Battery pack and vehicle

Abstract

The battery pack comprises a connecting piece, a cooling piece and a heat conduction piece, the connecting piece is provided with a first end part and a second end part, the first end part is connected to an output electrode of a battery monomer, the second end part is used for being electrically connected with a power distribution unit, the cooling piece is used for cooling the battery monomer, and the heat conduction piece is used for conducting heat conduction on the battery monomer. The heat conduction piece is arranged between the connecting piece and the cooling piece and used for conducting heat of the connecting piece to the cooling piece. The connecting piece of the battery pack is good in heat dissipation and cooling performance, the situation that the temperature of the connecting piece is too high due to large overcurrent and the like in the using process is avoided, and the using safety is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular, to a battery pack and a vehicle. Background Art

[0002] In recent years, the new energy vehicle industry has developed rapidly. As the power source of new energy vehicles, the market has also put forward higher requirements for the charging time and discharge power of power batteries. In order to achieve the needs of fast charging and high-power discharge of power batteries, the current passing through the connection bar of the high-voltage circuit of the power battery is getting larger and larger, which makes the connection bar overheated during use, which is not conducive to the safety of power battery use. Utility Model Content

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, an embodiment of the present disclosure provides a battery pack whose connector has good heat dissipation and cooling properties, thereby preventing the connector from being overheated due to reasons such as large overcurrent during use.

[0005] The disclosed embodiment also provides a vehicle including the above-mentioned battery pack.

[0006] The battery pack of the present disclosure comprises:

[0007] A connector, the connector having a first end and a second end, the first end being connected to the output pole of the battery cell, and the second end being used for being electrically connected to the power distribution unit;

[0008] A cooling member, the cooling member is used to cool the battery cell;

[0009] The heat conducting member is arranged between the connecting member and the cooling member and is used for conducting the heat of the connecting member to the cooling member.

[0010] The connector of the battery pack disclosed in the present invention has good heat dissipation and cooling properties, thereby preventing the connector from being overheated due to reasons such as large overcurrent during use.

[0011] In some embodiments, the connecting member includes a middle portion connected between the first end portion and the second end portion, and the heat conducting member is disposed at an end of the middle portion close to the first end portion.

[0012] In some embodiments, at least a portion of the middle portion is bent and bulges downward.

[0013] In some embodiments, the cooling component includes a cold plate, the middle portion includes a downwardly bent vertical section, the vertical section close to the first end is arranged opposite to the cold plate, and the heat conductive component includes a first heat conductive sub-component, which is arranged on the side of the vertical section facing the cold plate.

[0014] In some embodiments, the cooling member is disposed between two of the battery cells, and the cold plate protrudes relative to the battery cells toward the connecting member.

[0015] In some embodiments, a groove is provided on a side of the first heat conductive sub-component facing the cold plate, and the cooling component is accommodated in the groove.

[0016] In some embodiments, the cooling member includes a tray, the connecting member includes a middle portion, the middle portion is connected between the first end and the second end, the middle portion includes a horizontal segment and two vertical segments formed by bending, the horizontal segment is connected between the two vertical segments, and the horizontal segment abuts against the tray.

[0017] In some embodiments, the heat conducting member includes a second heat conducting member disposed between the horizontal section and the tray.

[0018] In some embodiments, the connecting component includes two sub-components, and the two sub-components are overlapped and connected above the second heat-conducting sub-component.

[0019] In some embodiments, the projection of the overlapping portion of the two sub-components in the up-down direction is located within the range of the projection of the second heat-conducting sub-component in the up-down direction.

[0020] The vehicle of the present disclosure includes a battery pack as described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a partial structural schematic diagram of a battery pack according to an embodiment of the present disclosure.

[0022] Figure 2 It is a schematic diagram of the arrangement of the connecting parts and the heat conducting parts of the embodiment of the present disclosure.

[0023] Figure 3 yes Figure 2 Schematic diagram of the layout of the middle connector, battery cells, heat conductors, and cooling components.

[0024] Reference numerals:

[0025] Connecting member 10; first end 11; second end 12; first section 13; second section 14; third section 15; fourth section 16; fifth section 17; sub-member 18;

[0026] Battery cell 20;

[0027] Cooling member 30; Cold plate 31; Tray 32;

[0028] Heat conducting component 40 ; first heat conducting component 41 ; groove 411 ; second heat conducting component 42 . DETAILED DESCRIPTION

[0029] Embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, but should not be understood as limiting the present disclosure.

[0030] like Figure 1 As shown, the battery pack of the present disclosure includes a connecting member 10, a cooling member 30 and a heat conducting member 40.

[0031] The connector 10 has a first end 11 and a second end 12. The first end 11 is connected to the output pole of the battery cell, and the second end 12 is used to be electrically connected to a power distribution unit (a device responsible for distributing the power output of the power supply to various loads). Figure 2 As shown, the first end 11 may be the rear end of the connector 10, and the second end 12 may be the right end of the connector 10. Due to factors such as the structure of the connector 10, the size of each position, and the distance from the battery cell 20, the heating conditions and temperatures at different positions of the connector 10 may be different, so the connector 10 has a heating point, which can be regarded as a part of the connector 10 that generates more heat and has a higher temperature when current is passed through it.

[0032] The cooling element 30 is used to cool the battery cell 20. The cooling element 30 can be regarded as a component of the battery pack with good heat dissipation performance, which is used to take away the heat of the battery cell to achieve the purpose of cooling the battery cell 20. For example, Figure 3 As shown, the cooling member 30 may be a cold plate 31 , a battery pack tray 32 or other components.

[0033] It should be noted that if Figure 1 As shown, the battery pack may include battery cells 20, and multiple battery cells 20 are arranged in a matrix. In the left-right direction, a cold plate 31 may be provided between two adjacent columns of battery cells 20. And in the up-down direction, multiple battery cells 20 may be installed above the tray 32. It is understood that the cold plate 31 may be provided with a cavity inside to pass a cooling medium to achieve the purpose of quickly cooling the battery cells 20. The cold plate 31 may also not be provided with a cavity but contact with other refrigerants to quickly take away the heat of the battery cells 20.

[0034] The heat conducting member 40 is disposed between the connecting member 10 and the cooling member 30 and is used to conduct heat from the connecting member 10 to the cooling member 30. For example, the heat conducting member 40 may be disposed at a hot spot of the connecting member 10, and the heat conducting member 40 is connected to the cooling member 30 of the battery pack so that the heat from the hot spot can be quickly dissipated to the cooling member 30 via the heat conducting member 40.

[0035] For example, Figure 2 As shown, the heat conductor 40 can be a block structure, and the inner surface of the heat conductor 40 facing the connector 10 can be fixed to the heat point of the connector 10 by bonding with a thermally conductive adhesive or the like, and the outer surface of the heat conductor 40 can be stopped or connected and fixed to the cooling member 30 of the battery pack.

[0036] When in use, the connector 10 will generate heat due to the effect of the current passing through it. Since the heat conductor 40 has good thermal conductivity, the heat conductor 40 can quickly transfer the heat at the hot point of the connector 10 to the cooling element 30, thereby achieving rapid dissipation of heat and avoiding the situation where the temperature is too high due to heat accumulation on the connector 10.

[0037] The connector 10 of the battery pack of the disclosed embodiment has good heat dissipation and cooling properties, which avoids the situation where the temperature of the connector 10 is too high due to large overcurrent during use, improves the current carrying capacity of the connector 10, and also improves the problem of aging of the insulation layer caused by excessive temperature.

[0038] Secondly, compared with the prior art which increases the cross-sectional size of the connector 10 to improve the current flow capacity to avoid excessive temperature, this avoids the situation where the connector 10 is larger in size and easily increases the space occupied by the battery pack, which is beneficial to realizing the integration of the battery pack and also beneficial to reducing the overall cost.

[0039] In some embodiments, the connector 10 includes a middle portion connected between the first end 11 and the second end 12 , and the heat conducting member 40 is disposed at one end of the middle portion close to the first end 11 .

[0040] For example, Figure 2 As shown, the connecting member 10 may include a first section 13, a second section 14, a third section 15, a fourth section 16 and a fifth section 17 that are bent, the first section 13 and the fifth section 17 are located in the same plane, the third section 15 is parallel to the first section 13 and the fifth section 17 and arranged at intervals, and the third section 15 forms a supporting section, the second section 14 is connected between the first section 13 and the third section 15, and the fourth section 16 is connected between the third section 15 and the fifth section 17.

[0041] The first section 13 and the fifth section 17 are generally located in the same horizontal plane, wherein the first section 13 can extend in the left-right direction, and the fifth section 17 can extend in the front-back direction. The third section 15 can be located below the first section 13 and the fifth section 17 and can be arranged in parallel with the first section 13 and the fifth section 17, and the third section 15 can extend in the left-right direction.

[0042] The second section 14 and the fourth section 16 can both extend in the up-down direction, wherein the top end of the second section 14 can be connected to the left end of the first section 13, and the bottom end of the second section 14 can be connected to the right end of the third section 15. The top end of the fourth section 16 can be connected to the front end of the fifth section 17, and the bottom end of the fourth section 16 can be connected to the left end of the third section 15.

[0043] The middle portion can be regarded as a portion formed by the second section 14, the third section 15, and the fourth section 16, that is, the middle portion of the connector 10 can be a sunken structure. Figure 2 As shown, since the first end 11 needs to be connected to the battery cell 20, the first area adjacent to the first end 11 will generate a large amount of heat and will also form a hot spot, which can be regarded as the first hot spot. The fourth section 16 of the middle part should be adjacent to the first end 11. When arranging the heat conductor 40, the heat conductor 40 can be arranged in the fourth section 16. Arranging the heat conductor 40 at the hot spot can fully improve the heat dissipation and cooling effect of the connector 10 adjacent to the first end 11, avoid the situation where the local temperature of the connector 10 is too high, and make the arrangement of the heat conductor 40 more targeted.

[0044] In some embodiments, at least part of the middle portion is bent and bulges downward. Figure 2 As shown, the middle portion formed by the second section 14, the third section 15, and the fourth section 16 can protrude downward. During assembly, the middle portion can be attached to the tray 32, and the heat conductive member 40 can be clamped and fixed between the third section 15 of the middle portion and the tray 32. The setting of the middle portion can make up for the elevation difference between the top of the battery cell 20 and the tray 32, thereby facilitating the connection arrangement of the heat conductive member 40 and the tray 32.

[0045] In some embodiments, the middle portion includes a vertical segment that bends downward, for example Figure 2 As shown, the vertical section is the part extending downward from the middle part, and there are two vertical sections, which correspond to the second section 14 and the fourth section 16 respectively. The vertical section near the first end 11 is arranged opposite to the cooling member 30, for example, Figure 2 and Figure 3 As shown, the vertical section close to the first end 11 is the fourth section 16 , and the fourth section 16 and the cold plate 31 may be arranged opposite to each other in the front-to-back direction.

[0046] like Figure 2 and Figure 3 As shown, the heat conducting component 40 includes a first heat conducting component 41, and the first heat conducting component 41 is arranged on the side of the vertical section facing the cooling component 30, that is, the first heat conducting component 41 is arranged on the rear side of the fourth section 16, so that the first heat conducting component 41 can be closer to the battery cell 20, thereby further improving the heat dissipation and cooling effect of the connecting component 10 adjacent to the battery cell 20, and avoiding the situation where the local temperature of the connecting component 10 is too high.

[0047] In some embodiments, the cooling member 30 includes a cold plate 31, which is disposed between two battery cells 20, and the cold plate 31 protrudes toward the connector 10 relative to the battery cells 20. Figure 3 As shown, two battery cells 20 may protrude from the front side of the cold plate 31 , thereby shortening the distance between the cold plate 31 and the first heat-conducting sub-component 41 , thereby facilitating the subsequent cooperation with the first heat-conducting sub-component 41 .

[0048] In some embodiments, a groove 411 is provided on one side of the first heat conducting component 41 facing the cold plate 31, and the cold plate 31 is accommodated in the groove 411. Figure 2 As shown, the groove 411 can be provided at the rear of the first heat conducting sub-component 41, and the groove 411 can penetrate the first heat conducting sub-component 41 in the up-down direction. Figure 3 As shown, the cold plate 31 may be arranged vertically, and the front edge of the cold plate 31 may be inserted and assembled in the groove 411 .

[0049] Thus, on the one hand, the contact area between the first heat-conducting sub-component 41 and the cold plate 31 can be increased, thereby improving the thermal conductivity between the first heat-conducting sub-component 41 and the cold plate 31, and facilitating the rapid heat dissipation and cooling of the connector 10; on the other hand, the limited assembly between the first heat-conducting sub-component 41 and the cold plate 31 can also be achieved, thereby enhancing the structural compactness and stability of the assembly of the heat-conducting sub-component 40 and the cold plate 31.

[0050] In some embodiments, the cooling member 30 includes a tray 32 , a middle portion of which includes a horizontal segment and two vertical segments formed by bending, the horizontal segment is connected between the two vertical segments, and the horizontal segment abuts against the tray 32 .

[0051] For example, Figure 2 As shown, the horizontal section may be the third section 15, and the two vertical sections may be the second section 14 and the fourth section 16. Figure 3 As shown, when installing the connector 10, the horizontal section can abut against the tray 32, that is, the tray 32 can be fixed on the lower side of the horizontal section, thereby enhancing the structural stability of the assembly on the one hand, and on the other hand, the bent middle portion can also compensate for the elevation difference between the top side of the battery cell 20 and the subsequent tray 32, thereby facilitating the clamping arrangement of the heat conductor 40 between the horizontal section and the tray 32.

[0052] In some embodiments, the heat conducting member 40 includes a second heat conducting member 42, and the second heat conducting member 42 is disposed between the horizontal section and the cooling member 30. Figure 2 and Figure 3 As shown, the second heat-conducting sub-component 42 can be in a flat block shape, and the second heat-conducting sub-component 42 can be fixed to the lower part of the left end of the third section 15 of the above-mentioned middle part, so as to achieve heat conduction between the horizontal section and the tray 32.

[0053] In some embodiments, a flow channel is provided on one side of the tray 32 facing the second heat-conducting sub-component 42 , and the flow channel is used for cooling medium to flow through, so as to further improve the heat dissipation effect of the connector 10 .

[0054] In some embodiments, the connector 10 includes two sub-components 18, and the two sub-components 18 are overlapped and connected above the second heat-conducting component 40. For example, the heat-conducting component 40 includes a second heat-conducting sub-component 42, and the connector 10 is formed by welding at least two sub-components 18, wherein the welding positions of the two sub-components 18 form a heat point, and the second heat-conducting sub-component 42 is arranged at the welding positions of the two sub-components 18.

[0055] Specifically, Figure 2 As shown, the connector 10 can be divided and include two sub-components 18, and the corresponding ends of the two sub-components 18 can be overlapped and welded. The welded overlap of the two sub-components 18 also forms a heating point, which is the second heating point. The second heat-conducting sub-component 42 can be fixed on the lower surface of the second heating point.

[0056] When in use, the heat generated at the welding position of the connector 10 is greater than that of other parts. Placing the second heat-conducting component 42 at the second heating point can achieve rapid heat dissipation of the second heating point and also make the arrangement of the second heat-conducting component 42 more targeted.

[0057] It should be noted that the first section 13 , the second section 14 , and the upper portion of the third section 15 can be integrally formed to form one of the sub-components 18 , and the lower portion of the third section 15 , the fourth section 16 , and the fifth section 17 can be integrally formed to form another of the sub-components 18 .

[0058] In some embodiments, the cooling member 30 includes a tray 32, and the second heat conductive sub-member 42 is clamped between the tray 32 and the welding position of the two sub-members 18. Figure 2 and Figure 3 As shown, the tray 32 can be an aluminum tray 32 of the battery pack, which mainly plays the role of supporting and optimizing the load distribution. The bottom surface of the second heat-conducting sub-component 42 can be abutted or connected with the tray 32, so that the heat conducted through the second heat-conducting sub-component 42 can be quickly dissipated through the tray 32, ensuring the cooling and heat dissipation effect on the second heat-generating point.

[0059] Secondly, the tray 32 can also play a supporting role for the connector assembly 10, thereby enhancing the limiting effect on the connector assembly 10, and further enhancing the stability of the fixation of the connector assembly 10.

[0060] In some embodiments, the projection of the overlapping portion of the two sub-components 18 in the vertical direction is located within the range of the projection of the second heat-conducting sub-component 42 in the vertical direction. Figure 2 As shown, the overlapping parts of the two sub-components 18 can be in the shape of a flat block, and the second heat-conducting sub-component 42 can also be in the shape of a flat block. The projection of the overlapping parts and the projection of the second heat-conducting sub-component 42 can both be square, and the projections of the overlapping parts are all located within the projection range of the second heat-conducting sub-component 42. Therefore, on the one hand, it can provide a better supporting effect on the overlapping parts, and on the other hand, it can fully guarantee the supporting and heat conduction effects of the overlapping parts.

[0061] In some embodiments, the material of the connector 10 may be copper, aluminum, copper-aluminum welding products, etc., thereby ensuring good electrical conductivity of the connector 10 .

[0062] In some embodiments, the cooling member 30 includes at least one of the following: a cold plate 31 and a tray 32. For example, there may be only one heat conductive member 40 on the connector 10, and the heat conductive member 40 may abut or be connected to one of the cold plate 31 and the tray 32 of the battery pack, so that the heat conducted by the heat conductive member 40 can be quickly dissipated through the cold plate 31 and the tray 32. In some other embodiments, the heat conductive member 40 may also be connected to the cold plate 31, the tray 32, etc. at the same time.

[0063] In some embodiments, the connecting member 10 has multiple heat-generating points, and multiple heat-conducting members 40 are provided. The multiple heat-conducting members 40 are arranged at the multiple heat-generating points in a one-to-one correspondence, and the multiple heat-conducting members 40 are connected to different cooling members 30 .

[0064] For example, there may be two main heat points on the connector 10, and in this case, only two heat conducting members 40 may be arranged, and the two heat conducting members 40 may be fixed at the two heat points respectively. In other embodiments, there may be three, four, five, etc. heat points on the connector 10, and in this case, three, four, five, etc. heat conducting members 40 may be arranged accordingly. Thus, the heat dissipation and cooling effect of each heat point on the connector 10 is fully guaranteed.

[0065] In some embodiments, the battery pack of the disclosed embodiment may further include a battery box, etc., and the tray 32, the battery cell 20, and the cold plate 31 may all be assembled in the battery box. There are multiple battery cells 20 and cold plates 31, and multiple battery cells 20 may be arranged at intervals in the left and right directions, and multiple cold plates 31 may be matched one by one between two adjacent battery cells 20. The front end of one of the cold plates 31 may extend beyond the battery cell 20 and may be plugged and assembled in the slot of the first heat conductive sub-component 41.

[0066] The tray 32 can be located below the multiple battery cells 20 and the multiple cold plates 31 to play a supporting role. The second heat conductive sub-component 42 on the connector assembly 10 can be attached and fixed to the upper surface of the tray 32 to achieve heat conduction to the tray 32.

[0067] The following describes a vehicle according to an embodiment of the present disclosure.

[0068] The vehicle of the disclosed embodiment includes a battery pack, which may be the battery pack described in any of the above embodiments. The vehicle may be a new energy vehicle, specifically a sedan, SUV, bus or other vehicle, and of course may also be other vehicles that require the use of a battery pack.

[0069] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present disclosure.

Claims

1. A battery pack, characterized in that: include: A connector, the connector having a first end and a second end, the first end being connected to the output pole of the battery cell, and the second end being used for being electrically connected to the power distribution unit; A cooling member, the cooling member is used to cool the battery cell; The heat conducting member is arranged between the connecting member and the cooling member and is used for conducting the heat of the connecting member to the cooling member.

2. The battery pack according to claim 1, characterized in that: The connecting member includes a middle portion connected between the first end portion and the second end portion, and the heat conducting member is disposed at one end of the middle portion close to the first end portion.

3. The battery pack according to claim 2, characterized in that: At least a portion of the middle portion is bent and bulges downward.

4. The battery pack according to claim 3, characterized in that: The cooling component includes a cold plate, the middle portion includes a downwardly bent vertical section, the vertical section close to the first end is arranged opposite to the cold plate, and the heat conductive component includes a first heat conductive sub-component, which is arranged on a side of the vertical section facing the cold plate.

5. The battery pack according to claim 4, characterized in that: The cooling member is disposed between two of the battery cells, and the cold plate protrudes relative to the battery cells toward the connecting member.

6. The battery pack according to claim 5, characterized in that: A groove is provided on a side of the first heat-conducting sub-component facing the cold plate, and the cooling component is accommodated in the groove.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The cooling member includes a tray, the connecting member includes a middle part, the middle part is connected between the first end and the second end, the middle part includes a horizontal section and two vertical sections formed by bending, the horizontal section is connected between the two vertical sections, and the horizontal section abuts against the tray.

8. The battery pack according to claim 7, characterized in that: The heat conducting member includes a second heat conducting member, and the second heat conducting member is arranged between the horizontal section and the tray.

9. The battery pack according to claim 8, characterized in that: The connecting component includes two sub-components, and the two sub-components are overlapped and connected above the second heat-conducting sub-component.

10. The battery pack according to claim 9, characterized in that: The projection of the overlapping part of the two sub-components in the up-down direction is located within the range of the projection of the second heat-conducting sub-component in the up-down direction.

11. A vehicle, characterized in that: A battery pack comprising any one of claims 1 to 9.

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