Battery pack

Abstract

The utility model provides a battery pack. The battery pack comprises a shell as well as single batteries and a heat management component which are arranged in the shell, each single battery comprises a first wall, a second wall and a pole, the pole penetrates through the second wall, and the first wall is the largest wall; the heat management part comprises a first heat exchange body and a second heat exchange body, the first heat exchange body is in heat conduction connection with the first wall, and the second heat exchange body is in heat conduction connection with the pole and / or the second wall. Therefore, the heat management component is in heat conduction connection with the pole and the maximum wall of the battery monomer, and the battery monomer can be cooled through the two end parts of the battery monomer, so that the heat dissipation effect of the heat management component on the battery monomer is improved, and uniform heat dissipation of the battery monomer is realized; therefore, the phenomenon that the local temperature of the single battery is too high or too low is avoided, the capacity attenuation of the single battery is avoided, and the charge-discharge capacity and the service life of the single battery are effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery heat dissipation, in particular to a battery pack. Background Art

[0002] The battery cells in the power battery pack will generate heat during the charging and discharging process, causing the temperature of the battery cells to rise. If the temperature of the battery cells is too high, it will easily affect the charging and discharging capabilities of the battery cells, and even cause the battery cells to experience thermal runaway, causing the battery pack to catch fire and explode. Therefore, thermal management components are usually installed in the battery pack to control the temperature of the battery cells, ensure that the battery cells operate in a suitable temperature environment, and improve the safety of the battery cells during the charging and discharging process.

[0003] Currently, thermal management components are usually installed close to one surface of the battery cell. However, this thermal management structure has a poor heat dissipation effect on the battery cell and cannot achieve uniform heat dissipation of the battery cell. It is easy to cause the battery cell to have a local temperature that is too high or too low, thereby causing the battery cell capacity to decay, affecting the battery cell's charge and discharge capabilities and service life. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to at least solve the problem that the current battery pack cannot achieve uniform heat dissipation of the battery cells, thereby affecting the charge and discharge performance and service life of the battery cells.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] The utility model provides a battery pack, which has a first direction, a second direction and a third direction that intersect with each other in pairs, and the battery pack includes a shell and a battery cell and a thermal management component arranged in the shell; the battery cell includes a first wall, a second wall and a pole, the pole is passed through the second wall, the first wall intersects with the first direction, the second wall intersects with the third direction, and the first wall is the outer wall with the largest area of the battery cell; the thermal management component includes a first heat exchanger and a second heat exchanger, the first heat exchanger is thermally connected to the first wall, and the second heat exchanger is thermally connected to the second wall and / or the pole.

[0007] Optionally, the second heat exchanger is insulated from the pole.

[0008] Optionally, there are multiple battery cells, and the multiple battery cells are arranged in the shell along the first direction and / or the second direction; the first end includes a first wall, and the second end includes a second wall and a pole passing through the second wall; the battery pack also includes a connecting plate, which is connected to the poles of two adjacent battery cells, and the second heat exchanger is thermally connected to the connecting plate.

[0009] Optionally, along the third direction, the orthographic projection of the connecting piece on the plane where the second walls of the plurality of battery cells are located is located within the orthographic projection of the second heat exchanger on the plane where the second walls of the plurality of battery cells are located.

[0010] Optionally, the second heat exchanger is insulated from the connecting plate.

[0011] Optionally, the length directions of the connecting plate and the second heat exchanger are both extended along the first direction; the length direction of the first heat exchanger is extended along the second direction, and the first heat exchanger is arranged between two adjacent battery cells along the first direction, or the first heat exchanger is arranged between the battery cell at the upper edge in the first direction and the shell.

[0012] Optionally, the pole includes a first terminal and a second terminal with different polarities, and the first terminal and the second terminal are arranged on the second wall at intervals along the second direction; the second heat exchange body includes a first heat exchange section, a second heat exchange section and a third heat exchange section, the first heat exchange section and the third heat exchange section are arranged at intervals along the second direction and both extend along the first direction, and the second heat exchange section extends along the second direction and connects the first heat exchange section and the third heat exchange section; the first heat exchange section and the third heat exchange section are thermally connected to the first terminal and the second terminal of the battery cell respectively.

[0013] Optionally, the first heat exchanger has a first cavity, and the second heat exchanger has a second cavity; the battery pack further includes a heat exchange pipeline, the heat exchange pipeline has a third cavity, and the third cavity is connected to the first cavity and the second cavity.

[0014] Optionally, the battery pack further includes a first current collector, which is arranged on at least one side of the first heat exchanger along the second direction, and the heat exchange pipeline is connected to the first current collector; and / or, the battery pack further includes a second current collector, which is arranged on at least one side of the second heat exchanger along the first direction, and the heat exchange pipeline is connected to the second current collector.

[0015] Optionally, the first heat exchanger and the second heat exchanger are an integrated piece.

[0016] Optionally, at least a portion of the second heat exchanger bends and extends along the third direction toward the second wall, and is thermally connected to the second wall.

[0017] Optionally, the shell includes a bottom shell and an upper cover, the bottom shell has a accommodating cavity, the battery cell and the thermal management component are both arranged in the accommodating cavity, the upper cover is connected to the bottom shell and seals the accommodating cavity; the second heat exchanger is arranged on the upper cover.

[0018] Compared with the prior art, the battery pack described in the present invention has the following advantages:

[0019] In the battery pack of the present invention, the thermal management component includes a first heat exchanger and a second heat exchanger. The first heat exchanger is thermally connected to the first wall of the battery cell, and the second heat exchanger is thermally connected to the second wall and / or the pole of the battery cell. As a result, the thermal management component is thermally connected to the pole with greater thermal conductivity efficiency and the first wall with the largest heat exchange area of the battery cell, respectively, thereby improving the heat exchange efficiency and dissipating the heat of the battery cell through multiple heat transfer paths, which helps to improve the heat dissipation effect of the thermal management component on the battery cell and realize uniform heat dissipation of the battery cell in all directions, thereby avoiding the phenomenon of local temperature being too high or too low in the battery cell, avoiding the capacity attenuation of the battery cell, and effectively ensuring the charging and discharging capacity and service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is an exploded view of the structure of a battery pack in an embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the bottom shell of a battery pack in an embodiment of the present invention;

[0023] Figure 3 This is a top view of the bottom shell of a battery pack in an embodiment of the present invention;

[0024] Figure 4 In the embodiment of the present utility model Figure 3 Schematic diagram of the cross section along the AA direction;

[0025] Figure 5 In the embodiment of the utility model Figure 4 A partial enlarged schematic diagram;

[0026] Figure 6 In the embodiment of the present utility model Figure 3 Schematic diagram of the cross section along the BB direction;

[0027] Figure 7 This is a top view of the bottom shell of another battery pack in an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1-shell, 11-bottom shell, 110-accommodation cavity, 12-upper cover;

[0030] 2-battery cell, 201-first end, 202-second end, 21-first wall, 22-second wall, 220-terminal column;

[0031] 3-thermal management component, 31-first heat exchanger, 310-first cavity, 32-second heat exchanger, 320-second cavity, 321-first heat exchange section, 322-second heat exchange section, 323-third heat exchange section;

[0032] 4-connecting piece;

[0033] 5-heat exchange pipeline, 50-third cavity, 51-liquid inlet, 52-liquid outlet;

[0034] 6-first current collector, 7-second current collector. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] The terms "first," "second," and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, the term "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0037] In this application, the term "parallel" includes not only absolute parallelism but also the generally recognized parallelism in engineering practice, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. At the same time, "perpendicular" also includes not only absolute perpendicularity but also the generally recognized perpendicularity in engineering practice, such as "perpendicular" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only absolute equality but also the generally recognized equality in engineering practice, which may include a certain error, such as a tolerance range of -1% to 1%.

[0038] It should be understood that references throughout this specification to "some embodiments" mean that a particular feature, structure, or characteristic associated with an embodiment is included in at least one embodiment of the present invention. Therefore, the appearance of "in some embodiments" throughout this specification does not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0039] The following describes in detail a battery pack provided by the present invention by listing specific embodiments.

[0040] Reference Figures 1 to 3 An embodiment of the present invention provides a battery pack, which includes a shell 1 and a battery cell 2 and a thermal management component 3 arranged in the shell 1; the battery cell 2 includes a first end 201 and a second end 202, the first end 201 intersects with a first direction X, and the second end 202 intersects with a third direction Z; the thermal management component 3 includes a first heat exchanger 31 and a second heat exchanger 32, the first heat exchanger 31 is thermally connected to the first end 201, and the second heat exchanger 32 is thermally connected to the second end 202.

[0041] Specifically, if Figure 1 and Figure 2 As shown, the battery pack has a first direction X, a second direction Y, and a third direction Z that intersect with each other. In some embodiments, the first direction X, the second direction Y, and the third direction Z may be perpendicular to each other.

[0042] The battery pack includes a housing 1, battery cells 2, and a thermal management component 3. The housing 1 includes a bottom housing 11 and a top cover 12. The bottom housing 11 has a receiving cavity 110, within which the battery cells 2 and thermal management component 3 are located. The top cover 12 is fixedly connected to the bottom housing 11 to seal the receiving cavity 110, thereby protecting the battery cells 2 and thermal management component 3 within the receiving cavity 110 and preventing external moisture, dust, etc. from entering the receiving cavity 110 and causing corrosion to the battery cells 2 and thermal management component 3. The top cover 12 and the bottom housing 11 can be assembled and connected using fasteners such as bolts, screws, and rivets, or can be connected using snap-fit, adhesive, or other methods, as long as the connection between the top cover 12 and the bottom housing 11 is reliable. This embodiment does not impose any restrictions on this.

[0043] like Figure 1 As shown, the battery cell 2 includes a first end 201 and a second end 202. The first end 201 refers to a side wall of the battery cell 2 and intersects with a first direction X. The second end 202 refers to a top wall or a bottom wall of the battery cell 2. The top wall refers to the outer wall of the battery cell 2 near the upper cover 12, and the bottom wall refers to the outer wall of the battery cell 2 near the bottom of the bottom shell 11. The second end 202 intersects with a third direction Z. Because the battery pack includes multiple battery cells 2, each battery cell 2 may have different dimensions. Therefore, the angles at which the first end 201 of different battery cells 2 intersects with the first direction X may vary, and the angles at which the second end 202 of different battery cells 2 intersects with the third direction Z may vary. To facilitate the explanation of the present invention, in this embodiment, the first end 201 is parallel to the plane formed by the second direction Y and the third direction Z, and the second end 202 is parallel to the plane formed by the first direction X and the second direction Y.

[0044] The thermal management component 3 includes a first heat exchanger 31 and a second heat exchanger 32. The first heat exchanger 31 is thermally connected to the first end 201, and the second heat exchanger 32 is thermally connected to the second end 202. The thermal connection means that heat can be transferred between the first heat exchanger 31 and the first end 201, and heat can be transferred between the second heat exchanger 32 and the second end 202. The heat transfer can be performed by direct surface contact or indirect contact such as thermally conductive silicone sheets. The specific method is not limited in this embodiment. The first heat exchanger 31 and the second heat exchanger 32 can adopt liquid cooling heat exchange. A cooling medium flows inside the first heat exchanger 31 and the second heat exchanger 32. The cooling medium can absorb the heat generated by the battery cell 2 and carry the heat out of the battery pack as it circulates, thereby achieving heat dissipation of the battery cell 2. The cooling medium can be pure water, ethylene glycol aqueous solution, etc. The specific type is not limited in this embodiment.

[0045] In some optional embodiments, the second heat exchanger 32 can be provided on the upper cover 12 and fixedly connected to the upper cover 12 by means of adhesive connection, welding, etc., or the upper cover 12 can be directly designed as the second heat exchanger 32. The upper cover 12 has a cavity for circulating the cooling medium inside, so that the upper cover 12 not only has a protective function, but also has the function of dissipating heat and cooling the battery cell 2, thereby reducing the number of components required for the battery pack, controlling the processing cost of the battery pack, and further contributing to the lightweight design of the battery pack.

[0046] In summary, in the battery pack of the embodiment of the present invention, the thermal management component 3 includes a first heat exchanger 31 and a second heat exchanger 32. The first heat exchanger 31 is thermally connected to the first end 201 of the battery cell 2, and the second heat exchanger 32 is thermally connected to the second end 202 of the battery cell 2. As a result, the thermal management component 3 is thermally connected to the two ends of the battery cell 2 respectively, and the battery cell 2 can be dissipated through the two ends of the battery cell 2, and then the battery cell 2 can be dissipated from all directions, which helps to improve the heat dissipation effect of the thermal management component 3 on the battery cell 2, and realize uniform heat dissipation of the battery cell 2, thereby avoiding the phenomenon of local temperature being too high or too low in the battery cell 2, avoiding the capacity attenuation of the battery cell 2, and effectively ensuring the charging and discharging capacity and service life of the battery cell 2.

[0047] In some optional embodiments, referring to Figures 1 to 3 The first end 201 includes a first wall 21, the second end 202 includes a second wall 22 and a pole 220, and the pole 220 is disposed through the second wall 22; the first heat exchanger 31 is thermally connected to the first wall 21, and the second heat exchanger 32 is thermally connected to the pole 220.

[0048] Specifically, the first wall 21 is the two outer walls of the battery cell 2 that are opposite to each other along the first direction X. The first heat exchanger 31 is arranged close to the first wall 21 to achieve a heat conduction connection with the first wall 21. The second wall 22 is the two outer walls of the battery cell 2 that are opposite to each other along the third direction Z. A pole 220 is provided on one of the second walls 22. Figure 1 The figure shows a schematic diagram of a terminal 220 disposed on the second wall 22 near the upper cover 12. Of course, the terminal 220 can also be disposed on the second wall 22 near the bottom of the bottom shell 11. The specific arrangement depends on the requirements of the battery pack and is not limited to this embodiment. The second heat exchanger 32 can be disposed in close proximity to the terminal 220 or can be adhesively connected to the terminal 220, thereby achieving a thermal connection between the second heat exchanger 32 and the terminal 220.

[0049] It is understood that the connection between the terminal 220 and the internal pole core of the battery cell 2 enables a high degree of heat conduction within the battery cell 2. The second heat exchanger 32 is thermally connected to the terminal 220, allowing heat from the battery cell 2 to be conducted to the second heat exchanger 32 via the terminal 220. This high heat conduction efficiency improves the heat dissipation within the battery cell 2 through the second heat exchanger 32. Simultaneously, the first heat exchanger 31 is thermally connected to the first wall 21, enabling heat dissipation to the exterior of the battery cell 2. Thus, the thermal connection between the first heat exchanger 31 and the first wall 21, and the thermal connection between the second heat exchanger 32 and the terminal 220, enables simultaneous heat dissipation within and outside the battery cell 2, helping to maintain temperature consistency within and outside the battery cell 2. This further prevents localized overheating or overheating within the battery cell 2, thereby preventing capacity decay within the battery cell 2 and ensuring the charge and discharge capabilities and service life of the battery cell 2.

[0050] In some optional embodiments, the first heat exchanger 31 is insulated from the first wall 21, and the second heat exchanger 32 is insulated from the pole 220. Specifically, the surfaces of the first heat exchanger 31 and the second heat exchanger 32 can be coated with an insulating layer made of polyvinyl chloride, cross-linked polyethylene, etc., and the insulating connection is achieved through the insulating layer; or, a layer of insulating pads made of rubber, silicone, etc. can be provided between the first heat exchanger 31 and the first wall 21, and between the second heat exchanger 32 and the pole 220, and the insulating connection is achieved through the insulating pads. The first heat exchanger 31 is insulated from the first wall 21, and the second heat exchanger 32 is insulated from the pole 220 to prevent people from touching the first heat exchanger 31 or the second heat exchanger 32 without taking proper insulation measures and getting an electric shock, thereby reducing safety hazards during the use of the battery pack. Of course, if the first heat exchanger 31 and the second heat exchanger 32 are themselves made of insulating materials, they can themselves achieve an insulated connection with the first wall 21 or the pole 220, and there is no need to provide an insulating layer or insulating pad.

[0051] In some optional embodiments, referring to Figures 1 to 3 There are multiple battery cells 2, and the multiple battery cells 2 are arranged in the shell 1 along the first direction X and / or the second direction Y; the first end 201 includes a first wall 21, and the second end 202 includes a second wall 22 and a pole 220 passing through the second wall 22; the battery pack also includes a connecting piece 4, which is connected to the poles 220 of two adjacent battery cells 2 to electrically connect the multiple battery cells 2, and the second heat exchanger 32 is thermally connected to the connecting piece 4.

[0052] Specifically, multiple battery cells 2 are stacked and arranged in the accommodating cavity 110. The multiple battery cells 2 can be arranged along the first direction X or along the second direction Y to form a narrow and long battery pack; the multiple battery cells 2 can also be arranged in multiple rows and columns in the accommodating cavity 110 to form a rectangular or square battery pack.

[0053] like Figure 1 As shown, the connecting piece 4 is connected to the poles 220 of multiple battery cells 2. The connecting piece 4 can be made of copper bars, aluminum bars, etc., which have good conductivity and can realize the series or parallel connection of multiple battery cells 2. In order to ensure the reliability of the connection between the connecting piece 4 and the pole 220, laser welding can be used to achieve the connection between the connecting piece 4 and the pole 220. The connecting piece 4 can also effectively disperse and conduct the heat inside the battery cell 2 to avoid overheating inside the battery cell 2 and causing a decrease in its charging and discharging capacity. The second heat exchanger 32 is thermally connected to the connecting piece 4. The heat inside the battery cell 2 can be conducted to the second heat exchanger 32 through the connecting piece 4, thereby improving the heat dissipation effect inside the battery cell 2 through the second heat exchanger 32. Thus, through the thermal connection between the first heat exchanger 31 and the first wall 21 and the thermal connection between the second heat exchanger 32 and the connecting plate 4, synchronous heat dissipation inside and outside the battery cell 2 can be achieved, which helps to maintain the consistency of the internal and external temperatures of the battery cell 2, further avoid the phenomenon of local excessively high or low temperatures in the battery cell 2, avoid the capacity attenuation of the battery cell 2, and ensure the charging and discharging capabilities and service life of the battery cell 2.

[0054] Figures 4 to 6 The schematic cross-sectional views of the battery pack are shown in two different directions. Figures 4 to 6 In the figure, the connecting piece is connected to the pole 220 on the second wall 22, and the second heat exchanger 32 is thermally connected to the connecting piece 4. The pole 220, the connecting piece 4, and the second heat exchanger 32 form a heat conduction path. The heat inside the battery cell 2 is conducted to the connecting piece 4 through the pole 220, and then conducted to the second heat exchanger 32 through the connecting piece 4. During the heat conduction process, the heat is gradually absorbed and dispersed, and finally absorbed by the second heat exchanger 32 to a large extent, thereby achieving effective heat dissipation inside the battery cell 2.

[0055] In some optional embodiments, referring to Figures 1 to 3 Along the third direction Z, the orthographic projection of the connecting piece 4 on the plane where the second walls 22 of the multiple battery cells 2 are located is located within the orthographic projection of the second heat exchanger 32 on the plane where the second walls 22 of the multiple battery cells 2 are located, so that the second heat exchanger 32 covers the connecting piece 4, thereby maximizing the connection area between the second heat exchanger 32 and the connecting piece 4, and further helping to improve the heat dissipation effect of the second heat exchanger 32 on the inside of the battery cell 2 through the connecting piece 4.

[0056] In some optional embodiments, the second heat exchanger 32 is insulated from the connecting piece 4. Specifically, the surface of the second heat exchanger 32 may be coated with an insulating layer made of polyvinyl chloride, cross-linked polyethylene, or the like, to achieve an insulated connection. Alternatively, an insulating pad made of rubber, silicone, or the like may be interposed between the second heat exchanger 32 and the connecting piece 4 to achieve an insulated connection. The second heat exchanger 32 is insulated from the connecting piece 4 to prevent electric shock from occurring if a person touches the second heat exchanger 32 without proper insulation measures, thereby reducing safety hazards during battery pack use.

[0057] In some optional embodiments, referring to Figures 1 to 3 The length directions of the connecting piece 4 and the second heat exchanger 32 both extend along the first direction X, wherein the length direction of the connecting piece 4 and the second heat exchanger 32 refers to the direction in which the connecting piece 4 and the second heat exchanger 32 are the largest. Specifically, the first wall 21 of the battery cell 2 is the outer wall with the largest area of the battery cell 2, that is, the first wall 21 is the largest surface of the battery cell 2. As a result, the number of battery cells 2 stacked and arranged in the first direction X is greater. If the second wall 22 of the battery cell 2 is provided with a pole 220, the distance between the poles 220 on two adjacent battery cells 2 is smaller. Extending the length directions of the connecting piece 4 and the second heat exchanger 32 along the first direction X can increase the number of battery cells 2 that can be connected to the connecting piece 4 to a certain extent, allowing the connecting piece 4 to connect to more poles 220, while increasing the utilization of heat transfer between the second heat exchanger 32 and the connecting piece 4, thereby improving the uniform heat dissipation effect of the second heat exchanger 32 on multiple battery cells 2.

[0058] At the same time, the length direction of the first heat exchanger 31 extends along the second direction Y. The length direction of the first heat exchanger 31 refers to the direction in which the first heat exchanger 31 has the largest size. The first heat exchanger 31 is provided between two adjacent battery cells 2 along the first direction X, and is in close contact with the battery cells 2 on both sides, and can dissipate heat from the battery cells 2 on both sides at the same time. Alternatively, the first heat exchanger 31 is provided between the battery cell 2 located at the edge and the housing 1 in the first direction X, and the first heat exchanger 31 is in close contact with the battery cell 2, and dissipates heat from the battery cell 2 located at the edge. Figure 1 and Figure 2 As shown, multiple battery cells 2 are stacked in rows and columns, and the first heat exchanger 31 can be in close contact with multiple rows or columns of multiple battery cells 2 at the same time to achieve synchronous heat dissipation of multiple battery cells 2 and improve heat dissipation efficiency.

[0059] In some optional embodiments, referring to Figure 5The pole 220 includes a first terminal and a second terminal with different polarities, and the first terminal and the second terminal are spaced apart along the second direction Y on the second wall 22 of the battery cell 2. In other words, it can be understood that the battery cell 2 includes two poles 220, one of which is a positive pole and the other is a negative pole, and the two poles 220 are spaced apart along the second direction Y on the second wall 22.

[0060] Further, refer to Figure 2 and Figure 3 The second heat exchange body 32 includes a first heat exchange section 321, a second heat exchange section 322 and a third heat exchange section 323, wherein the first heat exchange section 321 and the third heat exchange section 323 are arranged at intervals along the second direction Y and both extend along the first direction X, the second heat exchange section 322 extends along the second direction Y, one end of the second heat exchange section 322 is connected to the first heat exchange section 321, and the other end is connected to the third heat exchange section 323, so that the second heat exchange body 32 has a "U"-shaped structure. In some embodiments, the second heat exchanger 32 can be set as an integrally molded structure, and the first heat exchange section 321, the second heat exchange section 322 and the third heat exchange section 323 are respectively different parts of the second heat exchanger 32, which eliminates the connection process between the first heat exchange section 321, the second heat exchange section 322 and the third heat exchange section 323, which helps to control the processing cost of the second heat exchanger 32. At the same time, the integrally molded structure can effectively ensure the connection reliability between the first heat exchange section 321, the second heat exchange section 322 and the third heat exchange section 323, thereby extending the service life of the second heat exchanger 32.

[0061] The first heat exchange section 321 and the third heat exchange section 323 are thermally connected to the first terminal and the second terminal of the battery cell 2 respectively, so that the poles 220 of different polarities of each battery cell 2 are connected to the same second heat exchange body 32. This is beneficial to improving the uniform heat dissipation of each battery cell 2 by the second heat exchange body 32, improving the temperature uniformity of the battery cell 2, and facilitating the layout of the second heat exchange body 32, thereby reducing the design difficulty of the battery pack.

[0062] In some optional embodiments, referring to Figure 5 and Figure 6 The first heat exchanger 31 has a first cavity 310 for circulating the cooling medium. The first cavity 310 can be a whole large cavity or divided into a plurality of interconnected small cavities. The second heat exchanger 32 has a second cavity 320 for circulating the cooling medium. The second cavity 320 can be a whole large cavity or divided into a plurality of interconnected small cavities. Figure 5 and Figure 6 Schematic diagrams showing that the first cavity 310 and the second cavity 320 are divided into multiple interconnected small chambers are shown, which facilitates the uniform circulation of the cooling medium, thereby improving the uniformity of heat dissipation of the battery cell 2 by the first heat exchanger 31 and the second heat exchanger 32.

[0063] Reference Figure 1 and Figure 6 The battery pack also includes a heat exchange line 5, which has a third cavity 50 for circulating a cooling medium. The third cavity 50 communicates with the first cavity 310 and the second cavity 320, enabling circulation of the cooling medium within the heat exchange line 5 and the first and second heat exchangers 31 and 32. The heat exchange line 5 includes a liquid inlet 51 and a liquid outlet 52. The liquid inlet 51 delivers low-temperature cooling medium to the first and second heat exchangers 31 and 32. As the low-temperature cooling medium flows within the first and second cavities 310 and 320, it absorbs heat generated by the battery cells 2 and increases in temperature. The high-temperature cooling medium is then discharged from the battery pack through the liquid outlet 52, thereby dissipating heat and cooling the battery cells 2. To prevent leakage of the cooling medium, a sealing ring or the like may be provided at the connection between the third cavity 50 and the first and second cavities 310 and 320 to achieve a sealed connection between the third cavity 50 and the first and second cavities 310 and 320.

[0064] In some optional embodiments, referring to Figure 1 and Figure 7 The battery pack also includes a first current collector 6, which is arranged on at least one side of the first heat exchanger 31 along the second direction Y, and the heat exchange pipeline 5 is connected to the first current collector 6; and / or, the battery pack also includes a second current collector 7, which is arranged on at least one side of the second heat exchanger 32 along the first direction X, and the heat exchange pipeline 5 is connected to the second current collector 7.

[0065] Specifically, the first fluid collector 6 is connected to the plurality of first heat exchangers 31. The inner cavity of the first fluid collector 6 communicates with the first cavities 310 of the plurality of first heat exchangers 31. The third cavity 50 of the heat exchange pipeline 5 communicates with the inner cavity of the first fluid collector 6. During liquid inflow, the cooling medium in the third cavity 50 flows into the inner cavity of the first fluid collector 6 and then flows through the inner cavity of the first fluid collector 6 to the first cavities 310 of each first heat exchanger 31. During liquid outflow, the cooling medium in the first cavity 310 of each first heat exchanger 31 flows into the inner cavity of the first fluid collector 6 and then flows through the inner cavity of the first fluid collector 6 to the third cavity 50 of the heat exchange pipeline 5, thereby achieving the flow of the cooling medium. The first fluid collector 6 can be disposed on one side of the first heat exchanger 31 along the second direction Y to achieve single-sided inflow and outflow of the cooling medium, or it can be disposed on opposite sides of the first heat exchanger 31 along the second direction Y to achieve double-sided inflow and outflow of the cooling medium.

[0066] like Figure 1 As shown, there can be multiple second current collectors 7, and each second heat exchanger 32 is connected to two second current collectors 7. In this way, the cooling medium in the multiple second heat exchangers 32 can flow independently, and the heat dissipation between the second ends of adjacent battery cells 2 is not easily affected. Figure 7 As shown, the second fluid collector 7 can be one or two, and each second fluid collector 7 is connected to multiple second heat exchangers 32. In this way, the cooling medium in the inner cavity of the second fluid collector 7 can flow to the multiple second heat exchangers 32, thereby realizing the mutual flow of the cooling medium in the multiple second heat exchangers 32, which is more conducive to improving the uniformity of heat dissipation.

[0067] In some optional embodiments, the first heat exchanger 31 and the second heat exchanger 32 are integrated, that is, the first heat exchanger 31 and the second heat exchanger 32 are different parts of the thermal management component 3. This arrangement helps improve the structural stability of the thermal management component 3, thereby extending the service life of the thermal management component 3. Of course, in other optional embodiments, the first heat exchanger 31 and the second heat exchanger 32 can be connected to each other using a water tap plug. This plug-in method is simple and easy to operate, which helps to simplify the installation of the battery pack.

[0068] In some optional embodiments, on the basis of the thermal connection between the second heat exchanger 32 and the pole 220 or the connecting piece 4 on the second wall 22 of the battery cell, at least a portion of the second heat exchanger 32 is further bent and extended along the third direction Z toward the second wall 22 of the battery cell 2, and is thermally connected to the second wall 22, thereby increasing the contact area between the second heat exchanger 32 and the battery cell 2, and further helping to improve the heat dissipation effect of the second heat exchanger 32 on the battery cell 2.

[0069] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

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. The battery pack comprises a housing (1), and a battery cell (2) and a thermal management component (3) disposed in the housing (1). The battery cell (2) comprises a first wall (21), a second wall (22) and a pole (220), wherein the pole (220) is provided through the second wall (22), the first wall (21) intersects with the first direction (X), the second wall (22) intersects with the third direction (Z), and the first wall (21) is the outer wall with the largest area of the battery cell (2); The heat management component (3) comprises a first heat exchanger (31) and a second heat exchanger (32), wherein the first heat exchanger (31) is thermally connected to the first wall (21), and the second heat exchanger (32) is thermally connected to the second wall (22) and / or the pole (220).

2. The battery pack according to claim 1, wherein: The second heat exchanger (32) is also insulated and connected to the pole (220).

3. The battery pack according to claim 1, wherein: There are a plurality of battery cells (2), and the plurality of battery cells (2) are arranged in the housing (1) along the first direction (X) and / or the second direction (Y); The first wall (21) is connected to the second wall (22); The battery pack further comprises a connecting piece (4), the connecting piece (4) connecting the poles (220) of two adjacent battery cells (2), and the second heat exchanger (32) is thermally connected to the connecting piece (4).

4. The battery pack according to claim 3, characterized in that: Along the third direction (Z), the orthographic projection of the connecting piece (4) on the plane where the second walls (22) of the plurality of battery cells (2) are located is located within the orthographic projection of the second heat exchange body (32) on the plane where the second walls (22) of the plurality of battery cells (2) are located.

5. The battery pack according to claim 3, wherein: The second heat exchanger (32) is insulated and connected to the connecting piece (4).

6. The battery pack according to claim 3, characterized in that: The length directions of the connecting piece (4) and the second heat exchanger (32) are both extended along the first direction (X); The length direction of the first heat exchanger (31) extends along the second direction (Y), and the first heat exchanger (31) is arranged between two adjacent battery cells (2) along the first direction (X), or the first heat exchanger (31) is arranged between the battery cell (2) at the upper edge of the first direction (X) and the shell (1).

7. The battery pack according to claim 1, wherein: The pole (220) comprises a first terminal and a second terminal with different polarities, the first terminal and the second terminal being spaced apart and arranged on the second wall (22) along the second direction (Y); The second heat exchange body (32) comprises a first heat exchange section (321), a second heat exchange section (322) and a third heat exchange section (323); the first heat exchange section (321) and the third heat exchange section (323) are spaced apart along the second direction (Y) and both extend along the first direction (X); the second heat exchange section (322) extends along the second direction (Y) and connects the first heat exchange section (321) and the third heat exchange section (323); The first heat exchange section (321) and the third heat exchange section (323) are respectively thermally connected to the first terminal and the second terminal of the battery cell (2).

8. The battery pack according to claim 1, wherein: The first heat exchanger (31) has a first cavity (310), and the second heat exchanger (32) has a second cavity (320); The battery pack further comprises a heat exchange pipeline (5), wherein the heat exchange pipeline (5) has a third cavity (50), and the third cavity (50) is in communication with the first cavity (310) and the second cavity (320).

9. The battery pack according to claim 8, characterized in that: The battery pack further comprises a first current collector (6), the first current collector (6) being arranged on at least one side of the first heat exchanger (31) along the second direction (Y), and the heat exchange pipeline (5) being connected to the first current collector (6); And / or, the battery pack further includes a second current collector (7), the second current collector (7) is arranged on at least one side of the second heat exchange body (32) along the first direction (X), and the heat exchange pipeline (5) is connected to the second current collector (7).

10. The battery pack according to claim 1, wherein: The first heat exchanger (31) and the second heat exchanger (32) are an integral part.

11. The battery pack according to claim 1 or 3, characterized in that: At least a portion of the second heat exchange body (32) bends and extends along the third direction (Z) toward the second wall (22), and is heat-conductingly connected to the second wall (22).

12. The battery pack according to claim 1, wherein: The housing (1) comprises a bottom shell (11) and an upper cover (12); the bottom shell (11) has a receiving cavity (110); the battery cell (2) and the thermal management component (3) are both arranged in the receiving cavity (110); the upper cover (12) is connected to the bottom shell (11) and covers the receiving cavity (110); The second heat exchanger (32) is arranged on the upper cover (12).

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