Battery pack

Abstract

The utility model discloses a battery pack which comprises a box body, a battery pack is arranged in the box body, the battery pack comprises a plurality of single batteries arranged along a first direction, each single battery is provided with a first surface, an exposed area is arranged on each first surface, an upper heat exchange plate is arranged at the upper part of each exposed area, and a lower heat exchange plate is arranged at the lower part of each exposed area. The upper heat exchange plate is in contact with the metal surface of the battery monomer through the exposed area, and the upper heat exchange plate extends along a first direction. According to the battery pack disclosed by the utility model, the heat exchange efficiency of the cold plate is improved, the temperature control and regulation effect on the battery pack is better, the safety performance of the battery is improved, and the service life of the battery is prolonged.

Description

Technical Field

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

[0002] A battery pack is a device containing batteries, typically composed of multiple individual battery cells. Battery packs provide a sustainable, reusable power supply, enabling modern life and industrial production to continue uninterrupted.

[0003] As the energy density of power batteries increases, the demand for heat dissipation also grows. Current technologies typically employ cold plate structures for liquid cooling. To improve heat dissipation efficiency, cold plate structures are generally placed at the top or bottom of the battery pack to cool individual battery cells. However, the heat exchange efficiency of the cold plates within the battery pack in existing technologies is relatively low, resulting in poor temperature control of the battery pack and impacting battery safety and lifespan. Utility Model Content

[0004] In view of this, the present invention provides a battery pack that improves the heat exchange efficiency of the cold plate, provides better temperature control and regulation of the battery pack, improves battery safety performance, and extends battery life.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A battery pack includes a housing, in which a battery pack is disposed. The battery pack includes a plurality of battery cells arranged along a first direction. Each battery cell has a first surface with an exposed area. An upper heat exchange plate is disposed on the upper part of the exposed area. The upper heat exchange plate contacts the metal surface of the battery cell through the exposed area and extends along the first direction.

[0007] As can be seen from the above technical solution, the battery pack provided by this utility model includes a battery casing and a cover plate for each battery cell. The cover plate is connected to the top opening of the battery casing, and an insulating plate for insulation is provided on the cover plate. The first surface is the surface where the insulating plate is installed. The cover plate of the battery cell is made of metal, that is, the upper surface of the cover plate is a metal surface. An exposed area is provided on the insulating plate, and an upper heat exchange plate is provided on the upper part of the exposed area. The upper heat exchange plate contacts the upper surface of the cover plate through the exposed area. The upper heat exchange plate extends along a first direction, which is the arrangement direction of the battery cells. By setting exposed areas on the insulating plates of the battery cells, a portion of the cover plate directly contacts the upper heat exchange plate. Since the cover plate is made of metal, which has high thermal conductivity, the heat transferred to the upper heat exchange plate does not pass through the insulating plate. The upper heat exchange plate directly contacts the exposed areas on the cover plate, allowing the heat from the battery cells to be quickly conducted to the upper heat exchange plate through the exposed metal surface, thus cooling the battery cells. This significantly improves the heat exchange efficiency of the cooling plate, resulting in better temperature control of the battery pack, enhanced battery safety, and extended battery life. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 A schematic diagram of the upper and lower heat exchange plates installed on the housing at one angle, according to an embodiment of the present utility model;

[0010] Figure 2 A schematic diagram of the upper and lower heat exchange plates installed on the housing from another angle, according to an embodiment of the present utility model.

[0011] Figure 3 This is a schematic diagram of the battery pack provided in an embodiment of the present utility model;

[0012] Figure 4 A schematic diagram of the upper surface structure of a battery cell provided in an embodiment of the present invention;

[0013] Figure 5 A schematic diagram of the upper heat exchange plate at one angle provided in an embodiment of this utility model;

[0014] Figure 6 for Figure 5 A partially enlarged structural diagram of part A in the diagram;

[0015] Figure 7 A structural schematic diagram of the upper heat exchange plate from another angle provided in an embodiment of this utility model;

[0016] Figure 8 for Figure 7 A cross-sectional view of the BB position in the diagram;

[0017] Figure 9 A schematic diagram of the upper surface structure of a battery cell provided in another embodiment of the present invention;

[0018] Figure 10 for Figure 9 A schematic diagram of the structure of the heat exchange plate after the battery cells are grouped together.

[0019] Figure 11 A schematic diagram of the arrangement structure of a battery cell and an upper heat exchange plate provided in another embodiment of this utility model;

[0020] Figure 12 This is a schematic diagram showing the structure of the upper heat exchange plate of this utility model, with one side flush with one side of the exposed area.

[0021] Figure 13 This is a schematic diagram of the structure of the upper heat exchange plate of this utility model, with two sides located on the outer side of the exposed area;

[0022] Figure 14 A schematic diagram showing the structure of the upper heat exchange plate of this utility model with its two sides flush with the two sides of the exposed area;

[0023] Figure 15 This is a schematic diagram of the arrangement of the liquid inlet heat exchanger tube and the liquid outlet heat exchanger tube of the upper heat exchanger plate of this utility model.

[0024] Figure 16 This is a schematic diagram of the structure of the lower heat exchange plate of this utility model;

[0025] Figure 17 for Figure 16 A cross-sectional view of the CC position in the diagram;

[0026] Figure 18 This is a schematic diagram of the structure of the connecting plate of this utility model when it limits the upper heat exchange plate;

[0027] Figure 19 This is a schematic diagram of the connecting plate of this utility model.

[0028] in:

[0029] 1. Box body,

[0030] 101. Front beam, 102. Rear beam, 103. Middle beam, 104. Side beam.

[0031] 2. Install the heat exchange plate.

[0032] 201. First coolant delivery chamber; 202. Inlet heat exchanger pipe; 203. Outlet heat exchanger pipe.

[0033] 3. Lower heat exchange plate,

[0034] 301, clearance hole; 302, second coolant delivery chamber.

[0035] 4. Second manifold,

[0036] 5. First manifold,

[0037] 6. Main liquid inlet,

[0038] 7. Main outlet,

[0039] 8. Battery cells,

[0040] 801. Exposed area; 802. Output terminal; 803. Insulation board.

[0041] 9. First connecting layer,

[0042] 10. Second connecting layer,

[0043] 11. Connecting plate,

[0044] 1101. Connecting through hole. Detailed Implementation

[0045] This utility model discloses a battery pack that improves the heat exchange efficiency of the cold plate, provides better temperature control for the battery pack, enhances battery safety performance, and extends battery life.

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0047] See Figures 1 to 8The battery pack of this utility model includes a housing 1, within which a battery pack is disposed. The battery pack includes multiple battery cells 8 arranged along a first direction. Each battery cell 8 has a first surface with an exposed area 801. An upper heat exchange plate 2 is disposed above the exposed area 801, and the upper heat exchange plate 2 contacts the metal surface of the battery cell 8 through the exposed area 801. The upper heat exchange plate 2 extends along the first direction. Each battery cell 8 includes a battery casing and a cover plate. The cover plate is connected to the top opening of the battery casing, and an insulating plate 803 is disposed on the cover plate for insulation. The first surface is the surface of the insulating plate 803. The cover plate of the battery cell 8 is made of metal, that is, the upper surface of the cover plate is a metal surface. The exposed area 801 is disposed on the insulating plate 803, and the upper heat exchange plate 2 is disposed above the exposed area 801. The upper heat exchange plate 2 contacts the upper surface of the cover plate through the exposed area 801, and the upper heat exchange plate 2 extends along the first direction. Figure 3 The direction of the thin arrow in the image is the first direction, which is the arrangement direction of the battery cells 8.

[0048] The exposed area 801 is an opening on the insulating plate 803 on the top of the cover plate, through which the upper heat exchange plate 2 directly contacts the cover plate surface of the battery cell 8. The exposed area 801 can be a rectangular opening, a square opening, a circular opening, or an opening of other shapes.

[0049] The battery pack of this utility model has an exposed area 801 on the insulating plate 803 of the battery cell 8, so that a part of the cover plate is in direct contact with the upper heat exchange plate 2. Since the cover plate is made of metal, metal has high thermal conductivity, and the heat transferred to the upper heat exchange plate 2 does not pass through the insulating plate 803. The upper heat exchange plate 2 is in direct contact with the corresponding position of the exposed area 801 on the battery cover plate. The heat of the battery cell 8 can be quickly conducted to the upper heat exchange plate 2 through the exposed metal plate surface at the exposed area 801, thereby cooling the battery cell 8. This greatly improves the heat exchange efficiency of the cooling plate, provides better temperature control and regulation of the battery pack, improves battery safety performance, and extends battery life.

[0050] To improve thermal conductivity, the upper heat exchange plate 2 is bonded to the exposed cover plate area of ​​the exposed area 801 via a first connecting layer 9, such as... Figure 5 and Figure 6As shown, the first connecting layer 9 is disposed on the surface of the upper heat exchange plate 2 near the battery cell 8, and the first connecting layer 9 is a thermally conductive structural adhesive. The upper heat exchange plate 2 is directly connected to the cover area exposed at the exposed area 801 through the first connecting layer 9. Heat transfer to the upper heat exchange plate 2 does not need to pass through the insulating plate 803, which improves the efficiency of heat conduction to the upper heat exchange plate 2. Moreover, the bonding strength between the upper heat exchange plate 2 and the plastic insulating plate 803 is less than the bonding strength between the upper heat exchange plate 2 and the metal cover plate. Connecting the upper heat exchange plate 2 to the metal cover plate fixes the position of the upper heat exchange plate 2, preventing the position of the upper heat exchange plate 2 from shifting, and improving the positional reliability of the upper heat exchange plate 2. In order to improve the heat dissipation performance of the upper heat exchange plate 2, a second connecting layer 10 is disposed on the surface of the upper heat exchange plate 2 away from the battery cell 8. The upper heat exchange plate 2 is connected to the cover of the top opening of the housing 1 through the second connecting layer 10, so that the heat of the upper heat exchange plate 2 can also be dissipated through the cover, further improving the heat dissipation efficiency. The second connecting layer 10 is a thermally conductive structural adhesive. The upper heat exchange plate 2 has a first coolant delivery chamber 201 inside, such as... Figure 8 As shown, a first coolant delivery chamber 201 extends along a first direction, and multiple first coolant delivery chambers 201 are provided to improve the uniformity of coolant delivery. The thermal conductivity of the thermally conductive structural adhesive is not less than 1~3.5 W / (m·K).

[0051] Specifically, the upper heat exchange plate 2 can be made of metal or non-metal. When the upper heat exchange plate 2 is made of metal, an insulating layer is sprayed onto its outer surface to achieve insulation. When the upper heat exchange plate 2 is made of non-metal, an insulating layer is not required.

[0052] In one embodiment, the first surface of the battery cell 8 has two output terminals 802, and an exposed area 801 is disposed between the two output terminals 802. The output terminals 802 are the battery's terminals. During battery use, the area between the two output terminals 802 generates the most heat, which is difficult to dissipate. Distributing the exposed area 801 between the two output terminals 802... Figure 4 In the middle position, the upper heat exchange plate 2 directly contacts the middle area of ​​the cover plate for heat exchange, such as... Figure 3 As shown, this allows for the rapid dissipation of heat from the central region of the battery cell 8.

[0053] In another embodiment, the first surface of the battery cell 8 is provided with two output terminals 802, which are the battery terminals. An exposed area 801 is located on the outer side of the two output terminals 802, such as... Figure 9 As shown. An upper heat exchange plate 2 is correspondingly installed on the upper part of the exposed area 801, as... Figure 10As shown. When an exposed area 801 is provided at each end of the cover plate of the battery cell 8, the upper heat exchange plate 2 can simultaneously exchange heat at the close ends of two adjacent battery packs. By increasing the heat exchange area on the battery cell 8, the uniformity and efficiency of heat exchange for the battery pack are improved, thereby improving the temperature consistency of the battery pack. The structure of the exposed area 801 in this embodiment is suitable for cases where multiple battery packs are provided, and the multiple battery packs are arranged along a second direction, which is... Figure 3 As shown by the thick arrow in the figure, the second direction is perpendicular to the first direction, and the upper heat exchange plate 2 is disposed on the exposed areas 801 of the two adjacent battery packs.

[0054] In another embodiment, the battery cell 8 further has a second surface, on which an output terminal 802 is disposed. An exposed area 801 is disposed on the first surface of the battery cell 8, and the second surface is disposed adjacent to the first surface, such as... Figure 11 As shown, the upper heat exchange plate 2 is connected to a portion of the cover plate exposed at the exposed area 801 via the first connecting layer 9. In this embodiment, the first side of the battery cell 8 does not have an output terminal 802, so the area of ​​the exposed area 801 can be expanded according to the heat dissipation requirements. Correspondingly, the width of the upper heat exchange plate 2 is increased, thereby improving the heat exchange efficiency of the battery pack.

[0055] Furthermore, an explosion-proof valve is provided on the battery cell 8. The explosion-proof valve is located on the surface of the battery casing opposite to the output end 802, that is, on the bottom surface of the battery casing. The output end 802 and the explosion-proof valve are located on different surfaces, so that the upper heat exchange plate 2 does not need to avoid the position of the explosion-proof valve when it is installed, which can increase the area of ​​the exposed area 801 and thus improve the heat exchange efficiency.

[0056] The ratio of the projected area of ​​the upper heat exchange plate 2 on the first surface of the battery cell 8 to the area of ​​the exposed area 801 is 1.1-2.5, preferably 2.3. This ratio is preferably within the aforementioned range. If the ratio is too large, the exposed heat-conducting area of ​​the exposed area 801 will be small, resulting in reduced heat conduction efficiency. If the ratio is too small, one possibility is that the heat exchange area of ​​the upper heat exchange plate 2 will be small, leading to low heat conduction efficiency; another possibility is that the area of ​​the exposed area 801 will be too large, increasing the risk of insulation failure.

[0057] In one embodiment, such as Figure 4As shown, the first surface of the battery cell 8 has two output terminals 802. The distance D1 between the edge of the exposed area 801 near the output terminal 802 and the center of the output terminal 802 is 30-50mm. If the distance between the edge of the exposed area 801 and the output terminal 802 is too small, there is a risk of insulation failure. If the distance between the edge of the exposed area 801 and the output terminal 802 is too large, the area of ​​the exposed area 801 will be reduced, affecting the heat conduction area and resulting in low heat conduction efficiency.

[0058] To ensure insulation and thermal conductivity, the distance D2 between the exposed area 801 and the long edge of the first surface is 2-6 mm, meaning the distance D2 between the exposed area 801 and the long edge of the insulating plate 803 is also D2. When the battery casing is a cuboid structure, the long edge of the insulating plate 803 corresponds to the large surface of the battery cell 8. The large surface of the battery cell 8 refers to the surface where two adjacent battery cells 8 are close to each other when assembled into a battery pack. If the distance between the exposed area 801 and the large surface of the battery cell 8 is too large, the area of ​​the exposed area 801 will be small, resulting in low thermal conductivity; if the distance is too small, the risk of insulation failure between two adjacent battery cells 8 is greater.

[0059] In order to achieve full-area heat conduction of the exposed area 801, the projection of the upper heat exchange plate 2 on the first surface of the battery cell 8 covers the exposed area 801. Thus, when the upper heat exchange plate 2 is connected to the exposed area 801, the upper heat exchange plate 2 can achieve full-area contact with the exposed area 801, so that the heat conducted from the exposed area 801 can be directly transferred to the upper heat exchange plate 2, thereby improving the heat conduction efficiency.

[0060] In one embodiment, both sides of the upper heat exchange plate 2 along the first direction are located outside the exposed area 801, such as... Figure 13 As shown. In another embodiment, one side of the upper heat exchange plate 2 along the first direction is located outside one side of the exposed area 801 along the first direction, and the other side is flush with the other side of the exposed area 801 along the first direction, as shown. Figure 12 As shown. In the third embodiment, the two sides of the upper heat exchange plate 2 along the first direction are flush with the two sides of the exposed area 801 along the first direction, as shown. Figure 14 As shown.

[0061] Furthermore, refer to Figure 13The battery cell 8 has two output terminals 802 on its first surface. The width of the upper heat exchange plate 2 is a first distance W, and the distance between the two output terminals 802 is a second distance L. The ratio of the first distance W to the second distance L is 0.4-0.8. Preferably, the ratio of the first distance W to the second distance L can be 0.4, 0.6, or 0.8. The ratio of the first distance W to the second distance L is preferably within the above range. If the ratio is too small, the size of the upper heat exchange plate 2 covering the length of the battery cell 8 will be too small, resulting in low heat exchange efficiency. If the ratio is too large, the upper heat exchange plate 2 will be too close to the output terminals 802, which may interfere with the setting of other structures and may cause insulation failure between the upper heat exchange plate 2 and the output terminals 802. The first distance W is 60-105mm, and the second distance L is 60-130mm. Specifically, the first distance W can be 60mm, 70mm, 80mm, 90mm, 100mm, or 105mm; the second distance L can be 80mm, 90mm, 100mm, 110mm, 120mm, or 130mm.

[0062] To increase energy storage capacity, the battery pack contains multiple battery modules, which are arranged along a second direction. Figure 3 As shown by the thick arrow in the diagram. The number of upper heat exchange plates 2 is the same as the number of battery packs. Each battery pack has one upper heat exchange plate 2 on its top surface, and the multiple upper heat exchange plates 2 are spaced apart along the second direction. One end of each of the multiple upper heat exchange plates 2 is connected through a first manifold 5, and the other end is connected through a second manifold 4, as shown in the diagram. Figure 15 The upper heat exchange plate 2 includes an inlet heat exchange pipe 202 and an outlet heat exchange pipe 203. In one embodiment, three inlet heat exchange pipes 202 and three outlet heat exchange pipes 203 are provided. The first manifold 5 includes an inlet chamber and an outlet chamber separated by a partition. The second manifold 4 includes a connecting chamber that connects the inlet heat exchange pipes 202 and the outlet heat exchange pipes 203. The inlet chamber is connected to the upper inlet port and the inlet end of the inlet heat exchange pipe 202. The outlet end of the inlet heat exchange pipe 202 is connected to the connecting chamber of the second manifold 4. The connecting chamber is connected to the inlet of the outlet heat exchange pipe 203. The outlet of the outlet heat exchange pipe 203 is connected to the outlet chamber. The outlet chamber is connected to the upper outlet port. The heat exchange medium flows through the manifolds within the multiple upper heat exchange plates 2 to achieve heat exchange for multiple battery packs.

[0063] To improve the structural strength of the battery pack system, both the first current collector 5 and the second current collector 4 are provided with multiple connecting lugs. The first current collector 5 and the second current collector 4 are connected to the frame of the housing 1 by fasteners connected to the connecting lugs. The fasteners are commonly used connectors in the prior art, including connecting bolts, connecting screws, or connecting studs.

[0064] The housing 1 includes a bottom frame and several side frames. Specifically, the side frames include a front beam 101, a rear beam 102, and side beams 104, as shown below. Figure 2 As shown, two side beams 104 are provided, connecting the ends of the front beam 101 and the rear beam 102. The housing 1 also includes a middle beam 103, which is perpendicular to the first direction. Its two ends are connected to the two side beams 104 respectively, and its bottom is mounted on the bottom frame. The middle beam 103 is connected to the middle position of the side beams 104, and its top surface contacts the surface of the upper heat exchange plate 2 near the battery cell 8, thereby supporting the middle position of the upper heat exchange plate 2 and improving the structural reliability of the upper heat exchange plate 2. The first manifold 5 and the second manifold 4 are connected to the front beam 101 and the rear beam 102 through the connecting lugs.

[0065] To improve the heat exchange efficiency of the battery pack, the battery pack also includes a lower heat exchange plate 3. The lower heat exchange plate 3 has a clearance hole 301 at the position corresponding to the explosion-proof valve. Figure 2 and Figure 16 As shown, the clearance hole 301 is connected to the venting chamber at the bottom of the battery pack, and second coolant delivery chambers 302 are provided on both sides of the clearance hole 301, such as... Figure 17 As shown, the second coolant delivery chamber 302 extends along the first direction. The inlet end of the second coolant delivery chamber 302 is connected to the lower inlet port, and the outlet end of the second coolant delivery chamber 302 is connected to the lower outlet port. The water inlet end of the upper heat exchange plate 2 is connected to the upper inlet port, and the water outlet end of the upper heat exchange plate 2 is connected to the upper outlet port. The lower inlet port and the upper inlet port are connected to the main inlet port 6, and the lower outlet port and the upper outlet port are connected to the main outlet port 7.

[0066] To further improve the positional reliability of the upper heat exchanger plate 2, the middle position of the upper heat exchanger plate 2 is connected to the intermediate beam 103 by a connecting plate 11 and screws, such as... Figure 18 and Figure 19 As shown, the middle part of the connecting plate 11 is raised and covers the upper heat exchange plate 2, and the two ends of the connecting plate 11 are connected to the intermediate beam 103 by screws connected in the connecting through hole 1101.

[0067] The battery pack of this utility model has high heat exchange efficiency by setting an upper heat exchange plate 2 and a lower heat exchange plate 3 to exchange heat on the upper and lower surfaces of the battery cells 8. This results in better temperature control and regulation of the battery pack, better battery safety performance, more charge and discharge cycles, and a longer service life.

[0068] In the description of this solution, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0069] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0070] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, comprising a housing, wherein a battery pack is disposed within the housing, characterized in that, The battery pack includes multiple battery cells arranged along a first direction. Each battery cell has a first surface with an exposed area. An upper heat exchange plate is provided above the exposed area. The upper heat exchange plate contacts the metal surface of the battery cell through the exposed area and extends along the first direction.

2. The battery pack according to claim 1, characterized in that, The upper heat exchange plate is connected to the metal surface of the exposed area through a first connecting layer.

3. The battery pack according to claim 1 or 2, characterized in that, The first side of the battery cell is provided with two output terminals, and the exposed area is located between the two output terminals.

4. The battery pack according to claim 1 or 2, characterized in that, The first side of the battery cell has two output terminals, and the exposed area is located on the outside of the two output terminals.

5. The battery pack according to claim 1 or 2, characterized in that, The battery cell also has a second side, on which an output terminal is provided.

6. The battery pack according to claim 4, characterized in that, The battery packs are arranged in multiple ways along a second direction, which is perpendicular to the first direction. The upper heat exchange plate is disposed on the exposed area of ​​two adjacent battery packs.

7. The battery pack according to claim 1, characterized in that, The ratio of the projected area of ​​the upper heat exchange plate on the first surface of the battery cell to the area of ​​the exposed area is 1.1 to 2.

5.

8. The battery pack according to claim 7, characterized in that, The first side of the battery cell has two output terminals, and the distance between the edge of the exposed area near the output terminal and the center of the output terminal is 30-50mm.

9. The battery pack according to claim 8, characterized in that, The distance between the exposed area and the long edge of the first surface is 2-6 mm.

10. The battery pack according to claim 7, characterized in that, The projection of the upper heat exchange plate onto the first surface covers the exposed area.

11. The battery pack according to claim 10, characterized in that, Both sides of the upper heat exchange plate along the first direction are located outside the exposed area.

12. The battery pack according to claim 10, characterized in that, The two sides of the upper heat exchange plate along the first direction are flush with the two sides of the exposed area along the first direction. Alternatively, one side of the upper heat exchange plate along the first direction is located outside one side of the exposed area along the first direction, and the other side is flush with the other side of the exposed area along the first direction.

13. The battery pack according to claim 3, characterized in that, The width of the upper heat exchange plate is the first distance, the distance between the two output ends is the second distance, and the ratio of the first distance to the second distance is 0.4-0.

8.

14. The battery pack according to claim 13, characterized in that, The first distance is 60-105mm, and the second distance is 60-130mm.

15. The battery pack according to claim 1, characterized in that, The battery packs are provided in multiple ways, and the multiple battery packs are arranged along the second direction. The number of upper heat exchange plates is the same as the number of battery packs. Each battery pack has an upper heat exchange plate on its top surface, and the multiple upper heat exchange plates are spaced apart along the second direction. The multiple upper heat exchange plates are connected by a manifold, which is provided with an upper liquid inlet and an upper liquid outlet.

16. The battery pack according to claim 15, characterized in that, The housing includes several frames, and the manifold is provided with connecting ears, which are connected to the frames by fasteners.

17. The battery pack according to claim 1, characterized in that, It also includes a lower heat exchange plate, which is provided with a lower liquid inlet and a lower liquid outlet; The water inlet of the upper heat exchange plate is connected to the upper liquid inlet, the water outlet of the upper heat exchange plate is connected to the upper liquid outlet, the lower liquid inlet and the upper liquid inlet are both connected to the main liquid inlet, and the upper liquid outlet and the lower liquid outlet are both connected to the main liquid outlet.

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