Battery pack with side-lying battery cells

Abstract

The utility model discloses a battery pack with side-lying battery cells, which relates to the related technical field of battery packs and comprises a battery supporting plate pack, an accommodating cavity with an upward opening is arranged in the battery supporting plate pack, a module is arranged in the accommodating cavity, a plurality of horizontally arranged battery cells are arranged in the module, and the battery cells are arranged in the accommodating cavity. The side wall of the module is provided with a plurality of explosion-proof holes corresponding to the plurality of battery cells, the side wall of the battery supporting plate bag is internally provided with an out-of-control channel surrounding the accommodating cavity, a plurality of side wall windows are connected between the out-of-control channel and the accommodating cavity, and the positions of the side wall windows and the positions of the explosion-proof holes are in one-to-one correspondence; the battery cells are sequentially stacked in a side-lying mode, flames are jetted towards the two sides during thermal runaway, the influence of jetting of the thermal runaway battery cells on the peripheral battery cells is reduced, and the risk of thermal diffusion is reduced; meanwhile, thermal runaway channels are designed on the two sides of the tray to guide the thermal runaway flame trend of the battery cell, and an internal channel is connected with a battery pack explosion-proof valve, so that the battery pack explosion risk is reduced while the thermal runaway flame trend is guided.

Description

Technical Field

[0001] This utility model relates to the technical field of battery packs, and in particular to a battery pack with cells lying on their sides. Background Technology

[0002] Existing technical solutions use stamped trays or aluminum extrusion and welding trays. The cells are stacked sequentially with the terminals and cell explosion-proof valves facing upwards. In conventional square-shell cell battery packs, the cell terminals are generally oriented towards the top of the battery pack. The cells are arranged sequentially to form modules, and the modules are then connected in series and fixed to the tray. A cover is installed on the tray to form a battery pack. Alternatively, the module units can be eliminated, and the cell units are directly grouped, stacked sequentially and fixed to the tray, and a cover is installed to form a battery pack, which is the CTP (Cell-to-Pack) solution.

[0003] In order to improve module assembly efficiency, CTP (Cell-to-Pack) solutions generally adopt a configuration where the cell terminals and cell explosion-proof valves face upwards. When the battery pack experiences thermal runaway, the flames emitted by the cells spread from above. The battery pack cover is generally a single-layer structure with weak structural protection, making it easy to burn through and cause heat spread. At the same time, the cover does not have a flame guiding design, which can easily lead to the cover burning through, affecting the safety of the upper part of the battery pack. The covered cover may even guide the flames to spread from above to the surrounding areas, causing thermal runaway in other cells and further increasing the risk of thermal runaway. Utility Model Content

[0004] Purpose of the invention: The purpose of this utility model is to provide a battery pack with the battery cells lying on their sides, which solves the problem that it is difficult to handle in the event of an accident when both the battery cells and the explosion-proof valve are facing upwards.

[0005] Technical solution: A battery pack with cells lying on their side, comprising a battery tray, wherein the battery tray has an upward-opening accommodating cavity, the accommodating cavity contains a module, the module contains a plurality of horizontally placed cells, the side wall of the module has a plurality of explosion-proof holes corresponding to the plurality of cells, the side wall of the battery tray has a runaway channel circling the accommodating cavity, and a plurality of side wall openings are connected between the runaway channel and the accommodating cavity, the side wall openings and the explosion-proof holes being positioned one-to-one.

[0006] Preferably, an explosion-proof valve extending from the battery tray is connected to the runaway channel.

[0007] Preferably, there are two modules, and a heat dissipation structure is provided between the two modules.

[0008] Preferably, the heat dissipation structure includes thermally conductive adhesive, which abuts against the modules on both sides.

[0009] Preferably, the heat dissipation structure further includes a liquid cooling plate and a liquid cooling pipe, one end of which is connected to the liquid cooling plate, and the other end of which passes through the battery tray.

[0010] Preferably, the thermally conductive adhesive is used to wrap the liquid cooling plate.

[0011] The liquid cooling plate is covered with thermally conductive adhesive, which then connects the modules on both sides, increasing the contact area and ensuring heat dissipation.

[0012] Preferably, foam is fixedly installed at the bottom of the battery tray pack.

[0013] Beneficial effects: The battery cells are stacked sequentially in a side-lying manner. In the event of thermal runaway, the flames are sprayed to both sides, reducing the impact of the thermal runaway cell's flames on surrounding cells and minimizing the risk of heat spread. At the same time, thermal runaway channels are designed on both sides of the tray to guide the direction of the thermal runaway flames. These channels are connected to the battery pack's explosion-proof valve through internal channels, which reduces the risk of battery pack explosion while guiding the direction of the thermal runaway flames. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the explosive unfolding structure of this utility model;

[0016] Figure 3 This is a top view of the cross-sectional structure of the module of this utility model;

[0017] Figure 4 This is a schematic diagram of the module structure of this utility model;

[0018] Figure 5 This is a top view of the battery tray pack of this utility model.

[0019] Reference numerals: 11. Battery tray; 112. Foam; 113. Side wall window; 114. Runaway channel; 115. Explosion-proof valve; 12. Battery pack cover; 13. Separator; 14. Module; 141. Battery cell; 142. Explosion-proof hole; 15. Thermally conductive structure; 151. Thermally conductive adhesive; 152. Liquid cooling pipe; 153. Liquid cooling plate; 16. Receptacle; 17. Battery element. Detailed Implementation

[0020] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] like Figure 1 and Figure 5As shown, a battery pack with cells lying on their side includes a battery tray 11, which is the outer shell of the battery pack.

[0023] The battery tray package 11 has an upward-opening receiving cavity 16, and the receiving cavity 16 contains a module 14.

[0024] The module 14 is composed of battery cells 141. In this application, the battery cells 141 are stacked sideways to form the module 14. The number of battery cells 141 is adjusted according to actual usage requirements. At the same time, the size of the battery tray 11 also changes with the number of battery cells 141, which facilitates control of the battery pack volume ratio and reduces idle space.

[0025] The module 14 is fixed to the bottom wall of the accommodating cavity 16 by bolts. At the same time, the bottom of the battery tray 11 is also provided with foam 112. When the module 14 is fixed, the foam 112 and the bottom of the module 14 abut against each other, which plays a role in heat insulation protection.

[0026] like Figure 2 As shown, a partition 13 is provided above the module 14. The partition 13 is made of foam 112, which also serves as heat insulation and protection. A battery pack cover 12 is also provided above the partition 13. The battery pack cover 12 is fixed to the battery tray 11 by upper bolts, thereby forming a sealed space to wrap the module 14 inside and provide protection.

[0027] like Figure 3 and Figure 4 As shown in this application, the module 14 is provided in two sets, which are set in pairs. To ensure battery safety, the pole direction of the cell 141 faces the inner wall of the accommodating cavity 16 on both sides to prevent the two sets of modules 14 from igniting each other. The stacked cells in the middle are fixed between the end plates on both sides by welding the pull plate. The cells are laid on their sides and the cell explosion-proof valve faces the side of the module.

[0028] Furthermore, the inner wall of the battery tray pack 11 is provided with an out-of-control channel 114. The out-of-control channel 114 is a tubular inner cavity and is arranged around the accommodating cavity 16. A side wall opening 113 connects the out-of-control channel 114 and the accommodating cavity 16. The side wall opening 113 faces the battery cell 141. At the same time, the module 14 is also provided with an explosion-proof hole 142, which corresponds to the terminal position of the battery cell 141. In addition, the explosion-proof hole 142 and the side wall opening 113 correspond one-to-one. When the battery has an accident, the thermal runaway direction of the battery cell can be guided to enter the out-of-control channel 114 through the explosion-proof hole 142 and the side wall opening 113, which is less likely to affect the top of the battery pack of the vehicle body and less likely to spread.

[0029] When cell 141 goes out of control, the flames produced by cell 141 will enter the out-of-control channel 114. When there are many out-of-control cells, the air pressure in the out-of-control channel 114 will increase. Therefore, an explosion-proof valve 115 is connected in the out-of-control channel 114. The explosion-proof valve 115 is located on the other side wall of the battery tray 11 to prevent the out-of-control flames from directly impacting the explosion-proof valve 115, causing premature discharge and causing more accidents.

[0030] The two modules 14 tend to generate a lot of heat during charging and discharging. To ensure the normal operation of the modules 14, corresponding heat dissipation structures are provided at the two modules 14. A gap is left between the two modules 14, and a liquid cooling plate 153 is provided at the gap of the heat dissipation structure. Thermal conductive adhesive 151 is wrapped on the liquid cooling plate 153. The thermal conductive adhesive 151 covers the liquid cooling plate 153. At the same time, the liquid cooling plate 153 is in full contact with the modules 14 on both sides through the thermal conductive adhesive 151, thereby ensuring the heat dissipation effect of the modules.

[0031] Furthermore, such as Figure 3 As shown, the liquid cooling plate 153 is also connected to a liquid cooling pipe 152. The liquid cooling pipe 152 extends outward, with one end connected to the liquid cooling plate 153 and the other end fixedly connected to the side wall of the accommodating cavity 16. The side wall of the accommodating cavity 16 is connected to an upper and lower water pipe, which passes through the battery tray 11 and connects to the external pipeline. At the same time, the inner side of the upper and lower water pipes is connected to the liquid cooling pipe 152, which facilitates the control of the liquid cooling plate 153 to dissipate heat.

[0032] Meanwhile, the side wall of the battery tray 11 is also provided with several mounting holes for mounting various battery components 17. The battery components 17 may include various sensors and control components to facilitate monitoring of the battery module status.

[0033] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An electrically laterally lying battery pack, characterized in that: The battery tray bag (11) is provided with an upward opening containing cavity (16), the containing cavity (16) is provided with a module (14), the module (14) is provided with a plurality of horizontally placed battery cells (141), the sidewall of the module (14) is provided with a plurality of explosion-proof holes (142) corresponding to the battery cells (141), the sidewall of the battery tray bag (11) is provided with a runaway channel (114) surrounding the containing cavity (16), the runaway channel (114) and the containing cavity (16) are connected with a plurality of sidewall windows (113), the sidewall windows (113) and the explosion-proof holes (142) are one-to-one corresponding.

2. The electric side-lying battery pack of claim 1, wherein: The runaway channel (114) is connected with an explosion-proof valve (115) extending out of the battery tray bag (11).

3. The battery pack of claim 1, wherein: The module (14) is provided with two, and the two modules (14) are provided with a heat dissipation structure.

4. The electric side-lying battery pack of claim 3, wherein: The heat dissipation structure includes a heat-conducting adhesive (151), and the heat-conducting adhesive (151) abuts against the two modules (14).

5. The electric side-lying battery pack of claim 4, wherein: The heat dissipation structure further includes a liquid cooling plate (153) and a liquid cooling pipe (152), one end of the liquid cooling pipe (152) is connected with the liquid cooling plate (153), and the other end of the liquid cooling pipe (152) penetrates through the battery tray bag (11).

6. The electric side-lying battery pack of claim 5, wherein: The heat-conducting adhesive (151) wraps the liquid cooling plate (153).

7. The electric side-lying battery pack of claim 1, wherein: The bottom of the battery tray bag (11) is fixedly provided with a foam (112).

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