Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack which comprises a box body, a plurality of battery cells and a busbar assembly, an accommodating space is formed in the box body; the at least two busbar assemblies are arranged in the accommodating space at intervals; the multiple battery cells are stacked in the containing space in the second direction, the busbar assemblies are arranged at the two ends of the battery cells in the first direction, each busbar assembly comprises a confluence part and a supporting plate, and the confluence parts are arranged on the surfaces, facing the battery cells, of the supporting plates; the battery cell is arranged in the first direction, the two ends of the battery cell in the first direction are provided with pole columns, the pole columns are provided with bosses, the battery cell is detachably connected with the supporting plate through the bosses, and the battery cell is electrically connected with the confluence part through the pole columns, the pole columns of the battery cell are connected with the supporting plate in a detachable connection mode, and the pole columns of the battery cell directly make contact with the confluence part to complete electric connection. And the difficulty in disassembling the battery cell and the risk of damaging peripheral parts can be greatly reduced, and the faulted battery cell can be more easily and effectively replaced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs. Background Technology

[0002] With the continuous development of new energy vehicle technology and the increasing demand for its use, the research and development of power batteries, a key component of new energy vehicles, is also ongoing. Blade batteries, due to their structural dimensions being well-suited to module-less battery systems, have been widely used in module-less battery packs.

[0003] Currently, existing module-less battery packs typically include a casing, busbar assembly, and battery cells. The busbar assembly has a busbar for electrical connection between the battery cells. The battery cells and busbars are usually welded together. Although this fixing method is relatively reliable, it requires destructive disassembly to separate the battery cells from the busbar assembly during later inspection and maintenance. Furthermore, welding is difficult to perform during subsequent installation. Therefore, the existing connection method between battery cells and busbar assembly presents a problem of difficulty in inspection and maintenance. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to solve the problem that existing module-less battery packs are difficult to inspect and maintain.

[0005] In a first aspect, this utility model provides a battery pack, comprising: a housing, multiple battery cells, and busbar assemblies; the housing has an internal accommodating space; at least two busbar assemblies are spaced apart in the accommodating space along a first direction; multiple battery cells are stacked in the accommodating space along a second direction, the busbar assemblies are disposed at both ends of the battery cells in the first direction, the busbar assemblies include a busbar portion and a support plate, the busbar portion is disposed on the surface of the support plate facing the battery cells; the battery cells have terminals at both ends along the first direction, the terminals have bosses, the battery cells are detachably connected to the support plate through the bosses, and the battery cells are electrically connected to the busbar portion through the terminals.

[0006] Beneficial effects: The battery cell's terminals are connected to the support plate via a detachable connection. Based on this, the battery cell's terminals can directly contact the busbar to complete the electrical connection. Compared with the conventional welding connection method, the battery cell can be separated from the busbar without destructive disassembly, which can greatly reduce the difficulty of battery cell disassembly and the risk of damaging surrounding components. When the battery pack is under maintenance, faulty battery cells can be replaced more easily and effectively, effectively solving the problem of difficult maintenance of existing module-less battery packs.

[0007] In one optional embodiment, the support plate extends along the second direction, and the side of the support plate near the battery cell is provided with a plurality of limiting grooves. The plurality of limiting grooves are spaced apart along the second direction, and the limiting grooves extend along the third direction and are used to be plugged into the corresponding pole post. The busbar is located between the pole post and the support plate.

[0008] Beneficial effects: Since the battery cells are stacked, after the terminals and limiting slots are inserted and matched, the movement of the battery cells in directions other than the third direction cannot be restricted. It can also guide the docking process between the battery cells and the busbar during assembly, thereby improving assembly stability and the reliability of the docking between the battery cells and the busbar.

[0009] In one alternative embodiment, the busbar includes multiple busbar components, each of which includes a busbar and an elastic pad. The elastic pad is located between the busbar and a support plate, and the busbar abuts against the terminal of an adjacent cell through the elastic pad.

[0010] Beneficial effects: Under the elastic force of the elastic pad, the busbar can continuously and tightly fit with the terminal post, ensuring the reliability of the electrical connection. When the battery pack is bumped or vibrated, the terminal post can still reliably contact the busbar.

[0011] In one optional embodiment, the support plate includes a plate body and a plurality of limiting components. The wall surface of the plate body near the cell forms a mounting surface. The plurality of limiting components are spaced apart on the mounting surface along a second direction. At least one side surface of the limiting components in the second direction has a limiting groove. The limiting groove is recessed in a direction away from the adjacent limiting component. The pole post engages with the limiting groove through its own boss.

[0012] Beneficial effects: This snap-fit ​​connection effectively restricts the movement of the battery cell along the first direction, making the battery cell and busbar assembly more stable and reliable, and further reducing the risk of loosening between them.

[0013] In one alternative embodiment, the limiting assembly includes at least two limiting members spaced apart along a third direction; and / or, the mounting surface is provided with a busbar groove for mounting the busbar assembly.

[0014] Beneficial effects: Compared with a single integral limit component, multiple spaced limit components can meet the limit requirements while requiring less manufacturing material, effectively reducing the overall weight of the limit component. In addition, the busbar component is set in the busbar slot, which can effectively improve the positioning accuracy of the busbar component.

[0015] In one alternative embodiment, the busbar assembly further includes a data acquisition unit disposed on one side of the support plate near the battery cell and extending along a second direction. The data acquisition unit is electrically connected to the current collection unit and thermally cooperates with the battery cell.

[0016] Beneficial effects: The data acquisition unit is simple and reliable to set up, and can collect data from the battery cells by relying on the support plate, which facilitates processing and manufacturing.

[0017] In one optional embodiment, the acquisition unit includes a flexible circuit board, multiple conductive elements, and multiple heat-conducting elements. The flexible circuit board is disposed on one side of the support plate near the battery cell and extends along a second direction. The conductive elements and heat-conducting elements are spaced apart on the flexible circuit board along the second direction. The flexible circuit board is electrically connected to the corresponding busbar through the conductive elements, and the flexible circuit board is thermally connected to the corresponding battery cell through the heat-conducting elements.

[0018] Beneficial effects: The acquisition unit has a simple and reliable structure, and can stably and reliably acquire data from the battery cells.

[0019] In one alternative embodiment, the battery pack further includes straps and a cooling plate, the cooling plate covering the top of the battery cell, the battery cell being secured by straps, the cooling plate being located between the straps and the battery cell, and the cooling plate engaging with the battery cell via the straps.

[0020] Beneficial effects: The cooling plate can regulate the temperature of the battery cell and make the downward pressure of the straps more evenly applied to the battery cell. In addition, using straps to fix the battery cell in the box and fixing the battery cell with a detachable mechanical fixing method can avoid the problem of the battery cell being unable to be removed when using structural adhesive to fix it, and make it easier to replace individual battery cells.

[0021] In one alternative embodiment, the bottom surface of the box is provided with a perforation that extends along a second direction and communicates with the receiving space, and a strap is threaded through the perforation.

[0022] Beneficial effects: With this type of strap arrangement, the box can be directly connected to the straps through its own structure, without the need for additional parts for fixation.

[0023] In one alternative embodiment, the battery pack further includes end plates, with end plates respectively provided at both ends of the battery cells stacked along the second direction, and the end plates abutting and cooperating with the battery cells at the ends by straps.

[0024] Beneficial effects: The end plate can not only prevent the battery cell from directly contacting the inner wall of the housing, but also improve the uniformity of force on the battery cell located at the second direction end, and prevent excessive local pressure on the strap from damaging the battery cell. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional schematic diagram of a battery pack after assembly according to an embodiment of the present utility model;

[0027] Figure 2 for Figure 1 The diagram shown is an exploded view of the battery pack and case cover during assembly.

[0028] Figure 3 for Figure 1 An exploded view of the battery pack shown, excluding the casing;

[0029] Figure 4 for Figure 3 An exploded view of the busbar assembly of the battery pack shown;

[0030] Figure 5 for Figure 4 A partially enlarged schematic diagram of the busbar assembly shown;

[0031] Figure 6 for Figure 5 A three-dimensional schematic diagram of the busbar assembly after assembly;

[0032] Figure 7 for Figure 4 The busbar assembly and battery cells shown are in an exploded top view.

[0033] Figure 8 for Figure 4 The busbar assembly and battery cells shown are in an exploded state side view.

[0034] Figure 9 for Figure 1 The battery pack shown is a 3D schematic diagram showing only the casing and straps.

[0035] Figure 10 for Figure 9 The diagram shows a partial view of the battery pack in its cut-out state.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Enclosure; 101. Storage space; 102. Perforation; 103. Enclosure cover; 2. Battery cell; 201. Terminal;

[0038] 3. Busbar assembly;

[0039] 301, manifold; 3011, busbar; 3012, elastic pad;

[0040] 302. Support plate; 3021. Limiting groove; 3022. Plate body; 3023. Limiting component; 3024. Assembly surface; 3025. Limiting part; 3026. Manifold;

[0041] 303, Acquisition Unit; 3031, Flexible Circuit Board; 3032, Conductive Component; 3033, Thermally Conductive Component;

[0042] 4. Straps; 5. Cooling plate; 501. Fasteners; 6. End plate; 7. Separator beam; 8. Thermal pad; 9. Insulating pad; 10. Insulation board. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] The following is combined with Figures 1 to 10 The following describes embodiments of the present invention.

[0045] According to an embodiment of the present invention, a battery pack is provided, comprising: a housing 1, a plurality of battery cells 2, a busbar assembly 3, and a strap 4; the housing 1 has an internal accommodating space 101; at least two busbar assemblies 3 are spaced apart in the accommodating space 101 along a first direction, and a battery cell 2 is formed between adjacent busbar assemblies 3, with a busbar assembly 3 having a current-collecting portion 301 on its surface facing the battery cell 2; the plurality of battery cells 2 are stacked in the battery cell 2 along a second direction, and the battery cell 2 has a terminal post 201 at both ends along the first direction, and the battery cell 2 abuts against the current-collecting portion 301 through its own terminal post 201; at least a portion of the strap 4 is connected to the housing 1, and the plurality of battery cells 2 are connected to the housing 1 through at least one strap 4.

[0046] In the battery pack of this embodiment, the terminal 201 of the cell 2 is connected to the support plate 302 via a detachable connection. Based on this, the terminal 201 of the cell 2 can be directly contacted with the current collector 301 to complete the electrical connection. Compared with the conventional welding connection method, the cell 2 can be separated from the current collector 301 without destructive disassembly, which can greatly reduce the difficulty of disassembling the cell 2 and the risk of damaging surrounding components. When the battery pack is under maintenance, the faulty cell 2 can be replaced more easily and effectively, which effectively solves the problem that the existing module-less battery pack is difficult to maintain.

[0047] In this embodiment, the second direction refers to Figure 3 The "second direction" indicated by the middle arrow can refer to the stacking direction of cell 2, or, in passenger vehicles, the front-to-back direction of the vehicle. The first direction refers to... Figure 3 The "first direction" indicated by the middle arrow can be the length extension direction of cell 2, or the width direction of the vehicle in a passenger car. The third direction refers to... Figure 3 The "third direction" indicated by the middle arrow can be the height direction of cell 2 or the battery pack, or the height direction of the vehicle in passenger cars.

[0048] Specifically, there is no limitation on the specific detachable connection method of the pole post 201 and the support plate 302. It can be that the support plate 302 of the two busbar assemblies 3 abuts against the corresponding boss to hold the battery cell 2, so that the busbar 301 and the pole post 201 are in continuous contact and electrically connected. Alternatively, it can be that the support plate 302 and the pole post 201 are connected by a plug-in or snap-fit ​​structure to cooperate with the boss, so that the busbar 301 and the pole post 201 are in continuous contact and electrically connected. The choice can be made flexibly according to the requirements.

[0049] In one possible implementation, the support plate 302 extends along the second direction, and the side of the support plate 302 near the battery cell 2 is provided with a plurality of limiting grooves 3021. The plurality of limiting grooves 3021 are spaced apart along the second direction and extend along the third direction and are used to be inserted and cooperate with the corresponding terminal post 201. The busbar 301 is located between the terminal post 201 and the support plate 302. Since the battery cells 2 are stacked, after the terminal post 201 is inserted and cooperated with the limiting groove 3021, it can not only restrict the movement of the battery cells 2 in directions other than the third direction, but also guide the docking process between the battery cells 2 and the busbar 301 during assembly, thereby improving the assembly stability and the docking reliability between the battery cells 2 and the busbar 301.

[0050] Specifically, the opening direction of the limiting groove 3021 is not limited. It can be facing the first direction or the second direction, as long as it can guide the assembly process of the pole post 201 and the junction 301.

[0051] When the opening of the limiting groove 3021 faces the second direction, the pole post 201 can cooperate with the limiting groove 3021 through its own column structure; when the opening of the limiting groove 3021 faces the first direction, a protruding structure protruding along the first direction needs to be provided on the outer wall of the pole post 201, and only the pole post 201 in this form can be inserted and cooperate with the limiting groove 3021.

[0052] In one possible implementation, the busbar 301 includes multiple busbar components, each including a busbar 3011 and an elastic pad 3012. The elastic pad 3012 is located between the busbar 3011 and the support plate 302. The busbar 3011 abuts against the terminal 201 of the adjacent cell 2 through the elastic pad 3012. When the terminal 201 abuts against the busbar 3011 and compresses the elastic pad 3012, the busbar 3011 can continue to fit tightly against the terminal 201 under the elastic force of the elastic pad 3012, ensuring the reliability of the electrical connection. When the battery pack is bumped or vibrated, the terminal 201 can still reliably abut against the busbar 3011.

[0053] Specifically, such as Figure 5 and Figure 6 As shown, multiple busbar components are spaced apart along the second direction.

[0054] Furthermore, electrical connection can be achieved by continuously contacting the terminal 201 and the busbar 3011 without the need for welding or other connection methods. When separating the terminal 201 and the busbar 3011, no destructive disassembly methods are required.

[0055] In one possible implementation, such as Figures 5 to 8 As shown, the support plate 302 includes a plate body 3022 and a plurality of limiting components 3023. The wall surface of the plate body 3022 near the cell 2 forms an assembly surface 3024. The plurality of limiting components 3023 are spaced apart on the assembly surface 3024 along a second direction. At least one side surface of the limiting component 3023 in the second direction has a limiting groove 3021. The limiting groove 3021 is recessed in a direction away from the adjacent limiting component 3023. The pole post 201 engages with the limiting groove 3021 through its own boss. This engaging engagement can effectively restrict the movement of the cell 2 along the first direction, making the cell 2 and the busbar assembly 3 more stable and reliable, and further reducing the risk of loosening between the two.

[0056] The snap-fit ​​refers to the fact that the boss and the limiting groove 3021 can be connected by their own structure without the need for additional fixing parts, which can reduce the number of parts required when connecting the two.

[0057] Specifically, there is no limit to the number of limit components 3023 for a busbar assembly 3. The limit components 3023 can correspond one-to-one with the number of battery cells 2, or the limit components 3023 can be engaged with multiple battery cells 2 at the same time, which can be selected according to the requirements.

[0058] Preferably, such as Figure 7 As shown, each limiting component 3023 has limiting grooves 3021 on both sides of the second direction. One limiting component can simultaneously cooperate with two battery cells 2 for limiting. This form of limiting component 3023 can greatly reduce the number of limiting components 3023 used.

[0059] In one possible implementation, the limiting component 3023 includes at least two limiting members 3025 spaced apart along a third direction. Compared to a single integral limiting member 3025, the spaced-apart limiting members 3025 can meet the limiting requirements while requiring less manufacturing material, effectively reducing the overall weight of the limiting component 3023 and making the busbar component 3 lighter.

[0060] Specifically, such as Figure 6 As shown, since the function of the busbar 3011 is to connect the terminals 201 of two adjacent cells 2, this type of limiting component 3023 arrangement allows the busbar 3011 to pass directly through the gap between the two limiting components 3025, so that the busbar 3011 does not need to go around, which can reduce the overall area and material of the busbar 3011, thereby reducing the weight and manufacturing difficulty of the busbar 3011.

[0061] In one possible implementation, such as Figure 5 As shown, the assembly surface 3024 is provided with a combiner groove 3026 for installing the combiner assembly. The combiner assembly is set in the combiner groove 3026, which can effectively improve the positioning accuracy of the combiner assembly. In addition, it can also prevent the combiner assembly from deviating from its initial position and separating from the terminal post 201 under the vibration of the battery pack.

[0062] The method of fitting between the busbar assembly and the support plate 302 is not limited. The busbar assembly can be fixed by bonding to the busbar 3011 and the mounting surface 3024 respectively through the elastic pad 3012.

[0063] In one possible implementation, the busbar assembly 3 further includes a data acquisition unit 303. The data acquisition unit 303 is disposed on one side of the support plate 302 near the battery cell 2 and extends along the second direction. The data acquisition unit 303 is electrically connected to the current collector 301 and thermally cooperates with the battery cell 2. The configuration of the data acquisition unit 303 is simple and reliable. It can acquire data from the battery cell 2 by relying on the support plate 302, which is convenient for processing and manufacturing.

[0064] Specifically, the information collected by the acquisition unit 303 is not limited and can be voltage, current, temperature, etc.

[0065] In one possible implementation, the acquisition unit 303 includes a flexible circuit board 3031, a plurality of conductive elements 3032, and a plurality of heat-conducting elements 3033. The flexible circuit board 3031 is disposed on one side of the support plate 302 near the battery cell 2 and extends along a second direction. The conductive elements 3032 and the heat-conducting elements 3033 are spaced apart on the flexible circuit board 3031 along the second direction. The flexible circuit board 3031 is electrically connected to the corresponding busbar 3011 through the conductive elements 3032. The flexible circuit board 3031 is thermally connected to the corresponding battery cell 2 through the heat-conducting elements 3033. The acquisition unit 303 has a simple and reliable structure and can stably and reliably acquire data from the battery cell 2.

[0066] Specifically, such as Figure 6 As shown, the acquisition unit 303 is located at the upper third direction of the support plate 302. This arrangement makes it easier to observe the connection status of the acquisition unit 303 and facilitates inspection and maintenance.

[0067] In one possible implementation, the battery pack further includes a strap 4 and a cooling plate 5. The cooling plate 5 covers the top of the battery cell 2, and the battery cell 2 is secured by the strap 4. The cooling plate 5 is located between the strap 4 and the battery cell 2, and the cooling plate 5 abuts against the battery cell 2 through the strap 4. The cooling plate 5 can regulate the temperature of the battery cell 2 and also make the downward pressure of the strap 4 more evenly applied to the battery cell 2. In addition, using the strap 4 to fix the battery cell 2 in the housing 1 and fixing the battery cell 2 by a detachable mechanical fixing method can avoid the problem that the battery cell 2 cannot be removed when using structural adhesive to fix it, and can make it easier to replace individual battery cells 2.

[0068] It should be noted that the top of cell 2 refers to the end of cell 2 that is furthest away from housing 1 in the third direction.

[0069] Specifically, there is no limitation on the connection position between the strap 4 and the housing 1. The strap 4 can be connected to the bottom of the housing 1 or to the crossbeam of the housing 1, as long as it can fix the battery cell 2 in the housing 1.

[0070] In addition, there are no restrictions on the material of the strap 4. It can be made of rubber, nylon, etc., and can be an elastic strap or a non-elastic strap. The choice can be flexible according to the needs.

[0071] Furthermore, there is no limit to the number of straps 4. Multiple battery cells 2 can be fixed at the same time by one or more straps 4, or one or some battery cells 2 can be fixed at the same time by one or more straps 4. The choice can be made flexibly according to the needs.

[0072] Specifically, such as Figure 2 and Figure 9 As shown, the battery pack also includes a separator beam 7 and a cooling plate 5. The housing space 101 is provided with multiple rows of battery cells 2 stacked along the second direction. The multiple rows of battery cells 2 are separated by the separator beam 7. The cooling plate 5 is covered on the top of the multiple rows of battery cells 2. The cooling plate 5 is detachably connected to the separator beam 7 by fasteners 501. The separator beam 7 can both support and fix the position of the cooling plate 5, and also prevent the cooling plate 5 from pressing down completely on the battery cells 2, thus avoiding damage to the battery cells 2 caused by the cooling plate 5.

[0073] It is understood that, as an alternative implementation, the housing 1 may also contain only one row of battery cells 2 stacked along the second direction, in which case the partition beam 7 is not required.

[0074] Furthermore, such as Figure 3 As shown, the housing 1 is also provided with an inlet hole and an outlet hole for passing through the inlet pipe and the outlet pipe. The inlet of the internal flow channel of the cooling plate 5 is connected to the inlet pipe, and the outlet is connected to the outlet pipe. The battery pack also includes a thermal pad 8, which is located between the cooling plate 5 and the battery cell 2 to improve the heat transfer efficiency and ensure the temperature control effect of the cooling plate 5.

[0075] Preferably, the thermal pad 8 is made of thermally conductive silicone.

[0076] It should be noted that the cooling plate 5 here is not limited to cooling; it can also be used to raise the temperature of the battery cell 2, serving as a heating plate.

[0077] In one possible implementation, the bottom surface of the housing 1 is provided with a through hole 102, which extends along the second direction and communicates with the receiving space 101. The strap 4 is inserted through the through hole 102. With this arrangement of the strap 4, the housing 1 can be directly connected to the strap 4 through its own structure without the need for additional components for fixation. In addition, the connection between the strap 4 and the bottom surface of the housing 1 allows for more reliable restriction of the displacement of the battery cell 2 in the third direction after the battery cell 2 is subsequently fixed.

[0078] It is understandable that, as an alternative implementation, the strap 4 can also be connected to the housing 1 by means of adhesive bonding, snap-fit, or fastener fixation.

[0079] It should be noted that the bottom surface of the housing 1 refers to the side of the housing 1 that is used to support the battery cell 2 in the third direction.

[0080] Furthermore, such as Figure 10As shown, the bottom of the box 1 is provided with a double bottom plate. The double bottom plates are spaced apart in the third direction. The space between the double bottom plates forms a through space. The upper bottom plate is used to support the battery cell 2. Multiple through holes are provided in pairs on the upper bottom plate. Two adjacent through holes and the through space between them together form a through hole 102.

[0081] In one possible implementation, the strap 4 is an elastic element. This type of strap 4 can more stably and reliably fix the battery cell 2. In addition, since the strap 4 is elastic, it can provide a certain cushioning when the battery pack is bumped, preventing the battery cell 2 from shaking.

[0082] Furthermore, there are no restrictions on the connection method at both ends of the strap 4. It can be connected by a connecting buckle or by a fusion or other method, and the connection method can be flexibly selected.

[0083] In one possible implementation, the battery pack further includes end plates 6. The two ends of the battery cells 2 stacked along the second direction are respectively provided with end plates 6. The end plates 6 are engaged with the battery cells 2 at the ends by straps 4. The end plates 6 can prevent the battery cells 2 from directly contacting the inner wall of the housing 1, and can also improve the uniformity of force on the battery cells 2 located at the ends of the second direction, and prevent the straps 4 from being under excessive local pressure and damaging the battery cells 2.

[0084] Specifically, the battery pack also includes a heat insulation plate 10. In the battery cells 2 stacked along the second direction, a heat insulation plate 10 is provided between adjacent battery cells 2. The heat insulation plate 10 is an insulating component that plays the role of insulation and heat insulation.

[0085] The material and structure of the heat insulation board 10 are not limited. It can be a single-layer structure or a multi-layer structure, and it can be made of plastic, rubber, etc., as long as it can play a role in insulation and heat insulation.

[0086] Preferably, the heat insulation plate 10 is made of aerogel.

[0087] Furthermore, such as Figure 3 As shown, the battery pack also includes an insulating pad 9, which is laid between the bottom of the battery cell 2 and the housing 1 to prevent the battery cell 2 from directly contacting the housing 1. Preferably, the insulating pad 9 is bonded to the housing 1.

[0088] In addition, the battery pack also includes a cover 103, which is located on the top of the housing 1 and is used to close the housing space 101.

[0089] The following describes the procedure for replacing cell 2 in the battery pack of this embodiment:

[0090] Remove the cover 103; unlock the strap 4; remove the fastener 501 used to fix the cooling plate 5, so that the cooling plate 5 is unrestrained, and then remove the cooling plate 5; confirm the location of the faulty cell 2. Since the busbar assembly 3 is mechanically connected to the cell 2, the busbar assembly 3 on both sides of the cell 2 can be directly pulled out along the third direction. At this time, the high voltage is disconnected, and the faulty cell 2 is removed and replaced; the battery pack can be repackaged by reversing the above steps.

[0091] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: Container (1), multiple battery cells (2), busbar assembly (3); The box (1) has an internal storage space (101); At least two of the busbar assemblies (3) are spaced apart in the receiving space (101) along a first direction; Multiple battery cells (2) are stacked in the receiving space (101) along a second direction. The busbar assembly (3) is disposed at both ends of the battery cells (2) in a first direction. The busbar assembly (3) includes a busbar portion (301) and a support plate (302). The busbar portion (301) is disposed on the surface of the support plate (302) facing the battery cells (2). The battery cell (2) has terminals (201) at both ends along the first direction. The terminals (201) have bosses. The battery cell (2) is detachably connected to the support plate (302) through the bosses. The battery cell (2) is electrically connected to the busbar (301) through the terminals (201).

2. The battery pack according to claim 1, characterized in that, The support plate (302) extends along the second direction. The support plate (302) has a plurality of limiting grooves (3021) on the side near the battery cell (2). The plurality of limiting grooves (3021) are spaced apart along the second direction. The limiting grooves (3021) extend along the third direction and are used to be inserted and cooperate with the corresponding pole post (201). The busbar (301) is located between the pole post (201) and the support plate (302).

3. The battery pack according to claim 2, characterized in that, The busbar (301) includes multiple busbar components, each including a busbar (3011) and an elastic pad (3012). The elastic pad (3012) is located between the busbar (3011) and the support plate (302). The busbar (3011) abuts against the terminal (201) of the adjacent battery cell (2) through the elastic pad (3012).

4. The battery pack according to claim 3, characterized in that, The support plate (302) includes a plate body (3022) and a plurality of limiting components (3023). The plate body (3022) forms an assembly surface (3024) near the wall of the battery cell (2). The plurality of limiting components (3023) are spaced apart on the assembly surface (3024) along a second direction. At least one side of the limiting component (3023) in the second direction has a limiting groove (3021). The limiting groove (3021) is recessed in a direction away from the adjacent limiting component (3023). The pole post (201) engages with the limiting groove (3021) through its own boss.

5. The battery pack according to claim 4, characterized in that, The limiting component (3023) includes at least two limiting members (3025) spaced apart along a third direction; And / or, the mounting surface (3024) is provided with a busbar groove (3026) for mounting the busbar assembly.

6. The battery pack according to any one of claims 3 to 5, characterized in that, The busbar assembly (3) further includes a collection unit (303), which is disposed on one side of the support plate (302) near the battery cell (2) and extends along the second direction. The collection unit (303) is electrically connected to the busbar (301) and thermally connected to the battery cell (2).

7. The battery pack according to claim 6, characterized in that, The acquisition unit (303) includes a flexible circuit board (3031), a plurality of conductive elements (3032) and a plurality of heat-conducting elements (3033). The flexible circuit board (3031) is disposed on one side of the support plate (302) near the battery cell (2) and extends along a second direction. The conductive elements (3032) and the heat-conducting elements (3033) are spaced apart on the flexible circuit board (3031) along the second direction. The flexible circuit board (3031) is electrically connected to the corresponding busbar (3011) through the conductive elements (3032). The flexible circuit board (3031) is thermally connected to the corresponding battery cell (2) through the heat-conducting elements (3033).

8. The battery pack according to any one of claims 1 to 5, characterized in that, The battery pack also includes a strap (4) and a cooling plate (5). The cooling plate (5) is disposed on the top of the battery cell (2). The battery cell (2) is tied and fixed by the strap (4). The cooling plate (5) is located between the strap (4) and the battery cell (2). The cooling plate (5) abuts against the battery cell (2) through the strap (4).

9. The battery pack according to claim 8, characterized in that, The bottom surface of the box (1) is provided with a perforation (102), the perforation (102) extends along the second direction and communicates with the accommodating space (101), and the strap (4) is inserted through the perforation (102).

10. The battery pack according to claim 9, characterized in that, The battery pack also includes end plates (6), and the end plates (6) are respectively provided at both ends of the battery cells (2) stacked along the second direction. The end plates (6) are engaged with the battery cells (2) at the ends by the binding straps (4).

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