Battery pack

Abstract

The utility model provides a battery pack which comprises a plurality of single batteries which are arranged in a stacked manner and extend along a first direction; part of the heat management component is arranged among the plurality of battery monomers in a penetrating manner and is in contact with the surfaces of the plurality of battery monomers; and the heat exchange layer is connected to at least one side of the plurality of single batteries along the first direction, and the heat exchange layer is a phase change material layer. According to the battery pack disclosed by the invention, through the arrangement of the heat management part and the heat exchange layer made of the phase-change material, the battery pack can be effectively cooled when the battery pack is in a high-temperature environment, and a heat preservation effect can be provided for the battery pack when the battery pack is in a low-temperature environment, so that the working temperature of the battery pack can be maintained within a normal range, and the service life of the battery pack is prolonged. The charging and discharging performance of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack heat management, in particular to a battery pack. BACKGROUND

[0002] At present, the battery pack mainly composed of lithium battery modules is favored by the industry due to its high energy density and energy conversion efficiency. Most of the battery packs used on the market only consider the heat dissipation of the battery pack in a high temperature environment, and do not take into account the heat preservation in a low temperature environment, which affects the charge and discharge performance and service life of the battery pack. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a battery pack to at least solve the problem that the battery pack in the prior art cannot take into account the heat dissipation in a high temperature environment and the heat preservation in a low temperature environment, which affects the charge and discharge performance and service life of the battery pack.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] The present application provides a battery pack, which comprises: a plurality of battery monomers, the plurality of battery monomers are stacked and arranged, wherein the plurality of battery monomers are arranged along a first direction; a heat management component, part of the heat management component is arranged between the plurality of battery monomers and is in contact with the surface of the plurality of battery monomers; and a heat exchange layer connected to at least one side of the plurality of battery monomers along the first direction, the heat exchange layer being a phase change material layer.

[0006] Optionally, the battery pack further comprises a support, the support is arranged at both ends of the plurality of battery monomers along the first direction, and the support is used for supporting the plurality of battery monomers; and the heat exchange layer is connected to the side of the support away from the plurality of battery monomers.

[0007] Optionally, the battery pack further comprises a busbar, the busbar is connected to the side of the support away from the plurality of battery monomers; and the heat exchange layer covers the busbar.

[0008] Optionally, the battery pack further comprises an information acquisition board and a control board, the information acquisition board is arranged at least one side of the plurality of battery monomers along a second direction and is fixedly connected with the support, the information acquisition board is further electrically connected with the busbar and is used for acquiring the temperature parameter of the busbar; the control board is electrically connected with the information acquisition board and is used for controlling the working state of the battery pack according to the temperature parameter; wherein the second direction intersects with the first direction.

[0009] Optionally, part of the busbar is bent to form a connecting portion extending along the first direction, and the connecting portion is connected with the information acquisition board.

[0010] Optionally, the connecting portion is provided with a recess structure.

[0011] Optionally, the battery pack further comprises a shell; the shell has a receiving cavity, the plurality of battery monomers, the thermal management component and the heat exchange layer are all arranged in the receiving cavity, and the receiving cavity is filled with a heat-conducting adhesive.

[0012] Optionally, the thermal management component comprises a liquid cooling pipe and a flow collecting pipe; the liquid cooling pipe is arranged between the plurality of battery monomers and in contact with the surfaces of the plurality of battery monomers, the liquid cooling pipe is provided with a cooling liquid flow channel for the flow of cooling liquid, the flow collecting pipe is arranged at at least one end of the liquid cooling pipe along the second direction and fixedly connected with the liquid cooling pipe, the flow collecting pipe is used for providing the cooling liquid for the liquid cooling pipe, and the side of the flow collecting pipe away from the liquid cooling pipe is also in abutment with the shell.

[0013] Optionally, the battery monomers are cylindrical batteries, the liquid cooling pipe is arranged in a meandering manner along the second direction to form a plurality of arc-shaped grooves, and at least part of each cylindrical battery is arranged in one arc-shaped groove.

[0014] Optionally, the liquid cooling pipe is provided with a heating sheet, and the heating sheet is electrically connected with the control board.

[0015] Optionally, the surface of the information acquisition board is flush with the surface of the support, the surface of the support is provided with an insulating pad, the insulating pad is in abutment with the shell, so as to realize the electrical isolation between the information acquisition board and the shell.

[0016] Optionally, the shell is provided with a heat dissipation fin, and the projection of the heat dissipation fin along the second direction is located within the projection of the battery monomers along the second direction.

[0017] Optionally, the plurality of battery monomers form at least two battery groups, and at least two battery groups are arranged at intervals along the first direction; the heat exchange layer is further arranged between every two adjacent battery groups and connected with the end faces of the adjacent two battery groups.

[0018] Compared with the prior art, the battery pack has the following advantages:

[0019] The battery pack can effectively dissipate heat when the battery pack is in a high-temperature environment, and can provide heat preservation when the battery pack is in a low-temperature environment, so as to maintain the working temperature of the battery pack within a normal range, improve the charge-discharge performance of the battery pack, and prolong the service life of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the present application, and are incorporated herein for purposes of illustrating the preferred embodiments of the present application and explaining the principles of the present application. In the drawings:

[0021] Figure 1 is a schematic view of an appearance of a battery pack in an embodiment of the present application;

[0022] Figure 2 is an exploded view of a structure of a battery pack in an embodiment of the present application;

[0023] Figure 3 is a schematic view of a battery pack without a shell in an embodiment of the present application;

[0024] Figure 4 is a schematic view of another battery pack without a shell in an embodiment of the present application;

[0025] Figure 5 is a schematic view of a heat management component in an embodiment of the present application;

[0026] Figure 6 is a side view of a battery pack in an embodiment of the present application;

[0027] Figure 7 is a top view of a battery pack in an embodiment of the present application.

[0028] Explanation of reference signs:

[0029] 1 - battery monomer, 2 - heat exchange layer, 3 - heat management component, 31 - liquid cooling pipe, 32 - current collecting pipe, 33 - arc-shaped groove, 34 - heating sheet, 4 - support, 5 - busbar, 51 - connecting part, 52 - recessed structure, 6 - information acquisition board, 7 - control board, 8 - shell, 81 - upper cover, 82 - bottom shell, 83 - sealing ring, 84 - heat dissipation fin, 9 - insulating pad, X - first direction, Y - second direction, Z - third direction. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0031] The terms "first", "second", and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of the terms so construed can interchange depending on the context in which it is used and the intention of the person of ordinary skill in the art would be to use the term in the context of the description of the application. The data so used are interchangeable under appropriate circumstances and the embodiments of the application described herein can be practiced in other than the illustrated orders so long as the recited claims are appropriately interpreted. It will also be understood that the objects include one or several objects.

[0032] The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0033] A battery pack provided by the present application is described in detail below by listing specific embodiments.

[0034] With reference to Figure 1 and Figure 2 A battery pack provided by the embodiments of the present application comprises: a plurality of battery monomers 1, the plurality of battery monomers 1 are arranged in a stack, wherein the plurality of battery monomers 1 are arranged in extension along a first direction X; a thermal management component 3, part of the thermal management component 3 is arranged between the plurality of battery monomers 1 and is in contact with the surface of the plurality of battery monomers 1; and a heat exchange layer 2, connected to at least one side of the plurality of battery monomers 1 along the first direction X, the heat exchange layer 2 is a phase change material layer.

[0035] Specifically, Figure 1 A schematic diagram of the appearance of a battery pack in the embodiments of the present application is shown, Figure 2 A structural explosion diagram of a battery pack in the embodiments of the present application is shown, as Figures 1 to 2 The plurality of battery monomers 1 are arranged in a stack along a second direction Y and a third direction Z, the plurality of battery monomers 1 are arranged in extension along a first direction X, and the plurality of battery monomers 1 are used as points to achieve the charging and discharging function of the battery pack. Part of the thermal management component 3 is arranged between the plurality of battery monomers 1 along the first direction X and is in contact with the surface of the plurality of battery monomers 1. The thermal management component 3 has a circulating cooling liquid therein, and the cooling liquid can absorb part of the heat generated by the battery monomers 1 during operation to achieve heat dissipation of the battery monomers 1.

[0036] As Figure 2 shown, the heat exchange layer 2 is arranged at least one side of the plurality of battery monomers 1 along the first direction X, and the heat exchange layer 2 can be made of a phase change material, which is a material capable of phase change (such as conversion between solid and liquid) in a specific temperature range, and these materials can absorb or release a large amount of latent heat during the phase change process, thereby effectively storing or releasing heat energy, wherein the process of material changing physical properties is called phase change process, and the absorption or release of latent heat mainly occurs in the phase change process.

[0037] When the battery pack works in a high-temperature environment, the heat dissipation and cooling of the battery pack mainly depend on the heat management component 3, and on this basis, part of the heat generated by the working of the battery monomers 1 is transferred to the heat exchange layer 2 made of a phase change material, and the heat exchange layer 2 can release the heat, thereby providing a good working environment for the battery pack and improving the charge and discharge performance of the battery pack. When the battery pack works in a low-temperature environment, part of the heat generated by the working of the battery monomers 1 is quickly neutralized by the surrounding cold air, and part of the heat is conducted to the heat exchange layer 2, and the heat exchange layer 2 can store the heat, provide certain heat preservation for the battery pack, and at the same time, the heat exchange layer 2 can also release certain heat to maintain the working temperature of the battery pack in a normal range, reduce the influence of the too low environmental temperature on the charge and discharge performance of the battery pack, and help to improve the reliability and safety of the working of the battery pack.

[0038] Therefore, the battery pack of the embodiment of the application can effectively dissipate heat for the battery pack when the battery pack is in a high-temperature environment, and can provide heat preservation for the battery pack when the battery pack is in a low-temperature environment, so as to maintain the working temperature of the battery pack in a normal range, help to improve the charge and discharge performance of the battery pack, and prolong the service life of the battery pack. In addition, the heat management component 3 can realize efficient heat dissipation of the outer circumferential surface of the battery monomer 1, and the heat exchange layer 2 can realize efficient heat dissipation and heat preservation of the two ends of the battery monomer 1, so as to help to improve the uniform heat dissipation of the battery monomer 1 by the combined use of the heat management component and the phase change material, and further improve the heat dissipation effect.

[0039] Optionally, referring to Figure 1 and Figure 2 , the battery pack of the embodiment of the application further comprises a support 4, the support 4 is arranged at both ends of the plurality of battery monomers 1 along the first direction X, and the support 4 is used for supporting the plurality of battery monomers 1; and the heat exchange layer 2 is connected to the side of the support 4 away from the plurality of battery monomers 1.

[0040] Specifically, the support 4 is made of hard plastic, alloy, metal or other materials with good strength and rigidity, and is arranged at both ends of the plurality of battery monomers 1 along the first direction X to support and fix the plurality of battery monomers 1, thereby improving the stability of the battery monomers 1. In some embodiments, the support 4 is provided with a plurality of mounting grooves for inserting the battery monomers 1, and the ends of the battery monomers 1 are embedded in the mounting grooves to realize the connection between the battery monomers 1 and the support 4.

[0041] The heat exchange layer 2 is connected to the side of the support 4 away from the plurality of battery monomers 1. In this embodiment, the surface of the support 4 away from the battery monomers 1 is a plane, and the heat exchange layer 2 is connected to the support 4, which is more convenient for the smooth connection of the heat exchange layer 2, and can ensure that the heat exchange layer 2 is in full contact with the surface of the support 4, thereby improving the reliability of the connection between the heat exchange layer 2 and the support 4. Further, in this embodiment, the heat exchange layer 2 is fixed to the surface of the support 4 by pasting. In this connection mode, no connecting holes or connecting parts need to be provided on the support 4 and the heat exchange layer 2, which helps to maintain the structural integrity of the support 4 and the heat exchange layer 2, reduces the processing difficulty of the support 4 and the heat exchange layer 2, and further simplifies the connection mode of the support 4 and the heat exchange layer 2.

[0042] Optionally, referring to Figure 3 and Figure 4 , the battery pack of the present application further comprises a busbar 5 connected to the side of the support 4 away from the plurality of battery monomers 1, and the heat exchange layer 2 covers the busbar 5.

[0043] Specifically, Figure 3 and Figure 4 respectively show a schematic view of a battery pack without a shell 8 in the present application, wherein, Figure 3 the busbar 5 is exposed, Figure 4 the busbar 5 is connected to the side of the support 4 away from the plurality of battery monomers 1 and covers the busbar 5. The busbar 5 is mainly used for the connection and management of the plurality of battery monomers 1. During the charging and discharging process of the battery pack, the busbar 5 can uniformly distribute the current to make the working state of each battery unit close to uniform, thereby preventing the battery pack from overcharging or overdischarging. In addition, the busbar 5 can also help the plurality of battery monomers 1 to dissipate heat, reduce the accumulation of heat generated by the flow of current, and thereby prolong the service life of the battery pack.

[0044] The heat exchange layer 2 covers the busbar 5 in the embodiment of the present application. The heat generated in the charging and discharging process of the battery monomer 1 is conducted to the busbar 5, and then conducted to the heat exchange layer 2 through the busbar 5. When the battery pack works in a high-temperature environment, the heat exchange layer 2 can release the heat to achieve the heat dissipation and cooling of the battery pack. When the battery pack works in a low-temperature environment, the heat exchange layer 2 can store the heat to achieve the heat preservation of the battery pack. Therefore, the charging and discharging performance of the battery pack is improved, and the reliability and safety of the battery pack are improved.

[0045] Optionally, with reference to Figures 2 to 4 The battery pack of the embodiment of the present application further comprises an information acquisition board 6 and a control board 7. The information acquisition board 6 is arranged on at least one side of the plurality of battery monomers 1 along the second direction Y and is fixedly connected with the support 4. The information acquisition board 6 is also electrically connected with the busbar 5 and is used for acquiring the temperature parameter of the busbar 5. The control board 7 is electrically connected with the information acquisition board 6 and is used for controlling the working state of the battery pack according to the temperature parameter. The second direction Y intersects the first direction X.

[0046] Specifically, the information acquisition board 6 is arranged on one side or both sides of the plurality of battery monomers 1 along the second direction Y. The arrangement is specifically made according to actual needs. The second direction Y intersects the first direction X. Figures 3 to 4 The second direction Y is perpendicular to the first direction X in the specific embodiment shown in the figure. The “perpendicular” includes not only the absolute perpendicular condition, but also the approximately perpendicular condition in the general cognition. For example, the angle between the first direction X and the second direction Y is 89°-91°, which is also regarded as the perpendicular between the first direction X and the second direction Y. The control board 7 is electrically connected with the information acquisition board 6. The control board 7 can be arranged on one side of the battery monomer 1 along the third direction Z, or arranged on one side of the battery monomer 1 along the first direction X or the second direction Y. The arrangement is adaptively designed according to the internal structure of the battery pack, which is not limited in the embodiment of the present application.

[0047] The information acquisition board 6 and the support 4 can be fixedly connected through fasteners, welding, adhesive connection, limit clamping and the like. In the embodiment of the present application, the information acquisition board 6 and the support 4 are respectively provided with connecting holes. The fasteners such as screws and rivets are arranged in the connecting holes to achieve the fixed connection of the information acquisition board 6 and the support 4. In this way, the connection reliability of the information acquisition board 6 and the support 4 can be ensured, and the disassembly and maintenance of the information acquisition board 6 and the support 4 are facilitated.

[0048] The information acquisition board 6 is provided with integrated circuits and different types of sensors, which are electrically connected with the busbar 5, and can acquire temperature parameters, current parameters and voltage parameters on the busbar 5. The temperature parameters, current parameters and voltage parameters on the busbar 5 reflect the working states of the plurality of battery monomers 1. The control board 7 is a component part of the battery management system, and is electrically connected with the information acquisition board 6, and can acquire the temperature parameters, current parameters and voltage parameters acquired by the information acquisition board 6, so as to control the working states of the battery pack according to the above parameters. For example, if the temperature of the busbar 5 acquired by the information acquisition board 6 is high, the control board 7 can control the flow rate of the cooling liquid in the thermal management component 3 to be accelerated, or control the charging and discharging rate of the battery monomer 1 to be reduced, so as to gradually reduce the temperature of the busbar 5, thereby maintaining the normal working of the battery pack, avoiding the over-temperature of the battery pack, and even avoiding the thermal runaway of the battery pack, and improving the safety of the working of the battery pack.

[0049] Optionally, referring to Figure 3 and Figure 4 , in the battery pack of the embodiment of the application, part of the busbar 5 is bent to form a connecting part 51 extending along the first direction X, and the connecting part 51 is connected with the information acquisition board 6, so as to realize the electrical connection between the busbar 5 and the information acquisition board 6. In this connection mode, the busbar 5 and the information acquisition board 6 are electrically connected in a direct contact mode, and do not rely on the switching of other components, so as to reduce the probability of the electrical connection failure between the busbar 5 and the information acquisition board 6 to a certain extent.

[0050] Optionally, referring to Figure 3 and Figure 4 , in the battery pack of the embodiment of the application, the connecting part 51 is provided with a recess structure 52. Based on most battery pack products, the busbar 5 needs to be vertically bent to form a connecting part 51 which can smoothly connect the busbar 5 and the information acquisition board 6. However, the vertical bending is easy to cause large stress concentration, and even cause the fracture phenomenon. Therefore, the recess structure 52 is arranged on the connecting part 51 in the embodiment of the application. The recess structure 52 can be formed by bending, so that the connecting part 51 is not straight. The recess structure 52 can provide a certain deformation space for the connecting part 51 under the condition of being pulled, so as to improve the deformation ability of the connecting part 51, thereby helping to improve the stress concentration condition of the connecting part 51, and avoiding the fracture of the connecting part 51.

[0051] Optionally, referring to Figure 1 and Figure 2 , the battery pack of the embodiment of the application further comprises a shell 8. The shell 8 has a containing cavity, and the plurality of battery monomers 1, the thermal management component 3 and the heat exchange layer 2 are arranged in the containing cavity. The containing cavity is filled with a heat-conducting adhesive.

[0052] Specifically, the shell 8 has a containing cavity, and the plurality of battery monomers 1, the thermal management component 3 and the heat exchange layer 2 are arranged in the containing cavity. Specifically, the shell 8 includes a bottom shell 82 and an upper cover 81, the bottom shell 82 has the containing cavity, the containing cavity penetrates one end of the bottom shell 82, and the upper cover 81 is arranged at the end of the bottom shell 82 and is fixedly connected with the bottom shell 82, so that the closed containing cavity is formed between the upper cover 81 and the bottom shell 82, and water vapor, dust and the like in the external environment can be prevented from entering the containing cavity, thereby better protecting the battery monomers 1, the thermal management component 3 and the heat exchange layer 2 in the containing cavity, and further helping to prolong the service life of the battery pack. Wherein, the bottom shell 82 and the upper cover 81 can be assembled and connected together through fasteners such as bolts, screws, rivets and the like, or can be clamped together through a buckle structure and the like, so as to facilitate disassembly and assembly of the upper cover 81 and the bottom shell 82, thereby facilitating maintenance and repair of the battery pack.

[0053] Further, as shown in Figure 2 , a sealing ring 83 is further arranged between the upper cover 81 and the bottom shell 82, the sealing ring 83 is processed from materials such as silica gel, rubber, polyurethane and epoxy resin, and can seal the gap between the upper cover 81 and the bottom shell 82, thereby further enhancing the waterproof and dustproof effect of the shell 8 and improving the protection of the shell 8 on the battery monomers 1, the thermal management component 3 and the heat exchange layer 2.

[0054] The containing cavity is filled with thermal conductive glue, which includes gaps between the plurality of battery monomers 1 and the shell 8, between the plurality of battery monomers 1, between the plurality of battery monomers 1 and the thermal management component 3, and between the thermal management component 3 and the heat exchange layer 2, and the thermal conductive glue can quickly conduct the heat generated by the battery monomers 1, helping to improve the heat dissipation effect of the battery pack. The thermal conductive glue also has good electrical insulation, which helps to ensure the electrical safety inside the battery pack. The thermal conductive glue also has good adhesion, which helps to achieve close connection between the battery monomers 1 and the thermal management component 3 and between the thermal management component 3 and the shell 8, thereby improving the structural stability of the battery pack.

[0055] Optionally, referring to Figure 2 and Figure 5 , in the battery pack of the embodiment of the application, the thermal management component 3 includes a liquid cooling pipe 31 and a flow collecting pipe 32; the liquid cooling pipe 31 is arranged between the plurality of battery monomers 1 and is in contact with the surface of the plurality of battery monomers 1, and the liquid cooling pipe 31 is provided with a cooling liquid flow channel for the cooling liquid to flow; the flow collecting pipe 32 is arranged at at least one end of the liquid cooling pipe 31 along the second direction Y and is fixedly connected with the liquid cooling pipe 31, and the flow collecting pipe 32 is used to provide cooling liquid for the liquid cooling pipe 31; the side of the flow collecting pipe 32 away from the liquid cooling pipe 31 also abuts against the shell 8.

[0056] Specifically, Figure 5 a schematic diagram of a thermal management component 3 in the embodiment of the application is shown, as Figure 5As shown, the heat management component 3 includes a liquid cooling pipe 31 and a manifold 32, the liquid cooling pipe 31 is in contact with the surface of the plurality of battery monomers 1, the liquid cooling pipe 31 has a cooling liquid flow channel inside, and the cooling liquid takes away part of the heat generated by the battery monomer 1 during the flow in the cooling liquid flow channel, so as to realize the heat dissipation of the battery pack. The manifold 32 is arranged at least one end of the liquid cooling pipe 31 along the second direction Y and is fixedly connected with the liquid cooling pipe 31. The manifold 32 and the liquid cooling pipe 31 can be fixedly connected by assembly connection, welding or the like. The manifold 32 and the liquid cooling pipe 31 can also be processed into an integral piece by an integral molding process, and the specific connection mode is not limited by the embodiment of the application. The manifold 32 is used to provide cooling liquid for the liquid cooling pipe 31. If the manifold 32 is arranged at one end of the liquid cooling pipe 31, it is equivalent to that the heat management component 3 adopts the mode of unilateral inlet and outlet of cooling liquid. If the manifold 32 is arranged at one end of the liquid cooling pipe 31, it is equivalent to that the heat management component 3 adopts the mode of bilateral inlet and outlet of cooling liquid.

[0057] The side of the manifold 32 away from the liquid cooling pipe 31 protrudes from the surface of the information collection plate 6 and abuts against the shell 8, so that the heat absorbed by the liquid cooling pipe 31 can be transmitted to the shell 8 through the manifold 32 and diffused to the external environment through the shell 8, thereby forming a complete heat transfer path to transmit the heat inside the battery pack to the external environment, thereby further improving the heat dissipation effect of the heat management component 3 on the battery pack.

[0058] Optionally, referring to Figure 6 , Figure 6 A side sectional view of a battery pack in an embodiment of the application is shown. In the battery pack of the embodiment of the application, the battery monomer 1 is a cylindrical battery, the liquid cooling pipe 31 is arranged in a meandering manner along the second direction Y to form a plurality of arc-shaped grooves 33, at least part of each cylindrical battery is accommodated in one arc-shaped groove 33, the arc-shaped groove 33 can increase the contact area between the liquid cooling pipe 31 and the battery monomer 1, thereby improving the heat dissipation effect of the heat management component 3 on the battery monomer 1. In addition, the arc-shaped groove 33 can also play a certain limiting and supporting role for the battery monomer 1, thereby improving the structural stability of the plurality of battery monomers 1.

[0059] Optionally, referring to Figure 5The battery pack in the embodiment of the present application is provided with a heating sheet 34 on the liquid cooling pipe 31, and the heating sheet 34 is electrically connected with the control board 7. The liquid cooling pipe 31 body can be made of metal or alloy material such as aluminum sheet, and the heating sheet 34 is fixedly connected with the liquid cooling pipe 31 body, which can be pasted on the liquid cooling pipe 31 body. The heating sheet 34 is electrically connected with the control board 7. When the battery pack works in a low-temperature environment, the low temperature is not conducive to the charging and discharging of the battery monomer 1. Therefore, in the early stage of charging and discharging, the control board 7 can control the heating sheet 34 to heat the battery pack to a preset temperature, so as to improve the temperature in the battery pack, thereby helping to improve the charging and discharging performance of the battery monomer 1. When the control board 7 detects that the temperature in the battery pack reaches the optimal temperature for the battery monomer 1 to work, the heating sheet 34 is controlled to stop heating, and the battery monomer 1 performs normal charging and discharging action, which helps to prolong the service life of the battery pack. In addition, the liquid cooling pipe 31 and the heating sheet 34 are combined together in the embodiment of the present application, which helps to reduce the space occupied by the liquid cooling pipe 31 and the heating sheet 34 in the battery pack, and improve the integration design of the battery pack.

[0060] Optionally, referring to Figure 3 In the battery pack in the embodiment of the present application, the surface of the information acquisition board 6 is flush with the surface of the support 4. The surface of the support 4 refers to the surface of the support 4 arranged opposite in the second direction Y. The surface of the support 4 is provided with an insulating pad 9, and the side of the insulating pad 9 away from the surface of the support 4 is in abutment with the shell 8, so as to realize electrical isolation between the information acquisition board 6 and the shell 8, and prevent the battery pack from short circuit.

[0061] Optionally, referring to Figure 1 and Figure 7 In the battery pack in the embodiment of the present application, the shell 8 is provided with a heat dissipation fin 84, Figure 7 Fig. 1 shows a top view of a battery pack in the embodiment of the present application. As shown in Figure 7 The heat dissipation fin 84 is in a sawtooth structure, which can effectively increase the surface area of the shell 8. The heat dissipation fin 84 is arranged corresponding to the battery monomer 1, and the projection of the heat dissipation fin 84 in the second direction Y is located in the projection of the battery monomer 1 in the second direction Y, so that the surface area of the part of the shell 8 corresponding to the battery monomer 1 is large, that is, the heat diffusion area is increased, which helps to improve the heat exchange efficiency, and further improves the heat dissipation effect on the battery monomer 1.

[0062] Optionally, referring to Figure 2In the battery pack of the embodiments of the present application, the plurality of battery cells 1 form at least two battery groups, and the at least two battery groups are arranged at intervals along the first direction X; the heat exchange layer 2 is further arranged between every two adjacent battery groups and connected with the end faces of the two adjacent battery groups, that is, the heat exchange layer 2 is connected with the end faces of the battery cells 1 of the two adjacent battery groups, so as to improve the heat preservation capacity of the heat exchange layer 2 for each battery group. Of course, the number of the battery groups is determined according to the power specification of the battery pack, and the more the number of the battery groups is, the more the number of the heat exchange layers 2 can be increased correspondingly to ensure the heat preservation capacity.

[0063] It should be understood that the reference herein to“some embodiments” means that a particular feature, structure, or characteristic relating to an embodiment is included in at least one embodiment of the present application. Therefore, the“in some embodiments” appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0064] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that, The battery pack includes: Multiple battery cells (1) are stacked together, wherein the multiple battery cells (1) are arranged extending along a first direction (X); A thermal management component (3) is partially disposed between multiple battery cells (1) and in contact with the surfaces of multiple battery cells (1); A heat exchange layer (2) is connected to at least one side of the plurality of battery cells (1) along the first direction (X), and the heat exchange layer (2) is a phase change material layer; The thermal management component (3) includes a liquid cooling pipe (31) and a manifold (32). The liquid cooling pipe (31) passes through the plurality of battery cells (1) and contacts the surface of the plurality of battery cells (1). The liquid cooling pipe (31) is provided with a coolant flow channel for supplying coolant. The manifold (32) is located at at least one end of the liquid cooling pipe (31) along the second direction (Y) and is fixedly connected to the liquid cooling pipe (31). The manifold (32) is used to provide the coolant to the liquid cooling pipe (31). The second direction (Y) intersects with the first direction (X).

2. The battery pack according to claim 1, characterized in that, The battery pack also includes a bracket (4); The bracket (4) is disposed at both ends of the plurality of battery cells (1) along the first direction (X), and the bracket (4) is used to support the plurality of battery cells (1). The heat exchange layer (2) is connected to the side of the bracket (4) away from the plurality of battery cells (1).

3. The battery pack according to claim 2, characterized in that, The battery pack also includes a bus (5); The busbar (5) is connected to the side of the bracket (4) away from the plurality of battery cells (1); the heat exchange layer (2) covers the busbar (5).

4. The battery pack according to claim 3, characterized in that, The battery pack also includes an information acquisition board (6) and a control board (7); The information acquisition board (6) is disposed on at least one side of the plurality of battery cells (1) along the second direction (Y) and is fixedly connected to the bracket (4). The information acquisition board (6) is also electrically connected to the busbar (5) for collecting the temperature parameters of the busbar (5). The control board (7) is electrically connected to the information acquisition board (6) and is used to control the working state of the battery pack according to the temperature parameters.

5. The battery pack according to claim 4, characterized in that, The busbar (5) is partially bent to form a connecting part (51) extending along the first direction (X), and the connecting part (51) is connected to the information acquisition board (6).

6. The battery pack according to claim 5, characterized in that, The connecting part (51) is provided with a recessed structure (52).

7. The battery pack according to claim 4, characterized in that, The battery pack also includes a housing (8); The housing (8) has a cavity in which multiple battery cells (1), thermal management components (3) and heat exchange layer (2) are disposed, and the cavity is filled with thermally conductive adhesive.

8. The battery pack according to claim 7, characterized in that, The side of the manifold (32) away from the liquid cooling pipe (31) also abuts against the housing (8).

9. The battery pack according to claim 8, characterized in that, The battery cell (1) is a cylindrical battery, and the liquid cooling pipe (31) is arranged along the second direction (Y) to form a plurality of arc-shaped grooves (33), and at least a portion of each cylindrical battery is accommodated in one of the arc-shaped grooves (33).

10. The battery pack according to claim 8, characterized in that, The liquid cooling pipe (31) is provided with a heating element (34), which is electrically connected to the control board (7).

11. The battery pack according to claim 7, characterized in that, The surface of the information acquisition board (6) is flush with the surface of the bracket (4). The surface of the bracket (4) is provided with an insulating pad (9). The insulating pad (9) abuts against the housing (8) to achieve electrical isolation between the information acquisition board (6) and the housing (8).

12. The battery pack according to claim 7, characterized in that, The housing (8) is provided with heat dissipation fins (84), and the projection of the heat dissipation fins (84) along the second direction (Y) is located within the projection of the battery cell (1) in the second direction (Y).

13. The battery pack according to claim 1, characterized in that, Multiple battery cells (1) form at least two battery packs, and the at least two battery packs are spaced apart along the first direction (X); The heat exchange layer (2) is also provided between each two adjacent battery packs and is connected to the end faces of the two adjacent battery packs.

Images