Battery pack, temperature control system of battery pack and charging pile

Abstract

The embodiment of the utility model provides a battery pack, a temperature control system of the battery pack and a charging pile, the battery pack comprises a box body, a battery located in the box body and a plate located between the battery and a bottom plate of the box body, and the plate is a supporting plate for supporting the battery or a cold plate capable of conducting heat exchange on the battery. A first cavity capable of containing a heat exchange medium is formed between the plate and the bottom plate in a closed mode, and the first cavity is provided with a liquid inlet and a liquid outlet. In the charging process of the battery pack, the temperature control system pumps the heat exchange medium into the first cavity to dissipate heat of the battery pack, so that the heat dissipation performance of the battery pack is improved, and the battery pack is not prone to overheating during high-rate fast charging.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack, a temperature control system for a battery pack, and a charging pile. Background Art

[0002] The battery pack includes a box and batteries. The batteries are located in the box and have an explosion-proof valve. When the pressure inside the battery exceeds the set upper limit, the explosion-proof valve will automatically open to release the pressure to prevent the battery from rupture, explosion, thermal runaway and other accidents due to excessive internal pressure.

[0003] With the popularization of high-rate fast charging technology, higher requirements are being placed on the heat dissipation performance of battery packs during charging. How to improve the heat dissipation performance of battery packs during charging is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] In order to further improve the heat dissipation performance of the battery pack during charging, the present application provides a battery pack, which includes a case, a battery and a plate, the battery and the plate are located in the case, the case includes a bottom plate, the plate is located between the battery and the bottom plate, the plate is a support plate supporting the battery or a cold plate capable of exchanging heat for the battery, and the plate and the bottom plate are sealed to form a first chamber that can accommodate a heat exchange medium, and the first chamber has a liquid inlet and a liquid outlet.

[0005] In one embodiment of the battery pack, the battery pack includes a first separator, wherein the first separator separates a flow channel in the first chamber.

[0006] In one embodiment of the battery pack, the first separator is an elastic sealing gasket, and the first separator is in direct sealing contact with the bottom plate and the plate; or

[0007] The first partition is integrated with one of the bottom plate and the plate, and the first partition is indirectly in sealing contact with the other of the bottom plate and the plate through a sealing gasket.

[0008] In one embodiment of the battery pack, an orthographic projection of the first separator on the plate does not overlap with an orthographic projection of the explosion-proof valve of the battery on the plate.

[0009] In one embodiment of the battery pack, the orthographic projection area of the first separator on the bottom plate is S1, the area of the bottom plate is S2, and 0.3≤S1 / S2≤0.7.

[0010] In one embodiment of the battery pack, the plate and the bottom plate are sealed by welding or by providing a sealing ring to form the first chamber.

[0011] In one embodiment of the battery pack, the cold plate includes a first plate and a second plate, the first chamber is formed between the second plate and the bottom plate, the first plate is located between the second plate and the battery, and the first plate and the second plate are enclosed to form a second chamber that can accommodate a heat exchange medium, and the second chamber has a liquid inlet and a liquid outlet.

[0012] In one embodiment of a battery pack, the battery pack includes a second separator, which separates a flow channel in the second chamber, and the orthographic projection of the first separator on the bottom plate at least partially overlaps with the orthographic projection of the second separator on the bottom plate.

[0013] The present application also provides a temperature control system for a battery pack, which includes a liquid storage device that can store heat exchange medium, a delivery pump that can provide circulation power to the heat exchange medium, a flow regulating valve that can adjust the flow of heat exchange medium in and out of the first chamber of the battery pack, and a pressure regulating valve that can adjust the pressure of the first chamber. The liquid storage device is connected to the liquid inlet and liquid outlet of the first chamber of the battery pack, and the delivery pump, flow regulating valve, and pressure regulating valve are all connected to the heat exchange medium circulation path.

[0014] The present application also provides a charging pile, which includes a charging system and the above-mentioned temperature control system.

[0015] The technical effect of the present application is as follows: During the charging process of the battery pack, a heat exchange medium is transported into the first chamber to dissipate heat from the battery pack, thereby improving the heat dissipation performance of the battery pack and preventing the battery pack from overheating even during high-rate fast charging. The heat exchange medium in the first chamber can be extracted after charging is completed. In the non-charging state, the air in the first chamber can isolate the battery from the influence of the external temperature. When the explosion-proof valve of the battery is located on the side where the plate is located, the airflow breaks through the plate to release pressure after the explosion-proof valve is opened. In this case, the first chamber can also provide pressure relief space for the explosion-proof valve of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic plan view of a partial structure of an embodiment of a battery pack provided in this application;

[0017] Figure 2 A three-dimensional schematic diagram of a battery pack according to an embodiment of the present application showing a disassembled second plate and a bottom plate;

[0018] Figure 3 A three-dimensional schematic diagram of another embodiment of the battery pack provided by the present application showing the support plate and the bottom plate in a disassembled state;

[0019] Figure 4 A schematic plan view of an embodiment of the temperature control system provided in this application;

[0020] Figure 5A schematic plan view of an embodiment of a charging pile provided in this application;

[0021] The following are the descriptions of the reference numerals:

[0022] 100 battery pack;

[0023] 101 battery, 102 bottom plate, 103 plate, 103a cold plate, 1031 first plate, 1032 second plate, 103b support plate, 104 first chamber, 105 second chamber, 106 first separator, 107 second separator, 108 connecting pipe, A weak area, B liquid inlet, C liquid outlet;

[0024] 200 temperature control system;

[0025] 201 liquid storage device, 202 delivery pump, 203 flow regulating valve, 204 pressure regulating valve;

[0026] 300 charging stations;

[0027] 301 charging device, 302 charging gun. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0029] like Figure 1 As shown, the battery pack 100 provided in the present application includes a case, a battery 101 and a plate 103. The battery 101 and the plate 103 are located in the case. The case includes a bottom plate 102. The plate 103 is located between the battery 101 and the bottom plate 102. A first chamber 104 that can accommodate a heat exchange medium is formed between the plate 103 and the bottom plate 102. The first chamber 104 has a liquid inlet (indicated by B in the figure) and a liquid outlet (indicated by C in the figure). The liquid inlet and the liquid outlet can be both provided on the plate 103, or both provided on the bottom plate 102, or one is provided on the plate 103 and the other is provided on the bottom plate 102, or the liquid inlet and the liquid outlet are the same port.

[0030] During the charging process of the above-mentioned battery pack 100, a heat exchange medium is transported into the first chamber 104 to dissipate heat from the battery pack 100, thereby improving the heat dissipation performance of the battery pack 100 and making it less likely for the battery pack 100 to overheat even during high-rate fast charging. After charging is completed, the heat exchange medium in the first chamber 104 can be extracted. In the non-charging state, the air in the first chamber 104 can isolate the battery 101 from the influence of the external temperature. When the explosion-proof valve of the battery 101 is located on the side where the plate 103 is located, after the explosion-proof valve is opened, the air flow breaks through the plate 103 to release pressure. In this case, the first chamber 104 can also provide a pressure relief space for the explosion-proof valve of the battery 101.

[0031] The shape of the battery 101 can be designed according to actual needs. For example, in some embodiments, the battery 101 is a cylindrical battery, and in some embodiments, the battery 101 is a square-shell battery.

[0032] The method for enclosing and forming the first chamber 104 can be designed based on actual needs. For example, in some embodiments, a full circle of welding is performed between the plate 103 and the base plate 102, and the first chamber 104 is located inside the full circle of the weld mark, and the first chamber 104 is formed by enclosing the weld mark through welding. In some embodiments, a sealing ring is provided between the plate 103 and the base plate 102, and the first chamber 104 is located inside the sealing ring, and the sealing ring is used to enclose the first chamber 104. When the sealing ring is used to enclose the first chamber 104, the plate 103 and the base plate 102 can be fixed by welding or by fasteners.

[0033] In some embodiments, a pipe 108 is provided in the first chamber 104 (see Figure 3 ), one end of the connecting pipe 108 extends through the liquid inlet or liquid outlet of the first chamber 104 to facilitate external connection to a pumping device, a liquid storage device 201, etc.

[0034] In some embodiments, the plate 103 is a cold plate 103a (refer to Figure 1 ), the cold plate 103a can exchange heat with the battery 101. In some embodiments, the cold plate 103a includes a first plate 1031 and a second plate 1032, the first plate 1031 is located between the second plate 1032 and the battery 101, the first chamber 104 is formed between the second plate 1032 and the bottom plate 102, and the first plate 1031 and the second plate 1032 are sealed to form a second chamber 105 that can accommodate a heat exchange medium. The second chamber 105 has a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet can be both provided on the first plate 1031 or both provided on the second plate 1032, or one provided on the first plate 1031 and the other provided on the second plate 1032, or the liquid inlet and the liquid outlet are the same port. In some embodiments, the plate 103 is a support plate 103b (refer to Figure 3 ), used to support the battery 101, the support plate 103b cannot exchange heat for the battery 101.

[0035] In some embodiments, the support plate 103b or the second plate 1032 is a flat plate, and the base plate 102 is also a flat plate. In this case, the support plate 103b or the second plate 1032 must be spaced apart from the base plate 102 to form the first chamber 104 therebetween. In some embodiments, the support plate 103b or the second plate 1032 is a grooved plate having a first groove that is recessed from a side close to the base plate 102 to a side away from the base plate 102, the base plate 102 is a flat plate, and the first chamber 104 is formed between the first groove and the base plate 102. Alternatively, the base plate 102 is a grooved plate having a second groove that is recessed from a side close to the support plate 103b or the second plate 1032 to a side away from the support plate 103b or the second plate 1032, and the first chamber 104 is formed between the first groove and the second groove. In some embodiments, the base plate 102 is a groove plate having a second groove that is recessed from a side close to the support plate 103b or the second plate 1032 to a side away from the support plate 103b or the second plate 1032, the support plate 103b or the second plate 1032 is a flat plate, and the first chamber 104 is formed between the second groove and the support plate 103b or the second plate 1032.

[0036] In some embodiments, the first plate 1031 is a flat plate and the second plate 1032 is also a flat plate. In this case, the first plate 1031 must be spaced apart from the second plate 1032 to form the second chamber 105 therebetween. In some embodiments, the first plate 1031 is a slotted plate having a third groove that is recessed from a side proximal to the second plate 1032 toward a side distal to the second plate 1032, the second plate 1032 is a flat plate, and the second chamber 105 is formed between the third groove and the second plate 1032. Alternatively, the second plate 1032 is a slotted plate having a fourth groove that is recessed from a side proximal to the first plate 1031 toward a side distal to the first plate 1031, and the second chamber 105 is formed between the third groove and the fourth groove. In some embodiments, the second plate 1032 is a slotted plate having a fourth groove that is recessed from a side proximal to the first plate 1031 toward a side distal to the first plate 1031, the first plate 1031 is a flat plate, and the second chamber 105 is formed between the fourth groove and the first plate 1031.

[0037] In some embodiments, the battery pack 100 includes a first separator 106 (refer to Figure 2 or Figure 3 ), the first separator 106 separates the flow channel in the first chamber 104, and the first separator 106 can also indirectly support the battery 101. In some embodiments, the first separator 106 is an elastic sealing gasket, and the first separator 106 is in direct sealing contact with the bottom plate 102 and the plate 103. In some embodiments, the first separator 106 is integrally provided with the bottom plate 102 ( Figure 2 and Figure 3In other words, the first separator 106 is part of the bottom plate 102 and is indirectly in sealing contact with the plate 103 via a sealing gasket. In some embodiments, the first separator 106 is integrally formed with the plate 103 (specifically, the support plate 103b or the second plate 1032). In other words, the first separator 106 is part of the support plate 103b or the second plate 1032 and is indirectly in sealing contact with the bottom plate 102 via a sealing gasket.

[0038] In some embodiments, the battery pack 100 includes a second separator 107 (refer to Figure 2 ), the second separator 107 separates the flow channel in the second chamber 105, and the second separator 107 can also indirectly support the battery 101. In some embodiments, the second separator 107 is an elastic sealing gasket, and the second separator 107 is directly in sealing contact with the first plate 1031 and the second plate 1032. In some embodiments, the second separator 107 and the first plate 1031 are integrally provided, that is, the second separator 107 is a part of the first plate 1031, and the second separator 107 is indirectly in sealing contact with the first plate 1031 through the sealing gasket. In some embodiments, the second separator 107 and the second plate 1032 are integrally provided ( Figure 2 In this embodiment, the second separator 107 is a part of the second plate 1032, and the second separator 107 is in sealing contact with the first plate 1031 indirectly through the sealing gasket.

[0039] The number, shape, arrangement position and arrangement direction of the first partition 106 and the second partition 107 can be designed according to actual needs. In some embodiments, the first partition 106 and the second partition 107 have the same shape, both of which are straight strips ( Figure 2 The shapes of the first partition 106 and the second partition 107 may also be different, and may be arc-shaped, block-shaped, etc. In some embodiments, the first partition 106 and the second partition 107 are parallel to each other ( Figure 2 For this solution, the liquid flow direction in the first chamber 104 is parallel to the liquid flow direction in the second chamber 105. In some embodiments, the first partition 106 and the second partition 107 are arranged at an angle greater than 0° and less than 180°, so that the liquid flow direction in the first chamber 104 and the liquid flow direction in the second chamber 105 are parallel to each other.

[0040] In some embodiments, the orthographic projection of the first partition 106 on the bottom plate 102 and the orthographic projection of the second partition 107 on the bottom plate 102 at least partially overlap, for example, Figure 2In the embodiment, the orthographic projections of the four first spacers 106 on the bottom plate 102 are substantially completely within the orthographic projections of the four second spacers 107 on the bottom plate 102. In this way, the support for the battery 101 is better.

[0041] In some embodiments, the explosion-proof valve of the battery 101 is located on the side where the plate 103 is located (that is, the bottom side of the battery 101), and the orthographic projection of the first separator 106 on the plate 103 does not overlap with the orthographic projection of the explosion-proof valve of the battery 101 on the plate 103. For example, Figure 2 In the figure, the positive projection of the explosion-proof valve on the plate 103 (the area within the oblique circle) falls on the two second partitions 107. The two second partitions 107 and the four first partitions 106 are staggered with each other in the horizontal direction. In this way, the explosion-proof valve does not need to break through the first partition 106 when releasing pressure, and can release pressure into the first chamber 104, which has a larger pressure relief space.

[0042] In some embodiments, the explosion-proof valve of the battery 101 is located on the side where the plate 103 is located (that is, the bottom side of the battery 101), and the orthographic projection of the explosion-proof valve on the plate 103 falls on the second separator 107, for example, Figure 2 In the figure, the orthographic projection of the explosion-proof valve on the plate 103 (the area within the oblique circle) falls on the two second partitions 107, so that the second partitions 107 can support the explosion-proof valve.

[0043] In some embodiments, the orthographic projection area of the first separator 106 on the bottom plate 102 is S1, the area of the bottom plate 102 is S2, and 0.3≤S1 / S2≤0.7. In this way, the support area of the first separator 106 for the battery 101 and the circulation space of the heat exchange medium in the first chamber 104 can be taken into account, thereby achieving both good support effect and good heat dissipation effect of the battery 101.

[0044] In some embodiments, the plate 103 is provided with a weak area A. The weak area A of the plate 103 at least partially overlaps with the orthographic projection of the explosion-proof valve of the battery 101 on the plate 103. This allows the explosion-proof valve to easily break through the plate 103 and release pressure. In some embodiments, the weak area A is formed by thinning or scoring. When the plate 103 includes a first plate 1031 and a second plate 1032, in some embodiments, both the first plate 1031 and the second plate 1032 are provided with a weak area A, and the orthographic projection of the weak area A of the first plate 1031 on the second plate 1032 at least partially overlaps with the weak area A of the second plate 1032. In some embodiments, only the first plate 1031 is provided with a weak area A, while the second plate 1032 is not provided with a weak area A.

[0045] like Figure 4As shown, the temperature control system 200 provided in the present application includes a liquid storage device 201, a delivery pump 202, a flow regulating valve 203 and a pressure regulating valve 204. The liquid storage device 201 can store heat exchange medium, and the liquid storage device 201 is connected to the liquid inlet and liquid outlet of the first chamber 104. The delivery pump 202 can deliver the heat exchange medium from the liquid storage device 201 to the first chamber 104 of the battery pack 100 and pump the heat exchange medium from the first chamber 104 to the liquid storage device 201, thereby providing circulation power for the heat exchange medium. The delivery pump 202, the flow regulating valve 203 and the pressure regulating valve 204 are all connected to the heat exchange medium circulation path. The flow regulating valve 203 can adjust the flow of heat exchange medium in and out of the first chamber 104. The pressure regulating valve 204 can adjust the pressure of the first chamber 104.

[0046] During the charging process of the battery pack 100, the delivery pump 202 delivers the heat exchange medium in the liquid storage device 201 into the first chamber 104 of the battery pack 100 through the liquid inlet. The heat exchange medium in the first chamber 104 then flows back to the liquid storage device 201 through the liquid outlet, forming a heat exchange medium circulation system, thereby dissipating heat from the battery pack 100. During this process, the flow rate of the heat exchange medium in and out of the first chamber 104 can be adjusted by adjusting the opening of the flow control valve 203 and / or the power of the delivery pump 202. The pressure of the first chamber 104 can also be adjusted using the pressure regulating valve 204 to a pressure that facilitates the injection of the heat exchange medium. After charging is completed, the delivery pump 202 returns the heat exchange medium in the first chamber 104 to the liquid storage device 201.

[0047] Figure 4 In the illustrated embodiment, two delivery pumps 202 are provided: one connected to the liquid inlet of the first chamber 104 for delivering the heat exchange medium in the liquid storage device 201 to the first chamber 104, and the other connected to the liquid outlet of the first chamber 104 for pumping the heat exchange medium in the first chamber 104 to the liquid storage device 201. Two flow control valves 203 are also provided: one connected to the liquid inlet of the first chamber 104 for regulating the flow of the heat exchange medium entering the first chamber 104, and the other connected to the liquid outlet of the first chamber 104 for regulating the flow of the heat exchange medium out of the first chamber 104. Two pressure regulating valves 204 are also provided: one connected to the liquid inlet of the first chamber 104, and the other connected to the liquid outlet of the first chamber 104. The number of delivery pumps 202, flow control valves 203, and pressure regulating valves 204 can be adjusted according to actual needs.

[0048] like Figure 5 As shown, the charging pile provided in this application includes the above-mentioned temperature control system 200 and also includes a charging system 300.

[0049] In some embodiments, the charging system 300 includes a charging device 301 and a charging gun 302. The charging gun 302 can be docked with the charging port of a device to be charged to charge the device. The charging gun 302 integrates two channels. After the charging gun 302 is docked with the charging port of the device to be charged, one channel of the charging gun 302 connects the heat exchange medium outlet of the temperature control system 200 and the liquid inlet of the first chamber 104 of the battery pack 100 of the device to be charged. The other channel of the charging gun 302 connects the heat exchange medium inlet of the temperature control system 200 and the liquid outlet of the first chamber 104 of the battery pack 100 of the device to be charged, thereby enabling simultaneous charging and heat exchange of the battery pack 100.

[0050] The principles and implementation methods of the present application have been described above using specific examples. The description of the above embodiments is only intended to help understand the method and core concept of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, various improvements and modifications may be made to the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack, characterized in that: The battery pack (100) comprises a box, a battery (101) and a plate (103), wherein the battery (101) and the plate (103) are located in the box, the box comprises a bottom plate (102), the plate (103) is located between the battery (101) and the bottom plate (102), the plate (103) is a support plate (103b) supporting the battery (101) or a cold plate (103a) capable of performing heat exchange on the battery (101), and a first chamber (104) capable of accommodating a heat exchange medium is formed between the plate (103) and the bottom plate (102), wherein the first chamber (104) has a liquid inlet and a liquid outlet.

2. The battery pack according to claim 1, wherein: The battery pack (100) comprises a first partition (106), wherein the first partition (106) separates a flow channel in the first chamber (104).

3. The battery pack according to claim 2, wherein: The first partition (106) is an elastic sealing gasket, and the first partition (106) is in direct sealing contact with the bottom plate (102) and the plate (103); or, The first partition (106) is integrated with one of the bottom plate (102) and the plate (103), and the first partition (106) is indirectly in sealing contact with the other of the bottom plate (102) and the plate (103) via a sealing gasket.

4. The battery pack according to claim 2, wherein: The orthographic projection of the first partition (106) on the plate (103) does not overlap with the orthographic projection of the explosion-proof valve of the battery (101) on the plate (103).

5. The battery pack according to claim 2, wherein: The orthographic projection area of the first partition (106) on the bottom plate (102) is S1, the area of the bottom plate (102) is S2, and 0.3≤S1 / S2≤0.

7.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The plate (103) and the bottom plate (102) are sealed by welding or by providing a sealing ring to form the first chamber (104).

7. The battery pack according to any one of claims 2 to 5, characterized in that: The cold plate (103a) comprises a first plate (1031) and a second plate (1032); the first chamber (104) is formed between the second plate (1032) and the bottom plate (102); the first plate (1031) is located between the second plate (1032) and the battery (101); a second chamber (105) capable of accommodating a heat exchange medium is formed between the first plate (1031) and the second plate (1032); the second chamber (105) has a liquid inlet and a liquid outlet.

8. The battery pack according to claim 7, characterized in that: The battery pack (100) includes a second separator (107), the second separator (107) separating a flow channel in the second chamber (105), and an orthographic projection of the first separator (106) on the bottom plate (102) and an orthographic projection of the second separator (107) on the bottom plate (102) at least partially overlapping.

9. The temperature control system of the battery pack is characterized by: The temperature control system (200) includes a liquid storage device (201) capable of storing a heat exchange medium, a delivery pump (202) capable of providing circulation power to the heat exchange medium, a flow regulating valve (203) capable of regulating the flow of the heat exchange medium in and out of the first chamber (104) of the battery pack (100), and a pressure regulating valve (204) capable of regulating the pressure of the first chamber (104). The liquid storage device (201) is connected to a liquid inlet and a liquid outlet of the first chamber (104) of the battery pack (100), and the delivery pump (202), the flow regulating valve (203), and the pressure regulating valve (204) are all connected to a heat exchange medium circulation path.

10. Charging pile, characterized in that, The charging pile (300) comprises a charging system and the temperature control system (200) according to claim 9.

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