Battery pack

Abstract

This invention relates to the field of battery technology and proposes a battery pack. The battery pack includes an insulating support, a liquid cooling pipe, and at least two batteries. The insulating support includes a heat insulation portion located between two adjacent batteries. At least a portion of the outer periphery of each battery is housed within the heat insulation portion, and at least a portion of the outer periphery of each battery exposed outside the heat insulation portion contacts the liquid cooling pipe. By providing an insulating support with its heat insulation portion located between two adjacent batteries and at least a portion of the battery's outer periphery housed within the heat insulation portion, the heat insulation capability between the batteries can be improved. Simultaneously, since at least a portion of the battery's outer periphery exposed outside the heat insulation portion contacts the liquid cooling pipe, the liquid cooling effect of the liquid cooling pipe on the batteries can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery pack. Background Technology

[0002] In related technologies, liquid cooling is required for the battery to prevent it from overheating. However, the close proximity of adjacent batteries leads to rapid heat transfer, and a short circuit can easily cause thermal runaway. Summary of the Invention

[0003] This invention provides a battery pack that improves the heat insulation between batteries while ensuring liquid cooling effect.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention provides a battery pack including an insulating support, a liquid cooling pipe and at least two batteries. The insulating support includes a heat insulation portion located between two adjacent batteries. At least a portion of the outer periphery of each battery is housed in the heat insulation portion, and at least a portion of the outer periphery of each battery exposed outside the heat insulation portion is in contact with the liquid cooling pipe.

[0006] The battery pack provided by the present invention improves the heat insulation capability between batteries by setting an insulating support, with the heat insulation part of the insulating support located between two adjacent batteries and at least a portion of the outer periphery of the battery being accommodated in the heat insulation part. At the same time, since at least a portion of the outer periphery of the battery exposed outside the heat insulation part is in contact with the liquid cooling pipe, the liquid cooling effect of the liquid cooling pipe on the battery can be guaranteed. Attached Figure Description

[0007] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0008] Figure 1 This is a partial structural diagram of the battery pack provided in this embodiment;

[0009] Figure 2 This is a partial structural schematic diagram of the battery pack provided in this embodiment from another perspective;

[0010] Figure 3 This is a schematic diagram of the internal structure of the liquid cooling pipe in the battery pack provided in this embodiment;

[0011] Figure 4 This is a front view of the hollow triangular prism structure in this embodiment;

[0012] Figure 5 This is a schematic diagram of the structure in which the insulating support and the battery cooperate in this embodiment;

[0013] Figure 6 This is a top view of the battery pack provided in this embodiment;

[0014] Figure 7 This is a schematic diagram of the structure of the heat insulation part in this embodiment;

[0015] Figure 8 This is a schematic diagram of a modified example of the heat insulation part in this embodiment.

[0016] The annotations in the attached figures are explained as follows:

[0017] 100, Insulating support; 110, Heat insulation section; 1111, Curved side surface; 120, Opening; 200, Liquid cooling pipe; 200a, First liquid cooling pipe; 200b, Second liquid cooling pipe; 201, Separator; 2011, Arc-shaped surface; 202, Liquid cooling channel; 300, Cylindrical battery; 301, Circumferential surface; 400, Battery bracket; 401, Placement slot. Detailed Implementation

[0018] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of this disclosure.

[0019] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0020] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0021] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element(s) "upper," "lower," "inner," or "outer," it can be directly connected to the other element(s) "upper," "lower," "inner," or "outer," or indirectly connected to the other element(s) "upper," "lower," "inner," or "outer" through an intermediate element.

[0022] This embodiment provides a battery pack. See also... Figure 1 and Figure 2 As shown in the structure, the battery pack provided in this embodiment includes an insulating support 100, a liquid cooling pipe 200, and at least two batteries. The insulating support 100 includes a heat insulation portion 110, which is located between two adjacent batteries. At least a portion of the outer periphery of the battery is housed in the heat insulation portion 110, and at least a portion of the outer periphery of the battery exposed outside the heat insulation portion 110 is in contact with the liquid cooling pipe 200.

[0023] The battery pack provided in this embodiment improves the heat insulation between batteries by providing an insulating bracket 100, with the heat insulation portion 110 of the insulating bracket 100 located between two adjacent batteries and at least a portion of the outer periphery of the battery being accommodated in the heat insulation portion 110. At the same time, since at least a portion of the outer periphery of the battery exposed outside the heat insulation portion 110 is in contact with the liquid cooling pipe 200, the liquid cooling effect of the liquid cooling pipe 200 on the battery can be guaranteed.

[0024] It should be noted that the liquid cooling pipe 200 can be in direct contact with the outer periphery of the battery, or it can be indirectly in contact with the outer periphery of the battery. For example, the liquid cooling pipe 200 can be indirectly in contact with and fixed to the outer periphery of the battery by adhesive.

[0025] In one embodiment, the battery is a cylindrical battery 300. The outer periphery of the battery refers to the circumferential surface 301 of the cylindrical battery 300. Specifically, the circumferential surface 301 refers to the outer surface of the cylindrical battery 300 located between its top and bottom surfaces, wherein the top and bottom surfaces of the cylindrical battery 300 are two surfaces perpendicular to the axis of the cylindrical battery 300 and arranged opposite to each other. The circumferential surfaces 301 of two adjacent cylindrical batteries 300 and the portion of the liquid cooling pipe 200 facing between the two adjacent cylindrical batteries 300 form a cavity. Depending on the arrangement of the batteries, a cavity can be formed between the circumferential surfaces 301 of three cylindrical batteries 300 whose three centers form a triangle, and a cavity can also be formed between the circumferential surfaces 301 of four cylindrical batteries 300 whose four centers form a rectangle. The heat insulation part 110 is disposed in the cavity. The outer surface of the heat insulation part 110 can be in direct contact with the cylindrical battery 300 or indirect contact with the cylindrical battery 300. For example, the heat insulation part 110 is indirectly in contact with and fixed to the cylindrical battery 300 by adhesive.

[0026] In one embodiment, the heat insulation portion 110 includes a hollow columnar structure having a receiving portion, in which at least a portion of the outer periphery of the battery is received.

[0027] See Figure 5 As shown, the hollow columnar structure is located between two adjacent batteries. This method can further enhance the heat insulation effect between adjacent batteries and avoid thermal runaway.

[0028] The battery is a cylindrical battery 300, and the hollow cylindrical structure is a hollow prismatic structure. The receiving part is the curved side surface 1111 of the hollow prismatic structure, which is in contact with the circumferential surface 301 of the cylindrical battery 300. At least a portion of the circumferential surface 301 of the cylindrical battery 300 that is not in contact with the curved side surface 1111 can contact the liquid cooling pipe 200.

[0029] Since the circumferential surface 301 of the cylindrical battery 300 is an arc-shaped curved surface, in order to fit the circumferential surface 301 of the cylindrical battery 300, the hollow columnar structure is a hollow prismatic structure. The hollow prismatic structure has multiple curved sides 1111. For example, depending on the arrangement of the cylindrical batteries 300, the outline shape of the area enclosed by multiple adjacent cylindrical batteries 300 is also different. For example, the outline shape of the area can be a curved triangle, and correspondingly, the hollow prismatic structure is a hollow triangular prismatic structure.

[0030] For example, the outline shape of this area can also be a curved quadrilateral, and correspondingly, the hollow prism structure is a hollow quadrangular prism structure.

[0031] It should be noted that the hollow columnar structure is not limited to the hollow prismatic structure. Other forms of hollow columnar structures can be selected according to the gap profile between the batteries, as long as the heat insulation function between the batteries can be achieved.

[0032] In one embodiment, see Figure 4 As shown, the hollow prism structure is a hollow triangular prism structure with three curved sides 1111, wherein at least two curved sides 1111 are respectively attached to the circumferential surfaces 301 of two adjacent cylindrical batteries 300.

[0033] Specifically, all three curved surfaces 1111 are arc-shaped surfaces. For example, see [link to example]. Figure 5 As shown, the heat insulation part 110 includes five hollow triangular prism-shaped junctions. The five hollow triangular prism-shaped structures are connected in sequence to form an open annular structure. The opening of the open annular structure is the opening 120 of the insulating support 100. In two adjacent cylindrical batteries 300, the open annular structure is fitted onto the outside of one of the cylindrical batteries 300. That is, one cylindrical battery 300 is located inside the open annular structure, and the other cylindrical battery 300 is located outside the open annular structure. At least a portion of the hollow triangular prism-shaped structures in the open annular structure are located between the two adjacent cylindrical batteries 300.

[0034] In one embodiment, the number of heat insulation portions 110 is at least two, and at least two heat insulation portions 110 are in contact with the same battery.

[0035] See Figure 5 As shown, at least two heat insulation portions 110 are symmetrically arranged. The two heat insulation portions 110 are located between two adjacent batteries, and the curved sides 1111 of the two heat insulation portions 110 are joined to form an arc-shaped recess, and at least a portion of the circumferential surface 301 of the cylindrical battery 300 is accommodated in the arc-shaped recess.

[0036] In one embodiment, the insulating support 100 has an opening 120.

[0037] See Figure 8 As shown, the outermost insulating support 100 of the battery holder has at least one opening 120 that is opposite to at least a portion of the circumferential surface 301 of the cylindrical battery 300. The opening 120 faces the liquid cooling pipe 200. That is, the circumferential surface 301 opposite to the opening 120 is exposed to the outside of the housing and is in contact with the liquid cooling pipe 200 to achieve liquid cooling.

[0038] In one embodiment, the number of openings 120 is at least two; the insulating support 100 has a first side and a second side disposed opposite to each other, wherein one opening 120 is disposed on the first side and the other opening 120 is disposed on the second side.

[0039] For example, the receiving portion is located between two adjacent batteries, and the two openings 120 are located close to the two furthest surfaces between the two adjacent batteries, which can both achieve heat insulation between the two adjacent batteries and meet the requirements of liquid cooling pipes 200 located on opposite sides of the batteries to liquid cool the batteries.

[0040] In some embodiments, the battery is a cylindrical battery 300, and the number of liquid cooling pipes 200 is at least two, with two adjacent cylindrical batteries 300 located between two adjacent liquid cooling pipes 200; the insulating support 100 has at least two openings 120, one opening 120 facing one of the liquid cooling pipes 200 and the other opening 120 facing the other liquid cooling pipe 200; the longest distance between the end faces of the two openings 120 is the sum of the diameters of the two adjacent batteries.

[0041] See Figure 7 As shown, when two rows of batteries are arranged between two adjacent liquid cooling pipes 200, the first side of the insulating bracket 100 is close to one of the liquid cooling pipes 200, and the second side of the insulating bracket 100 is close to the other liquid cooling pipe 200. This arrangement allows both rows of batteries to contact the liquid cooling pipe 200 that is close to them, reducing the number of liquid cooling pipes and lowering the cost.

[0042] Specifically, Figure 7 The dashed line in the figure represents the end face of opening 120. The end face of opening 120 is a circular arc surface. The longest distance between the end faces of two openings 120 refers to the longest distance between the two circular arc surfaces.

[0043] For example, see Figure 6 As shown, two rows of placement slots 401 are provided between two adjacent liquid cooling pipes 200, and the two rows of placement slots 401 are staggered. The batteries in the two rows of placement slots 401 are also staggered. Specifically, the two adjacent liquid cooling pipes 200 are named the first liquid cooling pipe 200a and the second liquid cooling pipe 200b, respectively. In the two rows of batteries, the row closer to the first liquid cooling pipe 200a is named the first row of batteries, and the row closer to the second liquid cooling pipe 200b is named the second row of batteries. Among the five hollow triangular prism structures, one hollow triangular prism structure is located in the area enclosed between two adjacent cylindrical batteries 300 in the first row of batteries and the first liquid cooling pipe 200a. One curved side 1111 of the hollow triangular prism structure is in contact with the outer wall of the first liquid cooling pipe 200a, and the other two curved sides 1111 of the hollow triangular prism structure are in contact with the circumferential surfaces 301 of the two adjacent cylindrical batteries 300, respectively.

[0044] In the second row of batteries, the cylindrical battery 300 corresponding to the position between two adjacent cylindrical batteries 300 has a hollow triangular prism structure in the area enclosed by the two adjacent cylindrical batteries 300. The three curved sides 1111 of the hollow triangular prism structure are respectively attached to the circumferential surface 301 of the three cylindrical batteries 300. The hollow triangular prism structure is integrally formed with the hollow triangular prism structure in the area enclosed between the two adjacent cylindrical batteries 300 and the first liquid cooling pipe 200a in the first row of batteries.

[0045] For example, see Figure 7 As shown, there are eight hollow triangular prism structures, divided into four groups. Each group includes two hollow triangular prism structures, with one edge of one hollow triangular prism structure facing and fixedly connected to one edge of the other hollow triangular prism structure, meaning the two hollow triangular prism structures share a common edge. The four groups of hollow triangular prism structures are staggered to form two open annular structures. One open annular structure is fitted onto the outside of a cylindrical battery 300 near the first liquid cooling pipe 200a, and the other open annular structure is fitted onto the outside of another cylindrical battery 300 near the second liquid cooling pipe 200b, with the other cylindrical battery 300 adjacent to the first cylindrical battery 300. The opening of the open annular structure is the opening 120 of the insulating support 100, ensuring that the circumferential surface 301 of the cylindrical battery 300 located at the opening 120 can contact the liquid cooling pipe 200. Specifically, one of the annular structures has an opening facing the first liquid cooling pipe 200a, allowing the circumferential surface 301 of the cylindrical battery 300 to adhere to the first liquid cooling pipe 200a. The other annular structure has an opening facing the second liquid cooling pipe 200b, allowing the circumferential surface 301 of the cylindrical battery 300 to adhere to the second liquid cooling pipe 200b. This arrangement facilitates the application of adhesive between the cylindrical battery 300 and the liquid cooling pipe 200, improving the fixation effect between the cylindrical battery 300 and the liquid cooling device, reducing the amount of thermally conductive structural adhesive used, and achieving thermal insulation between the batteries to prevent thermal runaway.

[0046] For example, see Figure 8As shown, there are eight hollow triangular prism structures, divided into five groups. Three groups each include two hollow triangular prism structures, with one edge of one hollow triangular prism structure facing and fixedly connected to one edge of the other hollow triangular prism structure, meaning the two hollow triangular prism structures share a common edge. These three groups of hollow triangular prism structures are spaced apart along the same row of cells. The other two groups each include one hollow triangular prism structure, connected between adjacent groups of the three groups to form two parallel open annular structures. These two parallel open annular structures are fitted onto the exterior of two adjacent cylindrical cells 300 near the same liquid cooling pipe 200. The openings of the two annular structures face the same liquid cooling pipe 200, allowing the circumferential surfaces 301 of the two cylindrical cells 300 to fit against the same liquid cooling pipe 200.

[0047] In some embodiments, multiple hollow triangular prism structures are integrally formed.

[0048] It should be noted that the number of heat insulation parts 110 can also be one.

[0049] It should be noted that the two rows of placement slots 401 between two adjacent liquid cooling pipes 200 can also be arranged in rows and columns. That is, in the two rows of batteries, multiple cylindrical batteries 300 in one row correspond one-to-one with cylindrical batteries 300 in the other row. Therefore, the area enclosed between two adjacent cylindrical batteries 300 in one row and two corresponding cylindrical batteries 300 in the other row is a curved quadrilateral area. Correspondingly, the heat insulation part 110 located in the curved quadrilateral area can also be a hollow quadrangular prism structure.

[0050] It should also be noted that the specific structure and arrangement of the multiple heat insulation parts 110 are not limited to the above types. Other forms of heat insulation parts 110 and their arrangements can be selected according to actual production and processing needs.

[0051] In one embodiment, at least one hollow prismatic structure contains a phase change material inside.

[0052] When the battery generates a lot of heat, the phase change material can absorb the heat, thereby dissipating heat from the battery; when the overall temperature of the battery pack is low, the phase change material can release heat, thereby heating the battery and improving energy utilization efficiency.

[0053] In one embodiment, the liquid cooling pipe 200 is bonded and fixed to the battery, the battery is bonded and fixed to the heat insulation part 110, and the heat insulation part 110 is bonded and fixed to the liquid cooling pipe 200.

[0054] When the battery, insulating bracket 100 and liquid cooling pipe 200 are glued and fixed by potting, since the heat insulation part 110 is located between two adjacent batteries, it can effectively suppress a large amount of glue from flowing into the cavity between the two adjacent batteries. This ensures that the glue can fill the gap between the liquid cooling pipe 200, the battery and the heat insulation part 110, reducing the amount of glue used and thus reducing the overall weight, thereby effectively improving the energy density of the battery pack.

[0055] For example, the adhesive is an existing thermally conductive structural adhesive.

[0056] In one embodiment, the battery pack further includes a battery holder 400, on which both the battery and the insulating support 100 are located. The battery holder 400 is made of an insulating material to ensure the safety of the battery pack.

[0057] For example, the battery holder 400 is made of plastic.

[0058] In one embodiment, the battery holder 400 is provided with a placement slot 401, and the battery is fixedly installed in the placement slot 401.

[0059] For example, the cross-sectional shape of the placement slot 401 is circular to fit the circumferential surface 301 of the cylindrical battery 300. The upper surface of the battery holder 400 is provided with multiple rows of placement slots 401, which are arranged in parallel and spaced apart. Each row of placement slots 401 includes multiple placement slots 401. For example, adjacent rows of placement slots 401 are staggered. This arrangement can make full use of the battery holder 400 and place more batteries on it.

[0060] In one embodiment, the liquid cooling tube 200 is a serpentine flat tube. The serpentine flat tube is capable of liquid cooling the cylindrical battery 300. For example, the serpentine flat tube is disposed between two adjacent rows of placement slots 401 so that the serpentine flat tube can simultaneously liquid cool the cylindrical batteries 300 located on both sides thereon.

[0061] For example, there are multiple serpentine flat tubes arranged in parallel and spaced apart. There can be one or two rows of placement slots 401 between two adjacent serpentine flat tubes. This arrangement also ensures that each serpentine flat tube can simultaneously liquid cool the cylindrical batteries 300 located on both sides of it.

[0062] In one embodiment, the battery is a cylindrical battery 300, and the contact area between the liquid cooling pipe 200 and the circumferential surface 301 of the cylindrical battery 300 is greater than 1 / 4 and less than 1 / 2 of the circumferential surface area of ​​the cylindrical battery 300.

[0063] Specifically, if the contact area between the serpentine flat tube and the circumferential surface 301 of the cylindrical battery 300 is too large, the circumferential surface 301 of the cylindrical battery 300 used to contact the heat insulation part 110 will be too small, resulting in a reduction in the connection strength between the heat insulation part 110 and the cylindrical battery 300; if the contact area between the serpentine flat tube and the circumferential surface 301 of the cylindrical battery 300 is too small, the liquid cooling effect of the serpentine flat tube on the cylindrical battery 300 will be poor.

[0064] Therefore, in this embodiment, the contact area between the serpentine flat tube and the circumferential surface 301 of the cylindrical battery 300 is greater than 1 / 4 of the circumferential surface area of ​​the cylindrical battery 300 and less than 1 / 2 of the circumferential surface area of ​​the cylindrical battery 300.

[0065] For example, the contact area between the serpentine flat tube and the circumferential surface 301 of the cylindrical battery 300 can be 1 / 3 of the circumferential surface area of ​​the cylindrical battery 300.

[0066] For example, the contact area between the serpentine flat tube and the circumferential surface 301 of the cylindrical battery 300 can be 2 / 5 of the circumferential surface area of ​​the cylindrical battery 300.

[0067] It should be noted that the serpentine flat tube and the cylindrical battery 300 can be in direct contact or indirect contact. For example, the serpentine flat tube and the cylindrical battery 300 can be indirectly contacted and fixed by thermally conductive structural adhesive.

[0068] In some embodiments, a baffle 201 is provided inside the liquid cooling pipe 200, the extension direction of the baffle 201 being substantially the same as the extension direction of the liquid cooling plate, and the baffle 201 dividing the inner cavity of the liquid cooling pipe 200 into a plurality of liquid cooling channels 202. For example, see [link to example]. Figure 2 As shown, there are nine partitions 201, which divide the inner cavity of the liquid cooling pipe 200 into ten liquid cooling channels 202. The ten liquid cooling channels 202 are spaced apart along the height direction of the insulating support 100. This method can ensure a larger contact area between the liquid cooling medium and the battery, avoiding the problem that the liquid cooling medium can only cool the bottom of the battery under the action of gravity.

[0069] See Figure 2 As shown, the arrow Z indicates the height direction of the battery pack. When the liquid cooling pipe 200 liquid cools a row of batteries in the battery pack, multiple liquid cooling channels 202 can liquid cool different positions of the same battery, ensuring that each battery can receive relatively uniform liquid cooling.

[0070] In some embodiments, the flow direction of the liquid cooling medium in the plurality of liquid cooling channels 202 is the same.

[0071] In some embodiments, see Figure 3As shown, the two opposing surfaces of the partition 201 are both arc-shaped surfaces 2011, and the bending directions of the two arc-shaped surfaces 2011 are opposite. That is, each arc-shaped surface 2011 bends towards the other arc-shaped surface 2011. This makes the inner wall of the liquid cooling channel 202 smoothly transition, thereby reducing the flow resistance of the liquid cooling medium. At the same time, it can alleviate the impact of the liquid cooling medium on the liquid cooling pipe 200 and reduce the damage to the liquid cooling pipe 200.

[0072] In some embodiments, the liquid cooling pipe 200 is made of metal, and a thermally conductive buffer pad is provided on the outer surface of the liquid cooling pipe 200.

[0073] The metal liquid cooling pipe 200 can improve the liquid cooling effect. By setting a thermally conductive buffer pad on the outer surface of the liquid cooling pipe 200, it can buffer the battery while ensuring the liquid cooling effect and avoid damage to the battery.

[0074] It should be noted that the battery in this embodiment can also be a prismatic battery. The outer periphery of a prismatic battery refers to the surface perpendicular to the top plate of the battery pack housing.

[0075] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0076] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, The device includes an insulating support (100), a liquid cooling pipe (200), and at least two batteries. The insulating support (100) includes a heat insulation portion (110) located between two adjacent batteries. At least a portion of the outer periphery of each battery is housed in the heat insulation portion (110), and at least a portion of the outer periphery of each battery exposed outside the heat insulation portion (110) contacts the liquid cooling pipe (200). The number of liquid cooling pipes (200) is at least two, and the insulating support (100) has at least two openings (120), one of which faces one of the liquid cooling pipes (200) and the other of which faces the other liquid cooling pipe (200). The openings (120) extend through the insulating support (100) along the height direction of the battery pack. The insulating support (100) has a first side and a second side that are arranged opposite to each other. Two rows of batteries are arranged between two adjacent liquid cooling pipes (200). The first side of the insulating support (100) is close to one of the liquid cooling pipes (200), and the second side of the insulating support (100) is close to the other liquid cooling pipe (200). The heat insulation part (110) includes a hollow columnar structure with a receiving part, at least a portion of the outer periphery of the battery is received in the receiving part, the battery is a cylindrical battery (300), the hollow columnar structure is a hollow prismatic structure, the receiving part is a curved surface (1111) of the hollow prismatic structure, the hollow prismatic structure is a hollow triangular prismatic structure, the hollow triangular prismatic structure has three curved surfaces (1111), the three curved surfaces (1111) are respectively attached to the circumferential surface (301) of the three cylindrical batteries (300).

2. The battery pack according to claim 1, characterized in that, The number of heat insulation parts (110) is at least two, and at least two of the heat insulation parts (110) are in contact with the same battery.

3. The battery pack according to claim 2, characterized in that, At least two of the heat insulation parts (110) are symmetrically arranged.

4. The battery pack according to claim 1, characterized in that, One of the openings (120) is located on the first side, and the other opening (120) is located on the second side.

5. The battery pack according to claim 1, characterized in that, The liquid cooling pipe (200) is bonded and fixed to the battery, the battery is bonded and fixed to the heat insulation part (110), and the heat insulation part (110) is bonded and fixed to the liquid cooling pipe (200).

6. The battery pack according to claim 1, characterized in that, At least one of the hollow columnar structures contains a phase change material inside.

7. The battery pack according to claim 1, characterized in that, The contact area between the liquid cooling pipe (200) and the circumferential surface (301) of the cylindrical battery (300) is greater than 1 / 4 of the circumferential surface area of ​​the cylindrical battery (300) and less than 1 / 2 of the circumferential surface area of ​​the cylindrical battery (300).

8. The battery pack according to claim 1, characterized in that, Two adjacent cylindrical batteries (300) are located between two adjacent liquid cooling pipes (200); the longest distance between the end faces of the two openings (120) is the sum of the diameters of the two adjacent cylindrical batteries (300).

9. The battery pack according to any one of claims 1 to 8, characterized in that, It also includes a battery holder (400), on which both the battery and the insulating support (100) are located.

10. The battery pack according to claim 9, characterized in that, The battery holder (400) is provided with a placement slot (401), and the battery is fixedly installed in the placement slot (401).

11. The battery pack according to any one of claims 1 to 8, characterized in that, The liquid cooling pipe (200) is provided with a partition (201), which divides the inner cavity of the liquid cooling pipe (200) into multiple liquid cooling channels (202), and the multiple liquid cooling channels (202) are spaced apart along the height direction of the battery pack.

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