Battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery pack. The battery pack comprises a box body and a battery pack, the battery pack is located in the box body, the box body comprises a bottom plate and an enclosure frame, the enclosure frame is connected with the bottom plate, the battery pack comprises a plurality of arrayed battery monomers, anti-explosion valves are arranged on the surfaces, facing the bottom plate, of the battery monomers, first channels corresponding to the anti-explosion valves are formed in the bottom plate, and first blocking pieces are arranged on the bottom plate in the arraying direction of the battery monomers; the first blocking pieces are located on the two sides of the anti-explosion valve, second blocking pieces are arranged at the two ends of the anti-explosion valve in the direction perpendicular to the arrangement direction of the battery monomers, and gaps are formed between the first blocking pieces and the second blocking pieces to form second channels. When the battery monomers are in thermal runaway and after the anti-explosion valves of the battery monomers are exploded, high-temperature eruptions are sprayed outwards through the first channels of the bottom plate, and when the eruption amount is large, redundant gas at the bottoms of the battery monomers is discharged towards other directions through the second channels, so that the redundant high-temperature eruptions are prevented from influencing the safety of the two adjacent battery monomers.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery pack. Background Technology

[0002] In related technologies, the explosion-proof valve of the battery cell is set towards the bottom plate. After the battery cell in the battery pack experiences thermal runaway, high-temperature ejected material is ejected from the explosion-proof valve. The high-temperature ejected material is discharged from the battery pack through the exhaust channel set on the bottom plate. However, when the ejected amount of the battery cell is large, the high-temperature ejected material will accumulate on the bottom surface of the battery cell, affecting the safety of other battery cells.

[0003] Therefore, there is an urgent need for a battery pack to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a battery pack that can guide high-temperature ejected material to facilitate its discharge and prevent it from accumulating on the bottom surface of the battery cells.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery pack includes a housing and a battery assembly, the battery assembly being located within the housing. The housing includes a base plate and a frame, the frame being connected to the base plate. The battery assembly includes multiple arranged battery cells. Each battery cell has an explosion-proof valve on its surface facing the base plate. The base plate has a first channel corresponding to the explosion-proof valve. The base plate has a first blocking member along the arrangement direction of the battery cells, the first blocking member being located on both sides of the explosion-proof valve, perpendicular to the arrangement direction of the battery cells. Second blocking members are provided at both ends of the explosion-proof valve. A gap is provided between the first blocking member and the second blocking member to form a second channel.

[0007] This utility model has at least the following beneficial effects:

[0008] The battery pack provided by this utility model, when a battery cell experiences thermal runaway, the explosion-proof valve of the battery cell bursts, and high-temperature ejected material is ejected outward through the first channel of the bottom plate. When the ejection volume is large, excess gas at the bottom of the battery cell is discharged in other directions through the second channel between the first and second blocking members. Therefore, the cooperation of the first and second channels can improve the discharge efficiency of high-temperature ejected material and prevent excess high-temperature ejected material at the bottom of the battery cell from affecting the safety of two adjacent battery cells. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0010] Figure 1 A top view of the battery pack provided in an embodiment of this utility model;

[0011] Figure 2 A schematic diagram showing the positional relationship between the battery, the first blocking member, the blocking plate, and the base plate provided in an embodiment of this utility model;

[0012] Figure 3 A side view of the battery pack provided in an embodiment of this utility model.

[0013] In the picture:

[0014] 1. Box body; 11. Base plate; 111. First channel; 12. Enclosure frame; 13. Central beam; 2. Battery pack; 21. Battery cell; 211. Explosion-proof valve; 3. First blocking component; 4. Second blocking component; 5. Blocking plate; 6. Barrier component. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0016] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0018] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0019] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two).

[0020] like Figure 1 and Figure 3 As shown, this embodiment provides a battery pack, which includes a housing 1 and a battery group 2. The battery group 2 includes multiple arranged battery cells 21, and the number of battery groups 2 can be multiple. Each battery cell 21 has an explosion-proof valve 211. When the battery cell 21 experiences thermal runaway, the explosion-proof valve 211 will be opened by a high-temperature ejection to release the high-temperature ejection inside the battery cell 21. The housing 1 includes a base plate 11 and a frame 12, which are connected. The battery group 2 is housed inside the housing 1. The explosion-proof valve 211 is provided on the surface of the battery cell 21 facing the base plate 11. The base plate 11 is provided with a first channel 111 corresponding to the explosion-proof valve 211. The base plate 11 is provided with a first blocking member 3 along the arrangement direction of the battery cells 21. The first blocking member 3 is located on both sides of the explosion-proof valve 211. Along the direction perpendicular to the arrangement direction of the battery cells 21, the two ends of the explosion-proof valve 211 are provided with second blocking members 4. A gap is provided between the first blocking member 3 and the second blocking member 4 to form a second channel.

[0021] In the battery pack provided in this embodiment, when a battery cell 21 experiences thermal runaway, the explosion-proof valve 211 of the battery cell 21 bursts, and high-temperature ejected material is ejected outward through the first channel 111 of the base plate 11. When the ejection volume is large, excess gas at the bottom of the battery cell 21 is discharged in other directions through the second channel between the first blocking member 3 and the second blocking member 4. Therefore, the cooperation between the first channel 111 and the second channel can improve the discharge efficiency of high-temperature ejected material (especially high-temperature gas) and prevent excess high-temperature ejected material at the bottom of the battery cell 21 from affecting the safety of two adjacent battery cells 21.

[0022] In some embodiments, along the length of the second blocking member 4, gaps are formed between both ends of the second blocking member 4 and the frame 12 to form a third channel. That is, the two ends of the second blocking member 4 are not in contact with the frame 12, and the gap between the second blocking member 4 and the frame 12 forms the third channel. With this configuration, when thermally runaway high-temperature ejected material is discharged outward through the second channel, it can also be discharged through the third channel, away from the battery pack 2, thus preventing the thermally runaway battery cells 21 from affecting the battery cells 21 that have not experienced thermal runaway.

[0023] In some embodiments, the length of the first blocking member 3 is greater than the length of the explosion-proof valve 211. When the battery cell 21 experiences thermal runaway, since the length of the explosion-proof valve 211 of the battery cell 21 is shorter than the length of the first blocking member 3, the first blocking member 3 can block the explosion-proof valves 211 of adjacent battery cells 21, thus better preventing the high-temperature ejected material from the explosion-proof valve 211 from affecting adjacent battery cells 21.

[0024] In some embodiments, such as Figure 2 As shown, the bottom surfaces of two adjacent battery cells 21 respectively cover at least one-quarter of the width of the first blocking member 3. Two adjacent battery cells 21 simultaneously press against the same first blocking member 3, so that one blocking member can simultaneously block two battery cells 21, thereby reducing the arrangement of the first blocking member 3 and saving the manufacturing cost of the battery pack.

[0025] In some embodiments, combined with Figures 1 to 3 As shown, the battery pack also includes a baffle plate 5, which is located on the side of the base plate 11 facing the explosion-proof valve 211 to cover the first channel 111. The baffle plate 5 can be opened in the event of thermal runaway of the battery cell 21. The first blocking member 3 is located between the baffle plate 5 and the battery cell 21. When the battery cell 21 experiences thermal runaway, the baffle plate 5 corresponding to the explosion-proof valve 211 of the thermally runaway battery cell 21 is opened by the high-temperature ejected material, which is used to transmit the high-temperature ejected material to the first channel 111. The first channels 111 at other locations on the base plate 11 are closed by the baffle plate 5 to prevent the ejected high-temperature ejected material from affecting the explosion-proof valves 211 of other battery cells 21 through other first channels 111.

[0026] For example, the baffle plate 5 is a mica plate, and the thickness of the mica plate ranges from 0.1mm to 0.3mm. For example, the thickness of the mica plate can be 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm or 0.3mm. No specific limitation is made in this embodiment. When the thickness of the mica plate is selected as 0.1mm, the high-temperature ejected material can be guided to the first channel 111 in time after the explosion-proof valve 211 is opened by explosion; when the thickness of the mica plate is 0.2mm, the high-temperature ejected material can be exploded by the high-temperature ejected material after a certain amount has accumulated. In addition, it can also prevent the position of the explosion-proof valve 211 of the baffle plate 5 corresponding to other battery cells 21 from being exploded; when the thickness of the mica plate is 0.3mm, it can prevent the position of the explosion-proof valve 211 of the baffle plate 5 corresponding to other battery cells 21 from being exploded.

[0027] In some other embodiments, the baffle plate 5 is a mica plate with a thickness greater than 0.3 mm. The mica plate is thinned at the positions corresponding to the explosion-proof valve 211 and the first channel 111. For example, the mica plate can be provided with a thinning groove to achieve the thinning of the mica plate at the position corresponding to the explosion-proof valve 211.

[0028] The thickness of the first blocking member 3 ranges from 0.3mm to 1mm. The first blocking member 3 can be a silicone rubber pad, and its thickness can be selected as 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm. No specific limitation is made in this embodiment. When the thickness of the first blocking member 3 is 0.3mm, it can provide an opening space for the explosion-proof valve 211 to explode. When the thickness of the first blocking member 3 is 0.6mm, it can not only provide an opening space for the explosion-proof valve 211 to explode, but also form a certain space between the battery cell 21 and the blocking plate 5. This space can concentrate the high-temperature ejected material and increase the pressure in the space to ensure that the high-temperature ejected material will explode the blocking plate 5.

[0029] In some embodiments, the thickness of the second blocking member 4 ranges from 0.5mm to 3mm. Specifically, the thickness of the second blocking member 4 can be selected as 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm. No specific limitation is made in this embodiment. When the thickness of the second blocking member 4 is 0.5mm, it provides space for the discharge of high-temperature ejected material, reducing the overall height of the battery pack. When the thickness of the second blocking member 4 is 1.5mm, it not only provides a greater space for the discharge of high-temperature ejected material but also ensures the height of the second channel, preventing blockage and avoiding increasing the height of the battery pack. When the thickness of the second blocking member 4 is 3mm, it provides space for the discharge of high-temperature ejected material while also preventing blockage of the second channel. It should be noted that the thickness of the second blocking member 4 refers to the compacted thickness of the second blocking member 4 after the battery pack assembly is completed.

[0030] In some embodiments, to facilitate the assembly of the battery pack, the baffle plate 5 and the first baffle 3 are integrated. This improves the installation efficiency of the battery pack and also prevents the first baffle 3 from shifting relative to the baffle plate 5 during the installation of the battery pack 2, thus avoiding obstruction of the explosion-proof valve 211 of the battery cell 21 and ensuring that the explosion-proof valve 211 can be opened smoothly.

[0031] In some embodiments, the battery pack further includes an adhesive layer disposed on the base plate 11 on the side of the second barrier 4 away from the explosion-proof valve 211. The adhesive layer is used to bond the battery cell 21 to the base plate 11. The adhesive layer is formed by the solidification of liquid adhesive, and the second barrier 4 can prevent structural adhesive from overflowing to the explosion-proof valve 211 of the battery cell 21 during pressing.

[0032] In some embodiments, the gap length between the first blocking member 3 and the second blocking member 4 ranges from 0.5mm to 3mm. For example, the gap length between the first blocking member 3 and the second blocking member 4 can be selected as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, and is not specifically limited in this embodiment. When the gap length between the first blocking member 3 and the second blocking member 4 is 0.5mm, a second channel can be formed to provide a guiding channel for the high-temperature ejected material, increasing the flow path of the high-temperature ejected material and facilitating its rapid removal. When the gap length between the first blocking member 3 and the second blocking member 4 is 3mm, the width of the second channel can be increased, and the probability of the second channel being blocked can be reduced.

[0033] Of course, in some embodiments, the distance between the end face of the second blocking member 4 and the side wall of the adjacent frame 12 ranges from 1mm to 10mm. For example, the shortest distance between the end face of the second blocking member 4 and the side wall of the frame 12 is 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, and is not specifically limited in this embodiment. When the shortest distance between the end face of the second blocking member 4 and the side wall of the frame 12 is 1mm, the width of the third channel can be guaranteed to ensure that the high-temperature ejected material is discharged from the third channel and away from the battery pack 2; when the shortest distance between the end face of the second blocking member 4 and the side wall of the frame 12 is 10mm, the width of the third channel can be guaranteed to prevent it from being blocked by the high-temperature ejected material, so as to ensure that the high-temperature ejected material is discharged from the third channel and away from the battery pack 2.

[0034] In some embodiments, such as Figure 2 As shown, a barrier 6 is provided between adjacent battery cells 21. The barrier 6 can block the high-temperature ejected material in the second channel, preventing the high-temperature ejected material from entering between the two battery cells 21 through the gap between adjacent battery cells 21, thereby improving the overall safety of the battery pack.

[0035] Specifically, such as Figure 1 and Figure 2 As shown, the frame 12 is ring-shaped, and the base plate 11 is connected to the frame 12. The base plate 11 and the frame 12 enclose a receiving space to accommodate the battery pack 2. The housing 1 also includes a central beam 13, which is connected to the frame 12 at both ends in the length direction to separate the receiving space. The central beam 13 and the base plate 11 are fixedly connected by riveting connectors and are set perpendicular to the base plate 11 to adapt to the external contour of the battery pack 2.

[0036] In some embodiments, the battery cell 21 can be a secondary battery, which refers to a battery cell 21 that can be recharged after discharge to activate the active materials and continue to be used. The battery cell 21 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0037] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A battery pack, characterized by, The device includes a housing (1) and a battery pack (2). The battery pack (2) is located inside the housing (1). The housing (1) includes a base plate (11) and a frame (12). The frame (12) is connected to the base plate (11). The battery pack (2) includes a plurality of battery cells (21) arranged in a row. An explosion-proof valve (211) is provided on the surface of the battery cell (21) facing the base plate (11). The base plate (11) is provided with a first channel (111) corresponding to the explosion-proof valve (211). The base plate (11) is provided with a first blocking member (3) along the arrangement direction of the battery cells (21). The first blocking member (3) is located on both sides of the explosion-proof valve (211) along the arrangement direction perpendicular to the battery cells (21). Second blocking members (4) are provided at both ends of the explosion-proof valve (211). A gap is provided between the first blocking member (3) and the second blocking member (4) to form a second channel.

2. The battery pack of claim 1, wherein, Along the length of the second blocking member (4), gaps are provided between the two ends of the second blocking member (4) and the frame (12) to form a third channel.

3. The battery pack of claim 1 or 2, wherein, The length of the first blocking member (3) is greater than the length of the explosion-proof valve (211).

4. The battery pack of claim 1 or 2, wherein, The bottom surfaces of two adjacent battery cells (21) respectively cover at least a quarter of the width of the same first blocking member (3).

5. The battery pack of claim 1 or 2, wherein, The battery pack also includes a baffle plate (5) located on one side of the base plate (11) facing the explosion-proof valve (211) to cover the first channel (111). The first blocking member (3) is located between the baffle plate (5) and the battery cell (21). The baffle plate (5) can be opened in the event of thermal runaway of the battery cell (21).

6. The battery pack of claim 5, wherein, The blocking plate (5) and the first blocking member (3) are an integral structure.

7. The battery pack of claim 1 or 2, wherein, The battery pack also includes an adhesive layer disposed on the base plate (11) of the second blocking member (4) on the side away from the explosion-proof valve (211).

8. The battery pack of claim 1 or 2, wherein, The thickness of the second blocking member (4) ranges from 0.5 mm to 3 mm.

9. The battery pack of claim 1 or 2, wherein, The gap length between the first blocking member (3) and the second blocking member (4) ranges from 0.5mm to 3mm; Alternatively, the shortest distance between the end face of the second blocking member (4) and the side wall of the frame (12) is between 1mm and 10mm.

10. The battery pack of claim 1 or 2, wherein, A barrier (6) is provided between adjacent battery cells (21).

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