Liquid cooling plate, battery pack and vehicle

Abstract

The utility model provides a liquid cooling plate, a battery pack and a vehicle. The liquid cooling plate comprises a liquid cooling plate body, a plurality of runner cavities for circulating a cooling medium are formed in the liquid cooling plate body and extend in the length direction of the liquid cooling plate body; in the height direction of the liquid cooling plate body, the thickness size of the flow channel cavity close to the middle area of the liquid cooling plate body is smaller than that of the flow channel cavity close to the edge area of the liquid cooling plate body, and the liquid cooling plate body can provide a certain expansion space for the large surface of the battery monomer by changing the thickness size of the flow channel cavity; the obstruction degree of the liquid cooling plate to the expansion of the battery monomer is reduced, so that the overpressure condition of the large surface of the battery monomer is avoided, and the heat dissipation effect of the liquid cooling plate to the battery monomer and the charge-discharge capability of the battery monomer are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cell heat dissipation, in particular to a liquid cooling plate, a battery pack and a vehicle. Background Art

[0002] During the charge and discharge process of battery cells in a power battery pack, a large amount of heat is generated, causing the temperature inside the battery pack to rise. If the temperature inside the battery pack is too high, it will lead to a decline in the charge and discharge capacity of the battery cells, and even thermal runaway may occur, resulting in the battery pack catching fire and exploding. Therefore, a liquid cooling plate is usually provided inside the battery pack to dissipate heat from the battery cells, so as to maintain the temperature inside the battery pack within the normal range and ensure the normal operation of the battery pack.

[0003] Currently, the heat dissipation of battery cells by the liquid cooling plate mainly adopts the bottom cooling method. With the widespread use of fast-charging battery packs, the power of battery cells increases, and the heat generation also increases significantly. The traditional bottom cooling cannot effectively meet the heat dissipation requirements of high-power battery cells. Therefore, in some fast-charging battery packs, a liquid cooling plate is arranged between the large surfaces of the battery cells to increase the heat dissipation effect on the battery cells.

[0004] However, since the large surfaces of the battery cells expand during the charge and discharge process, the arrangement of the liquid cooling plate will hinder the expansion of the battery cells, easily causing overpressure on the large surfaces of the battery cells, and further affecting the heat dissipation capacity and charge and discharge capacity of the battery cells. Summary of the Utility Model

[0005] In view of this, the utility model aims to propose a liquid cooling plate, a battery pack and a vehicle to at least solve the problem that the liquid cooling plate in the prior art easily hinders the expansion of battery cells and affects the heat dissipation effect and charge and discharge capacity of battery cells.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] A liquid cooling plate includes a liquid cooling plate body; a plurality of flow channels for circulating a cooling medium are arranged in the liquid cooling plate body, and the plurality of flow channels are arranged along the length direction of the liquid cooling plate body; along the height direction of the liquid cooling plate body, the thickness dimension of the flow channel near the middle area of the liquid cooling plate body is smaller than the thickness dimension of the flow channel near the edge area of the liquid cooling plate body.

[0008] Furthermore, the liquid cooling plate body includes a first plate body and a second plate body connected to each other, and a plurality of the flow channels are formed between the first plate body and the second plate body.

[0009] Further, a plurality of first recessed cavities are provided on the first plate body at intervals, and a plurality of second recessed cavities are provided on the second plate body at intervals; the first recessed cavities and the second recessed cavities correspond to each other one by one, and a flow channel cavity is formed between the first recessed cavities and the second recessed cavities.

[0010] Further, a first heat-conducting medium is coated on a side of the first plate body facing away from the second plate body, and a second heat-conducting medium is coated on a side of the second plate body facing away from the first plate body.

[0011] Further, along the height direction of the liquid cooling plate body, the thickness dimension of the first heat-conducting medium near the middle region of the liquid cooling plate body is greater than the thickness dimension of the first heat-conducting medium near the edge region of the liquid cooling plate body; and / or, along the height direction of the liquid cooling plate body, the thickness dimension of the second heat-conducting medium near the middle region of the liquid cooling plate body is greater than the thickness dimension of the second heat-conducting medium near the edge region of the liquid cooling plate body.

[0012] Further, the liquid cooling plate body further includes a third plate body, and the third plate body is disposed between the first plate body and the second plate body; through holes are provided on the third plate body, and the through holes are disposed between the first recessed cavities and the second recessed cavities.

[0013] Further, the first recessed cavities and the second recessed cavities are symmetric with each other along the third plate body.

[0014] Further, along the length direction of the liquid cooling plate body, the thickness dimension of the flow channel cavity near the middle region of the liquid cooling plate body is smaller than the thickness dimension of the flow channel cavity near the edge region of the liquid cooling plate body.

[0015] Further, the liquid cooling plate further includes a pipe joint, and the pipe joint is connected to the edge region of the liquid cooling plate body, and the pipe joint communicates with the flow channel cavity.

[0016] Further, the pipe joint includes a first liquid inlet joint, a first liquid outlet joint, a second liquid inlet joint, and a second liquid outlet joint; a part of the plurality of flow channel cavities communicate with each other to form a first flow channel structure, and another part communicate with each other to form a second flow channel structure; one end of the first flow channel structure communicates with the first liquid inlet joint, and the other end communicates with the first liquid outlet joint; one end of the second flow channel structure communicates with the second liquid inlet joint, and the other end communicates with the second liquid outlet joint.

[0017] The present utility model further provides a battery pack, including the liquid cooling plate described in any one of the foregoing items.

[0018] Further, it further includes a plurality of battery cells; the plurality of battery cells are arranged in a straight line and stacked, the liquid cooling plate is disposed in the gap between adjacent battery cells, and the liquid cooling plate abuts against the largest surface of the battery cell.

[0019] The present utility model further provides a vehicle, including the aforementioned battery pack.

[0020] Compared with the prior art, the liquid cooling plate of the present utility model has the following advantages:

[0021] In the liquid cooling plate of the present utility model, along the height direction of the liquid cooling plate body, the thickness dimension of the flow channel cavity near the middle region of the liquid cooling plate body is smaller than the thickness dimension of the flow channel cavity near the edge region of the liquid cooling plate body. By changing the thickness dimension of the flow channel cavity, the liquid cooling plate body can provide a certain expansion space for the large surface of the battery cell, reduce the obstruction degree of the liquid cooling plate to the expansion of the battery cell, thereby avoiding the overpressure situation on the large surface of the battery cell, and ensuring the heat dissipation effect of the liquid cooling plate on the battery cell and the charge and discharge capacity of the battery cell.

[0022] The battery pack and the vehicle of the present utility model have the same or similar advantages as the aforementioned liquid cooling plate compared with the prior art, and will not be elaborated herein. Description of the Drawings

[0023] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0024] Figure 1 is a schematic diagram of the liquid cooling plate according to an embodiment of the present utility model;

[0025] Figure 2 is a front view of the liquid cooling plate according to an embodiment of the present utility model;

[0026] Figure 3 is a side sectional view of the liquid cooling plate body according to an embodiment of the present utility model;

[0027] Figure 4 is a partial side sectional view of the liquid cooling plate according to an embodiment of the present utility model;

[0028] Figure 5 is a schematic diagram of the inside of the battery pack according to an embodiment of the present utility model.

[0029] Description of the Reference Numerals:

[0030] 1 - Liquid cooling plate body, 10 - Flow channel cavity, 101 - First flow channel structure, 102 - Second flow channel structure, 11 - First plate body, 12 - Second plate body, 110 - First concave cavity, 120 - Second concave cavity, 13 - Third plate body, 130 - Through hole, 2 - Pipe joint, 21 - First liquid inlet joint, 22 - First liquid outlet joint, 23 - Second liquid inlet joint, 24 - Liquid outlet joint, 3 - Battery cell. Detailed implementation mode

[0031] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0032] The terms "first", "second", etc. in the specification and claims of the present invention are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0033] It should be understood that "some embodiments" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the present invention. Therefore, "in some embodiments" appearing throughout the specification does not necessarily refer to the same embodiments. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0034] The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] Refer to Figure 1 、 Figure 2 and Figure 5 , a liquid cooling plate provided by an embodiment of the present invention includes a liquid cooling plate body 1; a plurality of flow channel cavities 10 for circulating a cooling medium are provided in the liquid cooling plate body 1, and the plurality of flow channel cavities 10 are arranged along the length direction of the liquid cooling plate body 1; along the height direction of the liquid cooling plate body 1, the thickness dimension of the flow channel cavity 10 near the middle area of the liquid cooling plate body 1 is smaller than the thickness dimension of the flow channel cavity 10 near the edge area of the liquid cooling plate body 1.

[0036] Specifically, the liquid cooling plate of the embodiment of the present utility model can be applied in a fast charging battery pack, and is arranged between the large surfaces of two adjacent battery cells to cool and dissipate heat from the large surfaces of the battery cells, thereby improving the cooling and heat dissipation effect of the battery cells, meeting the heat dissipation requirements of high-power battery cells, and keeping the temperature inside the battery pack within a reasonable range. The liquid cooling plate body 1 is the main part of the liquid cooling plate. The liquid cooling plate body 1 can be made of plates with good strength and stiffness such as copper plates, aluminum plates, stainless steel plates, composite material plates, etc., and at the same time has good heat resistance, thermal conductivity, corrosion resistance, etc., and can achieve long-term and effective cooling and heat dissipation effects.

[0037] Specifically, as Figure 1 shown, a plurality of flow channel cavities 10 extending along the length direction of the liquid cooling plate body 1 are arranged in the liquid cooling plate body 1. A cooling medium flows in the flow channel cavities 10. The cooling and heat dissipation of the liquid cooling plate body 1 is essentially realized by the cooling medium inside it. During the flow of the cooling medium, the heat generated during the charging and discharging process of the battery cells can be absorbed and carried out of the battery pack. Among them, the cooling medium can be pure water, ethylene glycol aqueous solution, etc., and the specific type is not limited in this embodiment. The length direction of the liquid cooling plate body 1 is as Figure 1 and Figure 2 shown by the X direction in. A plurality of flow channel cavities 10 extend and are arranged along the X direction. The adjacent flow channel cavities 10 are connected to each other at both ends in the X direction to form a flow channel structure arranged in an "S" shape in a meandering manner. The specific number of the flow channel cavities 10 can be set according to the size of the liquid cooling plate body 1 and the heat dissipation requirements of the battery cells. If the size of the liquid cooling plate body 1 is large and the heat dissipation requirements of the battery cells are high, the number of the flow channel cavities 10 can be set to be large. If the size of the liquid cooling plate body 1 is small and the heat dissipation requirements of the battery cells are low, the number of the flow channel cavities 10 can be set to be small. The specific number is not limited in this embodiment.

[0038] Along the height direction of the liquid cooling plate body 1, the height direction of the liquid cooling plate body 1 is as Figure 1 and Figure 2 shown by the Z direction in. Along the Z direction, the thickness dimension of the flow channel cavity 10 near the middle area of the liquid cooling plate body 1 is smaller than the thickness dimension of the flow channel cavity 10 near the edge area of the liquid cooling plate body 1. As Figure 3 shows a side sectional view of the liquid cooling plate body 1. The thickness direction of the liquid cooling plate body 1 is as Figure 3 shown by the Y direction in. As Figure 3 shown, the dimension of the flow channel cavity 10 along the Y direction near the middle area of the liquid cooling plate body 1 is smaller than the dimension of the flow channel cavity 10 along the Y direction near the edge area of the liquid cooling plate body 1. As Figure 5As shown, during the charging and discharging process of the battery cell 3, when it expands, the central region of the large surface of the battery cell 3 expands to a greater extent, while the edge region of the large surface of the battery cell 3 expands to a smaller extent. Figure 5 The direction of the arrow in Figure 5 shows the direction in which the battery cell 3 expands. The central region of the large surface of the battery cell 3 corresponds to the central region of the liquid cooling plate body 1, and the edge region of the large surface of the battery cell 3 corresponds to the edge region of the liquid cooling plate body 1. Thus, the thickness dimension of the flow channel cavity 10 near the middle region of the liquid cooling plate body 1 along the Z direction is smaller than the thickness dimension of the flow channel cavity 10 near the edge region of the liquid cooling plate body 1, which can provide a certain expansion space for the large surface of the battery cell 3, reduce the degree of obstruction of the liquid cooling plate to the expansion of the battery cell 3, thereby avoiding overpressure on the large surface of the battery cell 3 and ensuring the heat dissipation effect of the liquid cooling plate on the battery cell 3 and the charge and discharge capacity of the battery cell 3.

[0039] Furthermore, in some embodiments, it is also possible to set that along the length direction of the liquid cooling plate body 1, the thickness dimension of the flow channel cavity 10 near the middle region of the liquid cooling plate body 1 is smaller than the thickness dimension of the flow channel cavity 10 near the edge region of the liquid cooling plate body 1, that is, along the X direction, the thickness dimension of the flow channel cavity 10 near the middle region of the liquid cooling plate body 1 is smaller than the thickness dimension of the flow channel cavity 10 near the edge region of the liquid cooling plate body 1, so as to better adapt to the expansion of the large surface of the battery cell 3.

[0040] Furthermore, referring to Figure 3 , in some embodiments, the liquid cooling plate body 1 includes a first plate body 11 and a second plate body 12. The first plate body 11 and the second plate body 12 are stacked and connected to each other. The first plate body 11 and the second plate body 12 can be connected together by means such as laser welding, adhesive connection, fastener assembly connection, and clamping. The specific connection method is not limited in this embodiment. In addition, the first plate body 11 and the second plate body 12 can be made of plates with the same material to ensure uniform stress on both sides of the liquid cooling plate body 1 and improve the structural stability of the liquid cooling plate body 1. A plurality of flow channel cavities 10 are formed between the first plate body 11 and the second plate body 12. To avoid leakage of the cooling medium in the flow channel cavities 10, a sealing member made of materials such as silica gel, rubber, plastic, and foam can be provided between the first plate body 11 and the second plate body 12 to seal the gap between the first plate body 11 and the second plate body 12.

[0041] Furthermore, referring to Figure 3 , in some embodiments, the first plate body 11 is provided with a plurality of first recessed cavities 110 arranged at intervals, and the second plate body 12 is provided with a plurality of second recessed cavities 120 arranged at intervals; the first recessed cavities 110 and the second recessed cavities 120 correspond one by one, and the flow channel cavities 10 are formed between the first recessed cavities 110 and the second recessed cavities 120.

[0042] Specifically, the first plate body 11 can form a plurality of first concave cavities 110 arranged at intervals by stamping, and the second plate body 12 can form a plurality of second concave cavities 120 arranged at intervals by stamping. The number of the first concave cavities 110 is the same as that of the second concave cavities 120 and they correspond to each other one by one. A flow channel cavity 10 is formed between each first concave cavity 110 and each second concave cavity 120. Thus, a plurality of flow channel cavities 10 are formed between the plurality of first concave cavities 110 and the plurality of second concave cavities 120. Figure 3 The embodiment in which eight flow channel cavities 10 are formed between eight first concave cavities 110 and eight second concave cavities 120 is shown. The specific number of the first concave cavities 110 and the second concave cavities 120 can be set according to the size of the liquid cooling plate body 1 and the heat dissipation requirements of the battery cell 3, and this embodiment does not limit this.

[0043] The thickness dimension of the flow channel cavity 10 refers to the sum of the thickness dimensions of the first concave cavity 110 and the second concave cavity 120. In this embodiment, along the height direction of the liquid cooling plate body 1, that is, along the Figure 3 Z direction in [the figure], the thickness dimension of the first concave cavity 110 near the middle area of the liquid cooling plate body 1 is set to be smaller than the thickness dimension of the first concave cavity 110 near the edge area of the liquid cooling plate body 1, and the thickness dimension of the second concave cavity 120 near the middle area of the liquid cooling plate body 1 is set to be smaller than the thickness dimension of the second concave cavity 120 near the edge area of the liquid cooling plate body 1, so as to ensure uniform force on both sides of the liquid cooling plate body 1 and improve the structural stability of the liquid cooling plate body 1.

[0044] Further, in some embodiments, a first heat-conducting medium is coated on the side of the first plate body 11 facing away from the second plate body 12, and a second heat-conducting medium is coated on the side of the second plate body 12 facing away from the first plate body 11. The first heat-conducting medium and the second heat-conducting medium can adopt heat-conducting glue. Heat-conducting glue is an adhesive with heat-conducting performance, which can closely adhere between the first plate body 11 and the battery cell 3 and between the second plate body 12 and the battery cell 3 to form an effective heat conduction path, thereby further improving the cooling and heat dissipation effect of the liquid cooling plate on the battery cell 3. Both the first heat-conducting medium and the second heat-conducting medium have good insulation performance and temperature resistance performance, can achieve electrical insulation between the first plate body 11 and the battery cell 3 and between the second plate body 12 and the battery cell 3, avoid the short-circuit phenomenon of the battery cell 3, and at the same time can meet the requirements of the working environment of the battery cell 3 to ensure that the battery cell 3 can still work normally under high-temperature or low-temperature conditions. In addition, the first heat-conducting medium and the second heat-conducting medium have compressible performance. During the expansion process of the battery cell 3, the large surface of the battery cell 3 extrudes the first heat-conducting medium and the second heat-conducting medium, causing the first heat-conducting medium and the second heat-conducting medium to undergo compressive deformation to adapt to the expansion of the battery cell 3.

[0045] Further, in some embodiments, along the height direction of the liquid cooling plate body 1, the thickness dimension of the first heat-conducting medium near the middle area of the liquid cooling plate body 1 is greater than the thickness dimension of the first heat-conducting medium near the edge area of the liquid cooling plate body 1, so that the first heat-conducting medium can effectively adapt to the expansion of the large surface of the battery cell 3. Or, along the height direction of the liquid cooling plate body 1, the thickness dimension of the second heat-conducting medium near the middle area of the liquid cooling plate body 1 is greater than the thickness dimension of the second heat-conducting medium near the edge area of the liquid cooling plate body 1, so that the first heat-conducting medium can effectively adapt to the expansion of the large surface of the battery cell 3. Or, both the thickness dimension of the first heat-conducting medium near the middle area of the liquid cooling plate body 1 is set to be greater than the thickness dimension of the first heat-conducting medium near the edge area of the liquid cooling plate body 1, and the thickness dimension of the second heat-conducting medium near the middle area of the liquid cooling plate body 1 is set to be greater than the thickness dimension of the second heat-conducting medium near the edge area of the liquid cooling plate body 1, so that both sides of the liquid cooling plate body 1 can effectively adapt to the expansion of the large surface of the battery cell 3.

[0046] Further, referring to Figure 3 and Figure 4 , in some embodiments, the liquid cooling plate body 1 further includes a third plate body 13, and the third plate body 13 is disposed between the first plate body 11 and the second plate body 12; through holes 130 are provided on the third plate body 13, and the through holes 130 are disposed between the first concave cavity 110 and the second concave cavity 120.

[0047] Specifically, the third plate body 13 is a flat plate-like structure. The third plate body 13 is disposed between the first plate body 11 and the second plate body 12. The first plate body 11, the second plate body 12, and the third plate body 13 can be connected together by means of laser welding, adhesive bonding, fastener assembly connection, snap connection, etc. The specific connection method is not limited in this embodiment. The third plate body 13 can enhance the structural stability of the liquid cooling plate body 1 to a certain extent and avoid deformation, damage, etc. of the liquid cooling plate body 1 caused by the expansion effect of the battery cell 3.

[0048] Through holes 130 are provided on the third plate body 13. The through holes 130 are disposed between the first concave cavity 110 and the second concave cavity 120. The first concave cavity 110 and the second concave cavity 120 can be communicated with each other through the through holes 130. The through holes 130 can be any shape structure such as circular holes, square holes, oval holes, etc. The size of the through holes 130 is set according to the volumes of the first concave cavity 110 and the second concave cavity 120. If the volumes of the first concave cavity 110 and the second concave cavity 120 are large, the size of the through holes 130 is set to be large to ensure the effective circulation of the cooling medium in the first concave cavity 110 and the second concave cavity 120. If the volumes of the first concave cavity 110 and the second concave cavity 120 are small, the size of the through holes 130 is set to be small to maintain the strength and stiffness of the third plate and improve the structural stability of the liquid cooling plate body 1.

[0049] Further, referring to Figure 3 and Figure 4 , in some embodiments, the first recessed cavity 110 and the second recessed cavity 120 are symmetric with respect to the third plate body 13, so as to improve the uniformity of the flow of the cooling medium in the flow channel cavity 10, thereby contributing to the uniform heat dissipation of the liquid cooling plate body 1.

[0050] Further, referring to Figure 3 , in some embodiments, the first recessed cavity 110 and the second recessed cavity 120 can be set as arc-shaped cavities. The arc-shaped cavities can reduce the dead corner areas during the flow of the cooling medium, thereby contributing to the smooth flow of the cooling medium. Alternatively, at least part of the plurality of first recessed cavities 110 and at least part of the plurality of second recessed cavities 120 can be set as arc-shaped cavities. Exemplarily, since the edge area of the liquid cooling plate body 1 is less affected by the expansion of the battery cell 3 and the flow rate of the flow channel cavity 10 in the edge area is large, the flow channel cavity 10 near the edge area of the liquid cooling plate body 1 can be set as an arc-shaped cavity to ensure the smooth flow of the cooling medium.

[0051] Further, referring to Figure 1 , Figure 2 and Figure 4 , in some embodiments, the liquid cooling plate further includes a pipe joint 2. The pipe joint 2 is connected to the edge area of the liquid cooling plate body 1, and the pipe joint 2 is in communication with the flow channel cavity 10.

[0052] Specifically, the pipe joint 2 is fixedly connected to the liquid cooling plate body 1 and is in communication with the flow channel cavity 10 in the liquid cooling plate body 1. The pipe joint 2 forms the liquid inlet and outlet of the flow channel cavity 10. Figure 1 and Figure 2 show an embodiment in which the liquid cooling plate includes four pipe joints 2. The fixed connection between the pipe joint 2 and the liquid cooling plate body 1 can adopt methods such as laser welding, adhesive bonding, and fastener assembly connection. To avoid liquid leakage at the connection part between the pipe joint 2 and the liquid cooling plate body 1, a sealing member made of materials such as silica gel, rubber, plastic, and foam can be provided at the connection part between the pipe joint 2 and the liquid cooling plate body 1 to seal the gap at the connection part.

[0053] Further, referring to Figure 1 and Figure 2, in some embodiments, the pipe joint 2 includes a first liquid inlet joint 21, a first liquid outlet joint 22, a second liquid inlet joint 23, and a second liquid outlet joint 24. Among them, the first liquid inlet joint 21 and the second liquid inlet joint 23 are used to inject low-temperature coolant into the flow channel cavity 10 in the liquid cooling plate body 1, and the first liquid outlet joint 22 and the second liquid outlet joint 24 are used for the high-temperature coolant after absorbing heat in the flow channel cavity 10 to be discharged. A part of the multiple flow channel cavities 10 communicate with each other to form a first flow channel structure 101, and another part communicate with each other to form a second flow channel structure 102. Among them, the first flow channel structure 101 is located in the central area of the liquid cooling plate body 1, and the second flow channel structure 102 is located in the edge area of the liquid cooling plate body 1.

[0054] One end of the first flow channel structure 101 communicates with the first liquid inlet joint 21, and the other end communicates with the first liquid outlet joint 22. One end of the second flow channel structure 102 communicates with the second liquid inlet joint 23, and the other end communicates with the second liquid outlet joint 24. The first flow channel structure 101 and the second flow channel structure 102 can independently circulate the cooling medium. Since the temperature in the center of the large surface of the battery cell 3 is relatively high and the temperature at the edge of the large surface is relatively low, cooler cooling medium can be injected into the first flow channel structure 101, or the flow rate of the cooling medium in the first flow channel structure 101 can be increased, so as to provide a better heat dissipation effect for the battery cell 3.

[0055] The embodiment of the present utility model also provides a battery pack, including the liquid cooling plate described in any one of the foregoing items.

[0056] Specifically, the battery pack further includes a box body, a cover plate, battery units, a control unit, etc. The box body has a receiving cavity, and the battery units are arranged in the receiving cavity. The battery units are formed by connecting multiple battery cells 3 in series or in parallel to realize the charging and discharging functions of the battery pack. The control unit is electrically connected to the battery units and can monitor the temperature, voltage, current, etc. during the charging and discharging process of the battery units to ensure the safe progress of the charging and discharging process. The cover plate is fixedly connected to the box body and is used to cover the receiving cavity to protect the battery units and the control unit inside the receiving cavity, and prevent external water vapor, dust, etc. from entering the receiving cavity and affecting the performance of the battery units. The liquid cooling plate constitutes the heat dissipation system inside the battery pack. The liquid cooling plate is arranged between the large surfaces of two adjacent battery cells 3 to effectively dissipate heat from the large surfaces of the battery cells 3. Since the thickness dimension of the flow channel cavity 10 in the middle area of the liquid cooling plate body 1 is smaller than the thickness dimension of the flow channel cavity 10 in the edge area of the liquid cooling plate body 1, a certain expansion space can be provided for the large surface of the battery cell 3 to avoid hindering the expansion of the battery cell 3, so as to ensure the heat dissipation effect and charging and discharging ability of the battery cell 3, improve the charging and discharging performance of the battery pack, and help to realize the fast charging and discharging of the battery pack.

[0057] Further, referring to Figure 5, the battery pack further includes a plurality of battery cells 3; the plurality of battery cells 3 are stacked in a straight-line arrangement, and the liquid cooling plate is disposed in the gap between adjacent battery cells 3, and the liquid cooling plate abuts against the largest surface of the battery cell 3.

[0058] Specifically, the battery cell 3 can be in the shape of a cube, and the plurality of battery cells 3 are stacked in a straight-line arrangement. The arrangement direction can be the direction consistent with the vehicle body length of the vehicle, such as Figure 5 the indicated Y direction. Along the indicated Y direction, a gap for installing the liquid cooling plate is reserved between adjacent battery cells 3. The liquid cooling plate can be inserted and fixed in this gap, and both sides of the liquid cooling plate can respectively abut against the largest surfaces of battery cells 3 at different positions, so as to achieve large-area heat dissipation and cooling with the battery cells 3.

[0059] The present invention also provides a vehicle including the aforementioned battery pack.

[0060] Specifically, the vehicle can be a pure electric vehicle or a hybrid vehicle. The vehicle is applied with the battery pack of the aforementioned embodiment, and the battery pack has good fast charging and discharging capabilities, which helps to alleviate the charging anxiety and range anxiety of the vehicle.

[0061] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or terminal device including the said element.

[0062] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid cooling plate, characterized in that: Including a liquid cooling plate body; The liquid cooling plate body is provided with a plurality of flow channel cavities for circulating cooling medium, and the plurality of flow channel cavities are extended and arranged along the length direction of the liquid cooling plate body; Along the height direction of the liquid cooling plate body, the thickness dimension of the flow channel cavity near the middle area of ​​the liquid cooling plate body is smaller than the thickness dimension of the flow channel cavity near the edge area of ​​the liquid cooling plate body.

2. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling plate body includes a first plate body and a second plate body connected to each other, and a plurality of flow channel cavities are formed between the first plate body and the second plate body.

3. The liquid cooling plate according to claim 2, characterized in that: The first plate body is provided with a plurality of first recessed cavities arranged at intervals, and the second plate body is provided with a plurality of second recessed cavities arranged at intervals; The first recessed cavity corresponds to the second recessed cavity one by one, and the flow channel cavity is formed between the first recessed cavity and the second recessed cavity.

4. The liquid cooling plate according to claim 2, characterized in that: A first heat-conducting medium is coated on a side of the first plate body facing away from the second plate body, and a second heat-conducting medium is coated on a side of the second plate body facing away from the first plate body.

5. The liquid cooling plate according to claim 4, characterized in that: Along the height direction of the liquid cooling plate body, the thickness of the first heat conducting medium near the middle area of ​​the liquid cooling plate body is greater than the thickness of the first heat conducting medium near the edge area of ​​the liquid cooling plate body; And / or, along the height direction of the liquid cooling plate body, the thickness of the second heat conducting medium near the middle area of ​​the liquid cooling plate body is greater than the thickness of the second heat conducting medium near the edge area of ​​the liquid cooling plate body.

6. The liquid cooling plate according to claim 3, characterized in that: The liquid cooling plate body further includes a third plate body, and the third plate body is arranged between the first plate body and the second plate body; The third plate body is provided with a through hole, and the through hole is provided between the first recessed cavity and the second recessed cavity.

7. The liquid cooling plate according to claim 6, characterized in that: The first concave cavity and the second concave cavity are symmetrical to each other along the third plate body.

8. The liquid cooling plate according to claim 1, characterized in that: Along the length direction of the liquid cooling plate body, the thickness dimension of the flow channel cavity near the middle area of ​​the liquid cooling plate body is smaller than the thickness dimension of the flow channel cavity near the edge area of ​​the liquid cooling plate body.

9. The liquid cooling plate according to claim 1, characterized in that: It also includes a pipe joint, which is connected to the edge area of ​​the liquid cooling plate body, and the pipe joint is communicated with the flow channel cavity.

10. The liquid cooling plate according to claim 9, characterized in that: The pipe joint comprises a first liquid inlet joint, a first liquid outlet joint, a second liquid inlet joint, and a second liquid outlet joint; A portion of the plurality of flow channel cavities are interconnected to form a first flow channel structure, and another portion of the plurality of flow channel cavities are interconnected to form a second flow channel structure; One end of the first flow channel structure is connected to the first liquid inlet joint, and the other end is connected to the first liquid outlet joint; one end of the second flow channel structure is connected to the second liquid inlet joint, and the other end is connected to the second liquid outlet joint.

11. A battery pack, characterized in that: The liquid cooling plate comprises the liquid cooling plate according to any one of claims 1 to 10.

12. The battery pack according to claim 11, characterized in that: Also included are a plurality of battery cells; The plurality of battery cells are stacked and arranged in a straight line, the liquid cooling plate is arranged in the gap between the adjacent battery cells, and the liquid cooling plate abuts against the largest surface of the battery cells.

13. A vehicle, characterized in that: Includes the battery pack described in claim 11 or claim 12.

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