Battery box body and battery pack

Abstract

Partition plates in the battery box body are arranged in a lower box body, an upper cover and the partition plates are fastened, the middle of a large surface of the upper cover does not shake up and down, and when a battery cell stacking body is arranged in a containing bin formed between the partition plates, the large surface of the upper cover is attached to the large surface of the battery cell stacking body, so that the battery cell stacking body is prevented from being damaged. Safety space does not need to be reserved, the longitudinal space utilization rate of the battery pack is increased, and the system cycle service life is prolonged; and the peripheral side of the upper cover and the peripheral side of the lower box body are sealed and fixed, so that the sealing performance of the battery box body is ensured.

Description

Technical Field

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

[0002] Existing battery systems are generally divided into two states: with modules and without modules. For battery systems with modules, the cells are assembled into modules and then assembled into a battery box. The modules have cover plates, side plates, etc. For battery systems without modules, the cells are directly stacked into the box and then covered. For battery systems with modules, each module has cover plates, side plates, etc., which increases the space occupied by the system and the efficiency of the system production process is low. For battery systems without modules, in order to overcome the expansion problem during the recycling of cells, it is generally necessary to place a pressure plate on the cell stack, which contacts the large surface of the cell stack through the pressure plate, and is fixed to the partitions on both sides of the cell stack by bolts, so that the cell stack is pressed tightly into the battery box. In order to ensure the sealing performance of the battery system, a box cover is added outside the pressure plate, and the surrounding side of the box cover is sealed with a sealing ring and fixed with bolts to the surrounding side of the box.

[0003] However, in larger battery packs, the box cover has a large area and is relatively thin. During use, the middle of the large surface of the box cover will shake up and down. In order to prevent the shaking of the box cover from affecting the pressure plate and the battery cell stack, a safety space of about 5 mm needs to be reserved between the pressure plate and the box cover, which makes the limited longitudinal space of the battery pack not fully utilized, reducing the system space utilization. Utility Model Content

[0004] The main purpose of the present application is to provide a battery box, aiming to solve the problem of low volume utilization of existing battery boxes due to the need to reserve a safety space due to the up and down swinging of the box cover.

[0005] In order to achieve the above-mentioned object, the first aspect of the utility model provides a battery box, including an upper cover, a lower box and a plurality of partitions;

[0006] The upper cover is covered with the lower box to form a containing space;

[0007] A plurality of partitions are arranged in the lower box body, dividing the accommodation space into a plurality of accommodation compartments for accommodating battery cell stacks, and the thickness direction of the partitions is perpendicular to the depth direction of the battery box body;

[0008] The upper cover is fixedly connected to the partition, and the peripheral side of the upper cover is sealed and fixed to the peripheral side of the lower box body.

[0009] Furthermore, it also includes a reinforcing plate, which is stacked with the upper cover and fixedly connected to a side of the upper cover away from the partition.

[0010] Furthermore, the reinforcing plate is formed into a reinforcing area and a flattening area by stamping, the reinforcing area forms a convex rib in a direction away from the upper cover, there is a gap between the reinforcing area and the upper cover, and the flattening area is fitted and fixed to the upper cover.

[0011] Furthermore, the reinforcing plate is welded to the upper cover, and the welding point is located in the flat area.

[0012] Furthermore, a fixing groove is recessed on the top surface of the partition in a direction away from the upper cover, and a through hole is provided in the upper cover for the sealing member to pass through, and the sealing member passes through the through hole and is fixed in the fixing groove.

[0013] Furthermore, the reinforcing plate is provided with an avoidance hole corresponding to the sealing component, and the area of ​​the avoidance hole is larger than that of the through hole.

[0014] Furthermore, the sealing member is a sealing bolt, and a nut matching the sealing bolt is provided on the peripheral side of the fixing groove.

[0015] Furthermore, the sealing bolt comprises a sealing ring and a stud, the sealing ring is fixedly connected to one end of the stud, a sealing groove is recessed on a side of the sealing ring close to the stud, and a sealing ring is sleeved in the sealing groove.

[0016] Furthermore, the partition is a liquid cooling plate, and a cooling channel for circulating cooling liquid is provided in the liquid cooling plate.

[0017] On the other hand, the utility model proposes a battery pack, including a battery case as described in any of the above embodiments, and also including a battery cell stack, a buffer and a thermal insulation component, the battery cell stack is installed in the accommodating compartment, and the large surface of the battery cell stack faces the upper cover; the buffer fits the large surface of the battery cell stack close to the upper cover, and the thermal insulation component is installed between the buffer and the upper cover.

[0018] Beneficial effects:

[0019] The utility model provides a battery box, in which a partition is arranged in a lower box. By fastening an upper cover and the partition, a large surface of the upper cover will not shake up and down. When a battery cell stack is contained in a accommodating compartment formed between the partitions, a large surface of the upper cover fits with a large surface of the battery cell stack. The upper cover will not shake up and down under the support and fixation of the partition, thereby affecting the battery cell stack. Therefore, there is no need to reserve a safety space, thereby improving the longitudinal space utilization rate of the battery pack and the system cycle service life. Moreover, the peripheral side of the upper cover and the peripheral side of the lower box are sealed and fixed, thereby ensuring the sealing of the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of an explosion of a battery pack in one embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of a battery box in one embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the upper cover in one embodiment of the utility model;

[0023] Figure 4 It is a structural schematic diagram of a reinforcing plate in one embodiment of the utility model;

[0024] Figure 5 It is a schematic diagram of the top view of the battery pack in one embodiment of the utility model;

[0025] Figure 6 yes Figure 5 Schematic diagram of the partial section;

[0026] Figure 7 yes Figure 6 A partial enlarged schematic diagram of point I in the middle.

[0027] in:

[0028] 1. Battery box;

[0029] 11. upper cover; 111. through hole; 112. large surface area; 113. concave-convex area; 114. sealing area; 1140. reinforcing ribs;

[0030] 12. Lower box;

[0031] 13. partition; 131. containing chamber; 132. fixing groove; 1321. nut; 133. cooling channel;

[0032] 14. Reinforcement plate; 141. Reinforcement area; 142. Smooth area; 143. Avoidance hole;

[0033] 15. Sealing bolt; 151. Sealing ring; 1511. Sealing groove; 152. Stud;

[0034] 16. Sealing ring;

[0035] 2. Battery cell stack;

[0036] 3. Buffer parts;

[0037] 4. Insulation parts.

[0038] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] Reference Figure 1-7 , an embodiment of the utility model provides a battery box 1, including an upper cover 11, a lower box 12 and a plurality of partitions 13;

[0044] The upper cover 11 covers the lower box body 12 to form a receiving space;

[0045] A plurality of partitions 13 are disposed in the lower box 12 to divide the accommodation space into a plurality of accommodation compartments 131 for accommodating the battery cell stack 2, and the thickness direction of the partitions 13 is perpendicular to the depth direction of the battery box 1;

[0046] The upper cover 11 is fixedly connected to the partition plate 13 , and the peripheral side of the upper cover 11 is sealed and fixed to the peripheral side of the lower box body 12 .

[0047] In the above embodiment, the partition 13 is arranged in the lower box body 12. By fastening the upper cover 11 and the partition 13, the large surface of the upper cover 11 will not shake up and down. When the accommodating compartment 131 formed between the partitions 13 contains the battery cell stack 2, the large surface of the upper cover 11 fits with the large surface of the battery cell stack 2. Under the support and fixation of the partition 13, the upper cover 11 will not shake up and down to affect the battery cell stack 2. Therefore, there is no need to reserve a safety space, which improves the longitudinal space utilization rate of the battery pack and the system cycle service life; and the peripheral side of the upper cover 11 and the peripheral side of the lower box body 12 are sealed and fixed to ensure the sealing of the battery box body 1.

[0048] In the above embodiment, the lower box body 12 includes a bottom surface and a side wall, and the lower box body 12 is open on one side of the upper cover 11. A plurality of partitions 13 are horizontally arranged in the lower box body 12, and the thickness direction of the partition 13 is perpendicular to the depth direction of the battery box body 1, that is, the partition 13 is perpendicular to the bottom surface of the lower box body 12 and the partition 13 abuts against the lower box body 12; when the upper cover 11 covers one side of the opening of the lower box body 12, the top surface of the partition 13 abuts against the upper cover 11; electrical components connected to the battery cell stack 2 are placed at both ends of the lower box body 12, which are separated by a partition 13, and the battery cell stack 2 is placed on the other side of the partition 13, and the partition 13 is also placed on the other side of the battery cell stack 2, so that partitions 13 are placed on both sides of each battery cell stack 2. After the partition 13 is fixed to the upper cover 11, each battery cell stack 2 is evenly subjected to pre-pressure from the upper cover 11 and the lower box body 12.

[0049] Reference Figure 3 In the above embodiment, the upper cover 11 includes a large surface area 112 in the middle corresponding to the battery cell stack 2, concave-convex areas 113 at both ends corresponding to the electrical components, and a sealing area 114 corresponding to the peripheral side of the lower box 12; the large surface area 114 is a flat large surface for fitting the large surface of the battery cell stack 2; the concave-convex area 113 is provided with convex ribs to increase the strength of the upper cover 11; the sealing area 114 is the circumferential edge of the upper cover 11, which is used to connect and seal with the side wall of the lower box 12. Preferably, the sealing area 114 of the upper cover 11 is bent toward the side wall of the lower box 12 to form an "L"-shaped reinforcing rib 1140 to increase the bending strength of the upper cover 11.

[0050] In one embodiment, the battery box 1 further includes a reinforcing plate 14, which is stacked with the upper cover 11 and fixedly connected to a side of the upper cover 11 away from the partition 13. The reinforcing plate 14 can strengthen the strength of the upper cover 11, so that the upper cover 11 can better withstand external pressure, and increase the pressure resistance and structural stability of the entire battery box 1; the upper cover 11 and the reinforcing plate 14 can be fixedly connected and integrated into one body to form a box cover assembly for integrated supply, and then the integrated upper cover 11 and the lower box 12 are sealed to reduce the production process cost of the product.

[0051] Reference Figure 4 , 7 In the above embodiment, the reinforcing plate 14 is formed by stamping to form a reinforcing area 141 and a flat area 142. The reinforcing area 141 forms a convex rib in a direction away from the upper cover 11, and the flat area 142 is fixedly attached to the upper cover 11. Stamping can efficiently and accurately manufacture relatively complex shapes, such as Figure 4 The "I" shape shown in the figure, multiple "I" shapes are strung together and arranged in the same direction, which helps to prevent bending or deformation of the structure. The convex ribs in the reinforcement area 141 strengthen the strength of the reinforcement plate 14, and the flat area 142 is a flat surface, which is convenient for fitting and fixing with the upper cover 11; preferably, the reinforcement area 141 and the flat area 142 are distributed at intervals to make the strength of the reinforcement plate 14 more uniform.

[0052] In the above embodiment, the reinforcing plate 14 is welded to the upper cover 11, and the welding point is located at the flat area 142. When the reinforcing plate 14 is overlapped with the large surface area of ​​the upper cover 11, the flat area 142 of the reinforcing plate 14 fits the large surface area of ​​the upper cover 11 just right, and the reinforcing plate 14 and the upper cover 11 can be energized and melted by resistance welding, and fixed after cooling, so that the flat area 142 of the reinforcing plate 14 and the large surface area of ​​the upper cover 11 are permanently connected, will not loosen or fall off, and can withstand greater loads and stresses. In another embodiment, it can also be connected by other means such as fixing with a mechanical connector.

[0053] Reference Figure 3 , 7 In one embodiment, the top surface of the partition 13 is recessed with a fixing groove 132 in the direction away from the upper cover 11, and the upper cover 11 is provided with a through hole 111 for the seal to pass through, and the seal passes through the through hole 111 and is fixed in the fixing groove 132. The fixing groove 132 is recessed inwardly of the partition 13 and does not occupy additional space; the fixing groove 132 is used to accommodate part of the seal, and the seal passes through the through hole 111 of the upper cover 11, a part of which is fixed in the fixing groove 132 of the partition 13, and the other part is located on the side of the upper cover 11 away from the partition 13, which can ensure the close connection between the upper cover 11 and the partition 13, and effectively ensure the sealing effect of the battery box 1.

[0054] Reference Figure 3-7 In the above embodiment, the reinforcing plate 14 is provided with a avoidance hole 143 corresponding to the sealing member, and the area of ​​the avoidance hole 143 is larger than the through hole 111. Since the flat area 142 of the reinforcing plate 14 fits the upper cover 11, after the sealing member passes through the through hole 111 of the upper cover 11, a part of it remains on the side of the upper cover 11 away from the partition 13. The setting of the avoidance hole 143 avoids this part of the sealing member remaining on the side of the upper cover 11 away from the partition 13, ensuring that the part of the sealing member remaining in the large surface area of ​​the upper cover 11 will not be disturbed or squeezed, and the avoidance hole 143 plays a role in facilitating the fixing or loosening of the sealing member when the upper cover 11 and the reinforcing plate 14 are fixed to form an integral part. Preferably, the diameter of the avoidance hole 143 is 5 mm larger than the diameter of the through hole 111.

[0055] In one embodiment, the sealing member is a sealing bolt 15, and a nut 1321 matching the sealing bolt 15 is provided on the peripheral side of the fixing groove 132. After the sealing bolt 15 is matched and fixed with the nut 1321 in the fixing groove 132, it is not easy to loosen, and it is easy to install and disassemble. After the sealing bolt 15 passes through the through hole 111, it is matched and fixed with the nut 1321 in the fixing groove 132. After being fixed, the nut of the sealing bolt 15 remains on the side of the upper cover 11 away from the partition 13, and the avoidance hole 143 avoids the position of the nut. The shaft of the sealing bolt 15 passes through the through hole 111 and extends into the fixing groove 132. The diameter of the through hole 111 is adapted to the cross-sectional diameter of the shaft of the sealing bolt 15 to ensure the sealing performance of the sealing member.

[0056] In the above embodiment, the sealing bolt 15 includes a sealing ring 151 and a stud 152. The sealing ring 151 is fixedly connected to one end of the stud 152. A sealing groove 1511 is recessed on one side of the sealing ring 151 close to the stud 152. A sealing ring 16 is sleeved in the sealing groove 1511. The stud 152 passes through the through hole 111 of the upper cover 11, and the sealing ring 151 is left on the side of the upper cover 11 away from the partition 13. When the sealing bolt 15 is installed and pressure is applied, the sealing ring 16 will be squeezed and filled in the gap between the connecting parts, thereby forming a sealing effect.

[0057] In one embodiment, the partition 13 is a liquid cooling plate, and a cooling channel 133 for cooling liquid to flow is provided in the liquid cooling plate. The partition 13 is a liquid cooling plate, that is, the liquid cooling plate is attached to both sides of the battery cell stack 2, and the cooling channel 133 in the liquid cooling plate does not interfere with the fixing position of the upper cover 11 and the partition 13. The cooling material flowing in the cooling channel 133 can take away the heat of the battery cell stack 2, thereby improving the safety of the battery.

[0058] Reference Figure 1 , 5-7, the utility model proposes a battery pack, comprising a battery box 1 as described in any of the above embodiments, and also comprising a cell stack 2, a buffer 3 and a heat preservation member 4, wherein the cell stack 2 is installed in the accommodating chamber 131, and the large surface of the cell stack 2 faces the upper cover 11. The buffer 3 fits the large surface of the cell stack 2 close to the upper cover 11, and the heat preservation member 4 is installed between the buffer 3 and the upper cover 11. When the cell stack 2 is installed in the accommodating chamber 131, and the upper cover 11 covers the lower box 12, the cell stack 2 is simultaneously subjected to pre-pressure from the upper cover 11 and the lower box 12, wherein the upper cover 11 is directly fixedly connected to the partition 13 in the lower box 12, the large surface of the upper cover 11 can fit the large surface of the cell stack 2, and the upper cover 11 will not shake up and down under the support and fixation of the partition 13, thereby affecting the cell stack 2, so there is no need to reserve a safety space, which improves the longitudinal space utilization rate and system cycle service life of the battery pack. The buffer 3 is in close contact with the large surface of the battery stack 2, providing an elastic and buffering effect for the expansion or contraction of the battery stack 2, which helps to extend the service life of the battery and improve safety; the heat preservation member 4 is installed between the buffer 3 and the upper cover 11, and its function is to provide a heat preservation effect for the battery stack 2. Preferably, the buffer 3 is foam and the heat preservation member 4 is heat preservation cotton.

[0059] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery box, characterized in that: It includes an upper cover, a lower box body and a plurality of partitions; The upper cover is covered with the lower box to form a containing space; A plurality of partitions are arranged in the lower box body, dividing the accommodation space into a plurality of accommodation compartments for accommodating battery cell stacks, and the thickness direction of the partitions is perpendicular to the depth direction of the battery box body; The upper cover is fixedly connected to the partition, and the peripheral side of the upper cover is sealed and fixed to the peripheral side of the lower box body.

2. The battery box according to claim 1, characterized in that: It also includes a reinforcing plate, which is stacked with the upper cover and fixedly connected to a side of the upper cover away from the partition.

3. The battery box according to claim 2, characterized in that: The reinforcing plate is formed by stamping to form a reinforcing area and a flattening area, the reinforcing area forms a convex rib in a direction away from the upper cover, and the flattening area is fitted and fixed to the upper cover.

4. The battery box according to claim 3, characterized in that: The reinforcing plate is welded to the upper cover, and the welding point is located in the flat area.

5. The battery box according to claim 2, characterized in that: The top surface of the partition is recessed with a fixing groove in a direction away from the upper cover, and the upper cover is provided with a through hole for the sealing member to pass through, and the sealing member passes through the through hole and is fixed in the fixing groove.

6. The battery box according to claim 5, characterized in that: The reinforcing plate is provided with an avoidance hole corresponding to the sealing member, and the area of ​​the avoidance hole is larger than that of the through hole.

7. The battery box according to claim 5, characterized in that: The sealing member is a sealing bolt, and a nut matching the sealing bolt is provided on the peripheral side of the fixing groove.

8. The battery case according to claim 7, characterized in that: The sealing bolt comprises a sealing ring and a stud, wherein the sealing ring is fixedly connected to one end of the stud, a sealing groove is recessed on a side of the sealing ring close to the stud, and a sealing ring is sleeved in the sealing groove.

9. The battery box according to claim 1, characterized in that: The partition is a liquid cooling plate, and a cooling channel for cooling liquid to flow is arranged in the liquid cooling plate.

10. A battery pack, characterized in that: It includes a battery case as described in any one of claims 1 to 9, and also includes a battery cell stack, a buffer and a thermal insulation component, the battery cell stack is installed in the accommodating compartment, and the large surface of the battery cell stack faces the upper cover; the buffer fits the large surface of the battery cell stack close to the upper cover, and the thermal insulation component is installed between the buffer and the upper cover.

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