Cooling assembly and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a cooling assembly and a battery pack, the cooling assembly has a first direction, a second direction and a third direction which are intersected pairwise, is suitable for heat exchange with a battery and a busbar, and is characterized by comprising a box body and a busbar cover body. A battery containing cavity is formed in the box body and used for containing a battery, and a first opening is formed in one side, in the third direction, of the box body and used for exposing an electrode terminal of the battery. The busbar cover body is used for covering one side, far away from the battery accommodating cavity, of the busbar, and the busbar is connected with an electrode terminal of the battery. And phase change cooling materials are arranged on the cavity wall of the battery accommodating cavity and the busbar cover body. The battery and the busbar can be cooled at the same time, the cooling effect can be further improved, efficient heat exchange is achieved, and heat generated in the battery in the high-rate charging process is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a cooling assembly and a battery pack. BACKGROUND

[0002] With the rapid development of electric vehicle technology and energy storage field, the performance of secondary batteries as core energy storage elements directly affects the performance of the whole vehicle or energy storage system. With the increasing demand for fast charging technology in the market, high-rate charging has become an important research direction in the field of battery technology. However, a large amount of heat will be generated inside the battery during high-rate charging, which will lead to a sharp rise in battery temperature if not dissipated in time and effectively, affecting the service life and performance of the battery, and even causing safety problems such as thermal runaway.

[0003] Traditional battery thermal management systems mainly use air cooling or liquid cooling medium for heat dissipation. The air cooling system has simple structure and low cost, but the heat dissipation efficiency is limited, which is difficult to meet the heat dissipation demand under high-rate charging conditions. While the liquid cooling system has high heat dissipation efficiency, but the system is complex, occupies large space, and has high requirements for the insulation and air tightness of the cooling liquid, which increases the complexity and cost of the system. In addition, the heat generated during the heat dissipation process of these traditional heat dissipation methods is mostly directly discharged into the environment, which cannot realize energy recovery and reuse, and is not conducive to energy saving and efficient use. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides a cooling assembly and a battery pack to solve the problem of low heat dissipation efficiency and high requirements of the battery cooling system.

[0005] In a first aspect, the present application provides a cooling assembly having a first direction, a second direction and a third direction intersecting with each other, suitable for heat exchange with a battery and a busbar, comprising a box body and a busbar cover. The inside of the box body is provided with a battery accommodating cavity, which is used to accommodate the battery, and the box body is provided with a first opening on one side along the third direction, which is used for the exposure of the electrode terminal of the battery. The busbar cover is used to cover the side of the busbar away from the battery accommodating cavity, and the busbar is connected with the electrode terminal of the battery. Wherein, the phase change cooling material is arranged on the cavity wall of the battery accommodating cavity and the busbar cover.

[0006] Beneficial effects: The cooling assembly can simultaneously cool the battery and the busbar, which can further improve the cooling effect. Through the phase change cooling material arranged on the cavity wall of the battery accommodating cavity and the busbar cover, efficient heat exchange is realized, the heat generated in the battery during high-rate charging is effectively reduced, thereby prolonging the service life of the battery, improving the cycle stability and overall performance of the battery. In addition, this design also helps to reduce the safety hazards caused by overheating, such as thermal runaway or fire, thereby enhancing the safety and reliability of the battery pack.

[0007] In an alternative embodiment, the battery accommodating cavities are arranged in multiple numbers and sequentially arranged along the first direction; the busbar cover has two rows, and the two rows of busbar covers are distributed on the two opposite sides of the first opening along the second direction, each row of busbar covers includes one or more busbar covers, each busbar cover extends along the first direction, and each busbar cover is provided with the phase change cooling material.

[0008] Beneficial effects: By arranging multiple battery accommodating cavities in the box, the cooling assembly can simultaneously accommodate and cool multiple batteries, significantly improving the heat dissipation efficiency and the utilization rate of the cooling assembly. This design enables each battery in the battery pack to be fully cooled, avoiding local overheating and helping to maintain the uniformity of the internal temperature of the battery pack. In addition, the arrangement of multiple battery accommodating cavities also facilitates the expansion and maintenance of the battery pack, improving the flexibility and maintainability of the system.

[0009] In an alternative embodiment, the phase change cooling material is arranged on the inner side of the battery accommodating cavity and the busbar cover.

[0010] Beneficial effects: The battery outer side wall abuts against the inner side of the battery accommodating cavity, and the inner side of the busbar cover abuts against the busbar, and by arranging the phase change cooling material on the inner side of the battery accommodating cavity and the busbar cover, the close contact between the battery and the busbar and the phase change cooling material is ensured, and the heat exchange efficiency is improved. This design enables the heat generated by the battery and the busbar to be quickly transferred to the phase change cooling material and absorbed and stored, thereby reducing the temperature rise of the battery and the busbar.

[0011] In an alternative embodiment, the inner surface of the cavity wall of the battery accommodating cavity is provided with a first adhesive layer for bonding the battery; and the busbar cover is provided with a second adhesive layer on the side facing the battery accommodating cavity along the third direction, and the second adhesive layer is used to bond the busbar.

[0012] Wherein, the first adhesive layer and the second adhesive layer are composed of an adhesive and the phase change cooling material.

[0013] Beneficial effects: By placing the phase change cooling material in the battery containing cavity and the busbar cover's adhesive layer, the heat exchange efficiency is improved, and the battery containing cavity, busbar cover and battery can be tightly attached, enhancing the structural stability.

[0014] In an alternative embodiment, the phase change cooling material is coated on the inner surface of the cavity wall of the battery containing cavity and the side of the busbar cover facing the battery containing cavity in the third direction.

[0015] Beneficial effects: Coating the phase change cooling material on the inner side of the battery containing cavity and the busbar cover can achieve direct contact of the phase change cooling material with the battery and busbar, while facilitating the placement of the phase change cooling material.

[0016] In an alternative embodiment, the cavity wall of the battery containing cavity and the busbar cover are both hollow structures with internal cavities, and the phase change cooling material is filled in the internal cavities of the cavity wall of the battery containing cavity and the busbar cover.

[0017] Beneficial effects: By placing the phase change cooling material in the internal cavities of the battery containing cavity and the busbar cover, the phase change cooling material can be effectively fixed and prevented from falling off.

[0018] In an alternative embodiment, the phase change cooling material is set as a microcapsule phase change material.

[0019] Beneficial effects: The use of microcapsule phase change material as phase change cooling material not only improves the stability and durability of the material, but also makes the phase change process more uniform and controllable. Microcapsule technology helps to reduce leakage and degradation of phase change material during cyclic use, thereby prolonging the service life of the cooling assembly. In addition, microcapsule phase change material has faster thermal response speed and higher thermal storage density, which can more effectively absorb and release heat, further improving the cooling effect.

[0020] In an alternative embodiment, a cold plate is further included, which is arranged on the other side of the box in the third direction, and the other side of the box in the third direction is provided with a second opening, and the cold plate is adapted to exchange heat with the outer wall of the battery exposed to the second opening.

[0021] Beneficial effects: The addition of a cold plate design in the cooling assembly provides an additional heat dissipation path for the battery. The cold plate can quickly absorb the heat generated by the battery and dissipate the heat to the environment through its efficient heat dissipation mechanism. This design further enhances the cooling effect, especially suitable for battery packs in high-power application scenarios. At the same time, the use of the cold plate helps to reduce the temperature rise rate of the battery and improve the thermal stability and reliability of the battery pack.

[0022] In a second aspect, the application also provides a battery pack comprising a battery, a busbar and a cooling assembly.

[0023] The battery is provided with a plurality of batteries arranged in sequence along the first direction. The busbar comprises a plurality of intermediate busbars, and the electrode terminals of any two adjacent batteries are respectively electrically connected to one intermediate busbar. The plurality of batteries are respectively arranged in a plurality of battery accommodating cavities of the cooling assembly, and the intermediate busbars are adapted to abut against a busbar cover plate of the cooling assembly.

[0024] Beneficial effects: The provided battery pack integrates the above-mentioned efficient cooling assembly, achieving efficient heat dissipation of the battery and the busbar. This design enables the battery pack to maintain a relatively low temperature level under high-rate charging conditions, thereby prolonging the service life of the battery and improving the performance of the battery. At the same time, the efficient heat dissipation system also helps to reduce the performance degradation and safety hazards of the battery pack in high-temperature environments, improving the reliability and safety of the battery pack.

[0025] In an alternative embodiment, the busbar further comprises two output-stage busbars electrically connected to the two batteries located at the two ends along the first direction, and the output-stage busbars comprise a connecting portion electrically connected to the electrode terminals of the batteries and a bending portion bent from the first direction to the box body of the cooling assembly, and the connecting portion abuts against the busbar cover.

[0026] Beneficial effects: The structure and connection mode of the intermediate busbar and the output-stage busbar enable the plurality of batteries to be sequentially connected in series and form a complete battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Fig. 1 FIG. 1 is a structural schematic diagram of a cooling assembly according to an embodiment of the present application;

[0029] Fig. 2 FIG. 2 is an exploded view of the cooling assembly according to the embodiment of the present application.

[0030] Legend of the drawings:

[0031] 1, box; 2, battery; 3, busbar cover; 4, cold plate; 5, intermediate busbar; 6, output stage busbar; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0033] The embodiments of the present application are described below in combination with Figs. 1-2 .

[0034] According to the embodiments of the present application, in one aspect, a cooling assembly is provided, having a first direction X, a second direction Y, and a third direction Z intersecting with each other, adapted to exchange heat with a battery 2 and a busbar, comprising a box 1 and a busbar cover 3. The inside of the box 1 is provided with a battery accommodating cavity, which is used to accommodate the battery 2, so that the outer side wall of the battery 2 is in close contact with the inner surface of the battery accommodating cavity, thereby realizing heat exchange. The box 1 is provided with a first opening on one side along the third direction Z, which is used for the exposure of the electrode terminal of the battery 2. The busbar cover 3 is used to cover the side of the busbar away from the battery accommodating cavity, and the busbar is connected with the electrode terminal of the battery 2. Wherein, the phase change cooling material is arranged on the cavity wall of the battery accommodating cavity and the busbar cover 3.

[0035] In the present embodiment, the cooling assembly can simultaneously cool the battery 2 and the busbar, which can further improve the cooling effect. Through the phase change cooling material arranged on the cavity wall of the battery accommodating cavity and the busbar cover 3, efficient heat exchange is realized, which effectively reduces the heat generated inside the battery during high-rate charging, thereby prolonging the service life of the battery, improving the cycle stability and overall performance of the battery. In addition, this design also helps to reduce the safety hazards caused by overheating, such as thermal runaway or fire, etc., thereby enhancing the safety and reliability of the battery pack.

[0036] It should be noted that by arranging the busbar cover 3 on the busbar, the electrolyte leakage of the battery can be effectively prevented, and the influence of the effluent on the battery 2 when the explosion-proof valve is blown can also be effectively prevented.

[0037] In some embodiments, the battery accommodating cavities are arranged in multiple rows along the first direction X; the busbar cover body 3 has two rows of busbar cover bodies 3, which are arranged on two opposite sides of the first opening along the second direction Y, each row of busbar cover bodies 3 includes one or more busbar cover bodies 3, each busbar cover body 3 extends along the first direction X, and each busbar cover body 3 is provided with phase change cooling material.

[0038] Optionally, the busbar cover bodies 3 on one side can be an integral strip-shaped structure or a segmented structure.

[0039] Optionally, one battery 2 or two batteries 2 can be arranged in a single battery accommodating cavity.

[0040] Optionally, the multiple batteries 2 are arranged side by side along the first direction X, and the positive and negative electrodes of any two adjacent batteries 2 are inverted with respect to each other, so that the positive electrode of one battery 2 is adjacent to the negative electrode of another battery 2.

[0041] In this embodiment, by arranging multiple battery accommodating cavities in the box body 1, the cooling assembly can accommodate and cool multiple batteries 2 at the same time, significantly improving the heat dissipation efficiency and the utilization rate of the cooling assembly. This design ensures that each battery 2 in the battery pack can be fully cooled, avoiding local overheating and helping to maintain the uniformity of the internal temperature of the battery pack. In addition, the arrangement of multiple battery accommodating cavities also facilitates the expansion and maintenance of the battery pack, improving the flexibility and maintainability of the system.

[0042] In some embodiments, the battery accommodating cavities and the inner sides of the busbar cover bodies 3 are provided with phase change cooling material.

[0043] In this embodiment, the outer side wall of the battery 2 abuts against the inner side of the battery accommodating cavity, and the inner side of the busbar cover body 3 abuts against the busbar, and by arranging the phase change cooling material on the inner sides of the battery accommodating cavities and the busbar cover bodies, the close contact between the batteries 2 and the busbar and the phase change cooling material is ensured, and the heat exchange efficiency is improved. This design enables the heat generated by the batteries 2 and the busbar to be quickly transferred to the phase change cooling material and absorbed and stored, thereby reducing the temperature rise of the batteries 2 and the busbar.

[0044] In some embodiments, the inner surface of the cavity wall of the battery accommodating cavity is provided with a first adhesive layer for bonding the battery 2, and the busbar cover body 3 is provided with a second adhesive layer on the side facing the battery accommodating cavity along the third direction Z for bonding the busbar. The first adhesive layer and the second adhesive layer are both composed of an adhesive and phase change cooling material.

[0045] In this embodiment, by arranging the phase change cooling material in the adhesive layer of the battery accommodating cavities and the busbar cover bodies 3, the heat exchange efficiency is improved, and at the same time, the close fit of the battery accommodating cavities, the busbar cover bodies and the batteries is achieved, and the structural stability is enhanced.

[0046] In some embodiments, the phase change cooling material is coated on the inner surface of the cavity wall of the battery accommodation cavity and the side of the busbar cover 3 facing the battery accommodation cavity in the third direction Z. The side of the busbar cover 3 facing the battery accommodation cavity in the third direction Z is the inner surface of the busbar cover 3.

[0047] In this embodiment, coating the phase change cooling material on the inner surfaces of the battery accommodation cavity and the busbar cover can achieve direct contact of the phase change cooling material with the battery and the busbar, and facilitate the arrangement of the phase change cooling material.

[0048] Optionally, the cavity wall of the battery accommodation cavity and the busbar cover 3 are both hollow structures with internal cavities, and the phase change cooling material is filled in the internal cavities of the cavity wall of the battery accommodation cavity and the busbar cover 3.

[0049] In this embodiment, by arranging the phase change cooling material in the internal cavities of the battery accommodation cavity and the busbar cover, the phase change cooling material can be effectively fixed to prevent it from falling off.

[0050] Optionally, the phase change cooling material is arranged in the cavity wall of the battery accommodation cavity and the busbar cover 3. That is, the microcapsule phase change material is doped when the box body 1 and the busbar cover 3 are produced, providing a new arrangement method of the phase change cooling material.

[0051] Optionally, the phase change cooling material is arranged as a microcapsule phase change material.

[0052] In this embodiment, the microcapsule phase change material is selected as the phase change cooling material, which not only improves the stability and durability of the material, but also makes the phase change process more uniform and controllable. The microcapsule technology helps to reduce the leakage and degradation of the phase change material during the recycling process, thereby prolonging the service life of the cooling assembly. In addition, the microcapsule phase change material has faster thermal response speed and higher thermal storage density, which can more effectively absorb and release heat, further improving the cooling effect.

[0053] In some embodiments, a cold plate 4 is further included, which is arranged on the other side of the box body 1 in the third direction Z, and the other side of the box body 1 in the third direction Z is provided with a second opening, and the cold plate 4 is adapted to exchange heat with the outer wall of the battery 2 exposed to the second opening.

[0054] In this embodiment, the cold plate 4 is added in the cooling assembly to provide an additional heat dissipation path for the battery 2. The cold plate 4 can quickly absorb the heat generated by the battery 2 and dissipate the heat to the environment through its efficient heat dissipation mechanism. This design further enhances the cooling effect, especially suitable for battery packs in high-power application scenarios. At the same time, the use of the cold plate 4 helps to reduce the temperature rise rate of the battery 2, improve the thermal stability and reliability of the battery pack. In the case where the cooling effect is not high, the structure of the cold plate 4 can be omitted to further reduce the cost and improve the weight energy density of the battery pack.

[0055] According to an embodiment of the present application, in another aspect, a battery pack is also provided, comprising a battery 2, a busbar and a cooling assembly.

[0056] The battery 2 is provided with a plurality of batteries 2 arranged in sequence along the first direction X. The busbar includes a plurality of intermediate busbars 5, and the electrode terminals of any two adjacent batteries 2 are respectively electrically connected to one intermediate busbar 5. The plurality of batteries 2 are respectively arranged in a plurality of battery accommodating cavities of the cooling assembly, and the intermediate busbar 5 is adapted to abut against the busbar cover plate of the cooling assembly.

[0057] In this embodiment, the battery pack provided integrates the above-mentioned efficient cooling assembly, realizing efficient heat dissipation of the battery 2 and the busbar. This design enables the battery pack to maintain a relatively low temperature level under high-rate charging conditions, thereby prolonging the service life of the battery and improving the performance of the battery. At the same time, the efficient heat dissipation system also helps to reduce the performance degradation and safety hazards of the battery pack in high-temperature environments, improving the reliability and safety of the battery pack.

[0058] In some embodiments, the busbar further includes output stage busbars 6, which are provided with two and are respectively electrically connected to the two batteries 2 located at both ends along the first direction X, and the output stage busbar 6 includes a connecting portion 61 electrically connected to the electrode terminal of the battery and a bending portion 62 bent toward the box body 1 of the cooling assembly from the first direction X, and the connecting portion 61 abuts against the busbar cover 3.

[0059] In this embodiment, the structure and connection mode of the intermediate busbar 5 and the output stage busbar 6 enable the plurality of batteries 2 to be sequentially connected in series and form a complete battery pack.

[0060] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. Cooling assembly having a first direction (X), a second direction (Y) and a third direction (Z) intersecting two by two, adapted to exchange heat with a battery (2) and a busbar, characterized in that, The cooling assembly comprises: a box (1) internally provided with battery accommodating cavities for accommodating the batteries (2), the box (1) being provided with a first opening on one side in the third direction (Z) for exposing electrode terminals of the batteries (2); busbar covers (3) for covering the buses away from the battery accommodating cavities, the buses being connected with the electrode terminals of the batteries (2); wherein the cavity walls of the battery accommodating cavities and the busbar covers (3) are both provided with phase change cooling materials.

2. The cooling assembly according to claim 1, wherein: the battery accommodating cavities are arranged in multiple and sequentially in the first direction (X); the busbar covers (3) are arranged in two rows, the two rows of busbar covers (3) being distributed on two opposite sides of the first opening in the second direction (Y), each row of busbar covers (3) comprising one or more busbar covers (3), each busbar cover (3) extending in the first direction (X), and each busbar cover (3) being provided with the phase change cooling material.

3. The cooling assembly according to claim 1, wherein: the phase change cooling material is arranged on the inner sides of the battery accommodating cavities and the busbar covers (3).

4. The cooling assembly according to claim 3, wherein: the inner surfaces of the cavity walls of the battery accommodating cavities are provided with first adhesive layers for bonding the batteries (2); one side of the busbar covers (3) facing the battery accommodating cavities in the third direction (Z) is provided with second adhesive layers for bonding the buses; wherein the first adhesive layers and the second adhesive layers are both composed of adhesive and the phase change cooling material.

5. The cooling assembly according to claim 3, wherein: the phase change cooling material is coated on the inner surfaces of the cavity walls of the battery accommodating cavities and the side of the busbar covers (3) facing the battery accommodating cavities in the third direction (Z).

6. The cooling assembly according to claim 1, wherein: the cavity walls of the battery accommodating cavities and the busbar covers (3) are both hollow structures with internal cavities, and the phase change cooling material is filled in the internal cavities of the cavity walls of the battery accommodating cavities and the busbar covers (3).

7. The cooling assembly according to claim 1, wherein: the phase change cooling material is arranged as microcapsule phase change material.

8. The cooling assembly of claim 1, wherein, Further comprising: a cold plate (4) arranged on the other side of the box (1) in the third direction (Z), and the other side of the box (1) in the third direction (Z) is provided with a second opening, the cold plate (4) being adapted to exchange heat with the outer wall of the batteries (2) exposing the second opening.

9. A battery pack characterized by comprising: The cooling assembly comprises: batteries (2) arranged in multiple, the multiple batteries (2) being sequentially arranged in the first direction (X); buses comprising intermediate buses (5), the intermediate buses (5) being arranged in multiple, the electrode terminals of any two adjacent batteries (2) being respectively electrically connected with one intermediate bus (5); The cooling assembly of any one of claims 1 to 8, wherein a plurality of the batteries (2) are respectively arranged in a plurality of battery accommodating cavities of the cooling assembly, and the intermediate busbar (5) is adapted to abut against a busbar cover plate of the cooling assembly.

10. The battery pack of claim 9, wherein, The busbar further comprises: Output stage busbars (6) are provided with two, and are respectively electrically connected with two batteries (2) located at both ends along the first direction (X), and two output stage busbars (6) comprise a connecting portion (61) electrically connected with the electrode terminal of the battery and a bending portion (62) folded to the box (1) of the cooling assembly by the first direction (X), and the connecting portion (61) abuts against the busbar cover (3).

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