Battery pack and electric equipment with same

Abstract

The invention relates to the technical field of batteries, and provides a battery pack and electric equipment with the same. The battery pack comprises a battery and a heat exchange structure. The battery has a first surface and a second surface. The heat exchange structure comprises a first heat exchange plate and a second heat exchange plate which are in heat exchange coupling with the first surface and the second surface respectively, the first heat exchange plate is provided with a liquid inlet, the liquid inlet communicates with a plurality of first liquid inlet flow channels on the first heat exchange plate and a plurality of second liquid inlet flow channels on the second heat exchange plate, and the second heat exchange plate is provided with a liquid return opening and liquid return flow channels. And the heat exchange medium flows to the liquid return flow channel from the plurality of second liquid inlet flow channels. The orthographic projection of the first surface and the orthographic projection of the second surface on the corresponding heat exchange plates cover the at least two liquid inlet flow channels, and the liquid return flow channels are located outside the orthographic projection of the first surface and the orthographic projection of the second surface on the corresponding heat exchange plates. The temperature of the heat exchange medium in the covered liquid inlet flow channels is T1, the temperature difference between any two adjacent covered liquid inlet flow channels is delta T, T1 is larger than or equal to 10 DEG C and smaller than or equal to 30 DEG C, and delta T is larger than or equal to-5 DEG C and smaller than or equal to 5 DEG C.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular, to a battery pack and an electrical device having the same. Background Technology

[0002] The development of technologies such as electric vehicles and large-scale energy storage has placed higher demands on the energy density, power density, and cycle life of battery systems. Batteries continuously generate heat during charging and discharging; if this heat cannot be dissipated in a timely and effective manner, the battery temperature will rise. Excessively high temperatures can accelerate battery aging and even trigger serious safety issues such as thermal runaway.

[0003] To address this, related technologies incorporate a heat exchange structure on one side of the battery. This structure features flow channels for the heat exchange medium to flow through, and the medium thermally couples with the battery to remove heat. However, the heat exchange medium, having absorbed heat and increased in temperature, will still come into contact with other batteries in subsequent flow channels. This portion of the high-temperature heat exchange medium not only fails to provide effective cooling but may also transfer heat back to the cooler batteries, ultimately weakening the actual heat exchange efficiency of the structure. Summary of the Invention

[0004] In view of this, the present disclosure provides a battery pack and an electrical device having the same, which aims to improve the heat exchange efficiency of the heat exchange structure.

[0005] In a first aspect, the battery pack provided in this disclosure includes a battery and a heat exchange structure. The battery has a first surface and a second surface arranged adjacent to each other. The heat exchange structure includes a first heat exchange plate and a second heat exchange plate that are heat-coupled to the first surface and the second surface, respectively. The first heat exchange plate is provided with a liquid inlet, which connects to a plurality of first liquid inlet channels on the first heat exchange plate and a plurality of second liquid inlet channels on the second heat exchange plate. The plurality of first liquid inlet channels and the plurality of second liquid inlet channels are collectively referred to as a plurality of liquid inlet channels. The second heat exchange plate is provided with a liquid return port and a liquid return channel. The heat exchange medium flows through the plurality of second liquid inlet channels to the liquid return channel and flows out through the liquid return port. The orthographic projections of the first surface and the second surface on the corresponding heat exchange plate cover at least two liquid inlet channels, and the liquid return channels are located outside the orthographic projections of the first surface and the second surface on the corresponding heat exchange plate. The temperature of the heat exchange medium in the covered liquid inlet channel is T1, in °C. The temperature difference between any two adjacent covered liquid inlet channels is δT, in °C. 10 °C ≤ T1 ≤ 30 °C, -5 °C ≤ δT ≤ 5 °C.

[0006] Secondly, the electrical equipment provided in this disclosure includes the battery pack of the first aspect.

[0007] The beneficial effects of the battery pack disclosed herein are as follows: Because the heat exchange plate has multiple inlet channels that thermally couple with the first and second surfaces of the battery, the heat exchange area between the battery and the heat exchange structure is increased, improving heat exchange efficiency while ensuring temperature uniformity of the first and second surfaces of the battery. Furthermore, since the return channels are located outside the orthogonal projections of the first and second surfaces of the battery onto the corresponding heat exchange plate, increasing the inlet channels to enlarge the heat exchange area between the battery and the inlet channels avoids contact between the heated return channels and the battery surface, preventing problems such as poor heat exchange efficiency and inconsistent temperature differences between multiple battery surfaces, which would affect battery life and safety. When the heat exchange medium flows from the inlet channels to the return channels, it will no longer be thermally coupled with, or will be minimally coupled with, the first and second surfaces of the battery, thus preventing the heat exchange medium from transferring heat back to the first and second surfaces of the battery. By having the heat exchange medium flow sequentially through the inlet and return channels and constructing a unidirectional thermal coupling path between the heat exchange medium and the first and second surfaces of the battery, the heat exchange efficiency of the heat exchange structure can be ensured. Attached Figure Description

[0008] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0011] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present disclosure.

[0012] Figure 2 yes Figure 1 A schematic diagram of a portion of the battery pack.

[0013] Figure 3 yes Figure 1 A schematic diagram of the battery structure in the battery pack.

[0014] Figure 4 yes Figure 1 A cross-sectional view of a portion of the battery pack.

[0015] Figure 5 yes Figure 1 A cross-sectional view of the battery pack.

[0016] Figure 6 yes Figure 1 A cross-sectional view of the battery pack.

[0017] Figure 7 yes Figure 1 A cross-sectional view of the battery pack.

[0018] Figure 8 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present disclosure.

[0019] Explanation of reference numerals in the attached drawings: Battery pack - 100; Battery - 10; Casing - 11; First surface - 111; Second surface - 111; Terminal post - 12; Cell - 13; Conductor bus - 14; Heat exchange structure - 20; First heat exchange plate - 21; Second heat exchange plate - 22; First heat exchange plate - 21; Plate body - 213; First tube body - 211; Distribution channel - 2111; First connecting port - 2112; Second connecting port - 2113; Second tube body - 212; Tube body channel - 2121; Third connecting port - 2122; Fourth connecting port - 2123; Second heat exchange plate - 22; Flow distribution cavity - 221; Flow equalization section - 222; Flow equalization hole - 2 221; longitudinal partition - 223; short partition - 2231; long partition - 2232; first cavity - 224; second cavity - 225; narrow area - 2251; open area - 2252; return cavity - 226; transverse partition - 227; inlet channel - 228; merging cavity - 229; liquid inlet channel - 24; liquid inlet - 243; first liquid inlet channel - 241; second liquid inlet channel - 242; return channel - 25; return port - 251; third heat exchange plate - 23; box body - 30; box plate - 31; first crossbeam - 41; first beam body - 411; second crossbeam - 42; second beam body - 421; electrical equipment - 200. Detailed Implementation

[0020] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0021] <Example Battery> Figure 3 A battery 10 is shown, which can store chemical energy and controllably convert chemical energy into electrical energy. In the recyclable battery 10, the active materials can be activated by charging after discharge so that it can continue to be used.

[0022] It is understood that in this embodiment of the present disclosure, battery 10 refers to an energy storage device that can be repeatedly charged and discharged. Battery 10 can be a lithium-ion battery, sodium-ion battery, nickel-metal hydride battery, etc.

[0023] refer to Figure 3 The battery 10 includes a casing 11, terminals 12, and cells 13.

[0024] The housing 11 provides a receiving space to house the battery cell 13 and isolate it from the outside environment. The housing 11 includes a body with an opening at at least one end and a receiving cavity. The opening of the housing 11 can be closed by a cover plate to seal and isolate the internal environment of the battery 10 from the external environment.

[0025] For example, the material of the housing 11 may be one of copper, iron, aluminum, stainless steel, aluminum alloy, plastic and aluminum-plastic film, and this disclosure does not impose any particular limitation on it.

[0026] Cell 13 is the component in battery 10 where electrochemical reactions occur, and it is also the smallest unit in battery 10 capable of electrochemical reactions such as charging or discharging. Cell 13 typically includes a positive electrode, a negative electrode, and a separator. As an example, cell 13 can be a lithium-ion cell 13, which operates by the intercalation and deintercalation of lithium ions between the positive and negative electrodes.

[0027] It is understood that the battery cell 13 can be implemented in various ways. For example, the battery cell 13 can be a cylindrical battery cell 13 formed by winding a positive electrode sheet, a separator, and a negative electrode sheet. Alternatively, the battery cell 13 can be a battery cell 13 with a generally cuboid shape formed by winding or stacking a positive electrode sheet, a separator, and a negative electrode sheet. In the current embodiment, the battery cell 13 is cuboid in shape, and the housing 11 is a cuboid-shaped rigid shell to accommodate the battery cell 13.

[0028] The terminals 12 are used to connect to the cell 13 to output or input electrical energy to the battery 10. In the current embodiment, the battery 10 includes two terminals 12, which are respectively connected to the positive and negative terminals of the cell 13.

[0029] <Example Battery Pack> refer to Figure 1 and Figure 2 The battery pack 100 provided in this embodiment includes a plurality of batteries 10 and a housing 30. The housing 30 is provided with a receiving space to receive the plurality of batteries 10.

[0030] Battery 10 faces different performance and safety challenges under different temperature environments. For example, at low temperatures, the electrochemical reaction rate inside Battery 10 decreases significantly, which can easily lead to capacity decay, increased internal resistance, and reduced power output, and in severe cases, even failure to function properly. At high temperatures or during intense charging and discharging, Battery 10 generates a large amount of heat. If heat dissipation is not timely or uneven, it may cause localized overheating, resulting in safety hazards such as thermal runaway.

[0031] To ensure that the operating temperature of battery 10 is maintained within a suitable range, refer to Figure 2The battery pack 100 also includes a heat exchange structure 20, which is used to thermally couple with the battery 10 to regulate the temperature of the battery 10.

[0032] As one possible implementation, the heat exchange structure 20 can be constructed as a heat exchange plate and thermally connected to the battery 10. A heat exchange medium can be stored within the heat exchange structure 20, and cooling of the battery 10 can be achieved through the phase change of the heat exchange medium.

[0033] It is understandable that the state of the heat exchange medium can be gas, liquid, or a mixture of gas and liquid phases.

[0034] It is understandable that the heat exchange medium can be a coolant, which can be water, ethylene glycol-based coolant, propylene glycol-based coolant, fluorinated liquid, etc.

[0035] As an example, the heat exchange plate can be a liquid-cooled plate with liquid cooling channels inside. Optionally, the liquid-cooled plate also includes an inlet and an outlet, both of which are connected to a current collector for the inlet and outlet of the heat exchange medium. The liquid-cooled plate can be made of a material with a certain hardness and strength (such as stainless steel), so that the liquid-cooled plate is not easily deformed when the battery 10 is subjected to compression or impact, which can enable the battery 10 to have higher structural strength and improve safety performance.

[0036] It is understandable that liquid cooling plates can be made of various materials, such as copper, iron, aluminum, stainless steel, or aluminum alloy. Liquid cooling plates can also be made of nylon, plastic, etc.

[0037] refer to Figure 2 and Figure 4 In the current embodiment, the battery 10 has a first surface 111 and a second surface 112 arranged adjacent to each other. The heat exchange structure 20 includes a first heat exchange plate 21 and a second heat exchange plate 22 that are heat exchanged and coupled to the first surface 111 and the second surface 112, respectively. The first heat exchange plate 21 is provided with a liquid inlet 243, which connects to a plurality of first liquid inlet channels 241 on the first heat exchange plate 21 and a plurality of second liquid inlet channels 242 on the second heat exchange plate 22. The plurality of first liquid inlet channels 241 and the plurality of second liquid inlet channels 242 are collectively referred to as a plurality of liquid inlet channels 24. The second heat exchange plate 22 is provided with a liquid return port 251 and a liquid return channel 25. The heat exchange medium flows from the plurality of second liquid inlet channels 242 through the liquid return channel 25 and flows out from the liquid return port 251. The orthographic projections of the first surface 111 and the second surface 112 onto the corresponding heat exchange plates cover at least two liquid inlet channels 24, and the liquid return channel 25 is located outside the orthographic projections of the first surface 111 and the second surface 112 onto the corresponding heat exchange plates. The temperature of the heat exchange medium within the covered liquid inlet channels 24 is T1, in °C, and the temperature difference between any two adjacent covered liquid inlet channels 24 is δT, in °C, where 10 ≤ T1 ≤ 30, and |δT| ≤ 5.

[0038] According to the battery pack 100 provided in the embodiments of this disclosure, since the heat exchange plate 201 has a plurality of liquid inlet channels 24 that are thermally coupled with the first surface 111 and the second surface 112 of the battery 10, the heat exchange area between the battery 10 and the heat exchange structure 20 is increased and the heat exchange efficiency is improved, while the temperature uniformity of the first surface 111 and the second surface 112 of the battery 10 can also be ensured.

[0039] Furthermore, since the return flow channel 25 is located outside the orthogonal projection of the first surface 111 and the second surface 112 of the battery 10 onto the corresponding heat exchange plate 201, when the heat exchange medium flows from the inlet flow channel 24 to the return flow channel 25, it will no longer be thermally coupled with, or will be less thermally coupled with, the first surface 111 and the second surface 112 of the battery 10. This prevents the heat exchange medium from transferring heat back to the first surface 111 and the second surface 112 of the battery 10. By allowing the heat exchange medium to flow sequentially through the inlet flow channel 24 and the return flow channel 25, and constructing a unidirectional thermal coupling path between the heat exchange medium and the first surface 111 and the second surface 112 of the battery 10, the heat exchange efficiency of the heat exchange structure 20 can be ensured.

[0040] It should be noted that, in the current embodiment, the unidirectional thermal coupling path between the heat transfer medium and the first surface 111 and the second surface 112 of the battery 10 means that heat is transferred only from the first surface 111 and the second surface 112 of the battery 10 to the heat transfer medium. It is understood that, in other embodiments, the unidirectional thermal coupling path between the heat transfer medium and the first surface 111 and the second surface 112 of the battery 10 can also be configured such that heat is transferred only from the heat transfer medium to the first surface 111 and the second surface 112 of the battery 10.

[0041] It should be noted that the temperature testing process described above is as follows: multiple first measurement points are marked on the first surface 111, and multiple second measurement points are marked on the second surface 112. Ten minutes after the coolant is introduced into the heat exchange structure 20, the temperature values ​​of the multiple first measurement points are measured and the average value is taken to obtain T1. The difference between T1 on the first surface 111 of two adjacent batteries 10 is calculated, and the absolute value is taken to obtain |δT|. Alternatively, the temperature values ​​of the multiple second measurement points are measured and the average value is taken to obtain T1. The difference between T1 on the second surface 112 of two adjacent batteries 10 is calculated, and the absolute value is taken to obtain |δT|.

[0042] refer to Figure 2 , Figure 3 and Figure 7 The first surface 111 and the second surface 112 are perpendicular to each other. The first surface 111 is the side of the battery 10 that is perpendicular to the stacking direction of the battery 10, and the second surface 112 is the support surface of the battery 10 that supports the second heat exchange plate 22 in the height direction.

[0043] refer to Figure 3 The area of ​​the second heat exchange plate 22 is larger than that of the first heat exchange plate 21. Since the second heat exchange plate 22 is provided with a return liquid flow channel 25, setting the area of ​​the second heat exchange plate 22 to be larger can ensure the area of ​​the return liquid flow channel 25, ensure the balance of the liquid inlet and liquid outlet rates, and thus improve the circulation efficiency of the heat exchange medium.

[0044] As one possible implementation, the number of inlet channels 24 is greater than the number of return channels 25. This increases the heat exchange area between the first and second surfaces of the battery and the inlet channels 24, thereby improving heat exchange efficiency and ensuring temperature uniformity between the first and second surfaces of the battery.

[0045] refer to Figure 2 The battery pack 100 includes two rows of batteries 10 (not all shown), a first heat exchange plate 21 and a second heat exchange plate 22 perpendicular to each other, each row of batteries 10 arranged along a first direction, and the two rows of batteries 10 separated by the first heat exchange plate 21 in a second direction, the second direction being perpendicular to the first heat exchange plate 21 and the height direction being perpendicular to the second heat exchange plate 22. According to the battery pack 100 provided in the embodiments of this disclosure, one first heat exchange plate 21 can be thermally coupled to two rows of batteries 10, without the need to configure a corresponding heat exchange plate for each row of batteries 10. Therefore, the number of heat exchange plates in the battery pack 100 can be significantly reduced, simplifying the heat exchange structure 20 of the battery pack 100. This not only reduces the manufacturing difficulty of the pipeline of the heat exchange structure 20, but also reduces assembly steps and manufacturing costs.

[0046] It is understood that in this disclosure, directional descriptions such as "top" and "bottom" are relative rather than absolute. These directional descriptions apply when the elements in this disclosure are in the placement posture and position shown in the figures. It should be noted that in the figures of this disclosure, arrows Z+ and Z- are used to indicate opposite sides in the height direction, i.e., the top side and the bottom side; arrows X+ and X- are used to indicate opposite sides in the first direction, which is also the arrangement direction of the plurality of batteries 10; arrows Y+ and Y- are used to indicate opposite sides in the second direction. The height direction, the first direction, and the second direction are perpendicular to each other.

[0047] Continue to refer to Figure 4 The liquid inlet 243 is located on the first heat exchange plate 21. In this way, after the heat exchange medium enters the first heat exchange plate 21, it can flow naturally to the second heat exchange plate 22 under the action of gravity, and the flow of the heat exchange medium can be realized without additional driving force. Therefore, this implementation method can reduce the power requirements of pumps or other driving devices.

[0048] Continue to refer to Figure 4The first heat exchange plate 21 includes a plate body 213 and a first tube body 211. Multiple first liquid inlet channels 241 extend along a first direction. The first tube body 211 is located at one end of the plate body 213. The first tube body 211 is provided with a distribution channel 2111 extending along the height direction. The liquid inlet 243 is located at the top of the first tube body 211 and communicates with the distribution channel 2111. The side of the first tube body 211 facing the plate body 213 is provided with a first connecting port 2112 that connects the distribution channel 2111 with the multiple first liquid inlet channels 241. The bottom of the first tube body 211 is connected to the second heat exchange plate 22 and is provided with a second connecting port 2113 that connects the distribution channel 2111 with the multiple second liquid inlet channels 242. Since the distribution channel 2111 extends along the height direction, and the inlet 243 is located at the top of the first tube 211, the heat exchange medium flows from the inlet 243 into the distribution channel 2111 of the first tube 211 and can flow from the top to the bottom of the first tube 211. A portion of the heat exchange medium enters the first inlet channel 241 through the first connecting port 2112, and another portion enters the second inlet channel 242 through the second connecting port 2113. According to the battery pack 100 provided in this embodiment, the first heat exchange plate 21 and the second heat exchange plate 22 are directly connected through the distribution channel 2111 inside the first tube 211, eliminating the need for cross-plate piping outside the plates, thus achieving the distribution of the heat exchange medium between the first heat exchange plate 21 and the second heat exchange plate 22. This implementation reduces the number of components, lowers the complexity of the flow path, and improves the reliability of the heat exchange structure 20.

[0049] refer to Figure 4 and Figure 6 The second heat exchange plate 22 is further provided with a distribution cavity 221 communicating with the second communication port 2113. Multiple second liquid inlet channels 242 extend along a first direction, with one end of each channel, near the second communication port 2113, communicating with the distribution cavity 221. Since the distribution cavity 221 communicates with the second communication port 2113 at the bottom of the first tube 211, when the heat exchange medium enters the second heat exchange plate 22 through the second communication port 2113, it first enters the distribution cavity 221 and then is evenly distributed from the distribution cavity 221 to the multiple second liquid inlet channels 242. This structural arrangement improves the uniformity of heat exchange medium distribution within the second heat exchange plate 22, thereby enhancing the heat exchange uniformity of the second heat exchange plate 22.

[0050] As one possible implementation, refer to Figure 6The second heat exchange plate 22 is provided with a flow equalization section 222 and a plurality of longitudinal partitions 223. The plurality of longitudinal partitions 223 divide a plurality of second liquid inlet channels 242. The plurality of longitudinal partitions 223 include at least one short partition 2231 and a plurality of long partitions 2232 located on both sides thereof. The flow equalization section 222 extends between the two long partitions 2232 closest to the at least one short partition 2231 to divide the distribution cavity 221 into a first cavity 224 located on the side closest to the at least one short partition 2231 and a second cavity 225 located on the side opposite to the at least one short partition 2231. The flow equalization section 222 is provided with a plurality of flow equalization holes 2221 arranged at intervals along a second direction. Each flow equalization hole 2221 extends from the first cavity 224 to the second cavity 225. In this way, after the heat exchange medium enters the distribution cavity 221, it can be evenly distributed to the first cavity 224 and the second cavity 225, thereby improving the heat exchange uniformity of the second heat exchange plate 22.

[0051] refer to Figure 6 The second cavity 225 includes a narrow region 2251 directly opposite the flow equalization section 222 and two open regions 2252 located on opposite sides of the narrow region 2251 in a second direction. The open regions 2252 on both sides provide buffering and dispersion space for the heat exchange medium in the narrow region 2251, so that the heat exchange medium is more evenly distributed before entering the second liquid inlet channel 242, thereby improving the overall heat exchange uniformity and heat dissipation performance of the second heat exchange plate 22.

[0052] It should be noted that, in the first direction, the size of the narrow region 2251 is smaller than the size of the open region 2252.

[0053] refer to Figure 4 and Figure 6 The return port 251 is only located on the second heat exchange plate 22. By connecting a pipe fitting to the return port 251, a channel for the heat exchange medium to be discharged can be formed. This eliminates the need for a complex irregular structure and can significantly reduce the processing difficulty of the second heat exchange plate 22.

[0054] refer to Figure 6 Multiple second inlet channels 242 extend along a first direction, and two return channels 25 extend along the first direction and are located on opposite sides of the multiple second inlet channels 242 in a second direction. Compared to setting a single return channel 25, constructing two return channels 25 increases the total cross-sectional area of ​​the return flow region, preventing significant abrupt changes in cross-sectional area when the heat exchange medium from the multiple second inlet channels 242 flows into the return channel 25. Therefore, the process of the heat exchange medium flowing into the return channel 25 is smoother and more uniform, without local stagnation, thereby improving the circulation efficiency of the heat exchange medium.

[0055] refer to Figure 6The second heat exchange plate 22 is further provided with a reflux chamber 226 communicating with multiple second inlet channels 242 and two return channels 25. The reflux chamber 226 is located at the same end of the multiple second inlet channels 242 and the two return channels 25 in a first direction. The heat exchange medium flows from the end of the multiple second inlet channels 242 away from the reflux chamber 226 to the end closer to the reflux chamber 226, flows through the reflux chamber 226 into the two return channels 25, and then flows from the end of the two return channels 25 close to the reflux chamber 226 to the end away from the reflux chamber 226. After flowing out of the multiple second inlet channels 242, the heat exchange medium first enters the reflux chamber 226 and then enters the return channels 25. This implementation can ensure that the flow rate of the two return channels 25 is relatively balanced. In addition, the flow path of the heat exchange medium in the reflux chamber 226 is smooth, thus reducing turbulence and local pressure fluctuations, and improving flow stability and circulation efficiency.

[0056] To achieve the connection between multiple first inlet channels 241 and return channels 25, as one possible implementation method, refer to Figure 5 The first heat exchange plate 21 also includes a second tube 212, which is located at one end of the plate 213 near the return cavity 226. The second tube 212 has a tube flow channel 2121 extending along its height. On the side of the second tube 212 facing the plate 213, there is a third connecting port 2122 that connects the tube flow channel 2121 to multiple first liquid inlet channels 241. The bottom of the second tube 212 is connected to the second heat exchange plate 22 and has a fourth connecting port 2123 that connects the tube flow channel 2121 to the return cavity 226. Through the second tube 212, the multiple first liquid inlet channels 241 can connect the return cavity 226 and the return liquid channel 25. According to the battery pack 100 provided in this embodiment, the first heat exchange plate 21 and the second heat exchange plate 22 are directly connected through the tube flow channel 2121 inside the second tube 212, eliminating the need for cross-plate pipes outside the two plates, thus enabling the heat exchange medium to converge from the first heat exchange plate 21 to the second heat exchange plate 22. This implementation reduces the number of components, lowers the complexity of the flow path, and improves the reliability of the heat exchange structure 20.

[0057] refer to Figure 6The second heat exchange plate 22 is provided with two longitudinal partitions 223 and one transverse partition 227. The two longitudinal partitions 223 extend along a first direction and separate the two return liquid channels 25 from the multiple second inlet liquid channels 242. The transverse partition 227 extends between the two ends of the two longitudinal partitions 223 away from the return cavity 226, forming two confluence channels 228 and a merging cavity 229 on the side of the transverse partition 227 away from the return cavity 226. The two confluence channels 228 extend along a second direction from the two return liquid channels 25 to the merging cavity 229, and the merging cavity 229 is connected to the return liquid port 251. By effectively separating the two return liquid channels 25 from the multiple second inlet liquid channels 242, the heat exchange medium in the two return liquid channels 25 can flow evenly to the merging cavity 229 through the confluence channels 228 and finally to the return liquid port 251, realizing the collection of the heat exchange medium.

[0058] refer to Figure 2 and Figure 7 The electrode post 12 is located on the side of each battery 10 facing away from the first heat exchange plate 21. This allows for a smaller distance between the first surface 111 and the second surface 112 of the battery 10 facing away from the electrode post 12 in the second direction and the first heat exchange plate 21, thereby improving the heat exchange efficiency between the first heat exchange plate 21 and the battery 10 and contributing to the temperature uniformity of the battery 10. Furthermore, |δT|≤3. Since the electrode post 12 is located on the side of each battery 10 facing away from the first heat exchange plate 21, the temperature difference between two adjacent first liquid inlet channels 241 in the first heat exchange plate 21 will be reduced.

[0059] refer to Figure 7 The orthogonal projection of the electrode post 12 onto the second heat exchange plate 22 covers a portion of the multiple second liquid inlet channels 242. In this way, the heat generated by the electrode post 12 can be carried away by the heat exchange medium in the second heat exchange plate 22 in a timely manner, avoiding heat accumulation that could cause localized heating of the battery 10 and thus lead to thermal runaway.

[0060] refer to Figure 7 The battery pack 100 also includes a conductive busbar 14 electrically connected to the terminal post 12. The orthogonal projection of the conductive busbar 14 on the second heat exchange plate 22 covers a portion of the multiple second liquid inlet channels 242. In this way, the heat generated by the conductive busbar 14 can be carried away by the heat exchange medium in the second heat exchange plate 22 in a timely manner, avoiding heat accumulation that could cause localized heating of the battery 10 and thus lead to thermal runaway.

[0061] refer to Figure 7The battery pack 100 also includes a third heat exchange plate 23, which is located at the end of the first heat exchange plate 21 facing away from the second heat exchange plate 22 in the height direction, arranged parallel to the second heat exchange plate 22, and covering at least a portion of the two rows of batteries 10. This implementation allows the three battery first surfaces 111 and second surfaces 112 of each battery 10 to be thermally coupled to the first heat exchange plate 21 and the second heat exchange plate 22, thereby increasing the heat exchange area and heat exchange efficiency of the battery 10, and enabling the heat generated by the battery 10 to be transferred to the first heat exchange plate 21 and the second heat exchange plate 22 more quickly and evenly. Especially under high-rate charge-discharge or rapid cycling conditions, this implementation can suppress the local temperature rise of the battery 10, reduce the risk of thermal runaway caused by overheating, and thus improve the safety and operational reliability of the battery pack 100.

[0062] As one possible implementation, multiple heat exchange structures 20 are stacked along the height direction, with each heat exchange structure 20 having two corresponding rows of batteries 10. By thermally coupling one heat exchange structure 20 with two rows of batteries 10 located at different heights, the number of heat exchange structures 20 can be reduced, simplifying the heat exchange structures 20 of the battery pack 100. This not only reduces the manufacturing difficulty of the piping of the heat exchange structure 20, but also reduces assembly steps and manufacturing costs.

[0063] refer to Figure 7 The first heat exchange plate 21 and the second heat exchange plate 22 are fixedly connected. By fixing the first heat exchange plate 21 and the second heat exchange plate 22 together, they form a mutually supporting integral structure, which significantly enhances the overall rigidity of the heat exchange structure 20, thereby improving its resistance to deformation under external forces. Furthermore, the fixed connection of the first heat exchange plate 21 and the second heat exchange plate 22 also keeps the liquid inlet channel 24 fixed relative to the battery 10, ensuring that the flow path of the heat exchange medium is not affected by external forces, thus ensuring the heat exchange effect and operational reliability of the heat exchange structure 20.

[0064] refer to Figure 2 The battery pack 100 also includes two panels 31, which are fixedly connected to both ends of the second heat exchange plate 22. The second heat exchange plate 22 not only bears and supports the weight of the battery 10, but also has close thermal coupling with the battery 10. This implementation achieves both mechanical support and thermal management functions of the battery 10 with a single component, thereby reducing the number of components in the battery pack 100 and contributing to its lightweight design. Furthermore, the fixed connection between the panels 31 and the second heat exchange plate 22 enhances the rigidity and stability of the overall structure, improving the battery pack 100's resistance to deformation under external forces, vibrations, or impacts.

[0065] refer to Figure 2The battery pack 100 also includes two first crossbeams 41, which are located at opposite ends of the two rows of batteries 10 in a first direction. Each first crossbeam 41 includes two first beam bodies 411, which are located at opposite ends of the first heat exchange plate 21 in a second direction and are fixedly connected to the second heat exchange plate 22, clamping the first heat exchange plate 21 between them. The fixed connection between the two first crossbeams 41 and the second heat exchange plate 22 can enhance the rigidity and stability of the overall structure and improve the deformation resistance of the battery pack 100 under external forces, vibrations, or impacts. In addition, the clamping of the first heat exchange plate 21 by the two first crossbeams 41 can also improve the structural stability of the first heat exchange plate 21, ensure that the position of the liquid inlet channel 24 relative to the battery 10 is fixed, and thus ensure the heat exchange effect and operational reliability of the heat exchange structure 20.

[0066] refer to Figure 2 The battery pack 100 also includes a second crossbeam 42. Each battery pack 100 includes two battery sections 10 located on opposite sides of the second crossbeam 42 along a first direction. Each second crossbeam 42 includes two second beam bodies 421 located at opposite ends of the first heat exchange plate 21 in a second direction, fixedly connected to the second heat exchange plate 22, and clamping the first heat exchange plate 21 between them. The fixed connection between the second crossbeam 42 and the second heat exchange plate 22 can further enhance the rigidity and stability of the overall structure and improve the deformation resistance of the battery pack 100 under external forces, vibrations, or impacts. In addition, the clamping of the first heat exchange plate 21 by the two second beam bodies 421 of the second crossbeam 42 can also improve the structural stability of the first heat exchange plate 21, ensure that the position of the liquid inlet channel 24 relative to the battery 10 is fixed, and thus ensure the heat exchange effect and operational reliability of the heat exchange structure 20.

[0067] <Example Electrical Equipment> refer to Figure 8 This disclosure provides an electrical device 200, which includes a battery pack 100.

[0068] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0069] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0070] In a non-restrictive example, refer to Figure 8 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.

[0071] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0072] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0073] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as the first heat exchange plate and the second heat exchange plate), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0074] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0075] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack (100), characterized in that, include: The battery (10) has a first surface (111) and a second surface (112) disposed adjacent to each other; as well as The heat exchange structure (20) includes a first heat exchange plate (21) and a second heat exchange plate (22) that are heat-coupled to the first surface (111) and the second surface (112) respectively. The first heat exchange plate (21) is provided with a liquid inlet (243), which connects to a plurality of first liquid inlet channels (241) on the first heat exchange plate (21) and a plurality of second liquid inlet channels (242) on the second heat exchange plate (22). The plurality of first liquid inlet channels (241) and the plurality of second liquid inlet channels (242) are collectively referred to as a plurality of liquid inlet channels (24). The second heat exchange plate (22) is provided with a liquid return port (251) and a liquid return channel (25). The medium flows through the plurality of second inlet channels (242) to the return channel (25) and flows out through the return port (251); wherein, the orthographic projection of the first surface (111) and the second surface (112) on the corresponding heat exchange plate covers at least two inlet channels (24), the return channel (25) is located outside the orthographic projection of the first surface (111) and the second surface (112) on the corresponding heat exchange plate, the temperature of the heat exchange medium in the covered inlet channel (24) is T1, in °C, the temperature difference between two adjacent covered inlet channels (24) is δT, in °C, 10≤T1≤30, |δT|≤5.

2. The battery pack (100) according to claim 1, characterized in that, The first surface (111) and the second surface (112) are perpendicular to each other, and the second surface (112) is the support surface on which the battery (10) is supported in the height direction by the second heat exchange plate (22).

3. The battery pack (100) according to claim 2, characterized in that, The area of ​​the second heat exchange plate (22) is larger than the area of ​​the first heat exchange plate (21).

4. The battery pack (100) according to claim 2, characterized in that, The first surface (111) is the side of the battery (10) that is perpendicular to the arrangement direction of the battery (10) and the height direction.

5. The battery pack (100) according to claim 1, characterized in that, The number of inlet channels (24) is greater than the number of return channels (25).

6. The battery pack (100) according to claim 1, characterized in that, The plurality of first inlet channels (241) and the return channel (25) are connected.

7. The battery pack (100) according to claim 1, characterized in that, The battery (10) includes two rows of batteries, the first heat exchange plate (21) and the second heat exchange plate (22) are perpendicular to each other, each row of batteries (10) is arranged along a first direction, the two rows of batteries (10) are separated by the first heat exchange plate (21) in a second direction, the first direction, the second direction and the height direction are perpendicular to each other, the second direction is perpendicular to the first heat exchange plate (21) and the height direction is perpendicular to the second heat exchange plate (22).

8. The battery pack (100) according to claim 7, characterized in that, The first heat exchange plate (21) includes a plate body (213) and a first tube body (211). The plurality of first liquid inlet channels (241) extend along the first direction. The first tube body (211) is located at one end of the plate body (213). The first tube body (211) is provided with a distribution channel (2111) extending along the height direction. The liquid inlet (243) is located at the top of the first tube body (211) and communicates with the distribution channel (2111). The first tube body (211) is provided with a first connecting port (2112) on the side facing the plate body (213) to connect the distribution channel (2111) with the plurality of first liquid inlet channels (241). The bottom of the first tube body (211) is connected to the second heat exchange plate (22) and is provided with a second connecting port (2113) to connect the distribution channel (2111) with the plurality of second liquid inlet channels (242).

9. The battery pack (100) according to claim 8, characterized in that, The second heat exchange plate (22) is also provided with a distribution cavity (221) that communicates with the second communication port (2113). The plurality of second liquid inlet channels (242) extend along the first direction and one end of them that is close to the second communication port (2113) in the first direction communicates with the distribution cavity (221).

10. The battery pack (100) according to claim 9, characterized in that, The second heat exchange plate (22) is provided with a flow equalization section (222) and a plurality of longitudinal partitions (223). The plurality of longitudinal partitions (223) separate the plurality of second liquid inlet channels (242). The plurality of longitudinal partitions (223) include at least one short partition (2231) and a plurality of long partitions (2232) located on both sides thereof. The flow equalization section (222) extends between the two long partitions (2232) closest to the at least one short partition (2231) to divide the distribution cavity (221) into a first cavity (224) located on the side close to the at least one short partition (2231) and a second cavity (225) located on the side opposite to the at least one short partition (2231). The flow equalization section (222) is provided with a plurality of flow equalization holes (2221) arranged at intervals along the second direction. Each flow equalization hole (2221) extends from the first cavity (224) to the second cavity (225).

11. The battery pack (100) according to claim 10, characterized in that, The second cavity (225) includes a narrow region (2251) directly opposite the flow equalization section (222) and two open regions (2252) located on opposite sides of the narrow region (2251) in the second direction.

12. The battery pack (100) according to claim 1, characterized in that, The return port (251) is only located on the second heat exchange plate (22).

13. The battery pack (100) according to claim 12, characterized in that, The plurality of second inlet channels (242) extend along a first direction, and two return channels (25) extend along the first direction and are respectively located on opposite sides of the plurality of second inlet channels (242) in the second direction.

14. The battery pack (100) according to claim 13, characterized in that, The second heat exchange plate (22) is also provided with a reflux cavity (226) that communicates with the plurality of second liquid inlet channels (242) and the two liquid return channels (25). The reflux cavity (226) is located at the same end of the plurality of second liquid inlet channels (242) and the two liquid return channels (25) in the first direction. The heat exchange medium flows from the end of the plurality of second liquid inlet channels (242) away from the reflux cavity (226) to the end close to the reflux cavity (226), flows into the two liquid return channels (25) through the reflux cavity (226), and flows from the end of the two liquid return channels (25) close to the reflux cavity (226) to the end away from the reflux cavity (226).

15. The battery pack (100) according to claim 14, characterized in that, The first heat exchange plate (21) includes a plate body (213) and a second tube body (212). The plurality of first liquid inlet channels (241) are disposed in the plate body (213) and extend along the first direction. The second tube body (212) is disposed at one end of the plate body (213) near the return cavity (226). The second tube body (212) is provided with a tube body channel (2121) extending along the height direction. The height is perpendicular to the first direction. The side of the second tube body (212) facing the plate body (213) is provided with a third communication port (2122) that connects the tube body channel (2121) with the plurality of first liquid inlet channels (241). The bottom of the second tube body (212) is connected to the second heat exchange plate (22) and is provided with a fourth communication port (2123) that connects the tube body channel (2121) with the return cavity (226).

16. The battery pack (100) according to claim 14 or 15, characterized in that, The second heat exchange plate (22) is provided with two longitudinal partitions (223) and one transverse partition (227). The two longitudinal partitions (223) extend along the first direction and separate the two return liquid channels (25) from the plurality of second inlet liquid channels (242). The transverse partition (227) extends between the two ends of the two longitudinal partitions (223) away from the return cavity (226) to form two confluence channels (228) and a merging cavity (229) on the side of the transverse partition (227) away from the return cavity (226). The two confluence channels (228) extend along the second direction from the two return liquid channels (25) to the merging cavity (229). The merging cavity (229) is connected to the return liquid port (251).

17. The battery pack (100) according to claim 7, characterized in that, The plurality of first liquid inlet channels (241) are arranged side by side in the first heat exchange plate (21) along the height direction, the plurality of second liquid inlet channels (242) are arranged side by side in the second heat exchange plate (22) along the second direction, and two liquid return channels (25) are arranged in the second heat exchange plate (22), the two liquid return channels (25) being located on opposite sides of the plurality of second liquid inlet channels (242) in the second direction.

18. The battery pack (100) according to claim 17, characterized in that, Each battery (10) has a terminal post (12) on the side opposite to the first heat exchange plate (21).

19. The battery pack (100) according to claim 18, characterized in that, |δT|≤3.

20. The battery pack (100) according to claim 18, characterized in that, The orthographic projection of the pole post (12) onto the second heat exchange plate (22) covers a portion of the plurality of second liquid inlet channels (242).

21. The battery pack (100) according to claim 18, characterized in that, It also includes a conductive bus (14) electrically connected to the pole (12), the orthographic projection of the conductive bus (14) on the second heat exchange plate (22) covering a portion of the plurality of second liquid inlet channels (242).

22. The battery pack (100) according to claim 17, characterized in that, It also includes a third heat exchange plate (23), which is located at one end of the first heat exchange plate (21) away from the second heat exchange plate (22) in the height direction, is arranged parallel to the second heat exchange plate (22), and covers at least a portion of the two rows of batteries (10).

23. The battery pack (100) according to claim 17, characterized in that, Multiple heat exchange structures (20) are stacked along the height direction, and each heat exchange structure (20) is provided with the corresponding two rows of batteries (10).

24. The battery pack (100) according to claim 7, characterized in that, The first heat exchange plate (21) and the second heat exchange plate (22) are fixedly connected.

25. The battery pack (100) according to claim 24, characterized in that, It also includes two boxes (31), which are fixedly connected to both ends of the second heat exchange plate (22).

26. The battery pack (100) according to claim 25, characterized in that, It also includes two first crossbeams (41), which are located at opposite ends of the two rows of batteries (10) in the first direction. Each first crossbeam (41) includes two first beam bodies (411), which are located at opposite ends of the first heat exchange plate (21) in the second direction, and are fixedly connected to the second heat exchange plate (22) and clamp the first heat exchange plate (21) between them.

27. The battery pack (100) according to claim 26, characterized in that, It also includes a second crossbeam (42), each row of batteries (10) includes two battery groups (10) located on opposite sides of the second crossbeam (42) along the first direction, each second crossbeam (42) includes two second beam bodies (421), the two second beam bodies (421) are located at opposite ends of the first heat exchange plate (21) in the second direction, are fixedly connected to the second heat exchange plate (22) and clamp the first heat exchange plate (21) between them.

28. An electrical appliance (200), characterized in that, Includes the battery pack (100) according to any one of claims 1 to 27.

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