Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle, and belongs to the technical field of power batteries, the battery pack uses a liquid cooling plate as a side plate in a battery pack to clamp and fix the battery pack so as to replace a side plate in a traditional battery pack, and the structure of the liquid cooling plate is arranged into a first section and a second section which are arranged along a third direction, so that the liquid cooling plate is convenient to use. The first section is internally provided with a flow channel to form heat exchange with the battery pack, so that single batteries in the battery pack are kept at a proper temperature, and the second section is connected with the first section to form heat conduction with the first section, so that heat accumulated in the first section through heat exchange is conducted to the second section; the temperature of the part of the battery pack corresponding to the first section is close to or even close to the temperature of the part of the battery pack corresponding to the second section, the temperature equalizing effect of the battery pack is achieved, the service life of the battery pack is prolonged, the space utilization rate in the battery pack is improved, and the energy density of the whole pack is improved.

Description

Technical Field

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

[0002] In existing battery packs, the structure of the battery pack varies depending on the shape of the individual battery cells used. Traditional battery packs typically include components such as insulating plates and side plates to improve the overall strength of the battery pack. However, due to the large number of structural components, the space utilization rate inside the battery pack decreases, affecting the energy density of the battery pack. Utility Model Content

[0003] The purpose of this application is to provide a battery pack and vehicle to solve the problem of reduced space utilization in the current battery pack housing.

[0004] A first aspect of this application provides a battery pack having a first direction, a second direction, and a third direction that intersect each other. The battery pack includes: a battery group having two sides disposed opposite to each other along the second direction; and a liquid cooling plate extending along the first direction and connected to the sides. The liquid cooling plate includes a first segment and a second segment arranged along the third direction, both extending along the first direction and thermally connected to the sides. The first segment has a flow channel for circulating a heat-conducting medium and is thermally connected to the sides. The second segment is connected to the first segment to form a heat conduction with the first segment and is thermally connected to the sides.

[0005] A second aspect of this application provides a vehicle including the battery pack as described above.

[0006] In summary, this application provides a battery pack and a vehicle having the battery pack. The battery pack uses a liquid cooling plate as a side plate in the battery pack to clamp and fix the battery pack, thereby replacing the side plate in the traditional battery pack. The liquid cooling plate is structured as a first section and a second section arranged along a third direction. The first section has a flow channel to form a heat exchange with the battery pack, so that the battery cells in the battery pack are kept at a suitable temperature. The second section is connected to the first section to form a heat conduction with the first section. The second section increases the heat exchange area, so that the second section conducts the heat of the battery pack to the first section, and dissipates the heat through the heat-conducting medium in the flow channel. This achieves that the temperature of the battery pack part corresponding to the first section is similar to or even close to the temperature of the battery pack part corresponding to the second section, achieving a uniform temperature effect of the battery pack, improving the service life of the battery pack, and avoiding the waste of space between the battery pack and the liquid cooling plate. Therefore, the space utilization rate of the battery pack can be improved. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the battery pack structure provided in the embodiments of this application;

[0009] Figure 2 This is a schematic diagram of the first angle structure of the combination of liquid cooling plate and battery pack in the battery pack provided in the embodiments of this application;

[0010] Figure 3 yes Figure 2 Top view;

[0011] Figure 4 yes Figure 2 Exploded view;

[0012] Figure 5 This is a second-angle structural diagram of the combination of liquid cooling plate and battery pack in the battery pack provided in the embodiments of this application;

[0013] Figure 6 yes Figure 5 A magnified structural diagram at point A;

[0014] Figure 7 yes Figure 1 BB-direction sectional view;

[0015] Figure 8 yes Figure 7 A magnified structural diagram at point C;

[0016] Figure 9 This is a schematic diagram of the structure of the first battery cell in the battery pack provided in the embodiments of this application;

[0017] Figure 10 This is a schematic diagram of the structure of the separator in the battery pack provided in the embodiments of this application;

[0018] Figure 11 yes Figure 10 DD section view;

[0019] Figure 12 This is a schematic diagram of the structure of the insulating plate in the battery pack provided in the embodiments of this application;

[0020] Figure 13 yes Figure 12 EE-directed sectional view.

[0021] Explanation of key figure labels:

[0022] 1. Battery pack; 10. Battery group; 11. Battery cell; 111. First side wall; 112. Second side wall; 113. Third side wall; 114. Fourth side wall; 115. Bottom wall; 116. Top wall; 117. Terminal post; 12. Side; 13. End face; 14. First face; 15. Second face; 20. Liquid cooling plate; 201. Side liquid cooling plate; 202. Middle liquid cooling plate; 21. First section; 22. Second section; 221. Chamber; 222. Reinforcing rib; 23. Current collector; 24. Liquid inlet end; 25. Liquid outlet end; 30. First adhesive layer; 40. Heat insulation plate; 41. First surface; 42. Second surface; 43. First groove; 50. Insulating plate; 51. Second groove; 60. Housing; 61. First wall; 62. Second wall; 70. Second adhesive layer; 80. Crossbeam;

[0023] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0024] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0025] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the embodiments of the application, "parallel" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is -1° to 1°. "Perpendicular" refers to a state in which the angle formed by two lines, a line and a surface, or a surface is 89° to 91°. Equal distances or equal angles refer to a state in which the tolerance range is -1% to 1%.

[0029] This embodiment provides a vehicle, including a battery pack.

[0030] In some embodiments, a battery pack 1 is provided, with reference to Figures 1 to 7 The battery pack 1 includes a battery assembly 10 and a liquid cooling plate 20. The battery pack 1 has three intersecting directions: a first direction X, a second direction Y, and a third direction Z, as detailed below. Figures 1 to 7 In the embodiment shown, the first direction X, the second direction Y, and the third direction Z are all orthogonal to each other.

[0031] In some embodiments, refer to Figure 4 The battery pack 10 has two sides 12 arranged opposite each other along the second direction Y, specifically, referring to Figures 1-9 The battery pack 10 includes a plurality of battery cells 11 arranged along the first direction X, as shown in the figure. Figure 9Each battery cell 11 includes a first sidewall 111 and a second sidewall 112 arranged opposite each other along a first direction X, a third sidewall 113 arranged opposite each other along a second direction Y, and a bottom wall 115 and a top wall 116 arranged opposite each other along a third direction Z. The first sidewall 111, the third sidewall 113, the second sidewall 112, and the fourth sidewall 114 form a shell with openings at both ends along the third direction Z. The bottom wall 115 and the top wall 116 respectively cover the openings at both ends of the shell in the third direction Z. The first sidewall 111 and the second sidewall 112 are the sidewalls with the largest surface area. In the battery pack 10, the third sidewalls 113 of multiple battery cells 11 are arranged along the first direction X to form one side 12 of the battery pack 10, and the fourth sidewalls 114 of multiple battery cells 11 are arranged along the first direction X to form another side 12 of the battery pack 10.

[0032] In some embodiments, refer to Figure 1 The battery pack 1 contains multiple battery groups 10, which are arranged at intervals along the second direction Y.

[0033] In some embodiments, refer to Figures 1-6 The liquid cooling plate 20 extends along the first direction X. The liquid cooling plate 20 is disposed on the side 12 of the battery pack 10 and is thermally connected to the side 12. That is, the third sidewall 113 and the fourth sidewall 114 of the battery cell 11 in the battery pack 10 are respectively connected to the first section 21 of the adjacent liquid cooling plate 20 to form heat conduction. Specifically, refer to Figure 6 The liquid cooling plate 20 includes a first section 21 and a second section 22 arranged along a third direction Z. The first section 21 and the second section 22 extend along a first direction X, respectively. A flow channel (not shown in the figure) is provided in the first section 21 to flow the heat-conducting medium. The second section 22 is connected to the first section 21 to form a heat conduction with the first section 21. The liquid cooling plate 20 also includes an inlet end 24 and an outlet end 25. One end of the first segment 21 in the first direction X is connected to the inlet end 24, and the other end of the first segment 21 in the first direction X is connected to the outlet end 25. The heat-conducting medium enters the first segment 21 from the inlet end 24, flows in the first segment 21 and flows out from the outlet end 25. During the flow of the heat-conducting medium in the first segment 21, it exchanges heat with the side surface 12 of the battery pack 10 to regulate the temperature of the battery pack 10. The second segment 22 is connected to the first segment 21, and the second segment 22 and the first segment 21 form a heat conduction. The heat generated by the battery pack 10 can be conducted to the first segment 21 through the second segment 22, so that the first segment 21 and the second segment 22 have a uniform temperature, thereby ensuring the uniformity of the temperature distribution on the side surface of the battery pack 10 in the third direction Z. Moreover, the second segment 22 can increase the bonding area between the liquid cooling plate 20 and the side surface 12 and can increase the bearing area of ​​the liquid cooling plate 20, thereby improving the overall mode of the battery pack.

[0034] In existing battery packs, side panels are usually installed inside the box to ensure the stability of the battery pack during installation. The side panels clamp the sides of the battery pack to improve the stability and firmness of the battery pack during installation. However, the side panels occupy too much space inside the box, resulting in a decrease in the utilization rate of the space inside the box. Moreover, the side panels only serve to clamp the battery pack and will affect the heat dissipation of the sides of the battery pack, thus affecting the lifespan of the battery pack.

[0035] The battery pack 1 provided in this application embodiment uses a liquid cooling plate 20 on the side 12 of the battery pack 10 to replace the side plate in the existing battery pack. The liquid cooling plate 20 clamps and fixes the two sides 12 of the battery pack 10 in the second direction Y. The liquid cooling plate 20 includes a first section 21 and a second section 22 arranged in the third direction Z. The first section 21 has a heat-conducting medium flowing in it to form heat exchange with the side 12 of the battery pack 10. The second section 22 is connected to the first section 21 to form heat conduction with the first section 21, so that the first section 21 and the second section 22 are at the same temperature. While clamping and fixing the battery pack 10 on both sides in the second direction Y, it can also form heat exchange with the side 12 of the battery pack 10 to regulate the temperature of the battery pack 10 so that the battery pack 10 is at a suitable operating temperature.

[0036] In some embodiments, no heat-conducting medium flows in the second segment 22. The second segment 22 is only connected to the first segment 21 in the liquid cooling plate 20 to play a heat exchange role. The heat-conducting medium only flows in the first segment 21, thereby reducing the overall weight of the liquid cooling plate 20, which in turn helps to reduce the overall weight of the battery pack 1 and realize the lightweight design of the battery pack 1.

[0037] In some embodiments, refer to Figures 2-6 The liquid cooling plate 20 also includes a current collector 23, which is connected to the first segment 21 and arranged along the third direction Z with the second segment 22. Generally, the current collector 23 has a corresponding collection cavity and is provided with a liquid inlet 24 and a liquid outlet 25. The collection cavity connects the flow channel to the liquid inlet 24, or the collection cavity connects the flow channel to the liquid outlet 25, so as to realize the circulation of the heat transfer medium. In this way, the current collector 23 is only connected to the first segment 21, and the second segment 22, which does not have a flow channel, does not need a corresponding current collector, which can reduce the material of the current collector 23, thereby reducing the weight of the liquid cooling plate 20, thereby increasing the energy density of the entire package, and the reduction of the material of the current collector 23 can reduce the manufacturing cost.

[0038] In some embodiments, refer to Figure 4The battery pack 1 also includes a first adhesive layer 30. In the second direction Y, the liquid cooling plate 20 is bonded to the side surface 12 of the adjacent battery pack 10 via the first adhesive layer 30. The first adhesive layer 30 is a thermally conductive adhesive layer. The design of the thermally conductive adhesive layer can fix the liquid cooling plate 20 to the side surface 12 on the one hand, and improve the heat conduction effect between the battery pack 10 and the liquid cooling plate 20 on the other hand.

[0039] In some embodiments, the first segment 21 of the liquid cooling plate 20 is bonded to the adjacent side 12 by a first adhesive layer 30 to ensure the strong connection between the first segment 21 and the adjacent side 12 and to ensure the heat conduction efficiency between the heat-conducting medium in the first segment 21 and the battery pack 10.

[0040] In some embodiments, there is a gap between the second segment 22 of the liquid cooling plate 20 and the adjacent side 12 in the second direction Y. The structural design of the gap avoids direct contact between the second segment 22 and the side 12, so that the second segment 22 only forms heat conduction with the first segment 21, ensuring the heat conduction effect between the first segment 21 and the second segment 22.

[0041] In some embodiments, the second segment 22 of the liquid cooling plate 20 is bonded to the adjacent side 12 by a first adhesive layer 30, which can ensure the connection stability between the second segment 22 and the side 12 of the battery pack 10, and can also realize heat conduction between the second segment 22 and the adjacent side 12 by the first adhesive layer 30.

[0042] In some embodiments, refer to Figure 6 The first section 21 and the second section 22 of the liquid cooling plate 20 are integrally formed, thereby improving the manufacturing efficiency of the liquid cooling plate 20 and reducing the manufacturing cost.

[0043] In some embodiments, refer to Figure 6 The second segment 22 contains a chamber 221 extending along a first direction X. The chamber 221 is isolated from the flow channels in the first segment 21. Specifically, the flow channels in the first segment 21 (true flow channels for the flow of heat-conducting medium) and the false flow channels (where heat-conducting medium does not flow) defined by the chamber 221 in the second segment 22 are spaced apart along a third direction Z. The design of the chamber 221 in the second segment 22 creates a hollow structure, thereby reducing the overall weight of the second segment 22 and contributing to the lightweight design of the entire battery pack 1. In other embodiments, the chamber 221 may not be provided in the second segment 22; that is, the second segment 22 can be a solid structure. Solid structures generally have better thermal conductivity than hollow structures. This allows for better heat transfer from the second segment to the first segment through the solid second segment 22, thereby improving the efficiency and temperature uniformity of the battery pack.

[0044] In some embodiments, refer to Figure 6The cavity 221 is provided with a reinforcing rib 222, which extends along the first direction X. The two sides of the reinforcing rib 222 in the second direction Y are respectively connected to the adjacent inner wall of the cavity 221. The design of the reinforcing rib 222 can improve the overall strength of the second section 22.

[0045] In some embodiments, a bottom liquid cooling plate (not shown in the figure) is provided on the bottom surface of the battery pack 10 to form heat exchange with the bottom surface of the battery pack 10. However, when the heat exchange effect of the bottom liquid cooling plate is poor, for example, when the bottom surface of the battery pack 10 separates from the bottom liquid cooling plate due to the shaking of the battery pack 1, the second section 22 in the liquid cooling plate 20 can be changed from a false flow channel to a true flow channel. That is, the heat-conducting medium can flow in the second section 22 to form heat exchange with the side 12 of the battery pack 10, thereby ensuring the heat exchange effect of the battery pack 10. Flow channels are provided in both the first section 21 and the second section 22 to improve the heat exchange efficiency.

[0046] In some embodiments, the number of battery packs 10 in the battery pack 1 is at least two, specifically as follows: Figure 1 In the described embodiment, there are six battery packs 10, with each pair of battery packs 10 forming a battery unit group. The battery pack 1 contains three battery unit groups, arranged at intervals along the second direction Y, as detailed below. Figures 2-5 In the embodiment shown, there are three liquid cooling plates 20, which are arranged at intervals along the second direction Y. The three liquid cooling plates 20 include two side liquid cooling plates 201 and one middle liquid cooling plate 202. The middle liquid cooling plate 202 is disposed between the two side liquid cooling plates 201. A battery unit group is disposed between the adjacent side liquid cooling plates 201 and the middle liquid cooling plate 202 in the second direction Y. This not only achieves the heat exchange effect of the battery unit group, but also fixes two adjacent battery unit groups in the second direction Y into a whole, thereby improving space utilization.

[0047] In some embodiments, refer to Figure 4 Battery pack 1 also includes: heat insulation plate 40, see reference Figures 1-4 The battery pack 10 includes a plurality of battery cells 11 arranged along a first direction X, and a heat insulation plate 40 is provided between two adjacent battery cells 11 in the first direction X, as detailed below. Figure 4 In the illustrated embodiment, the heat insulation plate 40 is disposed between two adjacent battery cells 11 located at one end in the first direction X. In other implementations, heat insulation plates 40 are disposed between two adjacent battery cells 11 at opposite ends in the first direction X of the battery pack 10. Alternatively, heat insulation plates 40 are disposed between two adjacent battery cells 11 in the first direction X. The specific implementation can be selected according to actual usage requirements.

[0048] Specifically, such as Figure 1In the illustrated embodiment, the battery pack 1 further includes a housing 60 and a crossbeam 80, wherein the housing 60 has an internal receiving cavity, as shown in the figure. Figure 4 The battery pack 1 also includes an insulating plate 50. The battery assembly 10 and the crossbeam 80 are both housed within the casing 60. The crossbeam 80 is internally connected to two opposing walls of the casing 60 along the second direction Y. The battery assembly 10 includes two opposing end faces 13 along the first direction X, at least one end face 13 abutting against the crossbeam 80. The insulating plate 50 is disposed between the end face 13 and the crossbeam 80. The insulating plate 50 can be adhesively attached to the end face 13 of the battery assembly 10, providing insulation protection for the end face 13 of the battery assembly 10, thereby protecting the battery assembly 10 within the casing 60 of the battery pack. An insulating plate 50 is provided between the battery pack 10 and the crossbeam 80. The battery pack 10 abuts against the crossbeam 80 through the insulating plate 50, forming a clamping and fixing of the battery pack 10 in the first direction X. Combined with the liquid cooling plate 20, which serves as a substitute side plate, clamping and fixing the side of the battery pack 10 in the second direction Y, the battery pack 10 is provided with a pre-tightening force limiting function. This ensures that the assembled battery pack 10 has a pre-tightening force along the first direction X. The presence of the pre-tightening force can improve the cycle life of the battery cells 11 in the battery pack 10.

[0049] In some embodiments, the heat insulation plate 40 is a heat insulation component. The temperature of the battery cell 11 in the battery pack 10 can be regulated by the heat exchange of the liquid cooling plate 20. The heat insulation plate 40 can block the heat transfer between the battery cell 11 located at the end of the battery pack 10 and the adjacent battery cell 11 in the first direction X, thus ensuring the service life of the battery pack 10.

[0050] In some embodiments, refer to Figures 10-11 The heat insulation plate 40 includes a first surface 41 and a second surface 42 disposed opposite to each other along a first direction X; at least one of the first surface 41 and the second surface 42 has a first groove 43, the first groove 43 extending recessedly from one of the first surface 41 or the second surface 42 towards the other, along the first direction X in a plane perpendicular to the first direction X, the orthographic projection of the battery cell 11 covers the orthographic projection of the first groove 43, wherein the orthographic projection of the first groove 43 may be a closed area enclosed by the projection of the groove wall of the first groove 43. (Refer to...) Figure 4 The heat insulation plate 40 is disposed between two adjacent battery cells 11 located at one end in the first direction X. In the two adjacent battery cells 11, the second surface 42 faces the battery cell 11 located at the end of the battery pack 10 in the first direction X, and the first surface 41 faces the other battery cell 11 in the first direction X. Specifically, as shown... Figure 11In the illustrated embodiment, a first groove 43 is provided on the first surface 41 and the second surface 42 respectively. When the heat insulation plate 40 abuts against the first sidewall 111 or the second sidewall 112 of the adjacent battery cell 11, the first groove 43 on the first surface 41 covers the first sidewall 111 or the second sidewall 112 and defines a first cavity (not shown in the figure). The first cavity can provide expansion space for the battery cell 11. The first surface 41 located outside the opening end of the first groove 43 forms a U-shaped area. The U-shaped area abuts against the first sidewall 111 or the second sidewall 112 and can transmit the expansion force and pre-tightening force generated by the first battery cell 11 during the cyclic charging and discharging process, thus ensuring the service life of the battery cell 11. Similarly, when the heat insulation plate 40 abuts against the battery cell 11 located at the end of the battery pack 10, the first groove 43 formed on the second surface 42 covers the side of the battery cell 11 located at the end of the battery pack 10 facing the second surface 42 in the first direction X and defines a second cavity (equivalent to the first groove 43). The first groove 43 can provide expansion space for the battery cell 11 located at the end of the battery pack 10. The second surface 42 located outside the opening end of the first groove 43 forms a U-shaped area. This U-shaped area abuts against the side of the battery cell 11 located at the end of the battery pack 10 facing the second surface 42 in the first direction X, which can transmit the expansion force and pre-tightening force generated by the battery cell 11 located at the end of the battery pack 10 during the cycle charging and discharging process, and ensure the service life of the battery cell 11 located at the end of the battery pack 10.

[0051] In some embodiments, refer to Figure 12 and Figure 13 An insulating plate 50 has a second groove 51 on the side facing the end face 13 of the battery pack 10 in the first direction X. The second groove 51 is disposed opposite to the end face 13 in the first direction X. When the insulating plate 50 abuts against the end face 13 of the battery pack 10, the second groove 51 covers the end face 13 of the battery pack 10 and defines a third cavity (equivalent to the second groove 51). The second groove can provide expansion space for the battery cell 11 located at the end of the battery pack 10 in the first direction X. A U-shaped area is formed on the surface outside the opening end of the second groove 51. The U-shaped area abuts against the end face 13 of the battery pack 10 and can transmit the expansion force and pre-tightening force generated by the battery pack 10 during the cycle charging and discharging process, so as to ensure the service life of the battery cell 11 in the battery pack 10.

[0052] In some embodiments of this application, reference is made to Figure 1 , Figure 7 and Figure 8 The battery pack 1 also includes a second adhesive layer 70, the housing 60 includes a first wall 61 and a second wall 62 disposed opposite each other along the third direction Z, and the battery pack 10 includes a first surface 14 and a second surface 15 disposed opposite each other along the third direction Z, as shown below. Figure 8In the illustrated embodiment, the second adhesive layer 70 is disposed between the first surface 14 of the battery pack 10 and the first wall 61 of the housing 60, and the second surface 15 of the battery pack 10 and the second wall 62 of the housing 60 are spaced apart. Specifically, the second surface 15 of the battery pack 10 and the second wall 62 are spaced apart along the third direction Z. Specifically, the first wall 61 is the bottom wall of the housing 60, and the second wall 62 is the top wall of the housing 60. The second adhesive layer 70 disposed between the first surface 14 of the battery pack 10 and the first wall 61 of the housing 60 can both achieve heat exchange of the battery pack 10 and further strengthen the fixation of the battery pack 10.

[0053] In some embodiments, refer to Figure 1 The battery pack 1 also includes potting compound (not shown in the figure), which fills the gap between the battery pack 10 and the crossbeam 80 to transmit expansion force and vibration load.

[0054] In some embodiments, refer to Figure 4 and Figure 6 Along the third direction Z, the maximum dimension of the side 12 of the battery pack 10 is H3 mm, 80mm≤H3≤120mm. Specifically, the value of H3 can be any value among 80mm, 90mm, 100mm, 110mm, and 120mm, or any value within a range of any two values. (Refer to...) Figure 6 and Figure 9 The battery cell 11 includes a terminal post 117, which protrudes from the top wall 116 of the battery cell 11. The maximum dimension of the side 12 in the third direction Z is equivalent to the distance between the plane of the end face of the terminal post 117 facing away from the top wall 116 and the plane of the bottom wall 115 in the third direction Z.

[0055] In some embodiments, refer to Figure 6 Along the third direction Z, the maximum dimension of the first segment 21 of the liquid cooling plate 20 is H1 mm, 40 mm ≤ H1 ≤ 80 mm. Specifically, the value of H1 can be any value among 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, and 80 mm, or any value within the range of any two values.

[0056] In some embodiments, refer to Figure 6 Along the third direction Z, the maximum dimension of the second segment 22 of the liquid cooling plate 20 is H2mm, 0mm≤H2≤40mm. Specifically, the value of H2 can be any value among 0mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, and 40mm, or any value within the range of any two values.

[0057] In some embodiments, 0.1 ≤ H2 / H3 ≤ 0.5, H1 ≥ H2. Specifically, the value of H2 / H3 can be any value from 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, or any value within a range of any two values. When the value of H2 / H3 is within the above range, the heat exchange efficiency between the battery pack 10 and the heat-conducting medium in the flow channel of the first segment 21 is guaranteed, while avoiding the liquid cooling plate 20 occupying too much space in the third direction Z, ensuring the space utilization rate of the battery pack 1 in the third direction Z, and ensuring the energy density of the battery pack 1.

[0058] Since the liquid cooling plate 20 also needs to be connected to the external pipeline through the current collector 23, in order to avoid assembly interference between the external pipeline or the current collector 23 and the battery pack 10, in some embodiments, the maximum size of the first segment 21 along the first direction X is greater than the maximum size of the battery pack 10, so that the first segment 21 can extend beyond the battery pack 10 in the first direction X to connect to the corresponding current collector or external pipeline for the circulation of the heat transfer medium.

[0059] Since the flow channel for the heat-conducting medium is only provided in the first segment 21, and the current collector 23 is only connected to the first segment 21, the second segment 22 does not need to be connected to external pipes or the current collector 23, thus avoiding assembly interference. Therefore, in some embodiments, the maximum size of the first segment 21 along the first direction X is larger than the maximum size of the second segment 22, thereby minimizing the volume and weight occupied by the second segment 22 without flow channels, thereby improving the energy density of the battery pack. Preferably, the size of the second segment 22 along the first direction X is similar to the size of the battery pack 10, ensuring the heat exchange area between the second segment 22 and the battery pack 10, and thus ensuring the heat dissipation uniformity of the battery pack 10.

[0060] In some embodiments, the liquid cooling plate 20 is disposed in the receiving cavity, the first segment 21 extends through the crossbeam 80 along the first direction X, and the second segment 22 is disposed on the side of the crossbeam 80 near the battery pack 10. Thus, external water pipes and other structures can be disposed on the side of the crossbeam 80 away from the battery pack 10 and communicate with the flow channel in the first segment 21. This allows for more rational partitioning of components within the battery pack, preventing external water pipes and other structures from affecting the assembly stability of the battery pack 10.

[0061] In some embodiments, along the second direction Y, the maximum size of the second segment 22 is smaller than the maximum size of the first segment 21. This minimizes the thickness of the second segment 22, thereby reducing its volume and weight, and ultimately increasing the energy density of the battery pack. Of course, when the thickness of the second segment 22 is less than the thickness of the first segment 21, the thickness of the first adhesive layer 30 located between the second segment 22 and the battery pack 10 can be greater than the thickness of the first adhesive layer 30 between the first segment 21 and the battery pack 10, thus ensuring the reliability of the thermally conductive connection between the battery pack 10 and the second segment 22.

[0062] In some embodiments, the liquid cooling plate 20 is disposed in the receiving cavity, and the second segment 22 is connected to the housing 60. The connection between the second segment 22 and the housing can improve the connection reliability of the liquid cooling plate 20 within the housing 60, and the force on the battery pack 10 can be transmitted to the housing 60 via the second segment 22, thereby improving the overall pack performance. The connection between the second segment 22 and the housing 60 can be adhesive or bolted, and is not limited here.

[0063] In other embodiments, the second segment 22 is connected to the crossbeam 80, which can also improve the overall pack mode of the battery pack. Alternatively, the second segment 22 is connected to both the housing 60 and the crossbeam 80.

[0064] The present application will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed in the present application.

[0065] Example 1

[0066] Assemble battery pack 1:

[0067] The battery pack 10 is placed in the housing 60, and the end face 13 of the battery pack 10 abuts against the crossbeam 80 along the first direction X. An insulating plate 50 is set between the end face 13 and the crossbeam 80. A heat insulation plate 40 is set between two adjacent battery cells 11 of the battery pack 10 near one end of the crossbeam 80 in the first direction X. A liquid cooling plate 20 is set on the side of the battery pack 10. The housing 60 of the battery pack 1 contains six battery packs 10. Every two battery packs 10 constitute a battery unit group. Three battery unit groups are arranged at intervals along the second direction Y. There are three liquid cooling plates 20, including two side liquid cooling plates 201 and one middle liquid cooling plate 202. A set of battery unit groups is set between adjacent side liquid cooling plates 201 and middle liquid cooling plates 202 in the second direction Y.

[0068] The side 12 of the battery pack 10 has a dimension H3 of 108 mm in the third direction Z. The first segment 21 of each liquid cooling plate 20 has a dimension H1 of 10 mm in the third direction Z, and the second segment 22 has a dimension H2 of 70 mm in the third direction Z.

[0069] Examples 2-10

[0070] The battery pack 1 is assembled using the method provided in Example 1, except for the following differences:

[0071] By adjusting the manufacturing process of the liquid cooling plate 20, the dimensions H1 of the first segment 21 in the third direction Z and H2 of the second segment 22 in the third direction Z are adjusted, and the dimension H3 of the side 12 in the third direction Z is adjusted, as detailed in Table 1.

[0072] Comparative Example 1

[0073] The battery pack is assembled using the method provided in Example 1, except for the following differences:

[0074] A side plate is used on the side 12 of the battery pack 10 instead of the liquid cooling plate 20 to clamp and fix the battery pack 10 in the second direction Y.

[0075] Dimension measurement method: The dimensions H1 of the first segment 21 in the third direction Z, the dimensions H2 of the second segment 22 in the third direction Z, and the dimensions H3 of the side 12 in the third direction Z are measured using either a ruler or a vernier caliper.

[0076] Energy density testing method: Measure the weight of each battery cell 11 multiple times and take the average value M1. Measure the weight of the battery pack 1 multiple times and take the average value M2. Energy density = nM1 / M2, where n is the number of battery cells 11 in the battery pack.

[0077] Table 1

[0078]

[0079]

[0080] As can be seen from Table 1, referring to Examples 1 to 8, when the dimension H3 of the side 12 of the battery pack 10 in the third direction Z remains unchanged, the dimension of the battery cell 11 in the third direction Z in the battery pack 10 remains unchanged. Therefore, the energy density of the battery pack remains unchanged, which is 170Wh / kg.

[0081] Referring to Examples 1-8, with the liquid cooling plate 20 maintaining a constant dimension (80mm) in the third direction Z, as the dimension H1 of the first segment 21 in the third direction Z increases, the dimension H2 of the second segment 22 in the third direction Z decreases, thereby increasing the contact area between the first segment 21 and the battery pack 10, ensuring the heat exchange efficiency between the heat-conducting medium in the flow channel of the first segment 21 and the battery pack 10, and avoiding the liquid cooling plate 20 occupying too much space in the third direction Z, thus ensuring the space utilization rate of the battery pack 1 in the third direction Z.

[0082] Referring to Examples 1 to 8, while the dimension H3 of the side 12 of the battery pack 10 in the third direction Z remains unchanged, as the dimension H2 of the second segment 22 in the third direction Z decreases, the contact area between the second segment 22 and the side 12 of the battery pack 10 decreases, affecting the heat dissipation balance of the battery pack 10.

[0083] Referring to Examples 9-13, with the dimensions H1 of the first segment 21 in the third direction Z and H2 of the second segment 22 in the third direction Z remaining unchanged, as the dimension H3 of the side 12 of the battery pack 10 in the third direction Z increases, the value of H2 / H3 shows a decreasing trend. This indicates that the dimension of the battery cell 11 in the third direction Z of the battery pack 10 increases, the weight of the battery cell 11 increases, and thus the energy density of the battery pack shows an increasing trend.

[0084] Referring to Example 8 and Comparative Example 1, compared with Example 8, Comparative Example 1 uses a side plate instead of a liquid cooling plate 20 to clamp and fix the side 12 of the battery pack 10 in the second direction Y. Under the premise that the dimension H3 of the side 12 of the battery pack 10 in the third direction Z is the same (both are 108mm), since Example 8 uses a liquid cooling plate 20 to clamp and fix the side 12 of the battery pack 10 in the second direction Y, and the first section 21 of the liquid cooling plate 20 has a flow channel and a heat-conducting medium flows through it, the overall weight of the battery pack provided in Example 8 is higher than that of the battery pack provided in Comparative Example 1. Therefore, the energy density of the battery pack provided in Example 8 is lower than that of the battery pack provided in Comparative Example 1. However, in Example 8, the liquid cooling plate 20 is used to clamp and fix the side 12 of the battery pack 10 in the second direction Y. The heat-conducting medium flowing in the first section 21 can form heat exchange with the battery cells 11 in the battery pack 10, control the temperature of the battery cells 11, and improve the service life of the battery pack.

[0085] The technical solutions provided by the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery pack, characterized in that, The battery pack has a first direction (X), a second direction (Y), and a third direction (Z) that intersect each other in pairs, and the battery pack includes: A battery pack (10) having two sides (12) disposed opposite each other along the second direction (Y); Liquid cooling plate (20), the liquid cooling plate (20) extends along the first direction (X), the liquid cooling plate (20) is connected to the side surface (12), the liquid cooling plate (20) includes a first segment (21) and a second segment (22) arranged along the third direction (Z), the first segment (21) and the second segment (22) both extend along the first direction (X) and both are thermally connected to the side surface (12); The first section (21) is provided with a flow channel to allow the flow of heat-conducting medium, and the first section (21) is thermally connected to the side (12). The second segment (22) is connected to the first segment (21) to form a thermal conduction with the first segment (21), and the second segment (22) is thermally connected to the side surface (12).

2. The battery pack as described in claim 1, characterized in that, The liquid cooling plate (20) further includes a current collector (23), which is connected to the first segment (21), and the current collector (23) and the second segment (22) are arranged along the third direction (Z).

3. The battery pack as described in claim 1, characterized in that, The battery pack also includes a first adhesive layer (30), and the first segment (21) is bonded to the adjacent side surface (12) through the first adhesive layer (30); There is a gap between the second segment (22) and the adjacent side (12), or the second segment (22) and the adjacent side (12) are bonded together by the first adhesive layer (30).

4. The battery pack as described in claim 1, characterized in that, The first segment (21) and the second segment (22) are integrally formed structures. The second segment (22) has a cavity (221) inside. The cavity (221) extends along the first direction (X) and is isolated from the flow channel. Alternatively, the first segment (21) and the second segment (22) are integrally formed structures, and the second segment (22) is a solid structure.

5. The battery pack as described in claim 1, characterized in that, The battery pack also includes a housing (60) and a crossbeam (80), wherein the housing (60) has a receiving cavity; The battery pack (10) and the crossbeam (80) are both disposed in the receiving cavity. The crossbeam (80) is connected to the housing (60). The battery pack (10) includes two end faces (13) disposed opposite to each other along the first direction (X). At least one of the end faces (13) is connected to the crossbeam (80).

6. The battery pack as described in claim 5, characterized in that, The battery pack also includes a heat insulation plate (40); Along the first direction (X), the battery pack (10) includes a plurality of battery cells (11), and the heat insulation plate (40) is disposed between two adjacent battery cells (11); The heat insulation plate (40) includes a first surface (41) and a second surface (42) disposed opposite to each other along the first direction (X); At least one of the first surface (41) and the second surface (42) is provided with a first groove (43), the first groove (43) extends recessed from one of the first surface (41) or the second surface (42) toward the other, along the first direction (X) on a plane perpendicular to the first direction (X), the orthographic projection of the battery cell (11) covers the orthographic projection of the first groove (43).

7. The battery pack as described in claim 5, characterized in that, The battery pack also includes an insulating plate (50), which abuts against the crossbeam (80) and the end face (13). The insulating plate (50) has a second groove (51) on the side facing the battery pack (10) in the first direction (X). The second groove (51) and the end face (13) are arranged opposite to each other in the first direction (X).

8. The battery pack as described in claim 6, characterized in that, The battery cell (11) includes a first sidewall (111) and a second sidewall (112) arranged opposite to each other along the first direction (X), a third sidewall (113) and a fourth sidewall (114) arranged opposite to each other along the second direction (Y), and a bottom wall (115) and a top wall (116) arranged opposite to each other along the third direction (Z). The first sidewall (111), the third sidewall (113), the second sidewall (112) and the fourth sidewall (114) enclose a shell having openings at both ends along the third direction (Z). The bottom wall (115) and the top wall (116) respectively cover the openings at both ends of the shell in the third direction (Z). The first sidewall (111) and the second sidewall (112) are the sidewalls with the largest surface area; In the first direction (X), the first surface (41) is connected to the first sidewall (111) or the second sidewall (112) of the adjacent battery cell (11), and the second surface (42) is connected to the second sidewall (112) or the first sidewall (111) of the adjacent battery cell (11). In the second direction (Y), the third sidewall (113) and the fourth sidewall (114) are thermally connected to the adjacent liquid cooling plate (20), respectively.

9. The battery pack as claimed in claim 1, characterized in that, Along the third direction (Z), the maximum dimension of the side (12) is H3 mm, the maximum dimension of the first segment (21) is H1 mm, and the maximum dimension of the second segment (22) is H2 mm, satisfying: 0.1≤H2 / H3≤0.5, H1>H2.

10. The battery pack as claimed in claim 1, characterized in that, Along the first direction (X), the maximum size of the first segment (21) is greater than the maximum size of the battery pack (10); and / or, along the first direction (X), the maximum size of the first segment (21) is greater than the maximum size of the second segment (22).

11. The battery pack as claimed in claim 1, characterized in that, Along the two directions (Y), the maximum size of the second segment (22) is smaller than the maximum size of the first segment (21).

12. The battery pack as described in claim 5, characterized in that, The liquid cooling plate (20) is disposed in the receiving cavity, the first segment (21) extends through the crossbeam (80) along the first direction (X), and the second segment (22) is disposed on the side of the crossbeam (80) near the battery pack (10).

13. The battery pack as described in claim 5, characterized in that, The liquid cooling plate (20) is disposed in the receiving cavity, and the second section (22) is connected to the box body (60) and / or the crossbeam (80).

14. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 1 to 13.

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