervals along the first direction X. Each exhaust hole 241 is arranged opposite to a pressure relief member 13 along the third direction Z.
[0077] In the embodiments of the present application, the battery pack includes a plurality of battery cells 1, and the plurality of battery cells 1 are connected in pairs through a plurality of connecting members 3. The thermal management component 2 is connected to the plurality of battery cells 1 to achieve simultaneous heat exchange of the plurality of battery cells 1. Moreover, the plurality of exhaust holes 241 correspond one-to-one to the pressure relief members 13 of the plurality of battery cells 1. In this way, when any one of the battery cells 1 undergoes thermal runaway, the thermal runaway gas and high-temperature molten matter can be discharged in time, thereby ensuring the safety of the adjacent battery cells 1.
[0078] It should be noted that, in the embodiments of the present application, the connecting member 3 is welded to the electrode terminal 12. At this time, the first heat exchange portion 21 is connected to the top cover sheet 11 for heat exchange, and the second heat exchange portion 22 is connected to the connecting sheet. The connecting sheet is connected to the electrode terminal 12, so that the second heat exchange portion 22 is connected to the electrode terminal 12 through the connecting sheet for heat exchange.
[0079] In some embodiments, the plurality of battery cells 1 are arranged along the first direction X to form a battery pack 100. The battery pack includes a plurality of battery packs 100 and a plurality of thermal management components 2. The plurality of battery packs 100 are arranged along the second direction Y, and the plurality of thermal management components 2 are arranged and connected along the second direction Y. Each thermal management component 2 is connected to a battery pack 100.
[0080] In the embodiment of the present application, there are multiple battery packs 100 arranged side by side in the box of the battery pack, and multiple thermal management components 2 are respectively connected to the corresponding battery packs 100 to exchange heat and cool down the battery packs 100. Among them, the multiple thermal management components 2 are connected. At this time, the multiple thermal management components 2 can be directly welded and connected. When the thermal management component 2 is formed by the first plate body 25, the first convex portion 26, the second groove 27, the second plate body 28, the second convex portion 29 and the third groove 20, it can also be that the multiple first plate bodies 25 are integrally connected, the multiple second plate bodies 28 are integrally connected, and the first plate body 25 and the second plate body 28 are connected along the third direction Z. At this time, multiple thermal management components 2 can be directly formed. At the same time, the first heat exchange cavity 211 of the first heat exchange portion 21 and the second heat exchange cavity 221 of the second heat exchange portion 22 of the multiple thermal management components 2 are communicated, which is convenient for the heat exchange medium to be injected from one inlet and led out from the same liquid outlet, further streamlining the structure and facilitating assembly.
[0081] Correspondingly, an electric device described in the embodiment of the present application includes the battery pack as described in any one of the foregoing embodiments, and the battery pack is used to supply power to the electric device.
[0082] It can be understood that the electric device in the embodiment of the present application includes all the technical features and technical effects of the foregoing battery pack, which will not be elaborated herein.
[0083] Of course, the electric device referred to in the present application can be application devices such as vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and power tools. The vehicle can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc.; the electric toys include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; the power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers, etc. The embodiment of the present application does not make special restrictions on the above-mentioned electric devices.
[0084] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0085] The above has introduced in detail a battery pack and an electrical device provided by the embodiments of the present application, and specific examples have been used to illustrate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A battery pack, characterized in that: Having intersecting third direction (Z) and second direction (Y), including: A battery cell (1), comprising a top cover sheet (11), a pressure relief piece (13) and an electrode terminal (12), wherein the top cover sheet (11) is provided with a pressure relief hole (111), the pressure relief piece (13) is connected to the top cover sheet (11) and covers the pressure relief hole (111), and the electrode terminal (12) is spaced apart from the pressure relief piece (13) along the second direction (Y) and is connected to the top cover sheet (11); The heat management component (2) comprises a temperature-averaging portion (24), a first heat exchange portion (21) and a second heat exchange portion (22) arranged along the second direction (Y), wherein the first heat exchange portion (21) and the second heat exchange portion (22) are connected, and the temperature-averaging portion (24) is connected to a side of the first heat exchange portion (21) away from the second heat exchange portion (22); along the third direction (Z), the electrode terminal (12) is protrudingly arranged on a side of the top cover sheet (11) facing the heat management component (2), and the first heat exchange portion (21) is connected to the first heat exchange portion (21). ) is connected to the top cover sheet (11), the second heat exchange portion (22) is connected to the electrode terminal (12), and the second heat exchange portion (22) is spaced apart from the top cover sheet (11) along a third direction (Z); the temperature-averaging portion (24) has an exhaust hole (241), and the exhaust hole (241) passes through the temperature-averaging portion (24) along the third direction (Z); along the third direction (Z), the orthographic projection of the pressure relief member (13) on the thermal management component (2) is at least partially located in the exhaust hole (241).
2. The battery pack according to claim 1, characterized in that: The battery cell (1) comprises two electrode terminals (12) arranged at intervals along the second direction (Y), the first heat exchange portion (21) is arranged between the two electrode terminals (12) along the second direction (Y), the pressure relief member (13) is arranged between the two electrode terminals (12) along the second direction (Y), and the pressure relief member (13) is arranged at intervals from each electrode terminal (12); The heat management component (2) comprises a plurality of second heat exchange parts (22), wherein the plurality of second heat exchange parts (22) are arranged at intervals along the second direction (Y), the first heat exchange part (21) and the temperature equalizing part (24) are arranged between two adjacent second heat exchange parts (22) along the second direction (Y), and each of the electrode terminals (12) is connected to at least one of the second heat exchange parts (22).
3. The battery pack according to claim 2, characterized in that: Along the third direction (Z), the pressure relief component (13) and the temperature equalizing portion (24) are arranged at intervals; and the first heat exchange portion (21) is arranged between the pressure relief component (13) and the electrode terminal (12) along the second direction (Y).
4. The battery pack according to claim 3, characterized in that: The thermal management component (2) comprises a plurality of the first heat exchange parts (21), wherein the plurality of the first heat exchange parts (21) are connected and arranged between two second heat exchange parts (22) adjacent to each other along the second direction (Y); at least one first heat exchange part (21) is arranged between each of the electrode terminals (12) and the pressure relief part (13), and the pressure relief part (13) is arranged between two adjacent first heat exchange parts (21); and the temperature equalizing part (24) is respectively connected to the two first heat exchange parts (21) located on both sides of the pressure relief part (13).
5. The battery pack according to claim 4, characterized in that: The two first heat exchange parts (21) and the temperature equalizing part (24) located on both sides of the pressure relief part (13) form a first groove (23); the opening of the first groove (23) faces the top cover sheet (11); the exhaust hole (241) is connected to the first groove (23); along the third direction (Z), the orthographic projection of the pressure relief part (13) on the thermal management component (2) is located in the first groove (23).
6. The battery pack according to claim 1, characterized in that: The first heat exchange portion (21) has a first heat exchange cavity (211); The second heat exchange portion (22) has a second heat exchange cavity (221), and the first heat exchange cavity (211) is in communication with the second heat exchange cavity (221).
7. The battery pack according to claim 6, characterized in that: The thermal management component (2) is provided with: A first plate (25) is arranged on one side of the battery cell (1) along the third direction (Z), and the first plate (25) is connected to the electrode terminal (12); A first convex portion (26) is arranged along the third direction (Z) on a side of the first plate (25) facing the battery cell (1), the first convex portion (26) is connected to the first plate (25), and a side of the first convex portion (26) facing away from the first plate (25) is connected to the top cover sheet (11); a second groove (27) penetrating the first plate (25) along the third direction (Z) and recessed into the first convex portion (26); A second plate (28) is arranged along the third direction (Z) on a side of the first plate (25) away from the battery cell (1); a second convex portion (29) disposed along the third direction (Z) on a side of the second plate body (28) away from the first plate body (25), the second convex portion (29) being connected to the second plate body (28), and an orthographic projection of the second convex portion (29) along the third direction (Z) on the battery cell (1) being at least partially located on the electrode terminal (12); a third groove (20) penetrating the second plate body (28) along the third direction (Z) and recessed into the second convex portion (29); The first plate body (25) is connected to the second plate body (28); the first plate body (25) covers the third groove (20) to form the second heat exchange chamber (221); the second plate body (28) covers the second groove (27) to form the first heat exchange chamber (211); and the exhaust hole (241) passes through the first plate body (25) and the second plate body (28) along the third direction (Z).
8. The battery pack according to any one of claims 1 to 7, characterized in that: The battery pack has a first direction (X) intersecting the third direction (Z) and the second direction (Y), the battery pack comprises a plurality of battery cells (1) and a plurality of connectors (3), the connectors (3) being arranged along the third direction (Z) on a side of the battery cells (1) facing the thermal management component (2), the plurality of battery cells (1) being arranged along the first direction (X), and each of the connectors (3) connecting the electrode terminals (12) of two adjacent battery cells (1) along the first direction (X); The first heat exchange portion (21) extends along the first direction (X), and the first heat exchange portion (21) is respectively connected to the top cover sheets (11) of the plurality of battery cells (1); the second heat exchange portion (22) extends along the first direction (X), and the second heat exchange portion (22) is respectively connected to the electrode terminals (12) of the plurality of battery cells (1); the thermal management component (2) has a plurality of exhaust holes (241), the plurality of exhaust holes (241) penetrate the temperature equalizing portion (24) along the third direction (Z), and the plurality of exhaust holes (241) are arranged at intervals along the first direction (X), and each exhaust hole (241) is arranged opposite to a pressure relief member (13) along the third direction (Z).
9. The battery pack according to claim 8, characterized in that: A plurality of battery cells (1) are arranged along the first direction (X) to form a battery pack (100), wherein the battery pack comprises: a plurality of the battery packs (100), wherein the plurality of the battery packs (100) are arranged along the second direction (Y); A plurality of the thermal management components (2) are arranged and connected along the second direction (Y), and each of the thermal management components (2) is connected to one of the battery packs (100).
10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1-9.