Battery pack and electrical device

Abstract

Battery pack characterized in that it comprises the following: a battery housing (100) having a first receiving chamber (110) and a second receiving chamber (120), wherein the first receiving chamber (110) and the second receiving chamber (120) are separate from each other and not connected to each other; a battery cell assembly (200) arranged in the first receiving space (110), wherein the battery cell assembly (200) comprises battery cells; a battery management system (300) located in the second recording space (120).

Description

[0001] This application claims priority over the Chinese patent application with application number 202411907851.4, filed with the Chinese Patent Office on December 23, 2024, the entire contents of which are incorporated in full into the present application by reference. Technical field

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

[0003] Compared to vehicles with conventional drive systems, electric vehicles offer improved energy efficiency and environmental protection and are enjoying increasing popularity. The battery pack, as the core component of an electric vehicle, typically comprises a battery housing, battery modules, and a battery monitoring and management system (BMS). Both the battery modules and the BMS are located within the battery housing. Content of the present application: TECHNICAL PROBLEM

[0004] If a battery cell in the battery module experiences thermal runaway, the cell's safety valve opens, expelling gas and particles at high temperature and pressure. If this gas and these particles, also at high temperature and pressure, reach the battery management system (BMS), it will be damaged. As a result, the BMS will be unable to transmit information about the thermal runaway to the vehicle occupants, posing a significant safety hazard.

[0005] Therefore, there is an urgent need for a battery pack, a method for assembling a battery pack, and an electrical device to solve the aforementioned technical problem. TECHNICAL SOLUTIONS

[0006] According to a first aspect, the present application provides a battery pack which comprises the following:

[0007] A battery housing comprising a first receiving chamber and a second receiving chamber, wherein the first receiving chamber and the second receiving chamber are separate from each other and not connected to each other;

[0008] A battery cell assembly which is arranged in the first receiving space, wherein the battery cell assembly comprises battery cells;

[0009] A BMS located in the second recording room.

[0010] For clarification, a procedure for assembling the aforementioned battery pack is described. The procedure for assembling a battery pack comprises the following steps: S1: Provision of a carrier plate, wherein the carrier plate has a first region and a second region in a first direction; fixing a first battery cell and a second battery cell along a second direction in the first region such that the axes of the first and second battery cells are parallel to the first direction, the first direction being perpendicular to the second direction; S2: Welding the electrode of the first battery cell facing the second area to a first connection tab, and welding the electrode of the second battery cell facing the second area to a first connection tab; S3: Fixing a fourth battery cell in the second area, wherein the axis of the fourth battery cell runs parallel to the second direction and the fourth battery cell is directly opposite the first connecting tab; S4: Inserting the carrier plate into the battery housing so that the first area and the second area are each located on opposite sides of a partition plate.

[0011] A third aspect of the present application is to provide an electrical device comprising the aforementioned battery pack. TECHNICAL IMPACTS

[0012] The present application offers the following advantageous effects: By separating the interior of the battery housing into a first and a second, separate receiving space, as proposed in the present application, with the battery cell assembly located in the first receiving space and the BMS in the second receiving space, it is ensured that, in the event of thermal runaway of the battery cells, the gases and particles emitted under high temperature and high pressure cannot penetrate into the second receiving space and thus cannot damage the BMS. This ensures that the BMS continues to function properly even in the event of thermal runaway of the battery cells. Brief description of the drawing Fig. 1 is an exploded view of the battery pack provided in the present application; Fig. Figure 2 is a schematic structural view of the battery pack provided in the present application; Fig. Figure 3 is a schematic sectional view along section FF in Fig. 2; Fig. Figure 4 is an enlarged schematic partial view at point A in Fig. 3; Fig. Figure 5 is a first schematic structural view of the housing and battery cell assembly provided in the present application; Fig. Figure 6 is a second schematic structural view of the housing and battery cell assembly provided in the present application; Fig. Figure 7 is a first schematic structural view of the carrier plate and battery cell assembly provided in the present application; Fig. Figure 8 is a schematic structural view of the carrier plate provided in the present application; Fig. Figure 9 is a second schematic structural view of the carrier plate and battery cell assembly provided in the present application.

[0013] In the figures: 100, battery housing; 110, first receiving chamber; 120, second receiving chamber; 130, housing cover; 131, first projection; 132, first through-hole; 133, second through-hole; 140, housing body; 141, partition plate; 142, fifth safety valve; 200, battery cell assembly; 210, first battery cell; 220, second battery cell; 230, third battery cell; 240, fourth battery cell; 251, first safety valve; 252, second safety valve; 253, third safety valve; 254, fourth safety valve; 300, BMS; 400, CCS; 410, carrier plate; 411, first area; 412, second area; 413, second projection; 500, sealing element; 610, first gap; 620, second gap; 710, first connecting tab; 720, second connecting tab; 730, third connecting tab; 740, fourth connecting tab; 750, fifth connecting tab; 810, first conduit element; 820, second conduit element; 830, first sealing cover; 840, second sealing cover; D1, first direction; D2, second direction. Detailed description of the embodiments

[0014] According to one embodiment, a battery pack is provided in which the gases and particles emitted during the thermal runaway of a battery cell under high temperature and high pressure are not sprayed onto the BMS.

[0015] Specifically, the battery pack comprises, as described in the Fig. Figures 1 to 3 show a battery housing 100, a battery cell assembly 200, and a BMS 300. The battery housing 100 is provided with a first receiving space 110 and a second receiving space 120, the first receiving space 110 and the second receiving space 120 being separate from each other and not connected. The battery cell assembly 200 is arranged in the first receiving space 110 and comprises battery cells. The BMS 300 is arranged in the second receiving space 120.

[0016] This arrangement divides the interior of the battery housing 100 into two separate receiving compartments, namely the first receiving compartment 110 and the second receiving compartment 120. The battery cell assembly 200 is located in the first receiving compartment 110, and the BMS 300 is located in the second receiving compartment 120. If gases and particles escape under high temperature and high pressure (hereinafter referred to as the "high-temperature medium") during thermal runaway of a battery cell, the high-temperature medium does not enter the second receiving compartment 120, thus preventing splashing onto the BMS 300. This ensures that the BMS 300 can continue to operate normally even during thermal runaway of the battery cells.

[0017] Optionally, the battery pack also includes an integrated cable harness panel element 400 (Cells Contact System, CCS). The CCS 400 comprises a carrier plate 410. The carrier plate 410 is arranged in a sealing manner within the battery housing 100, so that the first receiving compartment 110 and the second receiving compartment 120 are formed within the battery housing 100. This design makes it possible to create two separate receiving compartments (first receiving compartment 110 and second receiving compartment 120) within the battery housing 100 using the carrier plate 410 of the CCS 400, without the need for additional partition plates or other sealing elements. This ensures optimal use of the interior space of the battery housing 100, which contributes to increasing the energy density of the battery pack.

[0018] The battery housing 100 comprises a housing cover 130 and a housing body 140. The housing cover 130 and the housing body 140 are interlocked. The carrier plate 410 is located inside the housing body 140. A sealing element 500 is located at the edge of the carrier plate 410, extending around its circumference, and its ends are connected. The carrier plate 410 is sealed to the inner wall of the housing body 140 by means of the sealing element 500, thus creating a seal between the carrier plate 410 and the housing body 140. This prevents the high-temperature medium, which escapes from the battery cells in the first receiving chamber 110, from entering the second receiving chamber 120 and affecting the BMS 300. Effective separation between the battery cell assembly 200 and the BMS 300 is therefore ensured.

[0019] As in the Fig. 3 and Fig. As shown in Figure 4, the support plate 410 has a second projection 413 at its edge facing the housing cover 130. The second projection 413 extends around the circumference of the support plate 410 and is completely closed. The sealing element 500 is arranged between the second projection 413 and the inner wall of the housing body 140, thereby further increasing the reliability of the seal between the support plate 410 and the housing body 140.

[0020] Optionally, the BMS 300 is attached to the side of the housing cover 130 facing the carrier plate 410 in order to increase the level of integration of the battery pack and thereby improve the energy density of the battery pack.

[0021] In the present embodiment, the sealing element 500 is designed as a sealant. This not only creates a seal between the carrier plate 410 and the housing body 140, but also establishes an adhesive bond, so that the carrier plate 410 and the housing body 140 are joined to form a single unit. Of course, in other embodiments, the sealing element 500 can also be a sealing ring. Furthermore, in other embodiments, the sealing element 500 can be clamped between the side wall of the carrier plate 410 and the inner wall of the housing body 140.

[0022] Optionally, a first projection 131 is arranged on the side of the housing cover 130 facing the housing body 140. The first projection 131 extends around the circumference of the housing cover 130 and is closed. The first projection 131 is inserted into the sealing element 500 to create a seal between the carrier plate 410 and the housing cover 130. This additional sealing structure between the carrier plate 410 and the housing cover 130 further improves the seal between the first receiving chamber 110 and the second receiving chamber 120, thus preventing high-temperature media escaping from the first receiving chamber 110 from entering the second receiving chamber 120 and affecting the BMS 300. In the present embodiment, the sealing element 500 is designed as a sealant, with the first projection 131 of the housing cover 130 being inserted into this sealant.This causes the carrier plate 410 and the housing cover 130 to be bonded together as a single unit, so that the housing body 140, housing cover 130 and carrier plate 410 together form an integrated unit. This increases the structural integrity and strength of the entire battery pack.

[0023] Optional, as in the Fig. 5 and Fig. Figure 6 shows a partition plate 141 arranged in the housing body 140. Battery cells are arranged on both sides of the partition plate 141. If one of the battery cells on one side of the partition plate 141 experiences thermal runaway, the partition plate 141 acts as a thermal barrier and thus reduces the probability of thermal propagation.

[0024] Optionally, the axes of the battery cells arranged on both sides of the partition plate 141 are not parallel to each other. This design is particularly suitable when the interior space of the housing body 140 is limited or when other components within the housing body 140 must be taken into account. In the present embodiment, the axes of the battery cells on both sides of the partition plate 141 are arranged perpendicular to each other, so that the battery cell assembly 200 is compact and neatly structured overall, thereby improving the space utilization within the housing body 140. Of course, in other embodiments, the axes of the battery cells on both sides of the partition plate 141 can also form any desired angle to each other.

[0025] The battery cells located on one side of the partition plate 141 are equipped with the first safety valve 251 at the position facing the partition plate 141. When the first safety valve 251 opens and a high-temperature medium escapes, the partition plate 141 achieves a good containment effect. This prevents the high-temperature medium from splashing onto the battery cells on the opposite side of the partition plate 141 and reduces the probability of thermal spread.

[0026] It should be noted that in other embodiments, in which the axes of the battery cells on both sides of the separating plate 141 run parallel, all battery cells on both sides of the separating plate 141 may each be provided with a first safety valve 251 at the position facing the separating plate 141.

[0027] Optionally, a first gap 610 is arranged between the first safety valve 251 and the separating plate 141. Furthermore, a second gap 620 is arranged between each battery cell and the inner wall of the housing body 140. The separating plate 141 is positioned at a distance from the inner wall of the housing body 140 on both sides, so that the first gap 610 and the second gap 620 are connected to each other and form a vent channel. The housing body 140 has a fifth safety valve 142, which is connected to the vent channel. If the high-temperature medium escapes due to thermal runaway in one or more battery cells, the high-temperature medium can reach the fifth safety valve 142 via the vent channel and then be discharged from the first receiving chamber 110, thereby reducing the risk of explosion and increasing the safety of the battery pack.

[0028] Each battery cell is equipped with safety valves at both ends to allow for rapid venting.

[0029] In the present embodiment, three battery cells are located on one side of the partition plate 141 and one battery cell on the other side. For clarity, the three battery cells on one side of the partition plate 141 are designated as the first battery cell 210, the second battery cell 220, and the third battery cell 230, while the battery cell on the other side is designated as the fourth battery cell 240. The first battery cell 210, the second battery cell 220, and the fourth battery cell 240 are each arranged opposite the partition plate 141, while the third battery cell 230 is arranged offset from the partition plate 141. The first battery cell 210 and the second battery cell 220 each have a first safety valve 251 facing the partition plate 141, and the first gap 610 is arranged between the first safety valve 251 and the partition plate 141.The first battery cell 210 and the second battery cell 220 each have a second safety valve 252 on the side facing away from the separating plate 141. The third battery cell 230 has a third safety valve 253 on each side; the fourth battery cell 240 has a fourth safety valve 254 on each side. A second gap 620 is arranged between the second safety valve 252 and the inner wall of the housing body 140, between the third safety valve 253 and the inner wall of the housing body 140, and between the fourth safety valve 254 and the inner wall of the housing body 140, thus forming a vent channel inside the housing body 140 (i.e., within the first receiving space 110).

[0030] An example of a method for assembling a battery pack is described. This method is used to assemble the battery pack described above and offers the advantage of reducing assembly complexity and increasing assembly efficiency.

[0031] In detail, as in the Fig. As shown in Figures 7 to 9, the procedure for assembling a battery pack comprises the following steps: S1: Providing the carrier plate 410, which has a first area 411 and a second area 412 along a first direction D1; fixing the first battery cell 210 and second battery cell 220 in the first area 411 along a second direction D2, wherein their axes are each parallel to the first direction D1 and the first direction D1 is perpendicular to the second direction D2; S2: Welding the electrodes of the first battery cell 210 directed towards the second area 412 to a first connecting tab 710, and welding the electrodes of the second battery cell 220 directed towards the second area 412 to a first connecting tab 710; S3: Fixing the fourth battery cell 240 in the second area 412, whose axis runs parallel to the second direction D2 and is opposite the first connecting tab 710; S4: Inserting the carrier plate 410 into the housing body 140, so that the first area 411 and the second area 412 are located on both sides of the partition plate 141 and the first receiving space 110 is formed between the carrier plate 410 and the housing body 140.

[0032] In the battery pack assembly process, before the fourth battery cell 240 is attached to the carrier plate 410, the first connecting tab 710 is welded to the electrode of the first battery cell 210 that faces the second area 412. The first connecting tab 710 is then welded to the electrode of the second battery cell 220 that faces the second area 412. Compared to a procedure in which the fourth battery cell 240 is first attached to the carrier plate 410 and then the first connecting tab 710 is welded, the assembly sequence described here reduces the difficulty of welding the first connecting tab 710 to the first battery cell 210 and the second battery cell 220. This thus increases the assembly efficiency of the battery pack.

[0033] Optionally, step S1 additionally includes: fixing the third battery cell 230 in the first area 411, wherein the third battery cell 230 is arranged on the side of the second battery cell 220 facing away from the first battery cell 210 and the axis of the third battery cell 230 runs parallel to the first direction D1.

[0034] Step S2 additionally includes: welding the electrode of the third battery cell 230, which is directed towards the second area 412, to a second connecting tab 720, wherein the second connecting tab 720 is an L-shaped connecting tab.

[0035] Step S3 additionally includes: welding the electrode of the fourth battery cell 240, which is directed towards the second terminal 720, to the second terminal 720.

[0036] After the third connecting tab 730 is welded to the electrode of the third battery cell 230 facing the second area 412, the fourth battery cell 240 is then attached to the carrier plate 410, and finally the electrode of the fourth battery cell 240 facing the second connecting tab 720 is welded to the second connecting tab 720. This procedure facilitates the precise location of the mounting position of the fourth battery cell 240 on the carrier plate 410 and thus increases assembly efficiency.Compared to a procedure in which the fourth battery cell 240 is first attached to the carrier plate 410 and then the second connecting tab 720 is welded, this design reduces the risk that, due to larger positional deviations between the third battery cell 230 and the fourth battery cell 240, the weld strength between the second connecting tab 720 and the third battery cell 230 as well as between the second connecting tab 720 and the fourth battery cell 240 is impaired.

[0037] Optionally, step S2 additionally includes: welding the electrode of the second battery cell 220, facing away from the second area 412, to a third terminal 730, and welding the electrode of the third battery cell 230, facing away from the second area 412, to a third terminal 730; inserting a fourth terminal 740 on the side of the first area 411 facing away from the second area 412 and welding the electrode of the first battery cell 210, facing away from the second area 412, to this fourth terminal 740; in the second area 412, the fifth terminal 750 is guided through the carrier plate 410 and arranged so that it is opposite the second terminal 720.

[0038] Step S3 additionally includes: attaching the fourth battery cell 240 between the second terminal 720 and the fifth terminal 750, and welding the electrode of the fourth battery cell 240, which is directed towards the fifth terminal 750, to the fifth terminal 750. In other words: only after all battery cells and terminals have been connected to the carrier plate 410 is the fourth battery cell 240 attached to the carrier plate 410.

[0039] Optionally, step S4 additionally includes: Before inserting the carrier plate 410 into the housing body 140, a fixing adhesive is applied to the bottom of the housing body 140. The carrier plate 410 is then inserted into the housing body 140, so that the first battery cell 210, the second battery cell 220, the third battery cell 230, and the fourth battery cell 240 are each secured to the bottom of the housing body 140 by means of the fixing adhesive. The first, second, and third battery cells 210, 220, 230 are located on the same side of the separating plate 141, while the fourth battery cell 240 is located on the opposite side.

[0040] This assembly procedure further includes step S5: the application of a sealant between the second projection 413 and the inner wall of the housing body 140 to ensure a seal between the carrier plate 410 and the housing body 140.

[0041] Furthermore, the procedure includes step S6: attaching the housing cover 130, to which the BMS 300 is attached, to the housing body 140, whereby the first projection 131 is inserted into the sealant to create a seal between the housing cover 130 and the carrier plate 410. This creates the second receiving space 120 between the carrier plate 410 and the housing cover 130.

[0042] As in Fig.As shown in Figure 1, the procedure further comprises step S7: Inserting a first conductor element 810 successively through the first through-opening 132 and the BMS 300 and connecting it to the fourth terminal 740, so that the fourth terminal 740 is electrically connected to the BMS 300 by means of the first conductor element 810; Inserting a second conductor element 820 successively through the second through-opening 133 and the BMS 300 and connecting the second conductor element 820 to the fifth terminal 750, so that the fifth terminal 750 is electrically connected to the BMS 300 by means of the second conductor element 820.

[0043] Furthermore, the procedure includes step S8: Bonding and sealing a first sealing cover 830 at the first through-opening 132 and a second sealing cover 840 at the second through-opening 133 to seal the second receiving chamber 120.

[0044] The present embodiment also provides an electrical device comprising the battery pack described above. If battery cells within the battery pack experience thermal runaway and leak high-temperature media, the probability of damage to the BMS 300 is low. Thus, the BMS 300 can reliably send a signal of a thermal malfunction to the user, thereby increasing the operational reliability of the electrical device.

[0045] It should be noted that the electrical device could be, for example, a vehicle, a mobile phone, a portable device, a laptop, a ship, a spacecraft, an electric toy, or an electric tool. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 202411907851.4

[0001]

Claims

[1] Battery pack, characterized by , that it includes the following: a battery housing (100) having a first receiving chamber (110) and a second receiving chamber (120), wherein the first receiving chamber (110) and the second receiving chamber (120) are separate from each other and not connected to each other; a battery cell assembly (200) arranged in the first receiving space (110), wherein the battery cell assembly (200) comprises battery cells; a battery management system (300) located in the second recording space (120). [2] Battery pack according to claim 1, wherein the battery pack further comprises a CCS (400), wherein the CCS (400) has a carrier plate (410) which is arranged sealingly inside the battery housing (100) to form the first receiving space (110) and the second receiving space (120) in the battery housing (100). [3] Battery pack according to claim 2, wherein the battery housing (100) comprises a housing cover (130) and a housing body (140), wherein the housing cover (130) is connected to the housing body (140) in a snap-fit ​​manner, wherein the support plate (410) is arranged in the housing body (140), wherein the support plate (410) has a sealing element (500) at its edge, which is formed circumferentially along the circumference of the support plate (410) and the ends of which are connected to each other, wherein the support plate (410) is tightly connected to the inner wall of the housing body (140) by means of the sealing element (500), wherein the first receiving space (110) is formed between the support plate (410) and the housing body (140) and the second receiving space (120) is formed between the support plate (410) and the housing cover (130). [4] Battery pack according to claim 3, wherein the housing cover (130) has a first projection (131) on its side facing the housing body (140), wherein the first projection (131) is circumferential and closed along the circumference of the housing cover (130) and wherein the first projection (131) engages in the sealing element (500). [5] Battery pack according to claim 3, wherein a partition plate (141) is arranged in the housing body (140), wherein battery cells are arranged on both sides of the partition plate (141). [6] Battery pack according to claim 5, wherein at least the battery cells arranged on one side of the separating plate (141) each have a first safety valve (251) at the position facing the separating plate (141). [7] Battery pack according to claim 6, wherein a first gap (610) is provided between the first safety valve (251) and the separating plate (141), wherein a second gap (620) is provided between each battery cell and the inner wall of the housing body (140), wherein both sides of the separating plate (141) are arranged at a distance from the inner wall of the housing body (140), so that the first gap (610) communicates with the second gap (620) and forms a vent channel, wherein a fifth safety valve (142) is arranged on the housing body (140) and the vent channel is connected to the fifth safety valve (142). [8] Battery pack according to claim 5, wherein the axes of the battery cells arranged on both sides of the separating plate (141) are not aligned parallel to each other. [9] Electrical device comprising a battery pack according to any one of claims 1 to 8.

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