Battery pack, method for assembling a battery pack, and power consumption device

Abstract

This application belongs to the field of battery technology and discloses a battery pack, a method for assembling a battery pack, and a power consumption device. [Solution] This battery pack includes a battery box, a core assembly, and a BMS. The battery box is provided with a first housing cavity and a second housing cavity that do not communicate with each other. The core assembly is housed in the first housing cavity and includes a core. The BMS is housed in the second housing cavity. When the core experiences thermal runaway and discharges high-temperature, high-pressure gas and particulate matter, the high-temperature, high-pressure gas and particulate matter do not enter the second housing cavity and do not scatter onto the BMS, thus ensuring that the BMS can operate normally during core thermal runaway.

Description

Technical Field

[0001] [Cross - Reference to Related Applications] This application was filed with the China Patent Office on December 23, 2024, and claims the priority of a Chinese patent application with the application number 202411907851.4. All the contents of the above application are incorporated herein by reference. [Technical Field] This application relates to the field of battery technology, particularly to battery packs, methods for assembling battery packs, and power - consuming devices.

Background Art

[0002] Electric vehicles have a good energy - saving and environmental - protection effect compared to traditional fuel - powered vehicles and are already popular among many people. As a core component of electric vehicles, a battery pack usually includes a battery box, battery modules, and a battery monitoring and management system (Battery Monitoring and Management System, BMS). Here, both the battery modules and the BMS are provided inside the battery box.

Summary of the Invention

Problems to be Solved by the Invention

[0003] <第 When the core of the battery module undergoes thermal runaway, the explosion - proof valve of the core opens and ejects high - temperature and high - pressure gas and particulate matter. If the high - temperature and high - pressure gas or particulate matter splashes onto the BMS, the BMS will be damaged, and further, the BMS will be unable to provide a thermal runaway fault signal to the passengers, posing a serious safety concern for electric vehicles. Therefore, in order to solve the above - mentioned technical situation, it is necessary to promptly propose a battery pack, a method for assembling a battery pack, and a power - consuming device.

Means for Solving the Problems

[0004] According to a first aspect, this application provides a battery pack, and the battery pack includes a battery box provided with a first accommodation cavity and a second accommodation cavity that do not communicate with each other, Located within the first containment cavity, the core assembly includes the core assembly, Includes a BMS located within the second containment cavity.

[0005] According to a second aspect, the present application provides a method for assembling the above-mentioned battery pack, the method for assembling the battery pack is: A shelf board is provided, and the shelf board has a first region and a second region distributed along a first direction, and along the second direction, within the first region, the axes of the first core and the second core are both parallel to the first direction, and the first direction is perpendicular to the second direction, and the first core and the second core are fixed together S1. S2 involves welding the electrode of the first core toward the second region to the first connecting piece, and welding the electrode of the second core toward the second region to the first connecting piece. Within the second region, the fourth core is fixed by S3 such that its axis is parallel to the second direction and the fourth core faces the first connecting piece. The method includes S4, which incorporates a shelf into the enclosure such that the first and second regions are located on opposite sides of the flap.

[0006] The third object of this application is to provide a power consumption device including the battery pack described above. [Effects of the Invention]

[0007] The beneficial effects of this application are as follows: The battery pack according to this application divides the internal space of the battery box into a first housing cavity and a second housing cavity that do not communicate with each other, places the core assembly in the first housing cavity and the BMS in the second housing cavity, and when the core experiences thermal runaway and discharges high-temperature, high-pressure gas and particulate matter, the high-temperature, high-pressure gas and particulate matter do not enter the second housing cavity and are not scattered onto the BMS, thus ensuring that the BMS can operate normally when the core experiences thermal runaway. [Brief explanation of the drawing]

[0008] [Figure 1]This is a schematic diagram of the explosion structure of the battery pack covered by this application. [Figure 2] This is a schematic diagram of the structure of the battery pack covered by this application. [Figure 3] Figure 2 is a schematic diagram of the FF cross-sectional structure. [Figure 4] This is a schematic diagram of a portion of A in Figure 3. [Figure 5] This is a first structural schematic diagram of the housing and core assembly relating to this application. [Figure 6] This is a second schematic diagram of the housing and core assembly relating to this application. [Figure 7] This is a schematic diagram of the first structure of the shelf board and core assembly relating to this application. [Figure 8] This is a schematic diagram of the shelf structure related to this application. [Figure 9] This is a second schematic diagram of the shelf board and core assembly relating to this application. [Modes for carrying out the invention]

[0009] This embodiment provides a battery pack in which high-temperature, high-pressure gas and particulate matter discharged during core thermal runaway do not scatter onto the BMS.

[0010] Specifically, as shown in Figures 1 to 3, this battery pack includes a battery box 100, a core assembly 200, and a BMS 300, where the battery box 100 is provided with a first housing cavity 110 and a second housing cavity 120 that do not communicate with each other, the core assembly 200 is provided in the first housing cavity 110 and includes a core, and the BMS 300 is provided in the second housing cavity 120.

[0011] This battery pack divides the internal space of the battery box 100 into a first housing cavity 110 and a second housing cavity 120 that do not communicate with each other. The core assembly 200 is placed in the first housing cavity 110, and the BMS 300 is placed in the second housing cavity 120. In the event that the core experiences thermal runaway and discharges high-temperature, high-pressure gas and particulate matter (hereinafter referred to as the high-temperature medium), the high-temperature medium will not enter the second housing cavity 120, nor will it be scattered onto the BMS 300, thus ensuring that the BMS 300 can operate normally even when the core experiences thermal runaway.

[0012] Optionally, the battery pack further includes a Harness Board Integration (Cells Contact System, CCS), the CCS400 including a shelf 410, which is sealed and partitioned within the battery box 100, forming a first housing cavity 110 and a second housing cavity 120 within the battery box 100. This structural design utilizes the shelf 410 of the CCS400 to form a first housing cavity 110 and a second housing cavity 120 that do not communicate with each other within the battery box 100, eliminating the need to add other separators or partitions, fully utilizing the internal space of the battery box 100, and is advantageous for improving the energy density of the battery pack.

[0013] The battery box 100 includes a case cover 130 that engages with and connects to the housing 140, and the housing 140. The shelf 410 is provided inside the housing 140, and a sealing material 500 is provided on the edge of the shelf 410. The sealing material 500 extends along the circumferential direction of the shelf 410 and has a head and tail connected, and the shelf 410 is sealedly connected to the inner wall of the housing 140 via the sealing material 500, thereby achieving a seal between the shelf 410 and the housing 140, and preventing the high-temperature medium discharged from the core in the first housing cavity 110 from entering the second housing cavity 120 and affecting the BMS 300, thereby achieving isolation between the core assembly 200 and the BMS 300.

[0014] As shown in FIGS. 3 and 4, a second protrusion 413 is provided on the edge of the shelf board 410 facing the case cover 130. The second protrusion 413 extends along the circumferential direction of the shelf board 410, with its head and tail connected. The sealing material 500 is filled between the second protrusion 413 and the inner wall of the housing 140 to improve the sealing reliability between the shelf board 410 and the housing 140.

[0015] Optionally, the BMS 300 is fixed to the side of the case cover 130 facing the shelf board 410, which improves the integration degree of the battery pack and is further beneficial to improving the energy density of the battery pack.

[0016] In this embodiment, the sealing material 500 is a sealant, which can realize the sealing between the shelf board 410 and the housing 140, and at the same time, the shelf board 410 and the housing 140 can be adhered and integrated. Of course, in other embodiments, the sealing material 500 may be a sealing ring. And in other embodiments, the sealing material 500 may be interposed between the side wall of the shelf board 410 and the inner wall of the housing 140.

[0017] Optionally, a first protrusion 131 is provided on the side of the case cover 130 facing the housing 140. The first protrusion 131 extends along the circumferential direction of the case cover 130, with its head and tail connected. The first protrusion 131 is inserted into the sealing material 500 to realize the sealing between the shelf board 410 and the case cover 130. While sealing between the shelf board 410 and the housing 140, by adding a sealing structure between the shelf board 410 and the case cover 130, it is beneficial to improve the sealing performance between the first accommodation cavity 110 and the second accommodation cavity 120, and it is possible to avoid the high-temperature medium discharged from the core in the first accommodation cavity 110 from entering the second accommodation cavity 120 and affecting the BMS 300. And in this embodiment, the sealing material 500 is a sealant. By inserting the first protrusion 131 of the case cover 130 into the sealant, the shelf board 410 and the case cover 130 are integrated by adhesion, that is, the housing 140, the case cover 130 and the shelf board 410 are jointly integrated, improving the consistency and structural strength of the overall structure of the battery pack.

[0018] Optionally, as shown in FIGS. 5 and 6, a flap 141 is provided inside the housing 140, cores are provided on both sides of the flap 141, and when the core on the flap 141 side undergoes thermal runaway, the flap 141 can achieve a certain heat insulation effect and reduce the probability of heat diffusion.

[0019] Optionally, the axes of the cores located on both sides of the flap 141 are not parallel. This structural design may be used when the internal space of the housing 140 is relatively small or when other components are further provided in the housing 140 and it is necessary to avoid positions. In this embodiment, the overall structure of the core assembly 200 is made relatively regular, the core axes on both sides of the flap 141 are perpendicular to each other, which is beneficial to improving the utilization rate of the internal space of the housing 140. Of course, in other embodiments, the axes of the cores on both sides of the flap 141 may be provided at an included angle.

[0020] A first explosion-proof valve 251 is provided at the position of the core located on the flap 141 side facing the flap 141. When the first explosion-proof valve 251 opens and discharges the high-temperature medium, the flap 141 can achieve a good blocking effect, prevent the high-temperature medium from splashing onto the core on the other side of the flap 141, and reduce the probability of heat diffusion. <匡

[0021] It should be pointed out that in other embodiments, when the core axes on both sides of the flap 141 are parallel, the first explosion-proof valve 251 may be provided on both sides of the core on both sides of the flap 141 facing the flap 141.

[0022] Selectively, a first gap 610 is left between the first explosion-proof valve 251 and the flap 141, and a second gap 620 is left between each core and the inner wall of the housing 140. Both sides of the flap 141 are spaced apart from the inner wall of the housing 140 so that the first gap 610 and the second gap 620 communicate to form an exhaust passage. The housing 140 is provided with a fifth explosion-proof valve 142, and the exhaust passage communicates with the fifth explosion-proof valve 142. When one or more cores experience thermal runaway and discharge a high-temperature medium, the high-temperature medium flows through the exhaust passage to the fifth explosion-proof valve 142 and is discharged from the fifth explosion-proof valve 142 to the first housing cavity 110, thereby reducing the probability of the battery pack exploding and achieving enhanced battery pack safety.

[0023] Each core is equipped with an explosion-proof valve at both ends to achieve the effect of rapid exhaust.

[0024] In this embodiment, three cores are provided on one side of the flap 141, and one core is provided on the other side of the flap 141. For ease of understanding, the three cores located on one side of the flap 141 are referred to as the first core 210, the second core 220, and the third core 230, respectively, and the core located on the other side of the flap 141 is referred to as the fourth core 240. Here, the first core 210, the second core 220, and the fourth core 240 are all provided facing the flap 141, the third core 230 and the flap 141 are provided offset from each other, and the first explosion-proof valve 251 is provided on the side of the first core 210 and the second core 220 facing the flap 141. A first gap 610 is left between the first explosion-proof valve 251 and the flap 141, a second explosion-proof valve 252 is provided on the side of the first core 210 and the second core 220 away from the flap 141, a third explosion-proof valve 253 is provided on both sides of the third core 230, and a fourth explosion-proof valve 254 is provided on both sides of the fourth core 240. A second gap 620 is left between the second explosion-proof valve 252 and the inner wall of the housing 140, between the third explosion-proof valve 253 and the inner wall of the housing 140, and between the fourth explosion-proof valve 254 and the inner wall of the housing 140, thereby forming an exhaust passage inside the housing 140 (i.e., inside the first housing cavity 110).

[0025] This embodiment further provides a method for assembling a battery pack, which is used to assemble the aforementioned battery pack and has the effect of reducing the difficulty of assembly and improving assembly efficiency.

[0026] Specifically, as shown in Figures 7 to 9, the assembly method for this battery pack is as follows: A shelf board 410 is provided, wherein the shelf board 410 has a first region 411 and a second region 412 distributed along a first direction D1, and along a second direction D2, the axes of the first core 210 and the second core 220 are both parallel to the first direction D1 within the first region 411, and the first direction D1 is perpendicular to the second direction D2, and S1 is used to fix the first core 210 and the second core 220. S2 involves welding the electrode of the first core 210 toward the second region 412 to the first connecting piece 710, and welding the electrode of the second core 220 toward the second region 412 to the first connecting piece 710, Within the second region 412, the fourth core 240 is fixed by S3 such that its axis is parallel to the second direction D2 and the fourth core 240 faces the first connecting piece 710. S4 includes incorporating the shelf 410 into the housing 140 such that the first region 411 and the second region 412 are located on either side of the flap 141, and the shelf 410 forms a first housing cavity 110 between the shelf 410 and the housing 140. This battery pack assembly method is advantageous in improving the assembly efficiency of the battery pack by first welding the first connecting piece 710 to the electrode of the first core 210 facing the second region 412, and then welding the first connecting piece 710 to the electrode of the second core 220 facing the second region 412, and then fixing the fourth core 240 to the shelf 410 before welding the first connecting piece 710, compared to the method in this embodiment where the first connecting piece 710 to the first core 210 and the second core 220 is first welded to the electrode of the first connecting piece 710 to the first core 210 and the second core 220.

[0027] Optionally, step S1 further includes fixing the third core 230 within the first region 411 such that the third core 230 is located on the side of the second core 220 away from the first core 210, and the axis of the third core 230 is parallel to the first direction D1.

[0028] Step S2 further includes welding the electrode facing the second region 412 of the third core 230 to the second connecting piece 720, which is an L-shaped connecting piece.

[0029] Step S3 further includes welding the electrode of the fourth core 240 toward the second connecting piece 720 to the second connecting piece 720.

[0030] After welding the third connecting piece 730 to the electrode of the third core 230 facing the second region 412, the fourth core 240 is fixed to the shelf 410, and finally the electrode of the fourth core 240 facing the second connecting piece 720 is welded to the second connecting piece 720. This design is advantageous for quickly determining the fixing position of the fourth core 240 on the shelf 410, and has the effect of improving assembly efficiency. Furthermore, this design can reduce the decrease in welding strength between the second connecting piece 720 and the third core 230 and the fourth core 240 due to excessive misalignment between the third core 230 and the fourth core 240, compared to first fixing the fourth core 240 to the shelf 410 and then welding the second connecting piece 720.

[0031] Optionally, step S2 further includes welding the electrode of the second core 220 away from the second region 412 to the third connecting piece 730, welding the electrode of the third core 230 away from the second region 412 to the third connecting piece 730, drilling a fourth connecting piece 740 on the side of the first region 411 away from the second region 412, welding the electrode of the first core 210 away from the second region 412 to the fourth connecting piece 740, and within the second region 412, passing a fifth connecting piece 750 through the shelf plate 410 and providing the fifth connecting piece 750 and the second connecting piece 720 facing each other.

[0032] Step S3 involves fixing the fourth core 240 between the second connecting piece 720 and the fifth connecting piece 750, and welding the electrode of the fourth core 240 facing the fifth connecting piece 750 to the fifth connecting piece 750. In other words, after all the cores, connecting pieces and the shelf board 410 have been connected, the step further involves fixing the fourth core 240 to the shelf board 410.

[0033] Optionally, step S4 further includes applying fixing rubber to the bottom of the housing 140 before assembling the shelf 410 into the housing 140, then assembling the shelf 410 into the housing 140, and bonding the first core 210, second core 220, third core 230 and fourth core 240 to the bottom of the housing 140 with fixing rubber, and further including that the first core 210, second core 220 and third core 230 are all located on the same side of the flap 141 and the fourth core 240 is located on the other side of the flap 141.

[0034] The assembly method for this battery pack further includes S5, which involves filling a sealant between the second protrusion 413 and the inner wall of the housing 140 to achieve a seal between the shelf 410 and the housing 140.

[0035] The assembly method of this battery pack further includes S6, which involves engaging the case cover 130 on which the BMS 300 is fixed with the housing 140, inserting the first projection 131 into the sealant, achieving a seal between the shelf 410 and the case cover 130, and forming a second housing cavity 120 between the shelf 410 and the case cover 130.

[0036] As shown in Figure 1, the assembly method of this battery pack further includes S7, which involves sequentially drilling a first through hole 132 and a BMS 300 in the first conductive member 810, and fixing the fourth connecting piece 740 to the BMS 300 so that the BMS 300 is electrically connected to the BMS 300 via the first conductive member 810, and sequentially drilling a second through hole 133 and a BMS 300 in the second conductive member 820, and fixing the fifth connecting piece 750 to the BMS 300 so that the BMS 300 is electrically connected to the BMS 300 via the second conductive member 820.

[0037] The assembly method of this battery pack further includes S8, which involves adhesively sealing the first seal cover 830 to the first through hole 132 and the second seal cover 840 to the second through hole 133 to achieve a seal of the second housing cavity 120.

[0038] This embodiment further provides a power consumption device which includes the battery pack described above, and in the event that the core in the battery pack experiences thermal runaway and discharges a high-temperature medium, the probability of the BMS 300 being damaged is relatively low, and furthermore, the BMS 300 issues a thermal runaway failure signal to the user, thereby enabling this power consumption device to have relatively high safety in use.

[0039] It should be noted that this power-consuming device may also be a vehicle, mobile phone, portable device, laptop computer, steamship, spacecraft, electric toy, power tool, etc. [Explanation of Symbols]

[0040] 100, Battery box, 110, First housing cavity, 120, Second housing cavity, 130, Case cover, 131, First protrusion, 132, First through hole, 133, Second through hole, 140, Housing, 141, Flap, 142, Fifth explosion-proof valve, 200, Core assembly, 210, First core, 220, Second core, 230, Third core, 240, Fourth core, 251, First explosion-proof valve, 252, Second explosion-proof valve, 253, Third explosion-proof valve, 254, Fourth explosion-proof valve, 30 0, BMS, 400, CCS, 410, shelf, 411, first area, 412, second area, 413, second protrusion, 500, sealant, 610, first gap, 620, second gap, 710, first connecting piece, 720, second connecting piece, 730, third connecting piece, 740, fourth connecting piece, 750, fifth connecting piece, 810, first conductive member, 820, second conductive member, 830, first seal cover, 840, second seal cover, D1, first direction, D2, second direction.

Claims

1. It is a battery pack, A battery box (100) is provided with a first housing cavity (110) and a second housing cavity (120) that do not communicate with each other, A core assembly (200) including a core is provided within the first housing cavity (110), A battery pack including a BMS (300) provided in the second housing cavity (120).

2. The battery pack according to claim 1, further comprising a CCS (400) including a shelf (410), wherein the shelf (410) is sealedly partitioned within the battery box (100) to form a first housing cavity (110) and a second housing cavity (120) within the battery box (100).

3. The battery pack according to claim 2, wherein the battery box (100) includes a case cover (130) engaged with and connected to a housing (140), the shelf plate (410) is provided inside the housing (140), a sealing material (500) is provided on the edge of the shelf plate (410), the sealing material (500) extends along the circumferential direction of the shelf plate (410) and has a head and tail connected, the shelf plate (410) is sealedly connected to the inner wall of the housing (140) via the sealing material (500), the first housing cavity (110) is located between the shelf plate (410) and the housing (140), and the second housing cavity (120) is located between the shelf plate (410) and the case cover (130).

4. The battery pack according to claim 3, wherein a first projection (131) is provided on the side of the case cover (130) facing the housing (140), the first projection (131) extends along the circumferential direction of the case cover (130), its head and tail are connected, and the first projection (131) is inserted into the sealing material (500).

5. The battery pack according to claim 3, wherein a flap (141) is provided inside the housing (140), and the core is provided on both sides of the flap (141).

6. The battery pack according to claim 5, wherein at least the core located on the flap (141) side is provided with a first explosion-proof valve (251) facing the flap (141).

7. A first gap (610) is left between the first explosion-proof valve (251) and the flap (141), a second gap (620) is left between each of the cores and the inner wall of the housing (140), both sides of the flap (141) are spaced apart from the inner wall of the housing (140) so that the first gap (610) and the second gap (620) communicate to form an exhaust passage, and the housing (140) is provided with a fifth explosion-proof valve (142), and the exhaust passage communicates with the fifth explosion-proof valve (142), as described in claim 6.

8. The battery pack according to claim 5, wherein the axes of the cores located on both sides of the flap (141) are not parallel.

9. A method for assembling a battery pack according to claim 8, The shelf board (410) is provided, wherein the shelf board (410) has a first region (411) and a second region (412) distributed along a first direction (D1), and along a second direction (D2), the axes of the first core (210) and the second core (220) are both parallel to the first direction (D1), and the first core (210) and the second core (220) are fixed within the first region (411) such that the first direction (D1) is perpendicular to the second direction (D2), S1 S2 involves welding the electrode of the first core (210) facing the second region (412) to the first connecting piece (710), and welding the electrode of the second core (220) facing the second region (412) to the first connecting piece (710), S3 fixes the fourth core (240) within the second region (412) such that the axis of the fourth core (240) is parallel to the second direction (D2) and the fourth core (240) faces the first connecting piece (710), An assembly method comprising S4, which involves assembling the shelf board (410) into the housing (140) such that the first region (411) and the second region (412) are located on opposite sides of the flap (141).

10. A power consumption device including a battery pack according to any one of claims 1 to 8.

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