Battery pack

Abstract

The utility model discloses a battery pack, which comprises a die-casting shell, a battery pack, a battery pack, a battery cover and a battery pack, the die-casting shell is provided with accommodating cavities, the accommodating cavities comprise a battery cell accommodating cavity and a BMS (battery management system) accommodating cavity, the battery cell accommodating cavity is provided with a battery cell opening, and the BMS accommodating cavity is provided with a BMS opening; the battery cover body is in sealed connection with the battery cell opening; the BMS cover body is in sealed connection with the BMS opening; the battery module is assembled in the battery cell accommodating cavity, the battery module comprises at least two battery cells, and the battery cells are stacked along the opening direction of the battery cells; and the BMS is assembled in the BMS accommodating cavity and is electrically connected with the battery module. According to the utility model, the die-casting shell is adopted, the strength of the battery pack for starting is improved, so that the extrusion working condition requirement is met, meanwhile, the internal battery cells are horizontally stacked, better weight distribution can be realized, the stability and the balance of the whole battery pack are favorably improved, and the CB controllability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of starting batteries, in particular to a battery pack. Background Art

[0002] In the prior art, in order to achieve a lightweight design, the battery pack will design the outer shell or cover to be made of plastic or plastic material. This structure is prone to deformation, rupture and other problems under extrusion conditions, and cannot meet the safety requirements of the vehicle under extreme conditions such as collision and extrusion. After the battery pack is squeezed, the CB (controlled drop) controllability of the battery pack is poor, which can easily lead to safety problems such as internal short circuit and fire in the battery pack. Utility Model Content

[0003] In order to overcome at least one defect of the above-mentioned prior art, the utility model provides a battery pack. By adopting a die-cast shell, the inherent strength of the starting battery pack is improved, thereby meeting the requirements of the extrusion working condition. At the same time, the internal battery cells are stacked in a horizontal direction, which can achieve a better weight distribution and help improve the stability and balance of the entire battery pack. In this way, the structural problems caused by the imbalance of weight during the use of the battery pack can be reduced, and the controllability of the CB can be improved.

[0004] The utility model adopts the following technical scheme to solve the problem: a battery pack, comprising: a die-cast shell, the die-cast shell having a accommodating cavity, the accommodating cavity comprising a battery cell accommodating cavity and a BMS accommodating cavity, a battery cell opening is arranged on a side of the battery cell accommodating cavity away from the BMS accommodating cavity, and a BMS opening is arranged on a side of the BMS accommodating cavity away from the battery cell accommodating cavity; a battery cover, the battery cover is sealed and connected to the battery cell opening; a BMS cover, the BMS cover is sealed and connected to the BMS opening; a battery module, the battery module is assembled in the battery cell accommodating cavity, the battery module comprises at least two battery cells, and the battery cells are stacked along the direction of the battery cell opening; a BMS, the BMS is assembled in the BMS accommodating cavity and is electrically connected to the battery module.

[0005] By adopting the above scheme, the die-cast shell can be divided into two layers, the upper and lower layers, which are respectively equipped with the battery module and the BMS. At the same time, the battery cells in the battery module are stacked along the direction of the battery cell opening to form a horizontal arrangement. Compared with the horizontally stacked battery modules, the balance and stability of the battery module are improved, so that the battery module in the die-cast shell is safer and has stronger shear resistance.

[0006] Furthermore, a partition plate is provided between the battery cell accommodating cavity and the BMS accommodating cavity, and a wiring hole is provided on the partition plate.

[0007] By adopting the above solution, the battery module and BMS can be separated through the battery cell accommodating cavity and the BMS accommodating cavity, which can reduce the complexity of electrical connection and reduce the probability of failure. At the same time, the layered design can also provide better protection and reduce the impact of the external environment on the BMS and module, thereby improving the controllability of the CB.

[0008] Furthermore, the battery module includes: a cell group, which is formed by stacking cell groups; a first shell, which is sleeved on one end of the cell group; and a second shell, which is sleeved on the other end of the cell group; wherein a filler is provided in the gap between the first shell and the second shell, and the filler is against the cell group.

[0009] By adopting the above solution, the first shell and the second shell wrap and fix the stacked battery cells, and the filling member can improve the pressure resistance of the battery cell group and reduce the impact, vibration or pressure on the battery cell group. At the same time, the foam also has insulation and heat dissipation effects, and can position and fix the battery cells to provide better mechanical support, thereby improving the controllability of the CB.

[0010] Furthermore, a limiting member is provided between the battery module and the battery cell accommodating cavity, and the limiting member is respectively against the battery module and the battery cell accommodating cavity.

[0011] By adopting the above solution, the limiting member can limit the position of the battery module in the battery cell accommodating cavity, thereby achieving a fixing effect.

[0012] Furthermore, a plurality of convex ribs are provided on the outer surface of the first shell and / or the second shell, and at least part of the convex ribs abut against the limiting member.

[0013] By adopting the above solution, the convex rib can increase the abutment strength between the first shell and / or the second shell and the limiting member, thereby improving the fixing effect.

[0014] Furthermore, a hole is provided on one side of the BMS accommodating cavity, a plug for plugging with the BMS is provided in the hole, and a dust plug is provided on the plug.

[0015] By adopting the above solution, the air tightness of the plug of the BMS accommodating cavity is improved, achieving a sealing and dustproof effect.

[0016] Furthermore, the side wall of the BMS accommodating cavity on which the hole is set is the first side wall, the side wall of the battery cell accommodating cavity corresponding to the first side wall is the second side wall, a step surface is provided between the first side wall and the second side wall, the width of the step surface is the distance from the first side wall to the second side wall, and the length of the dust plug after assembly with the plug is less than the width of the step surface.

[0017] By adopting the above solution, the impact of the die-cast housing on the plug when it is hit can be reduced, thereby improving the safety of the plug.

[0018] Furthermore, a first sealing layer is provided between the battery cover and the battery cell opening, and a second sealing layer is provided between the BMS cover and the BMS opening.

[0019] By adopting the above solution, the assembly air tightness between the battery cover, the BMS cover and the die-cast housing is improved.

[0020] Further, the battery cell opening is provided with a first clearance groove around the first sealing layer, and / or the BMS opening is provided with a second clearance groove around the second sealing layer.

[0021] By adopting the above scheme, by setting the first clearance groove and the second clearance groove, a better sealing effect can be provided for the first sealing layer and the second sealing layer, so that the surface fits more tightly, and the entry or leakage of substances such as gas, liquid or dust can be effectively prevented; at the same time, the first sealing layer and the second sealing layer can be provided with a fixing and positioning function to avoid movement or falling off during use, which helps to maintain the stability and durability of the seal.

[0022] Furthermore, the wiring holes of the partition plate are provided with insulating die-castings, the battery module is connected with a first positive electrode connecting plate and a first negative electrode connecting plate, the BMS is connected with a second positive electrode connecting plate and a second negative electrode connecting plate, the insulating die-casting includes a first die-casting hole and a second die-casting hole, the first die-casting hole is penetrated by a first connector, the second die-casting hole is provided with a second connector, the first connector conducts and fixes the first positive electrode connecting plate and the second positive electrode connecting plate, and the second connector conducts and fixes the first negative electrode connecting plate and the second negative electrode connecting plate.

[0023] By adopting the above scheme, the assembly stability between the BMS and the battery module can be improved by separation processing through the insulating die-casting, the first connecting member and the second connecting member can be insulated and protected, and the wiring safety is improved.

[0024] Furthermore, a plurality of weight-reducing grooves are die-cast on the outer surface of the die-cast shell.

[0025] By adopting the above solution, the weight of the die-cast shell can be reduced, the use of materials can be reduced, and at the same time, the stability and bearing capacity of the structure can be maintained; the weight-reducing groove can also provide a certain heat dissipation effect. Since the weight-reducing groove increases the surface area of ​​the die-cast shell, it helps to dissipate heat, thereby reducing the temperature of the battery pack and improving the performance and life of the battery.

[0026] Furthermore, at least one auxiliary fixing member is provided on the outer surface of the die-cast housing.

[0027] By adopting the above solution, the fixing effect of the die-cast shell can be improved to meet the overall mechanical reliability and safety of the battery pack.

[0028] Furthermore, the battery pack is a starting battery pack.

[0029] By adopting the above solution, the problem of deformation and rupture of the starting battery pack under extrusion conditions can be improved, while the self-strength and CB controllability can be improved.

[0030] In summary, the battery pack provided by the utility model has the following technical effects:

[0031] 1. Improve the balance and stability of the battery module: By stacking the battery cells in the battery module along the direction of the battery cell opening to form a horizontal arrangement, compared with the horizontally stacked battery modules, this design improves the balance and stability of the battery module, thereby making the battery module located in the die-cast shell safer and more resistant to shear.

[0032] 2. Meet the requirements of extrusion working conditions: Replacing the plastic shell with a die-cast shell improves the strength of the starting battery pack, thereby meeting the requirements of extrusion working conditions.

[0033] 3. Improve the stability and balance of the battery pack: The internal battery cells are stacked horizontally, which can achieve better weight distribution and help improve the stability and balance of the entire battery pack. This can reduce structural problems caused by weight imbalance during use of the battery pack and improve the controllability of the CB. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model;

[0035] Figure 2 This is a schematic diagram of a partial explosion structure of an embodiment of the utility model;

[0036] Figure 3 This is a schematic diagram of the back structure of the die-cast housing of an embodiment of the utility model;

[0037] Figure 4 This is a schematic diagram of the front structure of the die-cast housing of an embodiment of the utility model;

[0038] Figure 5 This is a schematic diagram of the assembly structure of the insulating die casting according to an embodiment of the utility model;

[0039] Figure 6 A schematic diagram of the battery module structure of an embodiment of the utility model;

[0040] Figure 7 This is a schematic diagram of the disassembled structure of the BMS cover body of an embodiment of the utility model.

[0041] The meanings of the reference numerals are as follows: 1. die-cast shell; 11. battery cell accommodating chamber; 111. battery cell opening; 112. second side wall; 113. stepped surface; 12. BMS accommodating chamber; 121. BMS opening; 122. first side wall; 123. plug; 124. dust plug; 13. partition plate; 131. wiring hole; 14. assembly part; 15. weight reduction groove; 2. battery cover; 3. battery module; 31. battery cell group; 311. battery cell; 3 ...4. first side wall; 125. second side wall; 126. second side wall; 127. second side wall; 128. second side wall; 129. second side wall; 130. second side wall; 131. second side wall; 132. first side wall; 133. first side wall; 134. first side wall; 135. first side wall; 136. first side wall; 137. first side wall; 138. first side wall; 139. first side wall; 140. first side wall; 141. first side wall; 142. first side wall; 143. first side wall; 144. first side wall; 145. first side wall; 146. first side wall; 147. first side wall; 148. first side wall; 149. first side wall; 150. first side wall; 151. first side wall; 152. A set of shells; 33, a second set of shells; 34, a filling piece; 35, a limiting piece; 36, a convex rib; 37, a first positive electrode connecting piece; 38, a first negative electrode connecting piece; 4, a BMS; 41, a second positive electrode connecting piece; 42, a second negative electrode connecting piece; 5, a BMS cover; 6, an insulating die-casting; 61, a first die-casting hole; 62, a first die-casting hole; 7, a first sealing layer; 71, a first clearance groove; 8, a second sealing layer; 81, a second clearance groove; 9, an auxiliary fixing piece. DETAILED DESCRIPTION

[0042] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] In order to facilitate the understanding of the embodiments of the present utility model, the following will be further explained by taking specific embodiments as examples in conjunction with the drawings, and each embodiment does not constitute a limitation on the embodiments of the present utility model.

[0044] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0046] See also Figure 1-Figure 7As shown, the utility model discloses a battery pack, including a die-cast shell 1, a battery cover 2, a BMS cover 5, a battery module 3 and a BMS 4. In one embodiment, the die-cast shell 1 has a accommodating cavity, and the accommodating cavity includes a battery cell accommodating cavity 11 and a BMS accommodating cavity 12. A battery cell opening 111 is provided on a side of the battery cell accommodating cavity 11 away from the BMS accommodating cavity 12, and a BMS opening 121 is provided on a side of the BMS accommodating cavity 12 away from the battery cell accommodating cavity 11, so that the battery cell opening 111 and the BMS opening 121 are arranged in back-to-back orientation, and the battery cover 2 is connected to the BMS cover 5. The battery cell opening 111 is sealed and connected, and the BMS cover 5 is sealed and connected to the BMS opening 121; the BMS cover 5 and the battery cover 2 are made of high-ductility sheet metal, have high strength and hardness, and can withstand large loads and impact forces, thereby improving the reliability and safety of the battery pack; the battery module 3 is assembled in the battery cell accommodating cavity 11, and the battery module 3 includes at least two battery cells 311, and the battery cells 311 are stacked along the direction of the battery cell opening 111; the BMS 4 is assembled in the BMS accommodating cavity 12 and is electrically connected to the battery module 3. It is assumed that the battery cover 2 is assembled on the top surface of the die-cast shell 1, and the BMS cover 5 is assembled on the bottom surface of the die-cast shell 1, so the die-cast shell 1 can be divided into an upper and lower layer, which are respectively equipped with a battery module 3 and a BMS 4. At the same time, the battery cells 311 in the battery module 3 are stacked along the direction of the battery cell opening 111, that is, stacked longitudinally to form a horizontal arrangement. Compared with the horizontally stacked battery modules 3, the balance and stability of the battery module 3 are improved, so that the battery module 3 located in the die-cast shell 1 is safer and has stronger shear resistance.

[0047] In some embodiments, see Figure 3-4 As shown, in order to improve the relative independence between BMS4 and battery module 3, a partition plate 13 is provided between the battery cell accommodating cavity 11 and the BMS accommodating cavity 12, and a wiring hole 131 is provided on the partition plate 13, and the battery module 3 and BMS4 can be separated through the battery cell accommodating cavity 11 and the BMS accommodating cavity 12, which can reduce the complexity of electrical connection and reduce the probability of failure. At the same time, the layered design can also provide better protection and reduce the impact of the external environment on BMS4 and the module, thereby improving the controllability of CB.

[0048] In some embodiments, see Figure 3-5As shown, in order to reserve a certain assembly space between the BMS4 and the battery module 3, one side of the die-cast shell 1 is protruded outward to form an assembly portion 14, the battery cell accommodating cavity 11, the BMS accommodating cavity 12 and the partition plate 13 all extend toward the assembly portion 14, the wiring hole 131 is arranged on the partition plate 13 in the assembly portion 14, and the wiring hole 131 of the partition plate 13 is provided with an insulating die-casting 6, the battery module 3 is connected with a first positive electrode connecting piece 37 and a first negative electrode connecting piece 38, the BMS4 is connected with a second positive electrode connecting piece 41 and a second negative electrode connecting piece 42, The insulating die-casting 6 includes a first die-casting hole 61 and a second die-casting hole, the first die-casting hole 61 is penetrated by a first connector, the second die-casting hole is provided with a second connector, the first connector conducts and fixes the first positive electrode connector 37 and the second positive electrode connector 41, the second connector conducts and fixes the first negative electrode connector 38 and the second negative electrode connector 42, and can be separated by the insulating die-casting 6, thereby improving the assembly stability between the BMS4 and the battery module 3, and the first connector and the second connector can be insulated and protected, thereby improving the wiring safety.

[0049] See also Figure 5-6As shown, the battery module 3 is usually wrapped by a battery cell group 31 and a plastic shell. In order to improve the safety of the battery module 3, in some embodiments, the battery module 3 includes a battery cell group 31, a first shell 32 and a second shell 33. The first shell 32 and the second shell 33 are both made of plastic. The battery cell group 31 is stacked by battery cells 311. The first shell 32 is sleeved on one end of the battery cell group 31, and the second shell 33 is sleeved on the other end of the battery cell group 31. A filler 34 is provided in the gap between the first shell 32 and the second shell 33, and the filler 34 is against the battery cell group 31. The filler 34 includes but is not limited to foam or structural adhesive. Specifically, in one embodiment, the filler 34 can be arranged between the battery cell group 31 and the bottom surface of the battery cell accommodating cavity 11, can also be arranged between the battery cell group 31 and the side of the battery cell accommodating cavity 11, can also be arranged between the battery cell group 31 and the battery cover 2, and the size of the filler 34 is not specifically limited, and the battery cell group 31 between the first shell 32 and the second shell 33 can be completely wrapped, or partially wrapped. Similarly, multiple fillers 34 can also be designed as one body to simplify the installation process. It should be noted that in order to ensure the filling effect of the filler 34, the thickness of the filler 34 needs to be not less than the thickness of the first shell 32 and the second shell 33. The stacked battery cells 311 are wrapped and fixed by the first shell 32 and the second shell 33, and the pressure resistance of the battery cell group 31 can be improved by cooperating with the filler 34, and the impact, vibration or pressure on the battery cell group 31 can be reduced. At the same time, the foam also has an insulation and heat dissipation effect, and can position and fix the battery cell 311 to provide better mechanical support, thereby improving the controllability of the CB.

[0050] In some embodiments, see Figure 2 and Figure 5 As shown, a limiting member 35 is provided between the battery module 3 and the battery cell accommodating cavity 11, and the limiting member 35 is respectively against the battery module 3 and the battery cell accommodating cavity 11, and the limiting member 35 can limit the position of the battery module 3 in the battery cell accommodating cavity 11, thereby achieving a fixing effect. In one embodiment, the limiting member 35 includes but is not limited to foam, structural glue or high elastic glue, and is used to fix the battery module 3 to at least three surfaces of the battery cell accommodating cavity 11, specifically the three surfaces away from the assembly portion 14. Since the first shell 32, the second shell 33 and the filling member 34 of the battery module 3 are all made of flexible materials, the battery module 3 can be integrally inserted into the battery cell accommodating cavity 11 in cooperation with the flexible limiting member 35, thereby achieving a fixing effect on the battery module 3.

[0051] In order to further improve the clamping stability between the limiting member 35 and the battery module 3, optionally, refer to Figure 6As shown, a plurality of convex ribs 36 are provided on the outer surface of the first shell 32 and / or the second shell 33, and at least part of the convex ribs 36 abut against the limiting member 35. The arrangement direction of the convex ribs 36 can be horizontal or vertical, or can be staggered horizontally and vertically, which can increase the friction between the battery module 3 and the limiting member 35, thereby increasing the abutment strength between the first shell 32 and / or the second shell 33 and the limiting member 35 and improving the fixing effect.

[0052] In one embodiment, see Figure 3 , Figure 7 As shown, the side wall of the BMS accommodating chamber 12 away from the assembly portion 14 is the first side wall 122, and the first side wall 122 is provided with a hole, and the plug 123 plugged with the BMS4 is provided in the hole, and a sealing ring is provided between the plug 123 and the hole to ensure the sealing effect, and a dust plug 124 is provided on the plug 123, which can improve the air tightness of the plug 123 of the BMS accommodating chamber 12 and play a sealing and dustproof effect. The side wall of the battery cell accommodating chamber 11 corresponding to the first side wall 122 is the second side wall 112, and a step surface 113 is provided between the first side wall 122 and the second side wall 112, and the width of the step surface 113 is the distance from the first side wall 122 to the second side wall 112. The length of the dust plug 124 after assembly with the plug 123 is less than the width of the step surface 113, which can reduce the impact of the die-cast housing 1 on the plug 123 when it is hit, and improve the safety of the plug 123.

[0053] In one embodiment, see Figure 2 and Figure 7As shown, a first sealing layer 7 is arranged between the battery cover 2 and the battery cell opening 111, and a second sealing layer 8 is arranged between the BMS cover 5 and the BMS opening 121, which can improve the assembly air tightness between the battery cover 2, the BMS cover 5 and the die-cast shell 1, and the first sealing layer 7 and the second sealing layer 8 include but are not limited to sealing rings or silicone pads; optionally, the battery cell opening 111 is provided with a circle of first make way grooves 71 corresponding to the first sealing layer 7, and / or, the BMS opening 121 is provided with a circle of second make way grooves 81 corresponding to the second sealing layer 8. By providing the first make way grooves 71 and the second make way grooves 81, a better sealing effect can be provided for the first sealing layer 7 and the second sealing layer 8, so that the surface fits more closely, and the entry or leakage of substances such as gas, liquid or dust can be effectively prevented; at the same time, the first sealing layer 7 and the second sealing layer 8 can be provided with fixing and positioning functions to avoid movement or falling off during use, which helps to maintain the stability and durability of the seal. It should be noted that the first clearance groove 71 and the second clearance groove 81 can be arc grooves corresponding to the sealing ring, or can be rectangular grooves corresponding to the silicone pad, which is not specifically limited in this embodiment. The BMS opening 121 and the battery cell opening 111 can adopt a structure with an arc to adapt to BMS cover 5 and battery cover 2 of different shapes, so that the battery cover 2 can fit tightly with the battery cell opening 111, and the BMS cover 5 can fit tightly with the BMS opening 121.

[0054] It should be noted that the battery cover 2 and the cell opening 111 are connected by fasteners, and the BMS cover 5 and the BMS opening 121 are connected by fasteners, and the fasteners need to be arranged outside the first sealing layer 7 and the second sealing layer 8 to avoid damaging the sealing structure. In other embodiments, other assembly methods can be used instead of fastener locking, which is not specifically limited in this embodiment.

[0055] Optional, see Figure 1 As shown, in order to reduce the overall weight of the battery pack, a number of weight-reducing grooves 15 are die-cast on the outer surface of the die-cast shell 1. The weight-reducing grooves 15 include but are not limited to triangular grooves, rectangular grooves, strip grooves or honeycomb grooves, which can reduce the weight of the die-cast shell 1 and reduce the use of materials while maintaining the stability and bearing capacity of the structure; the weight-reducing grooves 15 can also provide a certain heat dissipation effect. Since the weight-reducing grooves 15 increase the surface area of ​​the die-cast shell 1, it is helpful to dissipate heat, thereby reducing the temperature of the battery pack and improving the performance and life of the battery.

[0056] Optional, see Figure 1 and Figure 7As shown, at least one auxiliary fixing part 9 is provided on the outer surface of the die-cast shell 1. In one embodiment, the auxiliary fixing parts 9 include three, which are respectively connected to the assembly part 14 of the die-cast shell 1 and the two side surfaces parallel to the assembly part 14 by screws. It should be noted that the screws do not penetrate the die-cast shell 1 to avoid breaking the sealing structure of the die-cast shell 1. The shape of the auxiliary fixing part 9 is not specifically limited and can be assembled and fixed according to the actual space inside the car, which can improve the fixing effect of the die-cast shell 1 and meet the overall mechanical reliability and safety of the battery pack.

[0057] The starting battery pack is a type of battery pack, such as a 12V auxiliary lithium battery, which has the functions of auxiliary starting, energy recovery, voltage stabilization and emergency power supply. However, the starting battery pack often adopts a combination structure of a soft pack and a plastic shell, and its shear resistance is relatively weak. "Shear resistance" usually refers to the resistance of a material or structure when subjected to a shear force. A shear force is a force acting on an object, attempting to cause it to move relative to a direction parallel to the force. Therefore, in order to improve its shear resistance, all the structures in the above embodiments can also be transferred to the starting battery pack to improve the shear resistance of the starting battery pack.

[0058] In summary, the battery pack provided by the utility model has the following technical effects:

[0059] 1. Improving the balance and stability of the battery module 3: By stacking the battery cells 311 in the battery module 3 along the direction of the battery cell opening 111 to form a horizontal arrangement, compared with the horizontally stacked battery modules 3, this design improves the balance and stability of the battery module 3, thereby making the battery module 3 located in the die-cast shell 1 safer and more resistant to shear.

[0060] 2. Meeting the requirements of extrusion working conditions: The plastic shell is replaced with a die-cast shell 1, which improves the inherent strength of the starting battery pack, thereby meeting the requirements of extrusion working conditions.

[0061] 3. Improve the stability and balance of the battery pack: The internal battery cells 311 are stacked horizontally, which can achieve better weight distribution and help improve the stability and balance of the entire battery pack. This can reduce structural problems caused by weight imbalance during use of the battery pack and improve the controllability of the CB.

[0062] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A battery pack, characterized in that: include: A die-cast housing (1), the die-cast housing (1) having a accommodating cavity, the accommodating cavity comprising a battery cell accommodating cavity (11) and a BMS accommodating cavity (12), a battery cell opening (111) being provided on a side of the battery cell accommodating cavity (11) away from the BMS accommodating cavity (12), and a BMS opening (121) being provided on a side of the BMS accommodating cavity (12) away from the battery cell accommodating cavity (11); A battery cover (2), the battery cover (2) being sealed and connected to the battery cell opening (111); A BMS cover (5), the BMS cover (5) being sealed and connected to the BMS opening (121); A battery module (3), the battery module (3) being assembled in the battery cell accommodating cavity (11), the battery module (3) comprising at least two battery cells (311), the battery cells (311) being stacked along the direction of the battery cell opening (111); A BMS (4), the BMS (4) is installed in the BMS accommodating cavity (12) and is electrically connected to the battery module (3).

2. A battery pack according to claim 1, characterized in that: A partition plate (13) is provided between the battery cell accommodating chamber (11) and the BMS accommodating chamber (12), and a wiring hole (131) is provided on the partition plate (13).

3. A battery pack according to claim 1, characterized in that: The battery module (3) comprises: A battery cell group (31), wherein the battery cell group (31) is formed by stacking battery cells (311); A first casing (32), the first casing (32) being sleeved on one end of the battery cell group (31); A second casing (33), the second casing (33) being sleeved on the other end of the battery cell group (31); A filling piece (34) is provided in the gap between the first shell (32) and the second shell (33), and the filling piece (34) abuts against the battery cell group (31).

4. A battery pack according to claim 3, characterized in that: A limiting member (35) is provided between the battery module (3) and the battery cell accommodating cavity (11), and the limiting member (35) abuts against the battery module (3) and the battery cell accommodating cavity (11) respectively.

5. A battery pack according to claim 4, characterized in that: The outer surface of the first shell (32) and / or the second shell (33) is provided with a plurality of convex ribs (36), and at least part of the convex ribs (36) abuts against the limiting member (35).

6. A battery pack according to claim 1, characterized in that: A hole is provided on one side of the BMS accommodating chamber (12), a plug (123) for plugging with the BMS (4) is provided in the hole, and a dust plug (124) is provided on the plug (123).

7. A battery pack according to claim 6, characterized in that: The side wall of the BMS receiving chamber (12) on which the hole is arranged is the first side wall (122); the side wall of the battery cell receiving chamber (11) corresponding to the first side wall (122) is the second side wall (112); a step surface (113) is arranged between the first side wall (122) and the second side wall (112); the width of the step surface (113) is the distance from the first side wall (122) to the second side wall (112); and the length of the dust plug (124) after being assembled with the plug (123) is less than the width of the step surface (113).

8. The battery pack according to claim 1, characterized in that: A first sealing layer (7) is provided between the battery cover (2) and the battery cell opening (111), and a second sealing layer (8) is provided between the BMS cover (5) and the BMS opening (121).

9. A battery pack according to claim 8, characterized in that: The cell opening (111) is provided with a first clearance groove (71) around the first sealing layer (7), and / or the BMS opening (121) is provided with a second clearance groove (81) around the second sealing layer (8).

10. A battery pack according to claim 2, characterized in that: The wiring hole (131) of the partition plate (13) is provided with an insulating die-casting (6); the battery module (3) is connected with a first positive electrode connecting piece (37) and a first negative electrode connecting piece (38); the BMS (4) is connected with a second positive electrode connecting piece (41) and a second negative electrode connecting piece (42); the insulating die-casting (6) includes a first die-casting hole (61) and a second die-casting hole; the first die-casting hole (61) is penetrated by a first connector; the second die-casting hole is provided with a second connector; the first connector conducts and fixes the first positive electrode connecting piece (37) and the second positive electrode connecting piece (41); the second connector conducts and fixes the first negative electrode connecting piece (38) and the second negative electrode connecting piece (42).

11. A battery pack according to any one of claims 1 to 10, characterized in that: A plurality of weight-reducing grooves (15) are die-cast on the outer surface of the die-cast housing (1).

12. A battery pack according to any one of claims 1 to 10, characterized in that: At least one auxiliary fixing piece (9) is provided on the outer surface of the die-cast housing (1).

13. A battery pack according to any one of claims 1 to 10, characterized in that: The battery pack is a starting battery pack.

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