Liquid-cooled CTP power battery structure convenient to maintain

Abstract

The invention discloses a liquid-cooled CTP power battery structure convenient to maintain. The liquid-cooled CTP power battery structure comprises a box cover integrated upper liquid cooling chamber, a bottom plate of the box body is integrated with a lower liquid cooling chamber, a battery pack is arranged in the box body, and the box cover is detachably and hermetically connected with the box body to form a CTP power battery pack. The upper portion of the battery pack is cooled through the box cover, the lower portion of the battery pack is cooled through the box body, it can be guaranteed that the battery pack is in a proper temperature range for a long time, the cycle life of the battery pack is prolonged, and the charging and discharging performance of the battery pack is improved; and the heat conduction pad buffers the pressing force and has a heat conduction effect, so that the structure of the detachable battery pack is convenient for later maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of CTP power battery manufacturing, and in particular to a liquid-cooled CTP power battery structure which is convenient for maintenance. Background Art

[0002] With the rapid development of new energy vehicles, power batteries tend to be highly integrated. With the increasing use of CTP power batteries, in order to simplify the internal structure of the battery, the industry began to use a large amount of glue for fixation. As a result, disassembly and maintenance difficulties also emerged. As the sales scale increases, after-sales maintenance work becomes more difficult.

[0003] Patent document with application number 202210686178.0 discloses a new energy vehicle, a CTP power battery pack and a step-by-step disassembly method thereof. It can be understood from its scheme that the current CTP power battery pack is difficult to disassemble. When the CTP power battery pack fails, the existing CTP power battery pack structure is not conducive to disassembly and maintenance.

[0004] Patent document No. 202322110760.5 discloses a flipping device for disassembling retired CTP power battery packs. It can be seen from the solution that the existing CTP power battery packs are not conducive to disassembly, and there is also a problem that when the CTP power battery pack fails, it is not easy to repair. Summary of the invention

[0005] In view of the above problems, the object of the present invention is to provide a liquid-cooled CTP power battery structure that is easy to maintain, so that the CTP power battery is easy to maintain, has a long battery life, high overall structural strength and strong stability.

[0006] The purpose of the present invention can be achieved by the following technical solution: A liquid-cooled CTP power battery structure that is easy to maintain, comprising:

[0007] A box cover, wherein the box cover is integrated with an upper liquid cooling chamber;

[0008] A box body, wherein the bottom plate of the box body is integrated with a lower liquid cooling chamber, and the box body has a built-in battery pack;

[0009] The box cover is detachably sealed and connected to the box body to form a CTP power battery pack.

[0010] As a further solution of the present invention, the box cover is integrated with a liquid cooling chamber structure, wherein the interior of the box cover is a hollow closed cavity, the cavity is connected with a water inlet pipe and a water outlet pipe, cold partitions are distributed at intervals in the cavity, the cold partitions are welded to the inner cavity surface of the frame, and the cold partitions divide the cavity into interconnected circulation spaces.

[0011] As a further solution of the present invention, the bottom plate of the box body has an integrated lower liquid cooling chamber structure, wherein the interior of the bottom plate is a hollow closed cavity, the cavity is connected with a water inlet pipe and a water outlet pipe, cold partitions are distributed at intervals in the cavity, the cold partitions are welded to the inner cavity surface of the frame, and the cold partitions divide the cavity into interconnected circulation spaces.

[0012] As a further solution of the present invention, the bottom surface of the box bottom plate is connected with a bottom guard plate.

[0013] As a further solution of the present invention, the box body also includes a frame body, and the frame body and the bottom plate are welded together.

[0014] As a further solution of the present invention, a partition is provided in the box body, and the partition is connected to the inner wall of the frame body to divide the box body into a plurality of battery pack placement slots.

[0015] As a further solution of the present invention, a thermal pad is bonded to the top surface of the bottom plate, the battery pack is placed on the thermal pad, and a thermal conductive adhesive is applied to the top of the battery pack for bonding to the box cover.

[0016] As a further solution of the present invention, a sealing gasket is provided between the box cover and the frame, the back side of the sealing gasket is glued and fixed to the frame, and the box cover is connected to the frame by bolts.

[0017] As a further solution of the present invention, the sealing gasket is made of foamed silicone and is compressible.

[0018] As a further solution of the present invention, the battery pack is formed by bonding and stacking battery cells with double-sided adhesive.

[0019] Beneficial effects of the present invention:

[0020] 1. The liquid-cooled CTP power battery of the present invention has a liquid cooling chamber provided on the cover and the bottom plate, forming a complete cooling circulation system to continuously cool or heat the upper and lower parts of the battery pack, which can ensure that the battery pack is kept at a suitable temperature with balanced temperature for a long time, thereby improving the service life of the battery pack.

[0021] 2. The box body and the box cover of the present invention have sufficient structural strength, the battery pack is installed firmly, and the profile cavity structure has the advantages of high structural strength, good stability and good mechanical properties.

[0022] 3. The box cover of the present invention is arranged above the battery pack and connected to the box body by bolts. A sealing gasket is arranged between the box cover and the box body. The sealing gasket is made of foamed silicone material and is compressible. The box cover and the box body are connected by bolts to achieve the sealing of the battery pack. At the same time, this structure realizes the structure of the detachable battery pack for easy later maintenance.

[0023] 4. In the CTP power battery pack of the present invention, a thermal pad is bonded to the top surface of the bottom plate, the thermal pad is arranged between the battery pack and the box body, the battery pack is placed on the thermal pad, the thermal pad has heat conduction and installation buffering functions, this structure realizes a detachable battery pack structure for easy later maintenance; thermal conductive glue is applied on the top of the battery pack for bonding the box cover, and the thermal conductive glue is used to transfer heat to avoid uneven heat transfer due to the uneven surface of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the split structure of a liquid-cooled CTP power battery that is easy to maintain according to the present invention;

[0025] Figure 2 A schematic diagram of the battery pack of the present invention installed in a box;

[0026] Figure 3 It is a cross-sectional schematic diagram of the liquid cooling structure of the box cover of the present invention;

[0027] Figure 4 This is a cross-sectional view of the CTP power battery pack of the present invention;

[0028] Figure 5 This is a schematic diagram of an exploded view of a battery pack of the present invention;

[0029] Figure 6 It is an exploded schematic diagram of the box body of the present invention.

[0030] 110, box cover; 111, water inlet pipe; 112, water outlet pipe; 113, cold partition;

[0031] 120, box body; 121, bottom plate; 122, frame body; 123, partition;

[0032] 130. battery pack; 131. battery cell; 132. battery separator;

[0033] 140, bottom guard plate;

[0034] 150. Thermal pad;

[0035] 160. Sealing gasket. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] like Figure 1As shown in FIG. 4 , the present invention discloses a liquid-cooled CTP power battery structure that is easy to maintain, including a box cover 110 , a box body 120 , a battery pack 130 , and the like.

[0038] The box cover 110 is integrated with an upper liquid cooling chamber, and the bottom plate 121 of the box body 120 is integrated with a lower liquid cooling chamber. The upper liquid cooling chamber and the lower liquid cooling chamber form a cooling circulation system. The upper liquid cooling chamber continuously cools / heats the upper part of the battery pack 130, and the lower liquid cooling chamber continuously cools / heats the lower part of the battery pack 130, which can ensure that the battery pack 130 is kept at a suitable temperature with balanced temperature for a long time, thereby improving the service life of the battery pack 130. In the actual use of the liquid cooling system, the liquid cooling system is not only used to cool the battery module, but also to preheat the battery module to ensure the normal startup and use of the battery module under severe cold conditions.

[0039] The cavity structure formed between the box cover 110 and the bottom plate 121 serves as a liquid cooling chamber. The formed cavity can be formed by welding or other processes. The profile cavity structure has high strength, good stability, and good mechanical properties, so that the battery pack 130 can be installed firmly and not easily deformed.

[0040] The box cover 110 is integrated with an upper liquid cooling chamber structure, and the bottom plate 121 of the box body 120 is integrated with a lower liquid cooling chamber structure. Figure 3 As shown, the interior of the box cover 110 is a hollow closed cavity, the cavity is connected to a water inlet pipe 111 and a water outlet pipe 112, and cold partitions 113 are distributed at intervals in the cavity. The cold partitions 113 are welded to the inner surface of the cavity, and the cold partitions 113 divide the cavity into interconnected circulation spaces.

[0041] The interior of the bottom plate 121 is a hollow closed cavity, which is connected to a water inlet pipe 111 and a water outlet pipe 112. Cold partitions 113 are distributed at intervals in the cavity. The cold partitions 113 are welded to the inner surface of the cavity, and the cold partitions 113 divide the cavity into interconnected circulation spaces.

[0042] Specifically, the cold partition 113 divides the cavity into an inlet cavity, a convection cavity and a reflux cavity. The cold partitions 113 in the inlet cavity, the convection cavity and the reflux cavity are evenly spaced. One end of the cold partition 113 between the inlet cavity and the convection cavity and one end of the cold partition 113 between the reflux cavity and the convection cavity are connected to the inner wall of the cavity between the water inlet pipe 111 and the water outlet pipe 112. One end of the cold partition 113 in the middle of the convection cavity is connected to the inner wall of the cavity on the side away from the water inlet pipe 111 and the water outlet pipe 112.

[0043] Among them, the water inlet pipe 111 is connected to the inlet cavity, and the water outlet pipe 112 is connected to the reflux cavity. When the liquid circulates in the cavity, it passes through the inlet cavity, the convection cavity and the reflux cavity in sequence, realizing sufficient circulation of the liquid in the cavity and achieving uniform cooling or heating of the internal battery pack 130.

[0044] The structure of CTP power battery pack is as follows Figure 5 As shown, the CTP power battery pack includes multiple battery groups 130, each battery group 130 is composed of a battery separator 132 with double-sided adhesive and a battery cell 131 that is bonded and stacked together; the poles of each battery cell 131 are stacked and welded together to form an integral whole, and the battery groups 130 are interconnected to form a complete battery pack.

[0045] The structure of the box 120 is as follows: Figure 6 As shown, the bottom surface of the bottom plate 121 of the box body 120 is connected to the bottom guard plate 140, and the bottom guard plate 140 can be connected to the bottom plate 121 by bolts, which plays a protective role in the use of the CTP power battery pack and is convenient for replacement when damaged.

[0046] The box body 120 includes a bottom plate 121 and a frame body 122. The frame body 122 and the bottom plate 121 are welded together. The welding process can adopt a stir friction welding or FDS process, so that the box body 120 maintains a high strength and sealing performance.

[0047] like Figure 6 As shown, a partition 123 is also provided in the box body 120, and the partition 123 is connected to the inner wall of the frame body 122 to divide the box body 120 into multiple battery pack 130 placement slots. When in use, each battery pack 130 is independently placed in a placement slot, which is more conducive to the stability of the CTP power battery pack.

[0048] Furthermore, if Figure 1 As shown in or 6, a thermal pad 150 is bonded to the top surface of the bottom plate 121, and the thermal pad 150 is arranged between the battery pack 130 and the bottom plate 121. The battery pack 130 is placed on the thermal pad 150. The thermal pad 150 has heat conduction and installation buffering functions. A thermal conductive adhesive is applied on the top of the battery pack 130 to bond the box cover 110. The thermal conductive adhesive is used to transfer heat to avoid uneven heat transfer due to the uneven surface of the battery pack 130.

[0049] Furthermore, a sealing gasket 160 is provided between the box cover 110 and the frame body 122 . The back side of the sealing gasket 160 is glued and fixed to the frame body 122 . The box cover 110 is connected to the frame body 122 by bolts.

[0050] With the above structure, when assembling the CTP power battery pack, bolts are used to connect the box cover 110 and the box body 120 to compress the battery pack 130. The sealing gasket 160 is made of foamed silicone material and is compressible. The box cover 110 and the box body 120 are connected by bolts to achieve the sealing of the battery pack. The thermal pad 150 buffers the pressing force and also has a heat-conducting effect. This structure enables the battery pack 130 to be firmly installed in the box body 120, and also facilitates the detachable structure of the battery pack 130 for later maintenance.

[0051] The cooling cycle structure of the present invention can ensure that the battery pack 130 in the CTP power battery pack is at a suitable temperature for a long time, thereby increasing the service life of the battery pack 130 and improving the cruising range of the electric vehicle; when the battery pack fails, the connecting bolts between the box cover 110 and the box body 120 can be removed to take out the battery pack 130 for maintenance, thus avoiding the problem of difficult disassembly and maintenance, facilitating after-sales service, and reducing the marketing cost of batteries and new energy vehicles.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0053] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A liquid-cooled CTP power battery structure that is easy to maintain, characterized in that: include: A box cover (110), wherein the box cover (110) is integrated with an upper liquid cooling chamber; A box (120), wherein a bottom plate (121) of the box (120) is integrated with a lower liquid cooling chamber, and the box (120) has a built-in battery pack (130); The box cover (110) is detachably sealed and connected to the box body (120) to form a CTP power battery pack.

2. According to claim 1, a liquid-cooled CTP power battery structure that is easy to maintain, characterized in that: The box cover (110) has an integrated upper liquid cooling chamber structure, wherein the interior of the box cover (110) is a hollow closed cavity, the cavity is connected to a water inlet pipe (111) and a water outlet pipe (112), cold partitions (113) are distributed at intervals in the cavity, the cold partitions (113) are welded to the inner surface of the cavity, and the cold partitions (113) divide the cavity into circulating spaces that are interconnected.

3. The liquid-cooled CTP power battery structure with easy maintenance according to claim 1, characterized in that: The bottom plate (121) of the box body (120) has an integrated lower liquid cooling chamber structure, wherein the interior of the bottom plate (121) is a hollow closed cavity, the cavity is connected to a water inlet pipe (111) and a water outlet pipe (112), cold partitions (113) are distributed at intervals in the cavity, the cold partitions (113) are welded to the inner surface of the cavity, and the cold partitions (113) divide the cavity into circulating spaces that are interconnected.

4. The liquid-cooled CTP power battery structure with easy maintenance according to claim 1, characterized in that: The bottom surface of the bottom plate (121) of the box body (120) is connected to a bottom protective plate (140).

5. The liquid-cooled CTP power battery structure with easy maintenance according to claim 1, characterized in that: The box body (120) further comprises a frame body (122), and the frame body (122) and the bottom plate (121) are formed by welding.

6. The liquid-cooled CTP power battery structure with easy maintenance according to claim 5, characterized in that: A partition (123) is provided in the box (120), and the partition (123) is connected to the inner wall of the frame (122) to divide the box (120) into a plurality of slots for placing battery packs (130).

7. The liquid-cooled CTP power battery structure with easy maintenance according to claim 1, characterized in that: A thermal pad (150) is bonded to the top surface of the bottom plate (121), the battery pack (130) is placed on the thermal pad (150), and thermal conductive glue is applied to the top of the battery pack (130) for bonding to the box cover (110).

8. The liquid-cooled CTP power battery structure with easy maintenance according to claim 5, characterized in that: A sealing gasket (160) is provided between the box cover (110) and the frame (122); the back side of the sealing gasket (160) is glued and fixed to the frame (122); and the box cover (110) is connected to the frame (122) via bolts.

9. The liquid-cooled CTP power battery structure with easy maintenance according to claim 8, characterized in that: The sealing pad (160) is made of foamed silica gel and is compressible.

10. The liquid-cooled CTP power battery structure with easy maintenance according to claim 1, characterized in that: The battery pack (130) is formed by bonding and stacking a battery separator (132) with double-sided adhesive and a battery cell (131).

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