Battery pack and electric device

Abstract

A battery pack, comprising: a CCS assembly (1); a battery case (2), wherein the CCS assembly (1) is mounted and fixed in the battery case (2); and a sealant component (3), wherein the sealant component (3) is arranged between the battery case (2) and the CCS assembly (1), and the sealant component (3) extends in the peripheral direction of the CCS assembly (1) to seal an assembly gap between the CCS assembly (1) and the battery case (2).

Description

Battery pack and power-consuming device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 27, 2024, with application number 202420615533X. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of batteries, and in particular to a battery pack and an electrical device. Background Art

[0003] At present, the sealing design of relevant battery packs mainly sets a sealing groove on the lower box body of the battery box and configures a sealing rib on the upper box cover of the battery box. When the upper box cover is closed with the lower box body, the sealing rib and the sealing groove cooperate to form a seal to ensure the sealing of the battery pack. Technical issues

[0004] The sealing ribs in the sealing structure need to occupy a certain space, that is, this sealing structure will need to occupy the internal space of the battery box, which cannot meet the requirements of the recent battery design for a compact battery pack structure. Technical Solutions

[0005] In a first aspect, the present application provides a battery pack, comprising:

[0006] CCS components;

[0007] A battery box, wherein the CCS assembly is installed and fixed in the battery box;

[0008] A sealant component is provided between the battery case and the CCS assembly, and the sealant component extends along the circumferential side of the CCS assembly to seal the assembly gap between the CCS assembly and the battery case.

[0009] In a second aspect, the present application provides an electrical device including the above-mentioned battery pack. Beneficial effects

[0010] The battery pack of the present application cleverly arranges the sealant component between the battery case and the CCS assembly, effectively utilizing the space in the assembly gap between the battery case and the CCS assembly, improving the space utilization of the battery case, and eliminating the space for additionally configuring and installing sealing ribs on the battery case, thereby solving the problem of the sealing structure in the relevant battery pack occupying a lot of space. It not only achieves the effect of compact assembly and space saving, but also is conducive to the highly integrated design of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG1 is an exploded structural diagram of a battery pack of the present application;

[0012] FIG2 is a partial enlarged schematic diagram of point A in FIG1 ;

[0013] FIG3 is an assembly structure diagram of a battery pack of the present application;

[0014] FIG4 is a schematic top view of a battery pack of the present application;

[0015] FIG5 is a schematic cross-sectional view taken along line BB in FIG4 ;

[0016] FIG6 is a partial enlarged schematic diagram of point C in FIG5 .

[0017] Icons: 1-CCS assembly, 11-plastic bracket, 12-sealing groove structure, 121-first groove wall, 122-second groove wall, 13-conductive connecting bar, 14-insulating spacer, 15-connecting port, 16-movable buckle structure, 17-busbar limiting groove, 18-BMS component, 2-battery box, 21-lower box, 22-upper box cover, 23-limiting protrusion, 24-battery box cavity, 3-sealing glue component, 4-battery pack, 41-battery cell, 42-bus, 5-foam buffer, 6-potting colloid, 61-first potting part, 62-second potting part, 63-third potting part. Modes for Carrying Out the Invention

[0018] Specifically, please refer to Figures 1 to 5. The present application discloses a battery pack, including a CCS component 1, a battery case 2, a battery pack 4 and a sealant component 3. The CCS component 1 and the battery pack 4 are both installed and fixed inside the battery case 2, wherein the battery case 2 has a lower case 21 and an upper case cover 22 detachably connected to the lower case 21. In some embodiments, the detachable connection here is a threaded connection, and can also be a snap connection, and can also be a combination of the above two connection methods, so that the upper case cover 22 can be firmly covered on the lower case 21, thereby well protecting the CCS component 1 and the battery pack 4 from external touch and impact.

[0019] As shown in Figures 1 and 4, the outer side walls of the lower case 21 and / or the upper case cover 22 of the battery case 2 are provided with reinforcing ribs. The structure of the reinforcing ribs can greatly improve the structural strength of the battery case 2, so that the battery case 2 can withstand greater stress when subjected to external loads, thereby preventing the battery case 2 from deformation, breakage or other forms of failure.

[0020] In this embodiment, as shown in Figures 1 and 2 , a battery pack 4 is electrically connected to the CCS assembly 1 . The battery pack 4 includes several cells 41 , which are connected in series and parallel via a bus 42 , ensuring that the battery pack has a large capacity and improving the battery pack's endurance.

[0021] It should be noted that in some embodiments, the battery cell 41 is a prismatic battery. The side with the largest area of ​​the battery cell 41 is defined as the battery's major surface. Each battery cell 41 has two major surfaces, and the two major surfaces are arranged opposite each other. The side of the battery cell 41 on which the electrodes (positive and negative) are disposed is further defined as the electrode top surface of the battery cell 41. The side of the battery cell 41 opposite the electrode top surface is defined as the battery's bottom surface. The major surfaces of two adjacent battery cells 41 are arranged relative to each other, and the electrodes of each battery cell 41 are located on the same side of the battery pack 4. If the electrode top surfaces of the individual battery cells 41 are spliced ​​together to form the electrode external surface of the battery pack 4, then the electrode external surface is the side of the battery pack 4 on which the electrodes are disposed.

[0022] As the core solution of this embodiment, please refer to Figures 1 to 5 for details. The above-mentioned sealant component 3 is arranged between the battery box 2 and the CCS assembly 1, and the sealant component 3 extends along the circumferential direction of the CCS assembly 1 to seal the assembly gap between the CCS assembly 1 and the battery box 2.

[0023] During assembly, the lower case 21 and upper case cover 22 of the battery case 2 are disassembled. The battery pack 4 is first placed in the battery case cavity 24 of the lower case 21. The CCS assembly 1 is then installed onto the battery pack 4. At this point, an assembly gap will exist between the inner sidewall of the lower case 21 and the sidewall of the CCS assembly 1. Next, the sealant member 3 is assembled onto the CCS assembly 1, sealing the assembly gap between the CCS assembly 1 and the battery case 2. This forms a relatively sealed lower chamber between the CCS assembly 1, the sealant member 3, and the lower case 21, allowing the battery pack 4 to reside within this relatively sealed lower chamber. Finally, as shown in Figure 3, when the upper box cover 22 is closed onto the lower box body 21, the upper box cover 22 presses the top of the sealant component 3, so that the sealant component 3 will be able to seal the assembly gap between the lower box body 21 and the upper box cover 22. At the same time, the CCS component 1, the sealant component 3 and the upper box cover 22 will form a relatively sealed upper chamber, and the CCS component 1 will be in the relatively sealed battery box cavity 24.

[0024] It should be noted that the assembly method of the battery pack is only used as a reference to facilitate understanding of the core solution of this application and is not limited to this assembly method.

[0025] It should also be noted that in order to facilitate the installation and positioning of the battery pack 4 in the battery box cavity 24, a convex rib structure can be formed on the bottom and surrounding sides of the battery box cavity 24, and the convex rib structure can be used to constrain the battery pack 4, thereby achieving the purpose of installation and positioning of the battery pack 4.

[0026] In some embodiments, as shown in Figures 1, 2, 4, and 5, the plastic support 11 of the CCS assembly 1 is provided with a sealing groove structure 12, which extends along the circumference of the plastic support 11. Specifically, the sealing groove structure 12 has a first groove wall 121 extending along the height direction of the battery cell 41, and a second groove wall 122 perpendicular to the first groove wall 121. The direction perpendicular to the bottom surface of the battery is the height direction of the battery cell 41.

[0027] In this way, when the plastic bracket 11 of the CCS component 1 is installed and fixed in the lower chamber of the lower box body 21, the inner side wall of the lower box body 21, the lower bottom surface of the upper box cover 22, and the first groove wall 121 and the second groove wall 122 of the sealing groove structure 12 will be formed into a sealed space, and the sealant component 3 is embedded in the sealed space, thereby effectively sealing the assembly gap between the lower box body 21 and the upper box cover 22, and the assembly gap between the CCS component 1 and the battery box body 2, and the structure is simple and the integration is higher.

[0028] In some embodiments, specifically as shown in Figure 6, the above-mentioned sealant component 3 is provided with a limiting groove, and the upper box cover 22 is provided with a limiting protrusion 23 inserted into the limiting groove. The limiting groove extends along the circumferential side direction of the CCS component 1. When the upper box cover 22 is closed to the lower box body 21, the limiting protrusion 23 is embedded in the limiting groove, ensuring that the assembly between the sealant component 3 and the battery box body 2 is more compact, and further improving the sealing of the battery pack.

[0029] It should be noted that to improve assembly efficiency, the aforementioned plastic bracket 11 may be provided with busbar retaining slots 17. The number of busbar retaining slots 17 is the same as the number of busbars 42, and each busbar retaining slot 17 is provided corresponding to each busbar 42. The bottom of each busbar retaining slot 17 is provided with a connection port. When a busbar 42 is assembled into a corresponding busbar retaining slot 17, it can be electrically connected to the electrodes of the battery pack 4 at the bottom of the plastic bracket 11. This arrangement, under the restraining effect of the busbar retaining slots 17, allows the busbar 42 to be quickly positioned during assembly, and avoids the risk of accidental contact of the busbar 42 during subsequent assembly or use.

[0030] In some embodiments, a positioning groove structure is provided on the inner side wall of the lower box body 21 , and the positioning groove structure, the upper box cover 22 and the side wall of the plastic bracket 11 are formed into the above-mentioned sealed space, and the sealant component 3 is embedded in the sealed space.

[0031] Alternatively, in addition to the two methods of embedding and fixing the sealant member 3, the inventors have also proposed another fixing method in which the sealant member 3 is directly sandwiched between the inner sidewall of the lower case 21 and the sidewall of the plastic bracket 11, utilizing the friction between the sealant member 3 and the inner sidewall of the lower case 21, as well as the friction between the sealant member 3 and the sidewall of the plastic bracket 11. In this way, the sealant member 3 creates an interference fit between the upper case cover 22 and the plastic bracket 11.

[0032] In some embodiments, specifically referring to Figures 1 and 3 , the battery pack includes a foam buffer 5, which is disposed between the battery case 2 and the battery pack 4. In some embodiments, the large surface of the battery cell 41 in the battery pack 4 close to the side wall of the battery case 2 abuts against one side surface of the foam buffer 5, and the other side surface of the foam buffer 5 abuts against the inner wall of the lower case 21 of the battery case 2.

[0033] As such, the foam cushioning member 5 exhibits excellent elasticity, insulation, light weight, and thinness. This not only ensures good insulation between the battery cells 41 near the sidewalls of the battery case 2 and the battery case 2, thereby enhancing the safety and stability of the battery pack, but also effectively absorbs the total amount of expansion deformation generated by the battery cells 41 during charge and discharge along a first direction perpendicular to the large surface of the battery cells 41, thereby preventing the risk of compression damage between the battery cells 41 and the sidewalls of the battery case 2 during charge and discharge.

[0034] In some embodiments, specifically referring to FIG6 , the battery pack further includes a potting colloid 6, that is, after the battery pack 4 is placed in the lower case 21, a thermosetting polymer insulating material is filled into the battery case 2 using a potting process. In some embodiments, the potting colloid 6 includes a first potting portion 61, which is disposed between the CCS assembly 1 and the battery case 2. In some embodiments, the thermosetting polymer insulating material is filled between the plastic bracket 11 of the CCS assembly 1 and the lower case 21 of the battery case 2. After curing, the plastic bracket 11 is bonded and fixed to form the first potting portion 61. The first potting portion 61 extends along the circumferential direction of the plastic bracket 11 of the CCS assembly 1. In this way, the assembly stability of the CCS assembly 1 is ensured, and at the same time, the sealing between the CCS assembly 1 and the battery case 2 is further ensured.

[0035] An unexpected effect is that the cooperation of the first potting portion 61 , the sealant component 3 and the plastic bracket 11 of the CCS assembly 1 achieves a double sealing effect, ensuring good sealing of the battery pack.

[0036] It should be noted that the top surface of the first potting portion 61 is flush with the external electrode surface of the battery pack 4, which ensures that the overall assembly of the battery pack is more compact, further saves assembly space, and at the same time ensures that the force on the CCS component 1 is more uniform after assembly.

[0037] In some embodiments, specifically referring to Figures 3 and 5, the potting colloid 6 also includes a second potting portion 62 integrally formed with the first potting portion 61, and the second potting portion 62 is arranged between the battery case 2 and the battery pack 4. In some embodiments, that is, the thermosetting polymer insulating material is filled between the lower case 21 of the battery case 2 and the battery cell 41 of the battery pack 4, and the second potting portion 62 extends toward one side of the foam buffer 5. The second potting portion 62 can optionally extend to the top of the foam buffer 5, as shown in Figure 3. It can also be selected that a portion of the second potting portion 62 extends to the top of the foam buffer 5, and the other portion extends along the depth direction of the battery case cavity 24 to the bottom of the battery case cavity 24.

[0038] Thus, under the action of the second potting portion 62, the thermosetting polymer insulating material, after curing, bonds and secures the battery pack 4 / battery cells 41, and also bonds and secures the foam cushioning member 5, thereby further securing the battery pack 4 and the foam cushioning member 5. Furthermore, the cooperation between the second potting portion 62 and the foam cushioning member 5 further ensures the insulation between the battery pack 4 and the battery case 2, improving the safety of the battery pack.

[0039] In addition, as shown in FIG3 , the potting colloid 6 further includes a third potting portion 63, which is disposed between the battery case 2 and the battery pack 4. In some embodiments, the thermosetting polymer insulating material is filled between the lower case 21 of the battery case 2 and the battery cells 41 of the battery pack 4, and the thermosetting polymer insulating material extends along the depth direction of the battery case cavity 24 to the bottom of the battery case cavity 24. After the thermosetting polymer insulating material is cured, it adheres to the battery cells 41 and is formed into the third potting portion 63. At this time, the third potting portion 63 and the foam buffer 5 are respectively located on the adjacent two side surfaces of the battery pack 4. The third potting portion 63 cooperates with the second potting portion 62 to pot the peripheral side of the battery pack 4, so that the peripheral side of the battery pack 4 is well insulated from the lower case 21 and is stably bonded and fixed.

[0040] It should be noted that, specifically with reference to Figures 1, 2, 3, and 5, the CCS assembly 1 further includes a BMS component 18. This BMS component 18 represents a relatively mature technology in the battery field and is capable of intelligently managing and maintaining the cells 41 of the battery pack 4, monitoring the status of the cells 41 to prevent the risk of overcharging and overdischarging, thereby extending the service life of the cells 41. The BMS component 18 includes a management module, a control module, a display module, a wireless communication module, and a collection module for collecting information from the cells 41 of the battery pack 4.

[0041] In this embodiment, the BMS component 18 is disposed on top of the plastic bracket 11. The BMS component 18 can be fixedly connected to the upper cover 22 of the battery case 2, or alternatively, to the plastic bracket 11. Furthermore, the BMS component 18 is electrically connected to the battery pack 4 via the conductive connecting bar 13.

[0042] To ensure electrical insulation between the BMS element 18 and the battery pack 4, in some embodiments, specifically with reference to Figures 1, 2, 3 and 5, an insulating spacer 14 is further configured between the BMS element 18 and the battery pack 4, wherein a connecting port 15 is configured on the insulating spacer 14. The connecting port 15 here may be a notch structure or a through hole. The conductive connecting bar 13 passes through the connecting port 15 and is connected to the BMS element 18, that is, one end of the conductive connecting bar 13 is connected and fixed to the battery pack 4, and the other end of the conductive connecting bar 13 passes through the connecting port 15 of the insulating spacer 14 and is connected to the BMS element 18. The insulating spacer 14 is fixedly connected to the plastic bracket 11.

[0043] In some embodiments, specifically referring to Figures 2 and 3, at least one movable buckle structure 16 is arranged on the plastic bracket 11, and the movable buckle structure 16 has a first buckle portion and a second buckle portion arranged relatively to each other, and the first buckle portion and the second buckle portion can be deformed when subjected to force. Specifically, a deformation space is arranged between the first buckle portion and the second buckle portion, so that the first buckle portion and the second buckle portion can bend toward the deformation space when subjected to force until the first buckle portion and the second buckle portion can be inserted into and pass through the assembly hole of the insulating isolation member 14. At the same time, the first buckle portion and the second buckle portion can both be deformed and restored to clamp the insulating isolation member 14 when the external force is removed.

[0044] In this way, the use of the movable buckle structure 16 can achieve the purpose of quick assembly of the insulating isolation member 14, and the structure is simple. At the same time, it avoids the risk of loosening of bolts or screws during long-term use, thereby ensuring the stability of the insulating isolation member 14 during long-term use.

[0045] Furthermore, based on the structure and connection relationship of the aforementioned battery pack, the inventors have also disclosed an electrical device including the aforementioned battery pack. The electrical device herein can be a vehicle, such as an electric car or battery-powered vehicle, or a machining tool, such as an electric drill or electric screwdriver.

Claims

1. A battery pack comprising: CCS component (1); A battery box (2), wherein the CCS assembly (1) is installed and fixed in the battery box (2); A sealant component (3) is provided between the battery case (2) and the CCS assembly (1), and the sealant component (3) extends along the circumferential side of the CCS assembly (1) to seal an assembly gap between the CCS assembly (1) and the battery case (2).

2. The battery pack according to claim 1, wherein: The battery box (2) comprises a lower box (21) and an upper box cover (22) detachably connected to the lower box (21), and the sealant component (3) is constrained between the lower box (21) and the plastic bracket (11) of the CCS assembly (1).

3. The battery pack according to claim 2, wherein: The plastic bracket (11) of the CCS assembly (1) is provided with a sealing groove structure (12), the sealing groove structure (12) extending along the circumferential direction of the plastic bracket (11), and the lower box body (21), the upper box cover (22) and the sealing groove structure (12) are formed into a sealed space, and the sealant component (3) is embedded in the sealed space.

4. The battery pack according to claim 2, wherein: A positioning groove structure is provided on the inner side wall of the lower box body (21), and the positioning groove structure, the upper box cover (22) and the side wall of the plastic bracket (11) are formed into a sealed space, and the sealant component (3) is embedded in the sealed space.

5. The battery pack according to claim 2, wherein: The sealant component (3) is sandwiched between the inner side wall of the lower box (21) and the side wall of the plastic bracket (11).

6. The battery pack according to any one of claims 1 to 5, further comprising a battery pack (4) and a potting colloid (6), wherein a first potting portion (61) of the potting colloid (6) is arranged between the CCS component (1) and the battery case (2), and a top surface of the first potting portion (61) is flush with an electrode external surface of the battery pack (4), the electrode external surface being a side of the battery pack (4) on which an electrode is provided, the battery pack (4) being mounted and fixed inside the battery case (2), and the battery pack (4) being electrically connected to the CCS component (1).

7. The battery pack according to claim 6, further comprising a foam buffer (5), wherein the foam buffer (5) is arranged between the battery box (2) and the battery pack (4).

8. The battery pack according to claim 7, wherein: The potting colloid (6) further includes a second potting portion (62), the second potting portion (62) being arranged between the battery box (2) and the battery pack (4), and the second potting portion (62) extending toward one side of the foam cushioning component (5), and the first potting portion (61) and the second potting portion (62) being integrally formed.

9. The battery pack according to claim 8, wherein: The potting colloid (6) further includes a third potting portion (63), the third potting portion (63) being arranged between the battery box (2) and the battery pack (4), the third potting portion (63) and the foam cushioning component (5) being respectively located on adjacent two side surfaces of the battery pack (4), and the third potting portion (63) and the first potting portion (61) being integrally formed.

10. An electrical device comprising the battery pack according to any one of claims 1 to 9.

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